libavcodec/vqavideo.c

   1 /*
   2  * Westwood Studios VQA Video Decoder
   3  * Copyright (C) 2003 the ffmpeg project
   4  *
   5  * This file is part of Libav.
   6  *
   7  * Libav 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  * Libav 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 Libav; 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     AVFrame frame;
  98     GetByteContext gb;
  99
 100     uint32_t palette[PALETTE_COUNT];
 101
 102     int width;   /* width of a frame */
 103     int height;   /* height of a frame */
 104     int vector_width;  /* width of individual vector */
 105     int vector_height;  /* height of individual vector */
 106     int vqa_version;  /* this should be either 1, 2 or 3 */
 107
 108     unsigned char *codebook;         /* the current codebook */
 109     int codebook_size;
 110     unsigned char *next_codebook_buffer;  /* accumulator for next codebook */
 111     int next_codebook_buffer_index;
 112
 113     unsigned char *decode_buffer;
 114     int decode_buffer_size;
 115
 116     /* number of frames to go before replacing codebook */
 117     int partial_countdown;
 118     int partial_count;
 119
 120 } VqaContext;
 121
 122 static av_cold int vqa_decode_init(AVCodecContext *avctx)
 123 {
 124     VqaContext *s = avctx->priv_data;
 125     int i, j, codebook_index, ret;
 126
 127     s->avctx = avctx;
 128     avctx->pix_fmt = AV_PIX_FMT_PAL8;
 129
 130     /* make sure the extradata made it */
 131     if (s->avctx->extradata_size != VQA_HEADER_SIZE) {
 132         av_log(s->avctx, AV_LOG_ERROR, "  VQA video: expected extradata size of %d\n", VQA_HEADER_SIZE);
 133         return AVERROR(EINVAL);
 134     }
 135
 136     /* load up the VQA parameters from the header */
 137     s->vqa_version = s->avctx->extradata[0];
 138     s->width = AV_RL16(&s->avctx->extradata[6]);
 139     s->height = AV_RL16(&s->avctx->extradata[8]);
 140     if ((ret = av_image_check_size(s->width, s->height, 0, avctx)) < 0) {
 141         s->width= s->height= 0;
 142         return ret;
 143     }
 144     s->vector_width = s->avctx->extradata[10];
 145     s->vector_height = s->avctx->extradata[11];
 146     s->partial_count = s->partial_countdown = s->avctx->extradata[13];
 147
 148     /* the vector dimensions have to meet very stringent requirements */
 149     if ((s->vector_width != 4) ||
 150         ((s->vector_height != 2) && (s->vector_height != 4))) {
 151         /* return without further initialization */
 152         return AVERROR_INVALIDDATA;
 153     }
 154
 155     if (s->width  & (s->vector_width  - 1) ||
 156         s->height & (s->vector_height - 1)) {
 157         av_log(avctx, AV_LOG_ERROR, "Image size not multiple of block size\n");
 158         return AVERROR_INVALIDDATA;
 159     }
 160
 161     /* allocate codebooks */
 162     s->codebook_size = MAX_CODEBOOK_SIZE;
 163     s->codebook = av_malloc(s->codebook_size);
 164     if (!s->codebook)
 165         goto fail;
 166     s->next_codebook_buffer = av_malloc(s->codebook_size);
 167     if (!s->next_codebook_buffer)
 168         goto fail;
 169
 170     /* allocate decode buffer */
 171     s->decode_buffer_size = (s->width / s->vector_width) *
 172         (s->height / s->vector_height) * 2;
 173     s->decode_buffer = av_malloc(s->decode_buffer_size);
 174     if (!s->decode_buffer)
 175         goto fail;
 176
 177     /* initialize the solid-color vectors */
 178     if (s->vector_height == 4) {
 179         codebook_index = 0xFF00 * 16;
 180         for (i = 0; i < 256; i++)
 181             for (j = 0; j < 16; j++)
 182                 s->codebook[codebook_index++] = i;
 183     } else {
 184         codebook_index = 0xF00 * 8;
 185         for (i = 0; i < 256; i++)
 186             for (j = 0; j < 8; j++)
 187                 s->codebook[codebook_index++] = i;
 188     }
 189     s->next_codebook_buffer_index = 0;
 190
 191     s->frame.data[0] = NULL;
 192
 193     return 0;
 194 fail:
 195     av_freep(&s->codebook);
 196     av_freep(&s->next_codebook_buffer);
 197     av_freep(&s->decode_buffer);
 198     return AVERROR(ENOMEM);
 199 }
 200
 201 #define CHECK_COUNT() \
 202     if (dest_index + count > dest_size) { \
 203         av_log(NULL, AV_LOG_ERROR, "  VQA video: decode_format80 problem: next op would overflow dest_index\n"); \
 204         av_log(NULL, AV_LOG_ERROR, "  VQA video: current dest_index = %d, count = %d, dest_size = %d\n", \
 205             dest_index, count, dest_size); \
 206         return AVERROR_INVALIDDATA; \
 207     }
 208
 209 #define CHECK_COPY(idx) \
 210     if (idx < 0 || idx + count > dest_size) { \
 211         av_log(NULL, AV_LOG_ERROR, "  VQA video: decode_format80 problem: next op would overflow dest_index\n"); \
 212         av_log(NULL, AV_LOG_ERROR, "  VQA video: current src_pos = %d, count = %d, dest_size = %d\n", \
 213             src_pos, count, dest_size); \
 214         return AVERROR_INVALIDDATA; \
 215     }
 216
 217
 218 static int decode_format80(GetByteContext *gb, int src_size,
 219     unsigned char *dest, int dest_size, int check_size) {
 220
 221     int dest_index = 0;
 222     int count, opcode, start;
 223     int src_pos;
 224     unsigned char color;
 225     int i;
 226
 227     start = bytestream2_tell(gb);
 228     while (bytestream2_tell(gb) - start < src_size) {
 229         opcode = bytestream2_get_byte(gb);
 230         av_dlog(NULL, "      opcode %02X: ", opcode);
 231
 232         /* 0x80 means that frame is finished */
 233         if (opcode == 0x80)
 234             return 0;
 235
 236         if (dest_index >= dest_size) {
 237             av_log(NULL, AV_LOG_ERROR, "  VQA video: decode_format80 problem: dest_index (%d) exceeded dest_size (%d)\n",
 238                 dest_index, dest_size);
 239             return AVERROR_INVALIDDATA;
 240         }
 241
 242         if (opcode == 0xFF) {
 243
 244             count   = bytestream2_get_le16(gb);
 245             src_pos = bytestream2_get_le16(gb);
 246             av_dlog(NULL, "(1) copy %X bytes from absolute pos %X\n", count, src_pos);
 247             CHECK_COUNT();
 248             CHECK_COPY(src_pos);
 249             for (i = 0; i < count; i++)
 250                 dest[dest_index + i] = dest[src_pos + i];
 251             dest_index += count;
 252
 253         } else if (opcode == 0xFE) {
 254
 255             count = bytestream2_get_le16(gb);
 256             color = bytestream2_get_byte(gb);
 257             av_dlog(NULL, "(2) set %X bytes to %02X\n", count, color);
 258             CHECK_COUNT();
 259             memset(&dest[dest_index], color, count);
 260             dest_index += count;
 261
 262         } else if ((opcode & 0xC0) == 0xC0) {
 263
 264             count = (opcode & 0x3F) + 3;
 265             src_pos = bytestream2_get_le16(gb);
 266             av_dlog(NULL, "(3) copy %X bytes from absolute pos %X\n", count, src_pos);
 267             CHECK_COUNT();
 268             CHECK_COPY(src_pos);
 269             for (i = 0; i < count; i++)
 270                 dest[dest_index + i] = dest[src_pos + i];
 271             dest_index += count;
 272
 273         } else if (opcode > 0x80) {
 274
 275             count = opcode & 0x3F;
 276             av_dlog(NULL, "(4) copy %X bytes from source to dest\n", count);
 277             CHECK_COUNT();
 278             bytestream2_get_buffer(gb, &dest[dest_index], count);
 279             dest_index += count;
 280
 281         } else {
 282
 283             count = ((opcode & 0x70) >> 4) + 3;
 284             src_pos = bytestream2_get_byte(gb) | ((opcode & 0x0F) << 8);
 285             av_dlog(NULL, "(5) copy %X bytes from relpos %X\n", count, src_pos);
 286             CHECK_COUNT();
 287             CHECK_COPY(dest_index - src_pos);
 288             for (i = 0; i < count; i++)
 289                 dest[dest_index + i] = dest[dest_index - src_pos + i];
 290             dest_index += count;
 291         }
 292     }
 293
 294     /* validate that the entire destination buffer was filled; this is
 295      * important for decoding frame maps since each vector needs to have a
 296      * codebook entry; it is not important for compressed codebooks because
 297      * not every entry needs to be filled */
 298     if (check_size)
 299         if (dest_index < dest_size)
 300             av_log(NULL, AV_LOG_ERROR, "  VQA video: decode_format80 problem: decode finished with dest_index (%d) < dest_size (%d)\n",
 301                 dest_index, dest_size);
 302
 303     return 0; // let's display what we decoded anyway
 304 }
 305
 306 static int vqa_decode_chunk(VqaContext *s)
 307 {
 308     unsigned int chunk_type;
 309     unsigned int chunk_size;
 310     int byte_skip;
 311     unsigned int index = 0;
 312     int i;
 313     unsigned char r, g, b;
 314     int index_shift;
 315     int res;
 316
 317     int cbf0_chunk = -1;
 318     int cbfz_chunk = -1;
 319     int cbp0_chunk = -1;
 320     int cbpz_chunk = -1;
 321     int cpl0_chunk = -1;
 322     int cplz_chunk = -1;
 323     int vptz_chunk = -1;
 324
 325     int x, y;
 326     int lines = 0;
 327     int pixel_ptr;
 328     int vector_index = 0;
 329     int lobyte = 0;
 330     int hibyte = 0;
 331     int lobytes = 0;
 332     int hibytes = s->decode_buffer_size / 2;
 333
 334     /* first, traverse through the frame and find the subchunks */
 335     while (bytestream2_get_bytes_left(&s->gb) >= 8) {
 336
 337         chunk_type = bytestream2_get_be32u(&s->gb);
 338         index      = bytestream2_tell(&s->gb);
 339         chunk_size = bytestream2_get_be32u(&s->gb);
 340
 341         switch (chunk_type) {
 342
 343         case CBF0_TAG:
 344             cbf0_chunk = index;
 345             break;
 346
 347         case CBFZ_TAG:
 348             cbfz_chunk = index;
 349             break;
 350
 351         case CBP0_TAG:
 352             cbp0_chunk = index;
 353             break;
 354
 355         case CBPZ_TAG:
 356             cbpz_chunk = index;
 357             break;
 358
 359         case CPL0_TAG:
 360             cpl0_chunk = index;
 361             break;
 362
 363         case CPLZ_TAG:
 364             cplz_chunk = index;
 365             break;
 366
 367         case VPTZ_TAG:
 368             vptz_chunk = index;
 369             break;
 370
 371         default:
 372             av_log(s->avctx, AV_LOG_ERROR, "  VQA video: Found unknown chunk type: %c%c%c%c (%08X)\n",
 373             (chunk_type >> 24) & 0xFF,
 374             (chunk_type >> 16) & 0xFF,
 375             (chunk_type >>  8) & 0xFF,
 376             (chunk_type >>  0) & 0xFF,
 377             chunk_type);
 378             break;
 379         }
 380
 381         byte_skip = chunk_size & 0x01;
 382         bytestream2_skip(&s->gb, chunk_size + byte_skip);
 383     }
 384
 385     /* next, deal with the palette */
 386     if ((cpl0_chunk != -1) && (cplz_chunk != -1)) {
 387
 388         /* a chunk should not have both chunk types */
 389         av_log(s->avctx, AV_LOG_ERROR, "  VQA video: problem: found both CPL0 and CPLZ chunks\n");
 390         return AVERROR_INVALIDDATA;
 391     }
 392
 393     /* decompress the palette chunk */
 394     if (cplz_chunk != -1) {
 395
 396 /* yet to be handled */
 397
 398     }
 399
 400     /* convert the RGB palette into the machine's endian format */
 401     if (cpl0_chunk != -1) {
 402
 403         bytestream2_seek(&s->gb, cpl0_chunk, SEEK_SET);
 404         chunk_size = bytestream2_get_be32(&s->gb);
 405         /* sanity check the palette size */
 406         if (chunk_size / 3 > 256 || chunk_size > bytestream2_get_bytes_left(&s->gb)) {
 407             av_log(s->avctx, AV_LOG_ERROR, "  VQA video: problem: found a palette chunk with %d colors\n",
 408                 chunk_size / 3);
 409             return AVERROR_INVALIDDATA;
 410         }
 411         for (i = 0; i < chunk_size / 3; i++) {
 412             /* scale by 4 to transform 6-bit palette -> 8-bit */
 413             r = bytestream2_get_byteu(&s->gb) * 4;
 414             g = bytestream2_get_byteu(&s->gb) * 4;
 415             b = bytestream2_get_byteu(&s->gb) * 4;
 416             s->palette[i] = (r << 16) | (g << 8) | (b);
 417         }
 418     }
 419
 420     /* next, look for a full codebook */
 421     if ((cbf0_chunk != -1) && (cbfz_chunk != -1)) {
 422
 423         /* a chunk should not have both chunk types */
 424         av_log(s->avctx, AV_LOG_ERROR, "  VQA video: problem: found both CBF0 and CBFZ chunks\n");
 425         return AVERROR_INVALIDDATA;
 426     }
 427
 428     /* decompress the full codebook chunk */
 429     if (cbfz_chunk != -1) {
 430
 431         bytestream2_seek(&s->gb, cbfz_chunk, SEEK_SET);
 432         chunk_size = bytestream2_get_be32(&s->gb);
 433         if ((res = decode_format80(&s->gb, chunk_size, s->codebook,
 434                                    s->codebook_size, 0)) < 0)
 435             return res;
 436     }
 437
 438     /* copy a full codebook */
 439     if (cbf0_chunk != -1) {
 440
 441         bytestream2_seek(&s->gb, cbf0_chunk, SEEK_SET);
 442         chunk_size = bytestream2_get_be32(&s->gb);
 443         /* sanity check the full codebook size */
 444         if (chunk_size > MAX_CODEBOOK_SIZE) {
 445             av_log(s->avctx, AV_LOG_ERROR, "  VQA video: problem: CBF0 chunk too large (0x%X bytes)\n",
 446                 chunk_size);
 447             return AVERROR_INVALIDDATA;
 448         }
 449
 450         bytestream2_get_buffer(&s->gb, s->codebook, chunk_size);
 451     }
 452
 453     /* decode the frame */
 454     if (vptz_chunk == -1) {
 455
 456         /* something is wrong if there is no VPTZ chunk */
 457         av_log(s->avctx, AV_LOG_ERROR, "  VQA video: problem: no VPTZ chunk found\n");
 458         return AVERROR_INVALIDDATA;
 459     }
 460
 461     bytestream2_seek(&s->gb, vptz_chunk, SEEK_SET);
 462     chunk_size = bytestream2_get_be32(&s->gb);
 463     if ((res = decode_format80(&s->gb, chunk_size,
 464                                s->decode_buffer, s->decode_buffer_size, 1)) < 0)
 465         return res;
 466
 467     /* render the final PAL8 frame */
 468     if (s->vector_height == 4)
 469         index_shift = 4;
 470     else
 471         index_shift = 3;
 472     for (y = 0; y < s->height; y += s->vector_height) {
 473         for (x = 0; x < s->width; x += 4, lobytes++, hibytes++) {
 474             pixel_ptr = y * s->frame.linesize[0] + x;
 475
 476             /* get the vector index, the method for which varies according to
 477              * VQA file version */
 478             switch (s->vqa_version) {
 479
 480             case 1:
 481                 lobyte = s->decode_buffer[lobytes * 2];
 482                 hibyte = s->decode_buffer[(lobytes * 2) + 1];
 483                 vector_index = ((hibyte << 8) | lobyte) >> 3;
 484                 vector_index <<= index_shift;
 485                 lines = s->vector_height;
 486                 /* uniform color fill - a quick hack */
 487                 if (hibyte == 0xFF) {
 488                     while (lines--) {
 489                         s->frame.data[0][pixel_ptr + 0] = 255 - lobyte;
 490                         s->frame.data[0][pixel_ptr + 1] = 255 - lobyte;
 491                         s->frame.data[0][pixel_ptr + 2] = 255 - lobyte;
 492                         s->frame.data[0][pixel_ptr + 3] = 255 - lobyte;
 493                         pixel_ptr += s->frame.linesize[0];
 494                     }
 495                     lines=0;
 496                 }
 497                 break;
 498
 499             case 2:
 500                 lobyte = s->decode_buffer[lobytes];
 501                 hibyte = s->decode_buffer[hibytes];
 502                 vector_index = (hibyte << 8) | lobyte;
 503                 vector_index <<= index_shift;
 504                 lines = s->vector_height;
 505                 break;
 506
 507             case 3:
 508 /* not implemented yet */
 509                 lines = 0;
 510                 break;
 511             }
 512
 513             while (lines--) {
 514                 s->frame.data[0][pixel_ptr + 0] = s->codebook[vector_index++];
 515                 s->frame.data[0][pixel_ptr + 1] = s->codebook[vector_index++];
 516                 s->frame.data[0][pixel_ptr + 2] = s->codebook[vector_index++];
 517                 s->frame.data[0][pixel_ptr + 3] = s->codebook[vector_index++];
 518                 pixel_ptr += s->frame.linesize[0];
 519             }
 520         }
 521     }
 522
 523     /* handle partial codebook */
 524     if ((cbp0_chunk != -1) && (cbpz_chunk != -1)) {
 525         /* a chunk should not have both chunk types */
 526         av_log(s->avctx, AV_LOG_ERROR, "  VQA video: problem: found both CBP0 and CBPZ chunks\n");
 527         return AVERROR_INVALIDDATA;
 528     }
 529
 530     if (cbp0_chunk != -1) {
 531
 532         bytestream2_seek(&s->gb, cbp0_chunk, SEEK_SET);
 533         chunk_size = bytestream2_get_be32(&s->gb);
 534
 535         /* accumulate partial codebook */
 536         bytestream2_get_buffer(&s->gb, &s->next_codebook_buffer[s->next_codebook_buffer_index],
 537                                chunk_size);
 538         s->next_codebook_buffer_index += chunk_size;
 539
 540         s->partial_countdown--;
 541         if (s->partial_countdown == 0) {
 542
 543             /* time to replace codebook */
 544             memcpy(s->codebook, s->next_codebook_buffer,
 545                 s->next_codebook_buffer_index);
 546
 547             /* reset accounting */
 548             s->next_codebook_buffer_index = 0;
 549             s->partial_countdown = s->partial_count;
 550         }
 551     }
 552
 553     if (cbpz_chunk != -1) {
 554
 555         bytestream2_seek(&s->gb, cbpz_chunk, SEEK_SET);
 556         chunk_size = bytestream2_get_be32(&s->gb);
 557
 558         /* accumulate partial codebook */
 559         bytestream2_get_buffer(&s->gb, &s->next_codebook_buffer[s->next_codebook_buffer_index],
 560                                chunk_size);
 561         s->next_codebook_buffer_index += chunk_size;
 562
 563         s->partial_countdown--;
 564         if (s->partial_countdown == 0) {
 565             GetByteContext gb;
 566
 567             bytestream2_init(&gb, s->next_codebook_buffer, s->next_codebook_buffer_index);
 568             /* decompress codebook */
 569             if ((res = decode_format80(&gb, s->next_codebook_buffer_index,
 570                                        s->codebook, s->codebook_size, 0)) < 0)
 571                 return res;
 572
 573             /* reset accounting */
 574             s->next_codebook_buffer_index = 0;
 575             s->partial_countdown = s->partial_count;
 576         }
 577     }
 578
 579     return 0;
 580 }
 581
 582 static int vqa_decode_frame(AVCodecContext *avctx,
 583                             void *data, int *got_frame,
 584                             AVPacket *avpkt)
 585 {
 586     VqaContext *s = avctx->priv_data;
 587     int res;
 588
 589     if (s->frame.data[0])
 590         avctx->release_buffer(avctx, &s->frame);
 591
 592     if ((res = ff_get_buffer(avctx, &s->frame)) < 0) {
 593         av_log(s->avctx, AV_LOG_ERROR, "  VQA Video: get_buffer() failed\n");
 594         return res;
 595     }
 596
 597     bytestream2_init(&s->gb, avpkt->data, avpkt->size);
 598     if ((res = vqa_decode_chunk(s)) < 0)
 599         return res;
 600
 601     /* make the palette available on the way out */
 602     memcpy(s->frame.data[1], s->palette, PALETTE_COUNT * 4);
 603     s->frame.palette_has_changed = 1;
 604
 605     *got_frame      = 1;
 606     *(AVFrame*)data = s->frame;
 607
 608     /* report that the buffer was completely consumed */
 609     return avpkt->size;
 610 }
 611
 612 static av_cold int vqa_decode_end(AVCodecContext *avctx)
 613 {
 614     VqaContext *s = avctx->priv_data;
 615
 616     av_freep(&s->codebook);
 617     av_freep(&s->next_codebook_buffer);
 618     av_freep(&s->decode_buffer);
 619
 620     if (s->frame.data[0])
 621         avctx->release_buffer(avctx, &s->frame);
 622
 623     return 0;
 624 }
 625
 626 AVCodec ff_vqa_decoder = {
 627     .name           = "vqavideo",
 628     .type           = AVMEDIA_TYPE_VIDEO,
 629     .id             = AV_CODEC_ID_WS_VQA,
 630     .priv_data_size = sizeof(VqaContext),
 631     .init           = vqa_decode_init,
 632     .close          = vqa_decode_end,
 633     .decode         = vqa_decode_frame,
 634     .capabilities   = CODEC_CAP_DR1,
 635     .long_name      = NULL_IF_CONFIG_SMALL("Westwood Studios VQA (Vector Quantized Animation) video"),
 636 };