/*
  * AFC demuxer
  * Copyright (c) 2012 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/channel_layout.h"
 #include "avformat.h"
 #include "internal.h"
 
 typedef struct AFCDemuxContext {
     int64_t    data_end;
 } AFCDemuxContext;
 
 static int afc_read_header(AVFormatContext *s)
 {
     AFCDemuxContext *c = s->priv_data;
     AVStream *st;
 
     st = avformat_new_stream(s, NULL);
     if (!st)
         return AVERROR(ENOMEM);
     st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
     st->codec->codec_id   = AV_CODEC_ID_ADPCM_AFC;
     st->codec->channels   = 2;
     st->codec->channel_layout = AV_CH_LAYOUT_STEREO;
     st->codec->extradata_size = 1;
 
     st->codec->extradata = av_mallocz(1 + FF_INPUT_BUFFER_PADDING_SIZE);
     if (!st->codec->extradata)
         return AVERROR(ENOMEM);
     st->codec->extradata[0] = 8 * st->codec->channels;
 
     c->data_end = avio_rb32(s->pb) + 32LL;
     st->duration = avio_rb32(s->pb);
     st->codec->sample_rate = avio_rb16(s->pb);
     avio_skip(s->pb, 22);
     avpriv_set_pts_info(st, 64, 1, st->codec->sample_rate);
 
     return 0;
 }
 
 static int afc_read_packet(AVFormatContext *s, AVPacket *pkt)
 {
     AFCDemuxContext *c = s->priv_data;
     int64_t size;
     int ret;
 
     size = FFMIN(c->data_end - avio_tell(s->pb), 18 * 128);
     if (size <= 0)
         return AVERROR_EOF;
 
     ret = av_get_packet(s->pb, pkt, size);
     pkt->stream_index = 0;
     return ret;
 }
 
 AVInputFormat ff_afc_demuxer = {
     .name           = "afc",
     .long_name      = NULL_IF_CONFIG_SMALL("AFC"),
     .priv_data_size = sizeof(AFCDemuxContext),
     .read_header    = afc_read_header,
     .read_packet    = afc_read_packet,
     .extensions     = "afc",
     .flags          = AVFMT_NOBINSEARCH | AVFMT_NOGENSEARCH | AVFMT_NO_BYTE_SEEK,
 };