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"
48 #include "libavutil/internal.h"
49 #include "libavutil/mem.h"
56 typedef struct LclEncContext {
58 AVCodecContext *avctx;
75 static int encode_frame(AVCodecContext *avctx, AVPacket *pkt,
76 const AVFrame *pict, int *got_packet)
78 LclEncContext *c = avctx->priv_data;
79 AVFrame * const p = &c->pic;
81 int zret; // Zlib return code
82 int max_size = deflateBound(&c->zstream, avctx->width * avctx->height * 3);
84 if ((ret = ff_alloc_packet2(avctx, pkt, max_size)) < 0)
88 p->pict_type= AV_PICTURE_TYPE_I;
91 if(avctx->pix_fmt != AV_PIX_FMT_BGR24){
92 av_log(avctx, AV_LOG_ERROR, "Format not supported!\n");
96 zret = deflateReset(&c->zstream);
98 av_log(avctx, AV_LOG_ERROR, "Deflate reset error: %d\n", zret);
101 c->zstream.next_out = pkt->data;
102 c->zstream.avail_out = pkt->size;
104 for(i = avctx->height - 1; i >= 0; i--) {
105 c->zstream.next_in = p->data[0]+p->linesize[0]*i;
106 c->zstream.avail_in = avctx->width*3;
107 zret = deflate(&c->zstream, Z_NO_FLUSH);
109 av_log(avctx, AV_LOG_ERROR, "Deflate error: %d\n", zret);
113 zret = deflate(&c->zstream, Z_FINISH);
114 if (zret != Z_STREAM_END) {
115 av_log(avctx, AV_LOG_ERROR, "Deflate error: %d\n", zret);
119 pkt->size = c->zstream.total_out;
120 pkt->flags |= AV_PKT_FLAG_KEY;
131 static av_cold int encode_init(AVCodecContext *avctx)
133 LclEncContext *c = avctx->priv_data;
134 int zret; // Zlib return code
138 av_assert0(avctx->width && avctx->height);
140 avctx->extradata= av_mallocz(8);
141 avctx->coded_frame= &c->pic;
143 c->compression = avctx->compression_level == FF_COMPRESSION_DEFAULT ?
145 av_clip(avctx->compression_level, 0, 9);
147 c->imgtype = IMGTYPE_RGB24;
148 avctx->bits_per_coded_sample= 24;
150 avctx->extradata[0]= 4;
151 avctx->extradata[1]= 0;
152 avctx->extradata[2]= 0;
153 avctx->extradata[3]= 0;
154 avctx->extradata[4]= c->imgtype;
155 avctx->extradata[5]= c->compression;
156 avctx->extradata[6]= c->flags;
157 avctx->extradata[7]= CODEC_ZLIB;
158 c->avctx->extradata_size= 8;
160 c->zstream.zalloc = Z_NULL;
161 c->zstream.zfree = Z_NULL;
162 c->zstream.opaque = Z_NULL;
163 zret = deflateInit(&c->zstream, c->compression);
165 av_log(avctx, AV_LOG_ERROR, "Deflate init error: %d\n", zret);
177 static av_cold int encode_end(AVCodecContext *avctx)
179 LclEncContext *c = avctx->priv_data;
181 av_freep(&avctx->extradata);
182 deflateEnd(&c->zstream);
187 AVCodec ff_zlib_encoder = {
189 .type = AVMEDIA_TYPE_VIDEO,
190 .id = AV_CODEC_ID_ZLIB,
191 .priv_data_size = sizeof(LclEncContext),
193 .encode2 = encode_frame,
195 .pix_fmts = (const enum AVPixelFormat[]) { AV_PIX_FMT_BGR24, AV_PIX_FMT_NONE },
196 .long_name = NULL_IF_CONFIG_SMALL("LCL (LossLess Codec Library) ZLIB"),