yading@10: /*
yading@10:  * LCL (LossLess Codec Library) Codec
yading@10:  * Copyright (c) 2002-2004 Roberto Togni
yading@10:  *
yading@10:  * This file is part of FFmpeg.
yading@10:  *
yading@10:  * FFmpeg is free software; you can redistribute it and/or
yading@10:  * modify it under the terms of the GNU Lesser General Public
yading@10:  * License as published by the Free Software Foundation; either
yading@10:  * version 2.1 of the License, or (at your option) any later version.
yading@10:  *
yading@10:  * FFmpeg is distributed in the hope that it will be useful,
yading@10:  * but WITHOUT ANY WARRANTY; without even the implied warranty of
yading@10:  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
yading@10:  * Lesser General Public License for more details.
yading@10:  *
yading@10:  * You should have received a copy of the GNU Lesser General Public
yading@10:  * License along with FFmpeg; if not, write to the Free Software
yading@10:  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
yading@10:  */
yading@10: 
yading@10: /**
yading@10:  * @file
yading@10:  * LCL (LossLess Codec Library) Video Codec
yading@10:  * Decoder for MSZH and ZLIB codecs
yading@10:  * Experimental encoder for ZLIB RGB24
yading@10:  *
yading@10:  * Fourcc: MSZH, ZLIB
yading@10:  *
yading@10:  * Original Win32 dll:
yading@10:  * Ver2.23 By Kenji Oshima 2000.09.20
yading@10:  * avimszh.dll, avizlib.dll
yading@10:  *
yading@10:  * A description of the decoding algorithm can be found here:
yading@10:  *   http://www.pcisys.net/~melanson/codecs
yading@10:  *
yading@10:  * Supports: BGR24 (RGB 24bpp)
yading@10:  *
yading@10:  */
yading@10: 
yading@10: #include <stdio.h>
yading@10: #include <stdlib.h>
yading@10: 
yading@10: #include "libavutil/avassert.h"
yading@10: #include "avcodec.h"
yading@10: #include "internal.h"
yading@10: #include "lcl.h"
yading@10: #include "libavutil/internal.h"
yading@10: #include "libavutil/mem.h"
yading@10: 
yading@10: #include <zlib.h>
yading@10: 
yading@10: /*
yading@10:  * Decoder context
yading@10:  */
yading@10: typedef struct LclEncContext {
yading@10: 
yading@10:     AVCodecContext *avctx;
yading@10:     AVFrame pic;
yading@10: 
yading@10:     // Image type
yading@10:     int imgtype;
yading@10:     // Compression type
yading@10:     int compression;
yading@10:     // Flags
yading@10:     int flags;
yading@10:     z_stream zstream;
yading@10: } LclEncContext;
yading@10: 
yading@10: /*
yading@10:  *
yading@10:  * Encode a frame
yading@10:  *
yading@10:  */
yading@10: static int encode_frame(AVCodecContext *avctx, AVPacket *pkt,
yading@10:                         const AVFrame *pict, int *got_packet)
yading@10: {
yading@10:     LclEncContext *c = avctx->priv_data;
yading@10:     AVFrame * const p = &c->pic;
yading@10:     int i, ret;
yading@10:     int zret; // Zlib return code
yading@10:     int max_size = deflateBound(&c->zstream, avctx->width * avctx->height * 3);
yading@10: 
yading@10:     if ((ret = ff_alloc_packet2(avctx, pkt, max_size)) < 0)
yading@10:             return ret;
yading@10: 
yading@10:     *p = *pict;
yading@10:     p->pict_type= AV_PICTURE_TYPE_I;
yading@10:     p->key_frame= 1;
yading@10: 
yading@10:     if(avctx->pix_fmt != AV_PIX_FMT_BGR24){
yading@10:         av_log(avctx, AV_LOG_ERROR, "Format not supported!\n");
yading@10:         return -1;
yading@10:     }
yading@10: 
yading@10:     zret = deflateReset(&c->zstream);
yading@10:     if (zret != Z_OK) {
yading@10:         av_log(avctx, AV_LOG_ERROR, "Deflate reset error: %d\n", zret);
yading@10:         return -1;
yading@10:     }
yading@10:     c->zstream.next_out  = pkt->data;
yading@10:     c->zstream.avail_out = pkt->size;
yading@10: 
yading@10:     for(i = avctx->height - 1; i >= 0; i--) {
yading@10:         c->zstream.next_in = p->data[0]+p->linesize[0]*i;
yading@10:         c->zstream.avail_in = avctx->width*3;
yading@10:         zret = deflate(&c->zstream, Z_NO_FLUSH);
yading@10:         if (zret != Z_OK) {
yading@10:             av_log(avctx, AV_LOG_ERROR, "Deflate error: %d\n", zret);
yading@10:             return -1;
yading@10:         }
yading@10:     }
yading@10:     zret = deflate(&c->zstream, Z_FINISH);
yading@10:     if (zret != Z_STREAM_END) {
yading@10:         av_log(avctx, AV_LOG_ERROR, "Deflate error: %d\n", zret);
yading@10:         return -1;
yading@10:     }
yading@10: 
yading@10:     pkt->size   = c->zstream.total_out;
yading@10:     pkt->flags |= AV_PKT_FLAG_KEY;
yading@10:     *got_packet = 1;
yading@10: 
yading@10:     return 0;
yading@10: }
yading@10: 
yading@10: /*
yading@10:  *
yading@10:  * Init lcl encoder
yading@10:  *
yading@10:  */
yading@10: static av_cold int encode_init(AVCodecContext *avctx)
yading@10: {
yading@10:     LclEncContext *c = avctx->priv_data;
yading@10:     int zret; // Zlib return code
yading@10: 
yading@10:     c->avctx= avctx;
yading@10: 
yading@10:     av_assert0(avctx->width && avctx->height);
yading@10: 
yading@10:     avctx->extradata= av_mallocz(8);
yading@10:     avctx->coded_frame= &c->pic;
yading@10: 
yading@10:     c->compression = avctx->compression_level == FF_COMPRESSION_DEFAULT ?
yading@10:                             COMP_ZLIB_NORMAL :
yading@10:                             av_clip(avctx->compression_level, 0, 9);
yading@10:     c->flags = 0;
yading@10:     c->imgtype = IMGTYPE_RGB24;
yading@10:     avctx->bits_per_coded_sample= 24;
yading@10: 
yading@10:     avctx->extradata[0]= 4;
yading@10:     avctx->extradata[1]= 0;
yading@10:     avctx->extradata[2]= 0;
yading@10:     avctx->extradata[3]= 0;
yading@10:     avctx->extradata[4]= c->imgtype;
yading@10:     avctx->extradata[5]= c->compression;
yading@10:     avctx->extradata[6]= c->flags;
yading@10:     avctx->extradata[7]= CODEC_ZLIB;
yading@10:     c->avctx->extradata_size= 8;
yading@10: 
yading@10:     c->zstream.zalloc = Z_NULL;
yading@10:     c->zstream.zfree = Z_NULL;
yading@10:     c->zstream.opaque = Z_NULL;
yading@10:     zret = deflateInit(&c->zstream, c->compression);
yading@10:     if (zret != Z_OK) {
yading@10:         av_log(avctx, AV_LOG_ERROR, "Deflate init error: %d\n", zret);
yading@10:         return 1;
yading@10:     }
yading@10: 
yading@10:     return 0;
yading@10: }
yading@10: 
yading@10: /*
yading@10:  *
yading@10:  * Uninit lcl encoder
yading@10:  *
yading@10:  */
yading@10: static av_cold int encode_end(AVCodecContext *avctx)
yading@10: {
yading@10:     LclEncContext *c = avctx->priv_data;
yading@10: 
yading@10:     av_freep(&avctx->extradata);
yading@10:     deflateEnd(&c->zstream);
yading@10: 
yading@10:     return 0;
yading@10: }
yading@10: 
yading@10: AVCodec ff_zlib_encoder = {
yading@10:     .name           = "zlib",
yading@10:     .type           = AVMEDIA_TYPE_VIDEO,
yading@10:     .id             = AV_CODEC_ID_ZLIB,
yading@10:     .priv_data_size = sizeof(LclEncContext),
yading@10:     .init           = encode_init,
yading@10:     .encode2        = encode_frame,
yading@10:     .close          = encode_end,
yading@10:     .pix_fmts       = (const enum AVPixelFormat[]) { AV_PIX_FMT_BGR24, AV_PIX_FMT_NONE },
yading@10:     .long_name      = NULL_IF_CONFIG_SMALL("LCL (LossLess Codec Library) ZLIB"),
yading@10: };