/*
  * Copyright (c) 2011 Justin Ruggles
  *
  * This file is part of Libav.
  *
  * Libav 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.
  *
  * Libav 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 Libav; if not, write to the Free Software
  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 /**
  * @file
  * CRI ADX demuxer
  */
 
 #include "libavutil/intreadwrite.h"
 #include "libavcodec/adx.h"
 #include "avformat.h"

 #include "internal.h"

 
 #define BLOCK_SIZE    18
 #define BLOCK_SAMPLES 32
 
 typedef struct ADXDemuxerContext {
     int header_size;
 } ADXDemuxerContext;
 
 static int adx_read_packet(AVFormatContext *s, AVPacket *pkt)
 {
     ADXDemuxerContext *c = s->priv_data;
     AVCodecContext *avctx = s->streams[0]->codec;
     int ret, size;
 
     size = BLOCK_SIZE * avctx->channels;
 
     pkt->pos = avio_tell(s->pb);
     pkt->stream_index = 0;
 
     ret = av_get_packet(s->pb, pkt, size);
     if (ret != size) {
         av_free_packet(pkt);
         return ret < 0 ? ret : AVERROR(EIO);
     }
     if (AV_RB16(pkt->data) & 0x8000) {
         av_free_packet(pkt);
         return AVERROR_EOF;
     }
     pkt->size     = size;
     pkt->duration = 1;
     pkt->pts      = (pkt->pos - c->header_size) / size;
 
     return 0;
 }
 

 static int adx_read_header(AVFormatContext *s)

 {
     ADXDemuxerContext *c = s->priv_data;
     AVCodecContext *avctx;
     int ret;
 
     AVStream *st = avformat_new_stream(s, NULL);
     if (!st)
         return AVERROR(ENOMEM);
     avctx = s->streams[0]->codec;
 
     if (avio_rb16(s->pb) != 0x8000)
         return AVERROR_INVALIDDATA;
     c->header_size = avio_rb16(s->pb) + 4;
     avio_seek(s->pb, -4, SEEK_CUR);
 
     avctx->extradata = av_mallocz(c->header_size + FF_INPUT_BUFFER_PADDING_SIZE);
     if (!avctx->extradata)
         return AVERROR(ENOMEM);
     if (avio_read(s->pb, avctx->extradata, c->header_size) < c->header_size) {
         av_freep(&avctx->extradata);
         return AVERROR(EIO);
     }
     avctx->extradata_size = c->header_size;
 

     ret = avpriv_adx_decode_header(avctx, avctx->extradata,
                                    avctx->extradata_size, &c->header_size,
                                    NULL);

     if (ret)
         return ret;
 
     st->codec->codec_type  = AVMEDIA_TYPE_AUDIO;

     st->codec->codec_id    = s->iformat->raw_codec_id;

     avpriv_set_pts_info(st, 64, BLOCK_SAMPLES, avctx->sample_rate);

 
     return 0;
 }
 
 AVInputFormat ff_adx_demuxer = {
     .name           = "adx",
     .long_name      = NULL_IF_CONFIG_SMALL("CRI ADX"),
     .priv_data_size = sizeof(ADXDemuxerContext),
     .read_header    = adx_read_header,
     .read_packet    = adx_read_packet,
     .extensions     = "adx",

     .raw_codec_id   = AV_CODEC_ID_ADPCM_ADX,

     .flags          = AVFMT_GENERIC_INDEX,

 };