FFmpeg coverage


Directory: ../../../ffmpeg/
File: src/libavcodec/cinepak.c
Date: 2022-07-05 19:52:29
Exec Total Coverage
Lines: 223 254 87.8%
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 <stdlib.h>
38 #include <string.h>
39
40 #include "libavutil/common.h"
41 #include "libavutil/intreadwrite.h"
42 #include "avcodec.h"
43 #include "codec_internal.h"
44 #include "decode.h"
45 #include "internal.h"
46
47
48 typedef uint8_t cvid_codebook[12];
49
50 #define MAX_STRIPS 32
51
52 typedef struct cvid_strip {
53 uint16_t id;
54 uint16_t x1, y1;
55 uint16_t x2, y2;
56 cvid_codebook v4_codebook[256];
57 cvid_codebook v1_codebook[256];
58 } cvid_strip;
59
60 typedef struct CinepakContext {
61
62 AVCodecContext *avctx;
63 AVFrame *frame;
64
65 const unsigned char *data;
66 int size;
67
68 int width, height;
69
70 int palette_video;
71 cvid_strip strips[MAX_STRIPS];
72
73 int sega_film_skip_bytes;
74
75 uint32_t pal[256];
76 } CinepakContext;
77
78 2070 static void cinepak_decode_codebook (cvid_codebook *codebook,
79 int chunk_id, int size, const uint8_t *data)
80 {
81 2070 const uint8_t *eod = (data + size);
82 uint32_t flag, mask;
83 int i, n;
84 uint8_t *p;
85
86 /* check if this chunk contains 4- or 6-element vectors */
87
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2070 n = (chunk_id & 0x04) ? 4 : 6;
88 2070 flag = 0;
89 2070 mask = 0;
90
91 2070 p = codebook[0];
92
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376213 for (i=0; i < 256; i++) {
93
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374848 if ((chunk_id & 0x01) && !(mask >>= 1)) {
94
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6919 if ((data + 4) > eod)
95 127 break;
96
97 6792 flag = AV_RB32 (data);
98 6792 data += 4;
99 6792 mask = 0x80000000;
100 }
101
102
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608510 if (!(chunk_id & 0x01) || (flag & mask)) {
103 int k, kk;
104
105
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234367 if ((data + n) > eod)
106 578 break;
107
108
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1168945 for (k = 0; k < 4; ++k) {
109 935156 int r = *data++;
110
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3740624 for (kk = 0; kk < 3; ++kk)
111 2805468 *p++ = r;
112 }
113
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233789 if (n == 6) {
114 int r, g, b, u, v;
115 211134 u = *(int8_t *)data++;
116 211134 v = *(int8_t *)data++;
117 211134 p -= 12;
118
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1055670 for(k=0; k<4; ++k) {
119 844536 r = *p++ + v*2;
120 844536 g = *p++ - (u/2) - v;
121 844536 b = *p + u*2;
122 844536 p -= 2;
123 844536 *p++ = av_clip_uint8(r);
124 844536 *p++ = av_clip_uint8(g);
125 844536 *p++ = av_clip_uint8(b);
126 }
127 }
128 } else {
129 140354 p += 12;
130 }
131 }
132 2070 }
133
134 1035 static int cinepak_decode_vectors (CinepakContext *s, cvid_strip *strip,
135 int chunk_id, int size, const uint8_t *data)
136 {
137 1035 const uint8_t *eod = (data + size);
138 uint32_t flag, mask;
139 uint8_t *cb0, *cb1, *cb2, *cb3;
140 int x, y;
141 char *ip0, *ip1, *ip2, *ip3;
142
143 1035 flag = 0;
144 1035 mask = 0;
145
146
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19017 for (y=strip->y1; y < strip->y2; y+=4) {
147
148 /* take care of y dimension not being multiple of 4, such streams exist */
149 35968 ip0 = ip1 = ip2 = ip3 = s->frame->data[0] +
150
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17984 (s->palette_video?strip->x1:strip->x1*3) + (y * s->frame->linesize[0]);
151
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17984 if(s->avctx->height - y > 1) {
152 17984 ip1 = ip0 + s->frame->linesize[0];
153
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17984 if(s->avctx->height - y > 2) {
154 17984 ip2 = ip1 + s->frame->linesize[0];
155
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17984 if(s->avctx->height - y > 3) {
156 17754 ip3 = ip2 + s->frame->linesize[0];
157 }
158 }
159 }
160 /* to get the correct picture for not-multiple-of-4 cases let us fill each
161 * block from the bottom up, thus possibly overwriting the bottommost line
162 * more than once but ending with the correct data in place
163 * (instead of in-loop checking) */
164
165
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1132191 for (x=strip->x1; x < strip->x2; x+=4) {
166
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1114209 if ((chunk_id & 0x01) && !(mask >>= 1)) {
167
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27954 if ((data + 4) > eod)
168 return AVERROR_INVALIDDATA;
169
170 27954 flag = AV_RB32 (data);
171 27954 data += 4;
172 27954 mask = 0x80000000;
173 }
174
175
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1114209 if (!(chunk_id & 0x01) || (flag & mask)) {
176
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785916 if (!(chunk_id & 0x02) && !(mask >>= 1)) {
177
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23418 if ((data + 4) > eod)
178 return AVERROR_INVALIDDATA;
179
180 23418 flag = AV_RB32 (data);
181 23418 data += 4;
182 23418 mask = 0x80000000;
183 }
184
185
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1041354 if ((chunk_id & 0x02) || (~flag & mask)) {
186 uint8_t *p;
187
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255438 if (data >= eod)
188 return AVERROR_INVALIDDATA;
189
190 255438 p = strip->v1_codebook[*data++];
191
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255438 if (s->palette_video) {
192 ip3[0] = ip3[1] = ip2[0] = ip2[1] = p[6];
193 ip3[2] = ip3[3] = ip2[2] = ip2[3] = p[9];
194 ip1[0] = ip1[1] = ip0[0] = ip0[1] = p[0];
195 ip1[2] = ip1[3] = ip0[2] = ip0[3] = p[3];
196 } else {
197 255438 p += 6;
198 255438 memcpy(ip3 + 0, p, 3); memcpy(ip3 + 3, p, 3);
199 255438 memcpy(ip2 + 0, p, 3); memcpy(ip2 + 3, p, 3);
200 255438 p += 3; /* ... + 9 */
201 255438 memcpy(ip3 + 6, p, 3); memcpy(ip3 + 9, p, 3);
202 255438 memcpy(ip2 + 6, p, 3); memcpy(ip2 + 9, p, 3);
203 255438 p -= 9; /* ... + 0 */
204 255438 memcpy(ip1 + 0, p, 3); memcpy(ip1 + 3, p, 3);
205 255438 memcpy(ip0 + 0, p, 3); memcpy(ip0 + 3, p, 3);
206 255438 p += 3; /* ... + 3 */
207 255438 memcpy(ip1 + 6, p, 3); memcpy(ip1 + 9, p, 3);
208 255438 memcpy(ip0 + 6, p, 3); memcpy(ip0 + 9, p, 3);
209 }
210
211
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530478 } else if (flag & mask) {
212
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530478 if ((data + 4) > eod)
213 2 return AVERROR_INVALIDDATA;
214
215 530476 cb0 = strip->v4_codebook[*data++];
216 530476 cb1 = strip->v4_codebook[*data++];
217 530476 cb2 = strip->v4_codebook[*data++];
218 530476 cb3 = strip->v4_codebook[*data++];
219
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530476 if (s->palette_video) {
220 uint8_t *p;
221 66297 p = ip3;
222 66297 *p++ = cb2[6];
223 66297 *p++ = cb2[9];
224 66297 *p++ = cb3[6];
225 66297 *p = cb3[9];
226 66297 p = ip2;
227 66297 *p++ = cb2[0];
228 66297 *p++ = cb2[3];
229 66297 *p++ = cb3[0];
230 66297 *p = cb3[3];
231 66297 p = ip1;
232 66297 *p++ = cb0[6];
233 66297 *p++ = cb0[9];
234 66297 *p++ = cb1[6];
235 66297 *p = cb1[9];
236 66297 p = ip0;
237 66297 *p++ = cb0[0];
238 66297 *p++ = cb0[3];
239 66297 *p++ = cb1[0];
240 66297 *p = cb1[3];
241 } else {
242 464179 memcpy(ip3 + 0, cb2 + 6, 6);
243 464179 memcpy(ip3 + 6, cb3 + 6, 6);
244 464179 memcpy(ip2 + 0, cb2 + 0, 6);
245 464179 memcpy(ip2 + 6, cb3 + 0, 6);
246 464179 memcpy(ip1 + 0, cb0 + 6, 6);
247 464179 memcpy(ip1 + 6, cb1 + 6, 6);
248 464179 memcpy(ip0 + 0, cb0 + 0, 6);
249 464179 memcpy(ip0 + 6, cb1 + 0, 6);
250 }
251
252 }
253 }
254
255
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1114207 if (s->palette_video) {
256 66297 ip0 += 4; ip1 += 4;
257 66297 ip2 += 4; ip3 += 4;
258 } else {
259 1047910 ip0 += 12; ip1 += 12;
260 1047910 ip2 += 12; ip3 += 12;
261 }
262 }
263 }
264
265 1033 return 0;
266 }
267
268 1035 static int cinepak_decode_strip (CinepakContext *s,
269 cvid_strip *strip, const uint8_t *data, int size)
270 {
271 1035 const uint8_t *eod = (data + size);
272 int chunk_id, chunk_size;
273
274 /* coordinate sanity checks */
275
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1035 if (strip->x2 > s->width ||
276
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1035 strip->y2 > s->height ||
277
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1035 strip->x1 >= strip->x2 || strip->y1 >= strip->y2)
278 return AVERROR_INVALIDDATA;
279
280
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3105 while ((data + 4) <= eod) {
281 3105 chunk_id = data[0];
282 3105 chunk_size = AV_RB24 (&data[1]) - 4;
283
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3105 if(chunk_size < 0)
284 return AVERROR_INVALIDDATA;
285
286 3105 data += 4;
287
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3105 chunk_size = ((data + chunk_size) > eod) ? (eod - data) : chunk_size;
288
289
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3105 switch (chunk_id) {
290
291 1035 case 0x20:
292 case 0x21:
293 case 0x24:
294 case 0x25:
295 1035 cinepak_decode_codebook (strip->v4_codebook, chunk_id,
296 chunk_size, data);
297 1035 break;
298
299 1035 case 0x22:
300 case 0x23:
301 case 0x26:
302 case 0x27:
303 1035 cinepak_decode_codebook (strip->v1_codebook, chunk_id,
304 chunk_size, data);
305 1035 break;
306
307 1035 case 0x30:
308 case 0x31:
309 case 0x32:
310 1035 return cinepak_decode_vectors (s, strip, chunk_id,
311 chunk_size, data);
312 }
313
314 2070 data += chunk_size;
315 }
316
317 return AVERROR_INVALIDDATA;
318 }
319
320 547 static int cinepak_predecode_check (CinepakContext *s)
321 {
322 int num_strips;
323 int encoded_buf_size;
324
325 547 num_strips = AV_RB16 (&s->data[8]);
326 547 encoded_buf_size = AV_RB24(&s->data[1]);
327
328
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547 if (s->size < encoded_buf_size * (int64_t)(100 - s->avctx->discard_damaged_percentage) / 100)
329 return AVERROR_INVALIDDATA;
330
331 /* if this is the first frame, check for deviant Sega FILM data */
332
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547 if (s->sega_film_skip_bytes == -1) {
333
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7 if (!encoded_buf_size) {
334 avpriv_request_sample(s->avctx, "encoded_buf_size 0");
335 return AVERROR_PATCHWELCOME;
336 }
337
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7 if (encoded_buf_size != s->size && (s->size % encoded_buf_size) != 0) {
338 /* If the encoded frame size differs from the frame size as indicated
339 * by the container file, this data likely comes from a Sega FILM/CPK file.
340 * If the frame header is followed by the bytes FE 00 00 06 00 00 then
341 * this is probably one of the two known files that have 6 extra bytes
342 * after the frame header. Else, assume 2 extra bytes. The container
343 * size also cannot be a multiple of the encoded size. */
344
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1 if (s->size >= 16 &&
345
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1 (s->data[10] == 0xFE) &&
346 (s->data[11] == 0x00) &&
347 (s->data[12] == 0x00) &&
348 (s->data[13] == 0x06) &&
349 (s->data[14] == 0x00) &&
350 (s->data[15] == 0x00))
351 s->sega_film_skip_bytes = 6;
352 else
353 1 s->sega_film_skip_bytes = 2;
354 } else
355 6 s->sega_film_skip_bytes = 0;
356 }
357
358
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547 if (s->size < 10 + s->sega_film_skip_bytes + num_strips * 12)
359 return AVERROR_INVALIDDATA;
360
361
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547 if (num_strips) {
362 547 const uint8_t *data = s->data + 10 + s->sega_film_skip_bytes;
363 547 int strip_size = AV_RB24 (data + 1);
364
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547 if (strip_size < 12 || strip_size > encoded_buf_size)
365 return AVERROR_INVALIDDATA;
366 }
367
368 547 return 0;
369 }
370
371 547 static int cinepak_decode (CinepakContext *s)
372 {
373 547 const uint8_t *eod = (s->data + s->size);
374 int i, result, strip_size, frame_flags, num_strips;
375 547 int y0 = 0;
376
377 547 frame_flags = s->data[0];
378 547 num_strips = AV_RB16 (&s->data[8]);
379
380 547 s->data += 10 + s->sega_film_skip_bytes;
381
382 547 num_strips = FFMIN(num_strips, MAX_STRIPS);
383
384 547 s->frame->key_frame = 0;
385
386
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1580 for (i=0; i < num_strips; i++) {
387
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1035 if ((s->data + 12) > eod)
388 return AVERROR_INVALIDDATA;
389
390 1035 s->strips[i].id = s->data[0];
391 /* zero y1 means "relative to the previous stripe" */
392
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1035 if (!(s->strips[i].y1 = AV_RB16 (&s->data[4])))
393 1035 s->strips[i].y2 = (s->strips[i].y1 = y0) + AV_RB16 (&s->data[8]);
394 else
395 s->strips[i].y2 = AV_RB16 (&s->data[8]);
396 1035 s->strips[i].x1 = AV_RB16 (&s->data[6]);
397 1035 s->strips[i].x2 = AV_RB16 (&s->data[10]);
398
399
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1035 if (s->strips[i].id == 0x10)
400 136 s->frame->key_frame = 1;
401
402 1035 strip_size = AV_RB24 (&s->data[1]) - 12;
403
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1035 if (strip_size < 0)
404 return AVERROR_INVALIDDATA;
405 1035 s->data += 12;
406
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1035 strip_size = ((s->data + strip_size) > eod) ? (eod - s->data) : strip_size;
407
408
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1035 if ((i > 0) && !(frame_flags & 0x01)) {
409 67 memcpy (s->strips[i].v4_codebook, s->strips[i-1].v4_codebook,
410 sizeof(s->strips[i].v4_codebook));
411 67 memcpy (s->strips[i].v1_codebook, s->strips[i-1].v1_codebook,
412 sizeof(s->strips[i].v1_codebook));
413 }
414
415 1035 result = cinepak_decode_strip (s, &s->strips[i], s->data, strip_size);
416
417
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1035 if (result != 0)
418 2 return result;
419
420 1033 s->data += strip_size;
421 1033 y0 = s->strips[i].y2;
422 }
423 545 return 0;
424 }
425
426 14 static av_cold int cinepak_decode_init(AVCodecContext *avctx)
427 {
428 14 CinepakContext *s = avctx->priv_data;
429
430 14 s->avctx = avctx;
431 14 s->width = (avctx->width + 3) & ~3;
432 14 s->height = (avctx->height + 3) & ~3;
433
434 14 s->sega_film_skip_bytes = -1; /* uninitialized state */
435
436 // check for paletted data
437
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14 if (avctx->bits_per_coded_sample != 8) {
438 12 s->palette_video = 0;
439 12 avctx->pix_fmt = AV_PIX_FMT_RGB24;
440 } else {
441 2 s->palette_video = 1;
442 2 avctx->pix_fmt = AV_PIX_FMT_PAL8;
443 }
444
445 14 s->frame = av_frame_alloc();
446
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14 if (!s->frame)
447 return AVERROR(ENOMEM);
448
449 14 return 0;
450 }
451
452 547 static int cinepak_decode_frame(AVCodecContext *avctx, AVFrame *rframe,
453 int *got_frame, AVPacket *avpkt)
454 {
455 547 const uint8_t *buf = avpkt->data;
456 547 int ret = 0, buf_size = avpkt->size;
457 547 CinepakContext *s = avctx->priv_data;
458 int num_strips;
459
460 547 s->data = buf;
461 547 s->size = buf_size;
462
463
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547 if (s->size < 10)
464 return AVERROR_INVALIDDATA;
465
466 547 num_strips = AV_RB16 (&s->data[8]);
467
468 //Empty frame, do not waste time
469
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547 if (!num_strips && (!s->palette_video || !av_packet_get_side_data(avpkt, AV_PKT_DATA_PALETTE, NULL)))
470 return buf_size;
471
472
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547 if ((ret = cinepak_predecode_check(s)) < 0) {
473 av_log(avctx, AV_LOG_ERROR, "cinepak_predecode_check failed\n");
474 return ret;
475 }
476
477
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547 if ((ret = ff_reget_buffer(avctx, s->frame, 0)) < 0)
478 return ret;
479
480
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547 if (s->palette_video) {
481 56 s->frame->palette_has_changed = ff_copy_palette(s->pal, avpkt, avctx);
482 }
483
484
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547 if ((ret = cinepak_decode(s)) < 0) {
485 2 av_log(avctx, AV_LOG_ERROR, "cinepak_decode failed\n");
486 }
487
488
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547 if (s->palette_video)
489 56 memcpy (s->frame->data[1], s->pal, AVPALETTE_SIZE);
490
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547 if ((ret = av_frame_ref(rframe, s->frame)) < 0)
492 return ret;
493
494 547 *got_frame = 1;
495
496 /* report that the buffer was completely consumed */
497 547 return buf_size;
498 }
499
500 14 static av_cold int cinepak_decode_end(AVCodecContext *avctx)
501 {
502 14 CinepakContext *s = avctx->priv_data;
503
504 14 av_frame_free(&s->frame);
505
506 14 return 0;
507 }
508
509 const FFCodec ff_cinepak_decoder = {
510 .p.name = "cinepak",
511 .p.long_name = NULL_IF_CONFIG_SMALL("Cinepak"),
512 .p.type = AVMEDIA_TYPE_VIDEO,
513 .p.id = AV_CODEC_ID_CINEPAK,
514 .priv_data_size = sizeof(CinepakContext),
515 .init = cinepak_decode_init,
516 .close = cinepak_decode_end,
517 FF_CODEC_DECODE_CB(cinepak_decode_frame),
518 .p.capabilities = AV_CODEC_CAP_DR1,
519 .caps_internal = FF_CODEC_CAP_INIT_THREADSAFE,
520 };
521