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/*
* RAW aptX demuxer
*
* Copyright (C) 2017 Aurelien Jacobs <aurel@gnuage.org>
*
* 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 "config_components.h"
#include "libavutil/opt.h"
#include "avformat.h"
#define APTX_BLOCK_SIZE 4
#define APTX_PACKET_SIZE (256*APTX_BLOCK_SIZE)
#define APTX_HD_BLOCK_SIZE 6
#define APTX_HD_PACKET_SIZE (256*APTX_HD_BLOCK_SIZE)
typedef struct AptXDemuxerContext {
AVClass *class;
int sample_rate;
} AptXDemuxerContext;
static AVStream *aptx_read_header_common(AVFormatContext *s)
{
AptXDemuxerContext *s1 = s->priv_data;
AVStream *st = avformat_new_stream(s, NULL);
if (!st)
return NULL;
st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
st->codecpar->format = AV_SAMPLE_FMT_S32P;
st->codecpar->ch_layout.nb_channels = 2;
st->codecpar->sample_rate = s1->sample_rate;
st->start_time = 0;
return st;
}
static int aptx_read_header(AVFormatContext *s)
{
AVStream *st = aptx_read_header_common(s);
if (!st)
return AVERROR(ENOMEM);
st->codecpar->codec_id = AV_CODEC_ID_APTX;
st->codecpar->bits_per_coded_sample = 4;
st->codecpar->block_align = APTX_BLOCK_SIZE;
return 0;
}
static int aptx_hd_read_header(AVFormatContext *s)
{
AVStream *st = aptx_read_header_common(s);
if (!st)
return AVERROR(ENOMEM);
st->codecpar->codec_id = AV_CODEC_ID_APTX_HD;
st->codecpar->bits_per_coded_sample = 6;
st->codecpar->block_align = APTX_HD_BLOCK_SIZE;
return 0;
}
static int aptx_read_packet(AVFormatContext *s, AVPacket *pkt)
{
int ret = av_get_packet(s->pb, pkt, APTX_PACKET_SIZE);
if (ret >= 0 && !(ret % APTX_BLOCK_SIZE))
pkt->flags &= ~AV_PKT_FLAG_CORRUPT;
return ret >= 0 ? 0 : ret;
}
static int aptx_hd_read_packet(AVFormatContext *s, AVPacket *pkt)
{
int ret = av_get_packet(s->pb, pkt, APTX_HD_PACKET_SIZE);
if (ret >= 0 && !(ret % APTX_HD_BLOCK_SIZE))
pkt->flags &= ~AV_PKT_FLAG_CORRUPT;
return ret >= 0 ? 0 : ret;
}
static const AVOption aptx_options[] = {
{ "sample_rate", "", offsetof(AptXDemuxerContext, sample_rate), AV_OPT_TYPE_INT, {.i64 = 48000}, 0, INT_MAX, AV_OPT_FLAG_DECODING_PARAM },
{ NULL },
};
static const AVClass aptx_demuxer_class = {
.class_name = "aptx (hd) demuxer",
.item_name = av_default_item_name,
.option = aptx_options,
.version = LIBAVUTIL_VERSION_INT,
};
#if CONFIG_APTX_DEMUXER
const AVInputFormat ff_aptx_demuxer = {
.name = "aptx",
.long_name = NULL_IF_CONFIG_SMALL("raw aptX"),
.extensions = "aptx",
.priv_data_size = sizeof(AptXDemuxerContext),
.read_header = aptx_read_header,
.read_packet = aptx_read_packet,
.flags = AVFMT_GENERIC_INDEX,
.priv_class = &aptx_demuxer_class,
};
#endif
#if CONFIG_APTX_HD_DEMUXER
const AVInputFormat ff_aptx_hd_demuxer = {
.name = "aptx_hd",
.long_name = NULL_IF_CONFIG_SMALL("raw aptX HD"),
.extensions = "aptxhd",
.priv_data_size = sizeof(AptXDemuxerContext),
.read_header = aptx_hd_read_header,
.read_packet = aptx_hd_read_packet,
.flags = AVFMT_GENERIC_INDEX,
.priv_class = &aptx_demuxer_class,
};
#endif
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