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 "bytestream.h"
  46 #include "lcl.h"
  47 #include "libavutil/lzo.h"
  48
  49 #if CONFIG_ZLIB_DECODER
  50 #include <zlib.h>
  51 #endif
  52
  53 /*
  54  * Decoder context
  55  */
  56 typedef struct LclDecContext {
  57     AVFrame pic;
  58
  59     // Image type
  60     int imgtype;
  61     // Compression type
  62     int compression;
  63     // Flags
  64     int flags;
  65     // Decompressed data size
  66     unsigned int decomp_size;
  67     // Decompression buffer
  68     unsigned char* decomp_buf;
  69 #if CONFIG_ZLIB_DECODER
  70     z_stream zstream;
  71 #endif
  72 } LclDecContext;
  73
  74
  75 /**
  76  * \param srcptr compressed source buffer, must be padded with at least 5 extra bytes
  77  * \param destptr must be padded sufficiently for av_memcpy_backptr
  78  */
  79 static unsigned int mszh_decomp(const unsigned char * srcptr, int srclen, unsigned char * destptr, unsigned int destsize)
  80 {
  81     unsigned char *destptr_bak = destptr;
  82     unsigned char *destptr_end = destptr + destsize;
  83     const unsigned char *srcptr_end = srcptr + srclen;
  84     unsigned mask = *srcptr++;
  85     unsigned maskbit = 0x80;
  86
  87     while (srcptr < srcptr_end && destptr < destptr_end) {
  88         if (!(mask & maskbit)) {
  89             memcpy(destptr, srcptr, 4);
  90             destptr += 4;
  91             srcptr += 4;
  92         } else {
  93             unsigned ofs = bytestream_get_le16(&srcptr);
  94             unsigned cnt = (ofs >> 11) + 1;
  95             ofs &= 0x7ff;
  96             ofs = FFMIN(ofs, destptr - destptr_bak);
  97             cnt *= 4;
  98             cnt = FFMIN(cnt, destptr_end - destptr);
  99             av_memcpy_backptr(destptr, ofs, cnt);
 100             destptr += cnt;
 101         }
 102         maskbit >>= 1;
 103         if (!maskbit) {
 104             mask = *srcptr++;
 105             while (!mask) {
 106                 if (destptr_end - destptr < 32 || srcptr_end - srcptr < 32) break;
 107                 memcpy(destptr, srcptr, 32);
 108                 destptr += 32;
 109                 srcptr += 32;
 110                 mask = *srcptr++;
 111             }
 112             maskbit = 0x80;
 113         }
 114     }
 115
 116     return destptr - destptr_bak;
 117 }
 118
 119
 120 /**
 121  * \brief decompress a zlib-compressed data block into decomp_buf
 122  * \param src compressed input buffer
 123  * \param src_len data length in input buffer
 124  * \param offset offset in decomp_buf
 125  * \param expected expected decompressed length
 126  */
 127 #if CONFIG_ZLIB_DECODER
 128 static int zlib_decomp(AVCodecContext *avctx, const uint8_t *src, int src_len, int offset, int expected)
 129 {
 130     LclDecContext *c = avctx->priv_data;
 131     int zret = inflateReset(&c->zstream);
 132     if (zret != Z_OK) {
 133         av_log(avctx, AV_LOG_ERROR, "Inflate reset error: %d\n", zret);
 134         return -1;
 135     }
 136     c->zstream.next_in = src;
 137     c->zstream.avail_in = src_len;
 138     c->zstream.next_out = c->decomp_buf + offset;
 139     c->zstream.avail_out = c->decomp_size - offset;
 140     zret = inflate(&c->zstream, Z_FINISH);
 141     if (zret != Z_OK && zret != Z_STREAM_END) {
 142         av_log(avctx, AV_LOG_ERROR, "Inflate error: %d\n", zret);
 143         return -1;
 144     }
 145     if (expected != (unsigned int)c->zstream.total_out) {
 146         av_log(avctx, AV_LOG_ERROR, "Decoded size differs (%d != %lu)\n",
 147                expected, c->zstream.total_out);
 148         return -1;
 149     }
 150     return c->zstream.total_out;
 151 }
 152 #endif
 153
 154
 155 /*
 156  *
 157  * Decode a frame
 158  *
 159  */
 160 static int decode_frame(AVCodecContext *avctx, void *data, int *data_size, AVPacket *avpkt)
 161 {
 162     const uint8_t *buf = avpkt->data;
 163     int buf_size = avpkt->size;
 164     LclDecContext * const c = avctx->priv_data;
 165     unsigned char *encoded = (unsigned char *)buf;
 166     unsigned int pixel_ptr;
 167     int row, col;
 168     unsigned char *outptr;
 169     uint8_t *y_out, *u_out, *v_out;
 170     unsigned int width = avctx->width; // Real image width
 171     unsigned int height = avctx->height; // Real image height
 172     unsigned int mszh_dlen;
 173     unsigned char yq, y1q, uq, vq;
 174     int uqvq;
 175     unsigned int mthread_inlen, mthread_outlen;
 176     unsigned int len = buf_size;
 177
 178     if(c->pic.data[0])
 179         avctx->release_buffer(avctx, &c->pic);
 180
 181     c->pic.reference = 0;
 182     c->pic.buffer_hints = FF_BUFFER_HINTS_VALID;
 183     if(avctx->get_buffer(avctx, &c->pic) < 0){
 184         av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
 185         return -1;
 186     }
 187
 188     outptr = c->pic.data[0]; // Output image pointer
 189
 190     /* Decompress frame */
 191     switch (avctx->codec_id) {
 192     case CODEC_ID_MSZH:
 193         switch (c->compression) {
 194         case COMP_MSZH:
 195             if (c->flags & FLAG_MULTITHREAD) {
 196                 mthread_inlen = AV_RL32(encoded);
 197                 mthread_inlen = FFMIN(mthread_inlen, len - 8);
 198                 mthread_outlen = AV_RL32(encoded+4);
 199                 mthread_outlen = FFMIN(mthread_outlen, c->decomp_size);
 200                 mszh_dlen = mszh_decomp(encoded + 8, mthread_inlen, c->decomp_buf, c->decomp_size);
 201                 if (mthread_outlen != mszh_dlen) {
 202                     av_log(avctx, AV_LOG_ERROR, "Mthread1 decoded size differs (%d != %d)\n",
 203                            mthread_outlen, mszh_dlen);
 204                     return -1;
 205                 }
 206                 mszh_dlen = mszh_decomp(encoded + 8 + mthread_inlen, len - 8 - mthread_inlen,
 207                                         c->decomp_buf + mthread_outlen, c->decomp_size - mthread_outlen);
 208                 if (mthread_outlen != mszh_dlen) {
 209                     av_log(avctx, AV_LOG_ERROR, "Mthread2 decoded size differs (%d != %d)\n",
 210                            mthread_outlen, mszh_dlen);
 211                     return -1;
 212                 }
 213                 encoded = c->decomp_buf;
 214                 len = c->decomp_size;
 215             } else {
 216                 mszh_dlen = mszh_decomp(encoded, len, c->decomp_buf, c->decomp_size);
 217                 if (c->decomp_size != mszh_dlen) {
 218                     av_log(avctx, AV_LOG_ERROR, "Decoded size differs (%d != %d)\n",
 219                            c->decomp_size, mszh_dlen);
 220                     return -1;
 221                 }
 222                 encoded = c->decomp_buf;
 223                 len = mszh_dlen;
 224             }
 225             break;
 226         case COMP_MSZH_NOCOMP:
 227             break;
 228         default:
 229             av_log(avctx, AV_LOG_ERROR, "BUG! Unknown MSZH compression in frame decoder.\n");
 230             return -1;
 231         }
 232         break;
 233 #if CONFIG_ZLIB_DECODER
 234     case CODEC_ID_ZLIB:
 235         /* Using the original dll with normal compression (-1) and RGB format
 236          * gives a file with ZLIB fourcc, but frame is really uncompressed.
 237          * To be sure that's true check also frame size */
 238         if (c->compression == COMP_ZLIB_NORMAL && c->imgtype == IMGTYPE_RGB24 &&
 239             len == width * height * 3)
 240             break;
 241         if (c->flags & FLAG_MULTITHREAD) {
 242             int ret;
 243             mthread_inlen = AV_RL32(encoded);
 244             mthread_inlen = FFMIN(mthread_inlen, len - 8);
 245             mthread_outlen = AV_RL32(encoded+4);
 246             mthread_outlen = FFMIN(mthread_outlen, c->decomp_size);
 247             ret = zlib_decomp(avctx, encoded + 8, mthread_inlen, 0, mthread_outlen);
 248             if (ret < 0) return ret;
 249             ret = zlib_decomp(avctx, encoded + 8 + mthread_inlen, len - 8 - mthread_inlen,
 250                               mthread_outlen, mthread_outlen);
 251             if (ret < 0) return ret;
 252         } else {
 253             int ret = zlib_decomp(avctx, encoded, len, 0, c->decomp_size);
 254             if (ret < 0) return ret;
 255         }
 256         encoded = c->decomp_buf;
 257         len = c->decomp_size;
 258         break;
 259 #endif
 260     default:
 261         av_log(avctx, AV_LOG_ERROR, "BUG! Unknown codec in frame decoder compression switch.\n");
 262         return -1;
 263     }
 264
 265
 266     /* Apply PNG filter */
 267     if (avctx->codec_id == CODEC_ID_ZLIB && (c->flags & FLAG_PNGFILTER)) {
 268         switch (c->imgtype) {
 269         case IMGTYPE_YUV111:
 270         case IMGTYPE_RGB24:
 271             for (row = 0; row < height; row++) {
 272                 pixel_ptr = row * width * 3;
 273                 yq = encoded[pixel_ptr++];
 274                 uqvq = AV_RL16(encoded+pixel_ptr);
 275                 pixel_ptr += 2;
 276                 for (col = 1; col < width; col++) {
 277                     encoded[pixel_ptr] = yq -= encoded[pixel_ptr];
 278                     uqvq -= AV_RL16(encoded+pixel_ptr+1);
 279                     AV_WL16(encoded+pixel_ptr+1, uqvq);
 280                     pixel_ptr += 3;
 281                 }
 282             }
 283             break;
 284         case IMGTYPE_YUV422:
 285             for (row = 0; row < height; row++) {
 286                 pixel_ptr = row * width * 2;
 287                 yq = uq = vq =0;
 288                 for (col = 0; col < width/4; col++) {
 289                     encoded[pixel_ptr] = yq -= encoded[pixel_ptr];
 290                     encoded[pixel_ptr+1] = yq -= encoded[pixel_ptr+1];
 291                     encoded[pixel_ptr+2] = yq -= encoded[pixel_ptr+2];
 292                     encoded[pixel_ptr+3] = yq -= encoded[pixel_ptr+3];
 293                     encoded[pixel_ptr+4] = uq -= encoded[pixel_ptr+4];
 294                     encoded[pixel_ptr+5] = uq -= encoded[pixel_ptr+5];
 295                     encoded[pixel_ptr+6] = vq -= encoded[pixel_ptr+6];
 296                     encoded[pixel_ptr+7] = vq -= encoded[pixel_ptr+7];
 297                     pixel_ptr += 8;
 298                 }
 299             }
 300             break;
 301         case IMGTYPE_YUV411:
 302             for (row = 0; row < height; row++) {
 303                 pixel_ptr = row * width / 2 * 3;
 304                 yq = uq = vq =0;
 305                 for (col = 0; col < width/4; col++) {
 306                     encoded[pixel_ptr] = yq -= encoded[pixel_ptr];
 307                     encoded[pixel_ptr+1] = yq -= encoded[pixel_ptr+1];
 308                     encoded[pixel_ptr+2] = yq -= encoded[pixel_ptr+2];
 309                     encoded[pixel_ptr+3] = yq -= encoded[pixel_ptr+3];
 310                     encoded[pixel_ptr+4] = uq -= encoded[pixel_ptr+4];
 311                     encoded[pixel_ptr+5] = vq -= encoded[pixel_ptr+5];
 312                     pixel_ptr += 6;
 313                 }
 314             }
 315             break;
 316         case IMGTYPE_YUV211:
 317             for (row = 0; row < height; row++) {
 318                 pixel_ptr = row * width * 2;
 319                 yq = uq = vq =0;
 320                 for (col = 0; col < width/2; col++) {
 321                     encoded[pixel_ptr] = yq -= encoded[pixel_ptr];
 322                     encoded[pixel_ptr+1] = yq -= encoded[pixel_ptr+1];
 323                     encoded[pixel_ptr+2] = uq -= encoded[pixel_ptr+2];
 324                     encoded[pixel_ptr+3] = vq -= encoded[pixel_ptr+3];
 325                     pixel_ptr += 4;
 326                 }
 327             }
 328             break;
 329         case IMGTYPE_YUV420:
 330             for (row = 0; row < height/2; row++) {
 331                 pixel_ptr = row * width * 3;
 332                 yq = y1q = uq = vq =0;
 333                 for (col = 0; col < width/2; col++) {
 334                     encoded[pixel_ptr] = yq -= encoded[pixel_ptr];
 335                     encoded[pixel_ptr+1] = yq -= encoded[pixel_ptr+1];
 336                     encoded[pixel_ptr+2] = y1q -= encoded[pixel_ptr+2];
 337                     encoded[pixel_ptr+3] = y1q -= encoded[pixel_ptr+3];
 338                     encoded[pixel_ptr+4] = uq -= encoded[pixel_ptr+4];
 339                     encoded[pixel_ptr+5] = vq -= encoded[pixel_ptr+5];
 340                     pixel_ptr += 6;
 341                 }
 342             }
 343             break;
 344         default:
 345             av_log(avctx, AV_LOG_ERROR, "BUG! Unknown imagetype in pngfilter switch.\n");
 346             return -1;
 347         }
 348     }
 349
 350     /* Convert colorspace */
 351     y_out = c->pic.data[0] + (height - 1) * c->pic.linesize[0];
 352     u_out = c->pic.data[1] + (height - 1) * c->pic.linesize[1];
 353     v_out = c->pic.data[2] + (height - 1) * c->pic.linesize[2];
 354     switch (c->imgtype) {
 355     case IMGTYPE_YUV111:
 356         for (row = 0; row < height; row++) {
 357             for (col = 0; col < width; col++) {
 358                 y_out[col] = *encoded++;
 359                 u_out[col] = *encoded++ + 128;
 360                 v_out[col] = *encoded++ + 128;
 361             }
 362             y_out -= c->pic.linesize[0];
 363             u_out -= c->pic.linesize[1];
 364             v_out -= c->pic.linesize[2];
 365         }
 366         break;
 367     case IMGTYPE_YUV422:
 368         for (row = 0; row < height; row++) {
 369             for (col = 0; col < width - 3; col += 4) {
 370                 memcpy(y_out + col, encoded, 4);
 371                 encoded += 4;
 372                 u_out[ col >> 1     ] = *encoded++ + 128;
 373                 u_out[(col >> 1) + 1] = *encoded++ + 128;
 374                 v_out[ col >> 1     ] = *encoded++ + 128;
 375                 v_out[(col >> 1) + 1] = *encoded++ + 128;
 376             }
 377             y_out -= c->pic.linesize[0];
 378             u_out -= c->pic.linesize[1];
 379             v_out -= c->pic.linesize[2];
 380         }
 381         break;
 382     case IMGTYPE_RGB24:
 383         for (row = height - 1; row >= 0; row--) {
 384             pixel_ptr = row * c->pic.linesize[0];
 385             memcpy(outptr + pixel_ptr, encoded, 3 * width);
 386             encoded += 3 * width;
 387         }
 388         break;
 389     case IMGTYPE_YUV411:
 390         for (row = 0; row < height; row++) {
 391             for (col = 0; col < width - 3; col += 4) {
 392                 memcpy(y_out + col, encoded, 4);
 393                 encoded += 4;
 394                 u_out[col >> 2] = *encoded++ + 128;
 395                 v_out[col >> 2] = *encoded++ + 128;
 396             }
 397             y_out -= c->pic.linesize[0];
 398             u_out -= c->pic.linesize[1];
 399             v_out -= c->pic.linesize[2];
 400         }
 401         break;
 402     case IMGTYPE_YUV211:
 403         for (row = 0; row < height; row++) {
 404             for (col = 0; col < width - 1; col += 2) {
 405                 memcpy(y_out + col, encoded, 2);
 406                 encoded += 2;
 407                 u_out[col >> 1] = *encoded++ + 128;
 408                 v_out[col >> 1] = *encoded++ + 128;
 409             }
 410             y_out -= c->pic.linesize[0];
 411             u_out -= c->pic.linesize[1];
 412             v_out -= c->pic.linesize[2];
 413         }
 414         break;
 415     case IMGTYPE_YUV420:
 416         u_out = c->pic.data[1] + ((height >> 1) - 1) * c->pic.linesize[1];
 417         v_out = c->pic.data[2] + ((height >> 1) - 1) * c->pic.linesize[2];
 418         for (row = 0; row < height - 1; row += 2) {
 419             for (col = 0; col < width - 1; col += 2) {
 420                 memcpy(y_out + col, encoded, 2);
 421                 encoded += 2;
 422                 memcpy(y_out + col - c->pic.linesize[0], encoded, 2);
 423                 encoded += 2;
 424                 u_out[col >> 1] = *encoded++ + 128;
 425                 v_out[col >> 1] = *encoded++ + 128;
 426             }
 427             y_out -= c->pic.linesize[0] << 1;
 428             u_out -= c->pic.linesize[1];
 429             v_out -= c->pic.linesize[2];
 430         }
 431         break;
 432     default:
 433         av_log(avctx, AV_LOG_ERROR, "BUG! Unknown imagetype in image decoder.\n");
 434         return -1;
 435     }
 436
 437     *data_size = sizeof(AVFrame);
 438     *(AVFrame*)data = c->pic;
 439
 440     /* always report that the buffer was completely consumed */
 441     return buf_size;
 442 }
 443
 444 /*
 445  *
 446  * Init lcl decoder
 447  *
 448  */
 449 static av_cold int decode_init(AVCodecContext *avctx)
 450 {
 451     LclDecContext * const c = avctx->priv_data;
 452     unsigned int basesize = avctx->width * avctx->height;
 453     unsigned int max_basesize = FFALIGN(avctx->width, 4) * FFALIGN(avctx->height, 4) + AV_LZO_OUTPUT_PADDING;
 454     unsigned int max_decomp_size;
 455
 456     if (avctx->extradata_size < 8) {
 457         av_log(avctx, AV_LOG_ERROR, "Extradata size too small.\n");
 458         return 1;
 459     }
 460
 461     if (avcodec_check_dimensions(avctx, avctx->width, avctx->height) < 0) {
 462         return 1;
 463     }
 464
 465     /* Check codec type */
 466     if ((avctx->codec_id == CODEC_ID_MSZH  && avctx->extradata[7] != CODEC_MSZH) ||
 467         (avctx->codec_id == CODEC_ID_ZLIB  && avctx->extradata[7] != CODEC_ZLIB)) {
 468         av_log(avctx, AV_LOG_ERROR, "Codec id and codec type mismatch. This should not happen.\n");
 469     }
 470
 471     /* Detect image type */
 472     switch (c->imgtype = avctx->extradata[4]) {
 473     case IMGTYPE_YUV111:
 474         c->decomp_size = basesize * 3;
 475         max_decomp_size = max_basesize * 3;
 476         avctx->pix_fmt = PIX_FMT_YUV444P;
 477         av_log(avctx, AV_LOG_DEBUG, "Image type is YUV 1:1:1.\n");
 478         break;
 479     case IMGTYPE_YUV422:
 480         c->decomp_size = basesize * 2;
 481         max_decomp_size = max_basesize * 2;
 482         avctx->pix_fmt = PIX_FMT_YUV422P;
 483         av_log(avctx, AV_LOG_DEBUG, "Image type is YUV 4:2:2.\n");
 484         break;
 485     case IMGTYPE_RGB24:
 486         c->decomp_size = basesize * 3;
 487         max_decomp_size = max_basesize * 3;
 488         avctx->pix_fmt = PIX_FMT_BGR24;
 489         av_log(avctx, AV_LOG_DEBUG, "Image type is RGB 24.\n");
 490         break;
 491     case IMGTYPE_YUV411:
 492         c->decomp_size = basesize / 2 * 3;
 493         max_decomp_size = max_basesize / 2 * 3;
 494         avctx->pix_fmt = PIX_FMT_YUV411P;
 495         av_log(avctx, AV_LOG_DEBUG, "Image type is YUV 4:1:1.\n");
 496         break;
 497     case IMGTYPE_YUV211:
 498         c->decomp_size = basesize * 2;
 499         max_decomp_size = max_basesize * 2;
 500         avctx->pix_fmt = PIX_FMT_YUV422P;
 501         av_log(avctx, AV_LOG_DEBUG, "Image type is YUV 2:1:1.\n");
 502         break;
 503     case IMGTYPE_YUV420:
 504         c->decomp_size = basesize / 2 * 3;
 505         max_decomp_size = max_basesize / 2 * 3;
 506         avctx->pix_fmt = PIX_FMT_YUV420P;
 507         av_log(avctx, AV_LOG_DEBUG, "Image type is YUV 4:2:0.\n");
 508         break;
 509     default:
 510         av_log(avctx, AV_LOG_ERROR, "Unsupported image format %d.\n", c->imgtype);
 511         return 1;
 512     }
 513
 514     /* Detect compression method */
 515     c->compression = (int8_t)avctx->extradata[5];
 516     switch (avctx->codec_id) {
 517     case CODEC_ID_MSZH:
 518         switch (c->compression) {
 519         case COMP_MSZH:
 520             av_log(avctx, AV_LOG_DEBUG, "Compression enabled.\n");
 521             break;
 522         case COMP_MSZH_NOCOMP:
 523             c->decomp_size = 0;
 524             av_log(avctx, AV_LOG_DEBUG, "No compression.\n");
 525             break;
 526         default:
 527             av_log(avctx, AV_LOG_ERROR, "Unsupported compression format for MSZH (%d).\n", c->compression);
 528             return 1;
 529         }
 530         break;
 531 #if CONFIG_ZLIB_DECODER
 532     case CODEC_ID_ZLIB:
 533         switch (c->compression) {
 534         case COMP_ZLIB_HISPEED:
 535             av_log(avctx, AV_LOG_DEBUG, "High speed compression.\n");
 536             break;
 537         case COMP_ZLIB_HICOMP:
 538             av_log(avctx, AV_LOG_DEBUG, "High compression.\n");
 539             break;
 540         case COMP_ZLIB_NORMAL:
 541             av_log(avctx, AV_LOG_DEBUG, "Normal compression.\n");
 542             break;
 543         default:
 544             if (c->compression < Z_NO_COMPRESSION || c->compression > Z_BEST_COMPRESSION) {
 545                 av_log(avctx, AV_LOG_ERROR, "Unsupported compression level for ZLIB: (%d).\n", c->compression);
 546                 return 1;
 547             }
 548             av_log(avctx, AV_LOG_DEBUG, "Compression level for ZLIB: (%d).\n", c->compression);
 549         }
 550         break;
 551 #endif
 552     default:
 553         av_log(avctx, AV_LOG_ERROR, "BUG! Unknown codec in compression switch.\n");
 554         return 1;
 555     }
 556
 557     /* Allocate decompression buffer */
 558     if (c->decomp_size) {
 559         if ((c->decomp_buf = av_malloc(max_decomp_size)) == NULL) {
 560             av_log(avctx, AV_LOG_ERROR, "Can't allocate decompression buffer.\n");
 561             return 1;
 562         }
 563     }
 564
 565     /* Detect flags */
 566     c->flags = avctx->extradata[6];
 567     if (c->flags & FLAG_MULTITHREAD)
 568         av_log(avctx, AV_LOG_DEBUG, "Multithread encoder flag set.\n");
 569     if (c->flags & FLAG_NULLFRAME)
 570         av_log(avctx, AV_LOG_DEBUG, "Nullframe insertion flag set.\n");
 571     if (avctx->codec_id == CODEC_ID_ZLIB && (c->flags & FLAG_PNGFILTER))
 572         av_log(avctx, AV_LOG_DEBUG, "PNG filter flag set.\n");
 573     if (c->flags & FLAGMASK_UNUSED)
 574         av_log(avctx, AV_LOG_ERROR, "Unknown flag set (%d).\n", c->flags);
 575
 576     /* If needed init zlib */
 577 #if CONFIG_ZLIB_DECODER
 578     if (avctx->codec_id == CODEC_ID_ZLIB) {
 579         int zret;
 580         c->zstream.zalloc = Z_NULL;
 581         c->zstream.zfree = Z_NULL;
 582         c->zstream.opaque = Z_NULL;
 583         zret = inflateInit(&c->zstream);
 584         if (zret != Z_OK) {
 585             av_log(avctx, AV_LOG_ERROR, "Inflate init error: %d\n", zret);
 586             av_freep(&c->decomp_buf);
 587             return 1;
 588         }
 589     }
 590 #endif
 591
 592     return 0;
 593 }
 594
 595 /*
 596  *
 597  * Uninit lcl decoder
 598  *
 599  */
 600 static av_cold int decode_end(AVCodecContext *avctx)
 601 {
 602     LclDecContext * const c = avctx->priv_data;
 603
 604     av_freep(&c->decomp_buf);
 605     if (c->pic.data[0])
 606         avctx->release_buffer(avctx, &c->pic);
 607 #if CONFIG_ZLIB_DECODER
 608     if (avctx->codec_id == CODEC_ID_ZLIB)
 609         inflateEnd(&c->zstream);
 610 #endif
 611
 612     return 0;
 613 }
 614
 615 #if CONFIG_MSZH_DECODER
 616 AVCodec mszh_decoder = {
 617     "mszh",
 618     CODEC_TYPE_VIDEO,
 619     CODEC_ID_MSZH,
 620     sizeof(LclDecContext),
 621     decode_init,
 622     NULL,
 623     decode_end,
 624     decode_frame,
 625     CODEC_CAP_DR1,
 626     .long_name = NULL_IF_CONFIG_SMALL("LCL (LossLess Codec Library) MSZH"),
 627 };
 628 #endif
 629
 630 #if CONFIG_ZLIB_DECODER
 631 AVCodec zlib_decoder = {
 632     "zlib",
 633     CODEC_TYPE_VIDEO,
 634     CODEC_ID_ZLIB,
 635     sizeof(LclDecContext),
 636     decode_init,
 637     NULL,
 638     decode_end,
 639     decode_frame,
 640     CODEC_CAP_DR1,
 641     .long_name = NULL_IF_CONFIG_SMALL("LCL (LossLess Codec Library) ZLIB"),
 642 };
 643 #endif