1 /*
2 * MPEG-4 decoder
3 * Copyright (c) 2000,2001 Fabrice Bellard
4 * Copyright (c) 2002-2010 Michael Niedermayer <michaelni@gmx.at>
5 *
6 * This file is part of FFmpeg.
7 *
8 * FFmpeg is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU Lesser General Public
10 * License as published by the Free Software Foundation; either
11 * version 2.1 of the License, or (at your option) any later version.
12 *
13 * FFmpeg is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 * Lesser General Public License for more details.
17 *
18 * You should have received a copy of the GNU Lesser General Public
19 * License along with FFmpeg; if not, write to the Free Software
20 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
21 */
22
23 #define UNCHECKED_BITSTREAM_READER 1
24
25 #include "config_components.h"
26
27 #include "libavutil/internal.h"
28 #include "libavutil/opt.h"
29 #include "libavutil/thread.h"
30 #include "codec_internal.h"
31 #include "error_resilience.h"
32 #include "hwconfig.h"
33 #include "idctdsp.h"
34 #include "mpegutils.h"
35 #include "mpegvideo.h"
36 #include "mpegvideodata.h"
37 #include "mpegvideodec.h"
38 #include "mpeg4video.h"
39 #include "mpeg4videodata.h"
40 #include "mpeg4videodec.h"
41 #include "h263.h"
42 #include "h263data.h"
43 #include "h263dec.h"
44 #include "profiles.h"
45 #include "threadframe.h"
46 #include "xvididct.h"
47 #include "unary.h"
48
49 /* The defines below define the number of bits that are read at once for
50 * reading vlc values. Changing these may improve speed and data cache needs
51 * be aware though that decreasing them may need the number of stages that is
52 * passed to get_vlc* to be increased. */
53 #define SPRITE_TRAJ_VLC_BITS 6
54 #define DC_VLC_BITS 9
55 #define MB_TYPE_B_VLC_BITS 4
56 #define STUDIO_INTRA_BITS 9
57
58 static VLC dc_lum, dc_chrom;
59 static VLC sprite_trajectory;
60 static VLC mb_type_b_vlc;
61 static VLC studio_intra_tab[12];
62 static VLC studio_luma_dc;
63 static VLC studio_chroma_dc;
64
65 static const uint8_t mpeg4_block_count[4] = { 0, 6, 8, 12 };
66
67 static const int mb_type_b_map[4] = {
68 MB_TYPE_DIRECT2 | MB_TYPE_L0L1,
69 MB_TYPE_L0L1 | MB_TYPE_16x16,
70 MB_TYPE_L1 | MB_TYPE_16x16,
71 MB_TYPE_L0 | MB_TYPE_16x16,
72 };
73
ff_mpeg4_decode_studio(MpegEncContext * s,uint8_t * dest_y,uint8_t * dest_cb,uint8_t * dest_cr,int block_size,int uvlinesize,int dct_linesize,int dct_offset)74 void ff_mpeg4_decode_studio(MpegEncContext *s, uint8_t *dest_y, uint8_t *dest_cb,
75 uint8_t *dest_cr, int block_size, int uvlinesize,
76 int dct_linesize, int dct_offset)
77 {
78 Mpeg4DecContext *const ctx = (Mpeg4DecContext*)s;
79 const int act_block_size = block_size * 2;
80
81 if (ctx->dpcm_direction == 0) {
82 s->idsp.idct_put(dest_y, dct_linesize, (int16_t*)ctx->block32[0]);
83 s->idsp.idct_put(dest_y + act_block_size, dct_linesize, (int16_t*)ctx->block32[1]);
84 s->idsp.idct_put(dest_y + dct_offset, dct_linesize, (int16_t*)ctx->block32[2]);
85 s->idsp.idct_put(dest_y + dct_offset + act_block_size, dct_linesize, (int16_t*)ctx->block32[3]);
86
87 dct_linesize = uvlinesize << s->interlaced_dct;
88 dct_offset = s->interlaced_dct ? uvlinesize : uvlinesize*block_size;
89
90 s->idsp.idct_put(dest_cb, dct_linesize, (int16_t*)ctx->block32[4]);
91 s->idsp.idct_put(dest_cr, dct_linesize, (int16_t*)ctx->block32[5]);
92 s->idsp.idct_put(dest_cb + dct_offset, dct_linesize, (int16_t*)ctx->block32[6]);
93 s->idsp.idct_put(dest_cr + dct_offset, dct_linesize, (int16_t*)ctx->block32[7]);
94 if (!s->chroma_x_shift){ //Chroma444
95 s->idsp.idct_put(dest_cb + act_block_size, dct_linesize, (int16_t*)ctx->block32[8]);
96 s->idsp.idct_put(dest_cr + act_block_size, dct_linesize, (int16_t*)ctx->block32[9]);
97 s->idsp.idct_put(dest_cb + act_block_size + dct_offset, dct_linesize, (int16_t*)ctx->block32[10]);
98 s->idsp.idct_put(dest_cr + act_block_size + dct_offset, dct_linesize, (int16_t*)ctx->block32[11]);
99 }
100 } else if (ctx->dpcm_direction == 1) {
101 uint16_t *dest_pcm[3] = {(uint16_t*)dest_y, (uint16_t*)dest_cb, (uint16_t*)dest_cr};
102 int linesize[3] = {dct_linesize, uvlinesize, uvlinesize};
103 for (int i = 0; i < 3; i++) {
104 const uint16_t *src = ctx->dpcm_macroblock[i];
105 int vsub = i ? s->chroma_y_shift : 0;
106 int hsub = i ? s->chroma_x_shift : 0;
107 int lowres = s->avctx->lowres;
108 int step = 1 << lowres;
109 for (int h = 0; h < (16 >> (vsub + lowres)); h++){
110 for (int w = 0, idx = 0; w < (16 >> (hsub + lowres)); w++, idx += step)
111 dest_pcm[i][w] = src[idx];
112 dest_pcm[i] += linesize[i] / 2;
113 src += (16 >> hsub) * step;
114 }
115 }
116 } else {
117 uint16_t *dest_pcm[3] = {(uint16_t*)dest_y, (uint16_t*)dest_cb, (uint16_t*)dest_cr};
118 int linesize[3] = {dct_linesize, uvlinesize, uvlinesize};
119 av_assert2(ctx->dpcm_direction == -1);
120 for (int i = 0; i < 3; i++) {
121 const uint16_t *src = ctx->dpcm_macroblock[i];
122 int vsub = i ? s->chroma_y_shift : 0;
123 int hsub = i ? s->chroma_x_shift : 0;
124 int lowres = s->avctx->lowres;
125 int step = 1 << lowres;
126 dest_pcm[i] += (linesize[i] / 2) * ((16 >> vsub + lowres) - 1);
127 for (int h = (16 >> (vsub + lowres)) - 1; h >= 0; h--){
128 for (int w = (16 >> (hsub + lowres)) - 1, idx = 0; w >= 0; w--, idx += step)
129 dest_pcm[i][w] = src[idx];
130 src += step * (16 >> hsub);
131 dest_pcm[i] -= linesize[i] / 2;
132 }
133 }
134 }
135 }
136
137 /**
138 * Predict the ac.
139 * @param n block index (0-3 are luma, 4-5 are chroma)
140 * @param dir the ac prediction direction
141 */
ff_mpeg4_pred_ac(MpegEncContext * s,int16_t * block,int n,int dir)142 void ff_mpeg4_pred_ac(MpegEncContext *s, int16_t *block, int n, int dir)
143 {
144 int i;
145 int16_t *ac_val, *ac_val1;
146 int8_t *const qscale_table = s->current_picture.qscale_table;
147
148 /* find prediction */
149 ac_val = &s->ac_val[0][0][0] + s->block_index[n] * 16;
150 ac_val1 = ac_val;
151 if (s->ac_pred) {
152 if (dir == 0) {
153 const int xy = s->mb_x - 1 + s->mb_y * s->mb_stride;
154 /* left prediction */
155 ac_val -= 16;
156
157 if (s->mb_x == 0 || s->qscale == qscale_table[xy] ||
158 n == 1 || n == 3) {
159 /* same qscale */
160 for (i = 1; i < 8; i++)
161 block[s->idsp.idct_permutation[i << 3]] += ac_val[i];
162 } else {
163 /* different qscale, we must rescale */
164 for (i = 1; i < 8; i++)
165 block[s->idsp.idct_permutation[i << 3]] += ROUNDED_DIV(ac_val[i] * qscale_table[xy], s->qscale);
166 }
167 } else {
168 const int xy = s->mb_x + s->mb_y * s->mb_stride - s->mb_stride;
169 /* top prediction */
170 ac_val -= 16 * s->block_wrap[n];
171
172 if (s->mb_y == 0 || s->qscale == qscale_table[xy] ||
173 n == 2 || n == 3) {
174 /* same qscale */
175 for (i = 1; i < 8; i++)
176 block[s->idsp.idct_permutation[i]] += ac_val[i + 8];
177 } else {
178 /* different qscale, we must rescale */
179 for (i = 1; i < 8; i++)
180 block[s->idsp.idct_permutation[i]] += ROUNDED_DIV(ac_val[i + 8] * qscale_table[xy], s->qscale);
181 }
182 }
183 }
184 /* left copy */
185 for (i = 1; i < 8; i++)
186 ac_val1[i] = block[s->idsp.idct_permutation[i << 3]];
187
188 /* top copy */
189 for (i = 1; i < 8; i++)
190 ac_val1[8 + i] = block[s->idsp.idct_permutation[i]];
191 }
192
193 /**
194 * check if the next stuff is a resync marker or the end.
195 * @return 0 if not
196 */
mpeg4_is_resync(Mpeg4DecContext * ctx)197 static inline int mpeg4_is_resync(Mpeg4DecContext *ctx)
198 {
199 MpegEncContext *s = &ctx->m;
200 int bits_count = get_bits_count(&s->gb);
201 int v = show_bits(&s->gb, 16);
202
203 if (s->workaround_bugs & FF_BUG_NO_PADDING && !ctx->resync_marker)
204 return 0;
205
206 while (v <= 0xFF) {
207 if (s->pict_type == AV_PICTURE_TYPE_B ||
208 (v >> (8 - s->pict_type) != 1) || s->partitioned_frame)
209 break;
210 skip_bits(&s->gb, 8 + s->pict_type);
211 bits_count += 8 + s->pict_type;
212 v = show_bits(&s->gb, 16);
213 }
214
215 if (bits_count + 8 >= s->gb.size_in_bits) {
216 v >>= 8;
217 v |= 0x7F >> (7 - (bits_count & 7));
218
219 if (v == 0x7F)
220 return s->mb_num;
221 } else {
222 if (v == ff_mpeg4_resync_prefix[bits_count & 7]) {
223 int len, mb_num;
224 int mb_num_bits = av_log2(s->mb_num - 1) + 1;
225 GetBitContext gb = s->gb;
226
227 skip_bits(&s->gb, 1);
228 align_get_bits(&s->gb);
229
230 for (len = 0; len < 32; len++)
231 if (get_bits1(&s->gb))
232 break;
233
234 mb_num = get_bits(&s->gb, mb_num_bits);
235 if (!mb_num || mb_num > s->mb_num || get_bits_count(&s->gb)+6 > s->gb.size_in_bits)
236 mb_num= -1;
237
238 s->gb = gb;
239
240 if (len >= ff_mpeg4_get_video_packet_prefix_length(s))
241 return mb_num;
242 }
243 }
244 return 0;
245 }
246
mpeg4_decode_sprite_trajectory(Mpeg4DecContext * ctx,GetBitContext * gb)247 static int mpeg4_decode_sprite_trajectory(Mpeg4DecContext *ctx, GetBitContext *gb)
248 {
249 MpegEncContext *s = &ctx->m;
250 int a = 2 << s->sprite_warping_accuracy;
251 int rho = 3 - s->sprite_warping_accuracy;
252 int r = 16 / a;
253 int alpha = 1;
254 int beta = 0;
255 int w = s->width;
256 int h = s->height;
257 int min_ab, i, w2, h2, w3, h3;
258 int sprite_ref[4][2];
259 int virtual_ref[2][2];
260 int64_t sprite_offset[2][2];
261 int64_t sprite_delta[2][2];
262
263 // only true for rectangle shapes
264 const int vop_ref[4][2] = { { 0, 0 }, { s->width, 0 },
265 { 0, s->height }, { s->width, s->height } };
266 int d[4][2] = { { 0, 0 }, { 0, 0 }, { 0, 0 }, { 0, 0 } };
267
268 if (w <= 0 || h <= 0)
269 return AVERROR_INVALIDDATA;
270
271 for (i = 0; i < ctx->num_sprite_warping_points; i++) {
272 int length;
273 int x = 0, y = 0;
274
275 length = get_vlc2(gb, sprite_trajectory.table, SPRITE_TRAJ_VLC_BITS, 2);
276 if (length > 0)
277 x = get_xbits(gb, length);
278
279 if (!(ctx->divx_version == 500 && ctx->divx_build == 413))
280 check_marker(s->avctx, gb, "before sprite_trajectory");
281
282 length = get_vlc2(gb, sprite_trajectory.table, SPRITE_TRAJ_VLC_BITS, 2);
283 if (length > 0)
284 y = get_xbits(gb, length);
285
286 check_marker(s->avctx, gb, "after sprite_trajectory");
287 ctx->sprite_traj[i][0] = d[i][0] = x;
288 ctx->sprite_traj[i][1] = d[i][1] = y;
289 }
290 for (; i < 4; i++)
291 ctx->sprite_traj[i][0] = ctx->sprite_traj[i][1] = 0;
292
293 while ((1 << alpha) < w)
294 alpha++;
295 while ((1 << beta) < h)
296 beta++; /* typo in the MPEG-4 std for the definition of w' and h' */
297 w2 = 1 << alpha;
298 h2 = 1 << beta;
299
300 // Note, the 4th point isn't used for GMC
301 if (ctx->divx_version == 500 && ctx->divx_build == 413) {
302 sprite_ref[0][0] = a * vop_ref[0][0] + d[0][0];
303 sprite_ref[0][1] = a * vop_ref[0][1] + d[0][1];
304 sprite_ref[1][0] = a * vop_ref[1][0] + d[0][0] + d[1][0];
305 sprite_ref[1][1] = a * vop_ref[1][1] + d[0][1] + d[1][1];
306 sprite_ref[2][0] = a * vop_ref[2][0] + d[0][0] + d[2][0];
307 sprite_ref[2][1] = a * vop_ref[2][1] + d[0][1] + d[2][1];
308 } else {
309 sprite_ref[0][0] = (a >> 1) * (2 * vop_ref[0][0] + d[0][0]);
310 sprite_ref[0][1] = (a >> 1) * (2 * vop_ref[0][1] + d[0][1]);
311 sprite_ref[1][0] = (a >> 1) * (2 * vop_ref[1][0] + d[0][0] + d[1][0]);
312 sprite_ref[1][1] = (a >> 1) * (2 * vop_ref[1][1] + d[0][1] + d[1][1]);
313 sprite_ref[2][0] = (a >> 1) * (2 * vop_ref[2][0] + d[0][0] + d[2][0]);
314 sprite_ref[2][1] = (a >> 1) * (2 * vop_ref[2][1] + d[0][1] + d[2][1]);
315 }
316 /* sprite_ref[3][0] = (a >> 1) * (2 * vop_ref[3][0] + d[0][0] + d[1][0] + d[2][0] + d[3][0]);
317 * sprite_ref[3][1] = (a >> 1) * (2 * vop_ref[3][1] + d[0][1] + d[1][1] + d[2][1] + d[3][1]); */
318
319 /* This is mostly identical to the MPEG-4 std (and is totally unreadable
320 * because of that...). Perhaps it should be reordered to be more readable.
321 * The idea behind this virtual_ref mess is to be able to use shifts later
322 * per pixel instead of divides so the distance between points is converted
323 * from w&h based to w2&h2 based which are of the 2^x form. */
324 virtual_ref[0][0] = 16 * (vop_ref[0][0] + w2) +
325 ROUNDED_DIV(((w - w2) *
326 (r * sprite_ref[0][0] - 16LL * vop_ref[0][0]) +
327 w2 * (r * sprite_ref[1][0] - 16LL * vop_ref[1][0])), w);
328 virtual_ref[0][1] = 16 * vop_ref[0][1] +
329 ROUNDED_DIV(((w - w2) *
330 (r * sprite_ref[0][1] - 16LL * vop_ref[0][1]) +
331 w2 * (r * sprite_ref[1][1] - 16LL * vop_ref[1][1])), w);
332 virtual_ref[1][0] = 16 * vop_ref[0][0] +
333 ROUNDED_DIV(((h - h2) * (r * sprite_ref[0][0] - 16LL * vop_ref[0][0]) +
334 h2 * (r * sprite_ref[2][0] - 16LL * vop_ref[2][0])), h);
335 virtual_ref[1][1] = 16 * (vop_ref[0][1] + h2) +
336 ROUNDED_DIV(((h - h2) * (r * sprite_ref[0][1] - 16LL * vop_ref[0][1]) +
337 h2 * (r * sprite_ref[2][1] - 16LL * vop_ref[2][1])), h);
338
339 switch (ctx->num_sprite_warping_points) {
340 case 0:
341 sprite_offset[0][0] =
342 sprite_offset[0][1] =
343 sprite_offset[1][0] =
344 sprite_offset[1][1] = 0;
345 sprite_delta[0][0] = a;
346 sprite_delta[0][1] =
347 sprite_delta[1][0] = 0;
348 sprite_delta[1][1] = a;
349 ctx->sprite_shift[0] =
350 ctx->sprite_shift[1] = 0;
351 break;
352 case 1: // GMC only
353 sprite_offset[0][0] = sprite_ref[0][0] - a * vop_ref[0][0];
354 sprite_offset[0][1] = sprite_ref[0][1] - a * vop_ref[0][1];
355 sprite_offset[1][0] = ((sprite_ref[0][0] >> 1) | (sprite_ref[0][0] & 1)) -
356 a * (vop_ref[0][0] / 2);
357 sprite_offset[1][1] = ((sprite_ref[0][1] >> 1) | (sprite_ref[0][1] & 1)) -
358 a * (vop_ref[0][1] / 2);
359 sprite_delta[0][0] = a;
360 sprite_delta[0][1] =
361 sprite_delta[1][0] = 0;
362 sprite_delta[1][1] = a;
363 ctx->sprite_shift[0] =
364 ctx->sprite_shift[1] = 0;
365 break;
366 case 2:
367 sprite_offset[0][0] = ((int64_t) sprite_ref[0][0] * (1 << alpha + rho)) +
368 ((int64_t) -r * sprite_ref[0][0] + virtual_ref[0][0]) *
369 ((int64_t) -vop_ref[0][0]) +
370 ((int64_t) r * sprite_ref[0][1] - virtual_ref[0][1]) *
371 ((int64_t) -vop_ref[0][1]) + (1 << (alpha + rho - 1));
372 sprite_offset[0][1] = ((int64_t) sprite_ref[0][1] * (1 << alpha + rho)) +
373 ((int64_t) -r * sprite_ref[0][1] + virtual_ref[0][1]) *
374 ((int64_t) -vop_ref[0][0]) +
375 ((int64_t) -r * sprite_ref[0][0] + virtual_ref[0][0]) *
376 ((int64_t) -vop_ref[0][1]) + (1 << (alpha + rho - 1));
377 sprite_offset[1][0] = (((int64_t)-r * sprite_ref[0][0] + virtual_ref[0][0]) *
378 ((int64_t)-2 * vop_ref[0][0] + 1) +
379 ((int64_t) r * sprite_ref[0][1] - virtual_ref[0][1]) *
380 ((int64_t)-2 * vop_ref[0][1] + 1) + 2 * w2 * r *
381 (int64_t) sprite_ref[0][0] - 16 * w2 + (1 << (alpha + rho + 1)));
382 sprite_offset[1][1] = (((int64_t)-r * sprite_ref[0][1] + virtual_ref[0][1]) *
383 ((int64_t)-2 * vop_ref[0][0] + 1) +
384 ((int64_t)-r * sprite_ref[0][0] + virtual_ref[0][0]) *
385 ((int64_t)-2 * vop_ref[0][1] + 1) + 2 * w2 * r *
386 (int64_t) sprite_ref[0][1] - 16 * w2 + (1 << (alpha + rho + 1)));
387 sprite_delta[0][0] = (-r * sprite_ref[0][0] + virtual_ref[0][0]);
388 sprite_delta[0][1] = (+r * sprite_ref[0][1] - virtual_ref[0][1]);
389 sprite_delta[1][0] = (-r * sprite_ref[0][1] + virtual_ref[0][1]);
390 sprite_delta[1][1] = (-r * sprite_ref[0][0] + virtual_ref[0][0]);
391
392 ctx->sprite_shift[0] = alpha + rho;
393 ctx->sprite_shift[1] = alpha + rho + 2;
394 break;
395 case 3:
396 min_ab = FFMIN(alpha, beta);
397 w3 = w2 >> min_ab;
398 h3 = h2 >> min_ab;
399 sprite_offset[0][0] = ((int64_t)sprite_ref[0][0] * (1 << (alpha + beta + rho - min_ab))) +
400 ((int64_t)-r * sprite_ref[0][0] + virtual_ref[0][0]) * h3 * (-vop_ref[0][0]) +
401 ((int64_t)-r * sprite_ref[0][0] + virtual_ref[1][0]) * w3 * (-vop_ref[0][1]) +
402 ((int64_t)1 << (alpha + beta + rho - min_ab - 1));
403 sprite_offset[0][1] = ((int64_t)sprite_ref[0][1] * (1 << (alpha + beta + rho - min_ab))) +
404 ((int64_t)-r * sprite_ref[0][1] + virtual_ref[0][1]) * h3 * (-vop_ref[0][0]) +
405 ((int64_t)-r * sprite_ref[0][1] + virtual_ref[1][1]) * w3 * (-vop_ref[0][1]) +
406 ((int64_t)1 << (alpha + beta + rho - min_ab - 1));
407 sprite_offset[1][0] = ((int64_t)-r * sprite_ref[0][0] + virtual_ref[0][0]) * h3 * (-2 * vop_ref[0][0] + 1) +
408 ((int64_t)-r * sprite_ref[0][0] + virtual_ref[1][0]) * w3 * (-2 * vop_ref[0][1] + 1) +
409 (int64_t)2 * w2 * h3 * r * sprite_ref[0][0] - 16 * w2 * h3 +
410 ((int64_t)1 << (alpha + beta + rho - min_ab + 1));
411 sprite_offset[1][1] = ((int64_t)-r * sprite_ref[0][1] + virtual_ref[0][1]) * h3 * (-2 * vop_ref[0][0] + 1) +
412 ((int64_t)-r * sprite_ref[0][1] + virtual_ref[1][1]) * w3 * (-2 * vop_ref[0][1] + 1) +
413 (int64_t)2 * w2 * h3 * r * sprite_ref[0][1] - 16 * w2 * h3 +
414 ((int64_t)1 << (alpha + beta + rho - min_ab + 1));
415 sprite_delta[0][0] = (-r * (int64_t)sprite_ref[0][0] + virtual_ref[0][0]) * h3;
416 sprite_delta[0][1] = (-r * (int64_t)sprite_ref[0][0] + virtual_ref[1][0]) * w3;
417 sprite_delta[1][0] = (-r * (int64_t)sprite_ref[0][1] + virtual_ref[0][1]) * h3;
418 sprite_delta[1][1] = (-r * (int64_t)sprite_ref[0][1] + virtual_ref[1][1]) * w3;
419
420 ctx->sprite_shift[0] = alpha + beta + rho - min_ab;
421 ctx->sprite_shift[1] = alpha + beta + rho - min_ab + 2;
422 break;
423 }
424 /* try to simplify the situation */
425 if (sprite_delta[0][0] == a << ctx->sprite_shift[0] &&
426 sprite_delta[0][1] == 0 &&
427 sprite_delta[1][0] == 0 &&
428 sprite_delta[1][1] == a << ctx->sprite_shift[0]) {
429 sprite_offset[0][0] >>= ctx->sprite_shift[0];
430 sprite_offset[0][1] >>= ctx->sprite_shift[0];
431 sprite_offset[1][0] >>= ctx->sprite_shift[1];
432 sprite_offset[1][1] >>= ctx->sprite_shift[1];
433 sprite_delta[0][0] = a;
434 sprite_delta[0][1] = 0;
435 sprite_delta[1][0] = 0;
436 sprite_delta[1][1] = a;
437 ctx->sprite_shift[0] = 0;
438 ctx->sprite_shift[1] = 0;
439 s->real_sprite_warping_points = 1;
440 } else {
441 int shift_y = 16 - ctx->sprite_shift[0];
442 int shift_c = 16 - ctx->sprite_shift[1];
443
444 for (i = 0; i < 2; i++) {
445 if (shift_c < 0 || shift_y < 0 ||
446 FFABS( sprite_offset[0][i]) >= INT_MAX >> shift_y ||
447 FFABS( sprite_offset[1][i]) >= INT_MAX >> shift_c ||
448 FFABS( sprite_delta[0][i]) >= INT_MAX >> shift_y ||
449 FFABS( sprite_delta[1][i]) >= INT_MAX >> shift_y
450 ) {
451 avpriv_request_sample(s->avctx, "Too large sprite shift, delta or offset");
452 goto overflow;
453 }
454 }
455
456 for (i = 0; i < 2; i++) {
457 sprite_offset[0][i] *= 1 << shift_y;
458 sprite_offset[1][i] *= 1 << shift_c;
459 sprite_delta[0][i] *= 1 << shift_y;
460 sprite_delta[1][i] *= 1 << shift_y;
461 ctx->sprite_shift[i] = 16;
462
463 }
464 for (i = 0; i < 2; i++) {
465 int64_t sd[2] = {
466 sprite_delta[i][0] - a * (1LL<<16),
467 sprite_delta[i][1] - a * (1LL<<16)
468 };
469
470 if (llabs(sprite_offset[0][i] + sprite_delta[i][0] * (w+16LL)) >= INT_MAX ||
471 llabs(sprite_offset[0][i] + sprite_delta[i][1] * (h+16LL)) >= INT_MAX ||
472 llabs(sprite_offset[0][i] + sprite_delta[i][0] * (w+16LL) + sprite_delta[i][1] * (h+16LL)) >= INT_MAX ||
473 llabs(sprite_delta[i][0] * (w+16LL)) >= INT_MAX ||
474 llabs(sprite_delta[i][1] * (h+16LL)) >= INT_MAX ||
475 llabs(sd[0]) >= INT_MAX ||
476 llabs(sd[1]) >= INT_MAX ||
477 llabs(sprite_offset[0][i] + sd[0] * (w+16LL)) >= INT_MAX ||
478 llabs(sprite_offset[0][i] + sd[1] * (h+16LL)) >= INT_MAX ||
479 llabs(sprite_offset[0][i] + sd[0] * (w+16LL) + sd[1] * (h+16LL)) >= INT_MAX
480 ) {
481 avpriv_request_sample(s->avctx, "Overflow on sprite points");
482 goto overflow;
483 }
484 }
485 s->real_sprite_warping_points = ctx->num_sprite_warping_points;
486 }
487
488 for (i = 0; i < 4; i++) {
489 s->sprite_offset[i&1][i>>1] = sprite_offset[i&1][i>>1];
490 s->sprite_delta [i&1][i>>1] = sprite_delta [i&1][i>>1];
491 }
492
493 return 0;
494 overflow:
495 memset(s->sprite_offset, 0, sizeof(s->sprite_offset));
496 memset(s->sprite_delta, 0, sizeof(s->sprite_delta));
497 return AVERROR_PATCHWELCOME;
498 }
499
decode_new_pred(Mpeg4DecContext * ctx,GetBitContext * gb)500 static int decode_new_pred(Mpeg4DecContext *ctx, GetBitContext *gb) {
501 MpegEncContext *s = &ctx->m;
502 int len = FFMIN(ctx->time_increment_bits + 3, 15);
503
504 get_bits(gb, len);
505 if (get_bits1(gb))
506 get_bits(gb, len);
507 check_marker(s->avctx, gb, "after new_pred");
508
509 return 0;
510 }
511
512 /**
513 * Decode the next video packet.
514 * @return <0 if something went wrong
515 */
ff_mpeg4_decode_video_packet_header(Mpeg4DecContext * ctx)516 int ff_mpeg4_decode_video_packet_header(Mpeg4DecContext *ctx)
517 {
518 MpegEncContext *s = &ctx->m;
519
520 int mb_num_bits = av_log2(s->mb_num - 1) + 1;
521 int header_extension = 0, mb_num, len;
522
523 /* is there enough space left for a video packet + header */
524 if (get_bits_count(&s->gb) > s->gb.size_in_bits - 20)
525 return AVERROR_INVALIDDATA;
526
527 for (len = 0; len < 32; len++)
528 if (get_bits1(&s->gb))
529 break;
530
531 if (len != ff_mpeg4_get_video_packet_prefix_length(s)) {
532 av_log(s->avctx, AV_LOG_ERROR, "marker does not match f_code\n");
533 return AVERROR_INVALIDDATA;
534 }
535
536 if (ctx->shape != RECT_SHAPE) {
537 header_extension = get_bits1(&s->gb);
538 // FIXME more stuff here
539 }
540
541 mb_num = get_bits(&s->gb, mb_num_bits);
542 if (mb_num >= s->mb_num || !mb_num) {
543 av_log(s->avctx, AV_LOG_ERROR,
544 "illegal mb_num in video packet (%d %d) \n", mb_num, s->mb_num);
545 return AVERROR_INVALIDDATA;
546 }
547
548 s->mb_x = mb_num % s->mb_width;
549 s->mb_y = mb_num / s->mb_width;
550
551 if (ctx->shape != BIN_ONLY_SHAPE) {
552 int qscale = get_bits(&s->gb, s->quant_precision);
553 if (qscale)
554 s->chroma_qscale = s->qscale = qscale;
555 }
556
557 if (ctx->shape == RECT_SHAPE)
558 header_extension = get_bits1(&s->gb);
559
560 if (header_extension) {
561 int time_incr = 0;
562
563 while (get_bits1(&s->gb) != 0)
564 time_incr++;
565
566 check_marker(s->avctx, &s->gb, "before time_increment in video packed header");
567 skip_bits(&s->gb, ctx->time_increment_bits); /* time_increment */
568 check_marker(s->avctx, &s->gb, "before vop_coding_type in video packed header");
569
570 skip_bits(&s->gb, 2); /* vop coding type */
571 // FIXME not rect stuff here
572
573 if (ctx->shape != BIN_ONLY_SHAPE) {
574 skip_bits(&s->gb, 3); /* intra dc vlc threshold */
575 // FIXME don't just ignore everything
576 if (s->pict_type == AV_PICTURE_TYPE_S &&
577 ctx->vol_sprite_usage == GMC_SPRITE) {
578 if (mpeg4_decode_sprite_trajectory(ctx, &s->gb) < 0)
579 return AVERROR_INVALIDDATA;
580 av_log(s->avctx, AV_LOG_ERROR, "untested\n");
581 }
582
583 // FIXME reduced res stuff here
584
585 if (s->pict_type != AV_PICTURE_TYPE_I) {
586 int f_code = get_bits(&s->gb, 3); /* fcode_for */
587 if (f_code == 0)
588 av_log(s->avctx, AV_LOG_ERROR,
589 "Error, video packet header damaged (f_code=0)\n");
590 }
591 if (s->pict_type == AV_PICTURE_TYPE_B) {
592 int b_code = get_bits(&s->gb, 3);
593 if (b_code == 0)
594 av_log(s->avctx, AV_LOG_ERROR,
595 "Error, video packet header damaged (b_code=0)\n");
596 }
597 }
598 }
599 if (ctx->new_pred)
600 decode_new_pred(ctx, &s->gb);
601
602 return 0;
603 }
604
reset_studio_dc_predictors(MpegEncContext * s)605 static void reset_studio_dc_predictors(MpegEncContext *s)
606 {
607 /* Reset DC Predictors */
608 s->last_dc[0] =
609 s->last_dc[1] =
610 s->last_dc[2] = 1 << (s->avctx->bits_per_raw_sample + s->dct_precision + s->intra_dc_precision - 1);
611 }
612
613 /**
614 * Decode the next video packet.
615 * @return <0 if something went wrong
616 */
ff_mpeg4_decode_studio_slice_header(Mpeg4DecContext * ctx)617 int ff_mpeg4_decode_studio_slice_header(Mpeg4DecContext *ctx)
618 {
619 MpegEncContext *s = &ctx->m;
620 GetBitContext *gb = &s->gb;
621 unsigned vlc_len;
622 uint16_t mb_num;
623
624 if (get_bits_left(gb) >= 32 && get_bits_long(gb, 32) == SLICE_STARTCODE) {
625 vlc_len = av_log2(s->mb_width * s->mb_height) + 1;
626 mb_num = get_bits(gb, vlc_len);
627
628 if (mb_num >= s->mb_num)
629 return AVERROR_INVALIDDATA;
630
631 s->mb_x = mb_num % s->mb_width;
632 s->mb_y = mb_num / s->mb_width;
633
634 if (ctx->shape != BIN_ONLY_SHAPE)
635 s->qscale = mpeg_get_qscale(s);
636
637 if (get_bits1(gb)) { /* slice_extension_flag */
638 skip_bits1(gb); /* intra_slice */
639 skip_bits1(gb); /* slice_VOP_id_enable */
640 skip_bits(gb, 6); /* slice_VOP_id */
641 while (get_bits1(gb)) /* extra_bit_slice */
642 skip_bits(gb, 8); /* extra_information_slice */
643 }
644
645 reset_studio_dc_predictors(s);
646 }
647 else {
648 return AVERROR_INVALIDDATA;
649 }
650
651 return 0;
652 }
653
654 /**
655 * Get the average motion vector for a GMC MB.
656 * @param n either 0 for the x component or 1 for y
657 * @return the average MV for a GMC MB
658 */
get_amv(Mpeg4DecContext * ctx,int n)659 static inline int get_amv(Mpeg4DecContext *ctx, int n)
660 {
661 MpegEncContext *s = &ctx->m;
662 int x, y, mb_v, sum, dx, dy, shift;
663 int len = 1 << (s->f_code + 4);
664 const int a = s->sprite_warping_accuracy;
665
666 if (s->workaround_bugs & FF_BUG_AMV)
667 len >>= s->quarter_sample;
668
669 if (s->real_sprite_warping_points == 1) {
670 if (ctx->divx_version == 500 && ctx->divx_build == 413 && a >= s->quarter_sample)
671 sum = s->sprite_offset[0][n] / (1 << (a - s->quarter_sample));
672 else
673 sum = RSHIFT(s->sprite_offset[0][n] * (1 << s->quarter_sample), a);
674 } else {
675 dx = s->sprite_delta[n][0];
676 dy = s->sprite_delta[n][1];
677 shift = ctx->sprite_shift[0];
678 if (n)
679 dy -= 1 << (shift + a + 1);
680 else
681 dx -= 1 << (shift + a + 1);
682 mb_v = s->sprite_offset[0][n] + dx * s->mb_x * 16U + dy * s->mb_y * 16U;
683
684 sum = 0;
685 for (y = 0; y < 16; y++) {
686 int v;
687
688 v = mb_v + (unsigned)dy * y;
689 // FIXME optimize
690 for (x = 0; x < 16; x++) {
691 sum += v >> shift;
692 v += dx;
693 }
694 }
695 sum = RSHIFT(sum, a + 8 - s->quarter_sample);
696 }
697
698 if (sum < -len)
699 sum = -len;
700 else if (sum >= len)
701 sum = len - 1;
702
703 return sum;
704 }
705
706 /**
707 * Decode the dc value.
708 * @param n block index (0-3 are luma, 4-5 are chroma)
709 * @param dir_ptr the prediction direction will be stored here
710 * @return the quantized dc
711 */
mpeg4_decode_dc(MpegEncContext * s,int n,int * dir_ptr)712 static inline int mpeg4_decode_dc(MpegEncContext *s, int n, int *dir_ptr)
713 {
714 int level, code;
715
716 if (n < 4)
717 code = get_vlc2(&s->gb, dc_lum.table, DC_VLC_BITS, 1);
718 else
719 code = get_vlc2(&s->gb, dc_chrom.table, DC_VLC_BITS, 1);
720
721 if (code < 0 || code > 9 /* && s->nbit < 9 */) {
722 av_log(s->avctx, AV_LOG_ERROR, "illegal dc vlc\n");
723 return AVERROR_INVALIDDATA;
724 }
725
726 if (code == 0) {
727 level = 0;
728 } else {
729 if (IS_3IV1) {
730 if (code == 1)
731 level = 2 * get_bits1(&s->gb) - 1;
732 else {
733 if (get_bits1(&s->gb))
734 level = get_bits(&s->gb, code - 1) + (1 << (code - 1));
735 else
736 level = -get_bits(&s->gb, code - 1) - (1 << (code - 1));
737 }
738 } else {
739 level = get_xbits(&s->gb, code);
740 }
741
742 if (code > 8) {
743 if (get_bits1(&s->gb) == 0) { /* marker */
744 if (s->avctx->err_recognition & (AV_EF_BITSTREAM|AV_EF_COMPLIANT)) {
745 av_log(s->avctx, AV_LOG_ERROR, "dc marker bit missing\n");
746 return AVERROR_INVALIDDATA;
747 }
748 }
749 }
750 }
751
752 return ff_mpeg4_pred_dc(s, n, level, dir_ptr, 0);
753 }
754
755 /**
756 * Decode first partition.
757 * @return number of MBs decoded or <0 if an error occurred
758 */
mpeg4_decode_partition_a(Mpeg4DecContext * ctx)759 static int mpeg4_decode_partition_a(Mpeg4DecContext *ctx)
760 {
761 MpegEncContext *s = &ctx->m;
762 int mb_num = 0;
763 static const int8_t quant_tab[4] = { -1, -2, 1, 2 };
764
765 /* decode first partition */
766 s->first_slice_line = 1;
767 for (; s->mb_y < s->mb_height; s->mb_y++) {
768 ff_init_block_index(s);
769 for (; s->mb_x < s->mb_width; s->mb_x++) {
770 const int xy = s->mb_x + s->mb_y * s->mb_stride;
771 int cbpc;
772 int dir = 0;
773
774 mb_num++;
775 ff_update_block_index(s);
776 if (s->mb_x == s->resync_mb_x && s->mb_y == s->resync_mb_y + 1)
777 s->first_slice_line = 0;
778
779 if (s->pict_type == AV_PICTURE_TYPE_I) {
780 int i;
781
782 do {
783 if (show_bits(&s->gb, 19) == DC_MARKER)
784 return mb_num - 1;
785
786 cbpc = get_vlc2(&s->gb, ff_h263_intra_MCBPC_vlc.table, INTRA_MCBPC_VLC_BITS, 2);
787 if (cbpc < 0) {
788 av_log(s->avctx, AV_LOG_ERROR,
789 "mcbpc corrupted at %d %d\n", s->mb_x, s->mb_y);
790 return AVERROR_INVALIDDATA;
791 }
792 } while (cbpc == 8);
793
794 s->cbp_table[xy] = cbpc & 3;
795 s->current_picture.mb_type[xy] = MB_TYPE_INTRA;
796 s->mb_intra = 1;
797
798 if (cbpc & 4)
799 ff_set_qscale(s, s->qscale + quant_tab[get_bits(&s->gb, 2)]);
800
801 s->current_picture.qscale_table[xy] = s->qscale;
802
803 s->mbintra_table[xy] = 1;
804 for (i = 0; i < 6; i++) {
805 int dc_pred_dir;
806 int dc = mpeg4_decode_dc(s, i, &dc_pred_dir);
807 if (dc < 0) {
808 av_log(s->avctx, AV_LOG_ERROR,
809 "DC corrupted at %d %d\n", s->mb_x, s->mb_y);
810 return dc;
811 }
812 dir <<= 1;
813 if (dc_pred_dir)
814 dir |= 1;
815 }
816 s->pred_dir_table[xy] = dir;
817 } else { /* P/S_TYPE */
818 int mx, my, pred_x, pred_y, bits;
819 int16_t *const mot_val = s->current_picture.motion_val[0][s->block_index[0]];
820 const int stride = s->b8_stride * 2;
821
822 try_again:
823 bits = show_bits(&s->gb, 17);
824 if (bits == MOTION_MARKER)
825 return mb_num - 1;
826
827 skip_bits1(&s->gb);
828 if (bits & 0x10000) {
829 /* skip mb */
830 if (s->pict_type == AV_PICTURE_TYPE_S &&
831 ctx->vol_sprite_usage == GMC_SPRITE) {
832 s->current_picture.mb_type[xy] = MB_TYPE_SKIP |
833 MB_TYPE_16x16 |
834 MB_TYPE_GMC |
835 MB_TYPE_L0;
836 mx = get_amv(ctx, 0);
837 my = get_amv(ctx, 1);
838 } else {
839 s->current_picture.mb_type[xy] = MB_TYPE_SKIP |
840 MB_TYPE_16x16 |
841 MB_TYPE_L0;
842 mx = my = 0;
843 }
844 mot_val[0] =
845 mot_val[2] =
846 mot_val[0 + stride] =
847 mot_val[2 + stride] = mx;
848 mot_val[1] =
849 mot_val[3] =
850 mot_val[1 + stride] =
851 mot_val[3 + stride] = my;
852
853 if (s->mbintra_table[xy])
854 ff_clean_intra_table_entries(s);
855 continue;
856 }
857
858 cbpc = get_vlc2(&s->gb, ff_h263_inter_MCBPC_vlc.table, INTER_MCBPC_VLC_BITS, 2);
859 if (cbpc < 0) {
860 av_log(s->avctx, AV_LOG_ERROR,
861 "mcbpc corrupted at %d %d\n", s->mb_x, s->mb_y);
862 return AVERROR_INVALIDDATA;
863 }
864 if (cbpc == 20)
865 goto try_again;
866
867 s->cbp_table[xy] = cbpc & (8 + 3); // 8 is dquant
868
869 s->mb_intra = ((cbpc & 4) != 0);
870
871 if (s->mb_intra) {
872 s->current_picture.mb_type[xy] = MB_TYPE_INTRA;
873 s->mbintra_table[xy] = 1;
874 mot_val[0] =
875 mot_val[2] =
876 mot_val[0 + stride] =
877 mot_val[2 + stride] = 0;
878 mot_val[1] =
879 mot_val[3] =
880 mot_val[1 + stride] =
881 mot_val[3 + stride] = 0;
882 } else {
883 if (s->mbintra_table[xy])
884 ff_clean_intra_table_entries(s);
885
886 if (s->pict_type == AV_PICTURE_TYPE_S &&
887 ctx->vol_sprite_usage == GMC_SPRITE &&
888 (cbpc & 16) == 0)
889 s->mcsel = get_bits1(&s->gb);
890 else
891 s->mcsel = 0;
892
893 if ((cbpc & 16) == 0) {
894 /* 16x16 motion prediction */
895
896 ff_h263_pred_motion(s, 0, 0, &pred_x, &pred_y);
897 if (!s->mcsel) {
898 mx = ff_h263_decode_motion(s, pred_x, s->f_code);
899 if (mx >= 0xffff)
900 return AVERROR_INVALIDDATA;
901
902 my = ff_h263_decode_motion(s, pred_y, s->f_code);
903 if (my >= 0xffff)
904 return AVERROR_INVALIDDATA;
905 s->current_picture.mb_type[xy] = MB_TYPE_16x16 |
906 MB_TYPE_L0;
907 } else {
908 mx = get_amv(ctx, 0);
909 my = get_amv(ctx, 1);
910 s->current_picture.mb_type[xy] = MB_TYPE_16x16 |
911 MB_TYPE_GMC |
912 MB_TYPE_L0;
913 }
914
915 mot_val[0] =
916 mot_val[2] =
917 mot_val[0 + stride] =
918 mot_val[2 + stride] = mx;
919 mot_val[1] =
920 mot_val[3] =
921 mot_val[1 + stride] =
922 mot_val[3 + stride] = my;
923 } else {
924 int i;
925 s->current_picture.mb_type[xy] = MB_TYPE_8x8 |
926 MB_TYPE_L0;
927 for (i = 0; i < 4; i++) {
928 int16_t *mot_val = ff_h263_pred_motion(s, i, 0, &pred_x, &pred_y);
929 mx = ff_h263_decode_motion(s, pred_x, s->f_code);
930 if (mx >= 0xffff)
931 return AVERROR_INVALIDDATA;
932
933 my = ff_h263_decode_motion(s, pred_y, s->f_code);
934 if (my >= 0xffff)
935 return AVERROR_INVALIDDATA;
936 mot_val[0] = mx;
937 mot_val[1] = my;
938 }
939 }
940 }
941 }
942 }
943 s->mb_x = 0;
944 }
945
946 return mb_num;
947 }
948
949 /**
950 * decode second partition.
951 * @return <0 if an error occurred
952 */
mpeg4_decode_partition_b(MpegEncContext * s,int mb_count)953 static int mpeg4_decode_partition_b(MpegEncContext *s, int mb_count)
954 {
955 int mb_num = 0;
956 static const int8_t quant_tab[4] = { -1, -2, 1, 2 };
957
958 s->mb_x = s->resync_mb_x;
959 s->first_slice_line = 1;
960 for (s->mb_y = s->resync_mb_y; mb_num < mb_count; s->mb_y++) {
961 ff_init_block_index(s);
962 for (; mb_num < mb_count && s->mb_x < s->mb_width; s->mb_x++) {
963 const int xy = s->mb_x + s->mb_y * s->mb_stride;
964
965 mb_num++;
966 ff_update_block_index(s);
967 if (s->mb_x == s->resync_mb_x && s->mb_y == s->resync_mb_y + 1)
968 s->first_slice_line = 0;
969
970 if (s->pict_type == AV_PICTURE_TYPE_I) {
971 int ac_pred = get_bits1(&s->gb);
972 int cbpy = get_vlc2(&s->gb, ff_h263_cbpy_vlc.table, CBPY_VLC_BITS, 1);
973 if (cbpy < 0) {
974 av_log(s->avctx, AV_LOG_ERROR,
975 "cbpy corrupted at %d %d\n", s->mb_x, s->mb_y);
976 return AVERROR_INVALIDDATA;
977 }
978
979 s->cbp_table[xy] |= cbpy << 2;
980 s->current_picture.mb_type[xy] |= ac_pred * MB_TYPE_ACPRED;
981 } else { /* P || S_TYPE */
982 if (IS_INTRA(s->current_picture.mb_type[xy])) {
983 int i;
984 int dir = 0;
985 int ac_pred = get_bits1(&s->gb);
986 int cbpy = get_vlc2(&s->gb, ff_h263_cbpy_vlc.table, CBPY_VLC_BITS, 1);
987
988 if (cbpy < 0) {
989 av_log(s->avctx, AV_LOG_ERROR,
990 "I cbpy corrupted at %d %d\n", s->mb_x, s->mb_y);
991 return AVERROR_INVALIDDATA;
992 }
993
994 if (s->cbp_table[xy] & 8)
995 ff_set_qscale(s, s->qscale + quant_tab[get_bits(&s->gb, 2)]);
996 s->current_picture.qscale_table[xy] = s->qscale;
997
998 for (i = 0; i < 6; i++) {
999 int dc_pred_dir;
1000 int dc = mpeg4_decode_dc(s, i, &dc_pred_dir);
1001 if (dc < 0) {
1002 av_log(s->avctx, AV_LOG_ERROR,
1003 "DC corrupted at %d %d\n", s->mb_x, s->mb_y);
1004 return dc;
1005 }
1006 dir <<= 1;
1007 if (dc_pred_dir)
1008 dir |= 1;
1009 }
1010 s->cbp_table[xy] &= 3; // remove dquant
1011 s->cbp_table[xy] |= cbpy << 2;
1012 s->current_picture.mb_type[xy] |= ac_pred * MB_TYPE_ACPRED;
1013 s->pred_dir_table[xy] = dir;
1014 } else if (IS_SKIP(s->current_picture.mb_type[xy])) {
1015 s->current_picture.qscale_table[xy] = s->qscale;
1016 s->cbp_table[xy] = 0;
1017 } else {
1018 int cbpy = get_vlc2(&s->gb, ff_h263_cbpy_vlc.table, CBPY_VLC_BITS, 1);
1019
1020 if (cbpy < 0) {
1021 av_log(s->avctx, AV_LOG_ERROR,
1022 "P cbpy corrupted at %d %d\n", s->mb_x, s->mb_y);
1023 return AVERROR_INVALIDDATA;
1024 }
1025
1026 if (s->cbp_table[xy] & 8)
1027 ff_set_qscale(s, s->qscale + quant_tab[get_bits(&s->gb, 2)]);
1028 s->current_picture.qscale_table[xy] = s->qscale;
1029
1030 s->cbp_table[xy] &= 3; // remove dquant
1031 s->cbp_table[xy] |= (cbpy ^ 0xf) << 2;
1032 }
1033 }
1034 }
1035 if (mb_num >= mb_count)
1036 return 0;
1037 s->mb_x = 0;
1038 }
1039 return 0;
1040 }
1041
1042 /**
1043 * Decode the first and second partition.
1044 * @return <0 if error (and sets error type in the error_status_table)
1045 */
ff_mpeg4_decode_partitions(Mpeg4DecContext * ctx)1046 int ff_mpeg4_decode_partitions(Mpeg4DecContext *ctx)
1047 {
1048 MpegEncContext *s = &ctx->m;
1049 int mb_num;
1050 int ret;
1051 const int part_a_error = s->pict_type == AV_PICTURE_TYPE_I ? (ER_DC_ERROR | ER_MV_ERROR) : ER_MV_ERROR;
1052 const int part_a_end = s->pict_type == AV_PICTURE_TYPE_I ? (ER_DC_END | ER_MV_END) : ER_MV_END;
1053
1054 mb_num = mpeg4_decode_partition_a(ctx);
1055 if (mb_num <= 0) {
1056 ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y,
1057 s->mb_x, s->mb_y, part_a_error);
1058 return mb_num ? mb_num : AVERROR_INVALIDDATA;
1059 }
1060
1061 if (s->resync_mb_x + s->resync_mb_y * s->mb_width + mb_num > s->mb_num) {
1062 av_log(s->avctx, AV_LOG_ERROR, "slice below monitor ...\n");
1063 ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y,
1064 s->mb_x, s->mb_y, part_a_error);
1065 return AVERROR_INVALIDDATA;
1066 }
1067
1068 s->mb_num_left = mb_num;
1069
1070 if (s->pict_type == AV_PICTURE_TYPE_I) {
1071 while (show_bits(&s->gb, 9) == 1)
1072 skip_bits(&s->gb, 9);
1073 if (get_bits(&s->gb, 19) != DC_MARKER) {
1074 av_log(s->avctx, AV_LOG_ERROR,
1075 "marker missing after first I partition at %d %d\n",
1076 s->mb_x, s->mb_y);
1077 return AVERROR_INVALIDDATA;
1078 }
1079 } else {
1080 while (show_bits(&s->gb, 10) == 1)
1081 skip_bits(&s->gb, 10);
1082 if (get_bits(&s->gb, 17) != MOTION_MARKER) {
1083 av_log(s->avctx, AV_LOG_ERROR,
1084 "marker missing after first P partition at %d %d\n",
1085 s->mb_x, s->mb_y);
1086 return AVERROR_INVALIDDATA;
1087 }
1088 }
1089 ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y,
1090 s->mb_x - 1, s->mb_y, part_a_end);
1091
1092 ret = mpeg4_decode_partition_b(s, mb_num);
1093 if (ret < 0) {
1094 if (s->pict_type == AV_PICTURE_TYPE_P)
1095 ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y,
1096 s->mb_x, s->mb_y, ER_DC_ERROR);
1097 return ret;
1098 } else {
1099 if (s->pict_type == AV_PICTURE_TYPE_P)
1100 ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y,
1101 s->mb_x - 1, s->mb_y, ER_DC_END);
1102 }
1103
1104 return 0;
1105 }
1106
1107 /**
1108 * Decode a block.
1109 * @return <0 if an error occurred
1110 */
mpeg4_decode_block(Mpeg4DecContext * ctx,int16_t * block,int n,int coded,int intra,int use_intra_dc_vlc,int rvlc)1111 static inline int mpeg4_decode_block(Mpeg4DecContext *ctx, int16_t *block,
1112 int n, int coded, int intra,
1113 int use_intra_dc_vlc, int rvlc)
1114 {
1115 MpegEncContext *s = &ctx->m;
1116 int level, i, last, run, qmul, qadd;
1117 int av_uninit(dc_pred_dir);
1118 RLTable *rl;
1119 RL_VLC_ELEM *rl_vlc;
1120 const uint8_t *scan_table;
1121
1122 // Note intra & rvlc should be optimized away if this is inlined
1123
1124 if (intra) {
1125 if (use_intra_dc_vlc) {
1126 /* DC coef */
1127 if (s->partitioned_frame) {
1128 level = s->dc_val[0][s->block_index[n]];
1129 if (n < 4)
1130 level = FASTDIV((level + (s->y_dc_scale >> 1)), s->y_dc_scale);
1131 else
1132 level = FASTDIV((level + (s->c_dc_scale >> 1)), s->c_dc_scale);
1133 dc_pred_dir = (s->pred_dir_table[s->mb_x + s->mb_y * s->mb_stride] << n) & 32;
1134 } else {
1135 level = mpeg4_decode_dc(s, n, &dc_pred_dir);
1136 if (level < 0)
1137 return level;
1138 }
1139 block[0] = level;
1140 i = 0;
1141 } else {
1142 i = -1;
1143 ff_mpeg4_pred_dc(s, n, 0, &dc_pred_dir, 0);
1144 }
1145 if (!coded)
1146 goto not_coded;
1147
1148 if (rvlc) {
1149 rl = &ff_rvlc_rl_intra;
1150 rl_vlc = ff_rvlc_rl_intra.rl_vlc[0];
1151 } else {
1152 rl = &ff_mpeg4_rl_intra;
1153 rl_vlc = ff_mpeg4_rl_intra.rl_vlc[0];
1154 }
1155 if (s->ac_pred) {
1156 if (dc_pred_dir == 0)
1157 scan_table = s->intra_v_scantable.permutated; /* left */
1158 else
1159 scan_table = s->intra_h_scantable.permutated; /* top */
1160 } else {
1161 scan_table = s->intra_scantable.permutated;
1162 }
1163 qmul = 1;
1164 qadd = 0;
1165 } else {
1166 i = -1;
1167 if (!coded) {
1168 s->block_last_index[n] = i;
1169 return 0;
1170 }
1171 if (rvlc)
1172 rl = &ff_rvlc_rl_inter;
1173 else
1174 rl = &ff_h263_rl_inter;
1175
1176 scan_table = s->intra_scantable.permutated;
1177
1178 if (s->mpeg_quant) {
1179 qmul = 1;
1180 qadd = 0;
1181 if (rvlc)
1182 rl_vlc = ff_rvlc_rl_inter.rl_vlc[0];
1183 else
1184 rl_vlc = ff_h263_rl_inter.rl_vlc[0];
1185 } else {
1186 qmul = s->qscale << 1;
1187 qadd = (s->qscale - 1) | 1;
1188 if (rvlc)
1189 rl_vlc = ff_rvlc_rl_inter.rl_vlc[s->qscale];
1190 else
1191 rl_vlc = ff_h263_rl_inter.rl_vlc[s->qscale];
1192 }
1193 }
1194 {
1195 OPEN_READER(re, &s->gb);
1196 for (;;) {
1197 UPDATE_CACHE(re, &s->gb);
1198 GET_RL_VLC(level, run, re, &s->gb, rl_vlc, TEX_VLC_BITS, 2, 0);
1199 if (level == 0) {
1200 /* escape */
1201 if (rvlc) {
1202 if (SHOW_UBITS(re, &s->gb, 1) == 0) {
1203 av_log(s->avctx, AV_LOG_ERROR,
1204 "1. marker bit missing in rvlc esc\n");
1205 return AVERROR_INVALIDDATA;
1206 }
1207 SKIP_CACHE(re, &s->gb, 1);
1208
1209 last = SHOW_UBITS(re, &s->gb, 1);
1210 SKIP_CACHE(re, &s->gb, 1);
1211 run = SHOW_UBITS(re, &s->gb, 6);
1212 SKIP_COUNTER(re, &s->gb, 1 + 1 + 6);
1213 UPDATE_CACHE(re, &s->gb);
1214
1215 if (SHOW_UBITS(re, &s->gb, 1) == 0) {
1216 av_log(s->avctx, AV_LOG_ERROR,
1217 "2. marker bit missing in rvlc esc\n");
1218 return AVERROR_INVALIDDATA;
1219 }
1220 SKIP_CACHE(re, &s->gb, 1);
1221
1222 level = SHOW_UBITS(re, &s->gb, 11);
1223 SKIP_CACHE(re, &s->gb, 11);
1224
1225 if (SHOW_UBITS(re, &s->gb, 5) != 0x10) {
1226 av_log(s->avctx, AV_LOG_ERROR, "reverse esc missing\n");
1227 return AVERROR_INVALIDDATA;
1228 }
1229 SKIP_CACHE(re, &s->gb, 5);
1230
1231 level = level * qmul + qadd;
1232 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1233 SKIP_COUNTER(re, &s->gb, 1 + 11 + 5 + 1);
1234
1235 i += run + 1;
1236 if (last)
1237 i += 192;
1238 } else {
1239 int cache;
1240 cache = GET_CACHE(re, &s->gb);
1241
1242 if (IS_3IV1)
1243 cache ^= 0xC0000000;
1244
1245 if (cache & 0x80000000) {
1246 if (cache & 0x40000000) {
1247 /* third escape */
1248 SKIP_CACHE(re, &s->gb, 2);
1249 last = SHOW_UBITS(re, &s->gb, 1);
1250 SKIP_CACHE(re, &s->gb, 1);
1251 run = SHOW_UBITS(re, &s->gb, 6);
1252 SKIP_COUNTER(re, &s->gb, 2 + 1 + 6);
1253 UPDATE_CACHE(re, &s->gb);
1254
1255 if (IS_3IV1) {
1256 level = SHOW_SBITS(re, &s->gb, 12);
1257 LAST_SKIP_BITS(re, &s->gb, 12);
1258 } else {
1259 if (SHOW_UBITS(re, &s->gb, 1) == 0) {
1260 av_log(s->avctx, AV_LOG_ERROR,
1261 "1. marker bit missing in 3. esc\n");
1262 if (!(s->avctx->err_recognition & AV_EF_IGNORE_ERR) || get_bits_left(&s->gb) <= 0)
1263 return AVERROR_INVALIDDATA;
1264 }
1265 SKIP_CACHE(re, &s->gb, 1);
1266
1267 level = SHOW_SBITS(re, &s->gb, 12);
1268 SKIP_CACHE(re, &s->gb, 12);
1269
1270 if (SHOW_UBITS(re, &s->gb, 1) == 0) {
1271 av_log(s->avctx, AV_LOG_ERROR,
1272 "2. marker bit missing in 3. esc\n");
1273 if (!(s->avctx->err_recognition & AV_EF_IGNORE_ERR) || get_bits_left(&s->gb) <= 0)
1274 return AVERROR_INVALIDDATA;
1275 }
1276
1277 SKIP_COUNTER(re, &s->gb, 1 + 12 + 1);
1278 }
1279
1280 #if 0
1281 if (s->error_recognition >= FF_ER_COMPLIANT) {
1282 const int abs_level= FFABS(level);
1283 if (abs_level<=MAX_LEVEL && run<=MAX_RUN) {
1284 const int run1= run - rl->max_run[last][abs_level] - 1;
1285 if (abs_level <= rl->max_level[last][run]) {
1286 av_log(s->avctx, AV_LOG_ERROR, "illegal 3. esc, vlc encoding possible\n");
1287 return AVERROR_INVALIDDATA;
1288 }
1289 if (s->error_recognition > FF_ER_COMPLIANT) {
1290 if (abs_level <= rl->max_level[last][run]*2) {
1291 av_log(s->avctx, AV_LOG_ERROR, "illegal 3. esc, esc 1 encoding possible\n");
1292 return AVERROR_INVALIDDATA;
1293 }
1294 if (run1 >= 0 && abs_level <= rl->max_level[last][run1]) {
1295 av_log(s->avctx, AV_LOG_ERROR, "illegal 3. esc, esc 2 encoding possible\n");
1296 return AVERROR_INVALIDDATA;
1297 }
1298 }
1299 }
1300 }
1301 #endif
1302 if (level > 0)
1303 level = level * qmul + qadd;
1304 else
1305 level = level * qmul - qadd;
1306
1307 if ((unsigned)(level + 2048) > 4095) {
1308 if (s->avctx->err_recognition & (AV_EF_BITSTREAM|AV_EF_AGGRESSIVE)) {
1309 if (level > 2560 || level < -2560) {
1310 av_log(s->avctx, AV_LOG_ERROR,
1311 "|level| overflow in 3. esc, qp=%d\n",
1312 s->qscale);
1313 return AVERROR_INVALIDDATA;
1314 }
1315 }
1316 level = level < 0 ? -2048 : 2047;
1317 }
1318
1319 i += run + 1;
1320 if (last)
1321 i += 192;
1322 } else {
1323 /* second escape */
1324 SKIP_BITS(re, &s->gb, 2);
1325 GET_RL_VLC(level, run, re, &s->gb, rl_vlc, TEX_VLC_BITS, 2, 1);
1326 i += run + rl->max_run[run >> 7][level / qmul] + 1; // FIXME opt indexing
1327 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1328 LAST_SKIP_BITS(re, &s->gb, 1);
1329 }
1330 } else {
1331 /* first escape */
1332 SKIP_BITS(re, &s->gb, 1);
1333 GET_RL_VLC(level, run, re, &s->gb, rl_vlc, TEX_VLC_BITS, 2, 1);
1334 i += run;
1335 level = level + rl->max_level[run >> 7][(run - 1) & 63] * qmul; // FIXME opt indexing
1336 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1337 LAST_SKIP_BITS(re, &s->gb, 1);
1338 }
1339 }
1340 } else {
1341 i += run;
1342 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1343 LAST_SKIP_BITS(re, &s->gb, 1);
1344 }
1345 ff_tlog(s->avctx, "dct[%d][%d] = %- 4d end?:%d\n", scan_table[i&63]&7, scan_table[i&63] >> 3, level, i>62);
1346 if (i > 62) {
1347 i -= 192;
1348 if (i & (~63)) {
1349 av_log(s->avctx, AV_LOG_ERROR,
1350 "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
1351 return AVERROR_INVALIDDATA;
1352 }
1353
1354 block[scan_table[i]] = level;
1355 break;
1356 }
1357
1358 block[scan_table[i]] = level;
1359 }
1360 CLOSE_READER(re, &s->gb);
1361 }
1362
1363 not_coded:
1364 if (intra) {
1365 if (!use_intra_dc_vlc) {
1366 block[0] = ff_mpeg4_pred_dc(s, n, block[0], &dc_pred_dir, 0);
1367
1368 i -= i >> 31; // if (i == -1) i = 0;
1369 }
1370
1371 ff_mpeg4_pred_ac(s, block, n, dc_pred_dir);
1372 if (s->ac_pred)
1373 i = 63; // FIXME not optimal
1374 }
1375 s->block_last_index[n] = i;
1376 return 0;
1377 }
1378
1379 /**
1380 * decode partition C of one MB.
1381 * @return <0 if an error occurred
1382 */
mpeg4_decode_partitioned_mb(MpegEncContext * s,int16_t block[6][64])1383 static int mpeg4_decode_partitioned_mb(MpegEncContext *s, int16_t block[6][64])
1384 {
1385 Mpeg4DecContext *ctx = s->avctx->priv_data;
1386 int cbp, mb_type, use_intra_dc_vlc;
1387 const int xy = s->mb_x + s->mb_y * s->mb_stride;
1388
1389 av_assert2(s == (void*)ctx);
1390
1391 mb_type = s->current_picture.mb_type[xy];
1392 cbp = s->cbp_table[xy];
1393
1394 use_intra_dc_vlc = s->qscale < ctx->intra_dc_threshold;
1395
1396 if (s->current_picture.qscale_table[xy] != s->qscale)
1397 ff_set_qscale(s, s->current_picture.qscale_table[xy]);
1398
1399 if (s->pict_type == AV_PICTURE_TYPE_P ||
1400 s->pict_type == AV_PICTURE_TYPE_S) {
1401 int i;
1402 for (i = 0; i < 4; i++) {
1403 s->mv[0][i][0] = s->current_picture.motion_val[0][s->block_index[i]][0];
1404 s->mv[0][i][1] = s->current_picture.motion_val[0][s->block_index[i]][1];
1405 }
1406 s->mb_intra = IS_INTRA(mb_type);
1407
1408 if (IS_SKIP(mb_type)) {
1409 /* skip mb */
1410 for (i = 0; i < 6; i++)
1411 s->block_last_index[i] = -1;
1412 s->mv_dir = MV_DIR_FORWARD;
1413 s->mv_type = MV_TYPE_16X16;
1414 if (s->pict_type == AV_PICTURE_TYPE_S
1415 && ctx->vol_sprite_usage == GMC_SPRITE) {
1416 s->mcsel = 1;
1417 s->mb_skipped = 0;
1418 } else {
1419 s->mcsel = 0;
1420 s->mb_skipped = 1;
1421 }
1422 } else if (s->mb_intra) {
1423 s->ac_pred = IS_ACPRED(s->current_picture.mb_type[xy]);
1424 } else if (!s->mb_intra) {
1425 // s->mcsel = 0; // FIXME do we need to init that?
1426
1427 s->mv_dir = MV_DIR_FORWARD;
1428 if (IS_8X8(mb_type)) {
1429 s->mv_type = MV_TYPE_8X8;
1430 } else {
1431 s->mv_type = MV_TYPE_16X16;
1432 }
1433 }
1434 } else { /* I-Frame */
1435 s->mb_intra = 1;
1436 s->ac_pred = IS_ACPRED(s->current_picture.mb_type[xy]);
1437 }
1438
1439 if (!IS_SKIP(mb_type)) {
1440 int i;
1441 s->bdsp.clear_blocks(s->block[0]);
1442 /* decode each block */
1443 for (i = 0; i < 6; i++) {
1444 if (mpeg4_decode_block(ctx, block[i], i, cbp & 32, s->mb_intra,
1445 use_intra_dc_vlc, ctx->rvlc) < 0) {
1446 av_log(s->avctx, AV_LOG_ERROR,
1447 "texture corrupted at %d %d %d\n",
1448 s->mb_x, s->mb_y, s->mb_intra);
1449 return AVERROR_INVALIDDATA;
1450 }
1451 cbp += cbp;
1452 }
1453 }
1454
1455 /* per-MB end of slice check */
1456 if (--s->mb_num_left <= 0) {
1457 if (mpeg4_is_resync(ctx))
1458 return SLICE_END;
1459 else
1460 return SLICE_NOEND;
1461 } else {
1462 if (mpeg4_is_resync(ctx)) {
1463 const int delta = s->mb_x + 1 == s->mb_width ? 2 : 1;
1464 if (s->cbp_table[xy + delta])
1465 return SLICE_END;
1466 }
1467 return SLICE_OK;
1468 }
1469 }
1470
mpeg4_decode_mb(MpegEncContext * s,int16_t block[6][64])1471 static int mpeg4_decode_mb(MpegEncContext *s, int16_t block[6][64])
1472 {
1473 Mpeg4DecContext *ctx = s->avctx->priv_data;
1474 int cbpc, cbpy, i, cbp, pred_x, pred_y, mx, my, dquant;
1475 int16_t *mot_val;
1476 static const int8_t quant_tab[4] = { -1, -2, 1, 2 };
1477 const int xy = s->mb_x + s->mb_y * s->mb_stride;
1478
1479 av_assert2(s == (void*)ctx);
1480 av_assert2(s->h263_pred);
1481
1482 if (s->pict_type == AV_PICTURE_TYPE_P ||
1483 s->pict_type == AV_PICTURE_TYPE_S) {
1484 do {
1485 if (get_bits1(&s->gb)) {
1486 /* skip mb */
1487 s->mb_intra = 0;
1488 for (i = 0; i < 6; i++)
1489 s->block_last_index[i] = -1;
1490 s->mv_dir = MV_DIR_FORWARD;
1491 s->mv_type = MV_TYPE_16X16;
1492 if (s->pict_type == AV_PICTURE_TYPE_S &&
1493 ctx->vol_sprite_usage == GMC_SPRITE) {
1494 s->current_picture.mb_type[xy] = MB_TYPE_SKIP |
1495 MB_TYPE_GMC |
1496 MB_TYPE_16x16 |
1497 MB_TYPE_L0;
1498 s->mcsel = 1;
1499 s->mv[0][0][0] = get_amv(ctx, 0);
1500 s->mv[0][0][1] = get_amv(ctx, 1);
1501 s->mb_skipped = 0;
1502 } else {
1503 s->current_picture.mb_type[xy] = MB_TYPE_SKIP |
1504 MB_TYPE_16x16 |
1505 MB_TYPE_L0;
1506 s->mcsel = 0;
1507 s->mv[0][0][0] = 0;
1508 s->mv[0][0][1] = 0;
1509 s->mb_skipped = 1;
1510 }
1511 goto end;
1512 }
1513 cbpc = get_vlc2(&s->gb, ff_h263_inter_MCBPC_vlc.table, INTER_MCBPC_VLC_BITS, 2);
1514 if (cbpc < 0) {
1515 av_log(s->avctx, AV_LOG_ERROR,
1516 "mcbpc damaged at %d %d\n", s->mb_x, s->mb_y);
1517 return AVERROR_INVALIDDATA;
1518 }
1519 } while (cbpc == 20);
1520
1521 s->bdsp.clear_blocks(s->block[0]);
1522 dquant = cbpc & 8;
1523 s->mb_intra = ((cbpc & 4) != 0);
1524 if (s->mb_intra)
1525 goto intra;
1526
1527 if (s->pict_type == AV_PICTURE_TYPE_S &&
1528 ctx->vol_sprite_usage == GMC_SPRITE && (cbpc & 16) == 0)
1529 s->mcsel = get_bits1(&s->gb);
1530 else
1531 s->mcsel = 0;
1532 cbpy = get_vlc2(&s->gb, ff_h263_cbpy_vlc.table, CBPY_VLC_BITS, 1) ^ 0x0F;
1533 if (cbpy < 0) {
1534 av_log(s->avctx, AV_LOG_ERROR,
1535 "P cbpy damaged at %d %d\n", s->mb_x, s->mb_y);
1536 return AVERROR_INVALIDDATA;
1537 }
1538
1539 cbp = (cbpc & 3) | (cbpy << 2);
1540 if (dquant)
1541 ff_set_qscale(s, s->qscale + quant_tab[get_bits(&s->gb, 2)]);
1542 if ((!s->progressive_sequence) &&
1543 (cbp || (s->workaround_bugs & FF_BUG_XVID_ILACE)))
1544 s->interlaced_dct = get_bits1(&s->gb);
1545
1546 s->mv_dir = MV_DIR_FORWARD;
1547 if ((cbpc & 16) == 0) {
1548 if (s->mcsel) {
1549 s->current_picture.mb_type[xy] = MB_TYPE_GMC |
1550 MB_TYPE_16x16 |
1551 MB_TYPE_L0;
1552 /* 16x16 global motion prediction */
1553 s->mv_type = MV_TYPE_16X16;
1554 mx = get_amv(ctx, 0);
1555 my = get_amv(ctx, 1);
1556 s->mv[0][0][0] = mx;
1557 s->mv[0][0][1] = my;
1558 } else if ((!s->progressive_sequence) && get_bits1(&s->gb)) {
1559 s->current_picture.mb_type[xy] = MB_TYPE_16x8 |
1560 MB_TYPE_L0 |
1561 MB_TYPE_INTERLACED;
1562 /* 16x8 field motion prediction */
1563 s->mv_type = MV_TYPE_FIELD;
1564
1565 s->field_select[0][0] = get_bits1(&s->gb);
1566 s->field_select[0][1] = get_bits1(&s->gb);
1567
1568 ff_h263_pred_motion(s, 0, 0, &pred_x, &pred_y);
1569
1570 for (i = 0; i < 2; i++) {
1571 mx = ff_h263_decode_motion(s, pred_x, s->f_code);
1572 if (mx >= 0xffff)
1573 return AVERROR_INVALIDDATA;
1574
1575 my = ff_h263_decode_motion(s, pred_y / 2, s->f_code);
1576 if (my >= 0xffff)
1577 return AVERROR_INVALIDDATA;
1578
1579 s->mv[0][i][0] = mx;
1580 s->mv[0][i][1] = my;
1581 }
1582 } else {
1583 s->current_picture.mb_type[xy] = MB_TYPE_16x16 | MB_TYPE_L0;
1584 /* 16x16 motion prediction */
1585 s->mv_type = MV_TYPE_16X16;
1586 ff_h263_pred_motion(s, 0, 0, &pred_x, &pred_y);
1587 mx = ff_h263_decode_motion(s, pred_x, s->f_code);
1588
1589 if (mx >= 0xffff)
1590 return AVERROR_INVALIDDATA;
1591
1592 my = ff_h263_decode_motion(s, pred_y, s->f_code);
1593
1594 if (my >= 0xffff)
1595 return AVERROR_INVALIDDATA;
1596 s->mv[0][0][0] = mx;
1597 s->mv[0][0][1] = my;
1598 }
1599 } else {
1600 s->current_picture.mb_type[xy] = MB_TYPE_8x8 | MB_TYPE_L0;
1601 s->mv_type = MV_TYPE_8X8;
1602 for (i = 0; i < 4; i++) {
1603 mot_val = ff_h263_pred_motion(s, i, 0, &pred_x, &pred_y);
1604 mx = ff_h263_decode_motion(s, pred_x, s->f_code);
1605 if (mx >= 0xffff)
1606 return AVERROR_INVALIDDATA;
1607
1608 my = ff_h263_decode_motion(s, pred_y, s->f_code);
1609 if (my >= 0xffff)
1610 return AVERROR_INVALIDDATA;
1611 s->mv[0][i][0] = mx;
1612 s->mv[0][i][1] = my;
1613 mot_val[0] = mx;
1614 mot_val[1] = my;
1615 }
1616 }
1617 } else if (s->pict_type == AV_PICTURE_TYPE_B) {
1618 int modb1; // first bit of modb
1619 int modb2; // second bit of modb
1620 int mb_type;
1621
1622 s->mb_intra = 0; // B-frames never contain intra blocks
1623 s->mcsel = 0; // ... true gmc blocks
1624
1625 if (s->mb_x == 0) {
1626 for (i = 0; i < 2; i++) {
1627 s->last_mv[i][0][0] =
1628 s->last_mv[i][0][1] =
1629 s->last_mv[i][1][0] =
1630 s->last_mv[i][1][1] = 0;
1631 }
1632
1633 ff_thread_await_progress(&s->next_picture_ptr->tf, s->mb_y, 0);
1634 }
1635
1636 /* if we skipped it in the future P-frame than skip it now too */
1637 s->mb_skipped = s->next_picture.mbskip_table[s->mb_y * s->mb_stride + s->mb_x]; // Note, skiptab=0 if last was GMC
1638
1639 if (s->mb_skipped) {
1640 /* skip mb */
1641 for (i = 0; i < 6; i++)
1642 s->block_last_index[i] = -1;
1643
1644 s->mv_dir = MV_DIR_FORWARD;
1645 s->mv_type = MV_TYPE_16X16;
1646 s->mv[0][0][0] =
1647 s->mv[0][0][1] =
1648 s->mv[1][0][0] =
1649 s->mv[1][0][1] = 0;
1650 s->current_picture.mb_type[xy] = MB_TYPE_SKIP |
1651 MB_TYPE_16x16 |
1652 MB_TYPE_L0;
1653 goto end;
1654 }
1655
1656 modb1 = get_bits1(&s->gb);
1657 if (modb1) {
1658 // like MB_TYPE_B_DIRECT but no vectors coded
1659 mb_type = MB_TYPE_DIRECT2 | MB_TYPE_SKIP | MB_TYPE_L0L1;
1660 cbp = 0;
1661 } else {
1662 modb2 = get_bits1(&s->gb);
1663 mb_type = get_vlc2(&s->gb, mb_type_b_vlc.table, MB_TYPE_B_VLC_BITS, 1);
1664 if (mb_type < 0) {
1665 av_log(s->avctx, AV_LOG_ERROR, "illegal MB_type\n");
1666 return AVERROR_INVALIDDATA;
1667 }
1668 mb_type = mb_type_b_map[mb_type];
1669 if (modb2) {
1670 cbp = 0;
1671 } else {
1672 s->bdsp.clear_blocks(s->block[0]);
1673 cbp = get_bits(&s->gb, 6);
1674 }
1675
1676 if ((!IS_DIRECT(mb_type)) && cbp) {
1677 if (get_bits1(&s->gb))
1678 ff_set_qscale(s, s->qscale + get_bits1(&s->gb) * 4 - 2);
1679 }
1680
1681 if (!s->progressive_sequence) {
1682 if (cbp)
1683 s->interlaced_dct = get_bits1(&s->gb);
1684
1685 if (!IS_DIRECT(mb_type) && get_bits1(&s->gb)) {
1686 mb_type |= MB_TYPE_16x8 | MB_TYPE_INTERLACED;
1687 mb_type &= ~MB_TYPE_16x16;
1688
1689 if (USES_LIST(mb_type, 0)) {
1690 s->field_select[0][0] = get_bits1(&s->gb);
1691 s->field_select[0][1] = get_bits1(&s->gb);
1692 }
1693 if (USES_LIST(mb_type, 1)) {
1694 s->field_select[1][0] = get_bits1(&s->gb);
1695 s->field_select[1][1] = get_bits1(&s->gb);
1696 }
1697 }
1698 }
1699
1700 s->mv_dir = 0;
1701 if ((mb_type & (MB_TYPE_DIRECT2 | MB_TYPE_INTERLACED)) == 0) {
1702 s->mv_type = MV_TYPE_16X16;
1703
1704 if (USES_LIST(mb_type, 0)) {
1705 s->mv_dir = MV_DIR_FORWARD;
1706
1707 mx = ff_h263_decode_motion(s, s->last_mv[0][0][0], s->f_code);
1708 my = ff_h263_decode_motion(s, s->last_mv[0][0][1], s->f_code);
1709 s->last_mv[0][1][0] =
1710 s->last_mv[0][0][0] =
1711 s->mv[0][0][0] = mx;
1712 s->last_mv[0][1][1] =
1713 s->last_mv[0][0][1] =
1714 s->mv[0][0][1] = my;
1715 }
1716
1717 if (USES_LIST(mb_type, 1)) {
1718 s->mv_dir |= MV_DIR_BACKWARD;
1719
1720 mx = ff_h263_decode_motion(s, s->last_mv[1][0][0], s->b_code);
1721 my = ff_h263_decode_motion(s, s->last_mv[1][0][1], s->b_code);
1722 s->last_mv[1][1][0] =
1723 s->last_mv[1][0][0] =
1724 s->mv[1][0][0] = mx;
1725 s->last_mv[1][1][1] =
1726 s->last_mv[1][0][1] =
1727 s->mv[1][0][1] = my;
1728 }
1729 } else if (!IS_DIRECT(mb_type)) {
1730 s->mv_type = MV_TYPE_FIELD;
1731
1732 if (USES_LIST(mb_type, 0)) {
1733 s->mv_dir = MV_DIR_FORWARD;
1734
1735 for (i = 0; i < 2; i++) {
1736 mx = ff_h263_decode_motion(s, s->last_mv[0][i][0], s->f_code);
1737 my = ff_h263_decode_motion(s, s->last_mv[0][i][1] / 2, s->f_code);
1738 s->last_mv[0][i][0] =
1739 s->mv[0][i][0] = mx;
1740 s->last_mv[0][i][1] = (s->mv[0][i][1] = my) * 2;
1741 }
1742 }
1743
1744 if (USES_LIST(mb_type, 1)) {
1745 s->mv_dir |= MV_DIR_BACKWARD;
1746
1747 for (i = 0; i < 2; i++) {
1748 mx = ff_h263_decode_motion(s, s->last_mv[1][i][0], s->b_code);
1749 my = ff_h263_decode_motion(s, s->last_mv[1][i][1] / 2, s->b_code);
1750 s->last_mv[1][i][0] =
1751 s->mv[1][i][0] = mx;
1752 s->last_mv[1][i][1] = (s->mv[1][i][1] = my) * 2;
1753 }
1754 }
1755 }
1756 }
1757
1758 if (IS_DIRECT(mb_type)) {
1759 if (IS_SKIP(mb_type)) {
1760 mx =
1761 my = 0;
1762 } else {
1763 mx = ff_h263_decode_motion(s, 0, 1);
1764 my = ff_h263_decode_motion(s, 0, 1);
1765 }
1766
1767 s->mv_dir = MV_DIR_FORWARD | MV_DIR_BACKWARD | MV_DIRECT;
1768 mb_type |= ff_mpeg4_set_direct_mv(s, mx, my);
1769 }
1770 s->current_picture.mb_type[xy] = mb_type;
1771 } else { /* I-Frame */
1772 int use_intra_dc_vlc;
1773
1774 do {
1775 cbpc = get_vlc2(&s->gb, ff_h263_intra_MCBPC_vlc.table, INTRA_MCBPC_VLC_BITS, 2);
1776 if (cbpc < 0) {
1777 av_log(s->avctx, AV_LOG_ERROR,
1778 "I cbpc damaged at %d %d\n", s->mb_x, s->mb_y);
1779 return AVERROR_INVALIDDATA;
1780 }
1781 } while (cbpc == 8);
1782
1783 dquant = cbpc & 4;
1784 s->mb_intra = 1;
1785
1786 intra:
1787 s->ac_pred = get_bits1(&s->gb);
1788 if (s->ac_pred)
1789 s->current_picture.mb_type[xy] = MB_TYPE_INTRA | MB_TYPE_ACPRED;
1790 else
1791 s->current_picture.mb_type[xy] = MB_TYPE_INTRA;
1792
1793 cbpy = get_vlc2(&s->gb, ff_h263_cbpy_vlc.table, CBPY_VLC_BITS, 1);
1794 if (cbpy < 0) {
1795 av_log(s->avctx, AV_LOG_ERROR,
1796 "I cbpy damaged at %d %d\n", s->mb_x, s->mb_y);
1797 return AVERROR_INVALIDDATA;
1798 }
1799 cbp = (cbpc & 3) | (cbpy << 2);
1800
1801 use_intra_dc_vlc = s->qscale < ctx->intra_dc_threshold;
1802
1803 if (dquant)
1804 ff_set_qscale(s, s->qscale + quant_tab[get_bits(&s->gb, 2)]);
1805
1806 if (!s->progressive_sequence)
1807 s->interlaced_dct = get_bits1(&s->gb);
1808
1809 s->bdsp.clear_blocks(s->block[0]);
1810 /* decode each block */
1811 for (i = 0; i < 6; i++) {
1812 if (mpeg4_decode_block(ctx, block[i], i, cbp & 32,
1813 1, use_intra_dc_vlc, 0) < 0)
1814 return AVERROR_INVALIDDATA;
1815 cbp += cbp;
1816 }
1817 goto end;
1818 }
1819
1820 /* decode each block */
1821 for (i = 0; i < 6; i++) {
1822 if (mpeg4_decode_block(ctx, block[i], i, cbp & 32, 0, 0, 0) < 0)
1823 return AVERROR_INVALIDDATA;
1824 cbp += cbp;
1825 }
1826
1827 end:
1828 /* per-MB end of slice check */
1829 if (s->codec_id == AV_CODEC_ID_MPEG4) {
1830 int next = mpeg4_is_resync(ctx);
1831 if (next) {
1832 if (s->mb_x + s->mb_y*s->mb_width + 1 > next && (s->avctx->err_recognition & AV_EF_AGGRESSIVE)) {
1833 return AVERROR_INVALIDDATA;
1834 } else if (s->mb_x + s->mb_y*s->mb_width + 1 >= next)
1835 return SLICE_END;
1836
1837 if (s->pict_type == AV_PICTURE_TYPE_B) {
1838 const int delta= s->mb_x + 1 == s->mb_width ? 2 : 1;
1839 ff_thread_await_progress(&s->next_picture_ptr->tf,
1840 (s->mb_x + delta >= s->mb_width)
1841 ? FFMIN(s->mb_y + 1, s->mb_height - 1)
1842 : s->mb_y, 0);
1843 if (s->next_picture.mbskip_table[xy + delta])
1844 return SLICE_OK;
1845 }
1846
1847 return SLICE_END;
1848 }
1849 }
1850
1851 return SLICE_OK;
1852 }
1853
1854 /* As per spec, studio start code search isn't the same as the old type of start code */
next_start_code_studio(GetBitContext * gb)1855 static void next_start_code_studio(GetBitContext *gb)
1856 {
1857 align_get_bits(gb);
1858
1859 while (get_bits_left(gb) >= 24 && show_bits(gb, 24) != 0x1) {
1860 get_bits(gb, 8);
1861 }
1862 }
1863
1864 /* additional_code, vlc index */
1865 static const uint8_t ac_state_tab[22][2] =
1866 {
1867 {0, 0},
1868 {0, 1},
1869 {1, 1},
1870 {2, 1},
1871 {3, 1},
1872 {4, 1},
1873 {5, 1},
1874 {1, 2},
1875 {2, 2},
1876 {3, 2},
1877 {4, 2},
1878 {5, 2},
1879 {6, 2},
1880 {1, 3},
1881 {2, 4},
1882 {3, 5},
1883 {4, 6},
1884 {5, 7},
1885 {6, 8},
1886 {7, 9},
1887 {8, 10},
1888 {0, 11}
1889 };
1890
mpeg4_decode_studio_block(MpegEncContext * s,int32_t block[64],int n)1891 static int mpeg4_decode_studio_block(MpegEncContext *s, int32_t block[64], int n)
1892 {
1893 Mpeg4DecContext *ctx = s->avctx->priv_data;
1894
1895 int cc, dct_dc_size, dct_diff, code, j, idx = 1, group = 0, run = 0,
1896 additional_code_len, sign, mismatch;
1897 const VLC *cur_vlc = &studio_intra_tab[0];
1898 uint8_t *const scantable = s->intra_scantable.permutated;
1899 const uint16_t *quant_matrix;
1900 uint32_t flc;
1901 const int min = -1 * (1 << (s->avctx->bits_per_raw_sample + 6));
1902 const int max = ((1 << (s->avctx->bits_per_raw_sample + 6)) - 1);
1903 int shift = 3 - s->dct_precision;
1904
1905 mismatch = 1;
1906
1907 memset(block, 0, 64 * sizeof(int32_t));
1908
1909 if (n < 4) {
1910 cc = 0;
1911 dct_dc_size = get_vlc2(&s->gb, studio_luma_dc.table, STUDIO_INTRA_BITS, 2);
1912 quant_matrix = s->intra_matrix;
1913 } else {
1914 cc = (n & 1) + 1;
1915 if (ctx->rgb)
1916 dct_dc_size = get_vlc2(&s->gb, studio_luma_dc.table, STUDIO_INTRA_BITS, 2);
1917 else
1918 dct_dc_size = get_vlc2(&s->gb, studio_chroma_dc.table, STUDIO_INTRA_BITS, 2);
1919 quant_matrix = s->chroma_intra_matrix;
1920 }
1921
1922 if (dct_dc_size == 0) {
1923 dct_diff = 0;
1924 } else {
1925 dct_diff = get_xbits(&s->gb, dct_dc_size);
1926
1927 if (dct_dc_size > 8) {
1928 if(!check_marker(s->avctx, &s->gb, "dct_dc_size > 8"))
1929 return AVERROR_INVALIDDATA;
1930 }
1931
1932 }
1933
1934 s->last_dc[cc] += dct_diff;
1935
1936 if (s->mpeg_quant)
1937 block[0] = s->last_dc[cc] * (8 >> s->intra_dc_precision);
1938 else
1939 block[0] = s->last_dc[cc] * (8 >> s->intra_dc_precision) * (8 >> s->dct_precision);
1940 /* TODO: support mpeg_quant for AC coefficients */
1941
1942 block[0] = av_clip(block[0], min, max);
1943 mismatch ^= block[0];
1944
1945 /* AC Coefficients */
1946 while (1) {
1947 group = get_vlc2(&s->gb, cur_vlc->table, STUDIO_INTRA_BITS, 2);
1948
1949 if (group < 0) {
1950 av_log(s->avctx, AV_LOG_ERROR, "illegal ac coefficient group vlc\n");
1951 return AVERROR_INVALIDDATA;
1952 }
1953
1954 additional_code_len = ac_state_tab[group][0];
1955 cur_vlc = &studio_intra_tab[ac_state_tab[group][1]];
1956
1957 if (group == 0) {
1958 /* End of Block */
1959 break;
1960 } else if (group >= 1 && group <= 6) {
1961 /* Zero run length (Table B.47) */
1962 run = 1 << additional_code_len;
1963 if (additional_code_len)
1964 run += get_bits(&s->gb, additional_code_len);
1965 idx += run;
1966 continue;
1967 } else if (group >= 7 && group <= 12) {
1968 /* Zero run length and +/-1 level (Table B.48) */
1969 code = get_bits(&s->gb, additional_code_len);
1970 sign = code & 1;
1971 code >>= 1;
1972 run = (1 << (additional_code_len - 1)) + code;
1973 idx += run;
1974 if (idx > 63)
1975 return AVERROR_INVALIDDATA;
1976 j = scantable[idx++];
1977 block[j] = sign ? 1 : -1;
1978 } else if (group >= 13 && group <= 20) {
1979 /* Level value (Table B.49) */
1980 if (idx > 63)
1981 return AVERROR_INVALIDDATA;
1982 j = scantable[idx++];
1983 block[j] = get_xbits(&s->gb, additional_code_len);
1984 } else if (group == 21) {
1985 /* Escape */
1986 if (idx > 63)
1987 return AVERROR_INVALIDDATA;
1988 j = scantable[idx++];
1989 additional_code_len = s->avctx->bits_per_raw_sample + s->dct_precision + 4;
1990 flc = get_bits(&s->gb, additional_code_len);
1991 if (flc >> (additional_code_len-1))
1992 block[j] = -1 * (( flc ^ ((1 << additional_code_len) -1)) + 1);
1993 else
1994 block[j] = flc;
1995 }
1996 block[j] = ((block[j] * quant_matrix[j] * s->qscale) * (1 << shift)) / 16;
1997 block[j] = av_clip(block[j], min, max);
1998 mismatch ^= block[j];
1999 }
2000
2001 block[63] ^= mismatch & 1;
2002
2003 return 0;
2004 }
2005
mpeg4_decode_dpcm_macroblock(MpegEncContext * s,int16_t macroblock[256],int n)2006 static int mpeg4_decode_dpcm_macroblock(MpegEncContext *s, int16_t macroblock[256], int n)
2007 {
2008 int i, j, w, h, idx = 0;
2009 int block_mean, rice_parameter, rice_prefix_code, rice_suffix_code,
2010 dpcm_residual, left, top, topleft, min_left_top, max_left_top, p, p2, output;
2011 h = 16 >> (n ? s->chroma_y_shift : 0);
2012 w = 16 >> (n ? s->chroma_x_shift : 0);
2013
2014 block_mean = get_bits(&s->gb, s->avctx->bits_per_raw_sample);
2015 if (block_mean == 0){
2016 av_log(s->avctx, AV_LOG_ERROR, "Forbidden block_mean\n");
2017 return AVERROR_INVALIDDATA;
2018 }
2019 s->last_dc[n] = block_mean * (1 << (s->dct_precision + s->intra_dc_precision));
2020
2021 rice_parameter = get_bits(&s->gb, 4);
2022 if (rice_parameter == 0) {
2023 av_log(s->avctx, AV_LOG_ERROR, "Forbidden rice_parameter\n");
2024 return AVERROR_INVALIDDATA;
2025 }
2026
2027 if (rice_parameter == 15)
2028 rice_parameter = 0;
2029
2030 if (rice_parameter > 11) {
2031 av_log(s->avctx, AV_LOG_ERROR, "Forbidden rice_parameter\n");
2032 return AVERROR_INVALIDDATA;
2033 }
2034
2035 for (i = 0; i < h; i++) {
2036 output = 1 << (s->avctx->bits_per_raw_sample - 1);
2037 top = 1 << (s->avctx->bits_per_raw_sample - 1);
2038
2039 for (j = 0; j < w; j++) {
2040 left = output;
2041 topleft = top;
2042
2043 rice_prefix_code = get_unary(&s->gb, 1, 12);
2044
2045 /* Escape */
2046 if (rice_prefix_code == 11)
2047 dpcm_residual = get_bits(&s->gb, s->avctx->bits_per_raw_sample);
2048 else {
2049 if (rice_prefix_code == 12) {
2050 av_log(s->avctx, AV_LOG_ERROR, "Forbidden rice_prefix_code\n");
2051 return AVERROR_INVALIDDATA;
2052 }
2053 rice_suffix_code = get_bitsz(&s->gb, rice_parameter);
2054 dpcm_residual = (rice_prefix_code << rice_parameter) + rice_suffix_code;
2055 }
2056
2057 /* Map to a signed residual */
2058 if (dpcm_residual & 1)
2059 dpcm_residual = (-1 * dpcm_residual) >> 1;
2060 else
2061 dpcm_residual = (dpcm_residual >> 1);
2062
2063 if (i != 0)
2064 top = macroblock[idx-w];
2065
2066 p = left + top - topleft;
2067 min_left_top = FFMIN(left, top);
2068 if (p < min_left_top)
2069 p = min_left_top;
2070
2071 max_left_top = FFMAX(left, top);
2072 if (p > max_left_top)
2073 p = max_left_top;
2074
2075 p2 = (FFMIN(min_left_top, topleft) + FFMAX(max_left_top, topleft)) >> 1;
2076 if (p2 == p)
2077 p2 = block_mean;
2078
2079 if (p2 > p)
2080 dpcm_residual *= -1;
2081
2082 macroblock[idx++] = output = (dpcm_residual + p) & ((1 << s->avctx->bits_per_raw_sample) - 1);
2083 }
2084 }
2085
2086 return 0;
2087 }
2088
mpeg4_decode_studio_mb(MpegEncContext * s,int16_t block_[12][64])2089 static int mpeg4_decode_studio_mb(MpegEncContext *s, int16_t block_[12][64])
2090 {
2091 Mpeg4DecContext *const ctx = (Mpeg4DecContext*)s;
2092 int i;
2093
2094 ctx->dpcm_direction = 0;
2095
2096 /* StudioMacroblock */
2097 /* Assumes I-VOP */
2098 s->mb_intra = 1;
2099 if (get_bits1(&s->gb)) { /* compression_mode */
2100 /* DCT */
2101 /* macroblock_type, 1 or 2-bit VLC */
2102 if (!get_bits1(&s->gb)) {
2103 skip_bits1(&s->gb);
2104 s->qscale = mpeg_get_qscale(s);
2105 }
2106
2107 for (i = 0; i < mpeg4_block_count[s->chroma_format]; i++) {
2108 if (mpeg4_decode_studio_block(s, ctx->block32[i], i) < 0)
2109 return AVERROR_INVALIDDATA;
2110 }
2111 } else {
2112 /* DPCM */
2113 check_marker(s->avctx, &s->gb, "DPCM block start");
2114 ctx->dpcm_direction = get_bits1(&s->gb) ? -1 : 1;
2115 for (i = 0; i < 3; i++) {
2116 if (mpeg4_decode_dpcm_macroblock(s, ctx->dpcm_macroblock[i], i) < 0)
2117 return AVERROR_INVALIDDATA;
2118 }
2119 }
2120
2121 if (get_bits_left(&s->gb) >= 24 && show_bits(&s->gb, 23) == 0) {
2122 next_start_code_studio(&s->gb);
2123 return SLICE_END;
2124 }
2125
2126 //vcon-stp9L1.bits (first frame)
2127 if (get_bits_left(&s->gb) == 0)
2128 return SLICE_END;
2129
2130 //vcon-stp2L1.bits, vcon-stp3L1.bits, vcon-stp6L1.bits, vcon-stp7L1.bits, vcon-stp8L1.bits, vcon-stp10L1.bits (first frame)
2131 if (get_bits_left(&s->gb) < 8U && show_bits(&s->gb, get_bits_left(&s->gb)) == 0)
2132 return SLICE_END;
2133
2134 return SLICE_OK;
2135 }
2136
mpeg4_decode_gop_header(MpegEncContext * s,GetBitContext * gb)2137 static int mpeg4_decode_gop_header(MpegEncContext *s, GetBitContext *gb)
2138 {
2139 int hours, minutes, seconds;
2140
2141 if (!show_bits(gb, 23)) {
2142 av_log(s->avctx, AV_LOG_WARNING, "GOP header invalid\n");
2143 return AVERROR_INVALIDDATA;
2144 }
2145
2146 hours = get_bits(gb, 5);
2147 minutes = get_bits(gb, 6);
2148 check_marker(s->avctx, gb, "in gop_header");
2149 seconds = get_bits(gb, 6);
2150
2151 s->time_base = seconds + 60*(minutes + 60*hours);
2152
2153 skip_bits1(gb);
2154 skip_bits1(gb);
2155
2156 return 0;
2157 }
2158
mpeg4_decode_profile_level(MpegEncContext * s,GetBitContext * gb,int * profile,int * level)2159 static int mpeg4_decode_profile_level(MpegEncContext *s, GetBitContext *gb, int *profile, int *level)
2160 {
2161
2162 *profile = get_bits(gb, 4);
2163 *level = get_bits(gb, 4);
2164
2165 // for Simple profile, level 0
2166 if (*profile == 0 && *level == 8) {
2167 *level = 0;
2168 }
2169
2170 return 0;
2171 }
2172
mpeg4_decode_visual_object(MpegEncContext * s,GetBitContext * gb)2173 static int mpeg4_decode_visual_object(MpegEncContext *s, GetBitContext *gb)
2174 {
2175 int visual_object_type;
2176 int is_visual_object_identifier = get_bits1(gb);
2177
2178 if (is_visual_object_identifier) {
2179 skip_bits(gb, 4+3);
2180 }
2181 visual_object_type = get_bits(gb, 4);
2182
2183 if (visual_object_type == VOT_VIDEO_ID ||
2184 visual_object_type == VOT_STILL_TEXTURE_ID) {
2185 int video_signal_type = get_bits1(gb);
2186 if (video_signal_type) {
2187 int video_range, color_description;
2188 skip_bits(gb, 3); // video_format
2189 video_range = get_bits1(gb);
2190 color_description = get_bits1(gb);
2191
2192 s->avctx->color_range = video_range ? AVCOL_RANGE_JPEG : AVCOL_RANGE_MPEG;
2193
2194 if (color_description) {
2195 s->avctx->color_primaries = get_bits(gb, 8);
2196 s->avctx->color_trc = get_bits(gb, 8);
2197 s->avctx->colorspace = get_bits(gb, 8);
2198 }
2199 }
2200 }
2201
2202 return 0;
2203 }
2204
mpeg4_load_default_matrices(MpegEncContext * s)2205 static void mpeg4_load_default_matrices(MpegEncContext *s)
2206 {
2207 int i, v;
2208
2209 /* load default matrices */
2210 for (i = 0; i < 64; i++) {
2211 int j = s->idsp.idct_permutation[i];
2212 v = ff_mpeg4_default_intra_matrix[i];
2213 s->intra_matrix[j] = v;
2214 s->chroma_intra_matrix[j] = v;
2215
2216 v = ff_mpeg4_default_non_intra_matrix[i];
2217 s->inter_matrix[j] = v;
2218 s->chroma_inter_matrix[j] = v;
2219 }
2220 }
2221
read_quant_matrix_ext(MpegEncContext * s,GetBitContext * gb)2222 static int read_quant_matrix_ext(MpegEncContext *s, GetBitContext *gb)
2223 {
2224 int i, j, v;
2225
2226 if (get_bits1(gb)) {
2227 if (get_bits_left(gb) < 64*8)
2228 return AVERROR_INVALIDDATA;
2229 /* intra_quantiser_matrix */
2230 for (i = 0; i < 64; i++) {
2231 v = get_bits(gb, 8);
2232 j = s->idsp.idct_permutation[ff_zigzag_direct[i]];
2233 s->intra_matrix[j] = v;
2234 s->chroma_intra_matrix[j] = v;
2235 }
2236 }
2237
2238 if (get_bits1(gb)) {
2239 if (get_bits_left(gb) < 64*8)
2240 return AVERROR_INVALIDDATA;
2241 /* non_intra_quantiser_matrix */
2242 for (i = 0; i < 64; i++) {
2243 get_bits(gb, 8);
2244 }
2245 }
2246
2247 if (get_bits1(gb)) {
2248 if (get_bits_left(gb) < 64*8)
2249 return AVERROR_INVALIDDATA;
2250 /* chroma_intra_quantiser_matrix */
2251 for (i = 0; i < 64; i++) {
2252 v = get_bits(gb, 8);
2253 j = s->idsp.idct_permutation[ff_zigzag_direct[i]];
2254 s->chroma_intra_matrix[j] = v;
2255 }
2256 }
2257
2258 if (get_bits1(gb)) {
2259 if (get_bits_left(gb) < 64*8)
2260 return AVERROR_INVALIDDATA;
2261 /* chroma_non_intra_quantiser_matrix */
2262 for (i = 0; i < 64; i++) {
2263 get_bits(gb, 8);
2264 }
2265 }
2266
2267 next_start_code_studio(gb);
2268 return 0;
2269 }
2270
extension_and_user_data(MpegEncContext * s,GetBitContext * gb,int id)2271 static void extension_and_user_data(MpegEncContext *s, GetBitContext *gb, int id)
2272 {
2273 uint32_t startcode;
2274 uint8_t extension_type;
2275
2276 startcode = show_bits_long(gb, 32);
2277 if (startcode == USER_DATA_STARTCODE || startcode == EXT_STARTCODE) {
2278
2279 if ((id == 2 || id == 4) && startcode == EXT_STARTCODE) {
2280 skip_bits_long(gb, 32);
2281 extension_type = get_bits(gb, 4);
2282 if (extension_type == QUANT_MATRIX_EXT_ID)
2283 read_quant_matrix_ext(s, gb);
2284 }
2285 }
2286 }
2287
decode_studio_vol_header(Mpeg4DecContext * ctx,GetBitContext * gb)2288 static int decode_studio_vol_header(Mpeg4DecContext *ctx, GetBitContext *gb)
2289 {
2290 MpegEncContext *s = &ctx->m;
2291 int width, height, aspect_ratio_info;
2292 int bits_per_raw_sample;
2293 int rgb, chroma_format;
2294
2295 // random_accessible_vol and video_object_type_indication have already
2296 // been read by the caller decode_vol_header()
2297 skip_bits(gb, 4); /* video_object_layer_verid */
2298 ctx->shape = get_bits(gb, 2); /* video_object_layer_shape */
2299 skip_bits(gb, 4); /* video_object_layer_shape_extension */
2300 skip_bits1(gb); /* progressive_sequence */
2301 if (ctx->shape != RECT_SHAPE) {
2302 avpriv_request_sample(s->avctx, "MPEG-4 Studio profile non rectangular shape");
2303 return AVERROR_PATCHWELCOME;
2304 }
2305 if (ctx->shape != BIN_ONLY_SHAPE) {
2306 rgb = get_bits1(gb); /* rgb_components */
2307 chroma_format = get_bits(gb, 2); /* chroma_format */
2308 if (!chroma_format || chroma_format == CHROMA_420 || (rgb && chroma_format == CHROMA_422)) {
2309 av_log(s->avctx, AV_LOG_ERROR, "illegal chroma format\n");
2310 return AVERROR_INVALIDDATA;
2311 }
2312
2313 bits_per_raw_sample = get_bits(gb, 4); /* bit_depth */
2314 if (bits_per_raw_sample == 10) {
2315 if (rgb) {
2316 s->avctx->pix_fmt = AV_PIX_FMT_GBRP10;
2317 } else {
2318 s->avctx->pix_fmt = chroma_format == CHROMA_422 ? AV_PIX_FMT_YUV422P10 : AV_PIX_FMT_YUV444P10;
2319 }
2320 } else {
2321 avpriv_request_sample(s->avctx, "MPEG-4 Studio profile bit-depth %u", bits_per_raw_sample);
2322 return AVERROR_PATCHWELCOME;
2323 }
2324 if (rgb != ctx->rgb || s->chroma_format != chroma_format)
2325 s->context_reinit = 1;
2326 s->avctx->bits_per_raw_sample = bits_per_raw_sample;
2327 ctx->rgb = rgb;
2328 s->chroma_format = chroma_format;
2329 }
2330 if (ctx->shape == RECT_SHAPE) {
2331 check_marker(s->avctx, gb, "before video_object_layer_width");
2332 width = get_bits(gb, 14); /* video_object_layer_width */
2333 check_marker(s->avctx, gb, "before video_object_layer_height");
2334 height = get_bits(gb, 14); /* video_object_layer_height */
2335 check_marker(s->avctx, gb, "after video_object_layer_height");
2336
2337 /* Do the same check as non-studio profile */
2338 if (width && height) {
2339 if (s->width && s->height &&
2340 (s->width != width || s->height != height))
2341 s->context_reinit = 1;
2342 s->width = width;
2343 s->height = height;
2344 }
2345 }
2346 aspect_ratio_info = get_bits(gb, 4);
2347 if (aspect_ratio_info == FF_ASPECT_EXTENDED) {
2348 s->avctx->sample_aspect_ratio.num = get_bits(gb, 8); // par_width
2349 s->avctx->sample_aspect_ratio.den = get_bits(gb, 8); // par_height
2350 } else {
2351 s->avctx->sample_aspect_ratio = ff_h263_pixel_aspect[aspect_ratio_info];
2352 }
2353 skip_bits(gb, 4); /* frame_rate_code */
2354 skip_bits(gb, 15); /* first_half_bit_rate */
2355 check_marker(s->avctx, gb, "after first_half_bit_rate");
2356 skip_bits(gb, 15); /* latter_half_bit_rate */
2357 check_marker(s->avctx, gb, "after latter_half_bit_rate");
2358 skip_bits(gb, 15); /* first_half_vbv_buffer_size */
2359 check_marker(s->avctx, gb, "after first_half_vbv_buffer_size");
2360 skip_bits(gb, 3); /* latter_half_vbv_buffer_size */
2361 skip_bits(gb, 11); /* first_half_vbv_buffer_size */
2362 check_marker(s->avctx, gb, "after first_half_vbv_buffer_size");
2363 skip_bits(gb, 15); /* latter_half_vbv_occupancy */
2364 check_marker(s->avctx, gb, "after latter_half_vbv_occupancy");
2365 s->low_delay = get_bits1(gb);
2366 s->mpeg_quant = get_bits1(gb); /* mpeg2_stream */
2367
2368 next_start_code_studio(gb);
2369 extension_and_user_data(s, gb, 2);
2370
2371 return 0;
2372 }
2373
decode_vol_header(Mpeg4DecContext * ctx,GetBitContext * gb)2374 static int decode_vol_header(Mpeg4DecContext *ctx, GetBitContext *gb)
2375 {
2376 MpegEncContext *s = &ctx->m;
2377 int width, height, vo_ver_id, aspect_ratio_info;
2378
2379 /* vol header */
2380 skip_bits(gb, 1); /* random access */
2381 ctx->vo_type = get_bits(gb, 8);
2382
2383 /* If we are in studio profile (per vo_type), check if its all consistent
2384 * and if so continue pass control to decode_studio_vol_header().
2385 * elIf something is inconsistent, error out
2386 * else continue with (non studio) vol header decpoding.
2387 */
2388 if (ctx->vo_type == CORE_STUDIO_VO_TYPE ||
2389 ctx->vo_type == SIMPLE_STUDIO_VO_TYPE) {
2390 if (s->avctx->profile != FF_PROFILE_UNKNOWN && s->avctx->profile != FF_PROFILE_MPEG4_SIMPLE_STUDIO)
2391 return AVERROR_INVALIDDATA;
2392 s->studio_profile = 1;
2393 s->avctx->profile = FF_PROFILE_MPEG4_SIMPLE_STUDIO;
2394 return decode_studio_vol_header(ctx, gb);
2395 } else if (s->studio_profile) {
2396 return AVERROR_PATCHWELCOME;
2397 }
2398
2399 if (get_bits1(gb) != 0) { /* is_ol_id */
2400 vo_ver_id = get_bits(gb, 4); /* vo_ver_id */
2401 skip_bits(gb, 3); /* vo_priority */
2402 } else {
2403 vo_ver_id = 1;
2404 }
2405 aspect_ratio_info = get_bits(gb, 4);
2406 if (aspect_ratio_info == FF_ASPECT_EXTENDED) {
2407 s->avctx->sample_aspect_ratio.num = get_bits(gb, 8); // par_width
2408 s->avctx->sample_aspect_ratio.den = get_bits(gb, 8); // par_height
2409 } else {
2410 s->avctx->sample_aspect_ratio = ff_h263_pixel_aspect[aspect_ratio_info];
2411 }
2412
2413 if ((ctx->vol_control_parameters = get_bits1(gb))) { /* vol control parameter */
2414 int chroma_format = get_bits(gb, 2);
2415 if (chroma_format != CHROMA_420)
2416 av_log(s->avctx, AV_LOG_ERROR, "illegal chroma format\n");
2417
2418 s->low_delay = get_bits1(gb);
2419 if (get_bits1(gb)) { /* vbv parameters */
2420 get_bits(gb, 15); /* first_half_bitrate */
2421 check_marker(s->avctx, gb, "after first_half_bitrate");
2422 get_bits(gb, 15); /* latter_half_bitrate */
2423 check_marker(s->avctx, gb, "after latter_half_bitrate");
2424 get_bits(gb, 15); /* first_half_vbv_buffer_size */
2425 check_marker(s->avctx, gb, "after first_half_vbv_buffer_size");
2426 get_bits(gb, 3); /* latter_half_vbv_buffer_size */
2427 get_bits(gb, 11); /* first_half_vbv_occupancy */
2428 check_marker(s->avctx, gb, "after first_half_vbv_occupancy");
2429 get_bits(gb, 15); /* latter_half_vbv_occupancy */
2430 check_marker(s->avctx, gb, "after latter_half_vbv_occupancy");
2431 }
2432 } else {
2433 /* is setting low delay flag only once the smartest thing to do?
2434 * low delay detection will not be overridden. */
2435 if (s->picture_number == 0) {
2436 switch (ctx->vo_type) {
2437 case SIMPLE_VO_TYPE:
2438 case ADV_SIMPLE_VO_TYPE:
2439 s->low_delay = 1;
2440 break;
2441 default:
2442 s->low_delay = 0;
2443 }
2444 }
2445 }
2446
2447 ctx->shape = get_bits(gb, 2); /* vol shape */
2448 if (ctx->shape != RECT_SHAPE)
2449 av_log(s->avctx, AV_LOG_ERROR, "only rectangular vol supported\n");
2450 if (ctx->shape == GRAY_SHAPE && vo_ver_id != 1) {
2451 av_log(s->avctx, AV_LOG_ERROR, "Gray shape not supported\n");
2452 skip_bits(gb, 4); /* video_object_layer_shape_extension */
2453 }
2454
2455 check_marker(s->avctx, gb, "before time_increment_resolution");
2456
2457 s->avctx->framerate.num = get_bits(gb, 16);
2458 if (!s->avctx->framerate.num) {
2459 av_log(s->avctx, AV_LOG_ERROR, "framerate==0\n");
2460 return AVERROR_INVALIDDATA;
2461 }
2462
2463 ctx->time_increment_bits = av_log2(s->avctx->framerate.num - 1) + 1;
2464 if (ctx->time_increment_bits < 1)
2465 ctx->time_increment_bits = 1;
2466
2467 check_marker(s->avctx, gb, "before fixed_vop_rate");
2468
2469 if (get_bits1(gb) != 0) /* fixed_vop_rate */
2470 s->avctx->framerate.den = get_bits(gb, ctx->time_increment_bits);
2471 else
2472 s->avctx->framerate.den = 1;
2473
2474 s->avctx->time_base = av_inv_q(av_mul_q(s->avctx->framerate, (AVRational){s->avctx->ticks_per_frame, 1}));
2475
2476 ctx->t_frame = 0;
2477
2478 if (ctx->shape != BIN_ONLY_SHAPE) {
2479 if (ctx->shape == RECT_SHAPE) {
2480 check_marker(s->avctx, gb, "before width");
2481 width = get_bits(gb, 13);
2482 check_marker(s->avctx, gb, "before height");
2483 height = get_bits(gb, 13);
2484 check_marker(s->avctx, gb, "after height");
2485 if (width && height && /* they should be non zero but who knows */
2486 !(s->width && s->codec_tag == AV_RL32("MP4S"))) {
2487 if (s->width && s->height &&
2488 (s->width != width || s->height != height))
2489 s->context_reinit = 1;
2490 s->width = width;
2491 s->height = height;
2492 }
2493 }
2494
2495 s->progressive_sequence =
2496 s->progressive_frame = get_bits1(gb) ^ 1;
2497 s->interlaced_dct = 0;
2498 if (!get_bits1(gb) && (s->avctx->debug & FF_DEBUG_PICT_INFO))
2499 av_log(s->avctx, AV_LOG_INFO, /* OBMC Disable */
2500 "MPEG-4 OBMC not supported (very likely buggy encoder)\n");
2501 if (vo_ver_id == 1)
2502 ctx->vol_sprite_usage = get_bits1(gb); /* vol_sprite_usage */
2503 else
2504 ctx->vol_sprite_usage = get_bits(gb, 2); /* vol_sprite_usage */
2505
2506 if (ctx->vol_sprite_usage == STATIC_SPRITE)
2507 av_log(s->avctx, AV_LOG_ERROR, "Static Sprites not supported\n");
2508 if (ctx->vol_sprite_usage == STATIC_SPRITE ||
2509 ctx->vol_sprite_usage == GMC_SPRITE) {
2510 if (ctx->vol_sprite_usage == STATIC_SPRITE) {
2511 skip_bits(gb, 13); // sprite_width
2512 check_marker(s->avctx, gb, "after sprite_width");
2513 skip_bits(gb, 13); // sprite_height
2514 check_marker(s->avctx, gb, "after sprite_height");
2515 skip_bits(gb, 13); // sprite_left
2516 check_marker(s->avctx, gb, "after sprite_left");
2517 skip_bits(gb, 13); // sprite_top
2518 check_marker(s->avctx, gb, "after sprite_top");
2519 }
2520 ctx->num_sprite_warping_points = get_bits(gb, 6);
2521 if (ctx->num_sprite_warping_points > 3) {
2522 av_log(s->avctx, AV_LOG_ERROR,
2523 "%d sprite_warping_points\n",
2524 ctx->num_sprite_warping_points);
2525 ctx->num_sprite_warping_points = 0;
2526 return AVERROR_INVALIDDATA;
2527 }
2528 s->sprite_warping_accuracy = get_bits(gb, 2);
2529 ctx->sprite_brightness_change = get_bits1(gb);
2530 if (ctx->vol_sprite_usage == STATIC_SPRITE)
2531 skip_bits1(gb); // low_latency_sprite
2532 }
2533 // FIXME sadct disable bit if verid!=1 && shape not rect
2534
2535 if (get_bits1(gb) == 1) { /* not_8_bit */
2536 s->quant_precision = get_bits(gb, 4); /* quant_precision */
2537 if (get_bits(gb, 4) != 8) /* bits_per_pixel */
2538 av_log(s->avctx, AV_LOG_ERROR, "N-bit not supported\n");
2539 if (s->quant_precision != 5)
2540 av_log(s->avctx, AV_LOG_ERROR,
2541 "quant precision %d\n", s->quant_precision);
2542 if (s->quant_precision<3 || s->quant_precision>9) {
2543 s->quant_precision = 5;
2544 }
2545 } else {
2546 s->quant_precision = 5;
2547 }
2548
2549 // FIXME a bunch of grayscale shape things
2550
2551 if ((s->mpeg_quant = get_bits1(gb))) { /* vol_quant_type */
2552 int i, v;
2553
2554 mpeg4_load_default_matrices(s);
2555
2556 /* load custom intra matrix */
2557 if (get_bits1(gb)) {
2558 int last = 0;
2559 for (i = 0; i < 64; i++) {
2560 int j;
2561 if (get_bits_left(gb) < 8) {
2562 av_log(s->avctx, AV_LOG_ERROR, "insufficient data for custom matrix\n");
2563 return AVERROR_INVALIDDATA;
2564 }
2565 v = get_bits(gb, 8);
2566 if (v == 0)
2567 break;
2568
2569 last = v;
2570 j = s->idsp.idct_permutation[ff_zigzag_direct[i]];
2571 s->intra_matrix[j] = last;
2572 s->chroma_intra_matrix[j] = last;
2573 }
2574
2575 /* replicate last value */
2576 for (; i < 64; i++) {
2577 int j = s->idsp.idct_permutation[ff_zigzag_direct[i]];
2578 s->intra_matrix[j] = last;
2579 s->chroma_intra_matrix[j] = last;
2580 }
2581 }
2582
2583 /* load custom non intra matrix */
2584 if (get_bits1(gb)) {
2585 int last = 0;
2586 for (i = 0; i < 64; i++) {
2587 int j;
2588 if (get_bits_left(gb) < 8) {
2589 av_log(s->avctx, AV_LOG_ERROR, "insufficient data for custom matrix\n");
2590 return AVERROR_INVALIDDATA;
2591 }
2592 v = get_bits(gb, 8);
2593 if (v == 0)
2594 break;
2595
2596 last = v;
2597 j = s->idsp.idct_permutation[ff_zigzag_direct[i]];
2598 s->inter_matrix[j] = v;
2599 s->chroma_inter_matrix[j] = v;
2600 }
2601
2602 /* replicate last value */
2603 for (; i < 64; i++) {
2604 int j = s->idsp.idct_permutation[ff_zigzag_direct[i]];
2605 s->inter_matrix[j] = last;
2606 s->chroma_inter_matrix[j] = last;
2607 }
2608 }
2609
2610 // FIXME a bunch of grayscale shape things
2611 }
2612
2613 if (vo_ver_id != 1)
2614 s->quarter_sample = get_bits1(gb);
2615 else
2616 s->quarter_sample = 0;
2617
2618 if (get_bits_left(gb) < 4) {
2619 av_log(s->avctx, AV_LOG_ERROR, "VOL Header truncated\n");
2620 return AVERROR_INVALIDDATA;
2621 }
2622
2623 if (!get_bits1(gb)) {
2624 int pos = get_bits_count(gb);
2625 int estimation_method = get_bits(gb, 2);
2626 if (estimation_method < 2) {
2627 if (!get_bits1(gb)) {
2628 ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* opaque */
2629 ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* transparent */
2630 ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* intra_cae */
2631 ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* inter_cae */
2632 ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* no_update */
2633 ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* upsampling */
2634 }
2635 if (!get_bits1(gb)) {
2636 ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* intra_blocks */
2637 ctx->cplx_estimation_trash_p += 8 * get_bits1(gb); /* inter_blocks */
2638 ctx->cplx_estimation_trash_p += 8 * get_bits1(gb); /* inter4v_blocks */
2639 ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* not coded blocks */
2640 }
2641 if (!check_marker(s->avctx, gb, "in complexity estimation part 1")) {
2642 skip_bits_long(gb, pos - get_bits_count(gb));
2643 goto no_cplx_est;
2644 }
2645 if (!get_bits1(gb)) {
2646 ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* dct_coeffs */
2647 ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* dct_lines */
2648 ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* vlc_syms */
2649 ctx->cplx_estimation_trash_i += 4 * get_bits1(gb); /* vlc_bits */
2650 }
2651 if (!get_bits1(gb)) {
2652 ctx->cplx_estimation_trash_p += 8 * get_bits1(gb); /* apm */
2653 ctx->cplx_estimation_trash_p += 8 * get_bits1(gb); /* npm */
2654 ctx->cplx_estimation_trash_b += 8 * get_bits1(gb); /* interpolate_mc_q */
2655 ctx->cplx_estimation_trash_p += 8 * get_bits1(gb); /* forwback_mc_q */
2656 ctx->cplx_estimation_trash_p += 8 * get_bits1(gb); /* halfpel2 */
2657 ctx->cplx_estimation_trash_p += 8 * get_bits1(gb); /* halfpel4 */
2658 }
2659 if (!check_marker(s->avctx, gb, "in complexity estimation part 2")) {
2660 skip_bits_long(gb, pos - get_bits_count(gb));
2661 goto no_cplx_est;
2662 }
2663 if (estimation_method == 1) {
2664 ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* sadct */
2665 ctx->cplx_estimation_trash_p += 8 * get_bits1(gb); /* qpel */
2666 }
2667 } else
2668 av_log(s->avctx, AV_LOG_ERROR,
2669 "Invalid Complexity estimation method %d\n",
2670 estimation_method);
2671 } else {
2672
2673 no_cplx_est:
2674 ctx->cplx_estimation_trash_i =
2675 ctx->cplx_estimation_trash_p =
2676 ctx->cplx_estimation_trash_b = 0;
2677 }
2678
2679 ctx->resync_marker = !get_bits1(gb); /* resync_marker_disabled */
2680
2681 s->data_partitioning = get_bits1(gb);
2682 if (s->data_partitioning)
2683 ctx->rvlc = get_bits1(gb);
2684
2685 if (vo_ver_id != 1) {
2686 ctx->new_pred = get_bits1(gb);
2687 if (ctx->new_pred) {
2688 av_log(s->avctx, AV_LOG_ERROR, "new pred not supported\n");
2689 skip_bits(gb, 2); /* requested upstream message type */
2690 skip_bits1(gb); /* newpred segment type */
2691 }
2692 if (get_bits1(gb)) // reduced_res_vop
2693 av_log(s->avctx, AV_LOG_ERROR,
2694 "reduced resolution VOP not supported\n");
2695 } else {
2696 ctx->new_pred = 0;
2697 }
2698
2699 ctx->scalability = get_bits1(gb);
2700
2701 if (ctx->scalability) {
2702 GetBitContext bak = *gb;
2703 int h_sampling_factor_n;
2704 int h_sampling_factor_m;
2705 int v_sampling_factor_n;
2706 int v_sampling_factor_m;
2707
2708 skip_bits1(gb); // hierarchy_type
2709 skip_bits(gb, 4); /* ref_layer_id */
2710 skip_bits1(gb); /* ref_layer_sampling_dir */
2711 h_sampling_factor_n = get_bits(gb, 5);
2712 h_sampling_factor_m = get_bits(gb, 5);
2713 v_sampling_factor_n = get_bits(gb, 5);
2714 v_sampling_factor_m = get_bits(gb, 5);
2715 ctx->enhancement_type = get_bits1(gb);
2716
2717 if (h_sampling_factor_n == 0 || h_sampling_factor_m == 0 ||
2718 v_sampling_factor_n == 0 || v_sampling_factor_m == 0) {
2719 /* illegal scalability header (VERY broken encoder),
2720 * trying to workaround */
2721 ctx->scalability = 0;
2722 *gb = bak;
2723 } else
2724 av_log(s->avctx, AV_LOG_ERROR, "scalability not supported\n");
2725
2726 // bin shape stuff FIXME
2727 }
2728 }
2729
2730 if (s->avctx->debug&FF_DEBUG_PICT_INFO) {
2731 av_log(s->avctx, AV_LOG_DEBUG, "tb %d/%d, tincrbits:%d, qp_prec:%d, ps:%d, low_delay:%d %s%s%s%s\n",
2732 s->avctx->framerate.den, s->avctx->framerate.num,
2733 ctx->time_increment_bits,
2734 s->quant_precision,
2735 s->progressive_sequence,
2736 s->low_delay,
2737 ctx->scalability ? "scalability " :"" , s->quarter_sample ? "qpel " : "",
2738 s->data_partitioning ? "partition " : "", ctx->rvlc ? "rvlc " : ""
2739 );
2740 }
2741
2742 return 0;
2743 }
2744
2745 /**
2746 * Decode the user data stuff in the header.
2747 * Also initializes divx/xvid/lavc_version/build.
2748 */
decode_user_data(Mpeg4DecContext * ctx,GetBitContext * gb)2749 static int decode_user_data(Mpeg4DecContext *ctx, GetBitContext *gb)
2750 {
2751 MpegEncContext *s = &ctx->m;
2752 char buf[256];
2753 int i;
2754 int e;
2755 int ver = 0, build = 0, ver2 = 0, ver3 = 0;
2756 char last;
2757
2758 for (i = 0; i < 255 && get_bits_count(gb) < gb->size_in_bits; i++) {
2759 if (show_bits(gb, 23) == 0)
2760 break;
2761 buf[i] = get_bits(gb, 8);
2762 }
2763 buf[i] = 0;
2764
2765 /* divx detection */
2766 e = sscanf(buf, "DivX%dBuild%d%c", &ver, &build, &last);
2767 if (e < 2)
2768 e = sscanf(buf, "DivX%db%d%c", &ver, &build, &last);
2769 if (e >= 2) {
2770 ctx->divx_version = ver;
2771 ctx->divx_build = build;
2772 s->divx_packed = e == 3 && last == 'p';
2773 }
2774
2775 /* libavcodec detection */
2776 e = sscanf(buf, "FFmpe%*[^b]b%d", &build) + 3;
2777 if (e != 4)
2778 e = sscanf(buf, "FFmpeg v%d.%d.%d / libavcodec build: %d", &ver, &ver2, &ver3, &build);
2779 if (e != 4) {
2780 e = sscanf(buf, "Lavc%d.%d.%d", &ver, &ver2, &ver3) + 1;
2781 if (e > 1) {
2782 if (ver > 0xFFU || ver2 > 0xFFU || ver3 > 0xFFU) {
2783 av_log(s->avctx, AV_LOG_WARNING,
2784 "Unknown Lavc version string encountered, %d.%d.%d; "
2785 "clamping sub-version values to 8-bits.\n",
2786 ver, ver2, ver3);
2787 }
2788 build = ((ver & 0xFF) << 16) + ((ver2 & 0xFF) << 8) + (ver3 & 0xFF);
2789 }
2790 }
2791 if (e != 4) {
2792 if (strcmp(buf, "ffmpeg") == 0)
2793 ctx->lavc_build = 4600;
2794 }
2795 if (e == 4)
2796 ctx->lavc_build = build;
2797
2798 /* Xvid detection */
2799 e = sscanf(buf, "XviD%d", &build);
2800 if (e == 1)
2801 ctx->xvid_build = build;
2802
2803 return 0;
2804 }
2805
ff_mpeg4_workaround_bugs(AVCodecContext * avctx)2806 int ff_mpeg4_workaround_bugs(AVCodecContext *avctx)
2807 {
2808 Mpeg4DecContext *ctx = avctx->priv_data;
2809 MpegEncContext *s = &ctx->m;
2810
2811 if (ctx->xvid_build == -1 && ctx->divx_version == -1 && ctx->lavc_build == -1) {
2812 if (s->codec_tag == AV_RL32("XVID") ||
2813 s->codec_tag == AV_RL32("XVIX") ||
2814 s->codec_tag == AV_RL32("RMP4") ||
2815 s->codec_tag == AV_RL32("ZMP4") ||
2816 s->codec_tag == AV_RL32("SIPP"))
2817 ctx->xvid_build = 0;
2818 }
2819
2820 if (ctx->xvid_build == -1 && ctx->divx_version == -1 && ctx->lavc_build == -1)
2821 if (s->codec_tag == AV_RL32("DIVX") && ctx->vo_type == 0 &&
2822 ctx->vol_control_parameters == 0)
2823 ctx->divx_version = 400; // divx 4
2824
2825 if (ctx->xvid_build >= 0 && ctx->divx_version >= 0) {
2826 ctx->divx_version =
2827 ctx->divx_build = -1;
2828 }
2829
2830 if (s->workaround_bugs & FF_BUG_AUTODETECT) {
2831 if (s->codec_tag == AV_RL32("XVIX"))
2832 s->workaround_bugs |= FF_BUG_XVID_ILACE;
2833
2834 if (s->codec_tag == AV_RL32("UMP4"))
2835 s->workaround_bugs |= FF_BUG_UMP4;
2836
2837 if (ctx->divx_version >= 500 && ctx->divx_build < 1814)
2838 s->workaround_bugs |= FF_BUG_QPEL_CHROMA;
2839
2840 if (ctx->divx_version > 502 && ctx->divx_build < 1814)
2841 s->workaround_bugs |= FF_BUG_QPEL_CHROMA2;
2842
2843 if (ctx->xvid_build <= 3U)
2844 s->padding_bug_score = 256 * 256 * 256 * 64;
2845
2846 if (ctx->xvid_build <= 1U)
2847 s->workaround_bugs |= FF_BUG_QPEL_CHROMA;
2848
2849 if (ctx->xvid_build <= 12U)
2850 s->workaround_bugs |= FF_BUG_EDGE;
2851
2852 if (ctx->xvid_build <= 32U)
2853 s->workaround_bugs |= FF_BUG_DC_CLIP;
2854
2855 #define SET_QPEL_FUNC(postfix1, postfix2) \
2856 s->qdsp.put_ ## postfix1 = ff_put_ ## postfix2; \
2857 s->qdsp.put_no_rnd_ ## postfix1 = ff_put_no_rnd_ ## postfix2; \
2858 s->qdsp.avg_ ## postfix1 = ff_avg_ ## postfix2;
2859
2860 if (ctx->lavc_build < 4653U)
2861 s->workaround_bugs |= FF_BUG_STD_QPEL;
2862
2863 if (ctx->lavc_build < 4655U)
2864 s->workaround_bugs |= FF_BUG_DIRECT_BLOCKSIZE;
2865
2866 if (ctx->lavc_build < 4670U)
2867 s->workaround_bugs |= FF_BUG_EDGE;
2868
2869 if (ctx->lavc_build <= 4712U)
2870 s->workaround_bugs |= FF_BUG_DC_CLIP;
2871
2872 if ((ctx->lavc_build&0xFF) >= 100) {
2873 if (ctx->lavc_build > 3621476 && ctx->lavc_build < 3752552 &&
2874 (ctx->lavc_build < 3752037 || ctx->lavc_build > 3752191) // 3.2.1+
2875 )
2876 s->workaround_bugs |= FF_BUG_IEDGE;
2877 }
2878
2879 if (ctx->divx_version >= 0)
2880 s->workaround_bugs |= FF_BUG_DIRECT_BLOCKSIZE;
2881 if (ctx->divx_version == 501 && ctx->divx_build == 20020416)
2882 s->padding_bug_score = 256 * 256 * 256 * 64;
2883
2884 if (ctx->divx_version < 500U)
2885 s->workaround_bugs |= FF_BUG_EDGE;
2886
2887 if (ctx->divx_version >= 0)
2888 s->workaround_bugs |= FF_BUG_HPEL_CHROMA;
2889 }
2890
2891 if (s->workaround_bugs & FF_BUG_STD_QPEL) {
2892 SET_QPEL_FUNC(qpel_pixels_tab[0][5], qpel16_mc11_old_c)
2893 SET_QPEL_FUNC(qpel_pixels_tab[0][7], qpel16_mc31_old_c)
2894 SET_QPEL_FUNC(qpel_pixels_tab[0][9], qpel16_mc12_old_c)
2895 SET_QPEL_FUNC(qpel_pixels_tab[0][11], qpel16_mc32_old_c)
2896 SET_QPEL_FUNC(qpel_pixels_tab[0][13], qpel16_mc13_old_c)
2897 SET_QPEL_FUNC(qpel_pixels_tab[0][15], qpel16_mc33_old_c)
2898
2899 SET_QPEL_FUNC(qpel_pixels_tab[1][5], qpel8_mc11_old_c)
2900 SET_QPEL_FUNC(qpel_pixels_tab[1][7], qpel8_mc31_old_c)
2901 SET_QPEL_FUNC(qpel_pixels_tab[1][9], qpel8_mc12_old_c)
2902 SET_QPEL_FUNC(qpel_pixels_tab[1][11], qpel8_mc32_old_c)
2903 SET_QPEL_FUNC(qpel_pixels_tab[1][13], qpel8_mc13_old_c)
2904 SET_QPEL_FUNC(qpel_pixels_tab[1][15], qpel8_mc33_old_c)
2905 }
2906
2907 if (avctx->debug & FF_DEBUG_BUGS)
2908 av_log(s->avctx, AV_LOG_DEBUG,
2909 "bugs: %X lavc_build:%d xvid_build:%d divx_version:%d divx_build:%d %s\n",
2910 s->workaround_bugs, ctx->lavc_build, ctx->xvid_build,
2911 ctx->divx_version, ctx->divx_build, s->divx_packed ? "p" : "");
2912
2913 if (CONFIG_MPEG4_DECODER && ctx->xvid_build >= 0 &&
2914 s->codec_id == AV_CODEC_ID_MPEG4 &&
2915 avctx->idct_algo == FF_IDCT_AUTO) {
2916 avctx->idct_algo = FF_IDCT_XVID;
2917 ff_mpv_idct_init(s);
2918 return 1;
2919 }
2920
2921 return 0;
2922 }
2923
decode_vop_header(Mpeg4DecContext * ctx,GetBitContext * gb,int parse_only)2924 static int decode_vop_header(Mpeg4DecContext *ctx, GetBitContext *gb,
2925 int parse_only)
2926 {
2927 MpegEncContext *s = &ctx->m;
2928 int time_incr, time_increment;
2929 int64_t pts;
2930
2931 s->mcsel = 0;
2932 s->pict_type = get_bits(gb, 2) + AV_PICTURE_TYPE_I; /* pict type: I = 0 , P = 1 */
2933 if (s->pict_type == AV_PICTURE_TYPE_B && s->low_delay &&
2934 ctx->vol_control_parameters == 0 && !(s->avctx->flags & AV_CODEC_FLAG_LOW_DELAY)) {
2935 av_log(s->avctx, AV_LOG_ERROR, "low_delay flag set incorrectly, clearing it\n");
2936 s->low_delay = 0;
2937 }
2938
2939 s->partitioned_frame = s->data_partitioning && s->pict_type != AV_PICTURE_TYPE_B;
2940 if (s->partitioned_frame)
2941 s->decode_mb = mpeg4_decode_partitioned_mb;
2942 else
2943 s->decode_mb = mpeg4_decode_mb;
2944
2945 time_incr = 0;
2946 while (get_bits1(gb) != 0)
2947 time_incr++;
2948
2949 check_marker(s->avctx, gb, "before time_increment");
2950
2951 if (ctx->time_increment_bits == 0 ||
2952 !(show_bits(gb, ctx->time_increment_bits + 1) & 1)) {
2953 av_log(s->avctx, AV_LOG_WARNING,
2954 "time_increment_bits %d is invalid in relation to the current bitstream, this is likely caused by a missing VOL header\n", ctx->time_increment_bits);
2955
2956 for (ctx->time_increment_bits = 1;
2957 ctx->time_increment_bits < 16;
2958 ctx->time_increment_bits++) {
2959 if (s->pict_type == AV_PICTURE_TYPE_P ||
2960 (s->pict_type == AV_PICTURE_TYPE_S &&
2961 ctx->vol_sprite_usage == GMC_SPRITE)) {
2962 if ((show_bits(gb, ctx->time_increment_bits + 6) & 0x37) == 0x30)
2963 break;
2964 } else if ((show_bits(gb, ctx->time_increment_bits + 5) & 0x1F) == 0x18)
2965 break;
2966 }
2967
2968 av_log(s->avctx, AV_LOG_WARNING,
2969 "time_increment_bits set to %d bits, based on bitstream analysis\n", ctx->time_increment_bits);
2970 if (s->avctx->framerate.num && 4*s->avctx->framerate.num < 1<<ctx->time_increment_bits) {
2971 s->avctx->framerate.num = 1<<ctx->time_increment_bits;
2972 s->avctx->time_base = av_inv_q(av_mul_q(s->avctx->framerate, (AVRational){s->avctx->ticks_per_frame, 1}));
2973 }
2974 }
2975
2976 if (IS_3IV1)
2977 time_increment = get_bits1(gb); // FIXME investigate further
2978 else
2979 time_increment = get_bits(gb, ctx->time_increment_bits);
2980
2981 if (s->pict_type != AV_PICTURE_TYPE_B) {
2982 s->last_time_base = s->time_base;
2983 s->time_base += time_incr;
2984 s->time = s->time_base * (int64_t)s->avctx->framerate.num + time_increment;
2985 if (s->workaround_bugs & FF_BUG_UMP4) {
2986 if (s->time < s->last_non_b_time) {
2987 /* header is not mpeg-4-compatible, broken encoder,
2988 * trying to workaround */
2989 s->time_base++;
2990 s->time += s->avctx->framerate.num;
2991 }
2992 }
2993 s->pp_time = s->time - s->last_non_b_time;
2994 s->last_non_b_time = s->time;
2995 } else {
2996 s->time = (s->last_time_base + time_incr) * (int64_t)s->avctx->framerate.num + time_increment;
2997 s->pb_time = s->pp_time - (s->last_non_b_time - s->time);
2998 if (s->pp_time <= s->pb_time ||
2999 s->pp_time <= s->pp_time - s->pb_time ||
3000 s->pp_time <= 0) {
3001 /* messed up order, maybe after seeking? skipping current B-frame */
3002 return FRAME_SKIPPED;
3003 }
3004 ff_mpeg4_init_direct_mv(s);
3005
3006 if (ctx->t_frame == 0)
3007 ctx->t_frame = s->pb_time;
3008 if (ctx->t_frame == 0)
3009 ctx->t_frame = 1; // 1/0 protection
3010 s->pp_field_time = (ROUNDED_DIV(s->last_non_b_time, ctx->t_frame) -
3011 ROUNDED_DIV(s->last_non_b_time - s->pp_time, ctx->t_frame)) * 2;
3012 s->pb_field_time = (ROUNDED_DIV(s->time, ctx->t_frame) -
3013 ROUNDED_DIV(s->last_non_b_time - s->pp_time, ctx->t_frame)) * 2;
3014 if (s->pp_field_time <= s->pb_field_time || s->pb_field_time <= 1) {
3015 s->pb_field_time = 2;
3016 s->pp_field_time = 4;
3017 if (!s->progressive_sequence)
3018 return FRAME_SKIPPED;
3019 }
3020 }
3021
3022 if (s->avctx->framerate.den)
3023 pts = ROUNDED_DIV(s->time, s->avctx->framerate.den);
3024 else
3025 pts = AV_NOPTS_VALUE;
3026 ff_dlog(s->avctx, "MPEG4 PTS: %"PRId64"\n", pts);
3027
3028 check_marker(s->avctx, gb, "before vop_coded");
3029
3030 /* vop coded */
3031 if (get_bits1(gb) != 1) {
3032 if (s->avctx->debug & FF_DEBUG_PICT_INFO)
3033 av_log(s->avctx, AV_LOG_ERROR, "vop not coded\n");
3034 return FRAME_SKIPPED;
3035 }
3036 if (ctx->new_pred)
3037 decode_new_pred(ctx, gb);
3038
3039 if (ctx->shape != BIN_ONLY_SHAPE &&
3040 (s->pict_type == AV_PICTURE_TYPE_P ||
3041 (s->pict_type == AV_PICTURE_TYPE_S &&
3042 ctx->vol_sprite_usage == GMC_SPRITE))) {
3043 /* rounding type for motion estimation */
3044 s->no_rounding = get_bits1(gb);
3045 } else {
3046 s->no_rounding = 0;
3047 }
3048 // FIXME reduced res stuff
3049
3050 if (ctx->shape != RECT_SHAPE) {
3051 if (ctx->vol_sprite_usage != 1 || s->pict_type != AV_PICTURE_TYPE_I) {
3052 skip_bits(gb, 13); /* width */
3053 check_marker(s->avctx, gb, "after width");
3054 skip_bits(gb, 13); /* height */
3055 check_marker(s->avctx, gb, "after height");
3056 skip_bits(gb, 13); /* hor_spat_ref */
3057 check_marker(s->avctx, gb, "after hor_spat_ref");
3058 skip_bits(gb, 13); /* ver_spat_ref */
3059 }
3060 skip_bits1(gb); /* change_CR_disable */
3061
3062 if (get_bits1(gb) != 0)
3063 skip_bits(gb, 8); /* constant_alpha_value */
3064 }
3065
3066 // FIXME complexity estimation stuff
3067
3068 if (ctx->shape != BIN_ONLY_SHAPE) {
3069 skip_bits_long(gb, ctx->cplx_estimation_trash_i);
3070 if (s->pict_type != AV_PICTURE_TYPE_I)
3071 skip_bits_long(gb, ctx->cplx_estimation_trash_p);
3072 if (s->pict_type == AV_PICTURE_TYPE_B)
3073 skip_bits_long(gb, ctx->cplx_estimation_trash_b);
3074
3075 if (get_bits_left(gb) < 3) {
3076 av_log(s->avctx, AV_LOG_ERROR, "Header truncated\n");
3077 return AVERROR_INVALIDDATA;
3078 }
3079 ctx->intra_dc_threshold = ff_mpeg4_dc_threshold[get_bits(gb, 3)];
3080 if (!s->progressive_sequence) {
3081 s->top_field_first = get_bits1(gb);
3082 s->alternate_scan = get_bits1(gb);
3083 } else
3084 s->alternate_scan = 0;
3085 }
3086
3087 if (s->alternate_scan) {
3088 ff_init_scantable(s->idsp.idct_permutation, &s->inter_scantable, ff_alternate_vertical_scan);
3089 ff_init_scantable(s->idsp.idct_permutation, &s->intra_scantable, ff_alternate_vertical_scan);
3090 ff_init_scantable(s->idsp.idct_permutation, &s->intra_h_scantable, ff_alternate_vertical_scan);
3091 ff_init_scantable(s->idsp.idct_permutation, &s->intra_v_scantable, ff_alternate_vertical_scan);
3092 } else {
3093 ff_init_scantable(s->idsp.idct_permutation, &s->inter_scantable, ff_zigzag_direct);
3094 ff_init_scantable(s->idsp.idct_permutation, &s->intra_scantable, ff_zigzag_direct);
3095 ff_init_scantable(s->idsp.idct_permutation, &s->intra_h_scantable, ff_alternate_horizontal_scan);
3096 ff_init_scantable(s->idsp.idct_permutation, &s->intra_v_scantable, ff_alternate_vertical_scan);
3097 }
3098
3099 /* Skip at this point when only parsing since the remaining
3100 * data is not useful for a parser and requires the
3101 * sprite_trajectory VLC to be initialized. */
3102 if (parse_only)
3103 goto end;
3104
3105 if (s->pict_type == AV_PICTURE_TYPE_S) {
3106 if((ctx->vol_sprite_usage == STATIC_SPRITE ||
3107 ctx->vol_sprite_usage == GMC_SPRITE)) {
3108 if (mpeg4_decode_sprite_trajectory(ctx, gb) < 0)
3109 return AVERROR_INVALIDDATA;
3110 if (ctx->sprite_brightness_change)
3111 av_log(s->avctx, AV_LOG_ERROR,
3112 "sprite_brightness_change not supported\n");
3113 if (ctx->vol_sprite_usage == STATIC_SPRITE)
3114 av_log(s->avctx, AV_LOG_ERROR, "static sprite not supported\n");
3115 } else {
3116 memset(s->sprite_offset, 0, sizeof(s->sprite_offset));
3117 memset(s->sprite_delta, 0, sizeof(s->sprite_delta));
3118 }
3119 }
3120
3121 if (ctx->shape != BIN_ONLY_SHAPE) {
3122 s->chroma_qscale = s->qscale = get_bits(gb, s->quant_precision);
3123 if (s->qscale == 0) {
3124 av_log(s->avctx, AV_LOG_ERROR,
3125 "Error, header damaged or not MPEG-4 header (qscale=0)\n");
3126 return AVERROR_INVALIDDATA; // makes no sense to continue, as there is nothing left from the image then
3127 }
3128
3129 if (s->pict_type != AV_PICTURE_TYPE_I) {
3130 s->f_code = get_bits(gb, 3); /* fcode_for */
3131 if (s->f_code == 0) {
3132 av_log(s->avctx, AV_LOG_ERROR,
3133 "Error, header damaged or not MPEG-4 header (f_code=0)\n");
3134 s->f_code = 1;
3135 return AVERROR_INVALIDDATA; // makes no sense to continue, as there is nothing left from the image then
3136 }
3137 } else
3138 s->f_code = 1;
3139
3140 if (s->pict_type == AV_PICTURE_TYPE_B) {
3141 s->b_code = get_bits(gb, 3);
3142 if (s->b_code == 0) {
3143 av_log(s->avctx, AV_LOG_ERROR,
3144 "Error, header damaged or not MPEG4 header (b_code=0)\n");
3145 s->b_code=1;
3146 return AVERROR_INVALIDDATA; // makes no sense to continue, as the MV decoding will break very quickly
3147 }
3148 } else
3149 s->b_code = 1;
3150
3151 if (s->avctx->debug & FF_DEBUG_PICT_INFO) {
3152 av_log(s->avctx, AV_LOG_DEBUG,
3153 "qp:%d fc:%d,%d %c size:%d pro:%d alt:%d top:%d %cpel part:%d resync:%d w:%d a:%d rnd:%d vot:%d%s dc:%d ce:%d/%d/%d time:%"PRId64" tincr:%d\n",
3154 s->qscale, s->f_code, s->b_code,
3155 s->pict_type == AV_PICTURE_TYPE_I ? 'I' : (s->pict_type == AV_PICTURE_TYPE_P ? 'P' : (s->pict_type == AV_PICTURE_TYPE_B ? 'B' : 'S')),
3156 gb->size_in_bits,s->progressive_sequence, s->alternate_scan,
3157 s->top_field_first, s->quarter_sample ? 'q' : 'h',
3158 s->data_partitioning, ctx->resync_marker,
3159 ctx->num_sprite_warping_points, s->sprite_warping_accuracy,
3160 1 - s->no_rounding, ctx->vo_type,
3161 ctx->vol_control_parameters ? " VOLC" : " ", ctx->intra_dc_threshold,
3162 ctx->cplx_estimation_trash_i, ctx->cplx_estimation_trash_p,
3163 ctx->cplx_estimation_trash_b,
3164 s->time,
3165 time_increment
3166 );
3167 }
3168
3169 if (!ctx->scalability) {
3170 if (ctx->shape != RECT_SHAPE && s->pict_type != AV_PICTURE_TYPE_I)
3171 skip_bits1(gb); // vop shape coding type
3172 } else {
3173 if (ctx->enhancement_type) {
3174 int load_backward_shape = get_bits1(gb);
3175 if (load_backward_shape)
3176 av_log(s->avctx, AV_LOG_ERROR,
3177 "load backward shape isn't supported\n");
3178 }
3179 skip_bits(gb, 2); // ref_select_code
3180 }
3181 }
3182
3183 end:
3184 /* detect buggy encoders which don't set the low_delay flag
3185 * (divx4/xvid/opendivx). Note we cannot detect divx5 without B-frames
3186 * easily (although it's buggy too) */
3187 if (ctx->vo_type == 0 && ctx->vol_control_parameters == 0 &&
3188 ctx->divx_version == -1 && s->picture_number == 0) {
3189 av_log(s->avctx, AV_LOG_WARNING,
3190 "looks like this file was encoded with (divx4/(old)xvid/opendivx) -> forcing low_delay flag\n");
3191 s->low_delay = 1;
3192 }
3193
3194 s->picture_number++; // better than pic number==0 always ;)
3195
3196 // FIXME add short header support
3197 s->y_dc_scale_table = ff_mpeg4_y_dc_scale_table;
3198 s->c_dc_scale_table = ff_mpeg4_c_dc_scale_table;
3199
3200 if (s->workaround_bugs & FF_BUG_EDGE) {
3201 s->h_edge_pos = s->width;
3202 s->v_edge_pos = s->height;
3203 }
3204 return 0;
3205 }
3206
decode_smpte_tc(Mpeg4DecContext * ctx,GetBitContext * gb)3207 static void decode_smpte_tc(Mpeg4DecContext *ctx, GetBitContext *gb)
3208 {
3209 MpegEncContext *s = &ctx->m;
3210
3211 skip_bits(gb, 16); /* Time_code[63..48] */
3212 check_marker(s->avctx, gb, "after Time_code[63..48]");
3213 skip_bits(gb, 16); /* Time_code[47..32] */
3214 check_marker(s->avctx, gb, "after Time_code[47..32]");
3215 skip_bits(gb, 16); /* Time_code[31..16] */
3216 check_marker(s->avctx, gb, "after Time_code[31..16]");
3217 skip_bits(gb, 16); /* Time_code[15..0] */
3218 check_marker(s->avctx, gb, "after Time_code[15..0]");
3219 skip_bits(gb, 4); /* reserved_bits */
3220 }
3221
3222 /**
3223 * Decode the next studio vop header.
3224 * @return <0 if something went wrong
3225 */
decode_studio_vop_header(Mpeg4DecContext * ctx,GetBitContext * gb)3226 static int decode_studio_vop_header(Mpeg4DecContext *ctx, GetBitContext *gb)
3227 {
3228 MpegEncContext *s = &ctx->m;
3229
3230 if (get_bits_left(gb) <= 32)
3231 return 0;
3232
3233 s->partitioned_frame = 0;
3234 s->interlaced_dct = 0;
3235 s->decode_mb = mpeg4_decode_studio_mb;
3236
3237 decode_smpte_tc(ctx, gb);
3238
3239 skip_bits(gb, 10); /* temporal_reference */
3240 skip_bits(gb, 2); /* vop_structure */
3241 s->pict_type = get_bits(gb, 2) + AV_PICTURE_TYPE_I; /* vop_coding_type */
3242 if (get_bits1(gb)) { /* vop_coded */
3243 skip_bits1(gb); /* top_field_first */
3244 skip_bits1(gb); /* repeat_first_field */
3245 s->progressive_frame = get_bits1(gb) ^ 1; /* progressive_frame */
3246 }
3247
3248 if (s->pict_type == AV_PICTURE_TYPE_I) {
3249 if (get_bits1(gb))
3250 reset_studio_dc_predictors(s);
3251 }
3252
3253 if (ctx->shape != BIN_ONLY_SHAPE) {
3254 s->alternate_scan = get_bits1(gb);
3255 s->frame_pred_frame_dct = get_bits1(gb);
3256 s->dct_precision = get_bits(gb, 2);
3257 s->intra_dc_precision = get_bits(gb, 2);
3258 s->q_scale_type = get_bits1(gb);
3259 }
3260
3261 if (s->alternate_scan) {
3262 ff_init_scantable(s->idsp.idct_permutation, &s->inter_scantable, ff_alternate_vertical_scan);
3263 ff_init_scantable(s->idsp.idct_permutation, &s->intra_scantable, ff_alternate_vertical_scan);
3264 ff_init_scantable(s->idsp.idct_permutation, &s->intra_h_scantable, ff_alternate_vertical_scan);
3265 ff_init_scantable(s->idsp.idct_permutation, &s->intra_v_scantable, ff_alternate_vertical_scan);
3266 } else {
3267 ff_init_scantable(s->idsp.idct_permutation, &s->inter_scantable, ff_zigzag_direct);
3268 ff_init_scantable(s->idsp.idct_permutation, &s->intra_scantable, ff_zigzag_direct);
3269 ff_init_scantable(s->idsp.idct_permutation, &s->intra_h_scantable, ff_alternate_horizontal_scan);
3270 ff_init_scantable(s->idsp.idct_permutation, &s->intra_v_scantable, ff_alternate_vertical_scan);
3271 }
3272
3273 mpeg4_load_default_matrices(s);
3274
3275 next_start_code_studio(gb);
3276 extension_and_user_data(s, gb, 4);
3277
3278 return 0;
3279 }
3280
decode_studiovisualobject(Mpeg4DecContext * ctx,GetBitContext * gb)3281 static int decode_studiovisualobject(Mpeg4DecContext *ctx, GetBitContext *gb)
3282 {
3283 MpegEncContext *s = &ctx->m;
3284 int visual_object_type;
3285
3286 skip_bits(gb, 4); /* visual_object_verid */
3287 visual_object_type = get_bits(gb, 4);
3288 if (visual_object_type != VOT_VIDEO_ID) {
3289 avpriv_request_sample(s->avctx, "VO type %u", visual_object_type);
3290 return AVERROR_PATCHWELCOME;
3291 }
3292
3293 next_start_code_studio(gb);
3294 extension_and_user_data(s, gb, 1);
3295
3296 return 0;
3297 }
3298
3299 /**
3300 * Decode MPEG-4 headers.
3301 *
3302 * @param header If set the absence of a VOP is not treated as error; otherwise, it is treated as such.
3303 * @param parse_only If set, things only relevant to a decoder may be skipped;
3304 * furthermore, the VLC tables may be uninitialized.
3305 * @return <0 if an error occurred
3306 * FRAME_SKIPPED if a not coded VOP is found
3307 * 0 else
3308 */
ff_mpeg4_decode_picture_header(Mpeg4DecContext * ctx,GetBitContext * gb,int header,int parse_only)3309 int ff_mpeg4_decode_picture_header(Mpeg4DecContext *ctx, GetBitContext *gb,
3310 int header, int parse_only)
3311 {
3312 MpegEncContext *s = &ctx->m;
3313 unsigned startcode, v;
3314 int ret;
3315 int vol = 0;
3316
3317 /* search next start code */
3318 align_get_bits(gb);
3319
3320 // If we have not switched to studio profile than we also did not switch bps
3321 // that means something else (like a previous instance) outside set bps which
3322 // would be inconsistant with the currect state, thus reset it
3323 if (!s->studio_profile && s->avctx->bits_per_raw_sample != 8)
3324 s->avctx->bits_per_raw_sample = 0;
3325
3326 if (s->codec_tag == AV_RL32("WV1F") && show_bits(gb, 24) == 0x575630) {
3327 skip_bits(gb, 24);
3328 if (get_bits(gb, 8) == 0xF0)
3329 goto end;
3330 }
3331
3332 startcode = 0xff;
3333 for (;;) {
3334 if (get_bits_count(gb) >= gb->size_in_bits) {
3335 if (gb->size_in_bits == 8 &&
3336 (ctx->divx_version >= 0 || ctx->xvid_build >= 0) || s->codec_tag == AV_RL32("QMP4")) {
3337 av_log(s->avctx, AV_LOG_VERBOSE, "frame skip %d\n", gb->size_in_bits);
3338 return FRAME_SKIPPED; // divx bug
3339 } else if (header && get_bits_count(gb) == gb->size_in_bits) {
3340 return 0; // ordinary return value for parsing of extradata
3341 } else
3342 return AVERROR_INVALIDDATA; // end of stream
3343 }
3344
3345 /* use the bits after the test */
3346 v = get_bits(gb, 8);
3347 startcode = ((startcode << 8) | v) & 0xffffffff;
3348
3349 if ((startcode & 0xFFFFFF00) != 0x100)
3350 continue; // no startcode
3351
3352 if (s->avctx->debug & FF_DEBUG_STARTCODE) {
3353 const char *name;
3354 if (startcode <= 0x11F)
3355 name = "Video Object Start";
3356 else if (startcode <= 0x12F)
3357 name = "Video Object Layer Start";
3358 else if (startcode <= 0x13F)
3359 name = "Reserved";
3360 else if (startcode <= 0x15F)
3361 name = "FGS bp start";
3362 else if (startcode <= 0x1AF)
3363 name = "Reserved";
3364 else if (startcode == 0x1B0)
3365 name = "Visual Object Seq Start";
3366 else if (startcode == 0x1B1)
3367 name = "Visual Object Seq End";
3368 else if (startcode == 0x1B2)
3369 name = "User Data";
3370 else if (startcode == 0x1B3)
3371 name = "Group of VOP start";
3372 else if (startcode == 0x1B4)
3373 name = "Video Session Error";
3374 else if (startcode == 0x1B5)
3375 name = "Visual Object Start";
3376 else if (startcode == 0x1B6)
3377 name = "Video Object Plane start";
3378 else if (startcode == 0x1B7)
3379 name = "slice start";
3380 else if (startcode == 0x1B8)
3381 name = "extension start";
3382 else if (startcode == 0x1B9)
3383 name = "fgs start";
3384 else if (startcode == 0x1BA)
3385 name = "FBA Object start";
3386 else if (startcode == 0x1BB)
3387 name = "FBA Object Plane start";
3388 else if (startcode == 0x1BC)
3389 name = "Mesh Object start";
3390 else if (startcode == 0x1BD)
3391 name = "Mesh Object Plane start";
3392 else if (startcode == 0x1BE)
3393 name = "Still Texture Object start";
3394 else if (startcode == 0x1BF)
3395 name = "Texture Spatial Layer start";
3396 else if (startcode == 0x1C0)
3397 name = "Texture SNR Layer start";
3398 else if (startcode == 0x1C1)
3399 name = "Texture Tile start";
3400 else if (startcode == 0x1C2)
3401 name = "Texture Shape Layer start";
3402 else if (startcode == 0x1C3)
3403 name = "stuffing start";
3404 else if (startcode <= 0x1C5)
3405 name = "Reserved";
3406 else if (startcode <= 0x1FF)
3407 name = "System start";
3408 av_log(s->avctx, AV_LOG_DEBUG, "startcode: %3X %s at %d\n",
3409 startcode, name, get_bits_count(gb));
3410 }
3411
3412 if (startcode >= 0x120 && startcode <= 0x12F) {
3413 if (vol) {
3414 av_log(s->avctx, AV_LOG_WARNING, "Ignoring multiple VOL headers\n");
3415 continue;
3416 }
3417 vol++;
3418 if ((ret = decode_vol_header(ctx, gb)) < 0)
3419 return ret;
3420 } else if (startcode == USER_DATA_STARTCODE) {
3421 decode_user_data(ctx, gb);
3422 } else if (startcode == GOP_STARTCODE) {
3423 mpeg4_decode_gop_header(s, gb);
3424 } else if (startcode == VOS_STARTCODE) {
3425 int profile, level;
3426 mpeg4_decode_profile_level(s, gb, &profile, &level);
3427 if (profile == FF_PROFILE_MPEG4_SIMPLE_STUDIO &&
3428 (level > 0 && level < 9)) {
3429 s->studio_profile = 1;
3430 next_start_code_studio(gb);
3431 extension_and_user_data(s, gb, 0);
3432 } else if (s->studio_profile) {
3433 avpriv_request_sample(s->avctx, "Mix of studio and non studio profile");
3434 return AVERROR_PATCHWELCOME;
3435 }
3436 s->avctx->profile = profile;
3437 s->avctx->level = level;
3438 } else if (startcode == VISUAL_OBJ_STARTCODE) {
3439 if (s->studio_profile) {
3440 if ((ret = decode_studiovisualobject(ctx, gb)) < 0)
3441 return ret;
3442 } else
3443 mpeg4_decode_visual_object(s, gb);
3444 } else if (startcode == VOP_STARTCODE) {
3445 break;
3446 }
3447
3448 align_get_bits(gb);
3449 startcode = 0xff;
3450 }
3451
3452 end:
3453 if (s->avctx->flags & AV_CODEC_FLAG_LOW_DELAY)
3454 s->low_delay = 1;
3455 s->avctx->has_b_frames = !s->low_delay;
3456
3457 if (s->studio_profile) {
3458 if (!s->avctx->bits_per_raw_sample) {
3459 av_log(s->avctx, AV_LOG_ERROR, "Missing VOL header\n");
3460 return AVERROR_INVALIDDATA;
3461 }
3462 return decode_studio_vop_header(ctx, gb);
3463 } else
3464 return decode_vop_header(ctx, gb, parse_only);
3465 }
3466
ff_mpeg4_frame_end(AVCodecContext * avctx,const uint8_t * buf,int buf_size)3467 int ff_mpeg4_frame_end(AVCodecContext *avctx, const uint8_t *buf, int buf_size)
3468 {
3469 Mpeg4DecContext *ctx = avctx->priv_data;
3470 MpegEncContext *s = &ctx->m;
3471
3472 /* divx 5.01+ bitstream reorder stuff */
3473 /* Since this clobbers the input buffer and hwaccel codecs still need the
3474 * data during hwaccel->end_frame we should not do this any earlier */
3475 if (s->divx_packed) {
3476 int current_pos = s->gb.buffer == s->bitstream_buffer ? 0 : (get_bits_count(&s->gb) >> 3);
3477 int startcode_found = 0;
3478
3479 if (buf_size - current_pos > 7) {
3480
3481 int i;
3482 for (i = current_pos; i < buf_size - 4; i++)
3483
3484 if (buf[i] == 0 &&
3485 buf[i + 1] == 0 &&
3486 buf[i + 2] == 1 &&
3487 buf[i + 3] == 0xB6) {
3488 startcode_found = !(buf[i + 4] & 0x40);
3489 break;
3490 }
3491 }
3492
3493 if (startcode_found) {
3494 if (!ctx->showed_packed_warning) {
3495 av_log(s->avctx, AV_LOG_INFO, "Video uses a non-standard and "
3496 "wasteful way to store B-frames ('packed B-frames'). "
3497 "Consider using the mpeg4_unpack_bframes bitstream filter without encoding but stream copy to fix it.\n");
3498 ctx->showed_packed_warning = 1;
3499 }
3500 av_fast_padded_malloc(&s->bitstream_buffer,
3501 &s->allocated_bitstream_buffer_size,
3502 buf_size - current_pos);
3503 if (!s->bitstream_buffer) {
3504 s->bitstream_buffer_size = 0;
3505 return AVERROR(ENOMEM);
3506 }
3507 memcpy(s->bitstream_buffer, buf + current_pos,
3508 buf_size - current_pos);
3509 s->bitstream_buffer_size = buf_size - current_pos;
3510 }
3511 }
3512
3513 return 0;
3514 }
3515
3516 #if HAVE_THREADS
mpeg4_update_thread_context(AVCodecContext * dst,const AVCodecContext * src)3517 static int mpeg4_update_thread_context(AVCodecContext *dst,
3518 const AVCodecContext *src)
3519 {
3520 Mpeg4DecContext *s = dst->priv_data;
3521 const Mpeg4DecContext *s1 = src->priv_data;
3522 int init = s->m.context_initialized;
3523
3524 int ret = ff_mpeg_update_thread_context(dst, src);
3525
3526 if (ret < 0)
3527 return ret;
3528
3529 // copy all the necessary fields explicitly
3530 s->time_increment_bits = s1->time_increment_bits;
3531 s->shape = s1->shape;
3532 s->vol_sprite_usage = s1->vol_sprite_usage;
3533 s->sprite_brightness_change = s1->sprite_brightness_change;
3534 s->num_sprite_warping_points = s1->num_sprite_warping_points;
3535 s->rvlc = s1->rvlc;
3536 s->resync_marker = s1->resync_marker;
3537 s->t_frame = s1->t_frame;
3538 s->new_pred = s1->new_pred;
3539 s->enhancement_type = s1->enhancement_type;
3540 s->scalability = s1->scalability;
3541 s->intra_dc_threshold = s1->intra_dc_threshold;
3542 s->divx_version = s1->divx_version;
3543 s->divx_build = s1->divx_build;
3544 s->xvid_build = s1->xvid_build;
3545 s->lavc_build = s1->lavc_build;
3546 s->vo_type = s1->vo_type;
3547 s->showed_packed_warning = s1->showed_packed_warning;
3548 s->vol_control_parameters = s1->vol_control_parameters;
3549 s->cplx_estimation_trash_i = s1->cplx_estimation_trash_i;
3550 s->cplx_estimation_trash_p = s1->cplx_estimation_trash_p;
3551 s->cplx_estimation_trash_b = s1->cplx_estimation_trash_b;
3552 s->rgb = s1->rgb;
3553
3554 memcpy(s->sprite_shift, s1->sprite_shift, sizeof(s1->sprite_shift));
3555 memcpy(s->sprite_traj, s1->sprite_traj, sizeof(s1->sprite_traj));
3556
3557 if (CONFIG_MPEG4_DECODER && !init && s1->xvid_build >= 0)
3558 ff_xvid_idct_init(&s->m.idsp, dst);
3559
3560 return 0;
3561 }
3562
mpeg4_update_thread_context_for_user(AVCodecContext * dst,const AVCodecContext * src)3563 static int mpeg4_update_thread_context_for_user(AVCodecContext *dst,
3564 const AVCodecContext *src)
3565 {
3566 MpegEncContext *m = dst->priv_data;
3567 const MpegEncContext *m1 = src->priv_data;
3568
3569 m->quarter_sample = m1->quarter_sample;
3570 m->divx_packed = m1->divx_packed;
3571
3572 return 0;
3573 }
3574 #endif
3575
mpeg4_init_static(void)3576 static av_cold void mpeg4_init_static(void)
3577 {
3578 static uint8_t mpeg4_rvlc_rl_tables[2][2][2 * MAX_RUN + MAX_LEVEL + 3];
3579
3580 INIT_VLC_STATIC_FROM_LENGTHS(&studio_luma_dc, STUDIO_INTRA_BITS, 19,
3581 &ff_mpeg4_studio_dc_luma[0][1], 2,
3582 &ff_mpeg4_studio_dc_luma[0][0], 2, 1,
3583 0, 0, 528);
3584
3585 INIT_VLC_STATIC_FROM_LENGTHS(&studio_chroma_dc, STUDIO_INTRA_BITS, 19,
3586 &ff_mpeg4_studio_dc_chroma[0][1], 2,
3587 &ff_mpeg4_studio_dc_chroma[0][0], 2, 1,
3588 0, 0, 528);
3589
3590 for (unsigned i = 0, offset = 0; i < 12; i++) {
3591 static VLCElem vlc_buf[6498];
3592
3593 studio_intra_tab[i].table = &vlc_buf[offset];
3594 studio_intra_tab[i].table_allocated = FF_ARRAY_ELEMS(vlc_buf) - offset;
3595 ff_init_vlc_from_lengths(&studio_intra_tab[i],
3596 STUDIO_INTRA_BITS, 24,
3597 &ff_mpeg4_studio_intra[i][0][1], 2,
3598 &ff_mpeg4_studio_intra[i][0][0], 2, 1,
3599 0, INIT_VLC_STATIC_OVERLONG, NULL);
3600 offset += studio_intra_tab[i].table_size;
3601 }
3602
3603 ff_mpeg4_init_rl_intra();
3604 ff_rl_init(&ff_rvlc_rl_inter, mpeg4_rvlc_rl_tables[0]);
3605 ff_rl_init(&ff_rvlc_rl_intra, mpeg4_rvlc_rl_tables[1]);
3606 INIT_FIRST_VLC_RL(ff_mpeg4_rl_intra, 554);
3607 INIT_VLC_RL(ff_rvlc_rl_inter, 1072);
3608 INIT_FIRST_VLC_RL(ff_rvlc_rl_intra, 1072);
3609 INIT_VLC_STATIC(&dc_lum, DC_VLC_BITS, 10 /* 13 */,
3610 &ff_mpeg4_DCtab_lum[0][1], 2, 1,
3611 &ff_mpeg4_DCtab_lum[0][0], 2, 1, 512);
3612 INIT_VLC_STATIC(&dc_chrom, DC_VLC_BITS, 10 /* 13 */,
3613 &ff_mpeg4_DCtab_chrom[0][1], 2, 1,
3614 &ff_mpeg4_DCtab_chrom[0][0], 2, 1, 512);
3615 INIT_VLC_STATIC_FROM_LENGTHS(&sprite_trajectory, SPRITE_TRAJ_VLC_BITS, 15,
3616 ff_sprite_trajectory_lens, 1,
3617 NULL, 0, 0, 0, 0, 128);
3618 INIT_VLC_STATIC(&mb_type_b_vlc, MB_TYPE_B_VLC_BITS, 4,
3619 &ff_mb_type_b_tab[0][1], 2, 1,
3620 &ff_mb_type_b_tab[0][0], 2, 1, 16);
3621 }
3622
decode_init(AVCodecContext * avctx)3623 static av_cold int decode_init(AVCodecContext *avctx)
3624 {
3625 static AVOnce init_static_once = AV_ONCE_INIT;
3626 Mpeg4DecContext *ctx = avctx->priv_data;
3627 MpegEncContext *s = &ctx->m;
3628 int ret;
3629
3630 ctx->divx_version =
3631 ctx->divx_build =
3632 ctx->xvid_build =
3633 ctx->lavc_build = -1;
3634
3635 if ((ret = ff_h263_decode_init(avctx)) < 0)
3636 return ret;
3637
3638 s->h263_pred = 1;
3639 s->low_delay = 0; /* default, might be overridden in the vol header during header parsing */
3640 s->decode_mb = mpeg4_decode_mb;
3641 ctx->time_increment_bits = 4; /* default value for broken headers */
3642
3643 avctx->chroma_sample_location = AVCHROMA_LOC_LEFT;
3644
3645 ff_thread_once(&init_static_once, mpeg4_init_static);
3646
3647 return 0;
3648 }
3649
3650 #define OFFSET(x) offsetof(MpegEncContext, x)
3651 #define FLAGS AV_OPT_FLAG_EXPORT | AV_OPT_FLAG_READONLY
3652 static const AVOption mpeg4_options[] = {
3653 {"quarter_sample", "1/4 subpel MC", OFFSET(quarter_sample), AV_OPT_TYPE_BOOL, {.i64 = 0}, 0, 1, FLAGS},
3654 {"divx_packed", "divx style packed b frames", OFFSET(divx_packed), AV_OPT_TYPE_BOOL, {.i64 = 0}, 0, 1, FLAGS},
3655 {NULL}
3656 };
3657
3658 static const AVClass mpeg4_class = {
3659 .class_name = "MPEG4 Video Decoder",
3660 .item_name = av_default_item_name,
3661 .option = mpeg4_options,
3662 .version = LIBAVUTIL_VERSION_INT,
3663 };
3664
3665 const FFCodec ff_mpeg4_decoder = {
3666 .p.name = "mpeg4",
3667 .p.long_name = NULL_IF_CONFIG_SMALL("MPEG-4 part 2"),
3668 .p.type = AVMEDIA_TYPE_VIDEO,
3669 .p.id = AV_CODEC_ID_MPEG4,
3670 .priv_data_size = sizeof(Mpeg4DecContext),
3671 .init = decode_init,
3672 .close = ff_h263_decode_end,
3673 FF_CODEC_DECODE_CB(ff_h263_decode_frame),
3674 .p.capabilities = AV_CODEC_CAP_DRAW_HORIZ_BAND | AV_CODEC_CAP_DR1 |
3675 #if FF_API_FLAG_TRUNCATED
3676 AV_CODEC_CAP_TRUNCATED |
3677 #endif
3678 AV_CODEC_CAP_DELAY | AV_CODEC_CAP_FRAME_THREADS,
3679 .caps_internal = FF_CODEC_CAP_INIT_THREADSAFE |
3680 FF_CODEC_CAP_SKIP_FRAME_FILL_PARAM |
3681 FF_CODEC_CAP_ALLOCATE_PROGRESS,
3682 .flush = ff_mpeg_flush,
3683 .p.max_lowres = 3,
3684 .p.pix_fmts = ff_h263_hwaccel_pixfmt_list_420,
3685 .p.profiles = NULL_IF_CONFIG_SMALL(ff_mpeg4_video_profiles),
3686 .update_thread_context = ONLY_IF_THREADS_ENABLED(mpeg4_update_thread_context),
3687 .update_thread_context_for_user = ONLY_IF_THREADS_ENABLED(mpeg4_update_thread_context_for_user),
3688 .p.priv_class = &mpeg4_class,
3689 .hw_configs = (const AVCodecHWConfigInternal *const []) {
3690 #if CONFIG_MPEG4_NVDEC_HWACCEL
3691 HWACCEL_NVDEC(mpeg4),
3692 #endif
3693 #if CONFIG_MPEG4_VAAPI_HWACCEL
3694 HWACCEL_VAAPI(mpeg4),
3695 #endif
3696 #if CONFIG_MPEG4_VDPAU_HWACCEL
3697 HWACCEL_VDPAU(mpeg4),
3698 #endif
3699 #if CONFIG_MPEG4_VIDEOTOOLBOX_HWACCEL
3700 HWACCEL_VIDEOTOOLBOX(mpeg4),
3701 #endif
3702 NULL
3703 },
3704 };
3705