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c8707c105f
Just because we try to put multiple units of block_align bytes (the atomic units for APTX and APTX HD) into one packet does not mean that packets with fewer units than the one we wanted are corrupt; only those packets that are not a multiple of block_align are. Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
128 lines
3.9 KiB
C
128 lines
3.9 KiB
C
/*
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* RAW aptX demuxer
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*
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* Copyright (C) 2017 Aurelien Jacobs <aurel@gnuage.org>
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include "config_components.h"
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#include "libavutil/opt.h"
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#include "avformat.h"
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#define APTX_BLOCK_SIZE 4
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#define APTX_PACKET_SIZE (256*APTX_BLOCK_SIZE)
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#define APTX_HD_BLOCK_SIZE 6
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#define APTX_HD_PACKET_SIZE (256*APTX_HD_BLOCK_SIZE)
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typedef struct AptXDemuxerContext {
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AVClass *class;
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int sample_rate;
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} AptXDemuxerContext;
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static AVStream *aptx_read_header_common(AVFormatContext *s)
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{
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AptXDemuxerContext *s1 = s->priv_data;
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AVStream *st = avformat_new_stream(s, NULL);
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if (!st)
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return NULL;
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st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
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st->codecpar->format = AV_SAMPLE_FMT_S32P;
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st->codecpar->ch_layout.nb_channels = 2;
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st->codecpar->sample_rate = s1->sample_rate;
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st->start_time = 0;
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return st;
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}
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static int aptx_read_header(AVFormatContext *s)
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{
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AVStream *st = aptx_read_header_common(s);
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if (!st)
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return AVERROR(ENOMEM);
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st->codecpar->codec_id = AV_CODEC_ID_APTX;
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st->codecpar->bits_per_coded_sample = 4;
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st->codecpar->block_align = APTX_BLOCK_SIZE;
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return 0;
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}
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static int aptx_hd_read_header(AVFormatContext *s)
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{
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AVStream *st = aptx_read_header_common(s);
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if (!st)
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return AVERROR(ENOMEM);
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st->codecpar->codec_id = AV_CODEC_ID_APTX_HD;
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st->codecpar->bits_per_coded_sample = 6;
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st->codecpar->block_align = APTX_HD_BLOCK_SIZE;
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return 0;
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}
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static int aptx_read_packet(AVFormatContext *s, AVPacket *pkt)
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{
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int ret = av_get_packet(s->pb, pkt, APTX_PACKET_SIZE);
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if (ret >= 0 && !(ret % APTX_BLOCK_SIZE))
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pkt->flags &= ~AV_PKT_FLAG_CORRUPT;
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return ret >= 0 ? 0 : ret;
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}
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static int aptx_hd_read_packet(AVFormatContext *s, AVPacket *pkt)
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{
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int ret = av_get_packet(s->pb, pkt, APTX_HD_PACKET_SIZE);
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if (ret >= 0 && !(ret % APTX_HD_BLOCK_SIZE))
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pkt->flags &= ~AV_PKT_FLAG_CORRUPT;
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return ret >= 0 ? 0 : ret;
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}
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static const AVOption aptx_options[] = {
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{ "sample_rate", "", offsetof(AptXDemuxerContext, sample_rate), AV_OPT_TYPE_INT, {.i64 = 48000}, 0, INT_MAX, AV_OPT_FLAG_DECODING_PARAM },
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{ NULL },
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};
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static const AVClass aptx_demuxer_class = {
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.class_name = "aptx (hd) demuxer",
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.item_name = av_default_item_name,
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.option = aptx_options,
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.version = LIBAVUTIL_VERSION_INT,
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};
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#if CONFIG_APTX_DEMUXER
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const AVInputFormat ff_aptx_demuxer = {
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.name = "aptx",
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.long_name = NULL_IF_CONFIG_SMALL("raw aptX"),
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.extensions = "aptx",
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.priv_data_size = sizeof(AptXDemuxerContext),
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.read_header = aptx_read_header,
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.read_packet = aptx_read_packet,
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.flags = AVFMT_GENERIC_INDEX,
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.priv_class = &aptx_demuxer_class,
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};
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#endif
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#if CONFIG_APTX_HD_DEMUXER
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const AVInputFormat ff_aptx_hd_demuxer = {
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.name = "aptx_hd",
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.long_name = NULL_IF_CONFIG_SMALL("raw aptX HD"),
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.extensions = "aptxhd",
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.priv_data_size = sizeof(AptXDemuxerContext),
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.read_header = aptx_hd_read_header,
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.read_packet = aptx_hd_read_packet,
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.flags = AVFMT_GENERIC_INDEX,
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.priv_class = &aptx_demuxer_class,
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};
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#endif
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