FFmpeg coverage

Directory: ../../../ffmpeg/
File: src/libavcodec/cinepak.c
Date: 2021-09-24 20:55:06
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 "decode.h"
44 #include "internal.h"
45
46
47 typedef uint8_t cvid_codebook[12];
48
49 #define MAX_STRIPS 32
50
51 typedef struct cvid_strip {
52 uint16_t id;
53 uint16_t x1, y1;
54 uint16_t x2, y2;
55 cvid_codebook v4_codebook[256];
56 cvid_codebook v1_codebook[256];
57 } cvid_strip;
58
59 typedef struct CinepakContext {
60
61 AVCodecContext *avctx;
62 AVFrame *frame;
63
64 const unsigned char *data;
65 int size;
66
67 int width, height;
68
69 int palette_video;
70 cvid_strip strips[MAX_STRIPS];
71
72 int sega_film_skip_bytes;
73
74 uint32_t pal[256];
75 } CinepakContext;
76
77 2070 static void cinepak_decode_codebook (cvid_codebook *codebook,
78 int chunk_id, int size, const uint8_t *data)
79 {
80 2070 const uint8_t *eod = (data + size);
81 uint32_t flag, mask;
82 int i, n;
83 uint8_t *p;
84
85 /* check if this chunk contains 4- or 6-element vectors */
86
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 2070 n = (chunk_id & 0x04) ? 4 : 6;
87 2070 flag = 0;
88 2070 mask = 0;
89
90 2070 p = codebook[0];
91
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 376233 for (i=0; i < 256; i++) {
92
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 374868 if ((chunk_id & 0x01) && !(mask >>= 1)) {
93
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 6919 if ((data + 4) > eod)
94 127 break;
95
96 6792 flag = AV_RB32 (data);
97 6792 data += 4;
98 6792 mask = 0x80000000;
99 }
100
101
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 608550 if (!(chunk_id & 0x01) || (flag & mask)) {
102 int k, kk;
103
104
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 234387 if ((data + n) > eod)
105 578 break;
106
107
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 1169045 for (k = 0; k < 4; ++k) {
108 935236 int r = *data++;
109
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 3740944 for (kk = 0; kk < 3; ++kk)
110 2805708 *p++ = r;
111 }
112
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 233809 if (n == 6) {
113 int r, g, b, u, v;
114 211154 u = *(int8_t *)data++;
115 211154 v = *(int8_t *)data++;
116 211154 p -= 12;
117
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 1055770 for(k=0; k<4; ++k) {
118 844616 r = *p++ + v*2;
119 844616 g = *p++ - (u/2) - v;
120 844616 b = *p + u*2;
121 844616 p -= 2;
122 844616 *p++ = av_clip_uint8(r);
123 844616 *p++ = av_clip_uint8(g);
124 844616 *p++ = av_clip_uint8(b);
125 }
126 }
127 } else {
128 140354 p += 12;
129 }
130 }
131 2070 }
132
133 1035 static int cinepak_decode_vectors (CinepakContext *s, cvid_strip *strip,
134 int chunk_id, int size, const uint8_t *data)
135 {
136 1035 const uint8_t *eod = (data + size);
137 uint32_t flag, mask;
138 uint8_t *cb0, *cb1, *cb2, *cb3;
139 int x, y;
140 char *ip0, *ip1, *ip2, *ip3;
141
142 1035 flag = 0;
143 1035 mask = 0;
144
145
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 19017 for (y=strip->y1; y < strip->y2; y+=4) {
146
147 /* take care of y dimension not being multiple of 4, such streams exist */
148 35968 ip0 = ip1 = ip2 = ip3 = s->frame->data[0] +
149
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 17984 (s->palette_video?strip->x1:strip->x1*3) + (y * s->frame->linesize[0]);
150
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 17984 if(s->avctx->height - y > 1) {
151 17984 ip1 = ip0 + s->frame->linesize[0];
152
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 17984 if(s->avctx->height - y > 2) {
153 17984 ip2 = ip1 + s->frame->linesize[0];
154
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 17984 if(s->avctx->height - y > 3) {
155 17754 ip3 = ip2 + s->frame->linesize[0];
156 }
157 }
158 }
159 /* to get the correct picture for not-multiple-of-4 cases let us fill each
160 * block from the bottom up, thus possibly overwriting the bottommost line
161 * more than once but ending with the correct data in place
162 * (instead of in-loop checking) */
163
164
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 1132191 for (x=strip->x1; x < strip->x2; x+=4) {
165
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 1114209 if ((chunk_id & 0x01) && !(mask >>= 1)) {
166
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 27974 if ((data + 4) > eod)
167 ✗ return AVERROR_INVALIDDATA;
168
169 27974 flag = AV_RB32 (data);
170 27974 data += 4;
171 27974 mask = 0x80000000;
172 }
173
174
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 1114209 if (!(chunk_id & 0x01) || (flag & mask)) {
175
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 785585 if (!(chunk_id & 0x02) && !(mask >>= 1)) {
176
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 23469 if ((data + 4) > eod)
177 ✗ return AVERROR_INVALIDDATA;
178
179 23469 flag = AV_RB32 (data);
180 23469 data += 4;
181 23469 mask = 0x80000000;
182 }
183
184
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 1041043 if ((chunk_id & 0x02) || (~flag & mask)) {
185 uint8_t *p;
186
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 255458 if (data >= eod)
187 ✗ return AVERROR_INVALIDDATA;
188
189 255458 p = strip->v1_codebook[*data++];
190
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 255458 if (s->palette_video) {
191 ✗ ip3[0] = ip3[1] = ip2[0] = ip2[1] = p[6];
192 ✗ ip3[2] = ip3[3] = ip2[2] = ip2[3] = p[9];
193 ✗ ip1[0] = ip1[1] = ip0[0] = ip0[1] = p[0];
194 ✗ ip1[2] = ip1[3] = ip0[2] = ip0[3] = p[3];
195 } else {
196 255458 p += 6;
197 255458 memcpy(ip3 + 0, p, 3); memcpy(ip3 + 3, p, 3);
198 255458 memcpy(ip2 + 0, p, 3); memcpy(ip2 + 3, p, 3);
199 255458 p += 3; /* ... + 9 */
200 255458 memcpy(ip3 + 6, p, 3); memcpy(ip3 + 9, p, 3);
201 255458 memcpy(ip2 + 6, p, 3); memcpy(ip2 + 9, p, 3);
202 255458 p -= 9; /* ... + 0 */
203 255458 memcpy(ip1 + 0, p, 3); memcpy(ip1 + 3, p, 3);
204 255458 memcpy(ip0 + 0, p, 3); memcpy(ip0 + 3, p, 3);
205 255458 p += 3; /* ... + 3 */
206 255458 memcpy(ip1 + 6, p, 3); memcpy(ip1 + 9, p, 3);
207 255458 memcpy(ip0 + 6, p, 3); memcpy(ip0 + 9, p, 3);
208 }
209
210
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 530127 } else if (flag & mask) {
211
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 530127 if ((data + 4) > eod)
212 2 return AVERROR_INVALIDDATA;
213
214 530125 cb0 = strip->v4_codebook[*data++];
215 530125 cb1 = strip->v4_codebook[*data++];
216 530125 cb2 = strip->v4_codebook[*data++];
217 530125 cb3 = strip->v4_codebook[*data++];
218
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 530125 if (s->palette_video) {
219 uint8_t *p;
220 66297 p = ip3;
221 66297 *p++ = cb2[6];
222 66297 *p++ = cb2[9];
223 66297 *p++ = cb3[6];
224 66297 *p = cb3[9];
225 66297 p = ip2;
226 66297 *p++ = cb2[0];
227 66297 *p++ = cb2[3];
228 66297 *p++ = cb3[0];
229 66297 *p = cb3[3];
230 66297 p = ip1;
231 66297 *p++ = cb0[6];
232 66297 *p++ = cb0[9];
233 66297 *p++ = cb1[6];
234 66297 *p = cb1[9];
235 66297 p = ip0;
236 66297 *p++ = cb0[0];
237 66297 *p++ = cb0[3];
238 66297 *p++ = cb1[0];
239 66297 *p = cb1[3];
240 } else {
241 463828 memcpy(ip3 + 0, cb2 + 6, 6);
242 463828 memcpy(ip3 + 6, cb3 + 6, 6);
243 463828 memcpy(ip2 + 0, cb2 + 0, 6);
244 463828 memcpy(ip2 + 6, cb3 + 0, 6);
245 463828 memcpy(ip1 + 0, cb0 + 6, 6);
246 463828 memcpy(ip1 + 6, cb1 + 6, 6);
247 463828 memcpy(ip0 + 0, cb0 + 0, 6);
248 463828 memcpy(ip0 + 6, cb1 + 0, 6);
249 }
250
251 }
252 }
253
254
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 1114207 if (s->palette_video) {
255 66297 ip0 += 4; ip1 += 4;
256 66297 ip2 += 4; ip3 += 4;
257 } else {
258 1047910 ip0 += 12; ip1 += 12;
259 1047910 ip2 += 12; ip3 += 12;
260 }
261 }
262 }
263
264 1033 return 0;
265 }
266
267 1035 static int cinepak_decode_strip (CinepakContext *s,
268 cvid_strip *strip, const uint8_t *data, int size)
269 {
270 1035 const uint8_t *eod = (data + size);
271 int chunk_id, chunk_size;
272
273 /* coordinate sanity checks */
274
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 1035 if (strip->x2 > s->width ||
275
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 1035 strip->y2 > s->height ||
276
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 1035 strip->x1 >= strip->x2 || strip->y1 >= strip->y2)
277 ✗ return AVERROR_INVALIDDATA;
278
279
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 3105 while ((data + 4) <= eod) {
280 3105 chunk_id = data[0];
281 3105 chunk_size = AV_RB24 (&data[1]) - 4;
282
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 3105 if(chunk_size < 0)
283 ✗ return AVERROR_INVALIDDATA;
284
285 3105 data += 4;
286
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 3105 chunk_size = ((data + chunk_size) > eod) ? (eod - data) : chunk_size;
287
288
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 3105 switch (chunk_id) {
289
290 1035 case 0x20:
291 case 0x21:
292 case 0x24:
293 case 0x25:
294 1035 cinepak_decode_codebook (strip->v4_codebook, chunk_id,
295 chunk_size, data);
296 1035 break;
297
298 1035 case 0x22:
299 case 0x23:
300 case 0x26:
301 case 0x27:
302 1035 cinepak_decode_codebook (strip->v1_codebook, chunk_id,
303 chunk_size, data);
304 1035 break;
305
306 1035 case 0x30:
307 case 0x31:
308 case 0x32:
309 1035 return cinepak_decode_vectors (s, strip, chunk_id,
310 chunk_size, data);
311 }
312
313 2070 data += chunk_size;
314 }
315
316 ✗ return AVERROR_INVALIDDATA;
317 }
318
319 547 static int cinepak_predecode_check (CinepakContext *s)
320 {
321 int num_strips;
322 int encoded_buf_size;
323
324 547 num_strips = AV_RB16 (&s->data[8]);
325 547 encoded_buf_size = AV_RB24(&s->data[1]);
326
327
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 547 if (s->size < encoded_buf_size * (int64_t)(100 - s->avctx->discard_damaged_percentage) / 100)
328 ✗ return AVERROR_INVALIDDATA;
329
330 /* if this is the first frame, check for deviant Sega FILM data */
331
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 547 if (s->sega_film_skip_bytes == -1) {
332
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 7 if (!encoded_buf_size) {
333 ✗ avpriv_request_sample(s->avctx, "encoded_buf_size 0");
334 ✗ return AVERROR_PATCHWELCOME;
335 }
336
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 7 if (encoded_buf_size != s->size && (s->size % encoded_buf_size) != 0) {
337 /* If the encoded frame size differs from the frame size as indicated
338 * by the container file, this data likely comes from a Sega FILM/CPK file.
339 * If the frame header is followed by the bytes FE 00 00 06 00 00 then
340 * this is probably one of the two known files that have 6 extra bytes
341 * after the frame header. Else, assume 2 extra bytes. The container
342 * size also cannot be a multiple of the encoded size. */
343
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 1 if (s->size >= 16 &&
344
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 1 (s->data[10] == 0xFE) &&
345 ✗ (s->data[11] == 0x00) &&
346 ✗ (s->data[12] == 0x00) &&
347 ✗ (s->data[13] == 0x06) &&
348 ✗ (s->data[14] == 0x00) &&
349 ✗ (s->data[15] == 0x00))
350 ✗ s->sega_film_skip_bytes = 6;
351 else
352 1 s->sega_film_skip_bytes = 2;
353 } else
354 6 s->sega_film_skip_bytes = 0;
355 }
356
357
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 547 if (s->size < 10 + s->sega_film_skip_bytes + num_strips * 12)
358 ✗ return AVERROR_INVALIDDATA;
359
360
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 547 if (num_strips) {
361 547 const uint8_t *data = s->data + 10 + s->sega_film_skip_bytes;
362 547 int strip_size = AV_RB24 (data + 1);
363
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 547 if (strip_size < 12 || strip_size > encoded_buf_size)
364 ✗ return AVERROR_INVALIDDATA;
365 }
366
367 547 return 0;
368 }
369
370 547 static int cinepak_decode (CinepakContext *s)
371 {
372 547 const uint8_t *eod = (s->data + s->size);
373 int i, result, strip_size, frame_flags, num_strips;
374 547 int y0 = 0;
375
376 547 frame_flags = s->data[0];
377 547 num_strips = AV_RB16 (&s->data[8]);
378
379 547 s->data += 10 + s->sega_film_skip_bytes;
380
381 547 num_strips = FFMIN(num_strips, MAX_STRIPS);
382
383 547 s->frame->key_frame = 0;
384
385
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 1580 for (i=0; i < num_strips; i++) {
386
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 1035 if ((s->data + 12) > eod)
387 ✗ return AVERROR_INVALIDDATA;
388
389 1035 s->strips[i].id = s->data[0];
390 /* zero y1 means "relative to the previous stripe" */
391
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 1035 if (!(s->strips[i].y1 = AV_RB16 (&s->data[4])))
392 1035 s->strips[i].y2 = (s->strips[i].y1 = y0) + AV_RB16 (&s->data[8]);
393 else
394 ✗ s->strips[i].y2 = AV_RB16 (&s->data[8]);
395 1035 s->strips[i].x1 = AV_RB16 (&s->data[6]);
396 1035 s->strips[i].x2 = AV_RB16 (&s->data[10]);
397
398
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 1035 if (s->strips[i].id == 0x10)
399 115 s->frame->key_frame = 1;
400
401 1035 strip_size = AV_RB24 (&s->data[1]) - 12;
402
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 1035 if (strip_size < 0)
403 ✗ return AVERROR_INVALIDDATA;
404 1035 s->data += 12;
405
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 1035 strip_size = ((s->data + strip_size) > eod) ? (eod - s->data) : strip_size;
406
407
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 1035 if ((i > 0) && !(frame_flags & 0x01)) {
408 49 memcpy (s->strips[i].v4_codebook, s->strips[i-1].v4_codebook,
409 sizeof(s->strips[i].v4_codebook));
410 49 memcpy (s->strips[i].v1_codebook, s->strips[i-1].v1_codebook,
411 sizeof(s->strips[i].v1_codebook));
412 }
413
414 1035 result = cinepak_decode_strip (s, &s->strips[i], s->data, strip_size);
415
416
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 1035 if (result != 0)
417 2 return result;
418
419 1033 s->data += strip_size;
420 1033 y0 = s->strips[i].y2;
421 }
422 545 return 0;
423 }
424
425 14 static av_cold int cinepak_decode_init(AVCodecContext *avctx)
426 {
427 14 CinepakContext *s = avctx->priv_data;
428
429 14 s->avctx = avctx;
430 14 s->width = (avctx->width + 3) & ~3;
431 14 s->height = (avctx->height + 3) & ~3;
432
433 14 s->sega_film_skip_bytes = -1; /* uninitialized state */
434
435 // check for paletted data
436
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 14 if (avctx->bits_per_coded_sample != 8) {
437 12 s->palette_video = 0;
438 12 avctx->pix_fmt = AV_PIX_FMT_RGB24;
439 } else {
440 2 s->palette_video = 1;
441 2 avctx->pix_fmt = AV_PIX_FMT_PAL8;
442 }
443
444 14 s->frame = av_frame_alloc();
445
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 14 if (!s->frame)
446 ✗ return AVERROR(ENOMEM);
447
448 14 return 0;
449 }
450
451 547 static int cinepak_decode_frame(AVCodecContext *avctx,
452 void *data, int *got_frame,
453 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
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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
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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(data, 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 AVCodec ff_cinepak_decoder = {
510 .name = "cinepak",
511 .long_name = NULL_IF_CONFIG_SMALL("Cinepak"),
512 .type = AVMEDIA_TYPE_VIDEO,
513 .id = AV_CODEC_ID_CINEPAK,
514 .priv_data_size = sizeof(CinepakContext),
515 .init = cinepak_decode_init,
516 .close = cinepak_decode_end,
517 .decode = cinepak_decode_frame,
518 .capabilities = AV_CODEC_CAP_DR1,
519 .caps_internal = FF_CODEC_CAP_INIT_THREADSAFE,
520 };
521