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