Imported Debian version 2.5.3~trusty1
[deb_ffmpeg.git] / ffmpeg / libavcodec / vqavideo.c
1 /*
2 * Westwood Studios VQA 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 * VQA Video Decoder
25 * @author Mike Melanson (melanson@pcisys.net)
26 * @see http://wiki.multimedia.cx/index.php?title=VQA
27 *
28 * The VQA video decoder outputs PAL8 or RGB555 colorspace data, depending
29 * on the type of data in the file.
30 *
31 * This decoder needs the 42-byte VQHD header from the beginning
32 * of the VQA file passed through the extradata field. The VQHD header
33 * is laid out as:
34 *
35 * bytes 0-3 chunk fourcc: 'VQHD'
36 * bytes 4-7 chunk size in big-endian format, should be 0x0000002A
37 * bytes 8-49 VQHD chunk data
38 *
39 * Bytes 8-49 are what this decoder expects to see.
40 *
41 * Briefly, VQA is a vector quantized animation format that operates in a
42 * VGA palettized colorspace. It operates on pixel vectors (blocks)
43 * of either 4x2 or 4x4 in size. Compressed VQA chunks can contain vector
44 * codebooks, palette information, and code maps for rendering vectors onto
45 * frames. Any of these components can also be compressed with a run-length
46 * encoding (RLE) algorithm commonly referred to as "format80".
47 *
48 * VQA takes a novel approach to rate control. Each group of n frames
49 * (usually, n = 8) relies on a different vector codebook. Rather than
50 * transporting an entire codebook every 8th frame, the new codebook is
51 * broken up into 8 pieces and sent along with the compressed video chunks
52 * for each of the 8 frames preceding the 8 frames which require the
53 * codebook. A full codebook is also sent on the very first frame of a
54 * file. This is an interesting technique, although it makes random file
55 * seeking difficult despite the fact that the frames are all intracoded.
56 *
57 * V1,2 VQA uses 12-bit codebook indexes. If the 12-bit indexes were
58 * packed into bytes and then RLE compressed, bytewise, the results would
59 * be poor. That is why the coding method divides each index into 2 parts,
60 * the top 4 bits and the bottom 8 bits, then RL encodes the 4-bit pieces
61 * together and the 8-bit pieces together. If most of the vectors are
62 * clustered into one group of 256 vectors, most of the 4-bit index pieces
63 * should be the same.
64 */
65
66 #include <stdio.h>
67 #include <stdlib.h>
68 #include <string.h>
69
70 #include "libavutil/intreadwrite.h"
71 #include "libavutil/imgutils.h"
72 #include "avcodec.h"
73 #include "bytestream.h"
74 #include "internal.h"
75
76 #define PALETTE_COUNT 256
77 #define VQA_HEADER_SIZE 0x2A
78
79 /* allocate the maximum vector space, regardless of the file version:
80 * (0xFF00 codebook vectors + 0x100 solid pixel vectors) * (4x4 pixels/block) */
81 #define MAX_CODEBOOK_VECTORS 0xFF00
82 #define SOLID_PIXEL_VECTORS 0x100
83 #define MAX_VECTORS (MAX_CODEBOOK_VECTORS + SOLID_PIXEL_VECTORS)
84 #define MAX_CODEBOOK_SIZE (MAX_VECTORS * 4 * 4)
85
86 #define CBF0_TAG MKBETAG('C', 'B', 'F', '0')
87 #define CBFZ_TAG MKBETAG('C', 'B', 'F', 'Z')
88 #define CBP0_TAG MKBETAG('C', 'B', 'P', '0')
89 #define CBPZ_TAG MKBETAG('C', 'B', 'P', 'Z')
90 #define CPL0_TAG MKBETAG('C', 'P', 'L', '0')
91 #define CPLZ_TAG MKBETAG('C', 'P', 'L', 'Z')
92 #define VPTZ_TAG MKBETAG('V', 'P', 'T', 'Z')
93
94 typedef struct VqaContext {
95
96 AVCodecContext *avctx;
97 GetByteContext gb;
98
99 uint32_t palette[PALETTE_COUNT];
100
101 int width; /* width of a frame */
102 int height; /* height of a frame */
103 int vector_width; /* width of individual vector */
104 int vector_height; /* height of individual vector */
105 int vqa_version; /* this should be either 1, 2 or 3 */
106
107 unsigned char *codebook; /* the current codebook */
108 int codebook_size;
109 unsigned char *next_codebook_buffer; /* accumulator for next codebook */
110 int next_codebook_buffer_index;
111
112 unsigned char *decode_buffer;
113 int decode_buffer_size;
114
115 /* number of frames to go before replacing codebook */
116 int partial_countdown;
117 int partial_count;
118
119 } VqaContext;
120
121 static av_cold int vqa_decode_init(AVCodecContext *avctx)
122 {
123 VqaContext *s = avctx->priv_data;
124 int i, j, codebook_index, ret;
125
126 s->avctx = avctx;
127 avctx->pix_fmt = AV_PIX_FMT_PAL8;
128
129 /* make sure the extradata made it */
130 if (s->avctx->extradata_size != VQA_HEADER_SIZE) {
131 av_log(s->avctx, AV_LOG_ERROR, "expected extradata size of %d\n", VQA_HEADER_SIZE);
132 return AVERROR(EINVAL);
133 }
134
135 /* load up the VQA parameters from the header */
136 s->vqa_version = s->avctx->extradata[0];
137 switch (s->vqa_version) {
138 case 1:
139 case 2:
140 break;
141 case 3:
142 avpriv_report_missing_feature(avctx, "VQA Version %d", s->vqa_version);
143 return AVERROR_PATCHWELCOME;
144 default:
145 avpriv_request_sample(avctx, "VQA Version %i", s->vqa_version);
146 return AVERROR_PATCHWELCOME;
147 }
148 s->width = AV_RL16(&s->avctx->extradata[6]);
149 s->height = AV_RL16(&s->avctx->extradata[8]);
150 if ((ret = av_image_check_size(s->width, s->height, 0, avctx)) < 0) {
151 s->width= s->height= 0;
152 return ret;
153 }
154 s->vector_width = s->avctx->extradata[10];
155 s->vector_height = s->avctx->extradata[11];
156 s->partial_count = s->partial_countdown = s->avctx->extradata[13];
157
158 /* the vector dimensions have to meet very stringent requirements */
159 if ((s->vector_width != 4) ||
160 ((s->vector_height != 2) && (s->vector_height != 4))) {
161 /* return without further initialization */
162 return AVERROR_INVALIDDATA;
163 }
164
165 if (s->width % s->vector_width || s->height % s->vector_height) {
166 av_log(avctx, AV_LOG_ERROR, "Image size not multiple of block size\n");
167 return AVERROR_INVALIDDATA;
168 }
169
170 /* allocate codebooks */
171 s->codebook_size = MAX_CODEBOOK_SIZE;
172 s->codebook = av_malloc(s->codebook_size);
173 if (!s->codebook)
174 goto fail;
175 s->next_codebook_buffer = av_malloc(s->codebook_size);
176 if (!s->next_codebook_buffer)
177 goto fail;
178
179 /* allocate decode buffer */
180 s->decode_buffer_size = (s->width / s->vector_width) *
181 (s->height / s->vector_height) * 2;
182 s->decode_buffer = av_mallocz(s->decode_buffer_size);
183 if (!s->decode_buffer)
184 goto fail;
185
186 /* initialize the solid-color vectors */
187 if (s->vector_height == 4) {
188 codebook_index = 0xFF00 * 16;
189 for (i = 0; i < 256; i++)
190 for (j = 0; j < 16; j++)
191 s->codebook[codebook_index++] = i;
192 } else {
193 codebook_index = 0xF00 * 8;
194 for (i = 0; i < 256; i++)
195 for (j = 0; j < 8; j++)
196 s->codebook[codebook_index++] = i;
197 }
198 s->next_codebook_buffer_index = 0;
199
200 return 0;
201 fail:
202 av_freep(&s->codebook);
203 av_freep(&s->next_codebook_buffer);
204 av_freep(&s->decode_buffer);
205 return AVERROR(ENOMEM);
206 }
207
208 #define CHECK_COUNT() \
209 if (dest_index + count > dest_size) { \
210 av_log(s->avctx, AV_LOG_ERROR, "decode_format80 problem: next op would overflow dest_index\n"); \
211 av_log(s->avctx, AV_LOG_ERROR, "current dest_index = %d, count = %d, dest_size = %d\n", \
212 dest_index, count, dest_size); \
213 return AVERROR_INVALIDDATA; \
214 }
215
216 #define CHECK_COPY(idx) \
217 if (idx < 0 || idx + count > dest_size) { \
218 av_log(s->avctx, AV_LOG_ERROR, "decode_format80 problem: next op would overflow dest_index\n"); \
219 av_log(s->avctx, AV_LOG_ERROR, "current src_pos = %d, count = %d, dest_size = %d\n", \
220 src_pos, count, dest_size); \
221 return AVERROR_INVALIDDATA; \
222 }
223
224
225 static int decode_format80(VqaContext *s, int src_size,
226 unsigned char *dest, int dest_size, int check_size) {
227
228 int dest_index = 0;
229 int count, opcode, start;
230 int src_pos;
231 unsigned char color;
232 int i;
233
234 start = bytestream2_tell(&s->gb);
235 while (bytestream2_tell(&s->gb) - start < src_size) {
236 opcode = bytestream2_get_byte(&s->gb);
237 av_dlog(s->avctx, "opcode %02X: ", opcode);
238
239 /* 0x80 means that frame is finished */
240 if (opcode == 0x80)
241 break;
242
243 if (dest_index >= dest_size) {
244 av_log(s->avctx, AV_LOG_ERROR, "decode_format80 problem: dest_index (%d) exceeded dest_size (%d)\n",
245 dest_index, dest_size);
246 return AVERROR_INVALIDDATA;
247 }
248
249 if (opcode == 0xFF) {
250
251 count = bytestream2_get_le16(&s->gb);
252 src_pos = bytestream2_get_le16(&s->gb);
253 av_dlog(s->avctx, "(1) copy %X bytes from absolute pos %X\n", count, src_pos);
254 CHECK_COUNT();
255 CHECK_COPY(src_pos);
256 for (i = 0; i < count; i++)
257 dest[dest_index + i] = dest[src_pos + i];
258 dest_index += count;
259
260 } else if (opcode == 0xFE) {
261
262 count = bytestream2_get_le16(&s->gb);
263 color = bytestream2_get_byte(&s->gb);
264 av_dlog(s->avctx, "(2) set %X bytes to %02X\n", count, color);
265 CHECK_COUNT();
266 memset(&dest[dest_index], color, count);
267 dest_index += count;
268
269 } else if ((opcode & 0xC0) == 0xC0) {
270
271 count = (opcode & 0x3F) + 3;
272 src_pos = bytestream2_get_le16(&s->gb);
273 av_dlog(s->avctx, "(3) copy %X bytes from absolute pos %X\n", count, src_pos);
274 CHECK_COUNT();
275 CHECK_COPY(src_pos);
276 for (i = 0; i < count; i++)
277 dest[dest_index + i] = dest[src_pos + i];
278 dest_index += count;
279
280 } else if (opcode > 0x80) {
281
282 count = opcode & 0x3F;
283 av_dlog(s->avctx, "(4) copy %X bytes from source to dest\n", count);
284 CHECK_COUNT();
285 bytestream2_get_buffer(&s->gb, &dest[dest_index], count);
286 dest_index += count;
287
288 } else {
289
290 count = ((opcode & 0x70) >> 4) + 3;
291 src_pos = bytestream2_get_byte(&s->gb) | ((opcode & 0x0F) << 8);
292 av_dlog(s->avctx, "(5) copy %X bytes from relpos %X\n", count, src_pos);
293 CHECK_COUNT();
294 CHECK_COPY(dest_index - src_pos);
295 for (i = 0; i < count; i++)
296 dest[dest_index + i] = dest[dest_index - src_pos + i];
297 dest_index += count;
298 }
299 }
300
301 /* validate that the entire destination buffer was filled; this is
302 * important for decoding frame maps since each vector needs to have a
303 * codebook entry; it is not important for compressed codebooks because
304 * not every entry needs to be filled */
305 if (check_size)
306 if (dest_index < dest_size) {
307 av_log(s->avctx, AV_LOG_ERROR, "decode_format80 problem: decode finished with dest_index (%d) < dest_size (%d)\n",
308 dest_index, dest_size);
309 memset(dest + dest_index, 0, dest_size - dest_index);
310 }
311
312 return 0; // let's display what we decoded anyway
313 }
314
315 static int vqa_decode_chunk(VqaContext *s, AVFrame *frame)
316 {
317 unsigned int chunk_type;
318 unsigned int chunk_size;
319 int byte_skip;
320 unsigned int index = 0;
321 int i;
322 unsigned char r, g, b;
323 int index_shift;
324 int res;
325
326 int cbf0_chunk = -1;
327 int cbfz_chunk = -1;
328 int cbp0_chunk = -1;
329 int cbpz_chunk = -1;
330 int cpl0_chunk = -1;
331 int cplz_chunk = -1;
332 int vptz_chunk = -1;
333
334 int x, y;
335 int lines = 0;
336 int pixel_ptr;
337 int vector_index = 0;
338 int lobyte = 0;
339 int hibyte = 0;
340 int lobytes = 0;
341 int hibytes = s->decode_buffer_size / 2;
342
343 /* first, traverse through the frame and find the subchunks */
344 while (bytestream2_get_bytes_left(&s->gb) >= 8) {
345
346 chunk_type = bytestream2_get_be32u(&s->gb);
347 index = bytestream2_tell(&s->gb);
348 chunk_size = bytestream2_get_be32u(&s->gb);
349
350 switch (chunk_type) {
351
352 case CBF0_TAG:
353 cbf0_chunk = index;
354 break;
355
356 case CBFZ_TAG:
357 cbfz_chunk = index;
358 break;
359
360 case CBP0_TAG:
361 cbp0_chunk = index;
362 break;
363
364 case CBPZ_TAG:
365 cbpz_chunk = index;
366 break;
367
368 case CPL0_TAG:
369 cpl0_chunk = index;
370 break;
371
372 case CPLZ_TAG:
373 cplz_chunk = index;
374 break;
375
376 case VPTZ_TAG:
377 vptz_chunk = index;
378 break;
379
380 default:
381 av_log(s->avctx, AV_LOG_ERROR, "Found unknown chunk type: %c%c%c%c (%08X)\n",
382 (chunk_type >> 24) & 0xFF,
383 (chunk_type >> 16) & 0xFF,
384 (chunk_type >> 8) & 0xFF,
385 (chunk_type >> 0) & 0xFF,
386 chunk_type);
387 break;
388 }
389
390 byte_skip = chunk_size & 0x01;
391 bytestream2_skip(&s->gb, chunk_size + byte_skip);
392 }
393
394 /* next, deal with the palette */
395 if ((cpl0_chunk != -1) && (cplz_chunk != -1)) {
396
397 /* a chunk should not have both chunk types */
398 av_log(s->avctx, AV_LOG_ERROR, "problem: found both CPL0 and CPLZ chunks\n");
399 return AVERROR_INVALIDDATA;
400 }
401
402 /* decompress the palette chunk */
403 if (cplz_chunk != -1) {
404
405 /* yet to be handled */
406
407 }
408
409 /* convert the RGB palette into the machine's endian format */
410 if (cpl0_chunk != -1) {
411
412 bytestream2_seek(&s->gb, cpl0_chunk, SEEK_SET);
413 chunk_size = bytestream2_get_be32(&s->gb);
414 /* sanity check the palette size */
415 if (chunk_size / 3 > 256 || chunk_size > bytestream2_get_bytes_left(&s->gb)) {
416 av_log(s->avctx, AV_LOG_ERROR, "problem: found a palette chunk with %d colors\n",
417 chunk_size / 3);
418 return AVERROR_INVALIDDATA;
419 }
420 for (i = 0; i < chunk_size / 3; i++) {
421 /* scale by 4 to transform 6-bit palette -> 8-bit */
422 r = bytestream2_get_byteu(&s->gb) * 4;
423 g = bytestream2_get_byteu(&s->gb) * 4;
424 b = bytestream2_get_byteu(&s->gb) * 4;
425 s->palette[i] = 0xFFU << 24 | r << 16 | g << 8 | b;
426 s->palette[i] |= s->palette[i] >> 6 & 0x30303;
427 }
428 }
429
430 /* next, look for a full codebook */
431 if ((cbf0_chunk != -1) && (cbfz_chunk != -1)) {
432
433 /* a chunk should not have both chunk types */
434 av_log(s->avctx, AV_LOG_ERROR, "problem: found both CBF0 and CBFZ chunks\n");
435 return AVERROR_INVALIDDATA;
436 }
437
438 /* decompress the full codebook chunk */
439 if (cbfz_chunk != -1) {
440
441 bytestream2_seek(&s->gb, cbfz_chunk, SEEK_SET);
442 chunk_size = bytestream2_get_be32(&s->gb);
443 if ((res = decode_format80(s, chunk_size, s->codebook,
444 s->codebook_size, 0)) < 0)
445 return res;
446 }
447
448 /* copy a full codebook */
449 if (cbf0_chunk != -1) {
450
451 bytestream2_seek(&s->gb, cbf0_chunk, SEEK_SET);
452 chunk_size = bytestream2_get_be32(&s->gb);
453 /* sanity check the full codebook size */
454 if (chunk_size > MAX_CODEBOOK_SIZE) {
455 av_log(s->avctx, AV_LOG_ERROR, "problem: CBF0 chunk too large (0x%X bytes)\n",
456 chunk_size);
457 return AVERROR_INVALIDDATA;
458 }
459
460 bytestream2_get_buffer(&s->gb, s->codebook, chunk_size);
461 }
462
463 /* decode the frame */
464 if (vptz_chunk == -1) {
465
466 /* something is wrong if there is no VPTZ chunk */
467 av_log(s->avctx, AV_LOG_ERROR, "problem: no VPTZ chunk found\n");
468 return AVERROR_INVALIDDATA;
469 }
470
471 bytestream2_seek(&s->gb, vptz_chunk, SEEK_SET);
472 chunk_size = bytestream2_get_be32(&s->gb);
473 if ((res = decode_format80(s, chunk_size,
474 s->decode_buffer, s->decode_buffer_size, 1)) < 0)
475 return res;
476
477 /* render the final PAL8 frame */
478 if (s->vector_height == 4)
479 index_shift = 4;
480 else
481 index_shift = 3;
482 for (y = 0; y < s->height; y += s->vector_height) {
483 for (x = 0; x < s->width; x += 4, lobytes++, hibytes++) {
484 pixel_ptr = y * frame->linesize[0] + x;
485
486 /* get the vector index, the method for which varies according to
487 * VQA file version */
488 switch (s->vqa_version) {
489
490 case 1:
491 lobyte = s->decode_buffer[lobytes * 2];
492 hibyte = s->decode_buffer[(lobytes * 2) + 1];
493 vector_index = ((hibyte << 8) | lobyte) >> 3;
494 vector_index <<= index_shift;
495 lines = s->vector_height;
496 /* uniform color fill - a quick hack */
497 if (hibyte == 0xFF) {
498 while (lines--) {
499 frame->data[0][pixel_ptr + 0] = 255 - lobyte;
500 frame->data[0][pixel_ptr + 1] = 255 - lobyte;
501 frame->data[0][pixel_ptr + 2] = 255 - lobyte;
502 frame->data[0][pixel_ptr + 3] = 255 - lobyte;
503 pixel_ptr += frame->linesize[0];
504 }
505 lines=0;
506 }
507 break;
508
509 case 2:
510 lobyte = s->decode_buffer[lobytes];
511 hibyte = s->decode_buffer[hibytes];
512 vector_index = (hibyte << 8) | lobyte;
513 vector_index <<= index_shift;
514 lines = s->vector_height;
515 break;
516
517 case 3:
518 /* not implemented yet */
519 lines = 0;
520 break;
521 }
522
523 while (lines--) {
524 frame->data[0][pixel_ptr + 0] = s->codebook[vector_index++];
525 frame->data[0][pixel_ptr + 1] = s->codebook[vector_index++];
526 frame->data[0][pixel_ptr + 2] = s->codebook[vector_index++];
527 frame->data[0][pixel_ptr + 3] = s->codebook[vector_index++];
528 pixel_ptr += frame->linesize[0];
529 }
530 }
531 }
532
533 /* handle partial codebook */
534 if ((cbp0_chunk != -1) && (cbpz_chunk != -1)) {
535 /* a chunk should not have both chunk types */
536 av_log(s->avctx, AV_LOG_ERROR, "problem: found both CBP0 and CBPZ chunks\n");
537 return AVERROR_INVALIDDATA;
538 }
539
540 if (cbp0_chunk != -1) {
541
542 bytestream2_seek(&s->gb, cbp0_chunk, SEEK_SET);
543 chunk_size = bytestream2_get_be32(&s->gb);
544
545 if (chunk_size > MAX_CODEBOOK_SIZE - s->next_codebook_buffer_index) {
546 av_log(s->avctx, AV_LOG_ERROR, "cbp0 chunk too large (%u bytes)\n",
547 chunk_size);
548 return AVERROR_INVALIDDATA;
549 }
550
551 /* accumulate partial codebook */
552 bytestream2_get_buffer(&s->gb, &s->next_codebook_buffer[s->next_codebook_buffer_index],
553 chunk_size);
554 s->next_codebook_buffer_index += chunk_size;
555
556 s->partial_countdown--;
557 if (s->partial_countdown <= 0) {
558
559 /* time to replace codebook */
560 memcpy(s->codebook, s->next_codebook_buffer,
561 s->next_codebook_buffer_index);
562
563 /* reset accounting */
564 s->next_codebook_buffer_index = 0;
565 s->partial_countdown = s->partial_count;
566 }
567 }
568
569 if (cbpz_chunk != -1) {
570
571 bytestream2_seek(&s->gb, cbpz_chunk, SEEK_SET);
572 chunk_size = bytestream2_get_be32(&s->gb);
573
574 if (chunk_size > MAX_CODEBOOK_SIZE - s->next_codebook_buffer_index) {
575 av_log(s->avctx, AV_LOG_ERROR, "cbpz chunk too large (%u bytes)\n",
576 chunk_size);
577 return AVERROR_INVALIDDATA;
578 }
579
580 /* accumulate partial codebook */
581 bytestream2_get_buffer(&s->gb, &s->next_codebook_buffer[s->next_codebook_buffer_index],
582 chunk_size);
583 s->next_codebook_buffer_index += chunk_size;
584
585 s->partial_countdown--;
586 if (s->partial_countdown <= 0) {
587 bytestream2_init(&s->gb, s->next_codebook_buffer, s->next_codebook_buffer_index);
588 /* decompress codebook */
589 if ((res = decode_format80(s, s->next_codebook_buffer_index,
590 s->codebook, s->codebook_size, 0)) < 0)
591 return res;
592
593 /* reset accounting */
594 s->next_codebook_buffer_index = 0;
595 s->partial_countdown = s->partial_count;
596 }
597 }
598
599 return 0;
600 }
601
602 static int vqa_decode_frame(AVCodecContext *avctx,
603 void *data, int *got_frame,
604 AVPacket *avpkt)
605 {
606 VqaContext *s = avctx->priv_data;
607 AVFrame *frame = data;
608 int res;
609
610 if ((res = ff_get_buffer(avctx, frame, 0)) < 0)
611 return res;
612
613 bytestream2_init(&s->gb, avpkt->data, avpkt->size);
614 if ((res = vqa_decode_chunk(s, frame)) < 0)
615 return res;
616
617 /* make the palette available on the way out */
618 memcpy(frame->data[1], s->palette, PALETTE_COUNT * 4);
619 frame->palette_has_changed = 1;
620
621 *got_frame = 1;
622
623 /* report that the buffer was completely consumed */
624 return avpkt->size;
625 }
626
627 static av_cold int vqa_decode_end(AVCodecContext *avctx)
628 {
629 VqaContext *s = avctx->priv_data;
630
631 av_freep(&s->codebook);
632 av_freep(&s->next_codebook_buffer);
633 av_freep(&s->decode_buffer);
634
635 return 0;
636 }
637
638 AVCodec ff_vqa_decoder = {
639 .name = "vqavideo",
640 .long_name = NULL_IF_CONFIG_SMALL("Westwood Studios VQA (Vector Quantized Animation) video"),
641 .type = AVMEDIA_TYPE_VIDEO,
642 .id = AV_CODEC_ID_WS_VQA,
643 .priv_data_size = sizeof(VqaContext),
644 .init = vqa_decode_init,
645 .close = vqa_decode_end,
646 .decode = vqa_decode_frame,
647 .capabilities = CODEC_CAP_DR1,
648 };