/*
  * Alias PIX image demuxer
  * Copyright (c) 2014 Michael Niedermayer
  *
  * 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
  */
 
 #include "img2.h"

 #include "libavcodec/bytestream.h"

 static int alias_pix_read_probe(AVProbeData *p)

 {

     const uint8_t *b = p->buf;
     const uint8_t *end = b + p->buf_size;
     int width  = bytestream_get_be16(&b);
     int height = bytestream_get_be16(&b);

     av_unused int ox = bytestream_get_be16(&b);
     av_unused int oy = bytestream_get_be16(&b);

     int bpp    = bytestream_get_be16(&b);
     int x, y;

     if (!width || !height)

         return 0;
 
     if (bpp != 24 && bpp != 8)
         return 0;
 

     for (y=0; y<2 && y<height; y++) {
         for (x=0; x<width; ) {
             int count = *b++;
             if (count == 0 || x + count > width)
                 return 0;
             if (b > end)
                 return AVPROBE_SCORE_MAX / 8;
             b += bpp / 8;
             x += count;
         }
     }
 

     return AVPROBE_SCORE_EXTENSION + 1;
 }
 

 static const AVClass image2_alias_pix_class = {
     .class_name = "alias_pix demuxer",
     .item_name  = av_default_item_name,
     .option     = ff_img_options,
     .version    = LIBAVUTIL_VERSION_INT,
 };
 

 AVInputFormat ff_image2_alias_pix_demuxer = {
     .name           = "alias_pix",
     .long_name      = NULL_IF_CONFIG_SMALL("Alias/Wavefront PIX image"),
     .priv_data_size = sizeof(VideoDemuxData),

     .read_probe     = alias_pix_read_probe,

     .read_header    = ff_img_read_header,
     .read_packet    = ff_img_read_packet,
     .raw_codec_id   = AV_CODEC_ID_ALIAS_PIX,

     .priv_class     = &image2_alias_pix_class,

 };