GCC Code Coverage Report
Directory: ../../../ffmpeg/ Exec Total Coverage
File: src/libavcodec/vqavideo.c Lines: 189 284 66.5 %
Date: 2020-08-13 15:06:06 Branches: 91 159 57.2 %

Line Branch Exec Source
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
4
static av_cold int vqa_decode_init(AVCodecContext *avctx)
122
{
123
4
    VqaContext *s = avctx->priv_data;
124
    int i, j, codebook_index, ret;
125
126
4
    s->avctx = avctx;
127
4
    avctx->pix_fmt = AV_PIX_FMT_PAL8;
128
129
    /* make sure the extradata made it */
130
4
    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
4
    s->vqa_version = s->avctx->extradata[0];
137
4
    switch (s->vqa_version) {
138
4
    case 1:
139
    case 2:
140
4
        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
4
    s->width = AV_RL16(&s->avctx->extradata[6]);
149
4
    s->height = AV_RL16(&s->avctx->extradata[8]);
150
4
    if ((ret = ff_set_dimensions(avctx, s->width, s->height)) < 0) {
151
        s->width= s->height= 0;
152
        return ret;
153
    }
154
4
    s->vector_width = s->avctx->extradata[10];
155
4
    s->vector_height = s->avctx->extradata[11];
156
4
    s->partial_count = s->partial_countdown = s->avctx->extradata[13];
157
158
    /* the vector dimensions have to meet very stringent requirements */
159
4
    if ((s->vector_width != 4) ||
160

4
        ((s->vector_height != 2) && (s->vector_height != 4))) {
161
        /* return without further initialization */
162
        return AVERROR_INVALIDDATA;
163
    }
164
165

4
    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
4
    s->codebook_size = MAX_CODEBOOK_SIZE;
172
4
    s->codebook = av_malloc(s->codebook_size);
173
4
    if (!s->codebook)
174
        goto fail;
175
4
    s->next_codebook_buffer = av_malloc(s->codebook_size);
176
4
    if (!s->next_codebook_buffer)
177
        goto fail;
178
179
    /* allocate decode buffer */
180
4
    s->decode_buffer_size = (s->width / s->vector_width) *
181
4
        (s->height / s->vector_height) * 2;
182
4
    s->decode_buffer = av_mallocz(s->decode_buffer_size);
183
4
    if (!s->decode_buffer)
184
        goto fail;
185
186
    /* initialize the solid-color vectors */
187
4
    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
4
        codebook_index = 0xF00 * 8;
194
1028
        for (i = 0; i < 256; i++)
195
9216
            for (j = 0; j < 8; j++)
196
8192
                s->codebook[codebook_index++] = i;
197
    }
198
4
    s->next_codebook_buffer_index = 0;
199
200
4
    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
38
static int decode_format80(VqaContext *s, int src_size,
226
    unsigned char *dest, int dest_size, int check_size) {
227
228
38
    int dest_index = 0;
229
    int count, opcode, start;
230
    int src_pos;
231
    unsigned char color;
232
    int i;
233
234

38
    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
38
    start = bytestream2_tell(&s->gb);
241
44627
    while (bytestream2_tell(&s->gb) - start < src_size) {
242
44627
        opcode = bytestream2_get_byte(&s->gb);
243
        ff_tlog(s->avctx, "opcode %02X: ", opcode);
244
245
        /* 0x80 means that frame is finished */
246
44627
        if (opcode == 0x80)
247
38
            break;
248
249
44589
        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
44589
        if (opcode == 0xFF) {
256
257
265
            count   = bytestream2_get_le16(&s->gb);
258
265
            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
265
            CHECK_COUNT();
261

265
            CHECK_COPY(src_pos);
262
24430
            for (i = 0; i < count; i++)
263
24165
                dest[dest_index + i] = dest[src_pos + i];
264
265
            dest_index += count;
265
266
44324
        } else if (opcode == 0xFE) {
267
268
440
            count = bytestream2_get_le16(&s->gb);
269
440
            color = bytestream2_get_byte(&s->gb);
270
            ff_tlog(s->avctx, "(2) set %X bytes to %02X\n", count, color);
271
440
            CHECK_COUNT();
272
440
            memset(&dest[dest_index], color, count);
273
440
            dest_index += count;
274
275
43884
        } else if ((opcode & 0xC0) == 0xC0) {
276
277
8741
            count = (opcode & 0x3F) + 3;
278
8741
            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
8741
            CHECK_COUNT();
281

8741
            CHECK_COPY(src_pos);
282
190403
            for (i = 0; i < count; i++)
283
181662
                dest[dest_index + i] = dest[src_pos + i];
284
8741
            dest_index += count;
285
286
35143
        } else if (opcode > 0x80) {
287
288
12393
            count = opcode & 0x3F;
289
            ff_tlog(s->avctx, "(4) copy %X bytes from source to dest\n", count);
290
12393
            CHECK_COUNT();
291
12393
            bytestream2_get_buffer(&s->gb, &dest[dest_index], count);
292
12393
            dest_index += count;
293
294
        } else {
295
296
22750
            count = ((opcode & 0x70) >> 4) + 3;
297
22750
            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
22750
            CHECK_COUNT();
300

22750
            CHECK_COPY(dest_index - src_pos);
301
136572
            for (i = 0; i < count; i++)
302
113822
                dest[dest_index + i] = dest[dest_index - src_pos + i];
303
22750
            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
38
    if (check_size)
312
38
        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
38
    return 0; // let's display what we decoded anyway
319
}
320
321
39
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
39
    unsigned int index = 0;
327
    int i;
328
    unsigned char r, g, b;
329
    int index_shift;
330
    int res;
331
332
39
    int cbf0_chunk = -1;
333
39
    int cbfz_chunk = -1;
334
39
    int cbp0_chunk = -1;
335
39
    int cbpz_chunk = -1;
336
39
    int cpl0_chunk = -1;
337
39
    int cplz_chunk = -1;
338
39
    int vptz_chunk = -1;
339
340
    int x, y;
341
39
    int lines = 0;
342
    int pixel_ptr;
343
39
    int vector_index = 0;
344
39
    int lobyte = 0;
345
39
    int hibyte = 0;
346
39
    int lobytes = 0;
347
39
    int hibytes = s->decode_buffer_size / 2;
348
349
    /* first, traverse through the frame and find the subchunks */
350
118
    while (bytestream2_get_bytes_left(&s->gb) >= 8) {
351
352
79
        chunk_type = bytestream2_get_be32u(&s->gb);
353
79
        index      = bytestream2_tell(&s->gb);
354
79
        chunk_size = bytestream2_get_be32u(&s->gb);
355
356


79
        switch (chunk_type) {
357
358
1
        case CBF0_TAG:
359
1
            cbf0_chunk = index;
360
1
            break;
361
362
        case CBFZ_TAG:
363
            cbfz_chunk = index;
364
            break;
365
366
39
        case CBP0_TAG:
367
39
            cbp0_chunk = index;
368
39
            break;
369
370
        case CBPZ_TAG:
371
            cbpz_chunk = index;
372
            break;
373
374
1
        case CPL0_TAG:
375
1
            cpl0_chunk = index;
376
1
            break;
377
378
        case CPLZ_TAG:
379
            cplz_chunk = index;
380
            break;
381
382
38
        case VPTZ_TAG:
383
38
            vptz_chunk = index;
384
38
            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
79
        byte_skip = chunk_size & 0x01;
393
79
        bytestream2_skip(&s->gb, chunk_size + byte_skip);
394
    }
395
396
    /* next, deal with the palette */
397

39
    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
39
    if (cpl0_chunk != -1) {
413
414
1
        bytestream2_seek(&s->gb, cpl0_chunk, SEEK_SET);
415
1
        chunk_size = bytestream2_get_be32(&s->gb);
416
        /* sanity check the palette size */
417

1
        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
252
        for (i = 0; i < chunk_size / 3; i++) {
423
            /* scale by 4 to transform 6-bit palette -> 8-bit */
424
251
            r = bytestream2_get_byteu(&s->gb) * 4;
425
251
            g = bytestream2_get_byteu(&s->gb) * 4;
426
251
            b = bytestream2_get_byteu(&s->gb) * 4;
427
251
            s->palette[i] = 0xFFU << 24 | r << 16 | g << 8 | b;
428
251
            s->palette[i] |= s->palette[i] >> 6 & 0x30303;
429
        }
430
    }
431
432
    /* next, look for a full codebook */
433

39
    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
39
    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
39
    if (cbf0_chunk != -1) {
452
453
1
        bytestream2_seek(&s->gb, cbf0_chunk, SEEK_SET);
454
1
        chunk_size = bytestream2_get_be32(&s->gb);
455
        /* sanity check the full codebook size */
456
1
        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
1
        bytestream2_get_buffer(&s->gb, s->codebook, chunk_size);
463
    }
464
465
    /* decode the frame */
466
39
    if (vptz_chunk == -1) {
467
468
        /* something is wrong if there is no VPTZ chunk */
469
1
        av_log(s->avctx, AV_LOG_ERROR, "problem: no VPTZ chunk found\n");
470
1
        return AVERROR_INVALIDDATA;
471
    }
472
473
38
    bytestream2_seek(&s->gb, vptz_chunk, SEEK_SET);
474
38
    chunk_size = bytestream2_get_be32(&s->gb);
475
38
    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
38
    if (s->vector_height == 4)
481
        index_shift = 4;
482
    else
483
38
        index_shift = 3;
484
3838
    for (y = 0; y < s->height; y += s->vector_height) {
485
307800
        for (x = 0; x < s->width; x += 4, lobytes++, hibytes++) {
486
304000
            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

304000
            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
304000
            case 2:
512
304000
                lobyte = s->decode_buffer[lobytes];
513
304000
                hibyte = s->decode_buffer[hibytes];
514
304000
                vector_index = (hibyte << 8) | lobyte;
515
304000
                vector_index <<= index_shift;
516
304000
                lines = s->vector_height;
517
304000
                break;
518
519
            case 3:
520
/* not implemented yet */
521
                lines = 0;
522
                break;
523
            }
524
525
912000
            while (lines--) {
526
608000
                frame->data[0][pixel_ptr + 0] = s->codebook[vector_index++];
527
608000
                frame->data[0][pixel_ptr + 1] = s->codebook[vector_index++];
528
608000
                frame->data[0][pixel_ptr + 2] = s->codebook[vector_index++];
529
608000
                frame->data[0][pixel_ptr + 3] = s->codebook[vector_index++];
530
608000
                pixel_ptr += frame->linesize[0];
531
            }
532
        }
533
    }
534
535
    /* handle partial codebook */
536

38
    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
38
    if (cbp0_chunk != -1) {
543
544
38
        bytestream2_seek(&s->gb, cbp0_chunk, SEEK_SET);
545
38
        chunk_size = bytestream2_get_be32(&s->gb);
546
547
38
        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
38
        bytestream2_get_buffer(&s->gb, &s->next_codebook_buffer[s->next_codebook_buffer_index],
555
                               chunk_size);
556
38
        s->next_codebook_buffer_index += chunk_size;
557
558
38
        s->partial_countdown--;
559
38
        if (s->partial_countdown <= 0) {
560
561
            /* time to replace codebook */
562
4
            memcpy(s->codebook, s->next_codebook_buffer,
563
4
                s->next_codebook_buffer_index);
564
565
            /* reset accounting */
566
4
            s->next_codebook_buffer_index = 0;
567
4
            s->partial_countdown = s->partial_count;
568
        }
569
    }
570
571
38
    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
38
    return 0;
602
}
603
604
39
static int vqa_decode_frame(AVCodecContext *avctx,
605
                            void *data, int *got_frame,
606
                            AVPacket *avpkt)
607
{
608
39
    VqaContext *s = avctx->priv_data;
609
39
    AVFrame *frame = data;
610
    int res;
611
612
39
    if ((res = ff_get_buffer(avctx, frame, 0)) < 0)
613
        return res;
614
615
39
    bytestream2_init(&s->gb, avpkt->data, avpkt->size);
616
39
    if ((res = vqa_decode_chunk(s, frame)) < 0)
617
1
        return res;
618
619
    /* make the palette available on the way out */
620
38
    memcpy(frame->data[1], s->palette, PALETTE_COUNT * 4);
621
38
    frame->palette_has_changed = 1;
622
623
38
    *got_frame      = 1;
624
625
    /* report that the buffer was completely consumed */
626
38
    return avpkt->size;
627
}
628
629
4
static av_cold int vqa_decode_end(AVCodecContext *avctx)
630
{
631
4
    VqaContext *s = avctx->priv_data;
632
633
4
    av_freep(&s->codebook);
634
4
    av_freep(&s->next_codebook_buffer);
635
4
    av_freep(&s->decode_buffer);
636
637
4
    return 0;
638
}
639
640
static const AVCodecDefault vqa_defaults[] = {
641
    { "max_pixels", "320*240" },
642
    { NULL },
643
};
644
645
AVCodec ff_vqa_decoder = {
646
    .name           = "vqavideo",
647
    .long_name      = NULL_IF_CONFIG_SMALL("Westwood Studios VQA (Vector Quantized Animation) video"),
648
    .type           = AVMEDIA_TYPE_VIDEO,
649
    .id             = AV_CODEC_ID_WS_VQA,
650
    .priv_data_size = sizeof(VqaContext),
651
    .init           = vqa_decode_init,
652
    .close          = vqa_decode_end,
653
    .decode         = vqa_decode_frame,
654
    .capabilities   = AV_CODEC_CAP_DR1,
655
    .defaults       = vqa_defaults,
656
};