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
34 typedef struct AptXDemuxerContext {
35 AVClass *class;
36 int sample_rate;
37 } AptXDemuxerContext;
38
aptx_read_header_common(AVFormatContext * s)39 static 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
aptx_read_header(AVFormatContext * s)53 static 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
aptx_hd_read_header(AVFormatContext * s)65 static 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
aptx_read_packet(AVFormatContext * s,AVPacket * pkt)77 static int aptx_read_packet(AVFormatContext *s, AVPacket *pkt)
78 {
79 return av_get_packet(s->pb, pkt, APTX_PACKET_SIZE);
80 }
81
aptx_hd_read_packet(AVFormatContext * s,AVPacket * pkt)82 static int aptx_hd_read_packet(AVFormatContext *s, AVPacket *pkt)
83 {
84 return av_get_packet(s->pb, pkt, APTX_HD_PACKET_SIZE);
85 }
86
87 static 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
92 static 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
100 const 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
113 const 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