FFmpeg
aptxdec.c
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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;
36 
38 {
41  if (!st)
42  return NULL;
45  st->codecpar->channels = 2;
46  st->codecpar->sample_rate = s1->sample_rate;
47  st->start_time = 0;
48  return st;
49 }
50 
52 {
54  if (!st)
55  return AVERROR(ENOMEM);
60  return 0;
61 }
62 
64 {
66  if (!st)
67  return AVERROR(ENOMEM);
72  return 0;
73 }
74 
76 {
77  return av_get_packet(s->pb, pkt, APTX_PACKET_SIZE);
78 }
79 
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 
99  .name = "aptx",
100  .long_name = NULL_IF_CONFIG_SMALL("raw aptX"),
101  .extensions = "aptx",
102  .priv_data_size = sizeof(AptXDemuxerContext),
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 
119  .name = "aptx_hd",
120  .long_name = NULL_IF_CONFIG_SMALL("raw aptX HD"),
121  .extensions = "aptxhd",
122  .priv_data_size = sizeof(AptXDemuxerContext),
126  .priv_class = &aptx_hd_demuxer_class,
127 };
128 #endif
#define NULL
Definition: coverity.c:32
AVOption.
Definition: opt.h:246
#define LIBAVUTIL_VERSION_INT
Definition: version.h:85
enum AVCodecID codec_id
Specific type of the encoded data (the codec used).
Definition: avcodec.h:3970
const char * av_default_item_name(void *ptr)
Return the context name.
Definition: log.c:191
static const AVOption aptx_options[]
Definition: aptxdec.c:85
#define APTX_HD_BLOCK_SIZE
Definition: aptxdec.c:29
static AVStream * aptx_read_header_common(AVFormatContext *s)
Definition: aptxdec.c:37
static AVPacket pkt
int frame_size
Audio only.
Definition: avcodec.h:4091
#define APTX_HD_PACKET_SIZE
Definition: aptxdec.c:30
Format I/O context.
Definition: avformat.h:1358
const char * class_name
The name of the class; usually it is the same name as the context structure type to which the AVClass...
Definition: log.h:72
#define APTX_BLOCK_SIZE
Definition: aptxdec.c:26
AVStream * avformat_new_stream(AVFormatContext *s, const AVCodec *c)
Add a new stream to a media file.
Definition: utils.c:4502
int av_get_packet(AVIOContext *s, AVPacket *pkt, int size)
Allocate and read the payload of a packet and initialize its fields with default values.
Definition: utils.c:310
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition: internal.h:186
enum AVMediaType codec_type
General type of the encoded data.
Definition: avcodec.h:3966
#define APTX_PACKET_SIZE
Definition: aptxdec.c:27
int block_align
Audio only.
Definition: avcodec.h:4087
signed 32 bits, planar
Definition: samplefmt.h:68
static int aptx_read_packet(AVFormatContext *s, AVPacket *pkt)
Definition: aptxdec.c:75
static int aptx_hd_read_packet(AVFormatContext *s, AVPacket *pkt)
Definition: aptxdec.c:80
AVInputFormat ff_aptx_demuxer
#define s(width, name)
Definition: cbs_vp9.c:257
static int read_header(FFV1Context *f)
Definition: ffv1dec.c:530
Stream structure.
Definition: avformat.h:881
static int read_packet(void *opaque, uint8_t *buf, int buf_size)
Definition: avio_reading.c:42
AVIOContext * pb
I/O context.
Definition: avformat.h:1400
Describe the class of an AVClass context structure.
Definition: log.h:67
#define AVFMT_GENERIC_INDEX
Use generic index building code.
Definition: avformat.h:468
AVInputFormat ff_aptx_hd_demuxer
#define AV_OPT_FLAG_DECODING_PARAM
a generic parameter which can be set by the user for demuxing or decoding
Definition: opt.h:277
#define s1
Definition: regdef.h:38
static int aptx_read_header(AVFormatContext *s)
Definition: aptxdec.c:51
#define flags(name, subs,...)
Definition: cbs_av1.c:561
int sample_rate
Audio only.
Definition: avcodec.h:4080
Main libavformat public API header.
int64_t start_time
Decoding: pts of the first frame of the stream in presentation order, in stream time base...
Definition: avformat.h:920
static int aptx_hd_read_header(AVFormatContext *s)
Definition: aptxdec.c:63
void * priv_data
Format private data.
Definition: avformat.h:1386
int bits_per_coded_sample
The number of bits per sample in the codedwords.
Definition: avcodec.h:4012
int channels
Audio only.
Definition: avcodec.h:4076
const char * name
A comma separated list of short names for the format.
Definition: avformat.h:654
AVCodecParameters * codecpar
Codec parameters associated with this stream.
Definition: avformat.h:1028
Filter the word “frame” indicates either a video frame or a group of audio as stored in an AVFrame structure Format for each input and each output the list of supported formats For video that means pixel format For audio that means channel sample they are references to shared objects When the negotiation mechanism computes the intersection of the formats supported at each end of a all references to both lists are replaced with a reference to the intersection And when a single format is eventually chosen for a link amongst the remaining all references to the list are updated That means that if a filter requires that its input and output have the same format amongst a supported all it has to do is use a reference to the same list of formats query_formats can leave some formats unset and return AVERROR(EAGAIN) to cause the negotiation mechanism toagain later.That can be used by filters with complex requirements to use the format negotiated on one link to set the formats supported on another.Frame references ownership and permissions
This structure stores compressed data.
Definition: avcodec.h:1459