1/* 2 * RAW aptX demuxer 3 * 4 * Copyright (C) 2017 Aurelien Jacobs <aurel@gnuage.org> 5 * 6 * This file is part of FFmpeg. 7 * 8 * FFmpeg is free software; you can redistribute it and/or 9 * modify it under the terms of the GNU Lesser General Public 10 * License as published by the Free Software Foundation; either 11 * version 2.1 of the License, or (at your option) any later version. 12 * 13 * FFmpeg is distributed in the hope that it will be useful, 14 * but WITHOUT ANY WARRANTY; without even the implied warranty of 15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 16 * Lesser General Public License for more details. 17 * 18 * You should have received a copy of the GNU Lesser General Public 19 * License along with FFmpeg; if not, write to the Free Software 20 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA 21 */ 22 23#include "config_components.h" 24 25#include "libavutil/opt.h" 26#include "avformat.h" 27 28#define APTX_BLOCK_SIZE 4 29#define APTX_PACKET_SIZE (256*APTX_BLOCK_SIZE) 30 31#define APTX_HD_BLOCK_SIZE 6 32#define APTX_HD_PACKET_SIZE (256*APTX_HD_BLOCK_SIZE) 33 34typedef struct AptXDemuxerContext { 35 AVClass *class; 36 int sample_rate; 37} AptXDemuxerContext; 38 39static AVStream *aptx_read_header_common(AVFormatContext *s) 40{ 41 AptXDemuxerContext *s1 = s->priv_data; 42 AVStream *st = avformat_new_stream(s, NULL); 43 if (!st) 44 return NULL; 45 st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO; 46 st->codecpar->format = AV_SAMPLE_FMT_S32P; 47 st->codecpar->ch_layout.nb_channels = 2; 48 st->codecpar->sample_rate = s1->sample_rate; 49 st->start_time = 0; 50 return st; 51} 52 53static int aptx_read_header(AVFormatContext *s) 54{ 55 AVStream *st = aptx_read_header_common(s); 56 if (!st) 57 return AVERROR(ENOMEM); 58 st->codecpar->codec_id = AV_CODEC_ID_APTX; 59 st->codecpar->bits_per_coded_sample = 4; 60 st->codecpar->block_align = APTX_BLOCK_SIZE; 61 st->codecpar->frame_size = APTX_PACKET_SIZE; 62 return 0; 63} 64 65static int aptx_hd_read_header(AVFormatContext *s) 66{ 67 AVStream *st = aptx_read_header_common(s); 68 if (!st) 69 return AVERROR(ENOMEM); 70 st->codecpar->codec_id = AV_CODEC_ID_APTX_HD; 71 st->codecpar->bits_per_coded_sample = 6; 72 st->codecpar->block_align = APTX_HD_BLOCK_SIZE; 73 st->codecpar->frame_size = APTX_HD_PACKET_SIZE; 74 return 0; 75} 76 77static int aptx_read_packet(AVFormatContext *s, AVPacket *pkt) 78{ 79 return av_get_packet(s->pb, pkt, APTX_PACKET_SIZE); 80} 81 82static int aptx_hd_read_packet(AVFormatContext *s, AVPacket *pkt) 83{ 84 return av_get_packet(s->pb, pkt, APTX_HD_PACKET_SIZE); 85} 86 87static const AVOption aptx_options[] = { 88 { "sample_rate", "", offsetof(AptXDemuxerContext, sample_rate), AV_OPT_TYPE_INT, {.i64 = 48000}, 0, INT_MAX, AV_OPT_FLAG_DECODING_PARAM }, 89 { NULL }, 90}; 91 92static const AVClass aptx_demuxer_class = { 93 .class_name = "aptx (hd) demuxer", 94 .item_name = av_default_item_name, 95 .option = aptx_options, 96 .version = LIBAVUTIL_VERSION_INT, 97}; 98 99#if CONFIG_APTX_DEMUXER 100const AVInputFormat ff_aptx_demuxer = { 101 .name = "aptx", 102 .long_name = NULL_IF_CONFIG_SMALL("raw aptX"), 103 .extensions = "aptx", 104 .priv_data_size = sizeof(AptXDemuxerContext), 105 .read_header = aptx_read_header, 106 .read_packet = aptx_read_packet, 107 .flags = AVFMT_GENERIC_INDEX, 108 .priv_class = &aptx_demuxer_class, 109}; 110#endif 111 112#if CONFIG_APTX_HD_DEMUXER 113const AVInputFormat ff_aptx_hd_demuxer = { 114 .name = "aptx_hd", 115 .long_name = NULL_IF_CONFIG_SMALL("raw aptX HD"), 116 .extensions = "aptxhd", 117 .priv_data_size = sizeof(AptXDemuxerContext), 118 .read_header = aptx_hd_read_header, 119 .read_packet = aptx_hd_read_packet, 120 .flags = AVFMT_GENERIC_INDEX, 121 .priv_class = &aptx_demuxer_class, 122}; 123#endif 124