FFmpeg coverage

Directory: ../../../ffmpeg/
File: src/libavcodec/vqavideo.c
Date: 2026-01-23 14:02:51
Exec Total Coverage
Lines: 197 401 49.1%
Functions: 5 6 83.3%
Branches: 101 241 41.9%
Line Branch Exec Source
1 /*
2 * Westwood Studios VQA Video Decoder
3 * Copyright (c) 2003 Mike Melanson <melanson@pcisys.net>
4 * Copyright (c) 2021 Pekka Väänänen <pekka.vaananen@iki.fi>
5 *
6 * This file is part of FFmpeg.
7 *
8 * FFmpeg is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU Lesser General Public
10 * License as published by the Free Software Foundation; either
11 * version 2.1 of the License, or (at your option) any later version.
12 *
13 * FFmpeg is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 * Lesser General Public License for more details.
17 *
18 * You should have received a copy of the GNU Lesser General Public
19 * License along with FFmpeg; if not, write to the Free Software
20 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
21 */
22
23 /**
24 * @file
25 * VQA Video Decoder
26 * @author Mike Melanson (melanson@pcisys.net)
27 * @see http://wiki.multimedia.cx/index.php?title=VQA
28 *
29 * The VQA video decoder outputs PAL8 or RGB555 colorspace data, depending
30 * on the type of data in the file.
31 *
32 * This decoder needs the 42-byte VQHD header from the beginning
33 * of the VQA file passed through the extradata field. The VQHD header
34 * is laid out as:
35 *
36 * bytes 0-3 chunk fourcc: 'VQHD'
37 * bytes 4-7 chunk size in big-endian format, should be 0x0000002A
38 * bytes 8-49 VQHD chunk data
39 *
40 * Bytes 8-49 are what this decoder expects to see.
41 *
42 * Briefly, VQA is a vector quantized animation format that operates in a
43 * VGA palettized colorspace. It operates on pixel vectors (blocks)
44 * of either 4x2 or 4x4 in size. Compressed VQA chunks can contain vector
45 * codebooks, palette information, and code maps for rendering vectors onto
46 * frames. Any of these components can also be compressed with a run-length
47 * encoding (RLE) algorithm commonly referred to as "format80".
48 *
49 * VQA takes a novel approach to rate control. Each group of n frames
50 * (usually, n = 8) relies on a different vector codebook. Rather than
51 * transporting an entire codebook every 8th frame, the new codebook is
52 * broken up into 8 pieces and sent along with the compressed video chunks
53 * for each of the 8 frames preceding the 8 frames which require the
54 * codebook. A full codebook is also sent on the very first frame of a
55 * file. This is an interesting technique, although it makes random file
56 * seeking difficult despite the fact that the frames are all intracoded.
57 *
58 * V1,2 VQA uses 12-bit codebook indexes. If the 12-bit indexes were
59 * packed into bytes and then RLE compressed, bytewise, the results would
60 * be poor. That is why the coding method divides each index into 2 parts,
61 * the top 4 bits and the bottom 8 bits, then RL encodes the 4-bit pieces
62 * together and the 8-bit pieces together. If most of the vectors are
63 * clustered into one group of 256 vectors, most of the 4-bit index pieces
64 * should be the same.
65 *
66 * VQA3 introduces a 15-bit high color codebook, delta coding, replaces
67 * the above "split byte" scheme with RLE compression, and extends the
68 * "format80" compression with relative references. In VQA3 the whole
69 * codebook is always updated as a whole without splitting it into pieces.
70 */
71
72 #include <stdio.h>
73 #include <string.h>
74
75 #include "libavutil/intreadwrite.h"
76 #include "libavutil/mem.h"
77 #include "avcodec.h"
78 #include "bytestream.h"
79 #include "codec_internal.h"
80 #include "decode.h"
81
82 #define PALETTE_COUNT 256
83 #define VQA_HEADER_SIZE 0x2A
84
85 /* allocate the maximum vector space, regardless of the file version:
86 * (0xFF00 codebook vectors + 0x100 solid pixel vectors) * (4x4 pixels/block) */
87 #define MAX_CODEBOOK_VECTORS 0xFF00
88 #define SOLID_PIXEL_VECTORS 0x100
89 #define MAX_VECTORS (MAX_CODEBOOK_VECTORS + SOLID_PIXEL_VECTORS)
90 #define MAX_CODEBOOK_SIZE (MAX_VECTORS * 4 * 4 * sizeof(uint16_t))
91
92 #define CBF0_TAG MKBETAG('C', 'B', 'F', '0')
93 #define CBFZ_TAG MKBETAG('C', 'B', 'F', 'Z')
94 #define CBP0_TAG MKBETAG('C', 'B', 'P', '0')
95 #define CBPZ_TAG MKBETAG('C', 'B', 'P', 'Z')
96 #define CPL0_TAG MKBETAG('C', 'P', 'L', '0')
97 #define CPLZ_TAG MKBETAG('C', 'P', 'L', 'Z')
98 #define VPTZ_TAG MKBETAG('V', 'P', 'T', 'Z')
99 #define VPTR_TAG MKBETAG('V', 'P', 'T', 'R')
100 #define VPRZ_TAG MKBETAG('V', 'P', 'R', 'Z')
101
102 typedef struct VqaContext {
103 AVFrame *frame;
104 AVCodecContext *avctx;
105 GetByteContext gb;
106
107 uint32_t palette[PALETTE_COUNT];
108
109 int width; /* width of a frame */
110 int height; /* height of a frame */
111 int vector_width; /* width of individual vector */
112 int vector_height; /* height of individual vector */
113 int vqa_version; /* this should be either 1, 2 or 3 */
114
115 unsigned char *codebook; /* the current codebook */
116 int codebook_size;
117 unsigned char *next_codebook_buffer; /* accumulator for next codebook */
118 int next_codebook_buffer_index;
119
120 unsigned char *decode_buffer;
121 int decode_buffer_size;
122
123 /* number of frames to go before replacing codebook */
124 int partial_countdown;
125 int partial_count;
126 } VqaContext;
127
128 5 static av_cold int vqa_decode_init(AVCodecContext *avctx)
129 {
130 5 VqaContext *s = avctx->priv_data;
131 int i, j, codebook_index, ret;
132 int colors;
133
134 5 s->avctx = avctx;
135
136 /* make sure the extradata made it */
137
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 5 if (s->avctx->extradata_size != VQA_HEADER_SIZE) {
138 ✗ av_log(s->avctx, AV_LOG_ERROR, "expected extradata size of %d\n", VQA_HEADER_SIZE);
139 ✗ return AVERROR(EINVAL);
140 }
141
142 /* load up the VQA parameters from the header */
143 5 s->vqa_version = s->avctx->extradata[0];
144
145
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 5 if (s->vqa_version < 1 || s->vqa_version > 3) {
146 ✗ avpriv_request_sample(avctx, "VQA Version %i", s->vqa_version);
147 ✗ return AVERROR_INVALIDDATA;
148 }
149
150 5 s->width = AV_RL16(&s->avctx->extradata[6]);
151 5 s->height = AV_RL16(&s->avctx->extradata[8]);
152
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 5 if ((ret = ff_set_dimensions(avctx, s->width, s->height)) < 0) {
153 ✗ s->width= s->height= 0;
154 ✗ return ret;
155 }
156 5 s->vector_width = s->avctx->extradata[10];
157 5 s->vector_height = s->avctx->extradata[11];
158 5 s->partial_count = s->partial_countdown = s->avctx->extradata[13];
159
160 5 colors = (s->avctx->extradata[14] << 8) | s->avctx->extradata[15];
161
162
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 5 if (colors > 0) {
163 4 avctx->pix_fmt = AV_PIX_FMT_PAL8;
164 } else {
165 1 avctx->pix_fmt = AV_PIX_FMT_RGB555LE;
166 }
167
168 /* the vector dimensions have to meet very stringent requirements */
169
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 5 if ((s->vector_width != 4) ||
170
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 5 ((s->vector_height != 2) && (s->vector_height != 4))) {
171 /* return without further initialization */
172 ✗ return AVERROR_INVALIDDATA;
173 }
174
175
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 5 if (s->width % s->vector_width || s->height % s->vector_height) {
176 ✗ av_log(avctx, AV_LOG_ERROR, "Image size not multiple of block size\n");
177 ✗ return AVERROR_INVALIDDATA;
178 }
179
180 5 s->frame = av_frame_alloc();
181
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 5 if (!s->frame)
182 ✗ return AVERROR(ENOMEM);
183
184 /* allocate codebooks */
185 5 s->codebook_size = MAX_CODEBOOK_SIZE;
186 5 s->codebook = av_malloc(s->codebook_size);
187
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 5 if (!s->codebook)
188 ✗ return AVERROR(ENOMEM);
189 5 s->next_codebook_buffer = av_malloc(s->codebook_size);
190
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 5 if (!s->next_codebook_buffer)
191 ✗ return AVERROR(ENOMEM);
192
193 /* allocate decode buffer */
194 5 s->decode_buffer_size = (s->width / s->vector_width) *
195 5 (s->height / s->vector_height) * 2;
196 5 s->decode_buffer = av_mallocz(s->decode_buffer_size);
197
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 5 if (!s->decode_buffer)
198 ✗ return AVERROR(ENOMEM);
199
200 /* initialize the solid-color vectors */
201
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 5 if (s->vector_height == 4) {
202 ✗ codebook_index = 0xFF00 * 16;
203 ✗ for (i = 0; i < 256; i++)
204 ✗ for (j = 0; j < 16; j++)
205 ✗ s->codebook[codebook_index++] = i;
206 } else {
207 5 codebook_index = 0xF00 * 8;
208
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 1285 for (i = 0; i < 256; i++)
209
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 11520 for (j = 0; j < 8; j++)
210 10240 s->codebook[codebook_index++] = i;
211 }
212 5 s->next_codebook_buffer_index = 0;
213
214 5 return 0;
215 }
216
217 #define CHECK_COUNT() \
218 if (dest_index + count > dest_size) { \
219 av_log(s->avctx, AV_LOG_ERROR, "decode_format80 problem: next op would overflow dest_index\n"); \
220 av_log(s->avctx, AV_LOG_ERROR, "current dest_index = %d, count = %d, dest_size = %d\n", \
221 dest_index, count, dest_size); \
222 return AVERROR_INVALIDDATA; \
223 }
224
225 #define CHECK_COPY(idx) \
226 if (idx < 0 || idx + count > dest_size) { \
227 av_log(s->avctx, AV_LOG_ERROR, "decode_format80 problem: next op would overflow dest_index\n"); \
228 av_log(s->avctx, AV_LOG_ERROR, "current src_pos = %d, count = %d, dest_size = %d\n", \
229 src_pos, count, dest_size); \
230 return AVERROR_INVALIDDATA; \
231 }
232
233
234 38 static int decode_format80(VqaContext *s, int src_size,
235 unsigned char *dest, int dest_size, int check_size) {
236
237 38 int dest_index = 0;
238 int count, opcode, start;
239 int src_pos;
240 unsigned char color;
241 int i;
242 38 int relative = 0;
243
244
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 38 if (src_size < 0 || src_size > bytestream2_get_bytes_left(&s->gb)) {
245 ✗ av_log(s->avctx, AV_LOG_ERROR, "Chunk size %d is out of range\n",
246 src_size);
247 ✗ return AVERROR_INVALIDDATA;
248 }
249
250 /* the "new" scheme makes references relative to destination pointer */
251
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 38 if (bytestream2_peek_byte(&s->gb) == 0x00) {
252 ✗ relative = 1;
253 ✗ bytestream2_get_byte(&s->gb);
254 ff_tlog(s->avctx, "found new format stream ");
255 }
256
257 38 start = bytestream2_tell(&s->gb);
258
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 44627 while (bytestream2_tell(&s->gb) - start < src_size) {
259 44627 opcode = bytestream2_get_byte(&s->gb);
260 ff_tlog(s->avctx, "opcode %02X: ", opcode);
261
262 /* 0x80 means that frame is finished */
263
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 44627 if (opcode == 0x80)
264 38 break;
265
266
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 44589 if (dest_index >= dest_size) {
267 ✗ av_log(s->avctx, AV_LOG_ERROR, "decode_format80 problem: dest_index (%d) exceeded dest_size (%d)\n",
268 dest_index, dest_size);
269 ✗ return AVERROR_INVALIDDATA;
270 }
271
272
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 44589 if (opcode == 0xFF) {
273
274 265 count = bytestream2_get_le16(&s->gb);
275 265 src_pos = bytestream2_get_le16(&s->gb);
276
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 265 if (relative)
277 ✗ src_pos = dest_index - src_pos;
278 ff_tlog(s->avctx, "(1) copy %X bytes from pos %X\n", count, src_pos);
279
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 265 CHECK_COUNT();
280
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 265 CHECK_COPY(src_pos);
281
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 24430 for (i = 0; i < count; i++)
282 24165 dest[dest_index + i] = dest[src_pos + i];
283 265 dest_index += count;
284
285
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 44324 } else if (opcode == 0xFE) {
286
287 440 count = bytestream2_get_le16(&s->gb);
288 440 color = bytestream2_get_byte(&s->gb);
289 ff_tlog(s->avctx, "(2) set %X bytes to %02X\n", count, color);
290
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 440 CHECK_COUNT();
291 440 memset(&dest[dest_index], color, count);
292 440 dest_index += count;
293
294
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 43884 } else if ((opcode & 0xC0) == 0xC0) {
295
296 8741 count = (opcode & 0x3F) + 3;
297 8741 src_pos = bytestream2_get_le16(&s->gb);
298
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 8741 if (relative)
299 ✗ src_pos = dest_index - src_pos;
300 ff_tlog(s->avctx, "(3) copy %X bytes from pos %X\n", count, src_pos);
301
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 8741 CHECK_COUNT();
302
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 8741 CHECK_COPY(src_pos);
303
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 190403 for (i = 0; i < count; i++)
304 181662 dest[dest_index + i] = dest[src_pos + i];
305 8741 dest_index += count;
306
307
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 35143 } else if (opcode > 0x80) {
308
309 12393 count = opcode & 0x3F;
310 ff_tlog(s->avctx, "(4) copy %X bytes from source to dest\n", count);
311
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 12393 CHECK_COUNT();
312 12393 bytestream2_get_buffer(&s->gb, &dest[dest_index], count);
313 12393 dest_index += count;
314
315 } else {
316
317 22750 count = ((opcode & 0x70) >> 4) + 3;
318 22750 src_pos = bytestream2_get_byte(&s->gb) | ((opcode & 0x0F) << 8);
319 ff_tlog(s->avctx, "(5) copy %X bytes from relpos %X\n", count, src_pos);
320
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 22750 CHECK_COUNT();
321
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 22750 CHECK_COPY(dest_index - src_pos);
322
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 136572 for (i = 0; i < count; i++)
323 113822 dest[dest_index + i] = dest[dest_index - src_pos + i];
324 22750 dest_index += count;
325 }
326 }
327
328 /* validate that the entire destination buffer was filled; this is
329 * important for decoding frame maps since each vector needs to have a
330 * codebook entry; it is not important for compressed codebooks because
331 * not every entry needs to be filled */
332
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 38 if (check_size)
333
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 38 if (dest_index < dest_size) {
334 ✗ av_log(s->avctx, AV_LOG_ERROR, "decode_format80 problem: decode finished with dest_index (%d) < dest_size (%d)\n",
335 dest_index, dest_size);
336 ✗ memset(dest + dest_index, 0, dest_size - dest_index);
337 }
338
339 38 return 0; // let's display what we decoded anyway
340 }
341
342 39 static int vqa_decode_frame_pal8(VqaContext *s, AVFrame *frame)
343 {
344 unsigned int chunk_type;
345 unsigned int chunk_size;
346 int byte_skip;
347 39 unsigned int index = 0;
348 int i;
349 unsigned char r, g, b;
350 int index_shift;
351 int res;
352
353 39 int cbf0_chunk = -1;
354 39 int cbfz_chunk = -1;
355 39 int cbp0_chunk = -1;
356 39 int cbpz_chunk = -1;
357 39 int cpl0_chunk = -1;
358 39 int cplz_chunk = -1;
359 39 int vptz_chunk = -1;
360
361 int x, y;
362 39 int lines = 0;
363 int pixel_ptr;
364 39 int vector_index = 0;
365 39 int lobyte = 0;
366 39 int hibyte = 0;
367 39 int lobytes = 0;
368 39 int hibytes = s->decode_buffer_size / 2;
369
370 /* first, traverse through the frame and find the subchunks */
371
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 118 while (bytestream2_get_bytes_left(&s->gb) >= 8) {
372
373 79 chunk_type = bytestream2_get_be32u(&s->gb);
374 79 index = bytestream2_tell(&s->gb);
375 79 chunk_size = bytestream2_get_be32u(&s->gb);
376
377
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 79 switch (chunk_type) {
378
379 1 case CBF0_TAG:
380 1 cbf0_chunk = index;
381 1 break;
382
383 ✗ case CBFZ_TAG:
384 ✗ cbfz_chunk = index;
385 ✗ break;
386
387 39 case CBP0_TAG:
388 39 cbp0_chunk = index;
389 39 break;
390
391 ✗ case CBPZ_TAG:
392 ✗ cbpz_chunk = index;
393 ✗ break;
394
395 1 case CPL0_TAG:
396 1 cpl0_chunk = index;
397 1 break;
398
399 ✗ case CPLZ_TAG:
400 ✗ cplz_chunk = index;
401 ✗ break;
402
403 38 case VPTZ_TAG:
404 38 vptz_chunk = index;
405 38 break;
406
407 ✗ default:
408 ✗ av_log(s->avctx, AV_LOG_ERROR, "Found unknown chunk type: %s (%08X)\n",
409 ✗ av_fourcc2str(av_bswap32(chunk_type)), chunk_type);
410 ✗ break;
411 }
412
413 79 byte_skip = chunk_size & 0x01;
414 79 bytestream2_skip(&s->gb, chunk_size + byte_skip);
415 }
416
417 /* next, deal with the palette */
418
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 39 if ((cpl0_chunk != -1) && (cplz_chunk != -1)) {
419
420 /* a chunk should not have both chunk types */
421 ✗ av_log(s->avctx, AV_LOG_ERROR, "problem: found both CPL0 and CPLZ chunks\n");
422 ✗ return AVERROR_INVALIDDATA;
423 }
424
425 /* decompress the palette chunk */
426 if (cplz_chunk != -1) {
427
428 /* yet to be handled */
429
430 }
431
432 /* convert the RGB palette into the machine's endian format */
433
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 39 if (cpl0_chunk != -1) {
434
435 1 bytestream2_seek(&s->gb, cpl0_chunk, SEEK_SET);
436 1 chunk_size = bytestream2_get_be32(&s->gb);
437 /* sanity check the palette size */
438
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 1 if (chunk_size / 3 > 256 || chunk_size > bytestream2_get_bytes_left(&s->gb)) {
439 ✗ av_log(s->avctx, AV_LOG_ERROR, "problem: found a palette chunk with %d colors\n",
440 chunk_size / 3);
441 ✗ return AVERROR_INVALIDDATA;
442 }
443
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 252 for (i = 0; i < chunk_size / 3; i++) {
444 /* scale by 4 to transform 6-bit palette -> 8-bit */
445 251 r = bytestream2_get_byteu(&s->gb) * 4;
446 251 g = bytestream2_get_byteu(&s->gb) * 4;
447 251 b = bytestream2_get_byteu(&s->gb) * 4;
448 251 s->palette[i] = 0xFFU << 24 | r << 16 | g << 8 | b;
449 251 s->palette[i] |= s->palette[i] >> 6 & 0x30303;
450 }
451 }
452
453 /* next, look for a full codebook */
454
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 39 if ((cbf0_chunk != -1) && (cbfz_chunk != -1)) {
455
456 /* a chunk should not have both chunk types */
457 ✗ av_log(s->avctx, AV_LOG_ERROR, "problem: found both CBF0 and CBFZ chunks\n");
458 ✗ return AVERROR_INVALIDDATA;
459 }
460
461 /* decompress the full codebook chunk */
462
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 39 if (cbfz_chunk != -1) {
463
464 ✗ bytestream2_seek(&s->gb, cbfz_chunk, SEEK_SET);
465 ✗ chunk_size = bytestream2_get_be32(&s->gb);
466 ✗ if ((res = decode_format80(s, chunk_size, s->codebook,
467 s->codebook_size, 0)) < 0)
468 ✗ return res;
469 }
470
471 /* copy a full codebook */
472
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 39 if (cbf0_chunk != -1) {
473
474 1 bytestream2_seek(&s->gb, cbf0_chunk, SEEK_SET);
475 1 chunk_size = bytestream2_get_be32(&s->gb);
476 /* sanity check the full codebook size */
477
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 1 if (chunk_size > MAX_CODEBOOK_SIZE) {
478 ✗ av_log(s->avctx, AV_LOG_ERROR, "problem: CBF0 chunk too large (0x%X bytes)\n",
479 chunk_size);
480 ✗ return AVERROR_INVALIDDATA;
481 }
482
483 1 bytestream2_get_buffer(&s->gb, s->codebook, chunk_size);
484 }
485
486 /* decode the frame */
487
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 39 if (vptz_chunk == -1) {
488
489 /* something is wrong if there is no VPTZ chunk */
490 1 av_log(s->avctx, AV_LOG_ERROR, "problem: no VPTZ chunk found\n");
491 1 return AVERROR_INVALIDDATA;
492 }
493
494 38 bytestream2_seek(&s->gb, vptz_chunk, SEEK_SET);
495 38 chunk_size = bytestream2_get_be32(&s->gb);
496
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 38 if ((res = decode_format80(s, chunk_size,
497 s->decode_buffer, s->decode_buffer_size, 1)) < 0)
498 ✗ return res;
499
500 /* render the final PAL8 frame */
501
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 38 if (s->vector_height == 4)
502 ✗ index_shift = 4;
503 else
504 38 index_shift = 3;
505
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 3838 for (y = 0; y < s->height; y += s->vector_height) {
506
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 307800 for (x = 0; x < s->width; x += 4, lobytes++, hibytes++) {
507 304000 pixel_ptr = y * frame->linesize[0] + x;
508
509 /* get the vector index, the method for which varies according to
510 * VQA file version */
511
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 304000 switch (s->vqa_version) {
512
513 ✗ case 1:
514 ✗ lobyte = s->decode_buffer[lobytes * 2];
515 ✗ hibyte = s->decode_buffer[(lobytes * 2) + 1];
516 ✗ vector_index = ((hibyte << 8) | lobyte) >> 3;
517 ✗ vector_index <<= index_shift;
518 ✗ lines = s->vector_height;
519 /* uniform color fill - a quick hack */
520 ✗ if (hibyte == 0xFF) {
521 ✗ while (lines--) {
522 ✗ frame->data[0][pixel_ptr + 0] = 255 - lobyte;
523 ✗ frame->data[0][pixel_ptr + 1] = 255 - lobyte;
524 ✗ frame->data[0][pixel_ptr + 2] = 255 - lobyte;
525 ✗ frame->data[0][pixel_ptr + 3] = 255 - lobyte;
526 ✗ pixel_ptr += frame->linesize[0];
527 }
528 ✗ lines=0;
529 }
530 ✗ break;
531
532 304000 case 2:
533 304000 lobyte = s->decode_buffer[lobytes];
534 304000 hibyte = s->decode_buffer[hibytes];
535 304000 vector_index = (hibyte << 8) | lobyte;
536 304000 vector_index <<= index_shift;
537 304000 lines = s->vector_height;
538 304000 break;
539
540 ✗ case 3:
541 ✗ av_log(s->avctx, AV_LOG_ERROR, "VQA3 shouldn't have a color palette");
542 ✗ return AVERROR_INVALIDDATA;
543 }
544
545
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 912000 while (lines--) {
546 608000 frame->data[0][pixel_ptr + 0] = s->codebook[vector_index++];
547 608000 frame->data[0][pixel_ptr + 1] = s->codebook[vector_index++];
548 608000 frame->data[0][pixel_ptr + 2] = s->codebook[vector_index++];
549 608000 frame->data[0][pixel_ptr + 3] = s->codebook[vector_index++];
550 608000 pixel_ptr += frame->linesize[0];
551 }
552 }
553 }
554
555 /* handle partial codebook */
556
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 38 if ((cbp0_chunk != -1) && (cbpz_chunk != -1)) {
557 /* a chunk should not have both chunk types */
558 ✗ av_log(s->avctx, AV_LOG_ERROR, "problem: found both CBP0 and CBPZ chunks\n");
559 ✗ return AVERROR_INVALIDDATA;
560 }
561
562
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 38 if (cbp0_chunk != -1) {
563
564 38 bytestream2_seek(&s->gb, cbp0_chunk, SEEK_SET);
565 38 chunk_size = bytestream2_get_be32(&s->gb);
566
567
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 38 if (chunk_size > MAX_CODEBOOK_SIZE - s->next_codebook_buffer_index) {
568 ✗ av_log(s->avctx, AV_LOG_ERROR, "cbp0 chunk too large (%u bytes)\n",
569 chunk_size);
570 ✗ return AVERROR_INVALIDDATA;
571 }
572
573 /* accumulate partial codebook */
574
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 38 if (chunk_size != bytestream2_get_buffer(&s->gb, &s->next_codebook_buffer[s->next_codebook_buffer_index],
575 chunk_size))
576 ✗ return AVERROR_INVALIDDATA;
577 38 s->next_codebook_buffer_index += chunk_size;
578
579 38 s->partial_countdown--;
580
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 38 if (s->partial_countdown <= 0) {
581
582 /* time to replace codebook */
583 4 memcpy(s->codebook, s->next_codebook_buffer,
584 4 s->next_codebook_buffer_index);
585
586 /* reset accounting */
587 4 s->next_codebook_buffer_index = 0;
588 4 s->partial_countdown = s->partial_count;
589 }
590 }
591
592
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 38 if (cbpz_chunk != -1) {
593
594 ✗ bytestream2_seek(&s->gb, cbpz_chunk, SEEK_SET);
595 ✗ chunk_size = bytestream2_get_be32(&s->gb);
596
597 ✗ if (chunk_size > MAX_CODEBOOK_SIZE - s->next_codebook_buffer_index) {
598 ✗ av_log(s->avctx, AV_LOG_ERROR, "cbpz chunk too large (%u bytes)\n",
599 chunk_size);
600 ✗ return AVERROR_INVALIDDATA;
601 }
602
603 /* accumulate partial codebook */
604 ✗ if (chunk_size != bytestream2_get_buffer(&s->gb, &s->next_codebook_buffer[s->next_codebook_buffer_index],
605 chunk_size))
606 ✗ return AVERROR_INVALIDDATA;
607 ✗ s->next_codebook_buffer_index += chunk_size;
608
609 ✗ s->partial_countdown--;
610 ✗ if (s->partial_countdown <= 0) {
611 ✗ bytestream2_init(&s->gb, s->next_codebook_buffer, s->next_codebook_buffer_index);
612 /* decompress codebook */
613 ✗ res = decode_format80(s, s->next_codebook_buffer_index,
614 s->codebook, s->codebook_size, 0);
615
616 /* reset accounting */
617 ✗ s->next_codebook_buffer_index = 0;
618 ✗ s->partial_countdown = s->partial_count;
619 ✗ if (res < 0)
620 ✗ return res;
621 }
622 }
623
624 38 return 0;
625 }
626
627 ✗ static int vqa_decode_frame_hicolor(VqaContext *s, AVFrame *frame)
628 {
629 unsigned int chunk_type;
630 unsigned int chunk_size;
631 ✗ unsigned int index = 0;
632 int res;
633
634 ✗ int cbf0_chunk = -1;
635 ✗ int cbfz_chunk = -1;
636 ✗ int vptr_chunk = -1;
637 ✗ int vprz_chunk = -1;
638
639 GetByteContext gb_stream;
640
641 ✗ while (bytestream2_get_bytes_left(&s->gb) >= 8) {
642 ✗ chunk_type = bytestream2_get_be32u(&s->gb);
643 ✗ index = bytestream2_tell(&s->gb);
644 ✗ chunk_size = bytestream2_get_be32u(&s->gb);
645
646 ✗ switch (chunk_type) {
647 ✗ case CBF0_TAG:
648 ✗ cbf0_chunk = index;
649 ✗ break;
650 ✗ case CBFZ_TAG:
651 ✗ cbfz_chunk = index;
652 ✗ break;
653 ✗ case VPTR_TAG:
654 ✗ vptr_chunk = index;
655 ✗ break;
656 ✗ case VPRZ_TAG:
657 ✗ vprz_chunk = index;
658 ✗ break;
659 ✗ default:
660 ✗ av_log(s->avctx, AV_LOG_ERROR, "Found unknown chunk type: %s (%08X)\n",
661 ✗ av_fourcc2str(av_bswap32(chunk_type)), chunk_type);
662 ✗ break;
663 }
664
665 ✗ bytestream2_skip(&s->gb, chunk_size + (chunk_size & 0x01));
666 }
667
668 /* next, look for a full codebook */
669 ✗ if ((cbf0_chunk != -1) && (cbfz_chunk != -1)) {
670 /* a chunk should not have both chunk types */
671 ✗ av_log(s->avctx, AV_LOG_ERROR, "problem: found both CBF0 and CBFZ chunks\n");
672 ✗ return AVERROR_INVALIDDATA;
673 }
674
675 /* decompress the full codebook chunk */
676 ✗ if (cbfz_chunk != -1) {
677 ✗ bytestream2_seek(&s->gb, cbfz_chunk, SEEK_SET);
678 ✗ chunk_size = bytestream2_get_be32(&s->gb);
679 ✗ if ((res = decode_format80(s, chunk_size, s->codebook,
680 s->codebook_size, 0)) < 0)
681 ✗ return res;
682 }
683
684 /* copy a full codebook */
685 ✗ if (cbf0_chunk != -1) {
686 ✗ bytestream2_seek(&s->gb, cbf0_chunk, SEEK_SET);
687 ✗ chunk_size = bytestream2_get_be32(&s->gb);
688 /* sanity check the full codebook size */
689 ✗ if (chunk_size > MAX_CODEBOOK_SIZE) {
690 ✗ av_log(s->avctx, AV_LOG_ERROR, "problem: CBF0 chunk too large (0x%X bytes)\n",
691 chunk_size);
692 ✗ return AVERROR_INVALIDDATA;
693 }
694
695 ✗ bytestream2_get_buffer(&s->gb, s->codebook, chunk_size);
696 }
697
698 /* decode the frame */
699
700 ✗ if (vptr_chunk != -1) {
701 /* copy uncompressed tile data */
702 ✗ bytestream2_seek(&s->gb, vptr_chunk, SEEK_SET);
703 ✗ chunk_size = bytestream2_get_be32(&s->gb);
704 ✗ if (chunk_size > s->decode_buffer_size) {
705 ✗ av_log(s->avctx, AV_LOG_ERROR, "VPTR chunk didn't fit in decode buffer");
706 ✗ return AVERROR_INVALIDDATA;
707 }
708 ✗ bytestream2_get_buffer(&s->gb, s->decode_buffer, chunk_size);
709 ✗ } else if (vprz_chunk != -1) {
710 /* decompress the tile data */
711 ✗ bytestream2_seek(&s->gb, vprz_chunk, SEEK_SET);
712
713 ✗ chunk_size = bytestream2_get_be32(&s->gb);
714 ✗ if ((res = decode_format80(s, chunk_size, s->decode_buffer, s->decode_buffer_size, 0)) < 0)
715 ✗ return res;
716 } else {
717 ✗ av_log(s->avctx, AV_LOG_ERROR, "frame has no block data\n");
718 ✗ return AVERROR_INVALIDDATA;
719 }
720
721 /* now uncompress the per-row RLE of the decode buffer and draw the blocks in framebuffer */
722
723 ✗ bytestream2_init(&gb_stream, s->decode_buffer, s->decode_buffer_size);
724
725 ✗ for (int y_pos = 0; y_pos < s->height; y_pos += s->vector_height) {
726 ✗ int x_pos = 0;
727
728 ✗ while (x_pos < s->width) {
729 ✗ int vector_index = 0;
730 ✗ int count = 0;
731 uint16_t code;
732 int type;
733
734 ✗ if (bytestream2_get_bytes_left(&gb_stream) < 2)
735 ✗ return AVERROR_INVALIDDATA;
736
737 ✗ code = bytestream2_get_le16(&gb_stream);
738
739 ✗ type = code >> 13;
740 ✗ code &= 0x1fff;
741
742 ✗ if (type == 0) {
743 ✗ x_pos += 4 * code;
744 ✗ continue;
745 ✗ } else if (type < 3) {
746 ✗ vector_index = code & 0xff;
747 ✗ count = ((code & 0x1f00) >> 7) + 1 + type;
748 ✗ } else if (type < 5) {
749 ✗ vector_index = code;
750 ✗ count = 1;
751 ✗ } else if (type < 7) {
752 ✗ vector_index = code;
753 ✗ count = bytestream2_get_byte(&gb_stream);
754 } else {
755 ✗ av_log(s->avctx, AV_LOG_ERROR, " unknown type in VPTR chunk (%d)\n",type);
756 ✗ return AVERROR_INVALIDDATA;
757 }
758
759 ✗ if (count < 0 || count > (s->width - x_pos) / s->vector_width) {
760 ✗ av_log(s->avctx, AV_LOG_ERROR, "invalid count: %d\n", count);
761 ✗ return AVERROR_INVALIDDATA;
762 }
763
764 ✗ while (count-- && x_pos < s->width) {
765 ✗ const int bytes_per_vector = 4 * s->vector_height * sizeof(uint16_t);
766 ✗ unsigned char *src = s->codebook + vector_index * bytes_per_vector;
767 ✗ unsigned char *dst = s->frame->data[0] + y_pos * s->frame->linesize[0]
768 ✗ + sizeof(uint16_t) * x_pos;
769
770 ✗ if (vector_index >= MAX_VECTORS)
771 ✗ return AVERROR_INVALIDDATA;
772
773 ✗ for (int y = 0; y < s->vector_height; y++) {
774 ✗ int size = 4 * sizeof(uint16_t);
775 ✗ memcpy(dst, src, size);
776 ✗ dst += s->frame->linesize[0];
777 ✗ src += size;
778 }
779
780 /* we might want to read the next block index from stream */
781 ✗ if ((type == 2) && count > 0) {
782 ✗ vector_index = bytestream2_get_byte(&gb_stream);
783 }
784
785 ✗ x_pos += 4;
786 }
787
788 ✗ if (count > 0) {
789 ✗ av_log(s->avctx, AV_LOG_ERROR, "had %d leftover vectors\n", count);
790 ✗ return AVERROR_BUG;
791 }
792 }
793 }
794
795 ✗ return 0;
796 }
797
798 39 static int vqa_decode_frame(AVCodecContext *avctx, AVFrame *rframe,
799 int *got_frame, AVPacket *avpkt)
800 {
801 39 VqaContext *s = avctx->priv_data;
802 int res;
803
804
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 39 if ((res = ff_reget_buffer(avctx, s->frame, 0)) < 0)
805 ✗ return res;
806
807 39 bytestream2_init(&s->gb, avpkt->data, avpkt->size);
808
809
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 39 if (avctx->pix_fmt == AV_PIX_FMT_PAL8) {
810
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 39 if ((res = vqa_decode_frame_pal8(s, s->frame)) < 0)
811 1 return res;
812
813 /* make the palette available on the way out */
814 38 memcpy(s->frame->data[1], s->palette, PALETTE_COUNT * 4);
815 ✗ } else if (avctx->pix_fmt == AV_PIX_FMT_RGB555LE) {
816 ✗ if ((res = vqa_decode_frame_hicolor(s, s->frame)) < 0)
817 ✗ return res;
818 } else {
819 ✗ av_log(s->avctx, AV_LOG_ERROR, "unsupported pixel format\n");
820 ✗ return AVERROR_BUG;
821 }
822
823
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 38 if ((res = av_frame_ref(rframe, s->frame)) < 0)
824 ✗ return res;
825
826 38 *got_frame = 1;
827
828 /* report that the buffer was completely consumed */
829 38 return avpkt->size;
830 }
831
832 5 static av_cold int vqa_decode_end(AVCodecContext *avctx)
833 {
834 5 VqaContext *s = avctx->priv_data;
835
836 5 av_frame_free(&s->frame);
837 5 av_freep(&s->codebook);
838 5 av_freep(&s->next_codebook_buffer);
839 5 av_freep(&s->decode_buffer);
840
841 5 return 0;
842 }
843
844 static const FFCodecDefault vqa_defaults[] = {
845 { "max_pixels", "640*480" },
846 { NULL },
847 };
848
849 const FFCodec ff_vqa_decoder = {
850 .p.name = "vqavideo",
851 CODEC_LONG_NAME("Westwood Studios VQA (Vector Quantized Animation) video"),
852 .p.type = AVMEDIA_TYPE_VIDEO,
853 .p.id = AV_CODEC_ID_WS_VQA,
854 .priv_data_size = sizeof(VqaContext),
855 .init = vqa_decode_init,
856 .close = vqa_decode_end,
857 FF_CODEC_DECODE_CB(vqa_decode_frame),
858 .p.capabilities = AV_CODEC_CAP_DR1,
859 .defaults = vqa_defaults,
860 .caps_internal = FF_CODEC_CAP_INIT_CLEANUP,
861 };
862