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 "avformat.h"
24 #include "rawdec.h"
25
26 #define APTX_BLOCK_SIZE 4
27 #define APTX_PACKET_SIZE (256*APTX_BLOCK_SIZE)
28
29 #define APTX_HD_BLOCK_SIZE 6
30 #define APTX_HD_PACKET_SIZE (256*APTX_HD_BLOCK_SIZE)
31
32 typedef struct AptXDemuxerContext {
33 AVClass *class;
34 int sample_rate;
35 } AptXDemuxerContext;
36
aptx_read_header_common(AVFormatContext * s)37 static AVStream *aptx_read_header_common(AVFormatContext *s)
38 {
39 AptXDemuxerContext *s1 = s->priv_data;
40 AVStream *st = avformat_new_stream(s, NULL);
41 if (!st)
42 return NULL;
43 st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
44 st->codecpar->format = AV_SAMPLE_FMT_S32P;
45 st->codecpar->channels = 2;
46 st->codecpar->sample_rate = s1->sample_rate;
47 st->start_time = 0;
48 return st;
49 }
50
aptx_read_header(AVFormatContext * s)51 static int aptx_read_header(AVFormatContext *s)
52 {
53 AVStream *st = aptx_read_header_common(s);
54 if (!st)
55 return AVERROR(ENOMEM);
56 st->codecpar->codec_id = AV_CODEC_ID_APTX;
57 st->codecpar->bits_per_coded_sample = 4;
58 st->codecpar->block_align = APTX_BLOCK_SIZE;
59 st->codecpar->frame_size = APTX_PACKET_SIZE;
60 return 0;
61 }
62
aptx_hd_read_header(AVFormatContext * s)63 static int aptx_hd_read_header(AVFormatContext *s)
64 {
65 AVStream *st = aptx_read_header_common(s);
66 if (!st)
67 return AVERROR(ENOMEM);
68 st->codecpar->codec_id = AV_CODEC_ID_APTX_HD;
69 st->codecpar->bits_per_coded_sample = 6;
70 st->codecpar->block_align = APTX_HD_BLOCK_SIZE;
71 st->codecpar->frame_size = APTX_HD_PACKET_SIZE;
72 return 0;
73 }
74
aptx_read_packet(AVFormatContext * s,AVPacket * pkt)75 static int aptx_read_packet(AVFormatContext *s, AVPacket *pkt)
76 {
77 return av_get_packet(s->pb, pkt, APTX_PACKET_SIZE);
78 }
79
aptx_hd_read_packet(AVFormatContext * s,AVPacket * pkt)80 static int aptx_hd_read_packet(AVFormatContext *s, AVPacket *pkt)
81 {
82 return av_get_packet(s->pb, pkt, APTX_HD_PACKET_SIZE);
83 }
84
85 static const AVOption aptx_options[] = {
86 { "sample_rate", "", offsetof(AptXDemuxerContext, sample_rate), AV_OPT_TYPE_INT, {.i64 = 48000}, 0, INT_MAX, AV_OPT_FLAG_DECODING_PARAM },
87 { NULL },
88 };
89
90 #if CONFIG_APTX_DEMUXER
91 static const AVClass aptx_demuxer_class = {
92 .class_name = "aptx demuxer",
93 .item_name = av_default_item_name,
94 .option = aptx_options,
95 .version = LIBAVUTIL_VERSION_INT,
96 };
97
98 AVInputFormat ff_aptx_demuxer = {
99 .name = "aptx",
100 .long_name = NULL_IF_CONFIG_SMALL("raw aptX"),
101 .extensions = "aptx",
102 .priv_data_size = sizeof(AptXDemuxerContext),
103 .read_header = aptx_read_header,
104 .read_packet = aptx_read_packet,
105 .flags = AVFMT_GENERIC_INDEX,
106 .priv_class = &aptx_demuxer_class,
107 };
108 #endif
109
110 #if CONFIG_APTX_HD_DEMUXER
111 static const AVClass aptx_hd_demuxer_class = {
112 .class_name = "aptx hd demuxer",
113 .item_name = av_default_item_name,
114 .option = aptx_options,
115 .version = LIBAVUTIL_VERSION_INT,
116 };
117
118 AVInputFormat ff_aptx_hd_demuxer = {
119 .name = "aptx_hd",
120 .long_name = NULL_IF_CONFIG_SMALL("raw aptX HD"),
121 .extensions = "aptxhd",
122 .priv_data_size = sizeof(AptXDemuxerContext),
123 .read_header = aptx_hd_read_header,
124 .read_packet = aptx_hd_read_packet,
125 .flags = AVFMT_GENERIC_INDEX,
126 .priv_class = &aptx_hd_demuxer_class,
127 };
128 #endif
129