libavcodec/vqavideo.c

   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 libavcodec/vqavideo.c
  24  * VQA Video Decoder by Mike Melanson (melanson@pcisys.net)
  25  * For more information about the VQA format, visit:
  26  *   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 "avcodec.h"
  72
  73 #define PALETTE_COUNT 256
  74 #define VQA_HEADER_SIZE 0x2A
  75 #define CHUNK_PREAMBLE_SIZE 8
  76
  77 /* allocate the maximum vector space, regardless of the file version:
  78  * (0xFF00 codebook vectors + 0x100 solid pixel vectors) * (4x4 pixels/block) */
  79 #define MAX_CODEBOOK_VECTORS 0xFF00
  80 #define SOLID_PIXEL_VECTORS 0x100
  81 #define MAX_VECTORS (MAX_CODEBOOK_VECTORS + SOLID_PIXEL_VECTORS)
  82 #define MAX_CODEBOOK_SIZE (MAX_VECTORS * 4 * 4)
  83
  84 #define CBF0_TAG MKBETAG('C', 'B', 'F', '0')
  85 #define CBFZ_TAG MKBETAG('C', 'B', 'F', 'Z')
  86 #define CBP0_TAG MKBETAG('C', 'B', 'P', '0')
  87 #define CBPZ_TAG MKBETAG('C', 'B', 'P', 'Z')
  88 #define CPL0_TAG MKBETAG('C', 'P', 'L', '0')
  89 #define CPLZ_TAG MKBETAG('C', 'P', 'L', 'Z')
  90 #define VPTZ_TAG MKBETAG('V', 'P', 'T', 'Z')
  91
  92 #define VQA_DEBUG 0
  93
  94 #if VQA_DEBUG
  95 #define vqa_debug printf
  96 #else
  97 static inline void vqa_debug(const char *format, ...) { }
  98 #endif
  99
 100 typedef struct VqaContext {
 101
 102     AVCodecContext *avctx;
 103     AVFrame frame;
 104
 105     const unsigned char *buf;
 106     int size;
 107
 108     uint32_t palette[PALETTE_COUNT];
 109
 110     int width;   /* width of a frame */
 111     int height;   /* height of a frame */
 112     int vector_width;  /* width of individual vector */
 113     int vector_height;  /* height of individual vector */
 114     int vqa_version;  /* this should be either 1, 2 or 3 */
 115
 116     unsigned char *codebook;         /* the current codebook */
 117     int codebook_size;
 118     unsigned char *next_codebook_buffer;  /* accumulator for next codebook */
 119     int next_codebook_buffer_index;
 120
 121     unsigned char *decode_buffer;
 122     int decode_buffer_size;
 123
 124     /* number of frames to go before replacing codebook */
 125     int partial_countdown;
 126     int partial_count;
 127
 128 } VqaContext;
 129
 130 static av_cold int vqa_decode_init(AVCodecContext *avctx)
 131 {
 132     VqaContext *s = avctx->priv_data;
 133     unsigned char *vqa_header;
 134     int i, j, codebook_index;
 135
 136     s->avctx = avctx;
 137     avctx->pix_fmt = PIX_FMT_PAL8;
 138
 139     /* make sure the extradata made it */
 140     if (s->avctx->extradata_size != VQA_HEADER_SIZE) {
 141         av_log(s->avctx, AV_LOG_ERROR, "  VQA video: expected extradata size of %d\n", VQA_HEADER_SIZE);
 142         return -1;
 143     }
 144
 145     /* load up the VQA parameters from the header */
 146     vqa_header = (unsigned char *)s->avctx->extradata;
 147     s->vqa_version = vqa_header[0];
 148     s->width = AV_RL16(&vqa_header[6]);
 149     s->height = AV_RL16(&vqa_header[8]);
 150     if(avcodec_check_dimensions(avctx, s->width, s->height)){
 151         s->width= s->height= 0;
 152         return -1;
 153     }
 154     s->vector_width = vqa_header[10];
 155     s->vector_height = vqa_header[11];
 156     s->partial_count = s->partial_countdown = vqa_header[13];
 157
 158     /* the vector dimensions have to meet very stringent requirements */
 159     if ((s->vector_width != 4) ||
 160         ((s->vector_height != 2) && (s->vector_height != 4))) {
 161         /* return without further initialization */
 162         return -1;
 163     }
 164
 165     /* allocate codebooks */
 166     s->codebook_size = MAX_CODEBOOK_SIZE;
 167     s->codebook = av_malloc(s->codebook_size);
 168     s->next_codebook_buffer = av_malloc(s->codebook_size);
 169
 170     /* initialize the solid-color vectors */
 171     if (s->vector_height == 4) {
 172         codebook_index = 0xFF00 * 16;
 173         for (i = 0; i < 256; i++)
 174             for (j = 0; j < 16; j++)
 175                 s->codebook[codebook_index++] = i;
 176     } else {
 177         codebook_index = 0xF00 * 8;
 178         for (i = 0; i < 256; i++)
 179             for (j = 0; j < 8; j++)
 180                 s->codebook[codebook_index++] = i;
 181     }
 182     s->next_codebook_buffer_index = 0;
 183
 184     /* allocate decode buffer */
 185     s->decode_buffer_size = (s->width / s->vector_width) *
 186         (s->height / s->vector_height) * 2;
 187     s->decode_buffer = av_malloc(s->decode_buffer_size);
 188
 189     s->frame.data[0] = NULL;
 190
 191     return 0;
 192 }
 193
 194 #define CHECK_COUNT() \
 195     if (dest_index + count > dest_size) { \
 196         av_log(NULL, AV_LOG_ERROR, "  VQA video: decode_format80 problem: next op would overflow dest_index\n"); \
 197         av_log(NULL, AV_LOG_ERROR, "  VQA video: current dest_index = %d, count = %d, dest_size = %d\n", \
 198             dest_index, count, dest_size); \
 199         return; \
 200     }
 201
 202 static void decode_format80(const unsigned char *src, int src_size,
 203     unsigned char *dest, int dest_size, int check_size) {
 204
 205     int src_index = 0;
 206     int dest_index = 0;
 207     int count;
 208     int src_pos;
 209     unsigned char color;
 210     int i;
 211
 212     while (src_index < src_size) {
 213
 214         vqa_debug("      opcode %02X: ", src[src_index]);
 215
 216         /* 0x80 means that frame is finished */
 217         if (src[src_index] == 0x80)
 218             return;
 219
 220         if (dest_index >= dest_size) {
 221             av_log(NULL, AV_LOG_ERROR, "  VQA video: decode_format80 problem: dest_index (%d) exceeded dest_size (%d)\n",
 222                 dest_index, dest_size);
 223             return;
 224         }
 225
 226         if (src[src_index] == 0xFF) {
 227
 228             src_index++;
 229             count = AV_RL16(&src[src_index]);
 230             src_index += 2;
 231             src_pos = AV_RL16(&src[src_index]);
 232             src_index += 2;
 233             vqa_debug("(1) copy %X bytes from absolute pos %X\n", count, src_pos);
 234             CHECK_COUNT();
 235             for (i = 0; i < count; i++)
 236                 dest[dest_index + i] = dest[src_pos + i];
 237             dest_index += count;
 238
 239         } else if (src[src_index] == 0xFE) {
 240
 241             src_index++;
 242             count = AV_RL16(&src[src_index]);
 243             src_index += 2;
 244             color = src[src_index++];
 245             vqa_debug("(2) set %X bytes to %02X\n", count, color);
 246             CHECK_COUNT();
 247             memset(&dest[dest_index], color, count);
 248             dest_index += count;
 249
 250         } else if ((src[src_index] & 0xC0) == 0xC0) {
 251
 252             count = (src[src_index++] & 0x3F) + 3;
 253             src_pos = AV_RL16(&src[src_index]);
 254             src_index += 2;
 255             vqa_debug("(3) copy %X bytes from absolute pos %X\n", count, src_pos);
 256             CHECK_COUNT();
 257             for (i = 0; i < count; i++)
 258                 dest[dest_index + i] = dest[src_pos + i];
 259             dest_index += count;
 260
 261         } else if (src[src_index] > 0x80) {
 262
 263             count = src[src_index++] & 0x3F;
 264             vqa_debug("(4) copy %X bytes from source to dest\n", count);
 265             CHECK_COUNT();
 266             memcpy(&dest[dest_index], &src[src_index], count);
 267             src_index += count;
 268             dest_index += count;
 269
 270         } else {
 271
 272             count = ((src[src_index] & 0x70) >> 4) + 3;
 273             src_pos = AV_RB16(&src[src_index]) & 0x0FFF;
 274             src_index += 2;
 275             vqa_debug("(5) copy %X bytes from relpos %X\n", count, src_pos);
 276             CHECK_COUNT();
 277             for (i = 0; i < count; i++)
 278                 dest[dest_index + i] = dest[dest_index - src_pos + i];
 279             dest_index += count;
 280         }
 281     }
 282
 283     /* validate that the entire destination buffer was filled; this is
 284      * important for decoding frame maps since each vector needs to have a
 285      * codebook entry; it is not important for compressed codebooks because
 286      * not every entry needs to be filled */
 287     if (check_size)
 288         if (dest_index < dest_size)
 289             av_log(NULL, AV_LOG_ERROR, "  VQA video: decode_format80 problem: decode finished with dest_index (%d) < dest_size (%d)\n",
 290                 dest_index, dest_size);
 291 }
 292
 293 static void vqa_decode_chunk(VqaContext *s)
 294 {
 295     unsigned int chunk_type;
 296     unsigned int chunk_size;
 297     int byte_skip;
 298     unsigned int index = 0;
 299     int i;
 300     unsigned char r, g, b;
 301     int index_shift;
 302
 303     int cbf0_chunk = -1;
 304     int cbfz_chunk = -1;
 305     int cbp0_chunk = -1;
 306     int cbpz_chunk = -1;
 307     int cpl0_chunk = -1;
 308     int cplz_chunk = -1;
 309     int vptz_chunk = -1;
 310
 311     int x, y;
 312     int lines = 0;
 313     int pixel_ptr;
 314     int vector_index = 0;
 315     int lobyte = 0;
 316     int hibyte = 0;
 317     int lobytes = 0;
 318     int hibytes = s->decode_buffer_size / 2;
 319
 320     /* first, traverse through the frame and find the subchunks */
 321     while (index < s->size) {
 322
 323         chunk_type = AV_RB32(&s->buf[index]);
 324         chunk_size = AV_RB32(&s->buf[index + 4]);
 325
 326         switch (chunk_type) {
 327
 328         case CBF0_TAG:
 329             cbf0_chunk = index;
 330             break;
 331
 332         case CBFZ_TAG:
 333             cbfz_chunk = index;
 334             break;
 335
 336         case CBP0_TAG:
 337             cbp0_chunk = index;
 338             break;
 339
 340         case CBPZ_TAG:
 341             cbpz_chunk = index;
 342             break;
 343
 344         case CPL0_TAG:
 345             cpl0_chunk = index;
 346             break;
 347
 348         case CPLZ_TAG:
 349             cplz_chunk = index;
 350             break;
 351
 352         case VPTZ_TAG:
 353             vptz_chunk = index;
 354             break;
 355
 356         default:
 357             av_log(s->avctx, AV_LOG_ERROR, "  VQA video: Found unknown chunk type: %c%c%c%c (%08X)\n",
 358             (chunk_type >> 24) & 0xFF,
 359             (chunk_type >> 16) & 0xFF,
 360             (chunk_type >>  8) & 0xFF,
 361             (chunk_type >>  0) & 0xFF,
 362             chunk_type);
 363             break;
 364         }
 365
 366         byte_skip = chunk_size & 0x01;
 367         index += (CHUNK_PREAMBLE_SIZE + chunk_size + byte_skip);
 368     }
 369
 370     /* next, deal with the palette */
 371     if ((cpl0_chunk != -1) && (cplz_chunk != -1)) {
 372
 373         /* a chunk should not have both chunk types */
 374         av_log(s->avctx, AV_LOG_ERROR, "  VQA video: problem: found both CPL0 and CPLZ chunks\n");
 375         return;
 376     }
 377
 378     /* decompress the palette chunk */
 379     if (cplz_chunk != -1) {
 380
 381 /* yet to be handled */
 382
 383     }
 384
 385     /* convert the RGB palette into the machine's endian format */
 386     if (cpl0_chunk != -1) {
 387
 388         chunk_size = AV_RB32(&s->buf[cpl0_chunk + 4]);
 389         /* sanity check the palette size */
 390         if (chunk_size / 3 > 256) {
 391             av_log(s->avctx, AV_LOG_ERROR, "  VQA video: problem: found a palette chunk with %d colors\n",
 392                 chunk_size / 3);
 393             return;
 394         }
 395         cpl0_chunk += CHUNK_PREAMBLE_SIZE;
 396         for (i = 0; i < chunk_size / 3; i++) {
 397             /* scale by 4 to transform 6-bit palette -> 8-bit */
 398             r = s->buf[cpl0_chunk++] * 4;
 399             g = s->buf[cpl0_chunk++] * 4;
 400             b = s->buf[cpl0_chunk++] * 4;
 401             s->palette[i] = (r << 16) | (g << 8) | (b);
 402         }
 403     }
 404
 405     /* next, look for a full codebook */
 406     if ((cbf0_chunk != -1) && (cbfz_chunk != -1)) {
 407
 408         /* a chunk should not have both chunk types */
 409         av_log(s->avctx, AV_LOG_ERROR, "  VQA video: problem: found both CBF0 and CBFZ chunks\n");
 410         return;
 411     }
 412
 413     /* decompress the full codebook chunk */
 414     if (cbfz_chunk != -1) {
 415
 416         chunk_size = AV_RB32(&s->buf[cbfz_chunk + 4]);
 417         cbfz_chunk += CHUNK_PREAMBLE_SIZE;
 418         decode_format80(&s->buf[cbfz_chunk], chunk_size,
 419             s->codebook, s->codebook_size, 0);
 420     }
 421
 422     /* copy a full codebook */
 423     if (cbf0_chunk != -1) {
 424
 425         chunk_size = AV_RB32(&s->buf[cbf0_chunk + 4]);
 426         /* sanity check the full codebook size */
 427         if (chunk_size > MAX_CODEBOOK_SIZE) {
 428             av_log(s->avctx, AV_LOG_ERROR, "  VQA video: problem: CBF0 chunk too large (0x%X bytes)\n",
 429                 chunk_size);
 430             return;
 431         }
 432         cbf0_chunk += CHUNK_PREAMBLE_SIZE;
 433
 434         memcpy(s->codebook, &s->buf[cbf0_chunk], chunk_size);
 435     }
 436
 437     /* decode the frame */
 438     if (vptz_chunk == -1) {
 439
 440         /* something is wrong if there is no VPTZ chunk */
 441         av_log(s->avctx, AV_LOG_ERROR, "  VQA video: problem: no VPTZ chunk found\n");
 442         return;
 443     }
 444
 445     chunk_size = AV_RB32(&s->buf[vptz_chunk + 4]);
 446     vptz_chunk += CHUNK_PREAMBLE_SIZE;
 447     decode_format80(&s->buf[vptz_chunk], chunk_size,
 448         s->decode_buffer, s->decode_buffer_size, 1);
 449
 450     /* render the final PAL8 frame */
 451     if (s->vector_height == 4)
 452         index_shift = 4;
 453     else
 454         index_shift = 3;
 455     for (y = 0; y < s->frame.linesize[0] * s->height;
 456         y += s->frame.linesize[0] * s->vector_height) {
 457
 458         for (x = y; x < y + s->width; x += 4, lobytes++, hibytes++) {
 459             pixel_ptr = x;
 460
 461             /* get the vector index, the method for which varies according to
 462              * VQA file version */
 463             switch (s->vqa_version) {
 464
 465             case 1:
 466 /* still need sample media for this case (only one game, "Legend of
 467  * Kyrandia III : Malcolm's Revenge", is known to use this version) */
 468                 lobyte = s->decode_buffer[lobytes * 2];
 469                 hibyte = s->decode_buffer[(lobytes * 2) + 1];
 470                 vector_index = ((hibyte << 8) | lobyte) >> 3;
 471                 vector_index <<= index_shift;
 472                 lines = s->vector_height;
 473                 /* uniform color fill - a quick hack */
 474                 if (hibyte == 0xFF) {
 475                     while (lines--) {
 476                         s->frame.data[0][pixel_ptr + 0] = 255 - lobyte;
 477                         s->frame.data[0][pixel_ptr + 1] = 255 - lobyte;
 478                         s->frame.data[0][pixel_ptr + 2] = 255 - lobyte;
 479                         s->frame.data[0][pixel_ptr + 3] = 255 - lobyte;
 480                         pixel_ptr += s->frame.linesize[0];
 481                     }
 482                     lines=0;
 483                 }
 484                 break;
 485
 486             case 2:
 487                 lobyte = s->decode_buffer[lobytes];
 488                 hibyte = s->decode_buffer[hibytes];
 489                 vector_index = (hibyte << 8) | lobyte;
 490                 vector_index <<= index_shift;
 491                 lines = s->vector_height;
 492                 break;
 493
 494             case 3:
 495 /* not implemented yet */
 496                 lines = 0;
 497                 break;
 498             }
 499
 500             while (lines--) {
 501                 s->frame.data[0][pixel_ptr + 0] = s->codebook[vector_index++];
 502                 s->frame.data[0][pixel_ptr + 1] = s->codebook[vector_index++];
 503                 s->frame.data[0][pixel_ptr + 2] = s->codebook[vector_index++];
 504                 s->frame.data[0][pixel_ptr + 3] = s->codebook[vector_index++];
 505                 pixel_ptr += s->frame.linesize[0];
 506             }
 507         }
 508     }
 509
 510     /* handle partial codebook */
 511     if ((cbp0_chunk != -1) && (cbpz_chunk != -1)) {
 512         /* a chunk should not have both chunk types */
 513         av_log(s->avctx, AV_LOG_ERROR, "  VQA video: problem: found both CBP0 and CBPZ chunks\n");
 514         return;
 515     }
 516
 517     if (cbp0_chunk != -1) {
 518
 519         chunk_size = AV_RB32(&s->buf[cbp0_chunk + 4]);
 520         cbp0_chunk += CHUNK_PREAMBLE_SIZE;
 521
 522         /* accumulate partial codebook */
 523         memcpy(&s->next_codebook_buffer[s->next_codebook_buffer_index],
 524             &s->buf[cbp0_chunk], chunk_size);
 525         s->next_codebook_buffer_index += chunk_size;
 526
 527         s->partial_countdown--;
 528         if (s->partial_countdown == 0) {
 529
 530             /* time to replace codebook */
 531             memcpy(s->codebook, s->next_codebook_buffer,
 532                 s->next_codebook_buffer_index);
 533
 534             /* reset accounting */
 535             s->next_codebook_buffer_index = 0;
 536             s->partial_countdown = s->partial_count;
 537         }
 538     }
 539
 540     if (cbpz_chunk != -1) {
 541
 542         chunk_size = AV_RB32(&s->buf[cbpz_chunk + 4]);
 543         cbpz_chunk += CHUNK_PREAMBLE_SIZE;
 544
 545         /* accumulate partial codebook */
 546         memcpy(&s->next_codebook_buffer[s->next_codebook_buffer_index],
 547             &s->buf[cbpz_chunk], chunk_size);
 548         s->next_codebook_buffer_index += chunk_size;
 549
 550         s->partial_countdown--;
 551         if (s->partial_countdown == 0) {
 552
 553             /* decompress codebook */
 554             decode_format80(s->next_codebook_buffer,
 555                 s->next_codebook_buffer_index,
 556                 s->codebook, s->codebook_size, 0);
 557
 558             /* reset accounting */
 559             s->next_codebook_buffer_index = 0;
 560             s->partial_countdown = s->partial_count;
 561         }
 562     }
 563 }
 564
 565 static int vqa_decode_frame(AVCodecContext *avctx,
 566                             void *data, int *data_size,
 567                             AVPacket *avpkt)
 568 {
 569     const uint8_t *buf = avpkt->data;
 570     int buf_size = avpkt->size;
 571     VqaContext *s = avctx->priv_data;
 572
 573     s->buf = buf;
 574     s->size = buf_size;
 575
 576     if (s->frame.data[0])
 577         avctx->release_buffer(avctx, &s->frame);
 578
 579     if (avctx->get_buffer(avctx, &s->frame)) {
 580         av_log(s->avctx, AV_LOG_ERROR, "  VQA Video: get_buffer() failed\n");
 581         return -1;
 582     }
 583
 584     vqa_decode_chunk(s);
 585
 586     /* make the palette available on the way out */
 587     memcpy(s->frame.data[1], s->palette, PALETTE_COUNT * 4);
 588     s->frame.palette_has_changed = 1;
 589
 590     *data_size = sizeof(AVFrame);
 591     *(AVFrame*)data = s->frame;
 592
 593     /* report that the buffer was completely consumed */
 594     return buf_size;
 595 }
 596
 597 static av_cold int vqa_decode_end(AVCodecContext *avctx)
 598 {
 599     VqaContext *s = avctx->priv_data;
 600
 601     av_free(s->codebook);
 602     av_free(s->next_codebook_buffer);
 603     av_free(s->decode_buffer);
 604
 605     if (s->frame.data[0])
 606         avctx->release_buffer(avctx, &s->frame);
 607
 608     return 0;
 609 }
 610
 611 AVCodec vqa_decoder = {
 612     "vqavideo",
 613     CODEC_TYPE_VIDEO,
 614     CODEC_ID_WS_VQA,
 615     sizeof(VqaContext),
 616     vqa_decode_init,
 617     NULL,
 618     vqa_decode_end,
 619     vqa_decode_frame,
 620     CODEC_CAP_DR1,
 621     .long_name = NULL_IF_CONFIG_SMALL("Westwood Studios VQA (Vector Quantized Animation) video"),
 622 };