FFmpeg  4.4.4
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  uint64_t audio_size;
30  uint64_t data_size;
31 } DSFContext;
32 
33 static int dsf_probe(const AVProbeData *p)
34 {
35  if (p->buf_size < 12 || memcmp(p->buf, "DSD ", 4) || AV_RL64(p->buf + 4) != 28)
36  return 0;
37  return AVPROBE_SCORE_MAX;
38 }
39 
40 static const uint64_t dsf_channel_layout[] = {
41  0,
49 };
50 
51 static void read_id3(AVFormatContext *s, uint64_t id3pos)
52 {
53  ID3v2ExtraMeta *id3v2_extra_meta = NULL;
54  if (avio_seek(s->pb, id3pos, SEEK_SET) < 0)
55  return;
56 
57  ff_id3v2_read(s, ID3v2_DEFAULT_MAGIC, &id3v2_extra_meta, 0);
58  if (id3v2_extra_meta) {
59  ff_id3v2_parse_apic(s, id3v2_extra_meta);
60  ff_id3v2_parse_chapters(s, id3v2_extra_meta);
61  }
62  ff_id3v2_free_extra_meta(&id3v2_extra_meta);
63 }
64 
66 {
67  DSFContext *dsf = s->priv_data;
68  AVIOContext *pb = s->pb;
69  AVStream *st;
70  uint64_t id3pos;
71  unsigned int channel_type;
72 
73  avio_skip(pb, 4);
74  if (avio_rl64(pb) != 28)
75  return AVERROR_INVALIDDATA;
76 
77  /* create primary stream before any id3 coverart streams */
78  st = avformat_new_stream(s, NULL);
79  if (!st)
80  return AVERROR(ENOMEM);
81 
82  avio_skip(pb, 8);
83  id3pos = avio_rl64(pb);
84  if (pb->seekable & AVIO_SEEKABLE_NORMAL) {
85  read_id3(s, id3pos);
86  avio_seek(pb, 28, SEEK_SET);
87  }
88 
89  /* fmt chunk */
90 
91  if (avio_rl32(pb) != MKTAG('f', 'm', 't', ' ') || avio_rl64(pb) != 52)
92  return AVERROR_INVALIDDATA;
93 
94  if (avio_rl32(pb) != 1) {
95  avpriv_request_sample(s, "unknown format version");
96  return AVERROR_INVALIDDATA;
97  }
98 
99  if (avio_rl32(pb)) {
100  avpriv_request_sample(s, "unknown format id");
101  return AVERROR_INVALIDDATA;
102  }
103 
104  channel_type = avio_rl32(pb);
105  if (channel_type < FF_ARRAY_ELEMS(dsf_channel_layout))
106  st->codecpar->channel_layout = dsf_channel_layout[channel_type];
107  if (!st->codecpar->channel_layout)
108  avpriv_request_sample(s, "channel type %i", channel_type);
109 
111  st->codecpar->channels = avio_rl32(pb);
112  st->codecpar->sample_rate = avio_rl32(pb) / 8;
113 
114  if (st->codecpar->channels <= 0)
115  return AVERROR_INVALIDDATA;
116 
117  switch(avio_rl32(pb)) {
118  case 1: st->codecpar->codec_id = AV_CODEC_ID_DSD_LSBF_PLANAR; break;
119  case 8: st->codecpar->codec_id = AV_CODEC_ID_DSD_MSBF_PLANAR; break;
120  default:
121  avpriv_request_sample(s, "unknown most significant bit");
122  return AVERROR_INVALIDDATA;
123  }
124 
125  dsf->audio_size = avio_rl64(pb) / 8 * st->codecpar->channels;
126  st->codecpar->block_align = avio_rl32(pb);
127  if (st->codecpar->block_align > INT_MAX / st->codecpar->channels || st->codecpar->block_align <= 0) {
128  avpriv_request_sample(s, "block_align invalid");
129  return AVERROR_INVALIDDATA;
130  }
131  st->codecpar->block_align *= st->codecpar->channels;
132  st->codecpar->bit_rate = st->codecpar->channels * 8LL * st->codecpar->sample_rate;
133  avpriv_set_pts_info(st, 64, 1, st->codecpar->sample_rate);
134  avio_skip(pb, 4);
135 
136  /* data chunk */
137 
138  dsf->data_end = avio_tell(pb);
139  if (avio_rl32(pb) != MKTAG('d', 'a', 't', 'a'))
140  return AVERROR_INVALIDDATA;
141  dsf->data_size = avio_rl64(pb) - 12;
142  dsf->data_end += dsf->data_size + 12;
143  s->internal->data_offset = avio_tell(pb);
144 
145  return 0;
146 }
147 
149 {
150  DSFContext *dsf = s->priv_data;
151  AVIOContext *pb = s->pb;
152  AVStream *st = s->streams[0];
153  int64_t pos = avio_tell(pb);
154  int ret;
155 
156  if (pos >= dsf->data_end)
157  return AVERROR_EOF;
158 
159  if (dsf->data_size > dsf->audio_size) {
160  int last_packet = pos == (dsf->data_end - st->codecpar->block_align);
161 
162  if (last_packet) {
163  int64_t data_pos = pos - s->internal->data_offset;
164  int64_t packet_size = dsf->audio_size - data_pos;
165  int64_t skip_size = dsf->data_size - data_pos - packet_size;
166  uint8_t *dst;
167  int ch, ret;
168 
169  if (packet_size <= 0 || skip_size <= 0)
170  return AVERROR_INVALIDDATA;
171 
172  if ((ret = av_new_packet(pkt, packet_size)) < 0)
173  return ret;
174  dst = pkt->data;
175  for (ch = 0; ch < st->codecpar->channels; ch++) {
176  ret = avio_read(pb, dst, packet_size / st->codecpar->channels);
177  if (ret < packet_size / st->codecpar->channels)
178  return AVERROR_EOF;
179 
180  dst += ret;
181  avio_skip(pb, skip_size / st->codecpar->channels);
182  }
183 
184  pkt->pos = pos;
185  pkt->stream_index = 0;
186  pkt->pts = (pos - s->internal->data_offset) / st->codecpar->channels;
187  pkt->duration = packet_size / st->codecpar->channels;
188  return 0;
189  }
190  }
191  ret = av_get_packet(pb, pkt, FFMIN(dsf->data_end - pos, st->codecpar->block_align));
192  if (ret < 0)
193  return ret;
194 
195  pkt->stream_index = 0;
196  pkt->pts = (pos - s->internal->data_offset) / st->codecpar->channels;
198 
199  return 0;
200 }
201 
203  .name = "dsf",
204  .long_name = NULL_IF_CONFIG_SMALL("DSD Stream File (DSF)"),
205  .priv_data_size = sizeof(DSFContext),
210 };
uint8_t
Main libavformat public API header.
#define AVPROBE_SCORE_MAX
maximum score
Definition: avformat.h:453
#define AVFMT_NO_BYTE_SEEK
Format does not allow seeking by bytes.
Definition: avformat.h:470
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 AVFMT_GENERIC_INDEX
Use generic index building code.
Definition: avformat.h:463
int64_t avio_seek(AVIOContext *s, int64_t offset, int whence)
fseek() equivalent for AVIOContext.
Definition: aviobuf.c:253
#define AVIO_SEEKABLE_NORMAL
Seeking works like for a local file.
Definition: avio.h:40
static av_always_inline int64_t avio_tell(AVIOContext *s)
ftell() equivalent for AVIOContext.
Definition: avio.h:557
int64_t avio_skip(AVIOContext *s, int64_t offset)
Skip given number of bytes forward.
Definition: aviobuf.c:337
int avio_read(AVIOContext *s, unsigned char *buf, int size)
Read size bytes from AVIOContext into buf.
Definition: aviobuf.c:633
unsigned int avio_rl32(AVIOContext *s)
Definition: aviobuf.c:750
uint64_t avio_rl64(AVIOContext *s)
Definition: aviobuf.c:758
static int read_packet(void *opaque, uint8_t *buf, int buf_size)
Definition: avio_reading.c:42
#define AV_RL64
Definition: intreadwrite.h:173
#define flags(name, subs,...)
Definition: cbs_av1.c:561
#define s(width, name)
Definition: cbs_vp9.c:257
#define FFMIN(a, b)
Definition: common.h:105
#define MKTAG(a, b, c, d)
Definition: common.h:478
#define NULL
Definition: coverity.c:32
static int dsf_probe(const AVProbeData *p)
Definition: dsfdec.c:33
static const uint64_t dsf_channel_layout[]
Definition: dsfdec.c:40
AVInputFormat ff_dsf_demuxer
Definition: dsfdec.c:202
static int dsf_read_packet(AVFormatContext *s, AVPacket *pkt)
Definition: dsfdec.c:148
static int dsf_read_header(AVFormatContext *s)
Definition: dsfdec.c:65
static void read_id3(AVFormatContext *s, uint64_t id3pos)
Definition: dsfdec.c:51
static int read_header(FFV1Context *f)
Definition: ffv1dec.c:545
#define AV_CH_LAYOUT_QUAD
#define AV_CH_LAYOUT_4POINT0
#define AV_CH_LAYOUT_MONO
#define AV_CH_LAYOUT_SURROUND
#define AV_CH_LAYOUT_5POINT0_BACK
#define AV_CH_LAYOUT_STEREO
#define AV_CH_LAYOUT_5POINT1_BACK
@ AV_CODEC_ID_DSD_MSBF_PLANAR
Definition: codec_id.h:501
@ AV_CODEC_ID_DSD_LSBF_PLANAR
Definition: codec_id.h:500
int av_new_packet(AVPacket *pkt, int size)
Allocate the payload of a packet and initialize its fields with default values.
Definition: avpacket.c:99
AVStream * avformat_new_stream(AVFormatContext *s, const AVCodec *c)
Add a new stream to a media file.
Definition: utils.c:4509
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition: error.h:59
#define AVERROR_EOF
End of file.
Definition: error.h:55
#define AVERROR(e)
Definition: error.h:43
@ AVMEDIA_TYPE_AUDIO
Definition: avutil.h:202
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:1120
void ff_id3v2_free_extra_meta(ID3v2ExtraMeta **extra_meta)
Free memory allocated parsing special (non-text) metadata.
Definition: id3v2.c:1126
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:1142
int ff_id3v2_parse_chapters(AVFormatContext *s, ID3v2ExtraMeta *extra_meta)
Create chapters for all CHAP tags found in the ID3v2 header.
Definition: id3v2.c:1182
#define ID3v2_DEFAULT_MAGIC
Default magic bytes for ID3v2 header: "ID3".
Definition: id3v2.h:35
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:4945
static int read_probe(const AVProbeData *pd)
Definition: jvdec.c:55
common internal API header
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification.
Definition: internal.h:117
#define FF_ARRAY_ELEMS(a)
unsigned int pos
Definition: spdifenc.c:412
uint64_t channel_layout
Audio only.
Definition: codec_par.h:162
int channels
Audio only.
Definition: codec_par.h:166
int64_t bit_rate
The average bitrate of the encoded data (in bits per second).
Definition: codec_par.h:89
enum AVMediaType codec_type
General type of the encoded data.
Definition: codec_par.h:56
int block_align
Audio only.
Definition: codec_par.h:177
enum AVCodecID codec_id
Specific type of the encoded data (the codec used).
Definition: codec_par.h:60
int sample_rate
Audio only.
Definition: codec_par.h:170
Format I/O context.
Definition: avformat.h:1232
Bytestream IO Context.
Definition: avio.h:161
int seekable
A combination of AVIO_SEEKABLE_ flags or 0 when the stream is not seekable.
Definition: avio.h:260
const char * name
A comma separated list of short names for the format.
Definition: avformat.h:645
This structure stores compressed data.
Definition: packet.h:346
int stream_index
Definition: packet.h:371
int64_t duration
Duration of this packet in AVStream->time_base units, 0 if unknown.
Definition: packet.h:387
int64_t pts
Presentation timestamp in AVStream->time_base units; the time at which the decompressed packet will b...
Definition: packet.h:362
uint8_t * data
Definition: packet.h:369
int64_t pos
byte position in stream, -1 if unknown
Definition: packet.h:389
This structure contains the data a format has to probe a file.
Definition: avformat.h:441
int buf_size
Size of buf except extra allocated bytes.
Definition: avformat.h:444
unsigned char * buf
Buffer must have AVPROBE_PADDING_SIZE of extra allocated bytes filled with zero.
Definition: avformat.h:443
Stream structure.
Definition: avformat.h:873
AVCodecParameters * codecpar
Codec parameters associated with this stream.
Definition: avformat.h:1038
uint64_t data_size
Definition: dsfdec.c:30
uint64_t audio_size
Definition: dsfdec.c:29
uint64_t data_end
Definition: dsfdec.c:28
#define avpriv_request_sample(...)
AVPacket * pkt
Definition: movenc.c:59