/*
  * 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 (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 <stdio.h>
 #include <stdlib.h>
 

 #include "libavutil/avassert.h"

 #include "avcodec.h"

 #include "internal.h"

 #include "lcl.h"

 #include "libavutil/internal.h"
 #include "libavutil/mem.h"

 
 #include <zlib.h>
 
 /*
  * Decoder context
  */
 typedef struct LclEncContext {
 

     AVCodecContext *avctx;

 
     // Image type
     int imgtype;
     // Compression type
     int compression;
     // Flags
     int flags;
     z_stream zstream;
 } LclEncContext;
 
 /*
  *
  * Encode a frame
  *
  */

 static int encode_frame(AVCodecContext *avctx, AVPacket *pkt,

                         const AVFrame *p, int *got_packet)

 {

     LclEncContext *c = avctx->priv_data;

     int i, ret;

     int zret; // Zlib return code

     int max_size = deflateBound(&c->zstream, avctx->width * avctx->height * 3);
 

     if ((ret = ff_alloc_packet2(avctx, pkt, max_size)) < 0)

         return ret;

     if(avctx->pix_fmt != AV_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  = pkt->data;
     c->zstream.avail_out = pkt->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;
     }
 

     pkt->size   = c->zstream.total_out;
     pkt->flags |= AV_PKT_FLAG_KEY;
     *got_packet = 1;
 
     return 0;

 }
 
 /*
  *
  * Init lcl encoder
  *
  */

 static av_cold int encode_init(AVCodecContext *avctx)

 {
     LclEncContext *c = avctx->priv_data;
     int zret; // Zlib return code
 
     c->avctx= avctx;
 

     av_assert0(avctx->width && avctx->height);

     avctx->extradata = av_mallocz(8 + FF_INPUT_BUFFER_PADDING_SIZE);
     if (!avctx->extradata)
         return AVERROR(ENOMEM);

     avctx->coded_frame = av_frame_alloc();
     if (!avctx->coded_frame)
         return AVERROR(ENOMEM);
 
     avctx->coded_frame->pict_type = AV_PICTURE_TYPE_I;
     avctx->coded_frame->key_frame = 1;
 

     c->compression = avctx->compression_level == FF_COMPRESSION_DEFAULT ?
                             COMP_ZLIB_NORMAL :
                             av_clip(avctx->compression_level, 0, 9);

     c->flags = 0;

     c->imgtype = IMGTYPE_RGB24;
     avctx->bits_per_coded_sample= 24;

     avctx->extradata[0]= 4;
     avctx->extradata[1]= 0;
     avctx->extradata[2]= 0;
     avctx->extradata[3]= 0;
     avctx->extradata[4]= c->imgtype;
     avctx->extradata[5]= c->compression;
     avctx->extradata[6]= c->flags;
     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;
     }
 
     return 0;
 }
 
 /*
  *
  * Uninit lcl encoder
  *
  */

 static av_cold int encode_end(AVCodecContext *avctx)

 {
     LclEncContext *c = avctx->priv_data;
 
     av_freep(&avctx->extradata);

     deflateEnd(&c->zstream);

     av_frame_free(&avctx->coded_frame);
 

     return 0;
 }
 

 AVCodec ff_zlib_encoder = {

     .name           = "zlib",

     .long_name      = NULL_IF_CONFIG_SMALL("LCL (LossLess Codec Library) ZLIB"),

     .type           = AVMEDIA_TYPE_VIDEO,

     .id             = AV_CODEC_ID_ZLIB,

     .priv_data_size = sizeof(LclEncContext),
     .init           = encode_init,

     .encode2        = encode_frame,

     .close          = encode_end,

     .pix_fmts       = (const enum AVPixelFormat[]) { AV_PIX_FMT_BGR24, AV_PIX_FMT_NONE },

 };