FFmpeg
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 
23 #include "libavutil/intreadwrite.h"
24 #include "avformat.h"
25 #include "internal.h"
26 #include "id3v2.h"
27 
28 typedef struct {
29  uint64_t data_end;
30  uint64_t audio_size;
31  uint64_t data_size;
32 } DSFContext;
33 
34 static int dsf_probe(const AVProbeData *p)
35 {
36  if (p->buf_size < 12 || memcmp(p->buf, "DSD ", 4) || AV_RL64(p->buf + 4) != 28)
37  return 0;
38  return AVPROBE_SCORE_MAX;
39 }
40 
41 static const uint64_t dsf_channel_layout[] = {
42  0,
50 };
51 
52 static void read_id3(AVFormatContext *s, uint64_t id3pos)
53 {
54  ID3v2ExtraMeta *id3v2_extra_meta;
55  if (avio_seek(s->pb, id3pos, SEEK_SET) < 0)
56  return;
57 
58  ff_id3v2_read(s, ID3v2_DEFAULT_MAGIC, &id3v2_extra_meta, 0);
59  if (id3v2_extra_meta) {
60  ff_id3v2_parse_apic(s, id3v2_extra_meta);
61  ff_id3v2_parse_chapters(s, id3v2_extra_meta);
62  }
63  ff_id3v2_free_extra_meta(&id3v2_extra_meta);
64 }
65 
67 {
68  DSFContext *dsf = s->priv_data;
69  AVIOContext *pb = s->pb;
70  AVStream *st;
71  uint64_t id3pos;
72  unsigned int channel_type;
73 
74  avio_skip(pb, 4);
75  if (avio_rl64(pb) != 28)
76  return AVERROR_INVALIDDATA;
77 
78  /* create primary stream before any id3 coverart streams */
79  st = avformat_new_stream(s, NULL);
80  if (!st)
81  return AVERROR(ENOMEM);
82 
83  avio_skip(pb, 8);
84  id3pos = avio_rl64(pb);
85  if (pb->seekable & AVIO_SEEKABLE_NORMAL) {
86  read_id3(s, id3pos);
87  avio_seek(pb, 28, SEEK_SET);
88  }
89 
90  /* fmt chunk */
91 
92  if (avio_rl32(pb) != MKTAG('f', 'm', 't', ' ') || avio_rl64(pb) != 52)
93  return AVERROR_INVALIDDATA;
94 
95  if (avio_rl32(pb) != 1) {
96  avpriv_request_sample(s, "unknown format version");
97  return AVERROR_INVALIDDATA;
98  }
99 
100  if (avio_rl32(pb)) {
101  avpriv_request_sample(s, "unknown format id");
102  return AVERROR_INVALIDDATA;
103  }
104 
105  channel_type = avio_rl32(pb);
106  if (channel_type < FF_ARRAY_ELEMS(dsf_channel_layout))
107  st->codecpar->channel_layout = dsf_channel_layout[channel_type];
108  if (!st->codecpar->channel_layout)
109  avpriv_request_sample(s, "channel type %i", channel_type);
110 
112  st->codecpar->channels = avio_rl32(pb);
113  st->codecpar->sample_rate = avio_rl32(pb) / 8;
114 
115  if (st->codecpar->channels <= 0)
116  return AVERROR_INVALIDDATA;
117 
118  switch(avio_rl32(pb)) {
119  case 1: st->codecpar->codec_id = AV_CODEC_ID_DSD_LSBF_PLANAR; break;
120  case 8: st->codecpar->codec_id = AV_CODEC_ID_DSD_MSBF_PLANAR; break;
121  default:
122  avpriv_request_sample(s, "unknown most significant bit");
123  return AVERROR_INVALIDDATA;
124  }
125 
126  dsf->audio_size = avio_rl64(pb) / 8 * st->codecpar->channels;
127  st->codecpar->block_align = avio_rl32(pb);
128  if (st->codecpar->block_align > INT_MAX / st->codecpar->channels || st->codecpar->block_align <= 0) {
129  avpriv_request_sample(s, "block_align invalid");
130  return AVERROR_INVALIDDATA;
131  }
132  st->codecpar->block_align *= st->codecpar->channels;
133  st->codecpar->bit_rate = st->codecpar->channels * 8LL * st->codecpar->sample_rate;
134  avpriv_set_pts_info(st, 64, 1, st->codecpar->sample_rate);
135  avio_skip(pb, 4);
136 
137  /* data chunk */
138 
139  dsf->data_end = avio_tell(pb);
140  if (avio_rl32(pb) != MKTAG('d', 'a', 't', 'a'))
141  return AVERROR_INVALIDDATA;
142  dsf->data_size = avio_rl64(pb) - 12;
143  dsf->data_end += dsf->data_size + 12;
144  s->internal->data_offset = avio_tell(pb);
145 
146  return 0;
147 }
148 
150 {
151  DSFContext *dsf = s->priv_data;
152  AVIOContext *pb = s->pb;
153  AVStream *st = s->streams[0];
154  int64_t pos = avio_tell(pb);
155  int ret;
156 
157  if (pos >= dsf->data_end)
158  return AVERROR_EOF;
159 
160  if (dsf->data_size > dsf->audio_size) {
161  int last_packet = pos == (dsf->data_end - st->codecpar->block_align);
162 
163  if (last_packet) {
164  int64_t data_pos = pos - s->internal->data_offset;
165  int64_t packet_size = dsf->audio_size - data_pos;
166  int64_t skip_size = dsf->data_size - data_pos - packet_size;
167  uint8_t *dst;
168  int ch, ret;
169 
170  if (packet_size <= 0 || skip_size <= 0)
171  return AVERROR_INVALIDDATA;
172 
173  if ((ret = av_new_packet(pkt, packet_size)) < 0)
174  return ret;
175  dst = pkt->data;
176  for (ch = 0; ch < st->codecpar->channels; ch++) {
177  ret = avio_read(pb, dst, packet_size / st->codecpar->channels);
178  if (ret < packet_size / st->codecpar->channels)
179  return AVERROR_EOF;
180 
181  dst += ret;
182  avio_skip(pb, skip_size / st->codecpar->channels);
183  }
184 
185  pkt->pos = pos;
186  pkt->stream_index = 0;
187  pkt->pts = (pos - s->internal->data_offset) / st->codecpar->channels;
188  pkt->duration = packet_size / st->codecpar->channels;
189  return 0;
190  }
191  }
192  ret = av_get_packet(pb, pkt, FFMIN(dsf->data_end - pos, st->codecpar->block_align));
193  if (ret < 0)
194  return ret;
195 
196  pkt->stream_index = 0;
197  pkt->pts = (pos - s->internal->data_offset) / st->codecpar->channels;
199 
200  return 0;
201 }
202 
204  .name = "dsf",
205  .long_name = NULL_IF_CONFIG_SMALL("DSD Stream File (DSF)"),
206  .priv_data_size = sizeof(DSFContext),
211 };
AV_CH_LAYOUT_5POINT0_BACK
#define AV_CH_LAYOUT_5POINT0_BACK
Definition: channel_layout.h:102
AVFMT_NO_BYTE_SEEK
#define AVFMT_NO_BYTE_SEEK
Format does not allow seeking by bytes.
Definition: avformat.h:475
AVERROR
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
avformat_new_stream
AVStream * avformat_new_stream(AVFormatContext *s, const AVCodec *c)
Add a new stream to a media file.
Definition: utils.c:4375
AVCodecParameters::codec_type
enum AVMediaType codec_type
General type of the encoded data.
Definition: codec_par.h:56
AV_RL64
uint64_t_TMPL AV_RL64
Definition: bytestream.h:91
AVERROR_EOF
#define AVERROR_EOF
End of file.
Definition: error.h:57
AV_CH_LAYOUT_MONO
#define AV_CH_LAYOUT_MONO
Definition: channel_layout.h:90
id3v2.h
AVPacket::data
uint8_t * data
Definition: packet.h:373
ff_id3v2_read
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:1135
AVPacket::duration
int64_t duration
Duration of this packet in AVStream->time_base units, 0 if unknown.
Definition: packet.h:391
AVProbeData::buf_size
int buf_size
Size of buf except extra allocated bytes.
Definition: avformat.h:449
AV_CODEC_ID_DSD_MSBF_PLANAR
@ AV_CODEC_ID_DSD_MSBF_PLANAR
Definition: codec_id.h:498
AVPROBE_SCORE_MAX
#define AVPROBE_SCORE_MAX
maximum score
Definition: avformat.h:458
AVCodecParameters::channels
int channels
Audio only.
Definition: codec_par.h:166
avio_tell
static av_always_inline int64_t avio_tell(AVIOContext *s)
ftell() equivalent for AVIOContext.
Definition: avio.h:538
AVFMT_GENERIC_INDEX
#define AVFMT_GENERIC_INDEX
Use generic index building code.
Definition: avformat.h:468
DSFContext::audio_size
uint64_t audio_size
Definition: dsfdec.c:30
AV_CH_LAYOUT_STEREO
#define AV_CH_LAYOUT_STEREO
Definition: channel_layout.h:91
ff_id3v2_parse_chapters
int ff_id3v2_parse_chapters(AVFormatContext *s, ID3v2ExtraMeta *cur)
Create chapters for all CHAP tags found in the ID3v2 header.
Definition: id3v2.c:1188
AV_CH_LAYOUT_QUAD
#define AV_CH_LAYOUT_QUAD
Definition: channel_layout.h:99
DSFContext::data_size
uint64_t data_size
Definition: dsfdec.c:31
pkt
AVPacket * pkt
Definition: movenc.c:59
AVInputFormat
Definition: avformat.h:626
FF_ARRAY_ELEMS
#define FF_ARRAY_ELEMS(a)
Definition: sinewin_tablegen.c:29
ID3v2ExtraMeta
Definition: id3v2.h:84
intreadwrite.h
s
#define s(width, name)
Definition: cbs_vp9.c:257
av_new_packet
int av_new_packet(AVPacket *pkt, int size)
Allocate the payload of a packet and initialize its fields with default values.
Definition: avpacket.c:94
AVInputFormat::name
const char * name
A comma separated list of short names for the format.
Definition: avformat.h:631
AVProbeData::buf
unsigned char * buf
Buffer must have AVPROBE_PADDING_SIZE of extra allocated bytes filled with zero.
Definition: avformat.h:448
AVMEDIA_TYPE_AUDIO
@ AVMEDIA_TYPE_AUDIO
Definition: avutil.h:202
dsf_read_packet
static int dsf_read_packet(AVFormatContext *s, AVPacket *pkt)
Definition: dsfdec.c:149
AVFormatContext
Format I/O context.
Definition: avformat.h:1107
internal.h
AVStream::codecpar
AVCodecParameters * codecpar
Codec parameters associated with this stream.
Definition: avformat.h:994
read_header
static int read_header(FFV1Context *f)
Definition: ffv1dec.c:527
NULL
#define NULL
Definition: coverity.c:32
read_probe
static int read_probe(const AVProbeData *pd)
Definition: jvdec.c:55
ff_id3v2_parse_apic
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:1157
AVProbeData
This structure contains the data a format has to probe a file.
Definition: avformat.h:446
AVCodecParameters::sample_rate
int sample_rate
Audio only.
Definition: codec_par.h:170
avio_rl32
unsigned int avio_rl32(AVIOContext *s)
Definition: aviobuf.c:733
AVIOContext
Bytestream IO Context.
Definition: avio.h:161
read_id3
static void read_id3(AVFormatContext *s, uint64_t id3pos)
Definition: dsfdec.c:52
NULL_IF_CONFIG_SMALL
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification.
Definition: internal.h:116
AVIOContext::seekable
int seekable
A combination of AVIO_SEEKABLE_ flags or 0 when the stream is not seekable.
Definition: avio.h:260
avpriv_set_pts_info
void avpriv_set_pts_info(AVStream *s, int pts_wrap_bits, unsigned int pts_num, unsigned int pts_den)
Set the time base and wrapping info for a given stream.
Definition: utils.c:4800
ID3v2_DEFAULT_MAGIC
#define ID3v2_DEFAULT_MAGIC
Default magic bytes for ID3v2 header: "ID3".
Definition: id3v2.h:35
AV_CH_LAYOUT_5POINT1_BACK
#define AV_CH_LAYOUT_5POINT1_BACK
Definition: channel_layout.h:103
DSFContext
Definition: dsfdec.c:28
AVPacket::pts
int64_t pts
Presentation timestamp in AVStream->time_base units; the time at which the decompressed packet will b...
Definition: packet.h:366
AVCodecParameters::block_align
int block_align
Audio only.
Definition: codec_par.h:177
AV_CODEC_ID_DSD_LSBF_PLANAR
@ AV_CODEC_ID_DSD_LSBF_PLANAR
Definition: codec_id.h:497
FFMIN
#define FFMIN(a, b)
Definition: macros.h:49
av_get_packet
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:282
ret
ret
Definition: filter_design.txt:187
read_packet
static int read_packet(void *opaque, uint8_t *buf, int buf_size)
Definition: avio_reading.c:42
AVStream
Stream structure.
Definition: avformat.h:847
avio_seek
int64_t avio_seek(AVIOContext *s, int64_t offset, int whence)
fseek() equivalent for AVIOContext.
Definition: aviobuf.c:243
AV_CH_LAYOUT_SURROUND
#define AV_CH_LAYOUT_SURROUND
Definition: channel_layout.h:94
pos
unsigned int pos
Definition: spdifenc.c:412
avformat.h
ff_dsf_demuxer
const AVInputFormat ff_dsf_demuxer
Definition: dsfdec.c:203
channel_layout.h
AVIO_SEEKABLE_NORMAL
#define AVIO_SEEKABLE_NORMAL
Seeking works like for a local file.
Definition: avio.h:40
DSFContext::data_end
uint64_t data_end
Definition: dsfdec.c:29
dsf_read_header
static int dsf_read_header(AVFormatContext *s)
Definition: dsfdec.c:66
avio_read
int avio_read(AVIOContext *s, unsigned char *buf, int size)
Read size bytes from AVIOContext into buf.
Definition: aviobuf.c:616
AVPacket::stream_index
int stream_index
Definition: packet.h:375
avio_skip
int64_t avio_skip(AVIOContext *s, int64_t offset)
Skip given number of bytes forward.
Definition: aviobuf.c:327
avpriv_request_sample
#define avpriv_request_sample(...)
Definition: tableprint_vlc.h:37
dsf_probe
static int dsf_probe(const AVProbeData *p)
Definition: dsfdec.c:34
AVCodecParameters::codec_id
enum AVCodecID codec_id
Specific type of the encoded data (the codec used).
Definition: codec_par.h:60
AVPacket
This structure stores compressed data.
Definition: packet.h:350
ff_id3v2_free_extra_meta
void ff_id3v2_free_extra_meta(ID3v2ExtraMeta **extra_meta)
Free memory allocated parsing special (non-text) metadata.
Definition: id3v2.c:1141
AVPacket::pos
int64_t pos
byte position in stream, -1 if unknown
Definition: packet.h:393
AVCodecParameters::channel_layout
uint64_t channel_layout
Audio only.
Definition: codec_par.h:162
avio_rl64
uint64_t avio_rl64(AVIOContext *s)
Definition: aviobuf.c:741
AV_CH_LAYOUT_4POINT0
#define AV_CH_LAYOUT_4POINT0
Definition: channel_layout.h:96
flags
#define flags(name, subs,...)
Definition: cbs_av1.c:561
AVCodecParameters::bit_rate
int64_t bit_rate
The average bitrate of the encoded data (in bits per second).
Definition: codec_par.h:89
AVERROR_INVALIDDATA
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition: error.h:61
MKTAG
#define MKTAG(a, b, c, d)
Definition: macros.h:55
dsf_channel_layout
static const uint64_t dsf_channel_layout[]
Definition: dsfdec.c:41