libavcodec/zmbv.c

   1 /*
   2  * Zip Motion Blocks Video (ZMBV) decoder
   3  * Copyright (c) 2006 Konstantin Shishkov
   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  * Zip Motion Blocks Video decoder
  25  */
  26
  27 #include <stdio.h>
  28 #include <stdlib.h>
  29
  30 #include "libavutil/common.h"
  31 #include "libavutil/intreadwrite.h"
  32 #include "avcodec.h"
  33 #include "internal.h"
  34
  35 #include <zlib.h>
  36
  37 #define ZMBV_KEYFRAME 1
  38 #define ZMBV_DELTAPAL 2
  39
  40 enum ZmbvFormat {
  41     ZMBV_FMT_NONE  = 0,
  42     ZMBV_FMT_1BPP  = 1,
  43     ZMBV_FMT_2BPP  = 2,
  44     ZMBV_FMT_4BPP  = 3,
  45     ZMBV_FMT_8BPP  = 4,
  46     ZMBV_FMT_15BPP = 5,
  47     ZMBV_FMT_16BPP = 6,
  48     ZMBV_FMT_24BPP = 7,
  49     ZMBV_FMT_32BPP = 8
  50 };
  51
  52 /*
  53  * Decoder context
  54  */
  55 typedef struct ZmbvContext {
  56     AVCodecContext *avctx;
  57
  58     int bpp;
  59     unsigned int decomp_size;
  60     uint8_t* decomp_buf;
  61     uint8_t pal[768];
  62     uint8_t *prev, *cur;
  63     int width, height;
  64     int fmt;
  65     int comp;
  66     int flags;
  67     int bw, bh, bx, by;
  68     int decomp_len;
  69     z_stream zstream;
  70     int (*decode_intra)(struct ZmbvContext *c);
  71     int (*decode_xor)(struct ZmbvContext *c);
  72 } ZmbvContext;
  73
  74 /**
  75  * Decode XOR'ed frame - 8bpp version
  76  */
  77
  78 static int zmbv_decode_xor_8(ZmbvContext *c)
  79 {
  80     uint8_t *src = c->decomp_buf;
  81     uint8_t *output, *prev;
  82     int8_t *mvec;
  83     int x, y;
  84     int d, dx, dy, bw2, bh2;
  85     int block;
  86     int i, j;
  87     int mx, my;
  88
  89     output = c->cur;
  90     prev = c->prev;
  91
  92     if (c->flags & ZMBV_DELTAPAL) {
  93         for (i = 0; i < 768; i++)
  94             c->pal[i] ^= *src++;
  95     }
  96
  97     mvec = (int8_t*)src;
  98     src += ((c->bx * c->by * 2 + 3) & ~3);
  99
 100     block = 0;
 101     for (y = 0; y < c->height; y += c->bh) {
 102         bh2 = ((c->height - y) > c->bh) ? c->bh : (c->height - y);
 103         for (x = 0; x < c->width; x += c->bw) {
 104             uint8_t *out, *tprev;
 105
 106             d = mvec[block] & 1;
 107             dx = mvec[block] >> 1;
 108             dy = mvec[block + 1] >> 1;
 109             block += 2;
 110
 111             bw2 = ((c->width - x) > c->bw) ? c->bw : (c->width - x);
 112
 113             /* copy block - motion vectors out of bounds are used to zero blocks */
 114             out = output + x;
 115             tprev = prev + x + dx + dy * c->width;
 116             mx = x + dx;
 117             my = y + dy;
 118             for (j = 0; j < bh2; j++) {
 119                 if (my + j < 0 || my + j >= c->height) {
 120                     memset(out, 0, bw2);
 121                 } else {
 122                     for (i = 0; i < bw2; i++) {
 123                         if (mx + i < 0 || mx + i >= c->width)
 124                             out[i] = 0;
 125                         else
 126                             out[i] = tprev[i];
 127                     }
 128                 }
 129                 out += c->width;
 130                 tprev += c->width;
 131             }
 132
 133             if (d) { /* apply XOR'ed difference */
 134                 out = output + x;
 135                 for (j = 0; j < bh2; j++) {
 136                     for (i = 0; i < bw2; i++)
 137                         out[i] ^= *src++;
 138                     out += c->width;
 139                 }
 140             }
 141         }
 142         output += c->width * c->bh;
 143         prev += c->width * c->bh;
 144     }
 145     if (src - c->decomp_buf != c->decomp_len)
 146         av_log(c->avctx, AV_LOG_ERROR, "Used %ti of %i bytes\n",
 147                src-c->decomp_buf, c->decomp_len);
 148     return 0;
 149 }
 150
 151 /**
 152  * Decode XOR'ed frame - 15bpp and 16bpp version
 153  */
 154
 155 static int zmbv_decode_xor_16(ZmbvContext *c)
 156 {
 157     uint8_t *src = c->decomp_buf;
 158     uint16_t *output, *prev;
 159     int8_t *mvec;
 160     int x, y;
 161     int d, dx, dy, bw2, bh2;
 162     int block;
 163     int i, j;
 164     int mx, my;
 165
 166     output = (uint16_t*)c->cur;
 167     prev = (uint16_t*)c->prev;
 168
 169     mvec = (int8_t*)src;
 170     src += ((c->bx * c->by * 2 + 3) & ~3);
 171
 172     block = 0;
 173     for (y = 0; y < c->height; y += c->bh) {
 174         bh2 = ((c->height - y) > c->bh) ? c->bh : (c->height - y);
 175         for (x = 0; x < c->width; x += c->bw) {
 176             uint16_t *out, *tprev;
 177
 178             d = mvec[block] & 1;
 179             dx = mvec[block] >> 1;
 180             dy = mvec[block + 1] >> 1;
 181             block += 2;
 182
 183             bw2 = ((c->width - x) > c->bw) ? c->bw : (c->width - x);
 184
 185             /* copy block - motion vectors out of bounds are used to zero blocks */
 186             out = output + x;
 187             tprev = prev + x + dx + dy * c->width;
 188             mx = x + dx;
 189             my = y + dy;
 190             for (j = 0; j < bh2; j++) {
 191                 if (my + j < 0 || my + j >= c->height) {
 192                     memset(out, 0, bw2 * 2);
 193                 } else {
 194                     for (i = 0; i < bw2; i++) {
 195                         if (mx + i < 0 || mx + i >= c->width)
 196                             out[i] = 0;
 197                         else
 198                             out[i] = tprev[i];
 199                     }
 200                 }
 201                 out += c->width;
 202                 tprev += c->width;
 203             }
 204
 205             if (d) { /* apply XOR'ed difference */
 206                 out = output + x;
 207                 for (j = 0; j < bh2; j++){
 208                     for (i = 0; i < bw2; i++) {
 209                         out[i] ^= *((uint16_t*)src);
 210                         src += 2;
 211                     }
 212                     out += c->width;
 213                 }
 214             }
 215         }
 216         output += c->width * c->bh;
 217         prev += c->width * c->bh;
 218     }
 219     if (src - c->decomp_buf != c->decomp_len)
 220         av_log(c->avctx, AV_LOG_ERROR, "Used %ti of %i bytes\n",
 221                src-c->decomp_buf, c->decomp_len);
 222     return 0;
 223 }
 224
 225 #ifdef ZMBV_ENABLE_24BPP
 226 /**
 227  * Decode XOR'ed frame - 24bpp version
 228  */
 229
 230 static int zmbv_decode_xor_24(ZmbvContext *c)
 231 {
 232     uint8_t *src = c->decomp_buf;
 233     uint8_t *output, *prev;
 234     int8_t *mvec;
 235     int x, y;
 236     int d, dx, dy, bw2, bh2;
 237     int block;
 238     int i, j;
 239     int mx, my;
 240     int stride;
 241
 242     output = c->cur;
 243     prev = c->prev;
 244
 245     stride = c->width * 3;
 246     mvec = (int8_t*)src;
 247     src += ((c->bx * c->by * 2 + 3) & ~3);
 248
 249     block = 0;
 250     for (y = 0; y < c->height; y += c->bh) {
 251         bh2 = ((c->height - y) > c->bh) ? c->bh : (c->height - y);
 252         for (x = 0; x < c->width; x += c->bw) {
 253             uint8_t *out, *tprev;
 254
 255             d = mvec[block] & 1;
 256             dx = mvec[block] >> 1;
 257             dy = mvec[block + 1] >> 1;
 258             block += 2;
 259
 260             bw2 = ((c->width - x) > c->bw) ? c->bw : (c->width - x);
 261
 262             /* copy block - motion vectors out of bounds are used to zero blocks */
 263             out = output + x * 3;
 264             tprev = prev + (x + dx) * 3 + dy * stride;
 265             mx = x + dx;
 266             my = y + dy;
 267             for (j = 0; j < bh2; j++) {
 268                 if (my + j < 0 || my + j >= c->height) {
 269                     memset(out, 0, bw2 * 3);
 270                 } else {
 271                     for (i = 0; i < bw2; i++){
 272                         if (mx + i < 0 || mx + i >= c->width) {
 273                             out[i * 3 + 0] = 0;
 274                             out[i * 3 + 1] = 0;
 275                             out[i * 3 + 2] = 0;
 276                         } else {
 277                             out[i * 3 + 0] = tprev[i * 3 + 0];
 278                             out[i * 3 + 1] = tprev[i * 3 + 1];
 279                             out[i * 3 + 2] = tprev[i * 3 + 2];
 280                         }
 281                     }
 282                 }
 283                 out += stride;
 284                 tprev += stride;
 285             }
 286
 287             if (d) { /* apply XOR'ed difference */
 288                 out = output + x * 3;
 289                 for (j = 0; j < bh2; j++) {
 290                     for (i = 0; i < bw2; i++) {
 291                         out[i * 3 + 0] ^= *src++;
 292                         out[i * 3 + 1] ^= *src++;
 293                         out[i * 3 + 2] ^= *src++;
 294                     }
 295                     out += stride;
 296                 }
 297             }
 298         }
 299         output += stride * c->bh;
 300         prev += stride * c->bh;
 301     }
 302     if (src - c->decomp_buf != c->decomp_len)
 303         av_log(c->avctx, AV_LOG_ERROR, "Used %i of %i bytes\n",
 304                src-c->decomp_buf, c->decomp_len);
 305     return 0;
 306 }
 307 #endif //ZMBV_ENABLE_24BPP
 308
 309 /**
 310  * Decode XOR'ed frame - 32bpp version
 311  */
 312
 313 static int zmbv_decode_xor_32(ZmbvContext *c)
 314 {
 315     uint8_t *src = c->decomp_buf;
 316     uint32_t *output, *prev;
 317     int8_t *mvec;
 318     int x, y;
 319     int d, dx, dy, bw2, bh2;
 320     int block;
 321     int i, j;
 322     int mx, my;
 323
 324     output = (uint32_t*)c->cur;
 325     prev = (uint32_t*)c->prev;
 326
 327     mvec = (int8_t*)src;
 328     src += ((c->bx * c->by * 2 + 3) & ~3);
 329
 330     block = 0;
 331     for (y = 0; y < c->height; y += c->bh) {
 332         bh2 = ((c->height - y) > c->bh) ? c->bh : (c->height - y);
 333         for (x = 0; x < c->width; x += c->bw) {
 334             uint32_t *out, *tprev;
 335
 336             d = mvec[block] & 1;
 337             dx = mvec[block] >> 1;
 338             dy = mvec[block + 1] >> 1;
 339             block += 2;
 340
 341             bw2 = ((c->width - x) > c->bw) ? c->bw : (c->width - x);
 342
 343             /* copy block - motion vectors out of bounds are used to zero blocks */
 344             out = output + x;
 345             tprev = prev + x + dx + dy * c->width;
 346             mx = x + dx;
 347             my = y + dy;
 348             for (j = 0; j < bh2; j++) {
 349                 if (my + j < 0 || my + j >= c->height) {
 350                     memset(out, 0, bw2 * 4);
 351                 } else {
 352                     for (i = 0; i < bw2; i++){
 353                         if (mx + i < 0 || mx + i >= c->width)
 354                             out[i] = 0;
 355                         else
 356                             out[i] = tprev[i];
 357                     }
 358                 }
 359                 out += c->width;
 360                 tprev += c->width;
 361             }
 362
 363             if (d) { /* apply XOR'ed difference */
 364                 out = output + x;
 365                 for (j = 0; j < bh2; j++){
 366                     for (i = 0; i < bw2; i++) {
 367                         out[i] ^= *((uint32_t *) src);
 368                         src += 4;
 369                     }
 370                     out += c->width;
 371                 }
 372             }
 373         }
 374         output += c->width * c->bh;
 375         prev   += c->width * c->bh;
 376     }
 377     if (src - c->decomp_buf != c->decomp_len)
 378         av_log(c->avctx, AV_LOG_ERROR, "Used %ti of %i bytes\n",
 379                src-c->decomp_buf, c->decomp_len);
 380     return 0;
 381 }
 382
 383 /**
 384  * Decode intraframe
 385  */
 386 static int zmbv_decode_intra(ZmbvContext *c)
 387 {
 388     uint8_t *src = c->decomp_buf;
 389
 390     /* make the palette available on the way out */
 391     if (c->fmt == ZMBV_FMT_8BPP) {
 392         memcpy(c->pal, src, 768);
 393         src += 768;
 394     }
 395
 396     memcpy(c->cur, src, c->width * c->height * (c->bpp / 8));
 397     return 0;
 398 }
 399
 400 static int decode_frame(AVCodecContext *avctx, void *data, int *got_frame, AVPacket *avpkt)
 401 {
 402     AVFrame *frame = data;
 403     const uint8_t *buf = avpkt->data;
 404     int buf_size = avpkt->size;
 405     ZmbvContext * const c = avctx->priv_data;
 406     int zret = Z_OK; // Zlib return code
 407     int len = buf_size;
 408     int hi_ver, lo_ver, ret;
 409     uint8_t *tmp;
 410
 411     if ((ret = ff_get_buffer(avctx, frame, 0)) < 0) {
 412         av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
 413         return ret;
 414     }
 415
 416     /* parse header */
 417     c->flags = buf[0];
 418     buf++; len--;
 419     if (c->flags & ZMBV_KEYFRAME) {
 420         hi_ver = buf[0];
 421         lo_ver = buf[1];
 422         c->comp = buf[2];
 423         c->fmt = buf[3];
 424         c->bw = buf[4];
 425         c->bh = buf[5];
 426         c->decode_intra = NULL;
 427         c->decode_xor = NULL;
 428
 429         buf += 6;
 430         len -= 6;
 431         av_log(avctx, AV_LOG_DEBUG,
 432                "Flags=%X ver=%i.%i comp=%i fmt=%i blk=%ix%i\n",
 433                c->flags,hi_ver,lo_ver,c->comp,c->fmt,c->bw,c->bh);
 434         if (hi_ver != 0 || lo_ver != 1) {
 435             avpriv_request_sample(avctx, "Version %i.%i", hi_ver, lo_ver);
 436             return AVERROR_PATCHWELCOME;
 437         }
 438         if (c->bw == 0 || c->bh == 0) {
 439             avpriv_request_sample(avctx, "Block size %ix%i", c->bw, c->bh);
 440             return AVERROR_PATCHWELCOME;
 441         }
 442         if (c->comp != 0 && c->comp != 1) {
 443             avpriv_request_sample(avctx, "Compression type %i", c->comp);
 444             return AVERROR_PATCHWELCOME;
 445         }
 446
 447         switch (c->fmt) {
 448         case ZMBV_FMT_8BPP:
 449             c->bpp = 8;
 450             c->decode_intra = zmbv_decode_intra;
 451             c->decode_xor = zmbv_decode_xor_8;
 452             break;
 453         case ZMBV_FMT_15BPP:
 454         case ZMBV_FMT_16BPP:
 455             c->bpp = 16;
 456             c->decode_intra = zmbv_decode_intra;
 457             c->decode_xor = zmbv_decode_xor_16;
 458             break;
 459 #ifdef ZMBV_ENABLE_24BPP
 460         case ZMBV_FMT_24BPP:
 461             c->bpp = 24;
 462             c->decode_intra = zmbv_decode_intra;
 463             c->decode_xor = zmbv_decode_xor_24;
 464             break;
 465 #endif //ZMBV_ENABLE_24BPP
 466         case ZMBV_FMT_32BPP:
 467             c->bpp = 32;
 468             c->decode_intra = zmbv_decode_intra;
 469             c->decode_xor = zmbv_decode_xor_32;
 470             break;
 471         default:
 472             c->decode_intra = NULL;
 473             c->decode_xor = NULL;
 474             avpriv_request_sample(avctx, "Format %i", c->fmt);
 475             return AVERROR_PATCHWELCOME;
 476         }
 477
 478         zret = inflateReset(&c->zstream);
 479         if (zret != Z_OK) {
 480             av_log(avctx, AV_LOG_ERROR, "Inflate reset error: %d\n", zret);
 481             return AVERROR_UNKNOWN;
 482         }
 483
 484         tmp = av_realloc(c->cur,  avctx->width * avctx->height * (c->bpp / 8));
 485         if (!tmp)
 486             return AVERROR(ENOMEM);
 487         c->cur = tmp;
 488         tmp = av_realloc(c->prev, avctx->width * avctx->height * (c->bpp / 8));
 489         if (!tmp)
 490             return AVERROR(ENOMEM);
 491         c->prev = tmp;
 492         c->bx   = (c->width  + c->bw - 1) / c->bw;
 493         c->by   = (c->height + c->bh - 1) / c->bh;
 494     }
 495
 496     if (!c->decode_intra) {
 497         av_log(avctx, AV_LOG_ERROR, "Error! Got no format or no keyframe!\n");
 498         return AVERROR_INVALIDDATA;
 499     }
 500
 501     if (c->comp == 0) { // uncompressed data
 502         if (c->decomp_size < len) {
 503             av_log(avctx, AV_LOG_ERROR, "Buffer too small\n");
 504             return AVERROR_INVALIDDATA;
 505         }
 506         memcpy(c->decomp_buf, buf, len);
 507     } else { // ZLIB-compressed data
 508         c->zstream.total_in = c->zstream.total_out = 0;
 509         c->zstream.next_in = buf;
 510         c->zstream.avail_in = len;
 511         c->zstream.next_out = c->decomp_buf;
 512         c->zstream.avail_out = c->decomp_size;
 513         zret = inflate(&c->zstream, Z_SYNC_FLUSH);
 514         if (zret != Z_OK && zret != Z_STREAM_END) {
 515             av_log(avctx, AV_LOG_ERROR, "inflate error %d\n", zret);
 516             return AVERROR_INVALIDDATA;
 517         }
 518         c->decomp_len = c->zstream.total_out;
 519     }
 520     if (c->flags & ZMBV_KEYFRAME) {
 521         frame->key_frame = 1;
 522         frame->pict_type = AV_PICTURE_TYPE_I;
 523         c->decode_intra(c);
 524     } else {
 525         frame->key_frame = 0;
 526         frame->pict_type = AV_PICTURE_TYPE_P;
 527         if (c->decomp_len)
 528             c->decode_xor(c);
 529     }
 530
 531     /* update frames */
 532     {
 533         uint8_t *out, *src;
 534         int i, j;
 535
 536         out = frame->data[0];
 537         src = c->cur;
 538         switch (c->fmt) {
 539         case ZMBV_FMT_8BPP:
 540             for (j = 0; j < c->height; j++) {
 541                 for (i = 0; i < c->width; i++) {
 542                     out[i * 3 + 0] = c->pal[(*src) * 3 + 0];
 543                     out[i * 3 + 1] = c->pal[(*src) * 3 + 1];
 544                     out[i * 3 + 2] = c->pal[(*src) * 3 + 2];
 545                     src++;
 546                 }
 547                 out += frame->linesize[0];
 548             }
 549             break;
 550         case ZMBV_FMT_15BPP:
 551             for (j = 0; j < c->height; j++) {
 552                 for (i = 0; i < c->width; i++) {
 553                     uint16_t tmp = AV_RL16(src);
 554                     src += 2;
 555                     out[i * 3 + 0] = (tmp & 0x7C00) >> 7;
 556                     out[i * 3 + 1] = (tmp & 0x03E0) >> 2;
 557                     out[i * 3 + 2] = (tmp & 0x001F) << 3;
 558                 }
 559                 out += frame->linesize[0];
 560             }
 561             break;
 562         case ZMBV_FMT_16BPP:
 563             for (j = 0; j < c->height; j++) {
 564                 for (i = 0; i < c->width; i++) {
 565                     uint16_t tmp = AV_RL16(src);
 566                     src += 2;
 567                     out[i * 3 + 0] = (tmp & 0xF800) >> 8;
 568                     out[i * 3 + 1] = (tmp & 0x07E0) >> 3;
 569                     out[i * 3 + 2] = (tmp & 0x001F) << 3;
 570                 }
 571                 out += frame->linesize[0];
 572             }
 573             break;
 574 #ifdef ZMBV_ENABLE_24BPP
 575         case ZMBV_FMT_24BPP:
 576             for (j = 0; j < c->height; j++) {
 577                 memcpy(out, src, c->width * 3);
 578                 src += c->width * 3;
 579                 out += frame->linesize[0];
 580             }
 581             break;
 582 #endif //ZMBV_ENABLE_24BPP
 583         case ZMBV_FMT_32BPP:
 584             for (j = 0; j < c->height; j++) {
 585                 for (i = 0; i < c->width; i++) {
 586                     uint32_t tmp = AV_RL32(src);
 587                     src += 4;
 588                     AV_WB24(out+(i*3), tmp);
 589                 }
 590                 out += frame->linesize[0];
 591             }
 592             break;
 593         default:
 594             av_log(avctx, AV_LOG_ERROR, "Cannot handle format %i\n", c->fmt);
 595         }
 596         FFSWAP(uint8_t *, c->cur, c->prev);
 597     }
 598     *got_frame = 1;
 599
 600     /* always report that the buffer was completely consumed */
 601     return buf_size;
 602 }
 603
 604 static av_cold int decode_init(AVCodecContext *avctx)
 605 {
 606     ZmbvContext * const c = avctx->priv_data;
 607     int zret; // Zlib return code
 608
 609     c->avctx = avctx;
 610
 611     c->width = avctx->width;
 612     c->height = avctx->height;
 613
 614     c->bpp = avctx->bits_per_coded_sample;
 615
 616     // Needed if zlib unused or init aborted before inflateInit
 617     memset(&c->zstream, 0, sizeof(z_stream));
 618
 619     avctx->pix_fmt = AV_PIX_FMT_RGB24;
 620     c->decomp_size = (avctx->width + 255) * 4 * (avctx->height + 64);
 621
 622     /* Allocate decompression buffer */
 623     if (c->decomp_size) {
 624         if (!(c->decomp_buf = av_malloc(c->decomp_size))) {
 625             av_log(avctx, AV_LOG_ERROR,
 626                    "Can't allocate decompression buffer.\n");
 627             return AVERROR(ENOMEM);
 628         }
 629     }
 630
 631     c->zstream.zalloc = Z_NULL;
 632     c->zstream.zfree = Z_NULL;
 633     c->zstream.opaque = Z_NULL;
 634     zret = inflateInit(&c->zstream);
 635     if (zret != Z_OK) {
 636         av_log(avctx, AV_LOG_ERROR, "Inflate init error: %d\n", zret);
 637         return AVERROR_UNKNOWN;
 638     }
 639
 640     return 0;
 641 }
 642
 643 static av_cold int decode_end(AVCodecContext *avctx)
 644 {
 645     ZmbvContext * const c = avctx->priv_data;
 646
 647     av_freep(&c->decomp_buf);
 648
 649     inflateEnd(&c->zstream);
 650     av_freep(&c->cur);
 651     av_freep(&c->prev);
 652
 653     return 0;
 654 }
 655
 656 AVCodec ff_zmbv_decoder = {
 657     .name           = "zmbv",
 658     .long_name      = NULL_IF_CONFIG_SMALL("Zip Motion Blocks Video"),
 659     .type           = AVMEDIA_TYPE_VIDEO,
 660     .id             = AV_CODEC_ID_ZMBV,
 661     .priv_data_size = sizeof(ZmbvContext),
 662     .init           = decode_init,
 663     .close          = decode_end,
 664     .decode         = decode_frame,
 665     .capabilities   = AV_CODEC_CAP_DR1,
 666 };