?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
Remove the 3-front-channel layout from the list of channel layout
[FFMpeg-mirror/lagarith.git] / libavcodec / cinepak.c
blob5030165bd02727af1f1fe24635689eb082d6cdbe
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 libavcodec/cinepak.c
24 * Cinepak video decoder
25 * by Ewald Snel <ewald@rambo.its.tudelft.nl>
26 * For more information on the Cinepak algorithm, visit:
27 * http://www.csse.monash.edu.au/~timf/
28 * For more information on the quirky data inside Sega FILM/CPK files, visit:
29 * http://wiki.multimedia.cx/index.php?title=Sega_FILM
30 */
31
32 #include <stdio.h>
33 #include <stdlib.h>
34 #include <string.h>
35 #include <unistd.h>
36
37 #include "libavutil/intreadwrite.h"
38 #include "avcodec.h"
39
40
41 typedef struct {
42 uint8_t y0, y1, y2, y3;
43 uint8_t u, v;
44 } cvid_codebook;
45
46 #define MAX_STRIPS 32
47
48 typedef struct {
49 uint16_t id;
50 uint16_t x1, y1;
51 uint16_t x2, y2;
52 cvid_codebook v4_codebook[256];
53 cvid_codebook v1_codebook[256];
54 } cvid_strip;
55
56 typedef struct CinepakContext {
57
58 AVCodecContext *avctx;
59 AVFrame frame;
60
61 const unsigned char *data;
62 int size;
63
64 int width, height;
65
66 int palette_video;
67 cvid_strip strips[MAX_STRIPS];
68
69 int sega_film_skip_bytes;
70
71 } CinepakContext;
72
73 static void cinepak_decode_codebook (cvid_codebook *codebook,
74 int chunk_id, int size, const uint8_t *data)
75 {
76 const uint8_t *eod = (data + size);
77 uint32_t flag, mask;
78 int i, n;
79
80 /* check if this chunk contains 4- or 6-element vectors */
81 n = (chunk_id & 0x04) ? 4 : 6;
82 flag = 0;
83 mask = 0;
84
85 for (i=0; i < 256; i++) {
86 if ((chunk_id & 0x01) && !(mask >>= 1)) {
87 if ((data + 4) > eod)
88 break;
89
90 flag = AV_RB32 (data);
91 data += 4;
92 mask = 0x80000000;
93 }
94
95 if (!(chunk_id & 0x01) || (flag & mask)) {
96 if ((data + n) > eod)
97 break;
98
99 if (n == 6) {
100 codebook[i].y0 = *data++;
101 codebook[i].y1 = *data++;
102 codebook[i].y2 = *data++;
103 codebook[i].y3 = *data++;
104 codebook[i].u = 128 + *data++;
105 codebook[i].v = 128 + *data++;
106 } else {
107 /* this codebook type indicates either greyscale or
108 * palettized video; if palettized, U & V components will
109 * not be used so it is safe to set them to 128 for the
110 * benefit of greyscale rendering in YUV420P */
111 codebook[i].y0 = *data++;
112 codebook[i].y1 = *data++;
113 codebook[i].y2 = *data++;
114 codebook[i].y3 = *data++;
115 codebook[i].u = 128;
116 codebook[i].v = 128;
117 }
118 }
119 }
120 }
121
122 static int cinepak_decode_vectors (CinepakContext *s, cvid_strip *strip,
123 int chunk_id, int size, const uint8_t *data)
124 {
125 const uint8_t *eod = (data + size);
126 uint32_t flag, mask;
127 cvid_codebook *codebook;
128 unsigned int x, y;
129 uint32_t iy[4];
130 uint32_t iu[2];
131 uint32_t iv[2];
132
133 flag = 0;
134 mask = 0;
135
136 for (y=strip->y1; y < strip->y2; y+=4) {
137
138 iy[0] = strip->x1 + (y * s->frame.linesize[0]);
139 iy[1] = iy[0] + s->frame.linesize[0];
140 iy[2] = iy[1] + s->frame.linesize[0];
141 iy[3] = iy[2] + s->frame.linesize[0];
142 iu[0] = (strip->x1/2) + ((y/2) * s->frame.linesize[1]);
143 iu[1] = iu[0] + s->frame.linesize[1];
144 iv[0] = (strip->x1/2) + ((y/2) * s->frame.linesize[2]);
145 iv[1] = iv[0] + s->frame.linesize[2];
146
147 for (x=strip->x1; x < strip->x2; x+=4) {
148 if ((chunk_id & 0x01) && !(mask >>= 1)) {
149 if ((data + 4) > eod)
150 return -1;
151
152 flag = AV_RB32 (data);
153 data += 4;
154 mask = 0x80000000;
155 }
156
157 if (!(chunk_id & 0x01) || (flag & mask)) {
158 if (!(chunk_id & 0x02) && !(mask >>= 1)) {
159 if ((data + 4) > eod)
160 return -1;
161
162 flag = AV_RB32 (data);
163 data += 4;
164 mask = 0x80000000;
165 }
166
167 if ((chunk_id & 0x02) || (~flag & mask)) {
168 if (data >= eod)
169 return -1;
170
171 codebook = &strip->v1_codebook[*data++];
172 s->frame.data[0][iy[0] + 0] = codebook->y0;
173 s->frame.data[0][iy[0] + 1] = codebook->y0;
174 s->frame.data[0][iy[1] + 0] = codebook->y0;
175 s->frame.data[0][iy[1] + 1] = codebook->y0;
176 if (!s->palette_video) {
177 s->frame.data[1][iu[0]] = codebook->u;
178 s->frame.data[2][iv[0]] = codebook->v;
179 }
180
181 s->frame.data[0][iy[0] + 2] = codebook->y1;
182 s->frame.data[0][iy[0] + 3] = codebook->y1;
183 s->frame.data[0][iy[1] + 2] = codebook->y1;
184 s->frame.data[0][iy[1] + 3] = codebook->y1;
185 if (!s->palette_video) {
186 s->frame.data[1][iu[0] + 1] = codebook->u;
187 s->frame.data[2][iv[0] + 1] = codebook->v;
188 }
189
190 s->frame.data[0][iy[2] + 0] = codebook->y2;
191 s->frame.data[0][iy[2] + 1] = codebook->y2;
192 s->frame.data[0][iy[3] + 0] = codebook->y2;
193 s->frame.data[0][iy[3] + 1] = codebook->y2;
194 if (!s->palette_video) {
195 s->frame.data[1][iu[1]] = codebook->u;
196 s->frame.data[2][iv[1]] = codebook->v;
197 }
198
199 s->frame.data[0][iy[2] + 2] = codebook->y3;
200 s->frame.data[0][iy[2] + 3] = codebook->y3;
201 s->frame.data[0][iy[3] + 2] = codebook->y3;
202 s->frame.data[0][iy[3] + 3] = codebook->y3;
203 if (!s->palette_video) {
204 s->frame.data[1][iu[1] + 1] = codebook->u;
205 s->frame.data[2][iv[1] + 1] = codebook->v;
206 }
207
208 } else if (flag & mask) {
209 if ((data + 4) > eod)
210 return -1;
211
212 codebook = &strip->v4_codebook[*data++];
213 s->frame.data[0][iy[0] + 0] = codebook->y0;
214 s->frame.data[0][iy[0] + 1] = codebook->y1;
215 s->frame.data[0][iy[1] + 0] = codebook->y2;
216 s->frame.data[0][iy[1] + 1] = codebook->y3;
217 if (!s->palette_video) {
218 s->frame.data[1][iu[0]] = codebook->u;
219 s->frame.data[2][iv[0]] = codebook->v;
220 }
221
222 codebook = &strip->v4_codebook[*data++];
223 s->frame.data[0][iy[0] + 2] = codebook->y0;
224 s->frame.data[0][iy[0] + 3] = codebook->y1;
225 s->frame.data[0][iy[1] + 2] = codebook->y2;
226 s->frame.data[0][iy[1] + 3] = codebook->y3;
227 if (!s->palette_video) {
228 s->frame.data[1][iu[0] + 1] = codebook->u;
229 s->frame.data[2][iv[0] + 1] = codebook->v;
230 }
231
232 codebook = &strip->v4_codebook[*data++];
233 s->frame.data[0][iy[2] + 0] = codebook->y0;
234 s->frame.data[0][iy[2] + 1] = codebook->y1;
235 s->frame.data[0][iy[3] + 0] = codebook->y2;
236 s->frame.data[0][iy[3] + 1] = codebook->y3;
237 if (!s->palette_video) {
238 s->frame.data[1][iu[1]] = codebook->u;
239 s->frame.data[2][iv[1]] = codebook->v;
240 }
241
242 codebook = &strip->v4_codebook[*data++];
243 s->frame.data[0][iy[2] + 2] = codebook->y0;
244 s->frame.data[0][iy[2] + 3] = codebook->y1;
245 s->frame.data[0][iy[3] + 2] = codebook->y2;
246 s->frame.data[0][iy[3] + 3] = codebook->y3;
247 if (!s->palette_video) {
248 s->frame.data[1][iu[1] + 1] = codebook->u;
249 s->frame.data[2][iv[1] + 1] = codebook->v;
250 }
251
252 }
253 }
254
255 iy[0] += 4; iy[1] += 4;
256 iy[2] += 4; iy[3] += 4;
257 iu[0] += 2; iu[1] += 2;
258 iv[0] += 2; iv[1] += 2;
259 }
260 }
261
262 return 0;
263 }
264
265 static int cinepak_decode_strip (CinepakContext *s,
266 cvid_strip *strip, const uint8_t *data, int size)
267 {
268 const uint8_t *eod = (data + size);
269 int chunk_id, chunk_size;
270
271 /* coordinate sanity checks */
272 if (strip->x1 >= s->width || strip->x2 > s->width ||
273 strip->y1 >= s->height || strip->y2 > s->height ||
274 strip->x1 >= strip->x2 || strip->y1 >= strip->y2)
275 return -1;
276
277 while ((data + 4) <= eod) {
278 chunk_id = data[0];
279 chunk_size = AV_RB24 (&data[1]) - 4;
280 if(chunk_size < 0)
281 return -1;
282
283 data += 4;
284 chunk_size = ((data + chunk_size) > eod) ? (eod - data) : chunk_size;
285
286 switch (chunk_id) {
287
288 case 0x20:
289 case 0x21:
290 case 0x24:
291 case 0x25:
292 cinepak_decode_codebook (strip->v4_codebook, chunk_id,
293 chunk_size, data);
294 break;
295
296 case 0x22:
297 case 0x23:
298 case 0x26:
299 case 0x27:
300 cinepak_decode_codebook (strip->v1_codebook, chunk_id,
301 chunk_size, data);
302 break;
303
304 case 0x30:
305 case 0x31:
306 case 0x32:
307 return cinepak_decode_vectors (s, strip, chunk_id,
308 chunk_size, data);
309 }
310
311 data += chunk_size;
312 }
313
314 return -1;
315 }
316
317 static int cinepak_decode (CinepakContext *s)
318 {
319 const uint8_t *eod = (s->data + s->size);
320 int i, result, strip_size, frame_flags, num_strips;
321 int y0 = 0;
322 int encoded_buf_size;
323
324 if (s->size < 10)
325 return -1;
326
327 frame_flags = s->data[0];
328 num_strips = AV_RB16 (&s->data[8]);
329 encoded_buf_size = ((s->data[1] << 16) | AV_RB16 (&s->data[2]));
330
331 /* if this is the first frame, check for deviant Sega FILM data */
332 if (s->sega_film_skip_bytes == -1) {
333 if (encoded_buf_size != s->size) {
334 /* If the encoded frame size differs from the frame size as indicated
335 * by the container file, this data likely comes from a Sega FILM/CPK file.
336 * If the frame header is followed by the bytes FE 00 00 06 00 00 then
337 * this is probably one of the two known files that have 6 extra bytes
338 * after the frame header. Else, assume 2 extra bytes. */
339 if ((s->data[10] == 0xFE) &&
340 (s->data[11] == 0x00) &&
341 (s->data[12] == 0x00) &&
342 (s->data[13] == 0x06) &&
343 (s->data[14] == 0x00) &&
344 (s->data[15] == 0x00))
345 s->sega_film_skip_bytes = 6;
346 else
347 s->sega_film_skip_bytes = 2;
348 } else
349 s->sega_film_skip_bytes = 0;
350 }
351
352 s->data += 10 + s->sega_film_skip_bytes;
353
354 if (num_strips > MAX_STRIPS)
355 num_strips = MAX_STRIPS;
356
357 for (i=0; i < num_strips; i++) {
358 if ((s->data + 12) > eod)
359 return -1;
360
361 s->strips[i].id = s->data[0];
362 s->strips[i].y1 = y0;
363 s->strips[i].x1 = 0;
364 s->strips[i].y2 = y0 + AV_RB16 (&s->data[8]);
365 s->strips[i].x2 = s->avctx->width;
366
367 strip_size = AV_RB24 (&s->data[1]) - 12;
368 s->data += 12;
369 strip_size = ((s->data + strip_size) > eod) ? (eod - s->data) : strip_size;
370
371 if ((i > 0) && !(frame_flags & 0x01)) {
372 memcpy (s->strips[i].v4_codebook, s->strips[i-1].v4_codebook,
373 sizeof(s->strips[i].v4_codebook));
374 memcpy (s->strips[i].v1_codebook, s->strips[i-1].v1_codebook,
375 sizeof(s->strips[i].v1_codebook));
376 }
377
378 result = cinepak_decode_strip (s, &s->strips[i], s->data, strip_size);
379
380 if (result != 0)
381 return result;
382
383 s->data += strip_size;
384 y0 = s->strips[i].y2;
385 }
386 return 0;
387 }
388
389 static av_cold int cinepak_decode_init(AVCodecContext *avctx)
390 {
391 CinepakContext *s = avctx->priv_data;
392
393 s->avctx = avctx;
394 s->width = (avctx->width + 3) & ~3;
395 s->height = (avctx->height + 3) & ~3;
396 s->sega_film_skip_bytes = -1; /* uninitialized state */
397
398 // check for paletted data
399 if ((avctx->palctrl == NULL) || (avctx->bits_per_coded_sample == 40)) {
400 s->palette_video = 0;
401 avctx->pix_fmt = PIX_FMT_YUV420P;
402 } else {
403 s->palette_video = 1;
404 avctx->pix_fmt = PIX_FMT_PAL8;
405 }
406
407 s->frame.data[0] = NULL;
408
409 return 0;
410 }
411
412 static int cinepak_decode_frame(AVCodecContext *avctx,
413 void *data, int *data_size,
414 AVPacket *avpkt)
415 {
416 const uint8_t *buf = avpkt->data;
417 int buf_size = avpkt->size;
418 CinepakContext *s = avctx->priv_data;
419
420 s->data = buf;
421 s->size = buf_size;
422
423 s->frame.reference = 1;
424 s->frame.buffer_hints = FF_BUFFER_HINTS_VALID | FF_BUFFER_HINTS_PRESERVE |
425 FF_BUFFER_HINTS_REUSABLE;
426 if (avctx->reget_buffer(avctx, &s->frame)) {
427 av_log(avctx, AV_LOG_ERROR, "reget_buffer() failed\n");
428 return -1;
429 }
430
431 cinepak_decode(s);
432
433 if (s->palette_video) {
434 memcpy (s->frame.data[1], avctx->palctrl->palette, AVPALETTE_SIZE);
435 if (avctx->palctrl->palette_changed) {
436 s->frame.palette_has_changed = 1;
437 avctx->palctrl->palette_changed = 0;
438 } else
439 s->frame.palette_has_changed = 0;
440 }
441
442 *data_size = sizeof(AVFrame);
443 *(AVFrame*)data = s->frame;
444
445 /* report that the buffer was completely consumed */
446 return buf_size;
447 }
448
449 static av_cold int cinepak_decode_end(AVCodecContext *avctx)
450 {
451 CinepakContext *s = avctx->priv_data;
452
453 if (s->frame.data[0])
454 avctx->release_buffer(avctx, &s->frame);
455
456 return 0;
457 }
458
459 AVCodec cinepak_decoder = {
460 "cinepak",
461 CODEC_TYPE_VIDEO,
462 CODEC_ID_CINEPAK,
463 sizeof(CinepakContext),
464 cinepak_decode_init,
465 NULL,
466 cinepak_decode_end,
467 cinepak_decode_frame,
468 CODEC_CAP_DR1,
469 .long_name = NULL_IF_CONFIG_SMALL("Cinepak"),
470 };
ffmpeg Lagarith lossless decoder