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)
45 #include "bitstream.h"
55 typedef struct LclEncContext {
57 AVCodecContext *avctx;
67 // Decompressed data size
68 unsigned int decomp_size;
69 // Maximum compressed data size
70 unsigned int max_comp_size;
72 unsigned char* comp_buf;
83 static int encode_frame(AVCodecContext *avctx, unsigned char *buf, int buf_size, void *data){
84 LclEncContext *c = avctx->priv_data;
86 AVFrame * const p = &c->pic;
88 int zret; // Zlib return code
91 av_log(avctx, AV_LOG_ERROR, "Zlib support not compiled in.\n");
95 init_put_bits(&c->pb, buf, buf_size);
98 p->pict_type= FF_I_TYPE;
101 if(avctx->pix_fmt != PIX_FMT_BGR24){
102 av_log(avctx, AV_LOG_ERROR, "Format not supported!\n");
106 zret = deflateReset(&(c->zstream));
108 av_log(avctx, AV_LOG_ERROR, "Deflate reset error: %d\n", zret);
111 c->zstream.next_out = c->comp_buf;
112 c->zstream.avail_out = c->max_comp_size;
114 for(i = avctx->height - 1; i >= 0; i--) {
115 c->zstream.next_in = p->data[0]+p->linesize[0]*i;
116 c->zstream.avail_in = avctx->width*3;
117 zret = deflate(&(c->zstream), Z_NO_FLUSH);
119 av_log(avctx, AV_LOG_ERROR, "Deflate error: %d\n", zret);
123 zret = deflate(&(c->zstream), Z_FINISH);
124 if (zret != Z_STREAM_END) {
125 av_log(avctx, AV_LOG_ERROR, "Deflate error: %d\n", zret);
129 for (i = 0; i < c->zstream.total_out; i++)
130 put_bits(&c->pb, 8, c->comp_buf[i]);
131 flush_put_bits(&c->pb);
133 return c->zstream.total_out;
142 static av_cold int encode_init(AVCodecContext *avctx)
144 LclEncContext *c = avctx->priv_data;
145 int zret; // Zlib return code
148 av_log(avctx, AV_LOG_ERROR, "Zlib support not compiled.\n");
154 assert(avctx->width && avctx->height);
156 avctx->extradata= av_mallocz(8);
157 avctx->coded_frame= &c->pic;
159 // Will be user settable someday
163 switch(avctx->pix_fmt){
165 c->imgtype = IMGTYPE_RGB24;
166 c->decomp_size = avctx->width * avctx->height * 3;
167 avctx->bits_per_sample= 24;
170 av_log(avctx, AV_LOG_ERROR, "Input pixel format %s not supported\n", avcodec_get_pix_fmt_name(avctx->pix_fmt));
174 ((uint8_t*)avctx->extradata)[0]= 4;
175 ((uint8_t*)avctx->extradata)[1]= 0;
176 ((uint8_t*)avctx->extradata)[2]= 0;
177 ((uint8_t*)avctx->extradata)[3]= 0;
178 ((uint8_t*)avctx->extradata)[4]= c->imgtype;
179 ((uint8_t*)avctx->extradata)[5]= c->compression;
180 ((uint8_t*)avctx->extradata)[6]= c->flags;
181 ((uint8_t*)avctx->extradata)[7]= CODEC_ZLIB;
182 c->avctx->extradata_size= 8;
184 c->zstream.zalloc = Z_NULL;
185 c->zstream.zfree = Z_NULL;
186 c->zstream.opaque = Z_NULL;
187 zret = deflateInit(&(c->zstream), c->compression);
189 av_log(avctx, AV_LOG_ERROR, "Deflate init error: %d\n", zret);
193 /* Conservative upper bound taken from zlib v1.2.1 source */
194 c->max_comp_size = c->decomp_size + ((c->decomp_size + 7) >> 3) +
195 ((c->decomp_size + 63) >> 6) + 11;
196 if ((c->comp_buf = av_malloc(c->max_comp_size)) == NULL) {
197 av_log(avctx, AV_LOG_ERROR, "Can't allocate compression buffer.\n");
210 static av_cold int encode_end(AVCodecContext *avctx)
212 LclEncContext *c = avctx->priv_data;
214 av_freep(&avctx->extradata);
215 av_freep(&c->comp_buf);
217 deflateEnd(&(c->zstream));
223 AVCodec zlib_encoder = {
227 sizeof(LclEncContext),
231 .long_name = NULL_IF_CONFIG_SMALL("LCL (LossLess Codec Library) ZLIB"),