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)
43 #include "libavutil/avassert.h"
47 #include "libavutil/internal.h"
48 #include "libavutil/mem.h"
52 typedef struct LclEncContext {
54 AVCodecContext *avctx;
65 static int encode_frame(AVCodecContext *avctx, AVPacket *pkt,
66 const AVFrame *p, int *got_packet)
68 LclEncContext *c = avctx->priv_data;
70 int zret; // Zlib return code
71 int max_size = deflateBound(&c->zstream, avctx->width * avctx->height * 3);
73 if ((ret = ff_alloc_packet2(avctx, pkt, max_size, 0)) < 0)
76 if(avctx->pix_fmt != AV_PIX_FMT_BGR24){
77 av_log(avctx, AV_LOG_ERROR, "Format not supported!\n");
81 zret = deflateReset(&c->zstream);
83 av_log(avctx, AV_LOG_ERROR, "Deflate reset error: %d\n", zret);
86 c->zstream.next_out = pkt->data;
87 c->zstream.avail_out = pkt->size;
89 for(i = avctx->height - 1; i >= 0; i--) {
90 c->zstream.next_in = p->data[0]+p->linesize[0]*i;
91 c->zstream.avail_in = avctx->width*3;
92 zret = deflate(&c->zstream, Z_NO_FLUSH);
94 av_log(avctx, AV_LOG_ERROR, "Deflate error: %d\n", zret);
98 zret = deflate(&c->zstream, Z_FINISH);
99 if (zret != Z_STREAM_END) {
100 av_log(avctx, AV_LOG_ERROR, "Deflate error: %d\n", zret);
104 pkt->size = c->zstream.total_out;
105 pkt->flags |= AV_PKT_FLAG_KEY;
111 static av_cold int encode_init(AVCodecContext *avctx)
113 LclEncContext *c = avctx->priv_data;
114 int zret; // Zlib return code
118 av_assert0(avctx->width && avctx->height);
120 avctx->extradata = av_mallocz(8 + AV_INPUT_BUFFER_PADDING_SIZE);
121 if (!avctx->extradata)
122 return AVERROR(ENOMEM);
124 c->compression = avctx->compression_level == FF_COMPRESSION_DEFAULT ?
126 av_clip(avctx->compression_level, 0, 9);
128 c->imgtype = IMGTYPE_RGB24;
129 avctx->bits_per_coded_sample= 24;
131 avctx->extradata[0]= 4;
132 avctx->extradata[1]= 0;
133 avctx->extradata[2]= 0;
134 avctx->extradata[3]= 0;
135 avctx->extradata[4]= c->imgtype;
136 avctx->extradata[5]= c->compression;
137 avctx->extradata[6]= c->flags;
138 avctx->extradata[7]= CODEC_ZLIB;
139 c->avctx->extradata_size= 8;
141 c->zstream.zalloc = Z_NULL;
142 c->zstream.zfree = Z_NULL;
143 c->zstream.opaque = Z_NULL;
144 zret = deflateInit(&c->zstream, c->compression);
146 av_log(avctx, AV_LOG_ERROR, "Deflate init error: %d\n", zret);
147 return AVERROR_UNKNOWN;
153 static av_cold int encode_end(AVCodecContext *avctx)
155 LclEncContext *c = avctx->priv_data;
157 av_freep(&avctx->extradata);
158 deflateEnd(&c->zstream);
163 const AVCodec ff_zlib_encoder = {
165 .long_name = NULL_IF_CONFIG_SMALL("LCL (LossLess Codec Library) ZLIB"),
166 .type = AVMEDIA_TYPE_VIDEO,
167 .id = AV_CODEC_ID_ZLIB,
168 .priv_data_size = sizeof(LclEncContext),
170 .encode2 = encode_frame,
172 .capabilities = AV_CODEC_CAP_FRAME_THREADS,
173 .pix_fmts = (const enum AVPixelFormat[]) { AV_PIX_FMT_BGR24, AV_PIX_FMT_NONE },
174 .caps_internal = FF_CODEC_CAP_INIT_THREADSAFE |
175 FF_CODEC_CAP_INIT_CLEANUP,