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 libavcodec/lcldec.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 #if 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 #if 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, const 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 #if 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 #if 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 av_cold 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 #if 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 #if 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 #if 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 av_cold 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 #if CONFIG_ZLIB
 683     inflateEnd(&(c->zstream));
 684 #endif
 685
 686     return 0;
 687 }
 688
 689 #if 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     .long_name = NULL_IF_CONFIG_SMALL("LCL (LossLess Codec Library) MSZH"),
 701 };
 702 #endif
 703
 704 #if CONFIG_ZLIB_DECODER
 705 AVCodec zlib_decoder = {
 706     "zlib",
 707     CODEC_TYPE_VIDEO,
 708     CODEC_ID_ZLIB,
 709     sizeof(LclDecContext),
 710     decode_init,
 711     NULL,
 712     decode_end,
 713     decode_frame,
 714     CODEC_CAP_DR1,
 715     .long_name = NULL_IF_CONFIG_SMALL("LCL (LossLess Codec Library) ZLIB"),
 716 };
 717 #endif