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vqavideo.c
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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 
98 
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 */
109  unsigned char *next_codebook_buffer; /* accumulator for next codebook */
111 
112  unsigned char *decode_buffer;
114 
115  /* number of frames to go before replacing codebook */
118 
119 } VqaContext;
120 
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];
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 */
173  if (!s->codebook)
174  goto fail;
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;
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  }
199 
200  return 0;
201 fail:
202  av_freep(&s->codebook);
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 
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: %c%c%c%c (%08X)\n",
388  (chunk_type >> 24) & 0xFF,
389  (chunk_type >> 16) & 0xFF,
390  (chunk_type >> 8) & 0xFF,
391  (chunk_type >> 0) & 0xFF,
392  chunk_type);
393  break;
394  }
395 
396  byte_skip = chunk_size & 0x01;
397  bytestream2_skip(&s->gb, chunk_size + byte_skip);
398  }
399 
400  /* next, deal with the palette */
401  if ((cpl0_chunk != -1) && (cplz_chunk != -1)) {
402 
403  /* a chunk should not have both chunk types */
404  av_log(s->avctx, AV_LOG_ERROR, "problem: found both CPL0 and CPLZ chunks\n");
405  return AVERROR_INVALIDDATA;
406  }
407 
408  /* decompress the palette chunk */
409  if (cplz_chunk != -1) {
410 
411 /* yet to be handled */
412 
413  }
414 
415  /* convert the RGB palette into the machine's endian format */
416  if (cpl0_chunk != -1) {
417 
418  bytestream2_seek(&s->gb, cpl0_chunk, SEEK_SET);
419  chunk_size = bytestream2_get_be32(&s->gb);
420  /* sanity check the palette size */
421  if (chunk_size / 3 > 256 || chunk_size > bytestream2_get_bytes_left(&s->gb)) {
422  av_log(s->avctx, AV_LOG_ERROR, "problem: found a palette chunk with %d colors\n",
423  chunk_size / 3);
424  return AVERROR_INVALIDDATA;
425  }
426  for (i = 0; i < chunk_size / 3; i++) {
427  /* scale by 4 to transform 6-bit palette -> 8-bit */
428  r = bytestream2_get_byteu(&s->gb) * 4;
429  g = bytestream2_get_byteu(&s->gb) * 4;
430  b = bytestream2_get_byteu(&s->gb) * 4;
431  s->palette[i] = 0xFFU << 24 | r << 16 | g << 8 | b;
432  s->palette[i] |= s->palette[i] >> 6 & 0x30303;
433  }
434  }
435 
436  /* next, look for a full codebook */
437  if ((cbf0_chunk != -1) && (cbfz_chunk != -1)) {
438 
439  /* a chunk should not have both chunk types */
440  av_log(s->avctx, AV_LOG_ERROR, "problem: found both CBF0 and CBFZ chunks\n");
441  return AVERROR_INVALIDDATA;
442  }
443 
444  /* decompress the full codebook chunk */
445  if (cbfz_chunk != -1) {
446 
447  bytestream2_seek(&s->gb, cbfz_chunk, SEEK_SET);
448  chunk_size = bytestream2_get_be32(&s->gb);
449  if ((res = decode_format80(s, chunk_size, s->codebook,
450  s->codebook_size, 0)) < 0)
451  return res;
452  }
453 
454  /* copy a full codebook */
455  if (cbf0_chunk != -1) {
456 
457  bytestream2_seek(&s->gb, cbf0_chunk, SEEK_SET);
458  chunk_size = bytestream2_get_be32(&s->gb);
459  /* sanity check the full codebook size */
460  if (chunk_size > MAX_CODEBOOK_SIZE) {
461  av_log(s->avctx, AV_LOG_ERROR, "problem: CBF0 chunk too large (0x%X bytes)\n",
462  chunk_size);
463  return AVERROR_INVALIDDATA;
464  }
465 
466  bytestream2_get_buffer(&s->gb, s->codebook, chunk_size);
467  }
468 
469  /* decode the frame */
470  if (vptz_chunk == -1) {
471 
472  /* something is wrong if there is no VPTZ chunk */
473  av_log(s->avctx, AV_LOG_ERROR, "problem: no VPTZ chunk found\n");
474  return AVERROR_INVALIDDATA;
475  }
476 
477  bytestream2_seek(&s->gb, vptz_chunk, SEEK_SET);
478  chunk_size = bytestream2_get_be32(&s->gb);
479  if ((res = decode_format80(s, chunk_size,
480  s->decode_buffer, s->decode_buffer_size, 1)) < 0)
481  return res;
482 
483  /* render the final PAL8 frame */
484  if (s->vector_height == 4)
485  index_shift = 4;
486  else
487  index_shift = 3;
488  for (y = 0; y < s->height; y += s->vector_height) {
489  for (x = 0; x < s->width; x += 4, lobytes++, hibytes++) {
490  pixel_ptr = y * frame->linesize[0] + x;
491 
492  /* get the vector index, the method for which varies according to
493  * VQA file version */
494  switch (s->vqa_version) {
495 
496  case 1:
497  lobyte = s->decode_buffer[lobytes * 2];
498  hibyte = s->decode_buffer[(lobytes * 2) + 1];
499  vector_index = ((hibyte << 8) | lobyte) >> 3;
500  vector_index <<= index_shift;
501  lines = s->vector_height;
502  /* uniform color fill - a quick hack */
503  if (hibyte == 0xFF) {
504  while (lines--) {
505  frame->data[0][pixel_ptr + 0] = 255 - lobyte;
506  frame->data[0][pixel_ptr + 1] = 255 - lobyte;
507  frame->data[0][pixel_ptr + 2] = 255 - lobyte;
508  frame->data[0][pixel_ptr + 3] = 255 - lobyte;
509  pixel_ptr += frame->linesize[0];
510  }
511  lines=0;
512  }
513  break;
514 
515  case 2:
516  lobyte = s->decode_buffer[lobytes];
517  hibyte = s->decode_buffer[hibytes];
518  vector_index = (hibyte << 8) | lobyte;
519  vector_index <<= index_shift;
520  lines = s->vector_height;
521  break;
522 
523  case 3:
524 /* not implemented yet */
525  lines = 0;
526  break;
527  }
528 
529  while (lines--) {
530  frame->data[0][pixel_ptr + 0] = s->codebook[vector_index++];
531  frame->data[0][pixel_ptr + 1] = s->codebook[vector_index++];
532  frame->data[0][pixel_ptr + 2] = s->codebook[vector_index++];
533  frame->data[0][pixel_ptr + 3] = s->codebook[vector_index++];
534  pixel_ptr += frame->linesize[0];
535  }
536  }
537  }
538 
539  /* handle partial codebook */
540  if ((cbp0_chunk != -1) && (cbpz_chunk != -1)) {
541  /* a chunk should not have both chunk types */
542  av_log(s->avctx, AV_LOG_ERROR, "problem: found both CBP0 and CBPZ chunks\n");
543  return AVERROR_INVALIDDATA;
544  }
545 
546  if (cbp0_chunk != -1) {
547 
548  bytestream2_seek(&s->gb, cbp0_chunk, SEEK_SET);
549  chunk_size = bytestream2_get_be32(&s->gb);
550 
551  if (chunk_size > MAX_CODEBOOK_SIZE - s->next_codebook_buffer_index) {
552  av_log(s->avctx, AV_LOG_ERROR, "cbp0 chunk too large (%u bytes)\n",
553  chunk_size);
554  return AVERROR_INVALIDDATA;
555  }
556 
557  /* accumulate partial codebook */
559  chunk_size);
560  s->next_codebook_buffer_index += chunk_size;
561 
562  s->partial_countdown--;
563  if (s->partial_countdown <= 0) {
564 
565  /* time to replace codebook */
566  memcpy(s->codebook, s->next_codebook_buffer,
568 
569  /* reset accounting */
572  }
573  }
574 
575  if (cbpz_chunk != -1) {
576 
577  bytestream2_seek(&s->gb, cbpz_chunk, SEEK_SET);
578  chunk_size = bytestream2_get_be32(&s->gb);
579 
580  if (chunk_size > MAX_CODEBOOK_SIZE - s->next_codebook_buffer_index) {
581  av_log(s->avctx, AV_LOG_ERROR, "cbpz chunk too large (%u bytes)\n",
582  chunk_size);
583  return AVERROR_INVALIDDATA;
584  }
585 
586  /* accumulate partial codebook */
588  chunk_size);
589  s->next_codebook_buffer_index += chunk_size;
590 
591  s->partial_countdown--;
592  if (s->partial_countdown <= 0) {
594  /* decompress codebook */
596  s->codebook, s->codebook_size, 0)) < 0)
597  return res;
598 
599  /* reset accounting */
602  }
603  }
604 
605  return 0;
606 }
607 
609  void *data, int *got_frame,
610  AVPacket *avpkt)
611 {
612  VqaContext *s = avctx->priv_data;
613  AVFrame *frame = data;
614  int res;
615 
616  if ((res = ff_get_buffer(avctx, frame, 0)) < 0)
617  return res;
618 
619  bytestream2_init(&s->gb, avpkt->data, avpkt->size);
620  if ((res = vqa_decode_chunk(s, frame)) < 0)
621  return res;
622 
623  /* make the palette available on the way out */
624  memcpy(frame->data[1], s->palette, PALETTE_COUNT * 4);
625  frame->palette_has_changed = 1;
626 
627  *got_frame = 1;
628 
629  /* report that the buffer was completely consumed */
630  return avpkt->size;
631 }
632 
634 {
635  VqaContext *s = avctx->priv_data;
636 
637  av_freep(&s->codebook);
639  av_freep(&s->decode_buffer);
640 
641  return 0;
642 }
643 
645  .name = "vqavideo",
646  .long_name = NULL_IF_CONFIG_SMALL("Westwood Studios VQA (Vector Quantized Animation) video"),
647  .type = AVMEDIA_TYPE_VIDEO,
648  .id = AV_CODEC_ID_WS_VQA,
649  .priv_data_size = sizeof(VqaContext),
651  .close = vqa_decode_end,
653  .capabilities = AV_CODEC_CAP_DR1,
654 };
#define ff_tlog(ctx,...)
Definition: internal.h:65
const char * s
Definition: avisynth_c.h:768
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition: error.h:59
#define CPLZ_TAG
Definition: vqavideo.c:91
static int vqa_decode_chunk(VqaContext *s, AVFrame *frame)
Definition: vqavideo.c:321
This structure describes decoded (raw) audio or video data.
Definition: frame.h:184
ptrdiff_t const GLvoid * data
Definition: opengl_enc.c:101
#define VQA_HEADER_SIZE
Definition: vqavideo.c:77
static int check_size(TiffEncoderContext *s, uint64_t need)
Check free space in buffer.
Definition: tiffenc.c:87
misc image utilities
#define CBP0_TAG
Definition: vqavideo.c:88
const char * g
Definition: vf_curves.c:112
static av_cold int init(AVCodecContext *avctx)
Definition: avrndec.c:35
int size
Definition: avcodec.h:1601
const char * b
Definition: vf_curves.c:113
enum AVPixelFormat pix_fmt
Pixel format, see AV_PIX_FMT_xxx.
Definition: avcodec.h:1903
static av_always_inline void bytestream2_init(GetByteContext *g, const uint8_t *buf, int buf_size)
Definition: bytestream.h:133
int next_codebook_buffer_index
Definition: vqavideo.c:110
static int decode_format80(VqaContext *s, int src_size, unsigned char *dest, int dest_size, int check_size)
Definition: vqavideo.c:225
void * av_mallocz(size_t size)
Allocate a memory block with alignment suitable for all memory accesses (including vectors if availab...
Definition: mem.c:252
AVCodec.
Definition: avcodec.h:3589
uint64_t_TMPL AV_WL64 unsigned int_TMPL AV_WL32 unsigned int_TMPL AV_WL24 unsigned int_TMPL AV_RL16
Definition: bytestream.h:87
void void avpriv_request_sample(void *avc, const char *msg,...) av_printf_format(2
Log a generic warning message about a missing feature.
#define av_cold
Definition: attributes.h:82
#define av_malloc(s)
#define CHECK_COUNT()
Definition: vqavideo.c:208
int vector_width
Definition: vqavideo.c:103
8 bits with AV_PIX_FMT_RGB32 palette
Definition: pixfmt.h:73
unsigned char * decode_buffer
Definition: vqavideo.c:112
static const uint32_t color[16+AV_CLASS_CATEGORY_NB]
Definition: log.c:94
int vqa_version
Definition: vqavideo.c:105
uint8_t * extradata
some codecs need / can use extradata like Huffman tables.
Definition: avcodec.h:1790
static AVFrame * frame
int width
Definition: vqavideo.c:101
uint8_t * data
Definition: avcodec.h:1600
#define CPL0_TAG
Definition: vqavideo.c:90
#define av_log(a,...)
#define U(x)
Definition: vp56_arith.h:37
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:176
int vector_height
Definition: vqavideo.c:104
#define AVERROR(e)
Definition: error.h:43
static av_always_inline void bytestream2_skip(GetByteContext *g, unsigned int size)
Definition: bytestream.h:164
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition: internal.h:176
const char * r
Definition: vf_curves.c:111
static av_always_inline unsigned int bytestream2_get_buffer(GetByteContext *g, uint8_t *dst, unsigned int size)
Definition: bytestream.h:263
static av_always_inline unsigned int bytestream2_get_bytes_left(GetByteContext *g)
Definition: bytestream.h:154
#define CBF0_TAG
Definition: vqavideo.c:86
const char * name
Name of the codec implementation.
Definition: avcodec.h:3596
unsigned char * codebook
Definition: vqavideo.c:107
GLsizei count
Definition: opengl_enc.c:109
#define fail()
Definition: checkasm.h:82
#define CBPZ_TAG
Definition: vqavideo.c:89
int av_image_check_size(unsigned int w, unsigned int h, int log_offset, void *log_ctx)
Check if the given dimension of an image is valid, meaning that all bytes of the image can be address...
Definition: imgutils.c:251
#define CBFZ_TAG
Definition: vqavideo.c:87
#define PALETTE_COUNT
Definition: vqavideo.c:76
#define AVERROR_PATCHWELCOME
Not yet implemented in FFmpeg, patches welcome.
Definition: error.h:62
static av_always_inline int bytestream2_tell(GetByteContext *g)
Definition: bytestream.h:188
uint32_t palette[PALETTE_COUNT]
Definition: vqavideo.c:99
Libavcodec external API header.
GetByteContext gb
Definition: vqavideo.c:97
int linesize[AV_NUM_DATA_POINTERS]
For video, size in bytes of each picture line.
Definition: frame.h:215
main external API structure.
Definition: avcodec.h:1675
int partial_count
Definition: vqavideo.c:117
int ff_get_buffer(AVCodecContext *avctx, AVFrame *frame, int flags)
Get a buffer for a frame.
Definition: utils.c:934
int extradata_size
Definition: avcodec.h:1791
int index
Definition: gxfenc.c:89
int palette_has_changed
Tell user application that palette has changed from previous frame.
Definition: frame.h:328
int codebook_size
Definition: vqavideo.c:108
#define MAX_CODEBOOK_SIZE
Definition: vqavideo.c:84
int height
Definition: vqavideo.c:102
void avpriv_report_missing_feature(void *avc, const char *msg,...) av_printf_format(2
Log a generic warning message about a missing feature.
uint8_t * data[AV_NUM_DATA_POINTERS]
pointer to the picture/channel planes.
Definition: frame.h:198
AVCodec ff_vqa_decoder
Definition: vqavideo.c:644
static int decode(AVCodecContext *avctx, void *data, int *got_sub, AVPacket *avpkt)
Definition: ccaption_dec.c:750
int decode_buffer_size
Definition: vqavideo.c:113
#define CHECK_COPY(idx)
Definition: vqavideo.c:216
common internal api header.
static av_cold int vqa_decode_end(AVCodecContext *avctx)
Definition: vqavideo.c:633
static int vqa_decode_frame(AVCodecContext *avctx, void *data, int *got_frame, AVPacket *avpkt)
Definition: vqavideo.c:608
int partial_countdown
Definition: vqavideo.c:116
void * priv_data
Definition: avcodec.h:1717
static av_cold int vqa_decode_init(AVCodecContext *avctx)
Definition: vqavideo.c:121
unsigned char * next_codebook_buffer
Definition: vqavideo.c:109
static av_always_inline int bytestream2_seek(GetByteContext *g, int offset, int whence)
Definition: bytestream.h:208
#define VPTZ_TAG
Definition: vqavideo.c:92
#define av_freep(p)
void INT64 start
Definition: avisynth_c.h:690
AVCodecContext * avctx
Definition: vqavideo.c:96
This structure stores compressed data.
Definition: avcodec.h:1577
#define AV_CODEC_CAP_DR1
Codec uses get_buffer() for allocating buffers and supports custom allocators.
Definition: avcodec.h:958