FFmpeg coverage

Directory: ../../../ffmpeg/
File: src/libavcodec/cinepak.c
Date: 2026-01-23 19:11:46
Exec Total Coverage
Lines: 223 254 87.8%
Functions: 8 8 100.0%
Branches: 114 160 71.2%
Line Branch Exec Source
1 /*
2 * Cinepak Video Decoder
3 * Copyright (C) 2003 The FFmpeg project
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 /**
23 * @file
24 * Cinepak video decoder
25 * @author Ewald Snel <ewald@rambo.its.tudelft.nl>
26 *
27 * @see For more information on the Cinepak algorithm, visit:
28 * http://www.csse.monash.edu.au/~timf/
29 * @see For more information on the quirky data inside Sega FILM/CPK files, visit:
30 * http://wiki.multimedia.cx/index.php?title=Sega_FILM
31 *
32 * Cinepak colorspace support (c) 2013 Rl, Aetey Global Technologies AB
33 * @author Cinepak colorspace, Rl, Aetey Global Technologies AB
34 */
35
36 #include <stdio.h>
37 #include <string.h>
38
39 #include "libavutil/common.h"
40 #include "libavutil/intreadwrite.h"
41 #include "avcodec.h"
42 #include "codec_internal.h"
43 #include "decode.h"
44
45
46 typedef uint8_t cvid_codebook[12];
47
48 #define MAX_STRIPS 32
49
50 typedef struct cvid_strip {
51 uint16_t id;
52 uint16_t x1, y1;
53 uint16_t x2, y2;
54 cvid_codebook v4_codebook[256];
55 cvid_codebook v1_codebook[256];
56 } cvid_strip;
57
58 typedef struct CinepakContext {
59
60 AVCodecContext *avctx;
61 AVFrame *frame;
62
63 const unsigned char *data;
64 int size;
65
66 int width, height;
67
68 int palette_video;
69 cvid_strip strips[MAX_STRIPS];
70
71 int sega_film_skip_bytes;
72
73 uint32_t pal[256];
74 } CinepakContext;
75
76 2384 static void cinepak_decode_codebook (cvid_codebook *codebook,
77 int chunk_id, int size, const uint8_t *data)
78 {
79 2384 const uint8_t *eod = (data + size);
80 uint32_t flag, mask;
81 int i, n;
82 uint8_t *p;
83
84 /* check if this chunk contains 4- or 6-element vectors */
85
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 2384 n = (chunk_id & 0x04) ? 4 : 6;
86 2384 flag = 0;
87 2384 mask = 0;
88
89 2384 p = codebook[0];
90
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 456889 for (i=0; i < 256; i++) {
91
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 455222 if ((chunk_id & 0x01) && !(mask >>= 1)) {
92
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 9271 if ((data + 4) > eod)
93 127 break;
94
95 9144 flag = AV_RB32 (data);
96 9144 data += 4;
97 9144 mask = 0x80000000;
98 }
99
100
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 727419 if (!(chunk_id & 0x01) || (flag & mask)) {
101 int k, kk;
102
103
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 272914 if ((data + n) > eod)
104 590 break;
105
106
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 1361620 for (k = 0; k < 4; ++k) {
107 1089296 int r = *data++;
108
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 4357184 for (kk = 0; kk < 3; ++kk)
109 3267888 *p++ = r;
110 }
111
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 272324 if (n == 6) {
112 int r, g, b, u, v;
113 249669 u = *(int8_t *)data++;
114 249669 v = *(int8_t *)data++;
115 249669 p -= 12;
116
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 1248345 for(k=0; k<4; ++k) {
117 998676 r = *p++ + v*2;
118 998676 g = *p++ - (u/2) - v;
119 998676 b = *p + u*2;
120 998676 p -= 2;
121 998676 *p++ = av_clip_uint8(r);
122 998676 *p++ = av_clip_uint8(g);
123 998676 *p++ = av_clip_uint8(b);
124 }
125 }
126 } else {
127 182181 p += 12;
128 }
129 }
130 2384 }
131
132 1192 static int cinepak_decode_vectors (CinepakContext *s, cvid_strip *strip,
133 int chunk_id, int size, const uint8_t *data)
134 {
135 1192 const uint8_t *eod = (data + size);
136 uint32_t flag, mask;
137 uint8_t *cb0, *cb1, *cb2, *cb3;
138 int x, y;
139 char *ip0, *ip1, *ip2, *ip3;
140
141 1192 flag = 0;
142 1192 mask = 0;
143
144
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 22851 for (y=strip->y1; y < strip->y2; y+=4) {
145
146 /* take care of y dimension not being multiple of 4, such streams exist */
147 43324 ip0 = ip1 = ip2 = ip3 = s->frame->data[0] +
148
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 21662 (s->palette_video?strip->x1:strip->x1*3) + (y * s->frame->linesize[0]);
149
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 21662 if(s->avctx->height - y > 1) {
150 21662 ip1 = ip0 + s->frame->linesize[0];
151
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 21662 if(s->avctx->height - y > 2) {
152 21662 ip2 = ip1 + s->frame->linesize[0];
153
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 21662 if(s->avctx->height - y > 3) {
154 21354 ip3 = ip2 + s->frame->linesize[0];
155 }
156 }
157 }
158 /* to get the correct picture for not-multiple-of-4 cases let us fill each
159 * block from the bottom up, thus possibly overwriting the bottommost line
160 * more than once but ending with the correct data in place
161 * (instead of in-loop checking) */
162
163
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 1503579 for (x=strip->x1; x < strip->x2; x+=4) {
164
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 1481920 if ((chunk_id & 0x01) && !(mask >>= 1)) {
165
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 38088 if ((data + 4) > eod)
166 ✗ return AVERROR_INVALIDDATA;
167
168 38088 flag = AV_RB32 (data);
169 38088 data += 4;
170 38088 mask = 0x80000000;
171 }
172
173
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 1481920 if (!(chunk_id & 0x01) || (flag & mask)) {
174
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 1006965 if (!(chunk_id & 0x02) && !(mask >>= 1)) {
175
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 30275 if ((data + 4) > eod)
176 ✗ return AVERROR_INVALIDDATA;
177
178 30275 flag = AV_RB32 (data);
179 30275 data += 4;
180 30275 mask = 0x80000000;
181 }
182
183
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 1331594 if ((chunk_id & 0x02) || (~flag & mask)) {
184 uint8_t *p;
185
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 324629 if (data >= eod)
186 ✗ return AVERROR_INVALIDDATA;
187
188 324629 p = strip->v1_codebook[*data++];
189
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 324629 if (s->palette_video) {
190 ✗ ip3[0] = ip3[1] = ip2[0] = ip2[1] = p[6];
191 ✗ ip3[2] = ip3[3] = ip2[2] = ip2[3] = p[9];
192 ✗ ip1[0] = ip1[1] = ip0[0] = ip0[1] = p[0];
193 ✗ ip1[2] = ip1[3] = ip0[2] = ip0[3] = p[3];
194 } else {
195 324629 p += 6;
196 324629 memcpy(ip3 + 0, p, 3); memcpy(ip3 + 3, p, 3);
197 324629 memcpy(ip2 + 0, p, 3); memcpy(ip2 + 3, p, 3);
198 324629 p += 3; /* ... + 9 */
199 324629 memcpy(ip3 + 6, p, 3); memcpy(ip3 + 9, p, 3);
200 324629 memcpy(ip2 + 6, p, 3); memcpy(ip2 + 9, p, 3);
201 324629 p -= 9; /* ... + 0 */
202 324629 memcpy(ip1 + 0, p, 3); memcpy(ip1 + 3, p, 3);
203 324629 memcpy(ip0 + 0, p, 3); memcpy(ip0 + 3, p, 3);
204 324629 p += 3; /* ... + 3 */
205 324629 memcpy(ip1 + 6, p, 3); memcpy(ip1 + 9, p, 3);
206 324629 memcpy(ip0 + 6, p, 3); memcpy(ip0 + 9, p, 3);
207 }
208
209
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 682336 } else if (flag & mask) {
210
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 682336 if ((data + 4) > eod)
211 3 return AVERROR_INVALIDDATA;
212
213 682333 cb0 = strip->v4_codebook[*data++];
214 682333 cb1 = strip->v4_codebook[*data++];
215 682333 cb2 = strip->v4_codebook[*data++];
216 682333 cb3 = strip->v4_codebook[*data++];
217
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 682333 if (s->palette_video) {
218 uint8_t *p;
219 66297 p = ip3;
220 66297 *p++ = cb2[6];
221 66297 *p++ = cb2[9];
222 66297 *p++ = cb3[6];
223 66297 *p = cb3[9];
224 66297 p = ip2;
225 66297 *p++ = cb2[0];
226 66297 *p++ = cb2[3];
227 66297 *p++ = cb3[0];
228 66297 *p = cb3[3];
229 66297 p = ip1;
230 66297 *p++ = cb0[6];
231 66297 *p++ = cb0[9];
232 66297 *p++ = cb1[6];
233 66297 *p = cb1[9];
234 66297 p = ip0;
235 66297 *p++ = cb0[0];
236 66297 *p++ = cb0[3];
237 66297 *p++ = cb1[0];
238 66297 *p = cb1[3];
239 } else {
240 616036 memcpy(ip3 + 0, cb2 + 6, 6);
241 616036 memcpy(ip3 + 6, cb3 + 6, 6);
242 616036 memcpy(ip2 + 0, cb2 + 0, 6);
243 616036 memcpy(ip2 + 6, cb3 + 0, 6);
244 616036 memcpy(ip1 + 0, cb0 + 6, 6);
245 616036 memcpy(ip1 + 6, cb1 + 6, 6);
246 616036 memcpy(ip0 + 0, cb0 + 0, 6);
247 616036 memcpy(ip0 + 6, cb1 + 0, 6);
248 }
249
250 }
251 }
252
253
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 1481917 if (s->palette_video) {
254 66297 ip0 += 4; ip1 += 4;
255 66297 ip2 += 4; ip3 += 4;
256 } else {
257 1415620 ip0 += 12; ip1 += 12;
258 1415620 ip2 += 12; ip3 += 12;
259 }
260 }
261 }
262
263 1189 return 0;
264 }
265
266 1192 static int cinepak_decode_strip (CinepakContext *s,
267 cvid_strip *strip, const uint8_t *data, int size)
268 {
269 1192 const uint8_t *eod = (data + size);
270 int chunk_id, chunk_size;
271
272 /* coordinate sanity checks */
273
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 1192 if (strip->x2 > s->width ||
274
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 1192 strip->y2 > s->height ||
275
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 1192 strip->x1 >= strip->x2 || strip->y1 >= strip->y2)
276 ✗ return AVERROR_INVALIDDATA;
277
278
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 3576 while ((data + 4) <= eod) {
279 3576 chunk_id = data[0];
280 3576 chunk_size = AV_RB24 (&data[1]) - 4;
281
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 3576 if(chunk_size < 0)
282 ✗ return AVERROR_INVALIDDATA;
283
284 3576 data += 4;
285
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 3576 chunk_size = ((data + chunk_size) > eod) ? (eod - data) : chunk_size;
286
287
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 3576 switch (chunk_id) {
288
289 1192 case 0x20:
290 case 0x21:
291 case 0x24:
292 case 0x25:
293 1192 cinepak_decode_codebook (strip->v4_codebook, chunk_id,
294 chunk_size, data);
295 1192 break;
296
297 1192 case 0x22:
298 case 0x23:
299 case 0x26:
300 case 0x27:
301 1192 cinepak_decode_codebook (strip->v1_codebook, chunk_id,
302 chunk_size, data);
303 1192 break;
304
305 1192 case 0x30:
306 case 0x31:
307 case 0x32:
308 1192 return cinepak_decode_vectors (s, strip, chunk_id,
309 chunk_size, data);
310 }
311
312 2384 data += chunk_size;
313 }
314
315 ✗ return AVERROR_INVALIDDATA;
316 }
317
318 626 static int cinepak_predecode_check (CinepakContext *s)
319 {
320 int num_strips;
321 int encoded_buf_size;
322
323 626 num_strips = AV_RB16 (&s->data[8]);
324 626 encoded_buf_size = AV_RB24(&s->data[1]);
325
326
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 626 if (s->size < encoded_buf_size * (int64_t)(100 - s->avctx->discard_damaged_percentage) / 100)
327 ✗ return AVERROR_INVALIDDATA;
328
329 /* if this is the first frame, check for deviant Sega FILM data */
330
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 626 if (s->sega_film_skip_bytes == -1) {
331
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 8 if (!encoded_buf_size) {
332 ✗ avpriv_request_sample(s->avctx, "encoded_buf_size 0");
333 ✗ return AVERROR_PATCHWELCOME;
334 }
335
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 8 if (encoded_buf_size != s->size && (s->size % encoded_buf_size) != 0) {
336 /* If the encoded frame size differs from the frame size as indicated
337 * by the container file, this data likely comes from a Sega FILM/CPK file.
338 * If the frame header is followed by the bytes FE 00 00 06 00 00 then
339 * this is probably one of the two known files that have 6 extra bytes
340 * after the frame header. Else, assume 2 extra bytes. The container
341 * size also cannot be a multiple of the encoded size. */
342
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 1 if (s->size >= 16 &&
343
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 1 (s->data[10] == 0xFE) &&
344 ✗ (s->data[11] == 0x00) &&
345 ✗ (s->data[12] == 0x00) &&
346 ✗ (s->data[13] == 0x06) &&
347 ✗ (s->data[14] == 0x00) &&
348 ✗ (s->data[15] == 0x00))
349 ✗ s->sega_film_skip_bytes = 6;
350 else
351 1 s->sega_film_skip_bytes = 2;
352 } else
353 7 s->sega_film_skip_bytes = 0;
354 }
355
356
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 626 if (s->size < 10 + s->sega_film_skip_bytes + num_strips * 12)
357 ✗ return AVERROR_INVALIDDATA;
358
359
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 626 if (num_strips) {
360 626 const uint8_t *data = s->data + 10 + s->sega_film_skip_bytes;
361 626 int strip_size = AV_RB24 (data + 1);
362
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 626 if (strip_size < 12 || strip_size > encoded_buf_size)
363 ✗ return AVERROR_INVALIDDATA;
364 }
365
366 626 return 0;
367 }
368
369 626 static int cinepak_decode (CinepakContext *s)
370 {
371 626 const uint8_t *eod = (s->data + s->size);
372 int i, result, strip_size, frame_flags, num_strips;
373 626 int y0 = 0;
374
375 626 frame_flags = s->data[0];
376 626 num_strips = AV_RB16 (&s->data[8]);
377
378 626 s->data += 10 + s->sega_film_skip_bytes;
379
380 626 num_strips = FFMIN(num_strips, MAX_STRIPS);
381
382 626 s->frame->flags &= ~AV_FRAME_FLAG_KEY;
383
384
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 1815 for (i=0; i < num_strips; i++) {
385
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 1192 if ((s->data + 12) > eod)
386 ✗ return AVERROR_INVALIDDATA;
387
388 1192 s->strips[i].id = s->data[0];
389 /* zero y1 means "relative to the previous stripe" */
390
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 1192 if (!(s->strips[i].y1 = AV_RB16 (&s->data[4])))
391 1192 s->strips[i].y2 = (s->strips[i].y1 = y0) + AV_RB16 (&s->data[8]);
392 else
393 ✗ s->strips[i].y2 = AV_RB16 (&s->data[8]);
394 1192 s->strips[i].x1 = AV_RB16 (&s->data[6]);
395 1192 s->strips[i].x2 = AV_RB16 (&s->data[10]);
396
397
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 1192 if (s->strips[i].id == 0x10)
398 146 s->frame->flags |= AV_FRAME_FLAG_KEY;
399
400 1192 strip_size = AV_RB24 (&s->data[1]) - 12;
401
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 1192 if (strip_size < 0)
402 ✗ return AVERROR_INVALIDDATA;
403 1192 s->data += 12;
404
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 1192 strip_size = ((s->data + strip_size) > eod) ? (eod - s->data) : strip_size;
405
406
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 1192 if ((i > 0) && !(frame_flags & 0x01)) {
407 77 memcpy (s->strips[i].v4_codebook, s->strips[i-1].v4_codebook,
408 sizeof(s->strips[i].v4_codebook));
409 77 memcpy (s->strips[i].v1_codebook, s->strips[i-1].v1_codebook,
410 sizeof(s->strips[i].v1_codebook));
411 }
412
413 1192 result = cinepak_decode_strip (s, &s->strips[i], s->data, strip_size);
414
415
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 1192 if (result != 0)
416 3 return result;
417
418 1189 s->data += strip_size;
419 1189 y0 = s->strips[i].y2;
420 }
421 623 return 0;
422 }
423
424 22 static av_cold int cinepak_decode_init(AVCodecContext *avctx)
425 {
426 22 CinepakContext *s = avctx->priv_data;
427
428 22 s->avctx = avctx;
429 22 s->width = (avctx->width + 3) & ~3;
430 22 s->height = (avctx->height + 3) & ~3;
431
432 22 s->sega_film_skip_bytes = -1; /* uninitialized state */
433
434 // check for paletted data
435
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 22 if (avctx->bits_per_coded_sample != 8) {
436 20 s->palette_video = 0;
437 20 avctx->pix_fmt = AV_PIX_FMT_RGB24;
438 } else {
439 2 s->palette_video = 1;
440 2 avctx->pix_fmt = AV_PIX_FMT_PAL8;
441 }
442
443 22 s->frame = av_frame_alloc();
444
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 22 if (!s->frame)
445 ✗ return AVERROR(ENOMEM);
446
447 22 return 0;
448 }
449
450 626 static int cinepak_decode_frame(AVCodecContext *avctx, AVFrame *rframe,
451 int *got_frame, AVPacket *avpkt)
452 {
453 626 const uint8_t *buf = avpkt->data;
454 626 int ret = 0, buf_size = avpkt->size;
455 626 CinepakContext *s = avctx->priv_data;
456 int num_strips;
457
458 626 s->data = buf;
459 626 s->size = buf_size;
460
461
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 626 if (s->size < 10)
462 ✗ return AVERROR_INVALIDDATA;
463
464 626 num_strips = AV_RB16 (&s->data[8]);
465
466 //Empty frame, do not waste time
467
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 626 if (!num_strips && (!s->palette_video || !av_packet_get_side_data(avpkt, AV_PKT_DATA_PALETTE, NULL)))
468 ✗ return buf_size;
469
470
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 626 if ((ret = cinepak_predecode_check(s)) < 0) {
471 ✗ av_log(avctx, AV_LOG_ERROR, "cinepak_predecode_check failed\n");
472 ✗ return ret;
473 }
474
475
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 626 if ((ret = ff_reget_buffer(avctx, s->frame, 0)) < 0)
476 ✗ return ret;
477
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 626 if (s->palette_video) {
479 56 ff_copy_palette(s->pal, avpkt, avctx);
480 }
481
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 626 if ((ret = cinepak_decode(s)) < 0) {
483 3 av_log(avctx, AV_LOG_ERROR, "cinepak_decode failed\n");
484 }
485
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 626 if (s->palette_video)
487 56 memcpy (s->frame->data[1], s->pal, AVPALETTE_SIZE);
488
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 626 if ((ret = av_frame_ref(rframe, s->frame)) < 0)
490 ✗ return ret;
491
492 626 *got_frame = 1;
493
494 /* report that the buffer was completely consumed */
495 626 return buf_size;
496 }
497
498 22 static av_cold int cinepak_decode_end(AVCodecContext *avctx)
499 {
500 22 CinepakContext *s = avctx->priv_data;
501
502 22 av_frame_free(&s->frame);
503
504 22 return 0;
505 }
506
507 const FFCodec ff_cinepak_decoder = {
508 .p.name = "cinepak",
509 CODEC_LONG_NAME("Cinepak"),
510 .p.type = AVMEDIA_TYPE_VIDEO,
511 .p.id = AV_CODEC_ID_CINEPAK,
512 .priv_data_size = sizeof(CinepakContext),
513 .init = cinepak_decode_init,
514 .close = cinepak_decode_end,
515 FF_CODEC_DECODE_CB(cinepak_decode_frame),
516 .p.capabilities = AV_CODEC_CAP_DR1,
517 };
518