path: root/libavcodec/vqavideo.c (plain)
blob: 0e70be1000a1f45a1b84671966bffb3ca6c53f83

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	if (src_size < 0 || src_size > bytestream2_get_bytes_left(&s->gb)) {
235	av_log(s->avctx, AV_LOG_ERROR, "Chunk size %d is out of range\n",
236	src_size);
237	return AVERROR_INVALIDDATA;
238	}
239
240	start = bytestream2_tell(&s->gb);
241	while (bytestream2_tell(&s->gb) - start < src_size) {
242	opcode = bytestream2_get_byte(&s->gb);
243	ff_tlog(s->avctx, "opcode %02X: ", opcode);
244
245	/* 0x80 means that frame is finished */
246	if (opcode == 0x80)
247	break;
248
249	if (dest_index >= dest_size) {
250	av_log(s->avctx, AV_LOG_ERROR, "decode_format80 problem: dest_index (%d) exceeded dest_size (%d)\n",
251	dest_index, dest_size);
252	return AVERROR_INVALIDDATA;
253	}
254
255	if (opcode == 0xFF) {
256
257	count = bytestream2_get_le16(&s->gb);
258	src_pos = bytestream2_get_le16(&s->gb);
259	ff_tlog(s->avctx, "(1) copy %X bytes from absolute pos %X\n", count, src_pos);
260	CHECK_COUNT();
261	CHECK_COPY(src_pos);
262	for (i = 0; i < count; i++)
263	dest[dest_index + i] = dest[src_pos + i];
264	dest_index += count;
265
266	} else if (opcode == 0xFE) {
267
268	count = bytestream2_get_le16(&s->gb);
269	color = bytestream2_get_byte(&s->gb);
270	ff_tlog(s->avctx, "(2) set %X bytes to %02X\n", count, color);
271	CHECK_COUNT();
272	memset(&dest[dest_index], color, count);
273	dest_index += count;
274
275	} else if ((opcode & 0xC0) == 0xC0) {
276
277	count = (opcode & 0x3F) + 3;
278	src_pos = bytestream2_get_le16(&s->gb);
279	ff_tlog(s->avctx, "(3) copy %X bytes from absolute pos %X\n", count, src_pos);
280	CHECK_COUNT();
281	CHECK_COPY(src_pos);
282	for (i = 0; i < count; i++)
283	dest[dest_index + i] = dest[src_pos + i];
284	dest_index += count;
285
286	} else if (opcode > 0x80) {
287
288	count = opcode & 0x3F;
289	ff_tlog(s->avctx, "(4) copy %X bytes from source to dest\n", count);
290	CHECK_COUNT();
291	bytestream2_get_buffer(&s->gb, &dest[dest_index], count);
292	dest_index += count;
293
294	} else {
295
296	count = ((opcode & 0x70) >> 4) + 3;
297	src_pos = bytestream2_get_byte(&s->gb) | ((opcode & 0x0F) << 8);
298	ff_tlog(s->avctx, "(5) copy %X bytes from relpos %X\n", count, src_pos);
299	CHECK_COUNT();
300	CHECK_COPY(dest_index - src_pos);
301	for (i = 0; i < count; i++)
302	dest[dest_index + i] = dest[dest_index - src_pos + i];
303	dest_index += count;
304	}
305	}
306
307	/* validate that the entire destination buffer was filled; this is
308	* important for decoding frame maps since each vector needs to have a
309	* codebook entry; it is not important for compressed codebooks because
310	* not every entry needs to be filled */
311	if (check_size)
312	if (dest_index < dest_size) {
313	av_log(s->avctx, AV_LOG_ERROR, "decode_format80 problem: decode finished with dest_index (%d) < dest_size (%d)\n",
314	dest_index, dest_size);
315	memset(dest + dest_index, 0, dest_size - dest_index);
316	}
317
318	return 0; // let's display what we decoded anyway
319	}
320
321	static int vqa_decode_chunk(VqaContext *s, AVFrame *frame)
322	{
323	unsigned int chunk_type;
324	unsigned int chunk_size;
325	int byte_skip;
326	unsigned int index = 0;
327	int i;
328	unsigned char r, g, b;
329	int index_shift;
330	int res;
331
332	int cbf0_chunk = -1;
333	int cbfz_chunk = -1;
334	int cbp0_chunk = -1;
335	int cbpz_chunk = -1;
336	int cpl0_chunk = -1;
337	int cplz_chunk = -1;
338	int vptz_chunk = -1;
339
340	int x, y;
341	int lines = 0;
342	int pixel_ptr;
343	int vector_index = 0;
344	int lobyte = 0;
345	int hibyte = 0;
346	int lobytes = 0;
347	int hibytes = s->decode_buffer_size / 2;
348
349	/* first, traverse through the frame and find the subchunks */
350	while (bytestream2_get_bytes_left(&s->gb) >= 8) {
351
352	chunk_type = bytestream2_get_be32u(&s->gb);
353	index = bytestream2_tell(&s->gb);
354	chunk_size = bytestream2_get_be32u(&s->gb);
355
356	switch (chunk_type) {
357
358	case CBF0_TAG:
359	cbf0_chunk = index;
360	break;
361
362	case CBFZ_TAG:
363	cbfz_chunk = index;
364	break;
365
366	case CBP0_TAG:
367	cbp0_chunk = index;
368	break;
369
370	case CBPZ_TAG:
371	cbpz_chunk = index;
372	break;
373
374	case CPL0_TAG:
375	cpl0_chunk = index;
376	break;
377
378	case CPLZ_TAG:
379	cplz_chunk = index;
380	break;
381
382	case VPTZ_TAG:
383	vptz_chunk = index;
384	break;
385
386	default:
387	av_log(s->avctx, AV_LOG_ERROR, "Found unknown chunk type: %s (%08X)\n",
388	av_fourcc2str(av_bswap32(chunk_type)), chunk_type);
389	break;
390	}
391
392	byte_skip = chunk_size & 0x01;
393	bytestream2_skip(&s->gb, chunk_size + byte_skip);
394	}
395
396	/* next, deal with the palette */
397	if ((cpl0_chunk != -1) && (cplz_chunk != -1)) {
398
399	/* a chunk should not have both chunk types */
400	av_log(s->avctx, AV_LOG_ERROR, "problem: found both CPL0 and CPLZ chunks\n");
401	return AVERROR_INVALIDDATA;
402	}
403
404	/* decompress the palette chunk */
405	if (cplz_chunk != -1) {
406
407	/* yet to be handled */
408
409	}
410
411	/* convert the RGB palette into the machine's endian format */
412	if (cpl0_chunk != -1) {
413
414	bytestream2_seek(&s->gb, cpl0_chunk, SEEK_SET);
415	chunk_size = bytestream2_get_be32(&s->gb);
416	/* sanity check the palette size */
417	if (chunk_size / 3 > 256 || chunk_size > bytestream2_get_bytes_left(&s->gb)) {
418	av_log(s->avctx, AV_LOG_ERROR, "problem: found a palette chunk with %d colors\n",
419	chunk_size / 3);
420	return AVERROR_INVALIDDATA;
421	}
422	for (i = 0; i < chunk_size / 3; i++) {
423	/* scale by 4 to transform 6-bit palette -> 8-bit */
424	r = bytestream2_get_byteu(&s->gb) * 4;
425	g = bytestream2_get_byteu(&s->gb) * 4;
426	b = bytestream2_get_byteu(&s->gb) * 4;
427	s->palette[i] = 0xFFU << 24 | r << 16 | g << 8 | b;
428	s->palette[i] |= s->palette[i] >> 6 & 0x30303;
429	}
430	}
431
432	/* next, look for a full codebook */
433	if ((cbf0_chunk != -1) && (cbfz_chunk != -1)) {
434
435	/* a chunk should not have both chunk types */
436	av_log(s->avctx, AV_LOG_ERROR, "problem: found both CBF0 and CBFZ chunks\n");
437	return AVERROR_INVALIDDATA;
438	}
439
440	/* decompress the full codebook chunk */
441	if (cbfz_chunk != -1) {
442
443	bytestream2_seek(&s->gb, cbfz_chunk, SEEK_SET);
444	chunk_size = bytestream2_get_be32(&s->gb);
445	if ((res = decode_format80(s, chunk_size, s->codebook,
446	s->codebook_size, 0)) < 0)
447	return res;
448	}
449
450	/* copy a full codebook */
451	if (cbf0_chunk != -1) {
452
453	bytestream2_seek(&s->gb, cbf0_chunk, SEEK_SET);
454	chunk_size = bytestream2_get_be32(&s->gb);
455	/* sanity check the full codebook size */
456	if (chunk_size > MAX_CODEBOOK_SIZE) {
457	av_log(s->avctx, AV_LOG_ERROR, "problem: CBF0 chunk too large (0x%X bytes)\n",
458	chunk_size);
459	return AVERROR_INVALIDDATA;
460	}
461
462	bytestream2_get_buffer(&s->gb, s->codebook, chunk_size);
463	}
464
465	/* decode the frame */
466	if (vptz_chunk == -1) {
467
468	/* something is wrong if there is no VPTZ chunk */
469	av_log(s->avctx, AV_LOG_ERROR, "problem: no VPTZ chunk found\n");
470	return AVERROR_INVALIDDATA;
471	}
472
473	bytestream2_seek(&s->gb, vptz_chunk, SEEK_SET);
474	chunk_size = bytestream2_get_be32(&s->gb);
475	if ((res = decode_format80(s, chunk_size,
476	s->decode_buffer, s->decode_buffer_size, 1)) < 0)
477	return res;
478
479	/* render the final PAL8 frame */
480	if (s->vector_height == 4)
481	index_shift = 4;
482	else
483	index_shift = 3;
484	for (y = 0; y < s->height; y += s->vector_height) {
485	for (x = 0; x < s->width; x += 4, lobytes++, hibytes++) {
486	pixel_ptr = y * frame->linesize[0] + x;
487
488	/* get the vector index, the method for which varies according to
489	* VQA file version */
490	switch (s->vqa_version) {
491
492	case 1:
493	lobyte = s->decode_buffer[lobytes * 2];
494	hibyte = s->decode_buffer[(lobytes * 2) + 1];
495	vector_index = ((hibyte << 8) | lobyte) >> 3;
496	vector_index <<= index_shift;
497	lines = s->vector_height;
498	/* uniform color fill - a quick hack */
499	if (hibyte == 0xFF) {
500	while (lines--) {
501	frame->data[0][pixel_ptr + 0] = 255 - lobyte;
502	frame->data[0][pixel_ptr + 1] = 255 - lobyte;
503	frame->data[0][pixel_ptr + 2] = 255 - lobyte;
504	frame->data[0][pixel_ptr + 3] = 255 - lobyte;
505	pixel_ptr += frame->linesize[0];
506	}
507	lines=0;
508	}
509	break;
510
511	case 2:
512	lobyte = s->decode_buffer[lobytes];
513	hibyte = s->decode_buffer[hibytes];
514	vector_index = (hibyte << 8) | lobyte;
515	vector_index <<= index_shift;
516	lines = s->vector_height;
517	break;
518
519	case 3:
520	/* not implemented yet */
521	lines = 0;
522	break;
523	}
524
525	while (lines--) {
526	frame->data[0][pixel_ptr + 0] = s->codebook[vector_index++];
527	frame->data[0][pixel_ptr + 1] = s->codebook[vector_index++];
528	frame->data[0][pixel_ptr + 2] = s->codebook[vector_index++];
529	frame->data[0][pixel_ptr + 3] = s->codebook[vector_index++];
530	pixel_ptr += frame->linesize[0];
531	}
532	}
533	}
534
535	/* handle partial codebook */
536	if ((cbp0_chunk != -1) && (cbpz_chunk != -1)) {
537	/* a chunk should not have both chunk types */
538	av_log(s->avctx, AV_LOG_ERROR, "problem: found both CBP0 and CBPZ chunks\n");
539	return AVERROR_INVALIDDATA;
540	}
541
542	if (cbp0_chunk != -1) {
543
544	bytestream2_seek(&s->gb, cbp0_chunk, SEEK_SET);
545	chunk_size = bytestream2_get_be32(&s->gb);
546
547	if (chunk_size > MAX_CODEBOOK_SIZE - s->next_codebook_buffer_index) {
548	av_log(s->avctx, AV_LOG_ERROR, "cbp0 chunk too large (%u bytes)\n",
549	chunk_size);
550	return AVERROR_INVALIDDATA;
551	}
552
553	/* accumulate partial codebook */
554	bytestream2_get_buffer(&s->gb, &s->next_codebook_buffer[s->next_codebook_buffer_index],
555	chunk_size);
556	s->next_codebook_buffer_index += chunk_size;
557
558	s->partial_countdown--;
559	if (s->partial_countdown <= 0) {
560
561	/* time to replace codebook */
562	memcpy(s->codebook, s->next_codebook_buffer,
563	s->next_codebook_buffer_index);
564
565	/* reset accounting */
566	s->next_codebook_buffer_index = 0;
567	s->partial_countdown = s->partial_count;
568	}
569	}
570
571	if (cbpz_chunk != -1) {
572
573	bytestream2_seek(&s->gb, cbpz_chunk, SEEK_SET);
574	chunk_size = bytestream2_get_be32(&s->gb);
575
576	if (chunk_size > MAX_CODEBOOK_SIZE - s->next_codebook_buffer_index) {
577	av_log(s->avctx, AV_LOG_ERROR, "cbpz chunk too large (%u bytes)\n",
578	chunk_size);
579	return AVERROR_INVALIDDATA;
580	}
581
582	/* accumulate partial codebook */
583	bytestream2_get_buffer(&s->gb, &s->next_codebook_buffer[s->next_codebook_buffer_index],
584	chunk_size);
585	s->next_codebook_buffer_index += chunk_size;
586
587	s->partial_countdown--;
588	if (s->partial_countdown <= 0) {
589	bytestream2_init(&s->gb, s->next_codebook_buffer, s->next_codebook_buffer_index);
590	/* decompress codebook */
591	if ((res = decode_format80(s, s->next_codebook_buffer_index,
592	s->codebook, s->codebook_size, 0)) < 0)
593	return res;
594
595	/* reset accounting */
596	s->next_codebook_buffer_index = 0;
597	s->partial_countdown = s->partial_count;
598	}
599	}
600
601	return 0;
602	}
603
604	static int vqa_decode_frame(AVCodecContext *avctx,
605	void *data, int *got_frame,
606	AVPacket *avpkt)
607	{
608	VqaContext *s = avctx->priv_data;
609	AVFrame *frame = data;
610	int res;
611
612	if ((res = ff_get_buffer(avctx, frame, 0)) < 0)
613	return res;
614
615	bytestream2_init(&s->gb, avpkt->data, avpkt->size);
616	if ((res = vqa_decode_chunk(s, frame)) < 0)
617	return res;
618
619	/* make the palette available on the way out */
620	memcpy(frame->data[1], s->palette, PALETTE_COUNT * 4);
621	frame->palette_has_changed = 1;
622
623	*got_frame = 1;
624
625	/* report that the buffer was completely consumed */
626	return avpkt->size;
627	}
628
629	static av_cold int vqa_decode_end(AVCodecContext *avctx)
630	{
631	VqaContext *s = avctx->priv_data;
632
633	av_freep(&s->codebook);
634	av_freep(&s->next_codebook_buffer);
635	av_freep(&s->decode_buffer);
636
637	return 0;
638	}
639
640	AVCodec ff_vqa_decoder = {
641	.name = "vqavideo",
642	.long_name = NULL_IF_CONFIG_SMALL("Westwood Studios VQA (Vector Quantized Animation) video"),
643	.type = AVMEDIA_TYPE_VIDEO,
644	.id = AV_CODEC_ID_WS_VQA,
645	.priv_data_size = sizeof(VqaContext),
646	.init = vqa_decode_init,
647	.close = vqa_decode_end,
648	.decode = vqa_decode_frame,
649	.capabilities = AV_CODEC_CAP_DR1,
650	};
651