/*

  * Autodesk RLE Decoder

  * Copyright (C) 2005 the ffmpeg project
  *

  * 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

  * Autodesk RLE Video Decoder by Konstantin Shishkov

  */
 
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
 
 #include "avcodec.h"
 #include "dsputil.h"

 #include "msrledec.h"

 
 typedef struct AascContext {
     AVCodecContext *avctx;
     AVFrame frame;
 } AascContext;
 
 #define FETCH_NEXT_STREAM_BYTE() \
     if (stream_ptr >= buf_size) \
     { \
       av_log(s->avctx, AV_LOG_ERROR, " AASC: stream ptr just went out of bounds (fetch)\n"); \
       break; \
     } \
     stream_byte = buf[stream_ptr++];
 

 static av_cold int aasc_decode_init(AVCodecContext *avctx)

 {

     AascContext *s = avctx->priv_data;

 
     s->avctx = avctx;
     avctx->pix_fmt = PIX_FMT_BGR24;

     avcodec_get_frame_defaults(&s->frame);

 
     return 0;
 }
 
 static int aasc_decode_frame(AVCodecContext *avctx,
                               void *data, int *data_size,

                               AVPacket *avpkt)

 {

     const uint8_t *buf = avpkt->data;
     int buf_size = avpkt->size;

     AascContext *s = avctx->priv_data;

     int compr, i, stride;

 
     s->frame.reference = 1;
     s->frame.buffer_hints = FF_BUFFER_HINTS_VALID | FF_BUFFER_HINTS_PRESERVE | FF_BUFFER_HINTS_REUSABLE;
     if (avctx->reget_buffer(avctx, &s->frame)) {
         av_log(avctx, AV_LOG_ERROR, "reget_buffer() failed\n");
         return -1;
     }
 

     compr = AV_RL32(buf);
     buf += 4;
     buf_size -= 4;
     switch(compr){
     case 0:
         stride = (avctx->width * 3 + 3) & ~3;
         for(i = avctx->height - 1; i >= 0; i--){
             memcpy(s->frame.data[0] + i*s->frame.linesize[0], buf, avctx->width*3);
             buf += stride;
         }
         break;
     case 1:

         ff_msrle_decode(avctx, (AVPicture*)&s->frame, 8, buf - 4, buf_size + 4);

         break;
     default:
         av_log(avctx, AV_LOG_ERROR, "Unknown compression type %d\n", compr);
         return -1;
     }

 
     *data_size = sizeof(AVFrame);
     *(AVFrame*)data = s->frame;
 
     /* report that the buffer was completely consumed */
     return buf_size;
 }
 

 static av_cold int aasc_decode_end(AVCodecContext *avctx)

 {

     AascContext *s = avctx->priv_data;

 
     /* release the last frame */
     if (s->frame.data[0])
         avctx->release_buffer(avctx, &s->frame);
 
     return 0;
 }
 

 AVCodec ff_aasc_decoder = {

     "aasc",

     AVMEDIA_TYPE_VIDEO,

     CODEC_ID_AASC,
     sizeof(AascContext),
     aasc_decode_init,
     NULL,
     aasc_decode_end,
     aasc_decode_frame,
     CODEC_CAP_DR1,

     .long_name = NULL_IF_CONFIG_SMALL("Autodesk RLE"),

 };