FFmpeg
wsddec.c
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1 /*
2  * Wideband Single-bit Data (WSD) 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 "libavutil/timecode.h"
24 #include "avformat.h"
25 #include "internal.h"
26 #include "rawdec.h"
27 
28 static int wsd_probe(const AVProbeData *p)
29 {
30  if (p->buf_size < 45 || memcmp(p->buf, "1bit", 4) ||
31  !AV_RB32(p->buf + 36) || !p->buf[44] ||
32  (p->buf[0] >= 0x10 && (AV_RB32(p->buf + 20) < 0x80 || AV_RB32(p->buf + 24) < 0x80)))
33  return 0;
34  return AVPROBE_SCORE_MAX;
35 }
36 
37 static int empty_string(const char *buf, unsigned size)
38 {
39  while (size--) {
40  if (*buf++ != ' ')
41  return 0;
42  }
43  return 1;
44 }
45 
47 {
48  switch (bit) {
49  case 2: return AV_CH_BACK_RIGHT;
50  case 3:
51  avpriv_request_sample(s, "Rr-middle");
52  break;
53  case 4: return AV_CH_BACK_CENTER;
54  case 5:
55  avpriv_request_sample(s, "Lr-middle");
56  break;
57  case 6: return AV_CH_BACK_LEFT;
58  case 24: return AV_CH_LOW_FREQUENCY;
59  case 26: return AV_CH_FRONT_RIGHT;
60  case 27: return AV_CH_FRONT_RIGHT_OF_CENTER;
61  case 28: return AV_CH_FRONT_CENTER;
62  case 29: return AV_CH_FRONT_LEFT_OF_CENTER;
63  case 30: return AV_CH_FRONT_LEFT;
64  default:
65  av_log(s, AV_LOG_WARNING, "reserved channel assignment\n");
66  break;
67  }
68  return 0;
69 }
70 
71 static int get_metadata(AVFormatContext *s, const char *const tag, const unsigned size)
72 {
73  uint8_t *buf;
74  if (!(size + 1))
75  return AVERROR(ENOMEM);
76 
77  buf = av_malloc(size + 1);
78  if (!buf)
79  return AVERROR(ENOMEM);
80 
81  if (avio_read(s->pb, buf, size) != size) {
82  av_free(buf);
83  return AVERROR(EIO);
84  }
85 
86  if (empty_string(buf, size)) {
87  av_free(buf);
88  return 0;
89  }
90 
91  buf[size] = 0;
92  av_dict_set(&s->metadata, tag, buf, AV_DICT_DONT_STRDUP_VAL);
93  return 0;
94 }
95 
97 {
98  AVIOContext *pb = s->pb;
99  AVStream *st;
100  int version;
101  uint32_t text_offset, data_offset, channel_assign;
102  char playback_time[AV_TIMECODE_STR_SIZE];
103 
104  st = avformat_new_stream(s, NULL);
105  if (!st)
106  return AVERROR(ENOMEM);
107 
108  avio_skip(pb, 8);
109  version = avio_r8(pb);
110  av_log(s, AV_LOG_DEBUG, "version: %i.%i\n", version >> 4, version & 0xF);
111  avio_skip(pb, 11);
112 
113  if (version < 0x10) {
114  text_offset = 0x80;
115  data_offset = 0x800;
116  avio_skip(pb, 8);
117  } else {
118  text_offset = avio_rb32(pb);
119  data_offset = avio_rb32(pb);
120  }
121 
122  avio_skip(pb, 4);
123  av_timecode_make_smpte_tc_string2(playback_time, (AVRational){1,1}, avio_rb32(pb) & 0x00ffffffU, 1, 1);
124  av_dict_set(&s->metadata, "playback_time", playback_time, 0);
125 
127  st->codecpar->codec_id = s->iformat->raw_codec_id;
128  st->codecpar->sample_rate = avio_rb32(pb) / 8;
129  avio_skip(pb, 4);
130  st->codecpar->channels = avio_r8(pb) & 0xF;
131  st->codecpar->bit_rate = (int64_t)st->codecpar->channels * st->codecpar->sample_rate * 8LL;
132  if (!st->codecpar->channels)
133  return AVERROR_INVALIDDATA;
134 
135  avio_skip(pb, 3);
136  channel_assign = avio_rb32(pb);
137  if (!(channel_assign & 1)) {
138  int i;
139  for (i = 1; i < 32; i++)
140  if ((channel_assign >> i) & 1)
142  }
143 
144  avio_skip(pb, 16);
145  if (avio_rb32(pb))
146  avpriv_request_sample(s, "emphasis");
147 
148  if (avio_seek(pb, text_offset, SEEK_SET) >= 0) {
149  get_metadata(s, "title", 128);
150  get_metadata(s, "composer", 128);
151  get_metadata(s, "song_writer", 128);
152  get_metadata(s, "artist", 128);
153  get_metadata(s, "album", 128);
154  get_metadata(s, "genre", 32);
155  get_metadata(s, "date", 32);
156  get_metadata(s, "location", 32);
157  get_metadata(s, "comment", 512);
158  get_metadata(s, "user", 512);
159  }
160 
161  return avio_seek(pb, data_offset, SEEK_SET);
162 }
163 
166  .name = "wsd",
167  .long_name = NULL_IF_CONFIG_SMALL("Wideband Single-bit Data (WSD)"),
168  .read_probe = wsd_probe,
169  .read_header = wsd_read_header,
170  .read_packet = ff_raw_read_partial_packet,
171  .extensions = "wsd",
173  .raw_codec_id = AV_CODEC_ID_DSD_MSBF,
174  .priv_data_size = sizeof(FFRawDemuxerContext),
175  .priv_class = &wsd_demuxer_class,
176 };
AV_LOG_WARNING
#define AV_LOG_WARNING
Something somehow does not look correct.
Definition: log.h:187
AV_TIMECODE_STR_SIZE
#define AV_TIMECODE_STR_SIZE
Definition: timecode.h:33
AVFMT_NO_BYTE_SEEK
#define AVFMT_NO_BYTE_SEEK
Format does not allow seeking by bytes.
Definition: avformat.h:470
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:4374
AVCodecParameters::codec_type
enum AVMediaType codec_type
General type of the encoded data.
Definition: codec_par.h:56
ff_wsd_demuxer
const AVInputFormat ff_wsd_demuxer
Definition: wsddec.c:165
wsd_to_av_channel_layoyt
static int wsd_to_av_channel_layoyt(AVFormatContext *s, int bit)
Definition: wsddec.c:46
get_metadata
static int get_metadata(AVFormatContext *s, const char *const tag, const unsigned size)
Definition: wsddec.c:71
AVProbeData::buf_size
int buf_size
Size of buf except extra allocated bytes.
Definition: avformat.h:444
av_malloc
#define av_malloc(s)
Definition: tableprint_vlc.h:31
bit
#define bit(string, value)
Definition: cbs_mpeg2.c:58
AVPROBE_SCORE_MAX
#define AVPROBE_SCORE_MAX
maximum score
Definition: avformat.h:453
AVCodecParameters::channels
int channels
Audio only.
Definition: codec_par.h:166
empty_string
static int empty_string(const char *buf, unsigned size)
Definition: wsddec.c:37
U
#define U(x)
Definition: vp56_arith.h:37
timecode.h
AV_CH_BACK_LEFT
#define AV_CH_BACK_LEFT
Definition: channel_layout.h:53
FFRawDemuxerContext
Definition: rawdec.h:37
AVFMT_GENERIC_INDEX
#define AVFMT_GENERIC_INDEX
Use generic index building code.
Definition: avformat.h:463
AV_DICT_DONT_STRDUP_VAL
#define AV_DICT_DONT_STRDUP_VAL
Take ownership of a value that's been allocated with av_malloc() or another memory allocation functio...
Definition: dict.h:74
avio_rb32
unsigned int avio_rb32(AVIOContext *s)
Definition: aviobuf.c:764
AVInputFormat
Definition: avformat.h:616
AV_CH_LOW_FREQUENCY
#define AV_CH_LOW_FREQUENCY
Definition: channel_layout.h:52
ff_raw_read_partial_packet
int ff_raw_read_partial_packet(AVFormatContext *s, AVPacket *pkt)
Definition: rawdec.c:35
intreadwrite.h
s
#define s(width, name)
Definition: cbs_vp9.c:257
AVInputFormat::name
const char * name
A comma separated list of short names for the format.
Definition: avformat.h:621
AVProbeData::buf
unsigned char * buf
Buffer must have AVPROBE_PADDING_SIZE of extra allocated bytes filled with zero.
Definition: avformat.h:443
AVMEDIA_TYPE_AUDIO
@ AVMEDIA_TYPE_AUDIO
Definition: avutil.h:202
AV_LOG_DEBUG
#define AV_LOG_DEBUG
Stuff which is only useful for libav* developers.
Definition: log.h:202
if
if(ret)
Definition: filter_design.txt:179
AVFormatContext
Format I/O context.
Definition: avformat.h:1106
internal.h
AVStream::codecpar
AVCodecParameters * codecpar
Codec parameters associated with this stream.
Definition: avformat.h:979
NULL
#define NULL
Definition: coverity.c:32
rawdec.h
AVRational
Rational number (pair of numerator and denominator).
Definition: rational.h:58
AVProbeData
This structure contains the data a format has to probe a file.
Definition: avformat.h:441
AV_CH_FRONT_CENTER
#define AV_CH_FRONT_CENTER
Definition: channel_layout.h:51
AV_CH_FRONT_LEFT_OF_CENTER
#define AV_CH_FRONT_LEFT_OF_CENTER
Definition: channel_layout.h:55
AVCodecParameters::sample_rate
int sample_rate
Audio only.
Definition: codec_par.h:170
AVIOContext
Bytestream IO Context.
Definition: avio.h:161
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:117
AV_CODEC_ID_DSD_MSBF
@ AV_CODEC_ID_DSD_MSBF
Definition: codec_id.h:495
size
int size
Definition: twinvq_data.h:10344
wsd_probe
static int wsd_probe(const AVProbeData *p)
Definition: wsddec.c:28
AV_RB32
uint64_t_TMPL AV_WL64 unsigned int_TMPL AV_WL32 unsigned int_TMPL AV_WL24 unsigned int_TMPL AV_WL16 uint64_t_TMPL AV_WB64 unsigned int_TMPL AV_RB32
Definition: bytestream.h:96
avio_r8
int avio_r8(AVIOContext *s)
Definition: aviobuf.c:607
AV_CH_FRONT_RIGHT_OF_CENTER
#define AV_CH_FRONT_RIGHT_OF_CENTER
Definition: channel_layout.h:56
version
version
Definition: libkvazaar.c:306
wsd_read_header
static int wsd_read_header(AVFormatContext *s)
Definition: wsddec.c:96
i
int i
Definition: input.c:407
av_timecode_make_smpte_tc_string2
char * av_timecode_make_smpte_tc_string2(char *buf, AVRational rate, uint32_t tcsmpte, int prevent_df, int skip_field)
Get the timecode string from the SMPTE timecode format.
Definition: timecode.c:136
AV_CH_BACK_CENTER
#define AV_CH_BACK_CENTER
Definition: channel_layout.h:57
AV_CH_FRONT_LEFT
#define AV_CH_FRONT_LEFT
Definition: channel_layout.h:49
tag
uint32_t tag
Definition: movenc.c:1594
AVStream
Stream structure.
Definition: avformat.h:832
avio_seek
int64_t avio_seek(AVIOContext *s, int64_t offset, int whence)
fseek() equivalent for AVIOContext.
Definition: aviobuf.c:243
avformat.h
avio_read
int avio_read(AVIOContext *s, unsigned char *buf, int size)
Read size bytes from AVIOContext into buf.
Definition: aviobuf.c:616
avio_skip
int64_t avio_skip(AVIOContext *s, int64_t offset)
Skip given number of bytes forward.
Definition: aviobuf.c:327
AV_CH_FRONT_RIGHT
#define AV_CH_FRONT_RIGHT
Definition: channel_layout.h:50
avpriv_request_sample
#define avpriv_request_sample(...)
Definition: tableprint_vlc.h:39
av_free
#define av_free(p)
Definition: tableprint_vlc.h:34
AVCodecParameters::codec_id
enum AVCodecID codec_id
Specific type of the encoded data (the codec used).
Definition: codec_par.h:60
av_dict_set
int av_dict_set(AVDictionary **pm, const char *key, const char *value, int flags)
Set the given entry in *pm, overwriting an existing entry.
Definition: dict.c:70
AVCodecParameters::channel_layout
uint64_t channel_layout
Audio only.
Definition: codec_par.h:162
AVCodecParameters::bit_rate
int64_t bit_rate
The average bitrate of the encoded data (in bits per second).
Definition: codec_par.h:89
av_log
#define av_log(a,...)
Definition: tableprint_vlc.h:28
AVERROR_INVALIDDATA
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition: error.h:59
AV_CH_BACK_RIGHT
#define AV_CH_BACK_RIGHT
Definition: channel_layout.h:54
FF_RAW_DEMUXER_CLASS
#define FF_RAW_DEMUXER_CLASS(name)
Definition: rawdec.h:55