/*
  * SDR2 demuxer
  * Copyright (c) 2014 Paul B Mahol
  *
  * 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 "libavutil/intreadwrite.h"
 #include "avformat.h"
 #include "internal.h"
 
 static int sdr2_probe(AVProbeData *p)
 {
     if (AV_RL32(p->buf) != MKTAG('S', 'R', 'A', 1))
         return 0;
 
     return AVPROBE_SCORE_EXTENSION;
 }
 
 #define FIRST 0xA8
 
 static int sdr2_read_header(AVFormatContext *s)
 {
     AVStream *st, *ast;
 
     ast = avformat_new_stream(s, 0);
     if (!ast)
         return AVERROR(ENOMEM);
 
     st = avformat_new_stream(s, 0);
     if (!st)
         return AVERROR(ENOMEM);
 
     avio_skip(s->pb, 20);
     avpriv_set_pts_info(st, 64, 1, avio_rl32(s->pb));
     st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
     st->codec->width      = avio_rl32(s->pb);
     st->codec->height     = avio_rl32(s->pb);
     st->codec->codec_id   = AV_CODEC_ID_H264;

     st->need_parsing      = AVSTREAM_PARSE_FULL;

 
     ast->codec->codec_type  = AVMEDIA_TYPE_AUDIO;
     ast->codec->channels    = 1;
     ast->codec->sample_rate = 8000;
     ast->codec->codec_id    = AV_CODEC_ID_PCM_S16LE;
     avpriv_set_pts_info(ast, 64, 1, 8000);
 
     avio_seek(s->pb, FIRST, SEEK_SET);
 
     return 0;
 }
 
 static const uint8_t header[24] = {
     0x00, 0x00, 0x00, 0x01, 0x67, 0x42, 0x00, 0x1e,
     0xa6, 0x80, 0xb0, 0x7e, 0x40, 0x00, 0x00, 0x00,
     0x01, 0x68, 0xce, 0x38, 0x80, 0x00, 0x00, 0x00
 };
 
 static int sdr2_read_packet(AVFormatContext *s, AVPacket *pkt)
 {
     int64_t pos;
     unsigned next;
     int flags, ret = 0, is_video;
 
     pos = avio_tell(s->pb);
 
     flags = avio_rl32(s->pb);
     avio_skip(s->pb, 4);
 
     next = avio_rl32(s->pb);
     if (next <= 52)
         return AVERROR_INVALIDDATA;
 
     avio_skip(s->pb, 6);
     is_video = avio_rl32(s->pb);
     avio_skip(s->pb, 30);
 
     if (pos == FIRST) {
         if (av_new_packet(pkt, next - 52 + 24) < 0)
             return AVERROR(ENOMEM);
         memcpy(pkt->data, header, 24);
         ret = avio_read(s->pb, pkt->data + 24, next - 52);
         if (ret < 0) {
             av_free_packet(pkt);
             return ret;
         }
         av_shrink_packet(pkt, ret + 24);
     } else {
         ret = av_get_packet(s->pb, pkt, next - 52);
     }
     pkt->stream_index = !!is_video;
     pkt->pos = pos;
     if (flags & (1 << 12))
         pkt->flags |= AV_PKT_FLAG_KEY;
 
     return ret;
 }
 
 AVInputFormat ff_sdr2_demuxer = {
     .name        = "sdr2",
     .long_name   = NULL_IF_CONFIG_SMALL("SDR2"),
     .read_probe  = sdr2_probe,
     .read_header = sdr2_read_header,
     .read_packet = sdr2_read_packet,
     .extensions  = "sdr2",
     .flags       = AVFMT_GENERIC_INDEX,
 };