/*
  * Micrsoft RLE Video Decoder
  * Copyright (C) 2003 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 libavcodec/msrle.c

  * MS RLE Video Decoder by Mike Melanson (melanson@pcisys.net)
  * For more information about the MS RLE format, visit:
  *   http://www.pcisys.net/~melanson/codecs/
  *
  * The MS RLE decoder outputs PAL8 colorspace data.
  *
  * Note that this decoder expects the palette colors from the end of the

  * BITMAPINFO header passed through palctrl.

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

 #include "msrledec.h"

 
 typedef struct MsrleContext {
     AVCodecContext *avctx;
     AVFrame frame;
 

     const unsigned char *buf;

     int size;
 
 } MsrleContext;
 

 static av_cold int msrle_decode_init(AVCodecContext *avctx)

 {

     MsrleContext *s = avctx->priv_data;

 
     s->avctx = avctx;
 
     avctx->pix_fmt = PIX_FMT_PAL8;

     s->frame.data[0] = NULL;

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

                               const uint8_t *buf, int buf_size)

 {

     MsrleContext *s = avctx->priv_data;

 
     s->buf = buf;
     s->size = buf_size;
 

     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;
     }
 

     /* make the palette available */
     memcpy(s->frame.data[1], s->avctx->palctrl->palette, AVPALETTE_SIZE);
     if (s->avctx->palctrl->palette_changed) {
         s->frame.palette_has_changed = 1;
         s->avctx->palctrl->palette_changed = 0;

     }

     ff_msrle_decode(avctx, (AVPicture*)&s->frame, avctx->bits_per_coded_sample, buf, buf_size);

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

 static av_cold int msrle_decode_end(AVCodecContext *avctx)

 {

     MsrleContext *s = avctx->priv_data;

 
     /* release the last frame */

     if (s->frame.data[0])
         avctx->release_buffer(avctx, &s->frame);

 
     return 0;
 }
 
 AVCodec msrle_decoder = {
     "msrle",
     CODEC_TYPE_VIDEO,
     CODEC_ID_MSRLE,
     sizeof(MsrleContext),
     msrle_decode_init,
     NULL,
     msrle_decode_end,
     msrle_decode_frame,

     CODEC_CAP_DR1,

     .long_name= NULL_IF_CONFIG_SMALL("Microsoft RLE"),

 };