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 #include <unistd.h>
  70
  71 #include "libavutil/intreadwrite.h"
  72 #include "avcodec.h"
  73
  74 #define PALETTE_COUNT 256
  75 #define VQA_HEADER_SIZE 0x2A
  76 #define CHUNK_PREAMBLE_SIZE 8
  77
  78 /* allocate the maximum vector space, regardless of the file version:
  79  * (0xFF00 codebook vectors + 0x100 solid pixel vectors) * (4x4 pixels/block) */
  80 #define MAX_CODEBOOK_VECTORS 0xFF00
  81 #define SOLID_PIXEL_VECTORS 0x100
  82 #define MAX_VECTORS (MAX_CODEBOOK_VECTORS + SOLID_PIXEL_VECTORS)
  83 #define MAX_CODEBOOK_SIZE (MAX_VECTORS * 4 * 4)
  84
  85 #define CBF0_TAG MKBETAG('C', 'B', 'F', '0')
  86 #define CBFZ_TAG MKBETAG('C', 'B', 'F', 'Z')
  87 #define CBP0_TAG MKBETAG('C', 'B', 'P', '0')
  88 #define CBPZ_TAG MKBETAG('C', 'B', 'P', 'Z')
  89 #define CPL0_TAG MKBETAG('C', 'P', 'L', '0')
  90 #define CPLZ_TAG MKBETAG('C', 'P', 'L', 'Z')
  91 #define VPTZ_TAG MKBETAG('V', 'P', 'T', 'Z')
  92
  93 #define VQA_DEBUG 0
  94
  95 #if VQA_DEBUG
  96 #define vqa_debug printf
  97 #else
  98 static inline void vqa_debug(const char *format, ...) { }
  99 #endif
 100
 101 typedef struct VqaContext {
 102
 103     AVCodecContext *avctx;
 104     AVFrame frame;
 105
 106     const unsigned char *buf;
 107     int size;
 108
 109     uint32_t palette[PALETTE_COUNT];
 110
 111     int width;   /* width of a frame */
 112     int height;   /* height of a frame */
 113     int vector_width;  /* width of individual vector */
 114     int vector_height;  /* height of individual vector */
 115     int vqa_version;  /* this should be either 1, 2 or 3 */
 116
 117     unsigned char *codebook;         /* the current codebook */
 118     int codebook_size;
 119     unsigned char *next_codebook_buffer;  /* accumulator for next codebook */
 120     int next_codebook_buffer_index;
 121
 122     unsigned char *decode_buffer;
 123     int decode_buffer_size;
 124
 125     /* number of frames to go before replacing codebook */
 126     int partial_countdown;
 127     int partial_count;
 128
 129 } VqaContext;
 130
 131 static av_cold int vqa_decode_init(AVCodecContext *avctx)
 132 {
 133     VqaContext *s = avctx->priv_data;
 134     unsigned char *vqa_header;
 135     int i, j, codebook_index;
 136
 137     s->avctx = avctx;
 138     avctx->pix_fmt = PIX_FMT_PAL8;
 139
 140     /* make sure the extradata made it */
 141     if (s->avctx->extradata_size != VQA_HEADER_SIZE) {
 142         av_log(s->avctx, AV_LOG_ERROR, "  VQA video: expected extradata size of %d\n", VQA_HEADER_SIZE);
 143         return -1;
 144     }
 145
 146     /* load up the VQA parameters from the header */
 147     vqa_header = (unsigned char *)s->avctx->extradata;
 148     s->vqa_version = vqa_header[0];
 149     s->width = AV_RL16(&vqa_header[6]);
 150     s->height = AV_RL16(&vqa_header[8]);
 151     if(avcodec_check_dimensions(avctx, s->width, s->height)){
 152         s->width= s->height= 0;
 153         return -1;
 154     }
 155     s->vector_width = vqa_header[10];
 156     s->vector_height = vqa_header[11];
 157     s->partial_count = s->partial_countdown = vqa_header[13];
 158
 159     /* the vector dimensions have to meet very stringent requirements */
 160     if ((s->vector_width != 4) ||
 161         ((s->vector_height != 2) && (s->vector_height != 4))) {
 162         /* return without further initialization */
 163         return -1;
 164     }
 165
 166     /* allocate codebooks */
 167     s->codebook_size = MAX_CODEBOOK_SIZE;
 168     s->codebook = av_malloc(s->codebook_size);
 169     s->next_codebook_buffer = av_malloc(s->codebook_size);
 170
 171     /* initialize the solid-color vectors */
 172     if (s->vector_height == 4) {
 173         codebook_index = 0xFF00 * 16;
 174         for (i = 0; i < 256; i++)
 175             for (j = 0; j < 16; j++)
 176                 s->codebook[codebook_index++] = i;
 177     } else {
 178         codebook_index = 0xF00 * 8;
 179         for (i = 0; i < 256; i++)
 180             for (j = 0; j < 8; j++)
 181                 s->codebook[codebook_index++] = i;
 182     }
 183     s->next_codebook_buffer_index = 0;
 184
 185     /* allocate decode buffer */
 186     s->decode_buffer_size = (s->width / s->vector_width) *
 187         (s->height / s->vector_height) * 2;
 188     s->decode_buffer = av_malloc(s->decode_buffer_size);
 189
 190     s->frame.data[0] = NULL;
 191
 192     return 0;
 193 }
 194
 195 #define CHECK_COUNT() \
 196     if (dest_index + count > dest_size) { \
 197         av_log(NULL, AV_LOG_ERROR, "  VQA video: decode_format80 problem: next op would overflow dest_index\n"); \
 198         av_log(NULL, AV_LOG_ERROR, "  VQA video: current dest_index = %d, count = %d, dest_size = %d\n", \
 199             dest_index, count, dest_size); \
 200         return; \
 201     }
 202
 203 static void decode_format80(const unsigned char *src, int src_size,
 204     unsigned char *dest, int dest_size, int check_size) {
 205
 206     int src_index = 0;
 207     int dest_index = 0;
 208     int count;
 209     int src_pos;
 210     unsigned char color;
 211     int i;
 212
 213     while (src_index < src_size) {
 214
 215         vqa_debug("      opcode %02X: ", src[src_index]);
 216
 217         /* 0x80 means that frame is finished */
 218         if (src[src_index] == 0x80)
 219             return;
 220
 221         if (dest_index >= dest_size) {
 222             av_log(NULL, AV_LOG_ERROR, "  VQA video: decode_format80 problem: dest_index (%d) exceeded dest_size (%d)\n",
 223                 dest_index, dest_size);
 224             return;
 225         }
 226
 227         if (src[src_index] == 0xFF) {
 228
 229             src_index++;
 230             count = AV_RL16(&src[src_index]);
 231             src_index += 2;
 232             src_pos = AV_RL16(&src[src_index]);
 233             src_index += 2;
 234             vqa_debug("(1) copy %X bytes from absolute pos %X\n", count, src_pos);
 235             CHECK_COUNT();
 236             for (i = 0; i < count; i++)
 237                 dest[dest_index + i] = dest[src_pos + i];
 238             dest_index += count;
 239
 240         } else if (src[src_index] == 0xFE) {
 241
 242             src_index++;
 243             count = AV_RL16(&src[src_index]);
 244             src_index += 2;
 245             color = src[src_index++];
 246             vqa_debug("(2) set %X bytes to %02X\n", count, color);
 247             CHECK_COUNT();
 248             memset(&dest[dest_index], color, count);
 249             dest_index += count;
 250
 251         } else if ((src[src_index] & 0xC0) == 0xC0) {
 252
 253             count = (src[src_index++] & 0x3F) + 3;
 254             src_pos = AV_RL16(&src[src_index]);
 255             src_index += 2;
 256             vqa_debug("(3) copy %X bytes from absolute pos %X\n", count, src_pos);
 257             CHECK_COUNT();
 258             for (i = 0; i < count; i++)
 259                 dest[dest_index + i] = dest[src_pos + i];
 260             dest_index += count;
 261
 262         } else if (src[src_index] > 0x80) {
 263
 264             count = src[src_index++] & 0x3F;
 265             vqa_debug("(4) copy %X bytes from source to dest\n", count);
 266             CHECK_COUNT();
 267             memcpy(&dest[dest_index], &src[src_index], count);
 268             src_index += count;
 269             dest_index += count;
 270
 271         } else {
 272
 273             count = ((src[src_index] & 0x70) >> 4) + 3;
 274             src_pos = AV_RB16(&src[src_index]) & 0x0FFF;
 275             src_index += 2;
 276             vqa_debug("(5) copy %X bytes from relpos %X\n", count, src_pos);
 277             CHECK_COUNT();
 278             for (i = 0; i < count; i++)
 279                 dest[dest_index + i] = dest[dest_index - src_pos + i];
 280             dest_index += count;
 281         }
 282     }
 283
 284     /* validate that the entire destination buffer was filled; this is
 285      * important for decoding frame maps since each vector needs to have a
 286      * codebook entry; it is not important for compressed codebooks because
 287      * not every entry needs to be filled */
 288     if (check_size)
 289         if (dest_index < dest_size)
 290             av_log(NULL, AV_LOG_ERROR, "  VQA video: decode_format80 problem: decode finished with dest_index (%d) < dest_size (%d)\n",
 291                 dest_index, dest_size);
 292 }
 293
 294 static void vqa_decode_chunk(VqaContext *s)
 295 {
 296     unsigned int chunk_type;
 297     unsigned int chunk_size;
 298     int byte_skip;
 299     unsigned int index = 0;
 300     int i;
 301     unsigned char r, g, b;
 302     int index_shift;
 303
 304     int cbf0_chunk = -1;
 305     int cbfz_chunk = -1;
 306     int cbp0_chunk = -1;
 307     int cbpz_chunk = -1;
 308     int cpl0_chunk = -1;
 309     int cplz_chunk = -1;
 310     int vptz_chunk = -1;
 311
 312     int x, y;
 313     int lines = 0;
 314     int pixel_ptr;
 315     int vector_index = 0;
 316     int lobyte = 0;
 317     int hibyte = 0;
 318     int lobytes = 0;
 319     int hibytes = s->decode_buffer_size / 2;
 320
 321     /* first, traverse through the frame and find the subchunks */
 322     while (index < s->size) {
 323
 324         chunk_type = AV_RB32(&s->buf[index]);
 325         chunk_size = AV_RB32(&s->buf[index + 4]);
 326
 327         switch (chunk_type) {
 328
 329         case CBF0_TAG:
 330             cbf0_chunk = index;
 331             break;
 332
 333         case CBFZ_TAG:
 334             cbfz_chunk = index;
 335             break;
 336
 337         case CBP0_TAG:
 338             cbp0_chunk = index;
 339             break;
 340
 341         case CBPZ_TAG:
 342             cbpz_chunk = index;
 343             break;
 344
 345         case CPL0_TAG:
 346             cpl0_chunk = index;
 347             break;
 348
 349         case CPLZ_TAG:
 350             cplz_chunk = index;
 351             break;
 352
 353         case VPTZ_TAG:
 354             vptz_chunk = index;
 355             break;
 356
 357         default:
 358             av_log(s->avctx, AV_LOG_ERROR, "  VQA video: Found unknown chunk type: %c%c%c%c (%08X)\n",
 359             (chunk_type >> 24) & 0xFF,
 360             (chunk_type >> 16) & 0xFF,
 361             (chunk_type >>  8) & 0xFF,
 362             (chunk_type >>  0) & 0xFF,
 363             chunk_type);
 364             break;
 365         }
 366
 367         byte_skip = chunk_size & 0x01;
 368         index += (CHUNK_PREAMBLE_SIZE + chunk_size + byte_skip);
 369     }
 370
 371     /* next, deal with the palette */
 372     if ((cpl0_chunk != -1) && (cplz_chunk != -1)) {
 373
 374         /* a chunk should not have both chunk types */
 375         av_log(s->avctx, AV_LOG_ERROR, "  VQA video: problem: found both CPL0 and CPLZ chunks\n");
 376         return;
 377     }
 378
 379     /* decompress the palette chunk */
 380     if (cplz_chunk != -1) {
 381
 382 /* yet to be handled */
 383
 384     }
 385
 386     /* convert the RGB palette into the machine's endian format */
 387     if (cpl0_chunk != -1) {
 388
 389         chunk_size = AV_RB32(&s->buf[cpl0_chunk + 4]);
 390         /* sanity check the palette size */
 391         if (chunk_size / 3 > 256) {
 392             av_log(s->avctx, AV_LOG_ERROR, "  VQA video: problem: found a palette chunk with %d colors\n",
 393                 chunk_size / 3);
 394             return;
 395         }
 396         cpl0_chunk += CHUNK_PREAMBLE_SIZE;
 397         for (i = 0; i < chunk_size / 3; i++) {
 398             /* scale by 4 to transform 6-bit palette -> 8-bit */
 399             r = s->buf[cpl0_chunk++] * 4;
 400             g = s->buf[cpl0_chunk++] * 4;
 401             b = s->buf[cpl0_chunk++] * 4;
 402             s->palette[i] = (r << 16) | (g << 8) | (b);
 403         }
 404     }
 405
 406     /* next, look for a full codebook */
 407     if ((cbf0_chunk != -1) && (cbfz_chunk != -1)) {
 408
 409         /* a chunk should not have both chunk types */
 410         av_log(s->avctx, AV_LOG_ERROR, "  VQA video: problem: found both CBF0 and CBFZ chunks\n");
 411         return;
 412     }
 413
 414     /* decompress the full codebook chunk */
 415     if (cbfz_chunk != -1) {
 416
 417         chunk_size = AV_RB32(&s->buf[cbfz_chunk + 4]);
 418         cbfz_chunk += CHUNK_PREAMBLE_SIZE;
 419         decode_format80(&s->buf[cbfz_chunk], chunk_size,
 420             s->codebook, s->codebook_size, 0);
 421     }
 422
 423     /* copy a full codebook */
 424     if (cbf0_chunk != -1) {
 425
 426         chunk_size = AV_RB32(&s->buf[cbf0_chunk + 4]);
 427         /* sanity check the full codebook size */
 428         if (chunk_size > MAX_CODEBOOK_SIZE) {
 429             av_log(s->avctx, AV_LOG_ERROR, "  VQA video: problem: CBF0 chunk too large (0x%X bytes)\n",
 430                 chunk_size);
 431             return;
 432         }
 433         cbf0_chunk += CHUNK_PREAMBLE_SIZE;
 434
 435         memcpy(s->codebook, &s->buf[cbf0_chunk], chunk_size);
 436     }
 437
 438     /* decode the frame */
 439     if (vptz_chunk == -1) {
 440
 441         /* something is wrong if there is no VPTZ chunk */
 442         av_log(s->avctx, AV_LOG_ERROR, "  VQA video: problem: no VPTZ chunk found\n");
 443         return;
 444     }
 445
 446     chunk_size = AV_RB32(&s->buf[vptz_chunk + 4]);
 447     vptz_chunk += CHUNK_PREAMBLE_SIZE;
 448     decode_format80(&s->buf[vptz_chunk], chunk_size,
 449         s->decode_buffer, s->decode_buffer_size, 1);
 450
 451     /* render the final PAL8 frame */
 452     if (s->vector_height == 4)
 453         index_shift = 4;
 454     else
 455         index_shift = 3;
 456     for (y = 0; y < s->frame.linesize[0] * s->height;
 457         y += s->frame.linesize[0] * s->vector_height) {
 458
 459         for (x = y; x < y + s->width; x += 4, lobytes++, hibytes++) {
 460             pixel_ptr = x;
 461
 462             /* get the vector index, the method for which varies according to
 463              * VQA file version */
 464             switch (s->vqa_version) {
 465
 466             case 1:
 467 /* still need sample media for this case (only one game, "Legend of
 468  * Kyrandia III : Malcolm's Revenge", is known to use this version) */
 469                 lobyte = s->decode_buffer[lobytes * 2];
 470                 hibyte = s->decode_buffer[(lobytes * 2) + 1];
 471                 vector_index = ((hibyte << 8) | lobyte) >> 3;
 472                 vector_index <<= index_shift;
 473                 lines = s->vector_height;
 474                 /* uniform color fill - a quick hack */
 475                 if (hibyte == 0xFF) {
 476                     while (lines--) {
 477                         s->frame.data[0][pixel_ptr + 0] = 255 - lobyte;
 478                         s->frame.data[0][pixel_ptr + 1] = 255 - lobyte;
 479                         s->frame.data[0][pixel_ptr + 2] = 255 - lobyte;
 480                         s->frame.data[0][pixel_ptr + 3] = 255 - lobyte;
 481                         pixel_ptr += s->frame.linesize[0];
 482                     }
 483                     lines=0;
 484                 }
 485                 break;
 486
 487             case 2:
 488                 lobyte = s->decode_buffer[lobytes];
 489                 hibyte = s->decode_buffer[hibytes];
 490                 vector_index = (hibyte << 8) | lobyte;
 491                 vector_index <<= index_shift;
 492                 lines = s->vector_height;
 493                 break;
 494
 495             case 3:
 496 /* not implemented yet */
 497                 lines = 0;
 498                 break;
 499             }
 500
 501             while (lines--) {
 502                 s->frame.data[0][pixel_ptr + 0] = s->codebook[vector_index++];
 503                 s->frame.data[0][pixel_ptr + 1] = s->codebook[vector_index++];
 504                 s->frame.data[0][pixel_ptr + 2] = s->codebook[vector_index++];
 505                 s->frame.data[0][pixel_ptr + 3] = s->codebook[vector_index++];
 506                 pixel_ptr += s->frame.linesize[0];
 507             }
 508         }
 509     }
 510
 511     /* handle partial codebook */
 512     if ((cbp0_chunk != -1) && (cbpz_chunk != -1)) {
 513         /* a chunk should not have both chunk types */
 514         av_log(s->avctx, AV_LOG_ERROR, "  VQA video: problem: found both CBP0 and CBPZ chunks\n");
 515         return;
 516     }
 517
 518     if (cbp0_chunk != -1) {
 519
 520         chunk_size = AV_RB32(&s->buf[cbp0_chunk + 4]);
 521         cbp0_chunk += CHUNK_PREAMBLE_SIZE;
 522
 523         /* accumulate partial codebook */
 524         memcpy(&s->next_codebook_buffer[s->next_codebook_buffer_index],
 525             &s->buf[cbp0_chunk], chunk_size);
 526         s->next_codebook_buffer_index += chunk_size;
 527
 528         s->partial_countdown--;
 529         if (s->partial_countdown == 0) {
 530
 531             /* time to replace codebook */
 532             memcpy(s->codebook, s->next_codebook_buffer,
 533                 s->next_codebook_buffer_index);
 534
 535             /* reset accounting */
 536             s->next_codebook_buffer_index = 0;
 537             s->partial_countdown = s->partial_count;
 538         }
 539     }
 540
 541     if (cbpz_chunk != -1) {
 542
 543         chunk_size = AV_RB32(&s->buf[cbpz_chunk + 4]);
 544         cbpz_chunk += CHUNK_PREAMBLE_SIZE;
 545
 546         /* accumulate partial codebook */
 547         memcpy(&s->next_codebook_buffer[s->next_codebook_buffer_index],
 548             &s->buf[cbpz_chunk], chunk_size);
 549         s->next_codebook_buffer_index += chunk_size;
 550
 551         s->partial_countdown--;
 552         if (s->partial_countdown == 0) {
 553
 554             /* decompress codebook */
 555             decode_format80(s->next_codebook_buffer,
 556                 s->next_codebook_buffer_index,
 557                 s->codebook, s->codebook_size, 0);
 558
 559             /* reset accounting */
 560             s->next_codebook_buffer_index = 0;
 561             s->partial_countdown = s->partial_count;
 562         }
 563     }
 564 }
 565
 566 static int vqa_decode_frame(AVCodecContext *avctx,
 567                             void *data, int *data_size,
 568                             AVPacket *avpkt)
 569 {
 570     const uint8_t *buf = avpkt->data;
 571     int buf_size = avpkt->size;
 572     VqaContext *s = avctx->priv_data;
 573
 574     s->buf = buf;
 575     s->size = buf_size;
 576
 577     if (s->frame.data[0])
 578         avctx->release_buffer(avctx, &s->frame);
 579
 580     if (avctx->get_buffer(avctx, &s->frame)) {
 581         av_log(s->avctx, AV_LOG_ERROR, "  VQA Video: get_buffer() failed\n");
 582         return -1;
 583     }
 584
 585     vqa_decode_chunk(s);
 586
 587     /* make the palette available on the way out */
 588     memcpy(s->frame.data[1], s->palette, PALETTE_COUNT * 4);
 589     s->frame.palette_has_changed = 1;
 590
 591     *data_size = sizeof(AVFrame);
 592     *(AVFrame*)data = s->frame;
 593
 594     /* report that the buffer was completely consumed */
 595     return buf_size;
 596 }
 597
 598 static av_cold int vqa_decode_end(AVCodecContext *avctx)
 599 {
 600     VqaContext *s = avctx->priv_data;
 601
 602     av_free(s->codebook);
 603     av_free(s->next_codebook_buffer);
 604     av_free(s->decode_buffer);
 605
 606     if (s->frame.data[0])
 607         avctx->release_buffer(avctx, &s->frame);
 608
 609     return 0;
 610 }
 611
 612 AVCodec vqa_decoder = {
 613     "vqavideo",
 614     CODEC_TYPE_VIDEO,
 615     CODEC_ID_WS_VQA,
 616     sizeof(VqaContext),
 617     vqa_decode_init,
 618     NULL,
 619     vqa_decode_end,
 620     vqa_decode_frame,
 621     CODEC_CAP_DR1,
 622     .long_name = NULL_IF_CONFIG_SMALL("Westwood Studios VQA (Vector Quantized Animation) video"),
 623 };