1 /*
2 * Microsoft Screen 2 (aka Windows Media Video V9 Screen) decoder
3 *
4 * This file is part of FFmpeg.
5 *
6 * FFmpeg is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Lesser General Public
8 * License as published by the Free Software Foundation; either
9 * version 2.1 of the License, or (at your option) any later version.
10 *
11 * FFmpeg is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * Lesser General Public License for more details.
15 *
16 * You should have received a copy of the GNU Lesser General Public
17 * License along with FFmpeg; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19 */
20
21 /**
22 * @file
23 * Microsoft Screen 2 (aka Windows Media Video V9 Screen) decoder
24 */
25
26 #include "libavutil/avassert.h"
27 #include "error_resilience.h"
28 #include "internal.h"
29 #include "mpeg_er.h"
30 #include "msmpeg4.h"
31 #include "qpeldsp.h"
32 #include "vc1.h"
33 #include "wmv2data.h"
34 #include "mss12.h"
35 #include "mss2dsp.h"
36
37 typedef struct MSS2Context {
38 VC1Context v;
39 int split_position;
40 AVFrame *last_pic;
41 MSS12Context c;
42 MSS2DSPContext dsp;
43 QpelDSPContext qdsp;
44 SliceContext sc[2];
45 } MSS2Context;
46
arith2_normalise(ArithCoder * c)47 static void arith2_normalise(ArithCoder *c)
48 {
49 while ((c->high >> 15) - (c->low >> 15) < 2) {
50 if ((c->low ^ c->high) & 0x10000) {
51 c->high ^= 0x8000;
52 c->value ^= 0x8000;
53 c->low ^= 0x8000;
54 }
55 c->high = (uint16_t)c->high << 8 | 0xFF;
56 c->value = (uint16_t)c->value << 8 | bytestream2_get_byte(c->gbc.gB);
57 c->low = (uint16_t)c->low << 8;
58 }
59 }
60
ARITH_GET_BIT(arith2)61 ARITH_GET_BIT(arith2)
62
63 /* L. Stuiver and A. Moffat: "Piecewise Integer Mapping for Arithmetic Coding."
64 * In Proc. 8th Data Compression Conference (DCC '98), pp. 3-12, Mar. 1998 */
65
66 static int arith2_get_scaled_value(int value, int n, int range)
67 {
68 int split = (n << 1) - range;
69
70 if (value > split)
71 return split + (value - split >> 1);
72 else
73 return value;
74 }
75
arith2_rescale_interval(ArithCoder * c,int range,int low,int high,int n)76 static void arith2_rescale_interval(ArithCoder *c, int range,
77 int low, int high, int n)
78 {
79 int split = (n << 1) - range;
80
81 if (high > split)
82 c->high = split + (high - split << 1);
83 else
84 c->high = high;
85
86 c->high += c->low - 1;
87
88 if (low > split)
89 c->low += split + (low - split << 1);
90 else
91 c->low += low;
92 }
93
arith2_get_number(ArithCoder * c,int n)94 static int arith2_get_number(ArithCoder *c, int n)
95 {
96 int range = c->high - c->low + 1;
97 int scale = av_log2(range) - av_log2(n);
98 int val;
99
100 if (n << scale > range)
101 scale--;
102
103 n <<= scale;
104
105 val = arith2_get_scaled_value(c->value - c->low, n, range) >> scale;
106
107 arith2_rescale_interval(c, range, val << scale, (val + 1) << scale, n);
108
109 arith2_normalise(c);
110
111 return val;
112 }
113
arith2_get_prob(ArithCoder * c,int16_t * probs)114 static int arith2_get_prob(ArithCoder *c, int16_t *probs)
115 {
116 int range = c->high - c->low + 1, n = *probs;
117 int scale = av_log2(range) - av_log2(n);
118 int i = 0, val;
119
120 if (n << scale > range)
121 scale--;
122
123 n <<= scale;
124
125 val = arith2_get_scaled_value(c->value - c->low, n, range) >> scale;
126 while (probs[++i] > val) ;
127
128 arith2_rescale_interval(c, range,
129 probs[i] << scale, probs[i - 1] << scale, n);
130
131 return i;
132 }
133
ARITH_GET_MODEL_SYM(arith2)134 ARITH_GET_MODEL_SYM(arith2)
135
136 static int arith2_get_consumed_bytes(ArithCoder *c)
137 {
138 int diff = (c->high >> 16) - (c->low >> 16);
139 int bp = bytestream2_tell(c->gbc.gB) - 3 << 3;
140 int bits = 1;
141
142 while (!(diff & 0x80)) {
143 bits++;
144 diff <<= 1;
145 }
146
147 return (bits + bp + 7 >> 3) + ((c->low >> 16) + 1 == c->high >> 16);
148 }
149
arith2_init(ArithCoder * c,GetByteContext * gB)150 static void arith2_init(ArithCoder *c, GetByteContext *gB)
151 {
152 c->low = 0;
153 c->high = 0xFFFFFF;
154 c->value = bytestream2_get_be24(gB);
155 c->overread = 0;
156 c->gbc.gB = gB;
157 c->get_model_sym = arith2_get_model_sym;
158 c->get_number = arith2_get_number;
159 }
160
decode_pal_v2(MSS12Context * ctx,const uint8_t * buf,int buf_size)161 static int decode_pal_v2(MSS12Context *ctx, const uint8_t *buf, int buf_size)
162 {
163 int i, ncol;
164 uint32_t *pal = ctx->pal + 256 - ctx->free_colours;
165
166 if (!ctx->free_colours)
167 return 0;
168
169 ncol = *buf++;
170 if (ncol > ctx->free_colours || buf_size < 2 + ncol * 3)
171 return AVERROR_INVALIDDATA;
172 for (i = 0; i < ncol; i++)
173 *pal++ = AV_RB24(buf + 3 * i);
174
175 return 1 + ncol * 3;
176 }
177
decode_555(AVCodecContext * avctx,GetByteContext * gB,uint16_t * dst,ptrdiff_t stride,int keyframe,int w,int h)178 static int decode_555(AVCodecContext *avctx, GetByteContext *gB, uint16_t *dst, ptrdiff_t stride,
179 int keyframe, int w, int h)
180 {
181 int last_symbol = 0, repeat = 0, prev_avail = 0;
182
183 if (!keyframe) {
184 int x, y, endx, endy, t;
185
186 #define READ_PAIR(a, b) \
187 a = bytestream2_get_byte(gB) << 4; \
188 t = bytestream2_get_byte(gB); \
189 a |= t >> 4; \
190 b = (t & 0xF) << 8; \
191 b |= bytestream2_get_byte(gB); \
192
193 READ_PAIR(x, endx)
194 READ_PAIR(y, endy)
195
196 if (endx >= w || endy >= h || x > endx || y > endy)
197 return AVERROR_INVALIDDATA;
198 dst += x + stride * y;
199 w = endx - x + 1;
200 h = endy - y + 1;
201 if (y)
202 prev_avail = 1;
203 }
204
205 do {
206 uint16_t *p = dst;
207 do {
208 if (repeat-- < 1) {
209 int b = bytestream2_get_byte(gB);
210 if (b < 128)
211 last_symbol = b << 8 | bytestream2_get_byte(gB);
212 else if (b > 129) {
213 repeat = 0;
214 while (b-- > 130) {
215 if (repeat >= (INT_MAX >> 8) - 1) {
216 av_log(avctx, AV_LOG_ERROR, "repeat overflow\n");
217 return AVERROR_INVALIDDATA;
218 }
219 repeat = (repeat << 8) + bytestream2_get_byte(gB) + 1;
220 }
221 if (last_symbol == -2) {
222 int skip = FFMIN((unsigned)repeat, dst + w - p);
223 repeat -= skip;
224 p += skip;
225 }
226 } else
227 last_symbol = 127 - b;
228 }
229 if (last_symbol >= 0)
230 *p = last_symbol;
231 else if (last_symbol == -1 && prev_avail)
232 *p = *(p - stride);
233 } while (++p < dst + w);
234 dst += stride;
235 prev_avail = 1;
236 } while (--h);
237
238 return 0;
239 }
240
decode_rle(GetBitContext * gb,uint8_t * pal_dst,ptrdiff_t pal_stride,uint8_t * rgb_dst,ptrdiff_t rgb_stride,uint32_t * pal,int keyframe,int kf_slipt,int slice,int w,int h)241 static int decode_rle(GetBitContext *gb, uint8_t *pal_dst, ptrdiff_t pal_stride,
242 uint8_t *rgb_dst, ptrdiff_t rgb_stride, uint32_t *pal,
243 int keyframe, int kf_slipt, int slice, int w, int h)
244 {
245 uint8_t bits[270] = { 0 };
246 uint32_t codes[270];
247 VLC vlc;
248
249 int current_length = 0, read_codes = 0, next_code = 0, current_codes = 0;
250 int remaining_codes, surplus_codes, i;
251
252 const int alphabet_size = 270 - keyframe;
253
254 int last_symbol = 0, repeat = 0, prev_avail = 0;
255
256 if (!keyframe) {
257 int x, y, clipw, cliph;
258
259 x = get_bits(gb, 12);
260 y = get_bits(gb, 12);
261 clipw = get_bits(gb, 12) + 1;
262 cliph = get_bits(gb, 12) + 1;
263
264 if (x + clipw > w || y + cliph > h)
265 return AVERROR_INVALIDDATA;
266 pal_dst += pal_stride * y + x;
267 rgb_dst += rgb_stride * y + x * 3;
268 w = clipw;
269 h = cliph;
270 if (y)
271 prev_avail = 1;
272 } else {
273 if (slice > 0) {
274 pal_dst += pal_stride * kf_slipt;
275 rgb_dst += rgb_stride * kf_slipt;
276 prev_avail = 1;
277 h -= kf_slipt;
278 } else
279 h = kf_slipt;
280 }
281
282 /* read explicit codes */
283 do {
284 while (current_codes--) {
285 int symbol = get_bits(gb, 8);
286 if (symbol >= 204 - keyframe)
287 symbol += 14 - keyframe;
288 else if (symbol > 189)
289 symbol = get_bits1(gb) + (symbol << 1) - 190;
290 if (bits[symbol])
291 return AVERROR_INVALIDDATA;
292 bits[symbol] = current_length;
293 codes[symbol] = next_code++;
294 read_codes++;
295 }
296 current_length++;
297 next_code <<= 1;
298 remaining_codes = (1 << current_length) - next_code;
299 current_codes = get_bits(gb, av_ceil_log2(remaining_codes + 1));
300 if (current_length > 22 || current_codes > remaining_codes)
301 return AVERROR_INVALIDDATA;
302 } while (current_codes != remaining_codes);
303
304 remaining_codes = alphabet_size - read_codes;
305
306 /* determine the minimum length to fit the rest of the alphabet */
307 while ((surplus_codes = (2 << current_length) -
308 (next_code << 1) - remaining_codes) < 0) {
309 current_length++;
310 next_code <<= 1;
311 }
312
313 /* add the rest of the symbols lexicographically */
314 for (i = 0; i < alphabet_size; i++)
315 if (!bits[i]) {
316 if (surplus_codes-- == 0) {
317 current_length++;
318 next_code <<= 1;
319 }
320 bits[i] = current_length;
321 codes[i] = next_code++;
322 }
323
324 if (next_code != 1 << current_length)
325 return AVERROR_INVALIDDATA;
326
327 if ((i = init_vlc(&vlc, 9, alphabet_size, bits, 1, 1, codes, 4, 4, 0)) < 0)
328 return i;
329
330 /* frame decode */
331 do {
332 uint8_t *pp = pal_dst;
333 uint8_t *rp = rgb_dst;
334 do {
335 if (repeat-- < 1) {
336 int b = get_vlc2(gb, vlc.table, 9, 3);
337 if (b < 256)
338 last_symbol = b;
339 else if (b < 268) {
340 b -= 256;
341 if (b == 11)
342 b = get_bits(gb, 4) + 10;
343
344 if (!b)
345 repeat = 0;
346 else
347 repeat = get_bits(gb, b);
348
349 repeat += (1 << b) - 1;
350
351 if (last_symbol == -2) {
352 int skip = FFMIN(repeat, pal_dst + w - pp);
353 repeat -= skip;
354 pp += skip;
355 rp += skip * 3;
356 }
357 } else
358 last_symbol = 267 - b;
359 }
360 if (last_symbol >= 0) {
361 *pp = last_symbol;
362 AV_WB24(rp, pal[last_symbol]);
363 } else if (last_symbol == -1 && prev_avail) {
364 *pp = *(pp - pal_stride);
365 memcpy(rp, rp - rgb_stride, 3);
366 }
367 rp += 3;
368 } while (++pp < pal_dst + w);
369 pal_dst += pal_stride;
370 rgb_dst += rgb_stride;
371 prev_avail = 1;
372 } while (--h);
373
374 ff_free_vlc(&vlc);
375 return 0;
376 }
377
decode_wmv9(AVCodecContext * avctx,const uint8_t * buf,int buf_size,int x,int y,int w,int h,int wmv9_mask)378 static int decode_wmv9(AVCodecContext *avctx, const uint8_t *buf, int buf_size,
379 int x, int y, int w, int h, int wmv9_mask)
380 {
381 MSS2Context *ctx = avctx->priv_data;
382 MSS12Context *c = &ctx->c;
383 VC1Context *v = avctx->priv_data;
384 MpegEncContext *s = &v->s;
385 AVFrame *f;
386 int ret;
387
388 ff_mpeg_flush(avctx);
389
390 if ((ret = init_get_bits8(&s->gb, buf, buf_size)) < 0)
391 return ret;
392
393 s->loop_filter = avctx->skip_loop_filter < AVDISCARD_ALL;
394
395 if (ff_vc1_parse_frame_header(v, &s->gb) < 0) {
396 av_log(v->s.avctx, AV_LOG_ERROR, "header error\n");
397 return AVERROR_INVALIDDATA;
398 }
399
400 if (s->pict_type != AV_PICTURE_TYPE_I) {
401 av_log(v->s.avctx, AV_LOG_ERROR, "expected I-frame\n");
402 return AVERROR_INVALIDDATA;
403 }
404
405 avctx->pix_fmt = AV_PIX_FMT_YUV420P;
406
407 if ((ret = ff_mpv_frame_start(s, avctx)) < 0) {
408 av_log(v->s.avctx, AV_LOG_ERROR, "ff_mpv_frame_start error\n");
409 avctx->pix_fmt = AV_PIX_FMT_RGB24;
410 return ret;
411 }
412
413 ff_mpeg_er_frame_start(s);
414
415 v->end_mb_x = (w + 15) >> 4;
416 s->end_mb_y = (h + 15) >> 4;
417 if (v->respic & 1)
418 v->end_mb_x = v->end_mb_x + 1 >> 1;
419 if (v->respic & 2)
420 s->end_mb_y = s->end_mb_y + 1 >> 1;
421
422 ff_vc1_decode_blocks(v);
423
424 if (v->end_mb_x == s->mb_width && s->end_mb_y == s->mb_height) {
425 ff_er_frame_end(&s->er);
426 } else {
427 av_log(v->s.avctx, AV_LOG_WARNING,
428 "disabling error correction due to block count mismatch %dx%d != %dx%d\n",
429 v->end_mb_x, s->end_mb_y, s->mb_width, s->mb_height);
430 }
431
432 ff_mpv_frame_end(s);
433
434 f = s->current_picture.f;
435
436 if (v->respic == 3) {
437 ctx->dsp.upsample_plane(f->data[0], f->linesize[0], w, h);
438 ctx->dsp.upsample_plane(f->data[1], f->linesize[1], w+1 >> 1, h+1 >> 1);
439 ctx->dsp.upsample_plane(f->data[2], f->linesize[2], w+1 >> 1, h+1 >> 1);
440 } else if (v->respic)
441 avpriv_request_sample(v->s.avctx,
442 "Asymmetric WMV9 rectangle subsampling");
443
444 av_assert0(f->linesize[1] == f->linesize[2]);
445
446 if (wmv9_mask != -1)
447 ctx->dsp.mss2_blit_wmv9_masked(c->rgb_pic + y * c->rgb_stride + x * 3,
448 c->rgb_stride, wmv9_mask,
449 c->pal_pic + y * c->pal_stride + x,
450 c->pal_stride,
451 f->data[0], f->linesize[0],
452 f->data[1], f->data[2], f->linesize[1],
453 w, h);
454 else
455 ctx->dsp.mss2_blit_wmv9(c->rgb_pic + y * c->rgb_stride + x * 3,
456 c->rgb_stride,
457 f->data[0], f->linesize[0],
458 f->data[1], f->data[2], f->linesize[1],
459 w, h);
460
461 avctx->pix_fmt = AV_PIX_FMT_RGB24;
462
463 return 0;
464 }
465
466 struct Rectangle {
467 int coded, x, y, w, h;
468 };
469
470 #define MAX_WMV9_RECTANGLES 20
471 #define ARITH2_PADDING 2
472
mss2_decode_frame(AVCodecContext * avctx,void * data,int * got_frame,AVPacket * avpkt)473 static int mss2_decode_frame(AVCodecContext *avctx, void *data, int *got_frame,
474 AVPacket *avpkt)
475 {
476 const uint8_t *buf = avpkt->data;
477 int buf_size = avpkt->size;
478 MSS2Context *ctx = avctx->priv_data;
479 MSS12Context *c = &ctx->c;
480 AVFrame *frame = data;
481 GetBitContext gb;
482 GetByteContext gB;
483 ArithCoder acoder;
484
485 int keyframe, has_wmv9, has_mv, is_rle, is_555, ret;
486
487 struct Rectangle wmv9rects[MAX_WMV9_RECTANGLES], *r;
488 int used_rects = 0, i, implicit_rect = 0, av_uninit(wmv9_mask);
489
490 if ((ret = init_get_bits8(&gb, buf, buf_size)) < 0)
491 return ret;
492
493 if (keyframe = get_bits1(&gb))
494 skip_bits(&gb, 7);
495 has_wmv9 = get_bits1(&gb);
496 has_mv = keyframe ? 0 : get_bits1(&gb);
497 is_rle = get_bits1(&gb);
498 is_555 = is_rle && get_bits1(&gb);
499 if (c->slice_split > 0)
500 ctx->split_position = c->slice_split;
501 else if (c->slice_split < 0) {
502 if (get_bits1(&gb)) {
503 if (get_bits1(&gb)) {
504 if (get_bits1(&gb))
505 ctx->split_position = get_bits(&gb, 16);
506 else
507 ctx->split_position = get_bits(&gb, 12);
508 } else
509 ctx->split_position = get_bits(&gb, 8) << 4;
510 } else {
511 if (keyframe)
512 ctx->split_position = avctx->height / 2;
513 }
514 } else
515 ctx->split_position = avctx->height;
516
517 if (c->slice_split && (ctx->split_position < 1 - is_555 ||
518 ctx->split_position > avctx->height - 1))
519 return AVERROR_INVALIDDATA;
520
521 align_get_bits(&gb);
522 buf += get_bits_count(&gb) >> 3;
523 buf_size -= get_bits_count(&gb) >> 3;
524
525 if (buf_size < 1)
526 return AVERROR_INVALIDDATA;
527
528 if (is_555 && (has_wmv9 || has_mv || c->slice_split && ctx->split_position))
529 return AVERROR_INVALIDDATA;
530
531 avctx->pix_fmt = is_555 ? AV_PIX_FMT_RGB555 : AV_PIX_FMT_RGB24;
532 if (ctx->last_pic->format != avctx->pix_fmt)
533 av_frame_unref(ctx->last_pic);
534
535 if (has_wmv9) {
536 bytestream2_init(&gB, buf, buf_size + ARITH2_PADDING);
537 arith2_init(&acoder, &gB);
538
539 implicit_rect = !arith2_get_bit(&acoder);
540
541 while (arith2_get_bit(&acoder)) {
542 if (used_rects == MAX_WMV9_RECTANGLES)
543 return AVERROR_INVALIDDATA;
544 r = &wmv9rects[used_rects];
545 if (!used_rects)
546 r->x = arith2_get_number(&acoder, avctx->width);
547 else
548 r->x = arith2_get_number(&acoder, avctx->width -
549 wmv9rects[used_rects - 1].x) +
550 wmv9rects[used_rects - 1].x;
551 r->y = arith2_get_number(&acoder, avctx->height);
552 r->w = arith2_get_number(&acoder, avctx->width - r->x) + 1;
553 r->h = arith2_get_number(&acoder, avctx->height - r->y) + 1;
554 used_rects++;
555 }
556
557 if (implicit_rect && used_rects) {
558 av_log(avctx, AV_LOG_ERROR, "implicit_rect && used_rects > 0\n");
559 return AVERROR_INVALIDDATA;
560 }
561
562 if (implicit_rect) {
563 wmv9rects[0].x = 0;
564 wmv9rects[0].y = 0;
565 wmv9rects[0].w = avctx->width;
566 wmv9rects[0].h = avctx->height;
567
568 used_rects = 1;
569 }
570 for (i = 0; i < used_rects; i++) {
571 if (!implicit_rect && arith2_get_bit(&acoder)) {
572 av_log(avctx, AV_LOG_ERROR, "Unexpected grandchildren\n");
573 return AVERROR_INVALIDDATA;
574 }
575 if (!i) {
576 wmv9_mask = arith2_get_bit(&acoder) - 1;
577 if (!wmv9_mask)
578 wmv9_mask = arith2_get_number(&acoder, 256);
579 }
580 wmv9rects[i].coded = arith2_get_number(&acoder, 2);
581 }
582
583 buf += arith2_get_consumed_bytes(&acoder);
584 buf_size -= arith2_get_consumed_bytes(&acoder);
585 if (buf_size < 1)
586 return AVERROR_INVALIDDATA;
587 }
588
589 c->mvX = c->mvY = 0;
590 if (keyframe && !is_555) {
591 if ((i = decode_pal_v2(c, buf, buf_size)) < 0)
592 return AVERROR_INVALIDDATA;
593 buf += i;
594 buf_size -= i;
595 } else if (has_mv) {
596 buf += 4;
597 buf_size -= 4;
598 if (buf_size < 1)
599 return AVERROR_INVALIDDATA;
600 c->mvX = AV_RB16(buf - 4) - avctx->width;
601 c->mvY = AV_RB16(buf - 2) - avctx->height;
602 }
603
604 if (c->mvX < 0 || c->mvY < 0) {
605 FFSWAP(uint8_t *, c->pal_pic, c->last_pal_pic);
606
607 if ((ret = ff_get_buffer(avctx, frame, AV_GET_BUFFER_FLAG_REF)) < 0)
608 return ret;
609
610 if (ctx->last_pic->data[0]) {
611 av_assert0(frame->linesize[0] == ctx->last_pic->linesize[0]);
612 c->last_rgb_pic = ctx->last_pic->data[0] +
613 ctx->last_pic->linesize[0] * (avctx->height - 1);
614 } else {
615 av_log(avctx, AV_LOG_ERROR, "Missing keyframe\n");
616 return AVERROR_INVALIDDATA;
617 }
618 } else {
619 if ((ret = ff_reget_buffer(avctx, ctx->last_pic, 0)) < 0)
620 return ret;
621 if ((ret = av_frame_ref(frame, ctx->last_pic)) < 0)
622 return ret;
623
624 c->last_rgb_pic = NULL;
625 }
626 c->rgb_pic = frame->data[0] +
627 frame->linesize[0] * (avctx->height - 1);
628 c->rgb_stride = -frame->linesize[0];
629
630 frame->key_frame = keyframe;
631 frame->pict_type = keyframe ? AV_PICTURE_TYPE_I : AV_PICTURE_TYPE_P;
632
633 if (is_555) {
634 bytestream2_init(&gB, buf, buf_size);
635
636 if (decode_555(avctx, &gB, (uint16_t *)c->rgb_pic, c->rgb_stride >> 1,
637 keyframe, avctx->width, avctx->height))
638 return AVERROR_INVALIDDATA;
639
640 buf_size -= bytestream2_tell(&gB);
641 } else {
642 if (keyframe) {
643 c->corrupted = 0;
644 ff_mss12_slicecontext_reset(&ctx->sc[0]);
645 if (c->slice_split)
646 ff_mss12_slicecontext_reset(&ctx->sc[1]);
647 }
648 if (is_rle) {
649 if ((ret = init_get_bits8(&gb, buf, buf_size)) < 0)
650 return ret;
651 if (ret = decode_rle(&gb, c->pal_pic, c->pal_stride,
652 c->rgb_pic, c->rgb_stride, c->pal, keyframe,
653 ctx->split_position, 0,
654 avctx->width, avctx->height))
655 return ret;
656 align_get_bits(&gb);
657
658 if (c->slice_split)
659 if (ret = decode_rle(&gb, c->pal_pic, c->pal_stride,
660 c->rgb_pic, c->rgb_stride, c->pal, keyframe,
661 ctx->split_position, 1,
662 avctx->width, avctx->height))
663 return ret;
664
665 align_get_bits(&gb);
666 buf += get_bits_count(&gb) >> 3;
667 buf_size -= get_bits_count(&gb) >> 3;
668 } else if (!implicit_rect || wmv9_mask != -1) {
669 if (c->corrupted)
670 return AVERROR_INVALIDDATA;
671 bytestream2_init(&gB, buf, buf_size + ARITH2_PADDING);
672 arith2_init(&acoder, &gB);
673 c->keyframe = keyframe;
674 if (c->corrupted = ff_mss12_decode_rect(&ctx->sc[0], &acoder, 0, 0,
675 avctx->width,
676 ctx->split_position))
677 return AVERROR_INVALIDDATA;
678
679 buf += arith2_get_consumed_bytes(&acoder);
680 buf_size -= arith2_get_consumed_bytes(&acoder);
681 if (c->slice_split) {
682 if (buf_size < 1)
683 return AVERROR_INVALIDDATA;
684 bytestream2_init(&gB, buf, buf_size + ARITH2_PADDING);
685 arith2_init(&acoder, &gB);
686 if (c->corrupted = ff_mss12_decode_rect(&ctx->sc[1], &acoder, 0,
687 ctx->split_position,
688 avctx->width,
689 avctx->height - ctx->split_position))
690 return AVERROR_INVALIDDATA;
691
692 buf += arith2_get_consumed_bytes(&acoder);
693 buf_size -= arith2_get_consumed_bytes(&acoder);
694 }
695 } else
696 memset(c->pal_pic, 0, c->pal_stride * avctx->height);
697 }
698
699 if (has_wmv9) {
700 for (i = 0; i < used_rects; i++) {
701 int x = wmv9rects[i].x;
702 int y = wmv9rects[i].y;
703 int w = wmv9rects[i].w;
704 int h = wmv9rects[i].h;
705 if (wmv9rects[i].coded) {
706 int WMV9codedFrameSize;
707 if (buf_size < 4 || !(WMV9codedFrameSize = AV_RL24(buf)))
708 return AVERROR_INVALIDDATA;
709 if (ret = decode_wmv9(avctx, buf + 3, buf_size - 3,
710 x, y, w, h, wmv9_mask))
711 return ret;
712 buf += WMV9codedFrameSize + 3;
713 buf_size -= WMV9codedFrameSize + 3;
714 } else {
715 uint8_t *dst = c->rgb_pic + y * c->rgb_stride + x * 3;
716 if (wmv9_mask != -1) {
717 ctx->dsp.mss2_gray_fill_masked(dst, c->rgb_stride,
718 wmv9_mask,
719 c->pal_pic + y * c->pal_stride + x,
720 c->pal_stride,
721 w, h);
722 } else {
723 do {
724 memset(dst, 0x80, w * 3);
725 dst += c->rgb_stride;
726 } while (--h);
727 }
728 }
729 }
730 }
731
732 if (buf_size)
733 av_log(avctx, AV_LOG_WARNING, "buffer not fully consumed\n");
734
735 if (c->mvX < 0 || c->mvY < 0) {
736 av_frame_unref(ctx->last_pic);
737 ret = av_frame_ref(ctx->last_pic, frame);
738 if (ret < 0)
739 return ret;
740 }
741
742 *got_frame = 1;
743
744 return avpkt->size;
745 }
746
wmv9_init(AVCodecContext * avctx)747 static av_cold int wmv9_init(AVCodecContext *avctx)
748 {
749 VC1Context *v = avctx->priv_data;
750 int ret;
751
752 v->s.avctx = avctx;
753
754 if ((ret = ff_vc1_init_common(v)) < 0)
755 return ret;
756 ff_vc1dsp_init(&v->vc1dsp);
757
758 v->profile = PROFILE_MAIN;
759
760 v->zz_8x4 = ff_wmv2_scantableA;
761 v->zz_4x8 = ff_wmv2_scantableB;
762 v->res_y411 = 0;
763 v->res_sprite = 0;
764
765 v->frmrtq_postproc = 7;
766 v->bitrtq_postproc = 31;
767
768 v->res_x8 = 0;
769 v->multires = 0;
770 v->res_fasttx = 1;
771
772 v->fastuvmc = 0;
773
774 v->extended_mv = 0;
775
776 v->dquant = 1;
777 v->vstransform = 1;
778
779 v->res_transtab = 0;
780
781 v->overlap = 0;
782
783 v->resync_marker = 0;
784 v->rangered = 0;
785
786 v->s.max_b_frames = avctx->max_b_frames = 0;
787 v->quantizer_mode = 0;
788
789 v->finterpflag = 0;
790
791 v->res_rtm_flag = 1;
792
793 ff_vc1_init_transposed_scantables(v);
794
795 if ((ret = ff_msmpeg4_decode_init(avctx)) < 0 ||
796 (ret = ff_vc1_decode_init_alloc_tables(v)) < 0)
797 return ret;
798
799 /* error concealment */
800 v->s.me.qpel_put = v->s.qdsp.put_qpel_pixels_tab;
801 v->s.me.qpel_avg = v->s.qdsp.avg_qpel_pixels_tab;
802
803 return 0;
804 }
805
mss2_decode_end(AVCodecContext * avctx)806 static av_cold int mss2_decode_end(AVCodecContext *avctx)
807 {
808 MSS2Context *const ctx = avctx->priv_data;
809
810 av_frame_free(&ctx->last_pic);
811
812 ff_mss12_decode_end(&ctx->c);
813 av_freep(&ctx->c.pal_pic);
814 av_freep(&ctx->c.last_pal_pic);
815 ff_vc1_decode_end(avctx);
816
817 return 0;
818 }
819
mss2_decode_init(AVCodecContext * avctx)820 static av_cold int mss2_decode_init(AVCodecContext *avctx)
821 {
822 MSS2Context * const ctx = avctx->priv_data;
823 MSS12Context *c = &ctx->c;
824 int ret;
825 c->avctx = avctx;
826 if (ret = ff_mss12_decode_init(c, 1, &ctx->sc[0], &ctx->sc[1]))
827 return ret;
828 ctx->last_pic = av_frame_alloc();
829 c->pal_stride = c->mask_stride;
830 c->pal_pic = av_mallocz(c->pal_stride * avctx->height);
831 c->last_pal_pic = av_mallocz(c->pal_stride * avctx->height);
832 if (!c->pal_pic || !c->last_pal_pic || !ctx->last_pic) {
833 mss2_decode_end(avctx);
834 return AVERROR(ENOMEM);
835 }
836 if (ret = wmv9_init(avctx)) {
837 mss2_decode_end(avctx);
838 return ret;
839 }
840 ff_mss2dsp_init(&ctx->dsp);
841 ff_qpeldsp_init(&ctx->qdsp);
842
843 avctx->pix_fmt = c->free_colours == 127 ? AV_PIX_FMT_RGB555
844 : AV_PIX_FMT_RGB24;
845
846
847 return 0;
848 }
849
850 AVCodec ff_mss2_decoder = {
851 .name = "mss2",
852 .long_name = NULL_IF_CONFIG_SMALL("MS Windows Media Video V9 Screen"),
853 .type = AVMEDIA_TYPE_VIDEO,
854 .id = AV_CODEC_ID_MSS2,
855 .priv_data_size = sizeof(MSS2Context),
856 .init = mss2_decode_init,
857 .close = mss2_decode_end,
858 .decode = mss2_decode_frame,
859 .capabilities = AV_CODEC_CAP_DR1,
860 };
861