extern/ffmpeg/libavcodec/zmbv.c

   1 /*
   2  * Zip Motion Blocks Video (ZMBV) decoder
   3  * Copyright (c) 2006 Konstantin Shishkov
   4  *
   5  * This library is free software; you can redistribute it and/or
   6  * modify it under the terms of the GNU Lesser General Public
   7  * License as published by the Free Software Foundation; either
   8  * version 2 of the License, or (at your option) any later version.
   9  *
  10  * This library is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13  * Lesser General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU Lesser General Public
  16  * License along with this library; if not, write to the Free Software
  17  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  18  *
  19  */
  20
  21 /**
  22  * @file zmbv.c
  23  * Zip Motion Blocks Video decoder
  24  */
  25
  26 #include <stdio.h>
  27 #include <stdlib.h>
  28
  29 #include "common.h"
  30 #include "avcodec.h"
  31
  32 #ifdef CONFIG_ZLIB
  33 #include <zlib.h>
  34 #endif
  35
  36 #define ZMBV_KEYFRAME 1
  37 #define ZMBV_DELTAPAL 2
  38
  39 enum ZmbvFormat {
  40     ZMBV_FMT_NONE  = 0,
  41     ZMBV_FMT_1BPP  = 1,
  42     ZMBV_FMT_2BPP  = 2,
  43     ZMBV_FMT_4BPP  = 3,
  44     ZMBV_FMT_8BPP  = 4,
  45     ZMBV_FMT_15BPP = 5,
  46     ZMBV_FMT_16BPP = 6,
  47     ZMBV_FMT_24BPP = 7,
  48     ZMBV_FMT_32BPP = 8
  49 };
  50
  51 /*
  52  * Decoder context
  53  */
  54 typedef struct ZmbvContext {
  55     AVCodecContext *avctx;
  56     AVFrame pic;
  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 #ifdef CONFIG_ZLIB
  70     z_stream zstream;
  71 #endif
  72     int (*decode_intra)(struct ZmbvContext *c);
  73     int (*decode_xor)(struct ZmbvContext *c);
  74 } ZmbvContext;
  75
  76 /**
  77  * Decode XOR'ed frame - 8bpp version
  78  */
  79
  80 static int zmbv_decode_xor_8(ZmbvContext *c)
  81 {
  82     uint8_t *src = c->decomp_buf;
  83     uint8_t *output, *prev;
  84     int8_t *mvec;
  85     int x, y;
  86     int d, dx, dy, bw2, bh2;
  87     int block;
  88     int i, j;
  89     int mx, my;
  90
  91     output = c->cur;
  92     prev = c->prev;
  93
  94     if(c->flags & ZMBV_DELTAPAL){
  95         for(i = 0; i < 768; i++)
  96             c->pal[i] ^= *src++;
  97     }
  98
  99     mvec = (int8_t*)src;
 100     src += ((c->bx * c->by * 2 + 3) & ~3);
 101
 102     block = 0;
 103     for(y = 0; y < c->height; y += c->bh) {
 104         bh2 = ((c->height - y) > c->bh) ? c->bh : (c->height - y);
 105         for(x = 0; x < c->width; x += c->bw) {
 106             uint8_t *out, *tprev;
 107
 108             d = mvec[block] & 1;
 109             dx = mvec[block] >> 1;
 110             dy = mvec[block + 1] >> 1;
 111             block += 2;
 112
 113             bw2 = ((c->width - x) > c->bw) ? c->bw : (c->width - x);
 114
 115             /* copy block - motion vectors out of bounds are used to zero blocks */
 116             out = output + x;
 117             tprev = prev + x + dx + dy * c->width;
 118             mx = x + dx;
 119             my = y + dy;
 120             for(j = 0; j < bh2; j++){
 121                 if((my + j < 0) || (my + j >= c->height)) {
 122                     memset(out, 0, bw2);
 123                 } else {
 124                     for(i = 0; i < bw2; i++){
 125                         if((mx + i < 0) || (mx + i >= c->width))
 126                             out[i] = 0;
 127                         else
 128                             out[i] = tprev[i];
 129                     }
 130                 }
 131                 out += c->width;
 132                 tprev += c->width;
 133             }
 134
 135             if(d) { /* apply XOR'ed difference */
 136                 out = output + x;
 137                 for(j = 0; j < bh2; j++){
 138                     for(i = 0; i < bw2; i++)
 139                         out[i] ^= *src++;
 140                     out += c->width;
 141                 }
 142             }
 143         }
 144         output += c->width * c->bh;
 145         prev += c->width * c->bh;
 146     }
 147     if(src - c->decomp_buf != c->decomp_len)
 148         av_log(c->avctx, AV_LOG_ERROR, "Used %i of %i bytes\n", src-c->decomp_buf, c->decomp_len);
 149     return 0;
 150 }
 151
 152 /**
 153  * Decode XOR'ed frame - 15bpp and 16bpp version
 154  */
 155
 156 static int zmbv_decode_xor_16(ZmbvContext *c)
 157 {
 158     uint8_t *src = c->decomp_buf;
 159     uint16_t *output, *prev;
 160     int8_t *mvec;
 161     int x, y;
 162     int d, dx, dy, bw2, bh2;
 163     int block;
 164     int i, j;
 165     int mx, my;
 166
 167     output = (uint16_t*)c->cur;
 168     prev = (uint16_t*)c->prev;
 169
 170     mvec = (int8_t*)src;
 171     src += ((c->bx * c->by * 2 + 3) & ~3);
 172
 173     block = 0;
 174     for(y = 0; y < c->height; y += c->bh) {
 175         bh2 = ((c->height - y) > c->bh) ? c->bh : (c->height - y);
 176         for(x = 0; x < c->width; x += c->bw) {
 177             uint16_t *out, *tprev;
 178
 179             d = mvec[block] & 1;
 180             dx = mvec[block] >> 1;
 181             dy = mvec[block + 1] >> 1;
 182             block += 2;
 183
 184             bw2 = ((c->width - x) > c->bw) ? c->bw : (c->width - x);
 185
 186             /* copy block - motion vectors out of bounds are used to zero blocks */
 187             out = output + x;
 188             tprev = prev + x + dx + dy * c->width;
 189             mx = x + dx;
 190             my = y + dy;
 191             for(j = 0; j < bh2; j++){
 192                 if((my + j < 0) || (my + j >= c->height)) {
 193                     memset(out, 0, bw2 * 2);
 194                 } else {
 195                     for(i = 0; i < bw2; i++){
 196                         if((mx + i < 0) || (mx + i >= c->width))
 197                             out[i] = 0;
 198                         else
 199                             out[i] = tprev[i];
 200                     }
 201                 }
 202                 out += c->width;
 203                 tprev += c->width;
 204             }
 205
 206             if(d) { /* apply XOR'ed difference */
 207                 out = output + x;
 208                 for(j = 0; j < bh2; j++){
 209                     for(i = 0; i < bw2; i++) {
 210                         out[i] ^= *((uint16_t*)src);
 211                         src += 2;
 212                     }
 213                     out += c->width;
 214                 }
 215             }
 216         }
 217         output += c->width * c->bh;
 218         prev += c->width * c->bh;
 219     }
 220     if(src - c->decomp_buf != c->decomp_len)
 221         av_log(c->avctx, AV_LOG_ERROR, "Used %i of %i bytes\n", 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", src-c->decomp_buf, c->decomp_len);
 304     return 0;
 305 }
 306 #endif //ZMBV_ENABLE_24BPP
 307
 308 /**
 309  * Decode XOR'ed frame - 32bpp version
 310  */
 311
 312 static int zmbv_decode_xor_32(ZmbvContext *c)
 313 {
 314     uint8_t *src = c->decomp_buf;
 315     uint32_t *output, *prev;
 316     int8_t *mvec;
 317     int x, y;
 318     int d, dx, dy, bw2, bh2;
 319     int block;
 320     int i, j;
 321     int mx, my;
 322
 323     output = (uint32_t*)c->cur;
 324     prev = (uint32_t*)c->prev;
 325
 326     mvec = (int8_t*)src;
 327     src += ((c->bx * c->by * 2 + 3) & ~3);
 328
 329     block = 0;
 330     for(y = 0; y < c->height; y += c->bh) {
 331         bh2 = ((c->height - y) > c->bh) ? c->bh : (c->height - y);
 332         for(x = 0; x < c->width; x += c->bw) {
 333             uint32_t *out, *tprev;
 334
 335             d = mvec[block] & 1;
 336             dx = mvec[block] >> 1;
 337             dy = mvec[block + 1] >> 1;
 338             block += 2;
 339
 340             bw2 = ((c->width - x) > c->bw) ? c->bw : (c->width - x);
 341
 342             /* copy block - motion vectors out of bounds are used to zero blocks */
 343             out = output + x;
 344             tprev = prev + x + dx + dy * c->width;
 345             mx = x + dx;
 346             my = y + dy;
 347             for(j = 0; j < bh2; j++){
 348                 if((my + j < 0) || (my + j >= c->height)) {
 349                     memset(out, 0, bw2 * 4);
 350                 } else {
 351                     for(i = 0; i < bw2; i++){
 352                         if((mx + i < 0) || (mx + i >= c->width))
 353                             out[i] = 0;
 354                         else
 355                             out[i] = tprev[i];
 356                     }
 357                 }
 358                 out += c->width;
 359                 tprev += c->width;
 360             }
 361
 362             if(d) { /* apply XOR'ed difference */
 363                 out = output + x;
 364                 for(j = 0; j < bh2; j++){
 365                     for(i = 0; i < bw2; i++) {
 366                         out[i] ^= *((uint32_t*)src);
 367                         src += 4;
 368                     }
 369                     out += c->width;
 370                 }
 371             }
 372         }
 373         output += c->width * c->bh;
 374         prev += c->width * c->bh;
 375     }
 376     if(src - c->decomp_buf != c->decomp_len)
 377         av_log(c->avctx, AV_LOG_ERROR, "Used %i of %i bytes\n", src-c->decomp_buf, c->decomp_len);
 378     return 0;
 379 }
 380
 381 /**
 382  * Decode intraframe
 383  */
 384 static int zmbv_decode_intra(ZmbvContext *c)
 385 {
 386     uint8_t *src = c->decomp_buf;
 387
 388     /* make the palette available on the way out */
 389     if (c->fmt == ZMBV_FMT_8BPP) {
 390         memcpy(c->pal, src, 768);
 391         src += 768;
 392     }
 393
 394     memcpy(c->cur, src, c->width * c->height * (c->bpp / 8));
 395     return 0;
 396 }
 397
 398 static int decode_frame(AVCodecContext *avctx, void *data, int *data_size, uint8_t *buf, int buf_size)
 399 {
 400     ZmbvContext * const c = (ZmbvContext *)avctx->priv_data;
 401     uint8_t *outptr;
 402 #ifdef CONFIG_ZLIB
 403     int zret = Z_OK; // Zlib return code
 404 #endif
 405     int len = buf_size;
 406     int hi_ver, lo_ver;
 407
 408     if(c->pic.data[0])
 409             avctx->release_buffer(avctx, &c->pic);
 410
 411     c->pic.reference = 1;
 412     c->pic.buffer_hints = FF_BUFFER_HINTS_VALID;
 413     if(avctx->get_buffer(avctx, &c->pic) < 0){
 414         av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
 415         return -1;
 416     }
 417
 418     outptr = c->pic.data[0]; // Output image pointer
 419
 420     /* parse header */
 421     c->flags = buf[0];
 422     buf++; len--;
 423     if(c->flags & ZMBV_KEYFRAME) {
 424         hi_ver = buf[0];
 425         lo_ver = buf[1];
 426         c->comp = buf[2];
 427         c->fmt = buf[3];
 428         c->bw = buf[4];
 429         c->bh = buf[5];
 430
 431         buf += 6;
 432         len -= 6;
 433         av_log(avctx, AV_LOG_DEBUG, "Flags=%X ver=%i.%i comp=%i fmt=%i blk=%ix%i\n",c->flags,hi_ver,lo_ver,c->comp,c->fmt,c->bw,c->bh);
 434         if(hi_ver != 0 || lo_ver != 1) {
 435             av_log(avctx, AV_LOG_ERROR, "Unsupported version %i.%i\n", hi_ver, lo_ver);
 436             return -1;
 437         }
 438         if(c->bw == 0 || c->bh == 0) {
 439             av_log(avctx, AV_LOG_ERROR, "Unsupported block size %ix%i\n", c->bw, c->bh);
 440         }
 441         if(c->comp != 0 && c->comp != 1) {
 442             av_log(avctx, AV_LOG_ERROR, "Unsupported compression type %i\n", c->comp);
 443             return -1;
 444         }
 445
 446         switch(c->fmt) {
 447         case ZMBV_FMT_8BPP:
 448             c->bpp = 8;
 449             c->decode_intra = zmbv_decode_intra;
 450             c->decode_xor = zmbv_decode_xor_8;
 451             break;
 452         case ZMBV_FMT_15BPP:
 453         case ZMBV_FMT_16BPP:
 454             c->bpp = 16;
 455             c->decode_intra = zmbv_decode_intra;
 456             c->decode_xor = zmbv_decode_xor_16;
 457             break;
 458 #ifdef ZMBV_ENABLE_24BPP
 459         case ZMBV_FMT_24BPP:
 460             c->bpp = 24;
 461             c->decode_intra = zmbv_decode_intra;
 462             c->decode_xor = zmbv_decode_xor_24;
 463             break;
 464 #endif //ZMBV_ENABLE_24BPP
 465         case ZMBV_FMT_32BPP:
 466             c->bpp = 32;
 467             c->decode_intra = zmbv_decode_intra;
 468             c->decode_xor = zmbv_decode_xor_32;
 469             break;
 470         default:
 471             c->decode_intra = NULL;
 472             c->decode_xor = NULL;
 473             av_log(avctx, AV_LOG_ERROR, "Unsupported (for now) format %i\n", c->fmt);
 474             return -1;
 475         }
 476 #ifdef CONFIG_ZLIB
 477         zret = inflateReset(&c->zstream);
 478         if (zret != Z_OK) {
 479             av_log(avctx, AV_LOG_ERROR, "Inflate reset error: %d\n", zret);
 480             return -1;
 481         }
 482 #else
 483         av_log(avctx, AV_LOG_ERROR, "BUG! Zlib support not compiled in frame decoder.\n");
 484         return -1;
 485 #endif  /* CONFIG_ZLIB */
 486         c->cur = av_realloc(c->cur, avctx->width * avctx->height * (c->bpp / 8));
 487         c->prev = av_realloc(c->prev, avctx->width * avctx->height * (c->bpp / 8));
 488         c->bx = (c->width + c->bw - 1) / c->bw;
 489         c->by = (c->height+ c->bh - 1) / c->bh;
 490     }
 491
 492     if(c->decode_intra == NULL) {
 493         av_log(avctx, AV_LOG_ERROR, "Error! Got no format or no keyframe!\n");
 494         return -1;
 495     }
 496
 497     if(c->comp == 0) { //Uncompressed data
 498         memcpy(c->decomp_buf, buf, len);
 499         c->decomp_size = 1;
 500     } else { // ZLIB-compressed data
 501 #ifdef CONFIG_ZLIB
 502         c->zstream.total_in = c->zstream.total_out = 0;
 503         c->zstream.next_in = buf;
 504         c->zstream.avail_in = len;
 505         c->zstream.next_out = c->decomp_buf;
 506         c->zstream.avail_out = c->decomp_size;
 507         inflate(&c->zstream, Z_FINISH);
 508         c->decomp_len = c->zstream.total_out;
 509 #else
 510         av_log(avctx, AV_LOG_ERROR, "BUG! Zlib support not compiled in frame decoder.\n");
 511         return -1;
 512 #endif
 513     }
 514     if(c->flags & ZMBV_KEYFRAME) {
 515         c->pic.key_frame = 1;
 516         c->pic.pict_type = FF_I_TYPE;
 517         c->decode_intra(c);
 518     } else {
 519         c->pic.key_frame = 0;
 520         c->pic.pict_type = FF_P_TYPE;
 521         c->decode_xor(c);
 522     }
 523
 524     /* update frames */
 525     {
 526         uint8_t *out, *src;
 527         int i, j;
 528
 529         out = c->pic.data[0];
 530         src = c->cur;
 531         switch(c->fmt) {
 532         case ZMBV_FMT_8BPP:
 533             for(j = 0; j < c->height; j++) {
 534                 for(i = 0; i < c->width; i++) {
 535                     out[i * 3 + 0] = c->pal[(*src) * 3 + 0];
 536                     out[i * 3 + 1] = c->pal[(*src) * 3 + 1];
 537                     out[i * 3 + 2] = c->pal[(*src) * 3 + 2];
 538                     *src++;
 539                 }
 540                 out += c->pic.linesize[0];
 541             }
 542             break;
 543         case ZMBV_FMT_15BPP:
 544             for(j = 0; j < c->height; j++) {
 545                 for(i = 0; i < c->width; i++) {
 546                     uint16_t tmp = LE_16(src);
 547                     src += 2;
 548                     out[i * 3 + 0] = (tmp & 0x7C00) >> 7;
 549                     out[i * 3 + 1] = (tmp & 0x03E0) >> 2;
 550                     out[i * 3 + 2] = (tmp & 0x001F) << 3;
 551                 }
 552                 out += c->pic.linesize[0];
 553             }
 554             break;
 555         case ZMBV_FMT_16BPP:
 556             for(j = 0; j < c->height; j++) {
 557                 for(i = 0; i < c->width; i++) {
 558                     uint16_t tmp = LE_16(src);
 559                     src += 2;
 560                     out[i * 3 + 0] = (tmp & 0xF800) >> 8;
 561                     out[i * 3 + 1] = (tmp & 0x07E0) >> 3;
 562                     out[i * 3 + 2] = (tmp & 0x001F) << 3;
 563                 }
 564                 out += c->pic.linesize[0];
 565             }
 566             break;
 567 #ifdef ZMBV_ENABLE_24BPP
 568         case ZMBV_FMT_24BPP:
 569             for(j = 0; j < c->height; j++) {
 570                 memcpy(out, src, c->width * 3);
 571                 src += c->width * 3;
 572                 out += c->pic.linesize[0];
 573             }
 574             break;
 575 #endif //ZMBV_ENABLE_24BPP
 576         case ZMBV_FMT_32BPP:
 577             for(j = 0; j < c->height; j++) {
 578                 for(i = 0; i < c->width; i++) {
 579                     uint32_t tmp = LE_32(src);
 580                     src += 4;
 581                     out[i * 3 + 0] = tmp >> 16;
 582                     out[i * 3 + 1] = tmp >> 8;
 583                     out[i * 3 + 2] = tmp >> 0;
 584                 }
 585                 out += c->pic.linesize[0];
 586             }
 587             break;
 588         default:
 589             av_log(avctx, AV_LOG_ERROR, "Cannot handle format %i\n", c->fmt);
 590         }
 591         memcpy(c->prev, c->cur, c->width * c->height * (c->bpp / 8));
 592     }
 593     *data_size = sizeof(AVFrame);
 594     *(AVFrame*)data = c->pic;
 595
 596     /* always report that the buffer was completely consumed */
 597     return buf_size;
 598 }
 599
 600
 601
 602 /*
 603  *
 604  * Init zmbv decoder
 605  *
 606  */
 607 static int decode_init(AVCodecContext *avctx)
 608 {
 609     ZmbvContext * const c = (ZmbvContext *)avctx->priv_data;
 610     int zret; // Zlib return code
 611
 612     c->avctx = avctx;
 613     avctx->has_b_frames = 0;
 614
 615     c->pic.data[0] = NULL;
 616     c->width = avctx->width;
 617     c->height = avctx->height;
 618
 619     if (avcodec_check_dimensions(avctx, avctx->height, avctx->width) < 0) {
 620         return 1;
 621     }
 622     c->bpp = avctx->bits_per_sample;
 623
 624 #ifdef CONFIG_ZLIB
 625     // Needed if zlib unused or init aborted before inflateInit
 626     memset(&(c->zstream), 0, sizeof(z_stream));
 627 #else
 628     av_log(avctx, AV_LOG_ERROR, "Zlib support not compiled.\n");
 629     return 1;
 630 #endif
 631     avctx->pix_fmt = PIX_FMT_RGB24;
 632     c->decomp_size = (avctx->width + 255) * 4 * (avctx->height + 64);
 633
 634     /* Allocate decompression buffer */
 635     if (c->decomp_size) {
 636         if ((c->decomp_buf = av_malloc(c->decomp_size)) == NULL) {
 637             av_log(avctx, AV_LOG_ERROR, "Can't allocate decompression buffer.\n");
 638             return 1;
 639         }
 640     }
 641
 642 #ifdef CONFIG_ZLIB
 643     c->zstream.zalloc = Z_NULL;
 644     c->zstream.zfree = Z_NULL;
 645     c->zstream.opaque = Z_NULL;
 646     zret = inflateInit(&(c->zstream));
 647     if (zret != Z_OK) {
 648         av_log(avctx, AV_LOG_ERROR, "Inflate init error: %d\n", zret);
 649         return 1;
 650     }
 651 #endif
 652
 653     return 0;
 654 }
 655
 656
 657
 658 /*
 659  *
 660  * Uninit zmbv decoder
 661  *
 662  */
 663 static int decode_end(AVCodecContext *avctx)
 664 {
 665     ZmbvContext * const c = (ZmbvContext *)avctx->priv_data;
 666
 667     av_freep(&c->decomp_buf);
 668
 669     if (c->pic.data[0])
 670         avctx->release_buffer(avctx, &c->pic);
 671 #ifdef CONFIG_ZLIB
 672     inflateEnd(&(c->zstream));
 673 #endif
 674     if(c->cur)
 675         av_freep(&c->cur);
 676     if(c->prev)
 677         av_freep(&c->prev);
 678
 679     return 0;
 680 }
 681
 682 AVCodec zmbv_decoder = {
 683     "zmbv",
 684     CODEC_TYPE_VIDEO,
 685     CODEC_ID_ZMBV,
 686     sizeof(ZmbvContext),
 687     decode_init,
 688     NULL,
 689     decode_end,
 690     decode_frame
 691 };
 692