/*
  * LCL (LossLess Codec Library) Codec
  * Copyright (c) 2002-2004 Roberto Togni
  *
  * This file is part of FFmpeg.
  *
  * FFmpeg is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Lesser General Public
  * License as published by the Free Software Foundation; either
  * version 2.1 of the License, or (at your option) any later version.
  *
  * FFmpeg is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  * Lesser General Public License for more details.
  *
  * You should have received a copy of the GNU Lesser General Public
  * License along with FFmpeg; if not, write to the Free Software
  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 /**

  * @file

  * LCL (LossLess Codec Library) Video Codec
  * Decoder for MSZH and ZLIB codecs
  * Experimental encoder for ZLIB RGB24
  *
  * Fourcc: MSZH, ZLIB
  *
  * Original Win32 dll:
  * Ver2.23 By Kenji Oshima 2000.09.20
  * avimszh.dll, avizlib.dll
  *
  * A description of the decoding algorithm can be found here:
  *   http://www.pcisys.net/~melanson/codecs
  *
  * Supports: BGR24 (RGB 24bpp)
  *
  */
 
 #include <stdio.h>
 #include <stdlib.h>
 
 #include "avcodec.h"

 #include "bytestream.h"

 #include "lcl.h"

 #include "libavutil/lzo.h"

 #if CONFIG_ZLIB_DECODER

 #include <zlib.h>
 #endif
 
 /*
  * Decoder context
  */
 typedef struct LclDecContext {

     AVFrame pic;

 
     // Image type
     int imgtype;
     // Compression type
     int compression;
     // Flags
     int flags;
     // Decompressed data size
     unsigned int decomp_size;
     // Decompression buffer
     unsigned char* decomp_buf;

 #if CONFIG_ZLIB_DECODER

     z_stream zstream;
 #endif
 } LclDecContext;
 
 

 /**

  * @param srcptr compressed source buffer, must be padded with at least 5 extra bytes
  * @param destptr must be padded sufficiently for av_memcpy_backptr

  */

 static unsigned int mszh_decomp(const unsigned char * srcptr, int srclen, unsigned char * destptr, unsigned int destsize)

 {
     unsigned char *destptr_bak = destptr;
     unsigned char *destptr_end = destptr + destsize;

     const unsigned char *srcptr_end = srcptr + srclen;

     unsigned mask = *srcptr++;
     unsigned maskbit = 0x80;

     while (srcptr < srcptr_end && destptr < destptr_end) {

         if (!(mask & maskbit)) {

             memcpy(destptr, srcptr, 4);

             destptr += 4;
             srcptr += 4;
         } else {

             unsigned ofs = bytestream_get_le16(&srcptr);
             unsigned cnt = (ofs >> 11) + 1;

             ofs &= 0x7ff;

             ofs = FFMIN(ofs, destptr - destptr_bak);

             cnt *= 4;

             cnt = FFMIN(cnt, destptr_end - destptr);

             if (ofs) {
                 av_memcpy_backptr(destptr, ofs, cnt);
             } else {
                 // Not known what the correct behaviour is, but
                 // this at least avoids uninitialized data.
                 memset(destptr, 0, cnt);
             }

             destptr += cnt;

         }

         maskbit >>= 1;

         if (!maskbit) {
             mask = *srcptr++;

             while (!mask) {
                 if (destptr_end - destptr < 32 || srcptr_end - srcptr < 32) break;
                 memcpy(destptr, srcptr, 32);
                 destptr += 32;
                 srcptr += 32;
                 mask = *srcptr++;
             }

             maskbit = 0x80;
         }

     }
 

     return destptr - destptr_bak;

 }
 
 

 #if CONFIG_ZLIB_DECODER

 /**

  * @brief decompress a zlib-compressed data block into decomp_buf
  * @param src compressed input buffer
  * @param src_len data length in input buffer
  * @param offset offset in decomp_buf
  * @param expected expected decompressed length

  */
 static int zlib_decomp(AVCodecContext *avctx, const uint8_t *src, int src_len, int offset, int expected)
 {
     LclDecContext *c = avctx->priv_data;
     int zret = inflateReset(&c->zstream);
     if (zret != Z_OK) {
         av_log(avctx, AV_LOG_ERROR, "Inflate reset error: %d\n", zret);
         return -1;
     }
     c->zstream.next_in = src;
     c->zstream.avail_in = src_len;
     c->zstream.next_out = c->decomp_buf + offset;
     c->zstream.avail_out = c->decomp_size - offset;
     zret = inflate(&c->zstream, Z_FINISH);
     if (zret != Z_OK && zret != Z_STREAM_END) {
         av_log(avctx, AV_LOG_ERROR, "Inflate error: %d\n", zret);
         return -1;
     }
     if (expected != (unsigned int)c->zstream.total_out) {
         av_log(avctx, AV_LOG_ERROR, "Decoded size differs (%d != %lu)\n",
                expected, c->zstream.total_out);
         return -1;
     }
     return c->zstream.total_out;
 }

 #endif

 
 /*
  *
  * Decode a frame
  *
  */

 static int decode_frame(AVCodecContext *avctx, void *data, int *data_size, AVPacket *avpkt)

 {

     const uint8_t *buf = avpkt->data;
     int buf_size = avpkt->size;

     LclDecContext * const c = avctx->priv_data;
     unsigned char *encoded = (unsigned char *)buf;

     unsigned int pixel_ptr;
     int row, col;
     unsigned char *outptr;

     uint8_t *y_out, *u_out, *v_out;

     unsigned int width = avctx->width; // Real image width
     unsigned int height = avctx->height; // Real image height
     unsigned int mszh_dlen;
     unsigned char yq, y1q, uq, vq;
     int uqvq;
     unsigned int mthread_inlen, mthread_outlen;
     unsigned int len = buf_size;
 

     if(c->pic.data[0])
         avctx->release_buffer(avctx, &c->pic);

     c->pic.reference = 0;
     c->pic.buffer_hints = FF_BUFFER_HINTS_VALID;
     if(avctx->get_buffer(avctx, &c->pic) < 0){
         av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
         return -1;
     }

 
     outptr = c->pic.data[0]; // Output image pointer
 
     /* Decompress frame */
     switch (avctx->codec_id) {

     case CODEC_ID_MSZH:
         switch (c->compression) {
         case COMP_MSZH:

             if (c->flags & FLAG_MULTITHREAD) {

                 mthread_inlen = AV_RL32(encoded);

                 mthread_inlen = FFMIN(mthread_inlen, len - 8);

                 mthread_outlen = AV_RL32(encoded+4);

                 mthread_outlen = FFMIN(mthread_outlen, c->decomp_size);

                 mszh_dlen = mszh_decomp(encoded + 8, mthread_inlen, c->decomp_buf, c->decomp_size);
                 if (mthread_outlen != mszh_dlen) {
                     av_log(avctx, AV_LOG_ERROR, "Mthread1 decoded size differs (%d != %d)\n",
                            mthread_outlen, mszh_dlen);

                     return -1;
                 }

                 mszh_dlen = mszh_decomp(encoded + 8 + mthread_inlen, len - 8 - mthread_inlen,

                                         c->decomp_buf + mthread_outlen, c->decomp_size - mthread_outlen);
                 if (mthread_outlen != mszh_dlen) {
                     av_log(avctx, AV_LOG_ERROR, "Mthread2 decoded size differs (%d != %d)\n",
                            mthread_outlen, mszh_dlen);

                     return -1;
                 }

                 encoded = c->decomp_buf;
                 len = c->decomp_size;

             } else {

                 mszh_dlen = mszh_decomp(encoded, len, c->decomp_buf, c->decomp_size);
                 if (c->decomp_size != mszh_dlen) {
                     av_log(avctx, AV_LOG_ERROR, "Decoded size differs (%d != %d)\n",
                            c->decomp_size, mszh_dlen);

                     return -1;
                 }

                 encoded = c->decomp_buf;
                 len = mszh_dlen;

             }

             break;

         case COMP_MSZH_NOCOMP: {
             int bppx2;
             switch (c->imgtype) {
             case IMGTYPE_YUV111:
             case IMGTYPE_RGB24:
                 bppx2 = 6;
                 break;
             case IMGTYPE_YUV422:
             case IMGTYPE_YUV211:
                 bppx2 = 4;
                 break;
             case IMGTYPE_YUV411:
             case IMGTYPE_YUV420:
                 bppx2 = 3;
                 break;
             default:
                 bppx2 = 0; // will error out below
                 break;
             }
             if (len < ((width * height * bppx2) >> 1))
                 return AVERROR_INVALIDDATA;

             break;

         }

         default:

             av_log(avctx, AV_LOG_ERROR, "BUG! Unknown MSZH compression in frame decoder.\n");
             return -1;
         }
         break;

 #if CONFIG_ZLIB_DECODER

     case CODEC_ID_ZLIB:

         /* Using the original dll with normal compression (-1) and RGB format
          * gives a file with ZLIB fourcc, but frame is really uncompressed.
          * To be sure that's true check also frame size */

         if (c->compression == COMP_ZLIB_NORMAL && c->imgtype == IMGTYPE_RGB24 &&

             len == width * height * 3) {
             if (c->flags & FLAG_PNGFILTER) {
                 memcpy(c->decomp_buf, encoded, len);
                 encoded = c->decomp_buf;
             } else {
                 break;
             }
         } else if (c->flags & FLAG_MULTITHREAD) {

             int ret;

             mthread_inlen = AV_RL32(encoded);

             mthread_inlen = FFMIN(mthread_inlen, len - 8);

             mthread_outlen = AV_RL32(encoded+4);

             mthread_outlen = FFMIN(mthread_outlen, c->decomp_size);

             ret = zlib_decomp(avctx, encoded + 8, mthread_inlen, 0, mthread_outlen);
             if (ret < 0) return ret;

             ret = zlib_decomp(avctx, encoded + 8 + mthread_inlen, len - 8 - mthread_inlen,

                               mthread_outlen, mthread_outlen);
             if (ret < 0) return ret;

         } else {

             int ret = zlib_decomp(avctx, encoded, len, 0, c->decomp_size);
             if (ret < 0) return ret;

         }
         encoded = c->decomp_buf;

         len = c->decomp_size;

         break;

 #endif

     default:
         av_log(avctx, AV_LOG_ERROR, "BUG! Unknown codec in frame decoder compression switch.\n");
         return -1;

     }
 
 
     /* Apply PNG filter */

     if (avctx->codec_id == CODEC_ID_ZLIB && (c->flags & FLAG_PNGFILTER)) {

         switch (c->imgtype) {
         case IMGTYPE_YUV111:

         case IMGTYPE_RGB24:
             for (row = 0; row < height; row++) {
                 pixel_ptr = row * width * 3;
                 yq = encoded[pixel_ptr++];
                 uqvq = AV_RL16(encoded+pixel_ptr);
                 pixel_ptr += 2;
                 for (col = 1; col < width; col++) {
                     encoded[pixel_ptr] = yq -= encoded[pixel_ptr];
                     uqvq -= AV_RL16(encoded+pixel_ptr+1);
                     AV_WL16(encoded+pixel_ptr+1, uqvq);
                     pixel_ptr += 3;

                 }
             }
             break;
         case IMGTYPE_YUV422:

             for (row = 0; row < height; row++) {
                 pixel_ptr = row * width * 2;
                 yq = uq = vq =0;

                 for (col = 0; col < width/4; col++) {

                     encoded[pixel_ptr] = yq -= encoded[pixel_ptr];
                     encoded[pixel_ptr+1] = yq -= encoded[pixel_ptr+1];
                     encoded[pixel_ptr+2] = yq -= encoded[pixel_ptr+2];
                     encoded[pixel_ptr+3] = yq -= encoded[pixel_ptr+3];
                     encoded[pixel_ptr+4] = uq -= encoded[pixel_ptr+4];
                     encoded[pixel_ptr+5] = uq -= encoded[pixel_ptr+5];
                     encoded[pixel_ptr+6] = vq -= encoded[pixel_ptr+6];
                     encoded[pixel_ptr+7] = vq -= encoded[pixel_ptr+7];
                     pixel_ptr += 8;

                 }
             }
             break;
         case IMGTYPE_YUV411:

             for (row = 0; row < height; row++) {
                 pixel_ptr = row * width / 2 * 3;
                 yq = uq = vq =0;

                 for (col = 0; col < width/4; col++) {

                     encoded[pixel_ptr] = yq -= encoded[pixel_ptr];
                     encoded[pixel_ptr+1] = yq -= encoded[pixel_ptr+1];
                     encoded[pixel_ptr+2] = yq -= encoded[pixel_ptr+2];
                     encoded[pixel_ptr+3] = yq -= encoded[pixel_ptr+3];
                     encoded[pixel_ptr+4] = uq -= encoded[pixel_ptr+4];
                     encoded[pixel_ptr+5] = vq -= encoded[pixel_ptr+5];
                     pixel_ptr += 6;

                 }
             }
             break;
         case IMGTYPE_YUV211:

             for (row = 0; row < height; row++) {
                 pixel_ptr = row * width * 2;
                 yq = uq = vq =0;

                 for (col = 0; col < width/2; col++) {

                     encoded[pixel_ptr] = yq -= encoded[pixel_ptr];
                     encoded[pixel_ptr+1] = yq -= encoded[pixel_ptr+1];
                     encoded[pixel_ptr+2] = uq -= encoded[pixel_ptr+2];
                     encoded[pixel_ptr+3] = vq -= encoded[pixel_ptr+3];
                     pixel_ptr += 4;

                 }
             }
             break;
         case IMGTYPE_YUV420:

             for (row = 0; row < height/2; row++) {
                 pixel_ptr = row * width * 3;
                 yq = y1q = uq = vq =0;

                 for (col = 0; col < width/2; col++) {

                     encoded[pixel_ptr] = yq -= encoded[pixel_ptr];
                     encoded[pixel_ptr+1] = yq -= encoded[pixel_ptr+1];
                     encoded[pixel_ptr+2] = y1q -= encoded[pixel_ptr+2];
                     encoded[pixel_ptr+3] = y1q -= encoded[pixel_ptr+3];
                     encoded[pixel_ptr+4] = uq -= encoded[pixel_ptr+4];
                     encoded[pixel_ptr+5] = vq -= encoded[pixel_ptr+5];

                     pixel_ptr += 6;
                 }
             }
             break;
         default:

             av_log(avctx, AV_LOG_ERROR, "BUG! Unknown imagetype in pngfilter switch.\n");

             return -1;

         }
     }
 
     /* Convert colorspace */

     y_out = c->pic.data[0] + (height - 1) * c->pic.linesize[0];
     u_out = c->pic.data[1] + (height - 1) * c->pic.linesize[1];
     v_out = c->pic.data[2] + (height - 1) * c->pic.linesize[2];

     switch (c->imgtype) {
     case IMGTYPE_YUV111:

         for (row = 0; row < height; row++) {

             for (col = 0; col < width; col++) {

                 y_out[col] = *encoded++;
                 u_out[col] = *encoded++ + 128;
                 v_out[col] = *encoded++ + 128;

             }

             y_out -= c->pic.linesize[0];
             u_out -= c->pic.linesize[1];
             v_out -= c->pic.linesize[2];

         }
         break;
     case IMGTYPE_YUV422:

         for (row = 0; row < height; row++) {
             for (col = 0; col < width - 3; col += 4) {
                 memcpy(y_out + col, encoded, 4);
                 encoded += 4;
                 u_out[ col >> 1     ] = *encoded++ + 128;
                 u_out[(col >> 1) + 1] = *encoded++ + 128;
                 v_out[ col >> 1     ] = *encoded++ + 128;
                 v_out[(col >> 1) + 1] = *encoded++ + 128;

             }

             y_out -= c->pic.linesize[0];
             u_out -= c->pic.linesize[1];
             v_out -= c->pic.linesize[2];

         }
         break;
     case IMGTYPE_RGB24:
         for (row = height - 1; row >= 0; row--) {
             pixel_ptr = row * c->pic.linesize[0];

             memcpy(outptr + pixel_ptr, encoded, 3 * width);
             encoded += 3 * width;

         }
         break;
     case IMGTYPE_YUV411:

         for (row = 0; row < height; row++) {
             for (col = 0; col < width - 3; col += 4) {
                 memcpy(y_out + col, encoded, 4);
                 encoded += 4;
                 u_out[col >> 2] = *encoded++ + 128;
                 v_out[col >> 2] = *encoded++ + 128;

             }

             y_out -= c->pic.linesize[0];
             u_out -= c->pic.linesize[1];
             v_out -= c->pic.linesize[2];

         }
         break;
     case IMGTYPE_YUV211:

         for (row = 0; row < height; row++) {
             for (col = 0; col < width - 1; col += 2) {
                 memcpy(y_out + col, encoded, 2);
                 encoded += 2;
                 u_out[col >> 1] = *encoded++ + 128;
                 v_out[col >> 1] = *encoded++ + 128;

             }

             y_out -= c->pic.linesize[0];
             u_out -= c->pic.linesize[1];
             v_out -= c->pic.linesize[2];

         }
         break;
     case IMGTYPE_YUV420:

         u_out = c->pic.data[1] + ((height >> 1) - 1) * c->pic.linesize[1];
         v_out = c->pic.data[2] + ((height >> 1) - 1) * c->pic.linesize[2];
         for (row = 0; row < height - 1; row += 2) {
             for (col = 0; col < width - 1; col += 2) {
                 memcpy(y_out + col, encoded, 2);
                 encoded += 2;
                 memcpy(y_out + col - c->pic.linesize[0], encoded, 2);
                 encoded += 2;
                 u_out[col >> 1] = *encoded++ + 128;
                 v_out[col >> 1] = *encoded++ + 128;

             }

             y_out -= c->pic.linesize[0] << 1;
             u_out -= c->pic.linesize[1];
             v_out -= c->pic.linesize[2];

         }
         break;
     default:
         av_log(avctx, AV_LOG_ERROR, "BUG! Unknown imagetype in image decoder.\n");
         return -1;

     }
 
     *data_size = sizeof(AVFrame);
     *(AVFrame*)data = c->pic;
 
     /* always report that the buffer was completely consumed */
     return buf_size;
 }
 
 /*
  *
  * Init lcl decoder
  *
  */

 static av_cold int decode_init(AVCodecContext *avctx)

 {
     LclDecContext * const c = avctx->priv_data;
     unsigned int basesize = avctx->width * avctx->height;

     unsigned int max_basesize = FFALIGN(avctx->width, 4) * FFALIGN(avctx->height, 4) + AV_LZO_OUTPUT_PADDING;

     unsigned int max_decomp_size;
 

     avcodec_get_frame_defaults(&c->pic);

     if (avctx->extradata_size < 8) {
         av_log(avctx, AV_LOG_ERROR, "Extradata size too small.\n");

         return AVERROR_INVALIDDATA;

     }
 
     /* Check codec type */

     if ((avctx->codec_id == CODEC_ID_MSZH  && avctx->extradata[7] != CODEC_MSZH) ||
         (avctx->codec_id == CODEC_ID_ZLIB  && avctx->extradata[7] != CODEC_ZLIB)) {

         av_log(avctx, AV_LOG_ERROR, "Codec id and codec type mismatch. This should not happen.\n");
     }
 
     /* Detect image type */

     switch (c->imgtype = avctx->extradata[4]) {

     case IMGTYPE_YUV111:
         c->decomp_size = basesize * 3;
         max_decomp_size = max_basesize * 3;

         avctx->pix_fmt = PIX_FMT_YUV444P;

         av_log(avctx, AV_LOG_DEBUG, "Image type is YUV 1:1:1.\n");

         break;
     case IMGTYPE_YUV422:
         c->decomp_size = basesize * 2;
         max_decomp_size = max_basesize * 2;

         avctx->pix_fmt = PIX_FMT_YUV422P;

         av_log(avctx, AV_LOG_DEBUG, "Image type is YUV 4:2:2.\n");

         break;
     case IMGTYPE_RGB24:
         c->decomp_size = basesize * 3;
         max_decomp_size = max_basesize * 3;

         avctx->pix_fmt = PIX_FMT_BGR24;

         av_log(avctx, AV_LOG_DEBUG, "Image type is RGB 24.\n");

         break;
     case IMGTYPE_YUV411:
         c->decomp_size = basesize / 2 * 3;
         max_decomp_size = max_basesize / 2 * 3;

         avctx->pix_fmt = PIX_FMT_YUV411P;

         av_log(avctx, AV_LOG_DEBUG, "Image type is YUV 4:1:1.\n");

         break;
     case IMGTYPE_YUV211:
         c->decomp_size = basesize * 2;
         max_decomp_size = max_basesize * 2;

         avctx->pix_fmt = PIX_FMT_YUV422P;

         av_log(avctx, AV_LOG_DEBUG, "Image type is YUV 2:1:1.\n");

         break;
     case IMGTYPE_YUV420:
         c->decomp_size = basesize / 2 * 3;
         max_decomp_size = max_basesize / 2 * 3;

         avctx->pix_fmt = PIX_FMT_YUV420P;

         av_log(avctx, AV_LOG_DEBUG, "Image type is YUV 4:2:0.\n");

         break;
     default:
         av_log(avctx, AV_LOG_ERROR, "Unsupported image format %d.\n", c->imgtype);

         return AVERROR_INVALIDDATA;

     }
 
     /* Detect compression method */

     c->compression = (int8_t)avctx->extradata[5];

     switch (avctx->codec_id) {

     case CODEC_ID_MSZH:
         switch (c->compression) {
         case COMP_MSZH:

             av_log(avctx, AV_LOG_DEBUG, "Compression enabled.\n");

             break;

         case COMP_MSZH_NOCOMP:
             c->decomp_size = 0;

             av_log(avctx, AV_LOG_DEBUG, "No compression.\n");

             break;
         default:
             av_log(avctx, AV_LOG_ERROR, "Unsupported compression format for MSZH (%d).\n", c->compression);

             return AVERROR_INVALIDDATA;

         }
         break;

 #if CONFIG_ZLIB_DECODER

     case CODEC_ID_ZLIB:

         switch (c->compression) {
         case COMP_ZLIB_HISPEED:

             av_log(avctx, AV_LOG_DEBUG, "High speed compression.\n");

             break;
         case COMP_ZLIB_HICOMP:

             av_log(avctx, AV_LOG_DEBUG, "High compression.\n");

             break;
         case COMP_ZLIB_NORMAL:

             av_log(avctx, AV_LOG_DEBUG, "Normal compression.\n");

             break;
         default:

             if (c->compression < Z_NO_COMPRESSION || c->compression > Z_BEST_COMPRESSION) {

                 av_log(avctx, AV_LOG_ERROR, "Unsupported compression level for ZLIB: (%d).\n", c->compression);

                 return AVERROR_INVALIDDATA;

             }

             av_log(avctx, AV_LOG_DEBUG, "Compression level for ZLIB: (%d).\n", c->compression);

         }
         break;

 #endif

     default:
         av_log(avctx, AV_LOG_ERROR, "BUG! Unknown codec in compression switch.\n");

         return AVERROR_INVALIDDATA;

     }
 
     /* Allocate decompression buffer */
     if (c->decomp_size) {
         if ((c->decomp_buf = av_malloc(max_decomp_size)) == NULL) {
             av_log(avctx, AV_LOG_ERROR, "Can't allocate decompression buffer.\n");

             return AVERROR(ENOMEM);

         }
     }
 
     /* Detect flags */

     c->flags = avctx->extradata[6];

     if (c->flags & FLAG_MULTITHREAD)

         av_log(avctx, AV_LOG_DEBUG, "Multithread encoder flag set.\n");

     if (c->flags & FLAG_NULLFRAME)

         av_log(avctx, AV_LOG_DEBUG, "Nullframe insertion flag set.\n");

     if (avctx->codec_id == CODEC_ID_ZLIB && (c->flags & FLAG_PNGFILTER))

         av_log(avctx, AV_LOG_DEBUG, "PNG filter flag set.\n");

     if (c->flags & FLAGMASK_UNUSED)
         av_log(avctx, AV_LOG_ERROR, "Unknown flag set (%d).\n", c->flags);
 
     /* If needed init zlib */

 #if CONFIG_ZLIB_DECODER

     if (avctx->codec_id == CODEC_ID_ZLIB) {

         int zret;

         c->zstream.zalloc = Z_NULL;
         c->zstream.zfree = Z_NULL;
         c->zstream.opaque = Z_NULL;

         zret = inflateInit(&c->zstream);

         if (zret != Z_OK) {
             av_log(avctx, AV_LOG_ERROR, "Inflate init error: %d\n", zret);

             av_freep(&c->decomp_buf);

             return AVERROR_UNKNOWN;

         }
     }

 #endif

 
     return 0;
 }
 
 /*
  *
  * Uninit lcl decoder
  *
  */

 static av_cold int decode_end(AVCodecContext *avctx)

 {

     LclDecContext * const c = avctx->priv_data;

     av_freep(&c->decomp_buf);

     if (c->pic.data[0])
         avctx->release_buffer(avctx, &c->pic);

 #if CONFIG_ZLIB_DECODER

     if (avctx->codec_id == CODEC_ID_ZLIB)
         inflateEnd(&c->zstream);

 #endif
 

     return 0;

 }
 

 #if CONFIG_MSZH_DECODER

 AVCodec ff_mszh_decoder = {

     .name           = "mszh",
     .type           = AVMEDIA_TYPE_VIDEO,
     .id             = CODEC_ID_MSZH,
     .priv_data_size = sizeof(LclDecContext),
     .init           = decode_init,
     .close          = decode_end,
     .decode         = decode_frame,
     .capabilities   = CODEC_CAP_DR1,

     .long_name      = NULL_IF_CONFIG_SMALL("LCL (LossLess Codec Library) MSZH"),

 };
 #endif
 

 #if CONFIG_ZLIB_DECODER

 AVCodec ff_zlib_decoder = {

     .name           = "zlib",
     .type           = AVMEDIA_TYPE_VIDEO,
     .id             = CODEC_ID_ZLIB,
     .priv_data_size = sizeof(LclDecContext),
     .init           = decode_init,
     .close          = decode_end,
     .decode         = decode_frame,
     .capabilities   = CODEC_CAP_DR1,

     .long_name      = NULL_IF_CONFIG_SMALL("LCL (LossLess Codec Library) ZLIB"),

 };
 #endif