libavcodec/lcldec.c

   1 /*
   2  * LCL (LossLess Codec Library) Codec
   3  * Copyright (c) 2002-2004 Roberto Togni
   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 lcl.c
  24  * LCL (LossLess Codec Library) Video Codec
  25  * Decoder for MSZH and ZLIB codecs
  26  * Experimental encoder for ZLIB RGB24
  27  *
  28  * Fourcc: MSZH, ZLIB
  29  *
  30  * Original Win32 dll:
  31  * Ver2.23 By Kenji Oshima 2000.09.20
  32  * avimszh.dll, avizlib.dll
  33  *
  34  * A description of the decoding algorithm can be found here:
  35  *   http://www.pcisys.net/~melanson/codecs
  36  *
  37  * Supports: BGR24 (RGB 24bpp)
  38  *
  39  */
  40
  41 #include <stdio.h>
  42 #include <stdlib.h>
  43
  44 #include "avcodec.h"
  45 #include "bitstream.h"
  46 #include "lcl.h"
  47
  48 #ifdef CONFIG_ZLIB
  49 #include <zlib.h>
  50 #endif
  51
  52 /*
  53  * Decoder context
  54  */
  55 typedef struct LclDecContext {
  56
  57         AVCodecContext *avctx;
  58         AVFrame pic;
  59
  60     // Image type
  61     int imgtype;
  62     // Compression type
  63     int compression;
  64     // Flags
  65     int flags;
  66     // Decompressed data size
  67     unsigned int decomp_size;
  68     // Decompression buffer
  69     unsigned char* decomp_buf;
  70 #ifdef CONFIG_ZLIB
  71     z_stream zstream;
  72 #endif
  73 } LclDecContext;
  74
  75
  76 /*
  77  *
  78  * Helper functions
  79  *
  80  */
  81 static inline unsigned char fix (int pix14)
  82 {
  83     int tmp;
  84
  85     tmp = (pix14 + 0x80000) >> 20;
  86     if (tmp < 0)
  87         return 0;
  88     if (tmp > 255)
  89         return 255;
  90     return tmp;
  91 }
  92
  93
  94
  95 static inline unsigned char get_b (unsigned char yq, signed char bq)
  96 {
  97     return fix((yq << 20) + bq * 1858076);
  98 }
  99
 100
 101
 102 static inline unsigned char get_g (unsigned char yq, signed char bq, signed char rq)
 103 {
 104     return fix((yq << 20) - bq * 360857 - rq * 748830);
 105 }
 106
 107
 108
 109 static inline unsigned char get_r (unsigned char yq, signed char rq)
 110 {
 111     return fix((yq << 20) + rq * 1470103);
 112 }
 113
 114
 115
 116 static unsigned int mszh_decomp(unsigned char * srcptr, int srclen, unsigned char * destptr, unsigned int destsize)
 117 {
 118     unsigned char *destptr_bak = destptr;
 119     unsigned char *destptr_end = destptr + destsize;
 120     unsigned char mask = 0;
 121     unsigned char maskbit = 0;
 122     unsigned int ofs, cnt;
 123
 124     while ((srclen > 0) && (destptr < destptr_end)) {
 125         if (maskbit == 0) {
 126             mask = *(srcptr++);
 127             maskbit = 8;
 128             srclen--;
 129             continue;
 130         }
 131         if ((mask & (1 << (--maskbit))) == 0) {
 132             if (destptr + 4 > destptr_end)
 133                 break;
 134             *(int*)destptr = *(int*)srcptr;
 135             srclen -= 4;
 136             destptr += 4;
 137             srcptr += 4;
 138         } else {
 139             ofs = *(srcptr++);
 140             cnt = *(srcptr++);
 141             ofs += cnt * 256;;
 142             cnt = ((cnt >> 3) & 0x1f) + 1;
 143             ofs &= 0x7ff;
 144             srclen -= 2;
 145             cnt *= 4;
 146             if (destptr + cnt > destptr_end) {
 147                 cnt =  destptr_end - destptr;
 148             }
 149             for (; cnt > 0; cnt--) {
 150                 *(destptr) = *(destptr - ofs);
 151                 destptr++;
 152             }
 153         }
 154     }
 155
 156     return (destptr - destptr_bak);
 157 }
 158
 159
 160
 161 /*
 162  *
 163  * Decode a frame
 164  *
 165  */
 166 static int decode_frame(AVCodecContext *avctx, void *data, int *data_size, uint8_t *buf, int buf_size)
 167 {
 168         LclDecContext * const c = avctx->priv_data;
 169         unsigned char *encoded = (unsigned char *)buf;
 170     unsigned int pixel_ptr;
 171     int row, col;
 172     unsigned char *outptr;
 173     unsigned int width = avctx->width; // Real image width
 174     unsigned int height = avctx->height; // Real image height
 175     unsigned int mszh_dlen;
 176     unsigned char yq, y1q, uq, vq;
 177     int uqvq;
 178     unsigned int mthread_inlen, mthread_outlen;
 179 #ifdef CONFIG_ZLIB
 180     int zret; // Zlib return code
 181 #endif
 182     unsigned int len = buf_size;
 183
 184         if(c->pic.data[0])
 185                 avctx->release_buffer(avctx, &c->pic);
 186
 187         c->pic.reference = 0;
 188         c->pic.buffer_hints = FF_BUFFER_HINTS_VALID;
 189         if(avctx->get_buffer(avctx, &c->pic) < 0){
 190                 av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
 191                 return -1;
 192         }
 193
 194     outptr = c->pic.data[0]; // Output image pointer
 195
 196     /* Decompress frame */
 197     switch (avctx->codec_id) {
 198         case CODEC_ID_MSZH:
 199             switch (c->compression) {
 200                 case COMP_MSZH:
 201                     if (c->flags & FLAG_MULTITHREAD) {
 202                         mthread_inlen = *((unsigned int*)encoded);
 203                         mthread_outlen = *((unsigned int*)(encoded+4));
 204                         if (mthread_outlen > c->decomp_size) // this should not happen
 205                             mthread_outlen = c->decomp_size;
 206                         mszh_dlen = mszh_decomp(encoded + 8, mthread_inlen, c->decomp_buf, c->decomp_size);
 207                         if (mthread_outlen != mszh_dlen) {
 208                             av_log(avctx, AV_LOG_ERROR, "Mthread1 decoded size differs (%d != %d)\n",
 209                                    mthread_outlen, mszh_dlen);
 210                             return -1;
 211                         }
 212                         mszh_dlen = mszh_decomp(encoded + 8 + mthread_inlen, len - mthread_inlen,
 213                                                 c->decomp_buf + mthread_outlen, c->decomp_size - mthread_outlen);
 214                         if (mthread_outlen != mszh_dlen) {
 215                             av_log(avctx, AV_LOG_ERROR, "Mthread2 decoded size differs (%d != %d)\n",
 216                                    mthread_outlen, mszh_dlen);
 217                             return -1;
 218                         }
 219                         encoded = c->decomp_buf;
 220                         len = c->decomp_size;
 221                     } else {
 222                         mszh_dlen = mszh_decomp(encoded, len, c->decomp_buf, c->decomp_size);
 223                         if (c->decomp_size != mszh_dlen) {
 224                             av_log(avctx, AV_LOG_ERROR, "Decoded size differs (%d != %d)\n",
 225                                    c->decomp_size, mszh_dlen);
 226                             return -1;
 227                         }
 228                         encoded = c->decomp_buf;
 229                         len = mszh_dlen;
 230                     }
 231                     break;
 232                 case COMP_MSZH_NOCOMP:
 233                     break;
 234                 default:
 235                     av_log(avctx, AV_LOG_ERROR, "BUG! Unknown MSZH compression in frame decoder.\n");
 236                     return -1;
 237             }
 238             break;
 239         case CODEC_ID_ZLIB:
 240 #ifdef CONFIG_ZLIB
 241             /* Using the original dll with normal compression (-1) and RGB format
 242              * gives a file with ZLIB fourcc, but frame is really uncompressed.
 243              * To be sure that's true check also frame size */
 244             if ((c->compression == COMP_ZLIB_NORMAL) && (c->imgtype == IMGTYPE_RGB24) &&
 245                (len == width * height * 3))
 246                 break;
 247             zret = inflateReset(&(c->zstream));
 248             if (zret != Z_OK) {
 249                 av_log(avctx, AV_LOG_ERROR, "Inflate reset error: %d\n", zret);
 250                 return -1;
 251             }
 252             if (c->flags & FLAG_MULTITHREAD) {
 253                 mthread_inlen = *((unsigned int*)encoded);
 254                 mthread_outlen = *((unsigned int*)(encoded+4));
 255                 if (mthread_outlen > c->decomp_size)
 256                     mthread_outlen = c->decomp_size;
 257                 c->zstream.next_in = encoded + 8;
 258                 c->zstream.avail_in = mthread_inlen;
 259                 c->zstream.next_out = c->decomp_buf;
 260                 c->zstream.avail_out = c->decomp_size;
 261                 zret = inflate(&(c->zstream), Z_FINISH);
 262                 if ((zret != Z_OK) && (zret != Z_STREAM_END)) {
 263                     av_log(avctx, AV_LOG_ERROR, "Mthread1 inflate error: %d\n", zret);
 264                     return -1;
 265                 }
 266                 if (mthread_outlen != (unsigned int)(c->zstream.total_out)) {
 267                     av_log(avctx, AV_LOG_ERROR, "Mthread1 decoded size differs (%u != %lu)\n",
 268                            mthread_outlen, c->zstream.total_out);
 269                     return -1;
 270                 }
 271                 zret = inflateReset(&(c->zstream));
 272                 if (zret != Z_OK) {
 273                     av_log(avctx, AV_LOG_ERROR, "Mthread2 inflate reset error: %d\n", zret);
 274                     return -1;
 275                 }
 276                 c->zstream.next_in = encoded + 8 + mthread_inlen;
 277                 c->zstream.avail_in = len - mthread_inlen;
 278                 c->zstream.next_out = c->decomp_buf + mthread_outlen;
 279                 c->zstream.avail_out = c->decomp_size - mthread_outlen;
 280                 zret = inflate(&(c->zstream), Z_FINISH);
 281                 if ((zret != Z_OK) && (zret != Z_STREAM_END)) {
 282                     av_log(avctx, AV_LOG_ERROR, "Mthread2 inflate error: %d\n", zret);
 283                     return -1;
 284                 }
 285                 if (mthread_outlen != (unsigned int)(c->zstream.total_out)) {
 286                     av_log(avctx, AV_LOG_ERROR, "Mthread2 decoded size differs (%d != %lu)\n",
 287                            mthread_outlen, c->zstream.total_out);
 288                     return -1;
 289                 }
 290             } else {
 291                 c->zstream.next_in = encoded;
 292                 c->zstream.avail_in = len;
 293                 c->zstream.next_out = c->decomp_buf;
 294                 c->zstream.avail_out = c->decomp_size;
 295                 zret = inflate(&(c->zstream), Z_FINISH);
 296                 if ((zret != Z_OK) && (zret != Z_STREAM_END)) {
 297                     av_log(avctx, AV_LOG_ERROR, "Inflate error: %d\n", zret);
 298                     return -1;
 299                 }
 300                 if (c->decomp_size != (unsigned int)(c->zstream.total_out)) {
 301                     av_log(avctx, AV_LOG_ERROR, "Decoded size differs (%d != %lu)\n",
 302                            c->decomp_size, c->zstream.total_out);
 303                     return -1;
 304                 }
 305             }
 306             encoded = c->decomp_buf;
 307             len = c->decomp_size;;
 308 #else
 309             av_log(avctx, AV_LOG_ERROR, "BUG! Zlib support not compiled in frame decoder.\n");
 310             return -1;
 311 #endif
 312             break;
 313         default:
 314             av_log(avctx, AV_LOG_ERROR, "BUG! Unknown codec in frame decoder compression switch.\n");
 315             return -1;
 316     }
 317
 318
 319     /* Apply PNG filter */
 320     if ((avctx->codec_id == CODEC_ID_ZLIB) && (c->flags & FLAG_PNGFILTER)) {
 321         switch (c->imgtype) {
 322             case IMGTYPE_YUV111:
 323             case IMGTYPE_RGB24:
 324                 for (row = 0; row < height; row++) {
 325                     pixel_ptr = row * width * 3;
 326                     yq = encoded[pixel_ptr++];
 327                     uqvq = AV_RL16(encoded+pixel_ptr);
 328                     pixel_ptr += 2;
 329                     for (col = 1; col < width; col++) {
 330                         encoded[pixel_ptr] = yq -= encoded[pixel_ptr];
 331                         uqvq -= AV_RL16(encoded+pixel_ptr+1);
 332                         AV_WL16(encoded+pixel_ptr+1, uqvq);
 333                         pixel_ptr += 3;
 334                     }
 335                 }
 336                 break;
 337             case IMGTYPE_YUV422:
 338                 for (row = 0; row < height; row++) {
 339                     pixel_ptr = row * width * 2;
 340                     yq = uq = vq =0;
 341                     for (col = 0; col < width/4; col++) {
 342                         encoded[pixel_ptr] = yq -= encoded[pixel_ptr];
 343                         encoded[pixel_ptr+1] = yq -= encoded[pixel_ptr+1];
 344                         encoded[pixel_ptr+2] = yq -= encoded[pixel_ptr+2];
 345                         encoded[pixel_ptr+3] = yq -= encoded[pixel_ptr+3];
 346                         encoded[pixel_ptr+4] = uq -= encoded[pixel_ptr+4];
 347                         encoded[pixel_ptr+5] = uq -= encoded[pixel_ptr+5];
 348                         encoded[pixel_ptr+6] = vq -= encoded[pixel_ptr+6];
 349                         encoded[pixel_ptr+7] = vq -= encoded[pixel_ptr+7];
 350                         pixel_ptr += 8;
 351                     }
 352                 }
 353                 break;
 354             case IMGTYPE_YUV411:
 355                 for (row = 0; row < height; row++) {
 356                     pixel_ptr = row * width / 2 * 3;
 357                     yq = uq = vq =0;
 358                     for (col = 0; col < width/4; col++) {
 359                         encoded[pixel_ptr] = yq -= encoded[pixel_ptr];
 360                         encoded[pixel_ptr+1] = yq -= encoded[pixel_ptr+1];
 361                         encoded[pixel_ptr+2] = yq -= encoded[pixel_ptr+2];
 362                         encoded[pixel_ptr+3] = yq -= encoded[pixel_ptr+3];
 363                         encoded[pixel_ptr+4] = uq -= encoded[pixel_ptr+4];
 364                         encoded[pixel_ptr+5] = vq -= encoded[pixel_ptr+5];
 365                         pixel_ptr += 6;
 366                     }
 367                 }
 368                 break;
 369             case IMGTYPE_YUV211:
 370                 for (row = 0; row < height; row++) {
 371                     pixel_ptr = row * width * 2;
 372                     yq = uq = vq =0;
 373                     for (col = 0; col < width/2; col++) {
 374                         encoded[pixel_ptr] = yq -= encoded[pixel_ptr];
 375                         encoded[pixel_ptr+1] = yq -= encoded[pixel_ptr+1];
 376                         encoded[pixel_ptr+2] = uq -= encoded[pixel_ptr+2];
 377                         encoded[pixel_ptr+3] = vq -= encoded[pixel_ptr+3];
 378                         pixel_ptr += 4;
 379                     }
 380                 }
 381                 break;
 382             case IMGTYPE_YUV420:
 383                 for (row = 0; row < height/2; row++) {
 384                     pixel_ptr = row * width * 3;
 385                     yq = y1q = uq = vq =0;
 386                     for (col = 0; col < width/2; col++) {
 387                         encoded[pixel_ptr] = yq -= encoded[pixel_ptr];
 388                         encoded[pixel_ptr+1] = yq -= encoded[pixel_ptr+1];
 389                         encoded[pixel_ptr+2] = y1q -= encoded[pixel_ptr+2];
 390                         encoded[pixel_ptr+3] = y1q -= encoded[pixel_ptr+3];
 391                         encoded[pixel_ptr+4] = uq -= encoded[pixel_ptr+4];
 392                         encoded[pixel_ptr+5] = vq -= encoded[pixel_ptr+5];
 393                         pixel_ptr += 6;
 394                     }
 395                 }
 396                 break;
 397             default:
 398                 av_log(avctx, AV_LOG_ERROR, "BUG! Unknown imagetype in pngfilter switch.\n");
 399                 return -1;
 400         }
 401     }
 402
 403     /* Convert colorspace */
 404     switch (c->imgtype) {
 405         case IMGTYPE_YUV111:
 406             for (row = height - 1; row >= 0; row--) {
 407                 pixel_ptr = row * c->pic.linesize[0];
 408                 for (col = 0; col < width; col++) {
 409                     outptr[pixel_ptr++] = get_b(encoded[0], encoded[1]);
 410                     outptr[pixel_ptr++] = get_g(encoded[0], encoded[1], encoded[2]);
 411                     outptr[pixel_ptr++] = get_r(encoded[0], encoded[2]);
 412                     encoded += 3;
 413                 }
 414             }
 415             break;
 416         case IMGTYPE_YUV422:
 417             for (row = height - 1; row >= 0; row--) {
 418                 pixel_ptr = row * c->pic.linesize[0];
 419                 for (col = 0; col < width/4; col++) {
 420                     outptr[pixel_ptr++] = get_b(encoded[0], encoded[4]);
 421                     outptr[pixel_ptr++] = get_g(encoded[0], encoded[4], encoded[6]);
 422                     outptr[pixel_ptr++] = get_r(encoded[0], encoded[6]);
 423                     outptr[pixel_ptr++] = get_b(encoded[1], encoded[4]);
 424                     outptr[pixel_ptr++] = get_g(encoded[1], encoded[4], encoded[6]);
 425                     outptr[pixel_ptr++] = get_r(encoded[1], encoded[6]);
 426                     outptr[pixel_ptr++] = get_b(encoded[2], encoded[5]);
 427                     outptr[pixel_ptr++] = get_g(encoded[2], encoded[5], encoded[7]);
 428                     outptr[pixel_ptr++] = get_r(encoded[2], encoded[7]);
 429                     outptr[pixel_ptr++] = get_b(encoded[3], encoded[5]);
 430                     outptr[pixel_ptr++] = get_g(encoded[3], encoded[5], encoded[7]);
 431                     outptr[pixel_ptr++] = get_r(encoded[3], encoded[7]);
 432                     encoded += 8;
 433                 }
 434             }
 435             break;
 436         case IMGTYPE_RGB24:
 437             for (row = height - 1; row >= 0; row--) {
 438                 pixel_ptr = row * c->pic.linesize[0];
 439                 for (col = 0; col < width; col++) {
 440                     outptr[pixel_ptr++] = encoded[0];
 441                     outptr[pixel_ptr++] = encoded[1];
 442                     outptr[pixel_ptr++] = encoded[2];
 443                     encoded += 3;
 444                 }
 445             }
 446             break;
 447         case IMGTYPE_YUV411:
 448             for (row = height - 1; row >= 0; row--) {
 449                 pixel_ptr = row * c->pic.linesize[0];
 450                 for (col = 0; col < width/4; col++) {
 451                     outptr[pixel_ptr++] = get_b(encoded[0], encoded[4]);
 452                     outptr[pixel_ptr++] = get_g(encoded[0], encoded[4], encoded[5]);
 453                     outptr[pixel_ptr++] = get_r(encoded[0], encoded[5]);
 454                     outptr[pixel_ptr++] = get_b(encoded[1], encoded[4]);
 455                     outptr[pixel_ptr++] = get_g(encoded[1], encoded[4], encoded[5]);
 456                     outptr[pixel_ptr++] = get_r(encoded[1], encoded[5]);
 457                     outptr[pixel_ptr++] = get_b(encoded[2], encoded[4]);
 458                     outptr[pixel_ptr++] = get_g(encoded[2], encoded[4], encoded[5]);
 459                     outptr[pixel_ptr++] = get_r(encoded[2], encoded[5]);
 460                     outptr[pixel_ptr++] = get_b(encoded[3], encoded[4]);
 461                     outptr[pixel_ptr++] = get_g(encoded[3], encoded[4], encoded[5]);
 462                     outptr[pixel_ptr++] = get_r(encoded[3], encoded[5]);
 463                     encoded += 6;
 464                 }
 465             }
 466             break;
 467         case IMGTYPE_YUV211:
 468             for (row = height - 1; row >= 0; row--) {
 469                 pixel_ptr = row * c->pic.linesize[0];
 470                 for (col = 0; col < width/2; col++) {
 471                     outptr[pixel_ptr++] = get_b(encoded[0], encoded[2]);
 472                     outptr[pixel_ptr++] = get_g(encoded[0], encoded[2], encoded[3]);
 473                     outptr[pixel_ptr++] = get_r(encoded[0], encoded[3]);
 474                     outptr[pixel_ptr++] = get_b(encoded[1], encoded[2]);
 475                     outptr[pixel_ptr++] = get_g(encoded[1], encoded[2], encoded[3]);
 476                     outptr[pixel_ptr++] = get_r(encoded[1], encoded[3]);
 477                     encoded += 4;
 478                 }
 479             }
 480             break;
 481         case IMGTYPE_YUV420:
 482             for (row = height / 2 - 1; row >= 0; row--) {
 483                 pixel_ptr = 2 * row * c->pic.linesize[0];
 484                 for (col = 0; col < width/2; col++) {
 485                     outptr[pixel_ptr] = get_b(encoded[0], encoded[4]);
 486                     outptr[pixel_ptr+1] = get_g(encoded[0], encoded[4], encoded[5]);
 487                     outptr[pixel_ptr+2] = get_r(encoded[0], encoded[5]);
 488                     outptr[pixel_ptr+3] = get_b(encoded[1], encoded[4]);
 489                     outptr[pixel_ptr+4] = get_g(encoded[1], encoded[4], encoded[5]);
 490                     outptr[pixel_ptr+5] = get_r(encoded[1], encoded[5]);
 491                     outptr[pixel_ptr-c->pic.linesize[0]] = get_b(encoded[2], encoded[4]);
 492                     outptr[pixel_ptr-c->pic.linesize[0]+1] = get_g(encoded[2], encoded[4], encoded[5]);
 493                     outptr[pixel_ptr-c->pic.linesize[0]+2] = get_r(encoded[2], encoded[5]);
 494                     outptr[pixel_ptr-c->pic.linesize[0]+3] = get_b(encoded[3], encoded[4]);
 495                     outptr[pixel_ptr-c->pic.linesize[0]+4] = get_g(encoded[3], encoded[4], encoded[5]);
 496                     outptr[pixel_ptr-c->pic.linesize[0]+5] = get_r(encoded[3], encoded[5]);
 497                     pixel_ptr += 6;
 498                     encoded += 6;
 499                 }
 500             }
 501             break;
 502         default:
 503             av_log(avctx, AV_LOG_ERROR, "BUG! Unknown imagetype in image decoder.\n");
 504             return -1;
 505     }
 506
 507     *data_size = sizeof(AVFrame);
 508     *(AVFrame*)data = c->pic;
 509
 510     /* always report that the buffer was completely consumed */
 511     return buf_size;
 512 }
 513
 514 /*
 515  *
 516  * Init lcl decoder
 517  *
 518  */
 519 static int decode_init(AVCodecContext *avctx)
 520 {
 521     LclDecContext * const c = avctx->priv_data;
 522     unsigned int basesize = avctx->width * avctx->height;
 523     unsigned int max_basesize = ((avctx->width + 3) & ~3) * ((avctx->height + 3) & ~3);
 524     unsigned int max_decomp_size;
 525     int zret; // Zlib return code
 526
 527     c->avctx = avctx;
 528
 529     c->pic.data[0] = NULL;
 530
 531 #ifdef CONFIG_ZLIB
 532     // Needed if zlib unused or init aborted before inflateInit
 533     memset(&(c->zstream), 0, sizeof(z_stream));
 534 #endif
 535
 536     if (avctx->extradata_size < 8) {
 537         av_log(avctx, AV_LOG_ERROR, "Extradata size too small.\n");
 538         return 1;
 539     }
 540
 541     if (avcodec_check_dimensions(avctx, avctx->width, avctx->height) < 0) {
 542         return 1;
 543     }
 544
 545     /* Check codec type */
 546     if (((avctx->codec_id == CODEC_ID_MSZH)  && (*((char *)avctx->extradata + 7) != CODEC_MSZH)) ||
 547         ((avctx->codec_id == CODEC_ID_ZLIB)  && (*((char *)avctx->extradata + 7) != CODEC_ZLIB))) {
 548         av_log(avctx, AV_LOG_ERROR, "Codec id and codec type mismatch. This should not happen.\n");
 549     }
 550
 551     /* Detect image type */
 552     switch (c->imgtype = *((char *)avctx->extradata + 4)) {
 553         case IMGTYPE_YUV111:
 554             c->decomp_size = basesize * 3;
 555             max_decomp_size = max_basesize * 3;
 556             av_log(avctx, AV_LOG_INFO, "Image type is YUV 1:1:1.\n");
 557             break;
 558         case IMGTYPE_YUV422:
 559             c->decomp_size = basesize * 2;
 560             max_decomp_size = max_basesize * 2;
 561             av_log(avctx, AV_LOG_INFO, "Image type is YUV 4:2:2.\n");
 562             break;
 563         case IMGTYPE_RGB24:
 564             c->decomp_size = basesize * 3;
 565             max_decomp_size = max_basesize * 3;
 566             av_log(avctx, AV_LOG_INFO, "Image type is RGB 24.\n");
 567             break;
 568         case IMGTYPE_YUV411:
 569             c->decomp_size = basesize / 2 * 3;
 570             max_decomp_size = max_basesize / 2 * 3;
 571             av_log(avctx, AV_LOG_INFO, "Image type is YUV 4:1:1.\n");
 572             break;
 573         case IMGTYPE_YUV211:
 574             c->decomp_size = basesize * 2;
 575             max_decomp_size = max_basesize * 2;
 576             av_log(avctx, AV_LOG_INFO, "Image type is YUV 2:1:1.\n");
 577             break;
 578         case IMGTYPE_YUV420:
 579             c->decomp_size = basesize / 2 * 3;
 580             max_decomp_size = max_basesize / 2 * 3;
 581             av_log(avctx, AV_LOG_INFO, "Image type is YUV 4:2:0.\n");
 582             break;
 583         default:
 584             av_log(avctx, AV_LOG_ERROR, "Unsupported image format %d.\n", c->imgtype);
 585             return 1;
 586     }
 587
 588     /* Detect compression method */
 589     c->compression = *((char *)avctx->extradata + 5);
 590     switch (avctx->codec_id) {
 591         case CODEC_ID_MSZH:
 592             switch (c->compression) {
 593                 case COMP_MSZH:
 594                     av_log(avctx, AV_LOG_INFO, "Compression enabled.\n");
 595                     break;
 596                 case COMP_MSZH_NOCOMP:
 597                     c->decomp_size = 0;
 598                     av_log(avctx, AV_LOG_INFO, "No compression.\n");
 599                     break;
 600                 default:
 601                     av_log(avctx, AV_LOG_ERROR, "Unsupported compression format for MSZH (%d).\n", c->compression);
 602                     return 1;
 603             }
 604             break;
 605         case CODEC_ID_ZLIB:
 606 #ifdef CONFIG_ZLIB
 607             switch (c->compression) {
 608                 case COMP_ZLIB_HISPEED:
 609                     av_log(avctx, AV_LOG_INFO, "High speed compression.\n");
 610                     break;
 611                 case COMP_ZLIB_HICOMP:
 612                     av_log(avctx, AV_LOG_INFO, "High compression.\n");
 613                     break;
 614                 case COMP_ZLIB_NORMAL:
 615                     av_log(avctx, AV_LOG_INFO, "Normal compression.\n");
 616                     break;
 617                 default:
 618                     if ((c->compression < Z_NO_COMPRESSION) || (c->compression > Z_BEST_COMPRESSION)) {
 619                             av_log(avctx, AV_LOG_ERROR, "Unsupported compression level for ZLIB: (%d).\n", c->compression);
 620                         return 1;
 621                     }
 622                     av_log(avctx, AV_LOG_INFO, "Compression level for ZLIB: (%d).\n", c->compression);
 623             }
 624 #else
 625             av_log(avctx, AV_LOG_ERROR, "Zlib support not compiled.\n");
 626             return 1;
 627 #endif
 628             break;
 629         default:
 630             av_log(avctx, AV_LOG_ERROR, "BUG! Unknown codec in compression switch.\n");
 631             return 1;
 632     }
 633
 634     /* Allocate decompression buffer */
 635     if (c->decomp_size) {
 636         if ((c->decomp_buf = av_malloc(max_decomp_size)) == NULL) {
 637             av_log(avctx, AV_LOG_ERROR, "Can't allocate decompression buffer.\n");
 638             return 1;
 639         }
 640     }
 641
 642     /* Detect flags */
 643     c->flags = *((char *)avctx->extradata + 6);
 644     if (c->flags & FLAG_MULTITHREAD)
 645         av_log(avctx, AV_LOG_INFO, "Multithread encoder flag set.\n");
 646     if (c->flags & FLAG_NULLFRAME)
 647         av_log(avctx, AV_LOG_INFO, "Nullframe insertion flag set.\n");
 648     if ((avctx->codec_id == CODEC_ID_ZLIB) && (c->flags & FLAG_PNGFILTER))
 649         av_log(avctx, AV_LOG_INFO, "PNG filter flag set.\n");
 650     if (c->flags & FLAGMASK_UNUSED)
 651         av_log(avctx, AV_LOG_ERROR, "Unknown flag set (%d).\n", c->flags);
 652
 653     /* If needed init zlib */
 654     if (avctx->codec_id == CODEC_ID_ZLIB) {
 655 #ifdef CONFIG_ZLIB
 656         c->zstream.zalloc = Z_NULL;
 657         c->zstream.zfree = Z_NULL;
 658         c->zstream.opaque = Z_NULL;
 659         zret = inflateInit(&(c->zstream));
 660         if (zret != Z_OK) {
 661             av_log(avctx, AV_LOG_ERROR, "Inflate init error: %d\n", zret);
 662             return 1;
 663         }
 664 #else
 665     av_log(avctx, AV_LOG_ERROR, "Zlib support not compiled.\n");
 666     return 1;
 667 #endif
 668     }
 669
 670     avctx->pix_fmt = PIX_FMT_BGR24;
 671
 672     return 0;
 673 }
 674
 675 /*
 676  *
 677  * Uninit lcl decoder
 678  *
 679  */
 680 static int decode_end(AVCodecContext *avctx)
 681 {
 682         LclDecContext * const c = avctx->priv_data;
 683
 684         if (c->pic.data[0])
 685                 avctx->release_buffer(avctx, &c->pic);
 686 #ifdef CONFIG_ZLIB
 687     inflateEnd(&(c->zstream));
 688 #endif
 689
 690         return 0;
 691 }
 692
 693 #ifdef CONFIG_MSZH_DECODER
 694 AVCodec mszh_decoder = {
 695         "mszh",
 696         CODEC_TYPE_VIDEO,
 697         CODEC_ID_MSZH,
 698         sizeof(LclDecContext),
 699         decode_init,
 700         NULL,
 701         decode_end,
 702         decode_frame,
 703         CODEC_CAP_DR1,
 704 };
 705 #endif
 706
 707 #ifdef CONFIG_ZLIB_DECODER
 708 AVCodec zlib_decoder = {
 709         "zlib",
 710         CODEC_TYPE_VIDEO,
 711         CODEC_ID_ZLIB,
 712         sizeof(LclDecContext),
 713         decode_init,
 714         NULL,
 715         decode_end,
 716         decode_frame,
 717         CODEC_CAP_DR1,
 718 };
 719 #endif