From 00eb27f1111482ef3b698f8344cfb9d71ecf95ef Mon Sep 17 00:00:00 2001 From: Måns Rullgård Date: Thu, 12 Jul 2007 22:40:33 +0000 Subject: split lcl.c into lcldec.c, lclenc.c, lcl.h Originally committed as revision 9613 to svn://svn.ffmpeg.org/ffmpeg/trunk --- libavcodec/lclenc.c | 231 ++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 231 insertions(+) create mode 100644 libavcodec/lclenc.c (limited to 'libavcodec/lclenc.c') diff --git a/libavcodec/lclenc.c b/libavcodec/lclenc.c new file mode 100644 index 0000000000..e8349052af --- /dev/null +++ b/libavcodec/lclenc.c @@ -0,0 +1,231 @@ +/* + * LCL (LossLess Codec Library) Codec + * Copyright (c) 2002-2004 Roberto Togni + * + * This file is part of FFmpeg. + * + * FFmpeg is free software; you can redistribute it and/or + * modify it under the terms of the GNU Lesser General Public + * License as published by the Free Software Foundation; either + * version 2.1 of the License, or (at your option) any later version. + * + * FFmpeg is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * Lesser General Public License for more details. + * + * You should have received a copy of the GNU Lesser General Public + * License along with FFmpeg; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA + */ + +/** + * @file lcl.c + * LCL (LossLess Codec Library) Video Codec + * Decoder for MSZH and ZLIB codecs + * Experimental encoder for ZLIB RGB24 + * + * Fourcc: MSZH, ZLIB + * + * Original Win32 dll: + * Ver2.23 By Kenji Oshima 2000.09.20 + * avimszh.dll, avizlib.dll + * + * A description of the decoding algorithm can be found here: + * http://www.pcisys.net/~melanson/codecs + * + * Supports: BGR24 (RGB 24bpp) + * + */ + +#include +#include + +#include "avcodec.h" +#include "bitstream.h" +#include "lcl.h" + +#ifdef CONFIG_ZLIB +#include +#endif + +/* + * Decoder context + */ +typedef struct LclEncContext { + + AVCodecContext *avctx; + AVFrame pic; + PutBitContext pb; + + // Image type + int imgtype; + // Compression type + int compression; + // Flags + int flags; + // Decompressed data size + unsigned int decomp_size; + // Maximum compressed data size + unsigned int max_comp_size; + // Compression buffer + unsigned char* comp_buf; +#ifdef CONFIG_ZLIB + z_stream zstream; +#endif +} LclEncContext; + +/* + * + * Encode a frame + * + */ +static int encode_frame(AVCodecContext *avctx, unsigned char *buf, int buf_size, void *data){ + LclEncContext *c = avctx->priv_data; + AVFrame *pict = data; + AVFrame * const p = &c->pic; + int i; + int zret; // Zlib return code + +#ifndef CONFIG_ZLIB + av_log(avctx, AV_LOG_ERROR, "Zlib support not compiled in.\n"); + return -1; +#else + + init_put_bits(&c->pb, buf, buf_size); + + *p = *pict; + p->pict_type= FF_I_TYPE; + p->key_frame= 1; + + if(avctx->pix_fmt != PIX_FMT_BGR24){ + av_log(avctx, AV_LOG_ERROR, "Format not supported!\n"); + return -1; + } + + zret = deflateReset(&(c->zstream)); + if (zret != Z_OK) { + av_log(avctx, AV_LOG_ERROR, "Deflate reset error: %d\n", zret); + return -1; + } + c->zstream.next_out = c->comp_buf; + c->zstream.avail_out = c->max_comp_size; + + for(i = avctx->height - 1; i >= 0; i--) { + c->zstream.next_in = p->data[0]+p->linesize[0]*i; + c->zstream.avail_in = avctx->width*3; + zret = deflate(&(c->zstream), Z_NO_FLUSH); + if (zret != Z_OK) { + av_log(avctx, AV_LOG_ERROR, "Deflate error: %d\n", zret); + return -1; + } + } + zret = deflate(&(c->zstream), Z_FINISH); + if (zret != Z_STREAM_END) { + av_log(avctx, AV_LOG_ERROR, "Deflate error: %d\n", zret); + return -1; + } + + for (i = 0; i < c->zstream.total_out; i++) + put_bits(&c->pb, 8, c->comp_buf[i]); + flush_put_bits(&c->pb); + + return c->zstream.total_out; +#endif +} + +/* + * + * Init lcl encoder + * + */ +static int encode_init(AVCodecContext *avctx) +{ + LclEncContext *c = avctx->priv_data; + int zret; // Zlib return code + +#ifndef CONFIG_ZLIB + av_log(avctx, AV_LOG_ERROR, "Zlib support not compiled.\n"); + return 1; +#else + + c->avctx= avctx; + + assert(avctx->width && avctx->height); + + avctx->extradata= av_mallocz(8); + avctx->coded_frame= &c->pic; + + // Will be user settable someday + c->compression = 6; + c->flags = 0; + + switch(avctx->pix_fmt){ + case PIX_FMT_BGR24: + c->imgtype = IMGTYPE_RGB24; + c->decomp_size = avctx->width * avctx->height * 3; + avctx->bits_per_sample= 24; + break; + default: + av_log(avctx, AV_LOG_ERROR, "Format %d not supported\n", avctx->pix_fmt); + return -1; + } + + ((uint8_t*)avctx->extradata)[0]= 4; + ((uint8_t*)avctx->extradata)[1]= 0; + ((uint8_t*)avctx->extradata)[2]= 0; + ((uint8_t*)avctx->extradata)[3]= 0; + ((uint8_t*)avctx->extradata)[4]= c->imgtype; + ((uint8_t*)avctx->extradata)[5]= c->compression; + ((uint8_t*)avctx->extradata)[6]= c->flags; + ((uint8_t*)avctx->extradata)[7]= CODEC_ZLIB; + c->avctx->extradata_size= 8; + + c->zstream.zalloc = Z_NULL; + c->zstream.zfree = Z_NULL; + c->zstream.opaque = Z_NULL; + zret = deflateInit(&(c->zstream), c->compression); + if (zret != Z_OK) { + av_log(avctx, AV_LOG_ERROR, "Deflate init error: %d\n", zret); + return 1; + } + + /* Conservative upper bound taken from zlib v1.2.1 source */ + c->max_comp_size = c->decomp_size + ((c->decomp_size + 7) >> 3) + + ((c->decomp_size + 63) >> 6) + 11; + if ((c->comp_buf = av_malloc(c->max_comp_size)) == NULL) { + av_log(avctx, AV_LOG_ERROR, "Can't allocate compression buffer.\n"); + return 1; + } + + return 0; +#endif +} + +/* + * + * Uninit lcl encoder + * + */ +static int encode_end(AVCodecContext *avctx) +{ + LclEncContext *c = avctx->priv_data; + + av_freep(&avctx->extradata); + av_freep(&c->comp_buf); +#ifdef CONFIG_ZLIB + deflateEnd(&(c->zstream)); +#endif + + return 0; +} + +AVCodec zlib_encoder = { + "zlib", + CODEC_TYPE_VIDEO, + CODEC_ID_ZLIB, + sizeof(LclEncContext), + encode_init, + encode_frame, + encode_end, +}; -- cgit v1.2.3