1 /*
2 * Motion Pixels Video Decoder
3 * Copyright (c) 2008 Gregory Montoir (cyx@users.sourceforge.net)
4 *
5 * This file is part of FFmpeg.
6 *
7 * FFmpeg is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2.1 of the License, or (at your option) any later version.
11 *
12 * FFmpeg is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
16 *
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with FFmpeg; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20 */
21
22 #include "libavutil/thread.h"
23
24 #include "config.h"
25
26 #include "avcodec.h"
27 #include "get_bits.h"
28 #include "bswapdsp.h"
29 #include "codec_internal.h"
30 #include "internal.h"
31
32 #define MAX_HUFF_CODES 16
33
34 #include "motionpixels_tablegen.h"
35
36 typedef struct HuffCode {
37 uint8_t size;
38 uint8_t delta;
39 } HuffCode;
40
41 typedef struct MotionPixelsContext {
42 AVCodecContext *avctx;
43 AVFrame *frame;
44 BswapDSPContext bdsp;
45 uint8_t *changes_map;
46 int offset_bits_len;
47 int codes_count, current_codes_count;
48 int max_codes_bits;
49 HuffCode codes[MAX_HUFF_CODES];
50 VLC vlc;
51 YuvPixel *vpt, *hpt;
52 uint8_t gradient_scale[3];
53 uint8_t *bswapbuf;
54 int bswapbuf_size;
55 } MotionPixelsContext;
56
mp_decode_end(AVCodecContext * avctx)57 static av_cold int mp_decode_end(AVCodecContext *avctx)
58 {
59 MotionPixelsContext *mp = avctx->priv_data;
60
61 av_freep(&mp->changes_map);
62 av_freep(&mp->vpt);
63 av_freep(&mp->hpt);
64 av_freep(&mp->bswapbuf);
65 av_frame_free(&mp->frame);
66
67 return 0;
68 }
69
mp_decode_init(AVCodecContext * avctx)70 static av_cold int mp_decode_init(AVCodecContext *avctx)
71 {
72 av_unused static AVOnce init_static_once = AV_ONCE_INIT;
73 MotionPixelsContext *mp = avctx->priv_data;
74 int w4 = (avctx->width + 3) & ~3;
75 int h4 = (avctx->height + 3) & ~3;
76
77 if(avctx->extradata_size < 2){
78 av_log(avctx, AV_LOG_ERROR, "extradata too small\n");
79 return AVERROR_INVALIDDATA;
80 }
81
82 mp->avctx = avctx;
83 ff_bswapdsp_init(&mp->bdsp);
84 mp->changes_map = av_calloc(avctx->width, h4);
85 mp->offset_bits_len = av_log2(avctx->width * avctx->height) + 1;
86 mp->vpt = av_calloc(avctx->height, sizeof(*mp->vpt));
87 mp->hpt = av_calloc(h4 / 4, w4 / 4 * sizeof(*mp->hpt));
88 if (!mp->changes_map || !mp->vpt || !mp->hpt)
89 return AVERROR(ENOMEM);
90 avctx->pix_fmt = AV_PIX_FMT_RGB555;
91
92 mp->frame = av_frame_alloc();
93 if (!mp->frame)
94 return AVERROR(ENOMEM);
95
96 #if !CONFIG_HARDCODED_TABLES
97 ff_thread_once(&init_static_once, motionpixels_tableinit);
98 #endif
99
100 return 0;
101 }
102
mp_read_changes_map(MotionPixelsContext * mp,GetBitContext * gb,int count,int bits_len,int read_color)103 static void mp_read_changes_map(MotionPixelsContext *mp, GetBitContext *gb, int count, int bits_len, int read_color)
104 {
105 uint16_t *pixels;
106 int offset, w, h, color = 0, x, y, i;
107
108 while (count--) {
109 offset = get_bits_long(gb, mp->offset_bits_len);
110 w = get_bits(gb, bits_len) + 1;
111 h = get_bits(gb, bits_len) + 1;
112 if (read_color)
113 color = get_bits(gb, 15);
114 x = offset % mp->avctx->width;
115 y = offset / mp->avctx->width;
116 if (y >= mp->avctx->height)
117 continue;
118 w = FFMIN(w, mp->avctx->width - x);
119 h = FFMIN(h, mp->avctx->height - y);
120 pixels = (uint16_t *)&mp->frame->data[0][y * mp->frame->linesize[0] + x * 2];
121 while (h--) {
122 mp->changes_map[offset] = w;
123 if (read_color)
124 for (i = 0; i < w; ++i)
125 pixels[i] = color;
126 offset += mp->avctx->width;
127 pixels += mp->frame->linesize[0] / 2;
128 }
129 }
130 }
131
mp_get_code(MotionPixelsContext * mp,GetBitContext * gb,int size)132 static int mp_get_code(MotionPixelsContext *mp, GetBitContext *gb, int size)
133 {
134 while (get_bits1(gb)) {
135 ++size;
136 if (size > mp->max_codes_bits) {
137 av_log(mp->avctx, AV_LOG_ERROR, "invalid code size %d/%d\n", size, mp->max_codes_bits);
138 return AVERROR_INVALIDDATA;
139 }
140 if (mp_get_code(mp, gb, size) < 0)
141 return AVERROR_INVALIDDATA;
142 }
143 if (mp->current_codes_count >= mp->codes_count) {
144 av_log(mp->avctx, AV_LOG_ERROR, "too many codes\n");
145 return AVERROR_INVALIDDATA;
146 }
147
148 mp->codes[mp->current_codes_count++].size = size;
149 return 0;
150 }
151
mp_read_codes_table(MotionPixelsContext * mp,GetBitContext * gb)152 static int mp_read_codes_table(MotionPixelsContext *mp, GetBitContext *gb)
153 {
154 if (mp->codes_count == 1) {
155 mp->codes[0].delta = get_bits(gb, 4);
156 } else {
157 int i;
158 int ret;
159
160 mp->max_codes_bits = get_bits(gb, 4);
161 for (i = 0; i < mp->codes_count; ++i)
162 mp->codes[i].delta = get_bits(gb, 4);
163 mp->current_codes_count = 0;
164 if ((ret = mp_get_code(mp, gb, 0)) < 0)
165 return ret;
166 if (mp->current_codes_count < mp->codes_count) {
167 av_log(mp->avctx, AV_LOG_ERROR, "too few codes\n");
168 return AVERROR_INVALIDDATA;
169 }
170 }
171 return 0;
172 }
173
mp_gradient(MotionPixelsContext * mp,int component,int v)174 static av_always_inline int mp_gradient(MotionPixelsContext *mp, int component, int v)
175 {
176 int delta;
177
178 delta = (v - 7) * mp->gradient_scale[component];
179 mp->gradient_scale[component] = (v == 0 || v == 14) ? 2 : 1;
180 return delta;
181 }
182
mp_get_yuv_from_rgb(MotionPixelsContext * mp,int x,int y)183 static YuvPixel mp_get_yuv_from_rgb(MotionPixelsContext *mp, int x, int y)
184 {
185 int color;
186
187 color = *(uint16_t *)&mp->frame->data[0][y * mp->frame->linesize[0] + x * 2];
188 return mp_rgb_yuv_table[color & 0x7FFF];
189 }
190
mp_set_rgb_from_yuv(MotionPixelsContext * mp,int x,int y,const YuvPixel * p)191 static void mp_set_rgb_from_yuv(MotionPixelsContext *mp, int x, int y, const YuvPixel *p)
192 {
193 int color;
194
195 color = mp_yuv_to_rgb(p->y, p->v, p->u, 1);
196 *(uint16_t *)&mp->frame->data[0][y * mp->frame->linesize[0] + x * 2] = color;
197 }
198
mp_get_vlc(MotionPixelsContext * mp,GetBitContext * gb)199 static av_always_inline int mp_get_vlc(MotionPixelsContext *mp, GetBitContext *gb)
200 {
201 return mp->vlc.table ? get_vlc2(gb, mp->vlc.table, mp->max_codes_bits, 1)
202 : mp->codes[0].delta;
203 }
204
mp_decode_line(MotionPixelsContext * mp,GetBitContext * gb,int y)205 static void mp_decode_line(MotionPixelsContext *mp, GetBitContext *gb, int y)
206 {
207 YuvPixel p;
208 const int y0 = y * mp->avctx->width;
209 int w, i, x = 0;
210
211 p = mp->vpt[y];
212 if (mp->changes_map[y0 + x] == 0) {
213 memset(mp->gradient_scale, 1, sizeof(mp->gradient_scale));
214 ++x;
215 }
216 while (x < mp->avctx->width) {
217 w = mp->changes_map[y0 + x];
218 if (w != 0) {
219 if ((y & 3) == 0) {
220 if (mp->changes_map[y0 + x + mp->avctx->width] < w ||
221 mp->changes_map[y0 + x + mp->avctx->width * 2] < w ||
222 mp->changes_map[y0 + x + mp->avctx->width * 3] < w) {
223 for (i = (x + 3) & ~3; i < x + w; i += 4) {
224 mp->hpt[((y / 4) * mp->avctx->width + i) / 4] = mp_get_yuv_from_rgb(mp, i, y);
225 }
226 }
227 }
228 x += w;
229 memset(mp->gradient_scale, 1, sizeof(mp->gradient_scale));
230 p = mp_get_yuv_from_rgb(mp, x - 1, y);
231 } else {
232 p.y += mp_gradient(mp, 0, mp_get_vlc(mp, gb));
233 p.y = av_clip_uintp2(p.y, 5);
234 if ((x & 3) == 0) {
235 if ((y & 3) == 0) {
236 p.v += mp_gradient(mp, 1, mp_get_vlc(mp, gb));
237 p.v = av_clip_intp2(p.v, 5);
238 p.u += mp_gradient(mp, 2, mp_get_vlc(mp, gb));
239 p.u = av_clip_intp2(p.u, 5);
240 mp->hpt[((y / 4) * mp->avctx->width + x) / 4] = p;
241 } else {
242 p.v = mp->hpt[((y / 4) * mp->avctx->width + x) / 4].v;
243 p.u = mp->hpt[((y / 4) * mp->avctx->width + x) / 4].u;
244 }
245 }
246 mp_set_rgb_from_yuv(mp, x, y, &p);
247 ++x;
248 }
249 }
250 }
251
mp_decode_frame_helper(MotionPixelsContext * mp,GetBitContext * gb)252 static void mp_decode_frame_helper(MotionPixelsContext *mp, GetBitContext *gb)
253 {
254 YuvPixel p;
255 int y, y0;
256
257 av_assert1(mp->changes_map[0]);
258
259 for (y = 0; y < mp->avctx->height; ++y) {
260 if (mp->changes_map[y * mp->avctx->width] != 0) {
261 memset(mp->gradient_scale, 1, sizeof(mp->gradient_scale));
262 p = mp_get_yuv_from_rgb(mp, 0, y);
263 } else {
264 p.y += mp_gradient(mp, 0, mp_get_vlc(mp, gb));
265 p.y = av_clip_uintp2(p.y, 5);
266 if ((y & 3) == 0) {
267 p.v += mp_gradient(mp, 1, mp_get_vlc(mp, gb));
268 p.v = av_clip_intp2(p.v, 5);
269 p.u += mp_gradient(mp, 2, mp_get_vlc(mp, gb));
270 p.u = av_clip_intp2(p.u, 5);
271 }
272 mp->vpt[y] = p;
273 mp_set_rgb_from_yuv(mp, 0, y, &p);
274 }
275 }
276 for (y0 = 0; y0 < 2; ++y0)
277 for (y = y0; y < mp->avctx->height; y += 2)
278 mp_decode_line(mp, gb, y);
279 }
280
mp_decode_frame(AVCodecContext * avctx,AVFrame * rframe,int * got_frame,AVPacket * avpkt)281 static int mp_decode_frame(AVCodecContext *avctx, AVFrame *rframe,
282 int *got_frame, AVPacket *avpkt)
283 {
284 const uint8_t *buf = avpkt->data;
285 int buf_size = avpkt->size;
286 MotionPixelsContext *mp = avctx->priv_data;
287 GetBitContext gb;
288 int i, count1, count2, sz, ret;
289
290 if ((ret = ff_reget_buffer(avctx, mp->frame, 0)) < 0)
291 return ret;
292
293 /* le32 bitstream msb first */
294 av_fast_padded_malloc(&mp->bswapbuf, &mp->bswapbuf_size, buf_size);
295 if (!mp->bswapbuf)
296 return AVERROR(ENOMEM);
297 mp->bdsp.bswap_buf((uint32_t *) mp->bswapbuf, (const uint32_t *) buf,
298 buf_size / 4);
299 if (buf_size & 3)
300 memcpy(mp->bswapbuf + (buf_size & ~3), buf + (buf_size & ~3), buf_size & 3);
301 init_get_bits(&gb, mp->bswapbuf, buf_size * 8);
302
303 memset(mp->changes_map, 0, avctx->width * avctx->height);
304 for (i = !(avctx->extradata[1] & 2); i < 2; ++i) {
305 count1 = get_bits(&gb, 12);
306 count2 = get_bits(&gb, 12);
307 mp_read_changes_map(mp, &gb, count1, 8, i);
308 mp_read_changes_map(mp, &gb, count2, 4, i);
309 }
310
311 mp->codes_count = get_bits(&gb, 4);
312 if (mp->codes_count == 0)
313 goto end;
314
315 if (mp->changes_map[0] == 0) {
316 *(uint16_t *)mp->frame->data[0] = get_bits(&gb, 15);
317 mp->changes_map[0] = 1;
318 }
319 if (mp_read_codes_table(mp, &gb) < 0)
320 goto end;
321
322 sz = get_bits(&gb, 18);
323 if (avctx->extradata[0] != 5)
324 sz += get_bits(&gb, 18);
325 if (sz == 0)
326 goto end;
327
328 if (mp->codes_count > 1) {
329 /* The entries of the mp->codes array are sorted from right to left
330 * in the Huffman tree, hence -(int)sizeof(HuffCode). */
331 ret = ff_init_vlc_from_lengths(&mp->vlc, mp->max_codes_bits, mp->codes_count,
332 &mp->codes[mp->codes_count - 1].size, -(int)sizeof(HuffCode),
333 &mp->codes[mp->codes_count - 1].delta, -(int)sizeof(HuffCode), 1,
334 0, 0, avctx);
335 if (ret < 0)
336 goto end;
337 }
338 mp_decode_frame_helper(mp, &gb);
339 ff_free_vlc(&mp->vlc);
340
341 end:
342 if ((ret = av_frame_ref(rframe, mp->frame)) < 0)
343 return ret;
344 *got_frame = 1;
345 return buf_size;
346 }
347
348 const FFCodec ff_motionpixels_decoder = {
349 .p.name = "motionpixels",
350 .p.long_name = NULL_IF_CONFIG_SMALL("Motion Pixels video"),
351 .p.type = AVMEDIA_TYPE_VIDEO,
352 .p.id = AV_CODEC_ID_MOTIONPIXELS,
353 .priv_data_size = sizeof(MotionPixelsContext),
354 .init = mp_decode_init,
355 .close = mp_decode_end,
356 FF_CODEC_DECODE_CB(mp_decode_frame),
357 .p.capabilities = AV_CODEC_CAP_DR1,
358 .caps_internal = FF_CODEC_CAP_INIT_CLEANUP | FF_CODEC_CAP_INIT_THREADSAFE,
359 };
360