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
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)
44 #include "libavutil/avassert.h"
54 typedef struct LclEncContext {
56 AVCodecContext *avctx;
73 static int encode_frame(AVCodecContext *avctx, AVPacket *pkt,
74 const AVFrame *pict, int *got_packet)
76 LclEncContext *c = avctx->priv_data;
77 AVFrame * const p = &c->pic;
79 int zret; // Zlib return code
80 int max_size = deflateBound(&c->zstream, avctx->width * avctx->height * 3);
82 if ((ret = ff_alloc_packet2(avctx, pkt, max_size)) < 0)
86 p->pict_type= AV_PICTURE_TYPE_I;
89 if(avctx->pix_fmt != PIX_FMT_BGR24){
90 av_log(avctx, AV_LOG_ERROR, "Format not supported!\n");
94 zret = deflateReset(&c->zstream);
96 av_log(avctx, AV_LOG_ERROR, "Deflate reset error: %d\n", zret);
99 c->zstream.next_out = pkt->data;
100 c->zstream.avail_out = pkt->size;
102 for(i = avctx->height - 1; i >= 0; i--) {
103 c->zstream.next_in = p->data[0]+p->linesize[0]*i;
104 c->zstream.avail_in = avctx->width*3;
105 zret = deflate(&c->zstream, Z_NO_FLUSH);
107 av_log(avctx, AV_LOG_ERROR, "Deflate error: %d\n", zret);
111 zret = deflate(&c->zstream, Z_FINISH);
112 if (zret != Z_STREAM_END) {
113 av_log(avctx, AV_LOG_ERROR, "Deflate error: %d\n", zret);
117 pkt->size = c->zstream.total_out;
118 pkt->flags |= AV_PKT_FLAG_KEY;
129 static av_cold int encode_init(AVCodecContext *avctx)
131 LclEncContext *c = avctx->priv_data;
132 int zret; // Zlib return code
136 av_assert0(avctx->width && avctx->height);
138 avctx->extradata= av_mallocz(8);
139 avctx->coded_frame= &c->pic;
141 // Will be user settable someday
144 c->imgtype = IMGTYPE_RGB24;
145 avctx->bits_per_coded_sample= 24;
147 avctx->extradata[0]= 4;
148 avctx->extradata[1]= 0;
149 avctx->extradata[2]= 0;
150 avctx->extradata[3]= 0;
151 avctx->extradata[4]= c->imgtype;
152 avctx->extradata[5]= c->compression;
153 avctx->extradata[6]= c->flags;
154 avctx->extradata[7]= CODEC_ZLIB;
155 c->avctx->extradata_size= 8;
157 c->zstream.zalloc = Z_NULL;
158 c->zstream.zfree = Z_NULL;
159 c->zstream.opaque = Z_NULL;
160 zret = deflateInit(&c->zstream, c->compression);
162 av_log(avctx, AV_LOG_ERROR, "Deflate init error: %d\n", zret);
174 static av_cold int encode_end(AVCodecContext *avctx)
176 LclEncContext *c = avctx->priv_data;
178 av_freep(&avctx->extradata);
179 deflateEnd(&c->zstream);
184 AVCodec ff_zlib_encoder = {
186 .type = AVMEDIA_TYPE_VIDEO,
188 .priv_data_size = sizeof(LclEncContext),
190 .encode2 = encode_frame,
192 .pix_fmts = (const enum PixelFormat[]) { PIX_FMT_BGR24, PIX_FMT_NONE },
193 .long_name = NULL_IF_CONFIG_SMALL("LCL (LossLess Codec Library) ZLIB"),