/* * 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"#include "demux.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_DEMUXERconst FFInputFormat ff_aptx_demuxer = {    .p.name         = "aptx",    .p.long_name    = NULL_IF_CONFIG_SMALL("raw aptX"),    .p.extensions   = "aptx",    .p.flags        = AVFMT_GENERIC_INDEX,    .p.priv_class   = &aptx_demuxer_class,    .priv_data_size = sizeof(AptXDemuxerContext),    .read_header    = aptx_read_header,    .read_packet    = aptx_read_packet,};#endif #if CONFIG_APTX_HD_DEMUXERconst FFInputFormat ff_aptx_hd_demuxer = {    .p.name         = "aptx_hd",    .p.long_name    = NULL_IF_CONFIG_SMALL("raw aptX HD"),    .p.extensions   = "aptxhd",    .p.flags        = AVFMT_GENERIC_INDEX,    .p.priv_class   = &aptx_demuxer_class,    .priv_data_size = sizeof(AptXDemuxerContext),    .read_header    = aptx_hd_read_header,    .read_packet    = aptx_hd_read_packet,};#endif