2 * LCL (LossLess Codec Library) Codec
3 * Copyright (c) 2002-2004 Roberto Togni
5 * This file is part of FFmpeg.
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.
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.
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
23 * @file libavcodec/lclenc.c
24 * LCL (LossLess Codec Library) Video Codec
25 * Decoder for MSZH and ZLIB codecs
26 * Experimental encoder for ZLIB RGB24
31 * Ver2.23 By Kenji Oshima 2000.09.20
32 * avimszh.dll, avizlib.dll
34 * A description of the decoding algorithm can be found here:
35 * http://www.pcisys.net/~melanson/codecs
37 * Supports: BGR24 (RGB 24bpp)
53 typedef struct LclEncContext {
55 AVCodecContext *avctx;
65 // Decompressed data size
66 unsigned int decomp_size;
67 // Maximum compressed data size
68 unsigned int max_comp_size;
70 unsigned char* comp_buf;
79 static int encode_frame(AVCodecContext *avctx, unsigned char *buf, int buf_size, void *data){
80 LclEncContext *c = avctx->priv_data;
82 AVFrame * const p = &c->pic;
84 int zret; // Zlib return code
87 p->pict_type= FF_I_TYPE;
90 if(avctx->pix_fmt != PIX_FMT_BGR24){
91 av_log(avctx, AV_LOG_ERROR, "Format not supported!\n");
95 zret = deflateReset(&c->zstream);
97 av_log(avctx, AV_LOG_ERROR, "Deflate reset error: %d\n", zret);
100 c->zstream.next_out = buf;
101 c->zstream.avail_out = buf_size;
103 for(i = avctx->height - 1; i >= 0; i--) {
104 c->zstream.next_in = p->data[0]+p->linesize[0]*i;
105 c->zstream.avail_in = avctx->width*3;
106 zret = deflate(&c->zstream, Z_NO_FLUSH);
108 av_log(avctx, AV_LOG_ERROR, "Deflate error: %d\n", zret);
112 zret = deflate(&c->zstream, Z_FINISH);
113 if (zret != Z_STREAM_END) {
114 av_log(avctx, AV_LOG_ERROR, "Deflate error: %d\n", zret);
118 return c->zstream.total_out;
126 static av_cold int encode_init(AVCodecContext *avctx)
128 LclEncContext *c = avctx->priv_data;
129 int zret; // Zlib return code
133 assert(avctx->width && avctx->height);
135 avctx->extradata= av_mallocz(8);
136 avctx->coded_frame= &c->pic;
138 // Will be user settable someday
142 switch(avctx->pix_fmt){
144 c->imgtype = IMGTYPE_RGB24;
145 c->decomp_size = avctx->width * avctx->height * 3;
146 avctx->bits_per_coded_sample= 24;
149 av_log(avctx, AV_LOG_ERROR, "Input pixel format %s not supported\n", avcodec_get_pix_fmt_name(avctx->pix_fmt));
153 avctx->extradata[0]= 4;
154 avctx->extradata[1]= 0;
155 avctx->extradata[2]= 0;
156 avctx->extradata[3]= 0;
157 avctx->extradata[4]= c->imgtype;
158 avctx->extradata[5]= c->compression;
159 avctx->extradata[6]= c->flags;
160 avctx->extradata[7]= CODEC_ZLIB;
161 c->avctx->extradata_size= 8;
163 c->zstream.zalloc = Z_NULL;
164 c->zstream.zfree = Z_NULL;
165 c->zstream.opaque = Z_NULL;
166 zret = deflateInit(&c->zstream, c->compression);
168 av_log(avctx, AV_LOG_ERROR, "Deflate init error: %d\n", zret);
180 static av_cold int encode_end(AVCodecContext *avctx)
182 LclEncContext *c = avctx->priv_data;
184 av_freep(&avctx->extradata);
185 av_freep(&c->comp_buf);
186 deflateEnd(&c->zstream);
191 AVCodec zlib_encoder = {
195 sizeof(LclEncContext),
199 .long_name = NULL_IF_CONFIG_SMALL("LCL (LossLess Codec Library) ZLIB"),