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* LCL (LossLess Codec Library) Codec
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* Copyright (c) 2002-2004 Roberto Togni
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* This file is part of FFmpeg.
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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* LCL (LossLess Codec Library) Video Codec
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* Decoder for MSZH and ZLIB codecs
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* Experimental encoder for ZLIB RGB24
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* Ver2.23 By Kenji Oshima 2000.09.20
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* avimszh.dll, avizlib.dll
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* A description of the decoding algorithm can be found here:
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* http://www.pcisys.net/~melanson/codecs
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* Supports: BGR24 (RGB 24bpp)
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#include "bitstream.h"
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typedef struct LclEncContext {
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AVCodecContext *avctx;
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// Decompressed data size
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unsigned int decomp_size;
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// Maximum compressed data size
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unsigned int max_comp_size;
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unsigned char* comp_buf;
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static int encode_frame(AVCodecContext *avctx, unsigned char *buf, int buf_size, void *data){
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LclEncContext *c = avctx->priv_data;
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AVFrame * const p = &c->pic;
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int zret; // Zlib return code
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av_log(avctx, AV_LOG_ERROR, "Zlib support not compiled in.\n");
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init_put_bits(&c->pb, buf, buf_size);
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p->pict_type= FF_I_TYPE;
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if(avctx->pix_fmt != PIX_FMT_BGR24){
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av_log(avctx, AV_LOG_ERROR, "Format not supported!\n");
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zret = deflateReset(&(c->zstream));
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av_log(avctx, AV_LOG_ERROR, "Deflate reset error: %d\n", zret);
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c->zstream.next_out = c->comp_buf;
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c->zstream.avail_out = c->max_comp_size;
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for(i = avctx->height - 1; i >= 0; i--) {
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c->zstream.next_in = p->data[0]+p->linesize[0]*i;
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c->zstream.avail_in = avctx->width*3;
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zret = deflate(&(c->zstream), Z_NO_FLUSH);
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av_log(avctx, AV_LOG_ERROR, "Deflate error: %d\n", zret);
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zret = deflate(&(c->zstream), Z_FINISH);
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if (zret != Z_STREAM_END) {
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av_log(avctx, AV_LOG_ERROR, "Deflate error: %d\n", zret);
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for (i = 0; i < c->zstream.total_out; i++)
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put_bits(&c->pb, 8, c->comp_buf[i]);
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flush_put_bits(&c->pb);
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return c->zstream.total_out;
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static av_cold int encode_init(AVCodecContext *avctx)
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LclEncContext *c = avctx->priv_data;
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int zret; // Zlib return code
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av_log(avctx, AV_LOG_ERROR, "Zlib support not compiled.\n");
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assert(avctx->width && avctx->height);
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avctx->extradata= av_mallocz(8);
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avctx->coded_frame= &c->pic;
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// Will be user settable someday
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switch(avctx->pix_fmt){
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c->imgtype = IMGTYPE_RGB24;
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c->decomp_size = avctx->width * avctx->height * 3;
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avctx->bits_per_sample= 24;
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av_log(avctx, AV_LOG_ERROR, "Format %d not supported\n", avctx->pix_fmt);
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((uint8_t*)avctx->extradata)[0]= 4;
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((uint8_t*)avctx->extradata)[1]= 0;
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((uint8_t*)avctx->extradata)[2]= 0;
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((uint8_t*)avctx->extradata)[3]= 0;
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((uint8_t*)avctx->extradata)[4]= c->imgtype;
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((uint8_t*)avctx->extradata)[5]= c->compression;
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((uint8_t*)avctx->extradata)[6]= c->flags;
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((uint8_t*)avctx->extradata)[7]= CODEC_ZLIB;
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c->avctx->extradata_size= 8;
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c->zstream.zalloc = Z_NULL;
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c->zstream.zfree = Z_NULL;
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c->zstream.opaque = Z_NULL;
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zret = deflateInit(&(c->zstream), c->compression);
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av_log(avctx, AV_LOG_ERROR, "Deflate init error: %d\n", zret);
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/* Conservative upper bound taken from zlib v1.2.1 source */
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c->max_comp_size = c->decomp_size + ((c->decomp_size + 7) >> 3) +
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((c->decomp_size + 63) >> 6) + 11;
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if ((c->comp_buf = av_malloc(c->max_comp_size)) == NULL) {
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av_log(avctx, AV_LOG_ERROR, "Can't allocate compression buffer.\n");
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static av_cold int encode_end(AVCodecContext *avctx)
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LclEncContext *c = avctx->priv_data;
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av_freep(&avctx->extradata);
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av_freep(&c->comp_buf);
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deflateEnd(&(c->zstream));
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AVCodec zlib_encoder = {
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sizeof(LclEncContext),
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.long_name = "LCL (LossLess Codec Library) ZLIB",