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;
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_string(playback_time, avio_rb32(pb), 0);
124  av_dict_set(&s->metadata, "playback_time", playback_time, 0);
125 
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 & (1 << i))
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 
165  .name = "wsd",
166  .long_name = NULL_IF_CONFIG_SMALL("Wideband Single-bit Data (WSD)"),
167  .read_probe = wsd_probe,
168  .read_header = wsd_read_header,
169  .read_packet = ff_raw_read_partial_packet,
170  .extensions = "wsd",
172  .raw_codec_id = AV_CODEC_ID_DSD_MSBF,
173 };
#define NULL
Definition: coverity.c:32
Bytestream IO Context.
Definition: avio.h:161
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition: error.h:59
static int wsd_probe(const AVProbeData *p)
Definition: wsddec.c:28
#define AV_LOG_WARNING
Something somehow does not look correct.
Definition: log.h:182
enum AVCodecID codec_id
Specific type of the encoded data (the codec used).
Definition: avcodec.h:3953
int64_t avio_seek(AVIOContext *s, int64_t offset, int whence)
fseek() equivalent for AVIOContext.
Definition: aviobuf.c:246
int64_t avio_skip(AVIOContext *s, int64_t offset)
Skip given number of bytes forward.
Definition: aviobuf.c:331
int version
Definition: avisynth_c.h:858
Format I/O context.
Definition: avformat.h:1358
static int wsd_read_header(AVFormatContext *s)
Definition: wsddec.c:96
void void avpriv_request_sample(void *avc, const char *msg,...) av_printf_format(2
Log a generic warning message about a missing feature.
uint8_t
#define av_malloc(s)
unsigned int avio_rb32(AVIOContext *s)
Definition: aviobuf.c:801
AVStream * avformat_new_stream(AVFormatContext *s, const AVCodec *c)
Add a new stream to a media file.
Definition: utils.c:4455
#define AV_CH_LOW_FREQUENCY
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:87
AVInputFormat ff_wsd_demuxer
Definition: wsddec.c:164
uint32_t tag
Definition: movenc.c:1496
#define AV_CH_BACK_LEFT
ptrdiff_t size
Definition: opengl_enc.c:100
uint64_t channel_layout
Audio only.
Definition: avcodec.h:4055
#define av_log(a,...)
int avio_read(AVIOContext *s, unsigned char *buf, int size)
Read size bytes from AVIOContext into buf.
Definition: aviobuf.c:648
int64_t bit_rate
The average bitrate of the encoded data (in bits per second).
Definition: avcodec.h:3982
#define i(width, name, range_min, range_max)
Definition: cbs_h2645.c:260
AVDictionary * metadata
Metadata that applies to the whole file.
Definition: avformat.h:1598
int ff_raw_read_partial_packet(AVFormatContext *s, AVPacket *pkt)
Definition: rawdec.c:35
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition: internal.h:186
ff_const59 struct AVInputFormat * iformat
The input container format.
Definition: avformat.h:1370
#define AV_LOG_DEBUG
Stuff which is only useful for libav* developers.
Definition: log.h:197
enum AVMediaType codec_type
General type of the encoded data.
Definition: avcodec.h:3949
int avio_r8(AVIOContext *s)
Definition: aviobuf.c:639
int buf_size
Size of buf except extra allocated bytes.
Definition: avformat.h:449
unsigned char * buf
Buffer must have AVPROBE_PADDING_SIZE of extra allocated bytes filled with zero.
Definition: avformat.h:448
#define AV_DICT_DONT_STRDUP_VAL
Take ownership of a value that&#39;s been allocated with av_malloc() or another memory allocation functio...
Definition: dict.h:76
#define s(width, name)
Definition: cbs_vp9.c:257
#define AV_CH_FRONT_LEFT_OF_CENTER
#define AV_CH_FRONT_CENTER
#define AV_CH_FRONT_RIGHT_OF_CENTER
if(ret)
Stream structure.
Definition: avformat.h:881
Timecode helpers header.
AVIOContext * pb
I/O context.
Definition: avformat.h:1400
#define AV_CH_FRONT_LEFT
static int wsd_to_av_channel_layoyt(AVFormatContext *s, int bit)
Definition: wsddec.c:46
void * buf
Definition: avisynth_c.h:766
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
static int get_metadata(AVFormatContext *s, const char *const tag, const unsigned size)
Definition: wsddec.c:71
#define AVFMT_GENERIC_INDEX
Use generic index building code.
Definition: avformat.h:468
This structure contains the data a format has to probe a file.
Definition: avformat.h:446
char * av_timecode_make_smpte_tc_string(char *buf, uint32_t tcsmpte, int prevent_df)
Get the timecode string from the SMPTE timecode format.
Definition: timecode.c:118
int raw_codec_id
Raw demuxers store their codec ID here.
Definition: avformat.h:700
#define AV_CH_BACK_CENTER
static int empty_string(const char *buf, unsigned size)
Definition: wsddec.c:37
int sample_rate
Audio only.
Definition: avcodec.h:4063
#define AVPROBE_SCORE_MAX
maximum score
Definition: avformat.h:458
Main libavformat public API header.
#define av_free(p)
#define AVFMT_NO_BYTE_SEEK
Format does not allow seeking by bytes.
Definition: avformat.h:475
int channels
Audio only.
Definition: avcodec.h:4059
#define AV_CH_FRONT_RIGHT
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
#define AV_CH_BACK_RIGHT
#define AV_TIMECODE_STR_SIZE
Definition: timecode.h:33