FFmpeg
 All Data Structures Namespaces Files Functions Variables Typedefs Enumerations Enumerator Macros Groups Pages
nistspheredec.c
Go to the documentation of this file.
1 /*
2  * NIST Sphere demuxer
3  * Copyright (c) 2012 Paul B Mahol
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/avstring.h"
23 #include "libavutil/intreadwrite.h"
24 #include "avformat.h"
25 #include "internal.h"
26 #include "pcm.h"
27 
28 static int nist_probe(AVProbeData *p)
29 {
30  if (AV_RL64(p->buf) == AV_RL64("NIST_1A\x0a"))
31  return AVPROBE_SCORE_MAX;
32  return 0;
33 }
34 
36 {
37  char buffer[256], coding[32] = "pcm", format[32] = "01";
38  int bps = 0, be = 0;
39  int32_t header_size = -1;
40  AVStream *st;
41 
42  st = avformat_new_stream(s, NULL);
43  if (!st)
44  return AVERROR(ENOMEM);
45 
47 
48  ff_get_line(s->pb, buffer, sizeof(buffer));
49  ff_get_line(s->pb, buffer, sizeof(buffer));
50  sscanf(buffer, "%"SCNd32, &header_size);
51  if (header_size <= 0)
52  return AVERROR_INVALIDDATA;
53 
54  while (!avio_feof(s->pb)) {
55  ff_get_line(s->pb, buffer, sizeof(buffer));
56 
57  if (avio_tell(s->pb) >= header_size)
58  return AVERROR_INVALIDDATA;
59 
60  if (!memcmp(buffer, "end_head", 8)) {
62  st->codecpar->bits_per_coded_sample = bps << 3;
63 
64  if (!av_strcasecmp(coding, "pcm")) {
67  0, be, 0xFFFF);
68  } else if (!av_strcasecmp(coding, "alaw")) {
70  } else if (!av_strcasecmp(coding, "ulaw") ||
71  !av_strcasecmp(coding, "mu-law")) {
73  } else if (!av_strncasecmp(coding, "pcm,embedded-shorten", 20)) {
75  if (ff_alloc_extradata(st->codecpar, 1))
76  st->codecpar->extradata[0] = 1;
77  } else {
78  avpriv_request_sample(s, "coding %s", coding);
79  }
80 
81  avpriv_set_pts_info(st, 64, 1, st->codecpar->sample_rate);
82 
84 
85  if (avio_tell(s->pb) > header_size)
86  return AVERROR_INVALIDDATA;
87 
88  avio_skip(s->pb, header_size - avio_tell(s->pb));
89 
90  return 0;
91  } else if (!memcmp(buffer, "channel_count", 13)) {
92  sscanf(buffer, "%*s %*s %"SCNd32, &st->codecpar->channels);
93  } else if (!memcmp(buffer, "sample_byte_format", 18)) {
94  sscanf(buffer, "%*s %*s %31s", format);
95 
96  if (!av_strcasecmp(format, "01")) {
97  be = 0;
98  } else if (!av_strcasecmp(format, "10")) {
99  be = 1;
100  } else if (!av_strcasecmp(format, "mu-law")) {
102  } else if (av_strcasecmp(format, "1")) {
103  avpriv_request_sample(s, "sample byte format %s", format);
104  return AVERROR_PATCHWELCOME;
105  }
106  } else if (!memcmp(buffer, "sample_coding", 13)) {
107  sscanf(buffer, "%*s %*s %31s", coding);
108  } else if (!memcmp(buffer, "sample_count", 12)) {
109  sscanf(buffer, "%*s %*s %"SCNd64, &st->duration);
110  } else if (!memcmp(buffer, "sample_n_bytes", 14)) {
111  sscanf(buffer, "%*s %*s %"SCNd32, &bps);
112  } else if (!memcmp(buffer, "sample_rate", 11)) {
113  sscanf(buffer, "%*s %*s %"SCNd32, &st->codecpar->sample_rate);
114  } else if (!memcmp(buffer, "sample_sig_bits", 15)) {
115  sscanf(buffer, "%*s %*s %"SCNd32, &st->codecpar->bits_per_coded_sample);
116  } else {
117  char key[32], value[32];
118  if (sscanf(buffer, "%31s %*s %31s", key, value) == 2) {
119  av_dict_set(&s->metadata, key, value, AV_DICT_APPEND);
120  } else {
121  av_log(s, AV_LOG_ERROR, "Failed to parse '%s' as metadata\n", buffer);
122  }
123  }
124  }
125 
126  return AVERROR_EOF;
127 }
128 
130  .name = "nistsphere",
131  .long_name = NULL_IF_CONFIG_SMALL("NIST SPeech HEader REsources"),
132  .read_probe = nist_probe,
133  .read_header = nist_read_header,
134  .read_packet = ff_pcm_read_packet,
135  .read_seek = ff_pcm_read_seek,
136  .extensions = "nist,sph",
137  .flags = AVFMT_GENERIC_INDEX,
138 };
#define NULL
Definition: coverity.c:32
const char * s
Definition: avisynth_c.h:768
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition: error.h:59
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:4549
enum AVCodecID codec_id
Specific type of the encoded data (the codec used).
Definition: avcodec.h:3979
int av_strncasecmp(const char *a, const char *b, size_t n)
Locale-independent case-insensitive compare.
Definition: avstring.c:223
int64_t avio_skip(AVIOContext *s, int64_t offset)
Skip given number of bytes forward.
Definition: aviobuf.c:304
uint64_t_TMPL AV_RL64
Definition: bytestream.h:87
Format I/O context.
Definition: avformat.h:1330
void void avpriv_request_sample(void *avc, const char *msg,...) av_printf_format(2
Log a generic warning message about a missing feature.
AVStream * avformat_new_stream(AVFormatContext *s, const AVCodec *c)
Add a new stream to a media file.
Definition: utils.c:4182
#define AVERROR_EOF
End of file.
Definition: error.h:55
static av_always_inline int64_t avio_tell(AVIOContext *s)
ftell() equivalent for AVIOContext.
Definition: avio.h:511
#define av_log(a,...)
static int nist_read_header(AVFormatContext *s)
Definition: nistspheredec.c:35
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:176
AVDictionary * metadata
Metadata that applies to the whole file.
Definition: avformat.h:1546
#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:176
enum AVMediaType codec_type
General type of the encoded data.
Definition: avcodec.h:3975
unsigned char * buf
Buffer must have AVPROBE_PADDING_SIZE of extra allocated bytes filled with zero.
Definition: avformat.h:463
int block_align
Audio only.
Definition: avcodec.h:4096
int ff_alloc_extradata(AVCodecParameters *par, int size)
Allocate extradata with additional AV_INPUT_BUFFER_PADDING_SIZE at end which is always set to 0...
Definition: utils.c:3165
int av_strcasecmp(const char *a, const char *b)
Locale-independent case-insensitive compare.
Definition: avstring.c:213
static int nist_probe(AVProbeData *p)
Definition: nistspheredec.c:28
GLsizei GLboolean const GLfloat * value
Definition: opengl_enc.c:109
int32_t
#define AV_DICT_APPEND
If the entry already exists, append to it.
Definition: dict.h:80
int ff_get_line(AVIOContext *s, char *buf, int maxlen)
Read a whole line of text from AVIOContext.
Definition: aviobuf.c:765
int ff_pcm_read_seek(AVFormatContext *s, int stream_index, int64_t timestamp, int flags)
Definition: pcm.c:45
Stream structure.
Definition: avformat.h:881
#define AVERROR_PATCHWELCOME
Not yet implemented in FFmpeg, patches welcome.
Definition: error.h:62
int ff_pcm_read_packet(AVFormatContext *s, AVPacket *pkt)
Definition: pcm.c:29
AVIOContext * pb
I/O context.
Definition: avformat.h:1372
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 const char * format
Definition: movenc.c:47
#define AVFMT_GENERIC_INDEX
Use generic index building code.
Definition: avformat.h:487
enum AVCodecID ff_get_pcm_codec_id(int bps, int flt, int be, int sflags)
Select a PCM codec based on the given parameters.
Definition: utils.c:3014
AVInputFormat ff_nistsphere_demuxer
This structure contains the data a format has to probe a file.
Definition: avformat.h:461
int64_t duration
Decoding: duration of the stream, in stream time base.
Definition: avformat.h:935
int sample_rate
Audio only.
Definition: avcodec.h:4089
#define AVPROBE_SCORE_MAX
maximum score
Definition: avformat.h:473
Main libavformat public API header.
unsigned bps
Definition: movenc.c:1383
int bits_per_coded_sample
The number of bits per sample in the codedwords.
Definition: avcodec.h:4021
uint8_t * extradata
Extra binary data needed for initializing the decoder, codec-dependent.
Definition: avcodec.h:3993
int channels
Audio only.
Definition: avcodec.h:4085
const char * name
A comma separated list of short names for the format.
Definition: avformat.h:662
AVCodecParameters * codecpar
Definition: avformat.h:1233
int avio_feof(AVIOContext *s)
feof() equivalent for AVIOContext.
Definition: aviobuf.c:328
GLuint buffer
Definition: opengl_enc.c:102