libavcodec/lcldec.c

   1 /*
   2  * LCL (LossLess Codec Library) Codec
   3  * Copyright (c) 2002-2004 Roberto Togni
   4  *
   5  * This file is part of Libav.
   6  *
   7  * Libav 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  * Libav 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 Libav; 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
  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 "libavutil/mem.h"
  45 #include "avcodec.h"
  46 #include "bytestream.h"
  47 #include "internal.h"
  48 #include "lcl.h"
  49
  50 #if CONFIG_ZLIB_DECODER
  51 #include <zlib.h>
  52 #endif
  53
  54 /*
  55  * Decoder context
  56  */
  57 typedef struct LclDecContext {
  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_DECODER
  69     z_stream zstream;
  70 #endif
  71 } LclDecContext;
  72
  73
  74 /**
  75  * @param srcptr compressed source buffer, must be padded with at least 5 extra bytes
  76  * @param destptr must be padded sufficiently for av_memcpy_backptr
  77  */
  78 static unsigned int mszh_decomp(const unsigned char * srcptr, int srclen, unsigned char * destptr, unsigned int destsize)
  79 {
  80     unsigned char *destptr_bak = destptr;
  81     unsigned char *destptr_end = destptr + destsize;
  82     const unsigned char *srcptr_end = srcptr + srclen;
  83     unsigned mask = *srcptr++;
  84     unsigned maskbit = 0x80;
  85
  86     while (srcptr < srcptr_end && destptr < destptr_end) {
  87         if (!(mask & maskbit)) {
  88             memcpy(destptr, srcptr, 4);
  89             destptr += 4;
  90             srcptr += 4;
  91         } else {
  92             unsigned ofs = bytestream_get_le16(&srcptr);
  93             unsigned cnt = (ofs >> 11) + 1;
  94             ofs &= 0x7ff;
  95             ofs = FFMIN(ofs, destptr - destptr_bak);
  96             cnt *= 4;
  97             cnt = FFMIN(cnt, destptr_end - destptr);
  98             av_memcpy_backptr(destptr, ofs, cnt);
  99             destptr += cnt;
 100         }
 101         maskbit >>= 1;
 102         if (!maskbit) {
 103             mask = *srcptr++;
 104             while (!mask) {
 105                 if (destptr_end - destptr < 32 || srcptr_end - srcptr < 32) break;
 106                 memcpy(destptr, srcptr, 32);
 107                 destptr += 32;
 108                 srcptr += 32;
 109                 mask = *srcptr++;
 110             }
 111             maskbit = 0x80;
 112         }
 113     }
 114
 115     return destptr - destptr_bak;
 116 }
 117
 118
 119 #if CONFIG_ZLIB_DECODER
 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 static int zlib_decomp(AVCodecContext *avctx, const uint8_t *src, int src_len, int offset, int expected)
 128 {
 129     LclDecContext *c = avctx->priv_data;
 130     int zret = inflateReset(&c->zstream);
 131     if (zret != Z_OK) {
 132         av_log(avctx, AV_LOG_ERROR, "Inflate reset error: %d\n", zret);
 133         return AVERROR_UNKNOWN;
 134     }
 135     c->zstream.next_in = src;
 136     c->zstream.avail_in = src_len;
 137     c->zstream.next_out = c->decomp_buf + offset;
 138     c->zstream.avail_out = c->decomp_size - offset;
 139     zret = inflate(&c->zstream, Z_FINISH);
 140     if (zret != Z_OK && zret != Z_STREAM_END) {
 141         av_log(avctx, AV_LOG_ERROR, "Inflate error: %d\n", zret);
 142         return AVERROR_UNKNOWN;
 143     }
 144     if (expected != (unsigned int)c->zstream.total_out) {
 145         av_log(avctx, AV_LOG_ERROR, "Decoded size differs (%d != %lu)\n",
 146                expected, c->zstream.total_out);
 147         return AVERROR_UNKNOWN;
 148     }
 149     return c->zstream.total_out;
 150 }
 151 #endif
 152
 153
 154 /*
 155  *
 156  * Decode a frame
 157  *
 158  */
 159 static int decode_frame(AVCodecContext *avctx, void *data, int *got_frame, AVPacket *avpkt)
 160 {
 161     AVFrame *frame = data;
 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, ret;
 175     unsigned int mthread_inlen, mthread_outlen;
 176     unsigned int len = buf_size;
 177
 178     if ((ret = ff_get_buffer(avctx, frame, 0)) < 0) {
 179         av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
 180         return ret;
 181     }
 182
 183     outptr = frame->data[0]; // Output image pointer
 184
 185     /* Decompress frame */
 186     switch (avctx->codec_id) {
 187     case AV_CODEC_ID_MSZH:
 188         switch (c->compression) {
 189         case COMP_MSZH:
 190             if (c->flags & FLAG_MULTITHREAD) {
 191                 mthread_inlen = AV_RL32(encoded);
 192                 mthread_inlen = FFMIN(mthread_inlen, len - 8);
 193                 mthread_outlen = AV_RL32(encoded+4);
 194                 mthread_outlen = FFMIN(mthread_outlen, c->decomp_size);
 195                 mszh_dlen = mszh_decomp(encoded + 8, mthread_inlen, c->decomp_buf, c->decomp_size);
 196                 if (mthread_outlen != mszh_dlen) {
 197                     av_log(avctx, AV_LOG_ERROR, "Mthread1 decoded size differs (%d != %d)\n",
 198                            mthread_outlen, mszh_dlen);
 199                     return AVERROR_INVALIDDATA;
 200                 }
 201                 mszh_dlen = mszh_decomp(encoded + 8 + mthread_inlen, len - 8 - mthread_inlen,
 202                                         c->decomp_buf + mthread_outlen, c->decomp_size - mthread_outlen);
 203                 if (mthread_outlen != mszh_dlen) {
 204                     av_log(avctx, AV_LOG_ERROR, "Mthread2 decoded size differs (%d != %d)\n",
 205                            mthread_outlen, mszh_dlen);
 206                     return AVERROR_INVALIDDATA;
 207                 }
 208                 encoded = c->decomp_buf;
 209                 len = c->decomp_size;
 210             } else {
 211                 mszh_dlen = mszh_decomp(encoded, len, c->decomp_buf, c->decomp_size);
 212                 if (c->decomp_size != mszh_dlen) {
 213                     av_log(avctx, AV_LOG_ERROR, "Decoded size differs (%d != %d)\n",
 214                            c->decomp_size, mszh_dlen);
 215                     return AVERROR_INVALIDDATA;
 216                 }
 217                 encoded = c->decomp_buf;
 218                 len = mszh_dlen;
 219             }
 220             break;
 221         case COMP_MSZH_NOCOMP: {
 222             int bppx2;
 223             switch (c->imgtype) {
 224             case IMGTYPE_YUV111:
 225             case IMGTYPE_RGB24:
 226                 bppx2 = 6;
 227                 break;
 228             case IMGTYPE_YUV422:
 229             case IMGTYPE_YUV211:
 230                 bppx2 = 4;
 231                 break;
 232             case IMGTYPE_YUV411:
 233             case IMGTYPE_YUV420:
 234                 bppx2 = 3;
 235                 break;
 236             default:
 237                 bppx2 = 0; // will error out below
 238                 break;
 239             }
 240             if (len < ((width * height * bppx2) >> 1))
 241                 return AVERROR_INVALIDDATA;
 242             break;
 243         }
 244         default:
 245             av_log(avctx, AV_LOG_ERROR, "BUG! Unknown MSZH compression in frame decoder.\n");
 246             return AVERROR_INVALIDDATA;
 247         }
 248         break;
 249 #if CONFIG_ZLIB_DECODER
 250     case AV_CODEC_ID_ZLIB:
 251         /* Using the original dll with normal compression (-1) and RGB format
 252          * gives a file with ZLIB fourcc, but frame is really uncompressed.
 253          * To be sure that's true check also frame size */
 254         if (c->compression == COMP_ZLIB_NORMAL && c->imgtype == IMGTYPE_RGB24 &&
 255             len == width * height * 3) {
 256             if (c->flags & FLAG_PNGFILTER) {
 257                 memcpy(c->decomp_buf, encoded, len);
 258                 encoded = c->decomp_buf;
 259             } else {
 260                 break;
 261             }
 262         } else if (c->flags & FLAG_MULTITHREAD) {
 263             mthread_inlen = AV_RL32(encoded);
 264             mthread_inlen = FFMIN(mthread_inlen, len - 8);
 265             mthread_outlen = AV_RL32(encoded+4);
 266             mthread_outlen = FFMIN(mthread_outlen, c->decomp_size);
 267             ret = zlib_decomp(avctx, encoded + 8, mthread_inlen, 0, mthread_outlen);
 268             if (ret < 0) return ret;
 269             ret = zlib_decomp(avctx, encoded + 8 + mthread_inlen, len - 8 - mthread_inlen,
 270                               mthread_outlen, mthread_outlen);
 271             if (ret < 0) return ret;
 272         } else {
 273             int ret = zlib_decomp(avctx, encoded, len, 0, c->decomp_size);
 274             if (ret < 0) return ret;
 275         }
 276         encoded = c->decomp_buf;
 277         len = c->decomp_size;
 278         break;
 279 #endif
 280     default:
 281         av_log(avctx, AV_LOG_ERROR, "BUG! Unknown codec in frame decoder compression switch.\n");
 282         return AVERROR_INVALIDDATA;
 283     }
 284
 285
 286     /* Apply PNG filter */
 287     if (avctx->codec_id == AV_CODEC_ID_ZLIB && (c->flags & FLAG_PNGFILTER)) {
 288         switch (c->imgtype) {
 289         case IMGTYPE_YUV111:
 290         case IMGTYPE_RGB24:
 291             for (row = 0; row < height; row++) {
 292                 pixel_ptr = row * width * 3;
 293                 yq = encoded[pixel_ptr++];
 294                 uqvq = AV_RL16(encoded+pixel_ptr);
 295                 pixel_ptr += 2;
 296                 for (col = 1; col < width; col++) {
 297                     encoded[pixel_ptr] = yq -= encoded[pixel_ptr];
 298                     uqvq -= AV_RL16(encoded+pixel_ptr+1);
 299                     AV_WL16(encoded+pixel_ptr+1, uqvq);
 300                     pixel_ptr += 3;
 301                 }
 302             }
 303             break;
 304         case IMGTYPE_YUV422:
 305             for (row = 0; row < height; row++) {
 306                 pixel_ptr = row * width * 2;
 307                 yq = uq = vq =0;
 308                 for (col = 0; col < width/4; col++) {
 309                     encoded[pixel_ptr] = yq -= encoded[pixel_ptr];
 310                     encoded[pixel_ptr+1] = yq -= encoded[pixel_ptr+1];
 311                     encoded[pixel_ptr+2] = yq -= encoded[pixel_ptr+2];
 312                     encoded[pixel_ptr+3] = yq -= encoded[pixel_ptr+3];
 313                     encoded[pixel_ptr+4] = uq -= encoded[pixel_ptr+4];
 314                     encoded[pixel_ptr+5] = uq -= encoded[pixel_ptr+5];
 315                     encoded[pixel_ptr+6] = vq -= encoded[pixel_ptr+6];
 316                     encoded[pixel_ptr+7] = vq -= encoded[pixel_ptr+7];
 317                     pixel_ptr += 8;
 318                 }
 319             }
 320             break;
 321         case IMGTYPE_YUV411:
 322             for (row = 0; row < height; row++) {
 323                 pixel_ptr = row * width / 2 * 3;
 324                 yq = uq = vq =0;
 325                 for (col = 0; col < width/4; col++) {
 326                     encoded[pixel_ptr] = yq -= encoded[pixel_ptr];
 327                     encoded[pixel_ptr+1] = yq -= encoded[pixel_ptr+1];
 328                     encoded[pixel_ptr+2] = yq -= encoded[pixel_ptr+2];
 329                     encoded[pixel_ptr+3] = yq -= encoded[pixel_ptr+3];
 330                     encoded[pixel_ptr+4] = uq -= encoded[pixel_ptr+4];
 331                     encoded[pixel_ptr+5] = vq -= encoded[pixel_ptr+5];
 332                     pixel_ptr += 6;
 333                 }
 334             }
 335             break;
 336         case IMGTYPE_YUV211:
 337             for (row = 0; row < height; row++) {
 338                 pixel_ptr = row * width * 2;
 339                 yq = uq = vq =0;
 340                 for (col = 0; col < width/2; col++) {
 341                     encoded[pixel_ptr] = yq -= encoded[pixel_ptr];
 342                     encoded[pixel_ptr+1] = yq -= encoded[pixel_ptr+1];
 343                     encoded[pixel_ptr+2] = uq -= encoded[pixel_ptr+2];
 344                     encoded[pixel_ptr+3] = vq -= encoded[pixel_ptr+3];
 345                     pixel_ptr += 4;
 346                 }
 347             }
 348             break;
 349         case IMGTYPE_YUV420:
 350             for (row = 0; row < height/2; row++) {
 351                 pixel_ptr = row * width * 3;
 352                 yq = y1q = uq = vq =0;
 353                 for (col = 0; col < width/2; col++) {
 354                     encoded[pixel_ptr] = yq -= encoded[pixel_ptr];
 355                     encoded[pixel_ptr+1] = yq -= encoded[pixel_ptr+1];
 356                     encoded[pixel_ptr+2] = y1q -= encoded[pixel_ptr+2];
 357                     encoded[pixel_ptr+3] = y1q -= encoded[pixel_ptr+3];
 358                     encoded[pixel_ptr+4] = uq -= encoded[pixel_ptr+4];
 359                     encoded[pixel_ptr+5] = vq -= encoded[pixel_ptr+5];
 360                     pixel_ptr += 6;
 361                 }
 362             }
 363             break;
 364         default:
 365             av_log(avctx, AV_LOG_ERROR, "BUG! Unknown imagetype in pngfilter switch.\n");
 366             return AVERROR_INVALIDDATA;
 367         }
 368     }
 369
 370     /* Convert colorspace */
 371     y_out = frame->data[0] + (height - 1) * frame->linesize[0];
 372     u_out = frame->data[1] + (height - 1) * frame->linesize[1];
 373     v_out = frame->data[2] + (height - 1) * frame->linesize[2];
 374     switch (c->imgtype) {
 375     case IMGTYPE_YUV111:
 376         for (row = 0; row < height; row++) {
 377             for (col = 0; col < width; col++) {
 378                 y_out[col] = *encoded++;
 379                 u_out[col] = *encoded++ + 128;
 380                 v_out[col] = *encoded++ + 128;
 381             }
 382             y_out -= frame->linesize[0];
 383             u_out -= frame->linesize[1];
 384             v_out -= frame->linesize[2];
 385         }
 386         break;
 387     case IMGTYPE_YUV422:
 388         for (row = 0; row < height; row++) {
 389             for (col = 0; col < width - 3; col += 4) {
 390                 memcpy(y_out + col, encoded, 4);
 391                 encoded += 4;
 392                 u_out[ col >> 1     ] = *encoded++ + 128;
 393                 u_out[(col >> 1) + 1] = *encoded++ + 128;
 394                 v_out[ col >> 1     ] = *encoded++ + 128;
 395                 v_out[(col >> 1) + 1] = *encoded++ + 128;
 396             }
 397             y_out -= frame->linesize[0];
 398             u_out -= frame->linesize[1];
 399             v_out -= frame->linesize[2];
 400         }
 401         break;
 402     case IMGTYPE_RGB24:
 403         for (row = height - 1; row >= 0; row--) {
 404             pixel_ptr = row * frame->linesize[0];
 405             memcpy(outptr + pixel_ptr, encoded, 3 * width);
 406             encoded += 3 * width;
 407         }
 408         break;
 409     case IMGTYPE_YUV411:
 410         for (row = 0; row < height; row++) {
 411             for (col = 0; col < width - 3; col += 4) {
 412                 memcpy(y_out + col, encoded, 4);
 413                 encoded += 4;
 414                 u_out[col >> 2] = *encoded++ + 128;
 415                 v_out[col >> 2] = *encoded++ + 128;
 416             }
 417             y_out -= frame->linesize[0];
 418             u_out -= frame->linesize[1];
 419             v_out -= frame->linesize[2];
 420         }
 421         break;
 422     case IMGTYPE_YUV211:
 423         for (row = 0; row < height; row++) {
 424             for (col = 0; col < width - 1; col += 2) {
 425                 memcpy(y_out + col, encoded, 2);
 426                 encoded += 2;
 427                 u_out[col >> 1] = *encoded++ + 128;
 428                 v_out[col >> 1] = *encoded++ + 128;
 429             }
 430             y_out -= frame->linesize[0];
 431             u_out -= frame->linesize[1];
 432             v_out -= frame->linesize[2];
 433         }
 434         break;
 435     case IMGTYPE_YUV420:
 436         u_out = frame->data[1] + ((height >> 1) - 1) * frame->linesize[1];
 437         v_out = frame->data[2] + ((height >> 1) - 1) * frame->linesize[2];
 438         for (row = 0; row < height - 1; row += 2) {
 439             for (col = 0; col < width - 1; col += 2) {
 440                 memcpy(y_out + col, encoded, 2);
 441                 encoded += 2;
 442                 memcpy(y_out + col - frame->linesize[0], encoded, 2);
 443                 encoded += 2;
 444                 u_out[col >> 1] = *encoded++ + 128;
 445                 v_out[col >> 1] = *encoded++ + 128;
 446             }
 447             y_out -= frame->linesize[0] << 1;
 448             u_out -= frame->linesize[1];
 449             v_out -= frame->linesize[2];
 450         }
 451         break;
 452     default:
 453         av_log(avctx, AV_LOG_ERROR, "BUG! Unknown imagetype in image decoder.\n");
 454         return AVERROR_INVALIDDATA;
 455     }
 456
 457     *got_frame = 1;
 458
 459     /* always report that the buffer was completely consumed */
 460     return buf_size;
 461 }
 462
 463 /*
 464  *
 465  * Init lcl decoder
 466  *
 467  */
 468 static av_cold int decode_init(AVCodecContext *avctx)
 469 {
 470     LclDecContext * const c = avctx->priv_data;
 471     unsigned int basesize = avctx->width * avctx->height;
 472     unsigned int max_basesize = FFALIGN(avctx->width,  4) *
 473                                 FFALIGN(avctx->height, 4);
 474     unsigned int max_decomp_size;
 475
 476     if (avctx->extradata_size < 8) {
 477         av_log(avctx, AV_LOG_ERROR, "Extradata size too small.\n");
 478         return AVERROR_INVALIDDATA;
 479     }
 480
 481     /* Check codec type */
 482     if ((avctx->codec_id == AV_CODEC_ID_MSZH  && avctx->extradata[7] != CODEC_MSZH) ||
 483         (avctx->codec_id == AV_CODEC_ID_ZLIB  && avctx->extradata[7] != CODEC_ZLIB)) {
 484         av_log(avctx, AV_LOG_ERROR, "Codec id and codec type mismatch. This should not happen.\n");
 485     }
 486
 487     /* Detect image type */
 488     switch (c->imgtype = avctx->extradata[4]) {
 489     case IMGTYPE_YUV111:
 490         c->decomp_size = basesize * 3;
 491         max_decomp_size = max_basesize * 3;
 492         avctx->pix_fmt = AV_PIX_FMT_YUV444P;
 493         av_log(avctx, AV_LOG_DEBUG, "Image type is YUV 1:1:1.\n");
 494         break;
 495     case IMGTYPE_YUV422:
 496         c->decomp_size = basesize * 2;
 497         max_decomp_size = max_basesize * 2;
 498         avctx->pix_fmt = AV_PIX_FMT_YUV422P;
 499         av_log(avctx, AV_LOG_DEBUG, "Image type is YUV 4:2:2.\n");
 500         break;
 501     case IMGTYPE_RGB24:
 502         c->decomp_size = basesize * 3;
 503         max_decomp_size = max_basesize * 3;
 504         avctx->pix_fmt = AV_PIX_FMT_BGR24;
 505         av_log(avctx, AV_LOG_DEBUG, "Image type is RGB 24.\n");
 506         break;
 507     case IMGTYPE_YUV411:
 508         c->decomp_size = basesize / 2 * 3;
 509         max_decomp_size = max_basesize / 2 * 3;
 510         avctx->pix_fmt = AV_PIX_FMT_YUV411P;
 511         av_log(avctx, AV_LOG_DEBUG, "Image type is YUV 4:1:1.\n");
 512         break;
 513     case IMGTYPE_YUV211:
 514         c->decomp_size = basesize * 2;
 515         max_decomp_size = max_basesize * 2;
 516         avctx->pix_fmt = AV_PIX_FMT_YUV422P;
 517         av_log(avctx, AV_LOG_DEBUG, "Image type is YUV 2:1:1.\n");
 518         break;
 519     case IMGTYPE_YUV420:
 520         c->decomp_size = basesize / 2 * 3;
 521         max_decomp_size = max_basesize / 2 * 3;
 522         avctx->pix_fmt = AV_PIX_FMT_YUV420P;
 523         av_log(avctx, AV_LOG_DEBUG, "Image type is YUV 4:2:0.\n");
 524         break;
 525     default:
 526         av_log(avctx, AV_LOG_ERROR, "Unsupported image format %d.\n", c->imgtype);
 527         return AVERROR_INVALIDDATA;
 528     }
 529
 530     /* Detect compression method */
 531     c->compression = (int8_t)avctx->extradata[5];
 532     switch (avctx->codec_id) {
 533     case AV_CODEC_ID_MSZH:
 534         switch (c->compression) {
 535         case COMP_MSZH:
 536             av_log(avctx, AV_LOG_DEBUG, "Compression enabled.\n");
 537             break;
 538         case COMP_MSZH_NOCOMP:
 539             c->decomp_size = 0;
 540             av_log(avctx, AV_LOG_DEBUG, "No compression.\n");
 541             break;
 542         default:
 543             av_log(avctx, AV_LOG_ERROR, "Unsupported compression format for MSZH (%d).\n", c->compression);
 544             return AVERROR_INVALIDDATA;
 545         }
 546         break;
 547 #if CONFIG_ZLIB_DECODER
 548     case AV_CODEC_ID_ZLIB:
 549         switch (c->compression) {
 550         case COMP_ZLIB_HISPEED:
 551             av_log(avctx, AV_LOG_DEBUG, "High speed compression.\n");
 552             break;
 553         case COMP_ZLIB_HICOMP:
 554             av_log(avctx, AV_LOG_DEBUG, "High compression.\n");
 555             break;
 556         case COMP_ZLIB_NORMAL:
 557             av_log(avctx, AV_LOG_DEBUG, "Normal compression.\n");
 558             break;
 559         default:
 560             if (c->compression < Z_NO_COMPRESSION || c->compression > Z_BEST_COMPRESSION) {
 561                 av_log(avctx, AV_LOG_ERROR, "Unsupported compression level for ZLIB: (%d).\n", c->compression);
 562                 return AVERROR_INVALIDDATA;
 563             }
 564             av_log(avctx, AV_LOG_DEBUG, "Compression level for ZLIB: (%d).\n", c->compression);
 565         }
 566         break;
 567 #endif
 568     default:
 569         av_log(avctx, AV_LOG_ERROR, "BUG! Unknown codec in compression switch.\n");
 570         return AVERROR_INVALIDDATA;
 571     }
 572
 573     /* Allocate decompression buffer */
 574     if (c->decomp_size) {
 575         if ((c->decomp_buf = av_malloc(max_decomp_size)) == NULL) {
 576             av_log(avctx, AV_LOG_ERROR, "Can't allocate decompression buffer.\n");
 577             return AVERROR(ENOMEM);
 578         }
 579     }
 580
 581     /* Detect flags */
 582     c->flags = avctx->extradata[6];
 583     if (c->flags & FLAG_MULTITHREAD)
 584         av_log(avctx, AV_LOG_DEBUG, "Multithread encoder flag set.\n");
 585     if (c->flags & FLAG_NULLFRAME)
 586         av_log(avctx, AV_LOG_DEBUG, "Nullframe insertion flag set.\n");
 587     if (avctx->codec_id == AV_CODEC_ID_ZLIB && (c->flags & FLAG_PNGFILTER))
 588         av_log(avctx, AV_LOG_DEBUG, "PNG filter flag set.\n");
 589     if (c->flags & FLAGMASK_UNUSED)
 590         av_log(avctx, AV_LOG_ERROR, "Unknown flag set (%d).\n", c->flags);
 591
 592     /* If needed init zlib */
 593 #if CONFIG_ZLIB_DECODER
 594     if (avctx->codec_id == AV_CODEC_ID_ZLIB) {
 595         int zret;
 596         c->zstream.zalloc = Z_NULL;
 597         c->zstream.zfree = Z_NULL;
 598         c->zstream.opaque = Z_NULL;
 599         zret = inflateInit(&c->zstream);
 600         if (zret != Z_OK) {
 601             av_log(avctx, AV_LOG_ERROR, "Inflate init error: %d\n", zret);
 602             av_freep(&c->decomp_buf);
 603             return AVERROR_UNKNOWN;
 604         }
 605     }
 606 #endif
 607
 608     return 0;
 609 }
 610
 611 /*
 612  *
 613  * Uninit lcl decoder
 614  *
 615  */
 616 static av_cold int decode_end(AVCodecContext *avctx)
 617 {
 618     LclDecContext * const c = avctx->priv_data;
 619
 620     av_freep(&c->decomp_buf);
 621 #if CONFIG_ZLIB_DECODER
 622     if (avctx->codec_id == AV_CODEC_ID_ZLIB)
 623         inflateEnd(&c->zstream);
 624 #endif
 625
 626     return 0;
 627 }
 628
 629 #if CONFIG_MSZH_DECODER
 630 AVCodec ff_mszh_decoder = {
 631     .name           = "mszh",
 632     .type           = AVMEDIA_TYPE_VIDEO,
 633     .id             = AV_CODEC_ID_MSZH,
 634     .priv_data_size = sizeof(LclDecContext),
 635     .init           = decode_init,
 636     .close          = decode_end,
 637     .decode         = decode_frame,
 638     .capabilities   = CODEC_CAP_DR1,
 639     .long_name      = NULL_IF_CONFIG_SMALL("LCL (LossLess Codec Library) MSZH"),
 640 };
 641 #endif
 642
 643 #if CONFIG_ZLIB_DECODER
 644 AVCodec ff_zlib_decoder = {
 645     .name           = "zlib",
 646     .type           = AVMEDIA_TYPE_VIDEO,
 647     .id             = AV_CODEC_ID_ZLIB,
 648     .priv_data_size = sizeof(LclDecContext),
 649     .init           = decode_init,
 650     .close          = decode_end,
 651     .decode         = decode_frame,
 652     .capabilities   = CODEC_CAP_DR1,
 653     .long_name      = NULL_IF_CONFIG_SMALL("LCL (LossLess Codec Library) ZLIB"),
 654 };
 655 #endif