FFmpeg  4.0
dsfdec.c
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1 /*
2  * DSD Stream File (DSF) demuxer
3  * Copyright (c) 2014 Peter Ross
4  *
5  * This file is part of FFmpeg.
6  *
7  * FFmpeg is free software; you can redistribute it and/or
8  * modify it under the terms of the GNU Lesser General Public
9  * License as published by the Free Software Foundation; either
10  * version 2.1 of the License, or (at your option) any later version.
11  *
12  * FFmpeg is distributed in the hope that it will be useful,
13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15  * Lesser General Public License for more details.
16  *
17  * You should have received a copy of the GNU Lesser General Public
18  * License along with FFmpeg; if not, write to the Free Software
19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20  */
21 
22 #include "libavutil/intreadwrite.h"
23 #include "avformat.h"
24 #include "internal.h"
25 #include "id3v2.h"
26 
27 typedef struct {
28  uint64_t data_end;
29 } DSFContext;
30 
31 static int dsf_probe(AVProbeData *p)
32 {
33  if (p->buf_size < 12 || memcmp(p->buf, "DSD ", 4) || AV_RL64(p->buf + 4) != 28)
34  return 0;
35  return AVPROBE_SCORE_MAX;
36 }
37 
38 static const uint64_t dsf_channel_layout[] = {
39  0,
47 };
48 
49 static void read_id3(AVFormatContext *s, uint64_t id3pos)
50 {
51  ID3v2ExtraMeta *id3v2_extra_meta = NULL;
52  if (avio_seek(s->pb, id3pos, SEEK_SET) < 0)
53  return;
54 
55  ff_id3v2_read(s, ID3v2_DEFAULT_MAGIC, &id3v2_extra_meta, 0);
56  if (id3v2_extra_meta) {
57  ff_id3v2_parse_apic(s, &id3v2_extra_meta);
58  ff_id3v2_parse_chapters(s, &id3v2_extra_meta);
59  }
60  ff_id3v2_free_extra_meta(&id3v2_extra_meta);
61 }
62 
64 {
65  DSFContext *dsf = s->priv_data;
66  AVIOContext *pb = s->pb;
67  AVStream *st;
68  uint64_t id3pos;
69  unsigned int channel_type;
70 
71  avio_skip(pb, 4);
72  if (avio_rl64(pb) != 28)
73  return AVERROR_INVALIDDATA;
74 
75  /* create primary stream before any id3 coverart streams */
76  st = avformat_new_stream(s, NULL);
77  if (!st)
78  return AVERROR(ENOMEM);
79 
80  avio_skip(pb, 8);
81  id3pos = avio_rl64(pb);
82  if (pb->seekable & AVIO_SEEKABLE_NORMAL) {
83  read_id3(s, id3pos);
84  avio_seek(pb, 28, SEEK_SET);
85  }
86 
87  /* fmt chunk */
88 
89  if (avio_rl32(pb) != MKTAG('f', 'm', 't', ' ') || avio_rl64(pb) != 52)
90  return AVERROR_INVALIDDATA;
91 
92  if (avio_rl32(pb) != 1) {
93  avpriv_request_sample(s, "unknown format version");
94  return AVERROR_INVALIDDATA;
95  }
96 
97  if (avio_rl32(pb)) {
98  avpriv_request_sample(s, "unknown format id");
99  return AVERROR_INVALIDDATA;
100  }
101 
102  channel_type = avio_rl32(pb);
103  if (channel_type < FF_ARRAY_ELEMS(dsf_channel_layout))
104  st->codecpar->channel_layout = dsf_channel_layout[channel_type];
105  if (!st->codecpar->channel_layout)
106  avpriv_request_sample(s, "channel type %i", channel_type);
107 
109  st->codecpar->channels = avio_rl32(pb);
110  st->codecpar->sample_rate = avio_rl32(pb) / 8;
111 
112  if (st->codecpar->channels <= 0)
113  return AVERROR_INVALIDDATA;
114 
115  switch(avio_rl32(pb)) {
116  case 1: st->codecpar->codec_id = AV_CODEC_ID_DSD_LSBF_PLANAR; break;
117  case 8: st->codecpar->codec_id = AV_CODEC_ID_DSD_MSBF_PLANAR; break;
118  default:
119  avpriv_request_sample(s, "unknown most significant bit");
120  return AVERROR_INVALIDDATA;
121  }
122 
123  avio_skip(pb, 8);
124  st->codecpar->block_align = avio_rl32(pb);
125  if (st->codecpar->block_align > INT_MAX / st->codecpar->channels) {
126  avpriv_request_sample(s, "block_align overflow");
127  return AVERROR_INVALIDDATA;
128  }
129  st->codecpar->block_align *= st->codecpar->channels;
130  st->codecpar->bit_rate = st->codecpar->channels * st->codecpar->sample_rate * 8LL;
131  avio_skip(pb, 4);
132 
133  /* data chunk */
134 
135  dsf->data_end = avio_tell(pb);
136  if (avio_rl32(pb) != MKTAG('d', 'a', 't', 'a'))
137  return AVERROR_INVALIDDATA;
138  dsf->data_end += avio_rl64(pb);
139 
140  return 0;
141 }
142 
144 {
145  DSFContext *dsf = s->priv_data;
146  AVIOContext *pb = s->pb;
147  AVStream *st = s->streams[0];
148  int64_t pos = avio_tell(pb);
149 
150  if (pos >= dsf->data_end)
151  return AVERROR_EOF;
152 
153  pkt->stream_index = 0;
154  return av_get_packet(pb, pkt, FFMIN(dsf->data_end - pos, st->codecpar->block_align));
155 }
156 
158  .name = "dsf",
159  .long_name = NULL_IF_CONFIG_SMALL("DSD Stream File (DSF)"),
160  .priv_data_size = sizeof(DSFContext),
165 };
AVInputFormat ff_dsf_demuxer
Definition: dsfdec.c:157
#define NULL
Definition: coverity.c:32
const char * s
Definition: avisynth_c.h:768
Bytestream IO Context.
Definition: avio.h:161
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition: error.h:59
#define AV_CH_LAYOUT_SURROUND
static int dsf_read_header(AVFormatContext *s)
Definition: dsfdec.c:63
static const uint64_t dsf_channel_layout[]
Definition: dsfdec.c:38
enum AVCodecID codec_id
Specific type of the encoded data (the codec used).
Definition: avcodec.h:3884
#define ID3v2_DEFAULT_MAGIC
Default magic bytes for ID3v2 header: "ID3".
Definition: id3v2.h:35
int64_t avio_seek(AVIOContext *s, int64_t offset, int whence)
fseek() equivalent for AVIOContext.
Definition: aviobuf.c:246
#define AV_CH_LAYOUT_4POINT0
int64_t avio_skip(AVIOContext *s, int64_t offset)
Skip given number of bytes forward.
Definition: aviobuf.c:331
static AVPacket pkt
#define AV_CH_LAYOUT_STEREO
int ff_id3v2_parse_apic(AVFormatContext *s, ID3v2ExtraMeta **extra_meta)
Create a stream for each APIC (attached picture) extracted from the ID3v2 header. ...
Definition: id3v2.c:1140
Format I/O context.
Definition: avformat.h:1342
#define AV_RL64
Definition: intreadwrite.h:173
void void avpriv_request_sample(void *avc, const char *msg,...) av_printf_format(2
Log a generic warning message about a missing feature.
int ff_id3v2_parse_chapters(AVFormatContext *s, ID3v2ExtraMeta **extra_meta)
Create chapters for all CHAP tags found in the ID3v2 header.
Definition: id3v2.c:1180
static int dsf_read_packet(AVFormatContext *s, AVPacket *pkt)
Definition: dsfdec.c:143
AVStream * avformat_new_stream(AVFormatContext *s, const AVCodec *c)
Add a new stream to a media file.
Definition: utils.c:4441
AVStream ** streams
A list of all streams in the file.
Definition: avformat.h:1410
static int flags
Definition: log.c:55
#define AVERROR_EOF
End of file.
Definition: error.h:55
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
static av_always_inline int64_t avio_tell(AVIOContext *s)
ftell() equivalent for AVIOContext.
Definition: avio.h:557
uint64_t channel_layout
Audio only.
Definition: avcodec.h:3986
int64_t bit_rate
The average bitrate of the encoded data (in bits per second).
Definition: avcodec.h:3913
static int dsf_probe(AVProbeData *p)
Definition: dsfdec.c:31
unsigned int avio_rl32(AVIOContext *s)
Definition: aviobuf.c:770
#define AVERROR(e)
Definition: error.h:43
#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:3880
void ff_id3v2_free_extra_meta(ID3v2ExtraMeta **extra_meta)
Free memory allocated parsing special (non-text) metadata.
Definition: id3v2.c:1124
#define AV_CH_LAYOUT_QUAD
int buf_size
Size of buf except extra allocated bytes.
Definition: avformat.h:451
unsigned char * buf
Buffer must have AVPROBE_PADDING_SIZE of extra allocated bytes filled with zero.
Definition: avformat.h:450
int block_align
Audio only.
Definition: avcodec.h:4001
int seekable
A combination of AVIO_SEEKABLE_ flags or 0 when the stream is not seekable.
Definition: avio.h:260
#define FFMIN(a, b)
Definition: common.h:96
static int read_probe(AVProbeData *pd)
Definition: jvdec.c:55
#define AV_CH_LAYOUT_5POINT1_BACK
#define FF_ARRAY_ELEMS(a)
static int read_header(FFV1Context *f)
Definition: ffv1dec.c:530
Stream structure.
Definition: avformat.h:873
static int read_packet(void *opaque, uint8_t *buf, int buf_size)
Definition: avio_reading.c:42
#define AVIO_SEEKABLE_NORMAL
Seeking works like for a local file.
Definition: avio.h:40
AVIOContext * pb
I/O context.
Definition: avformat.h:1384
#define AVFMT_GENERIC_INDEX
Use generic index building code.
Definition: avformat.h:470
#define AV_CH_LAYOUT_5POINT0_BACK
This structure contains the data a format has to probe a file.
Definition: avformat.h:448
int sample_rate
Audio only.
Definition: avcodec.h:3994
#define AVPROBE_SCORE_MAX
maximum score
Definition: avformat.h:460
Main libavformat public API header.
void ff_id3v2_read(AVFormatContext *s, const char *magic, ID3v2ExtraMeta **extra_meta, unsigned int max_search_size)
Read an ID3v2 tag, including supported extra metadata.
Definition: id3v2.c:1118
#define AVFMT_NO_BYTE_SEEK
Format does not allow seeking by bytes.
Definition: avformat.h:477
void * priv_data
Format private data.
Definition: avformat.h:1370
int channels
Audio only.
Definition: avcodec.h:3990
static void read_id3(AVFormatContext *s, uint64_t id3pos)
Definition: dsfdec.c:49
const char * name
A comma separated list of short names for the format.
Definition: avformat.h:647
AVCodecParameters * codecpar
Codec parameters associated with this stream.
Definition: avformat.h:1020
int stream_index
Definition: avcodec.h:1432
uint64_t data_end
Definition: dsfdec.c:28
#define AV_CH_LAYOUT_MONO
#define MKTAG(a, b, c, d)
Definition: common.h:366
This structure stores compressed data.
Definition: avcodec.h:1407
uint64_t avio_rl64(AVIOContext *s)
Definition: aviobuf.c:778