FFmpeg
riffdec.c
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1 /*
2  * RIFF demuxing functions and data
3  * Copyright (c) 2000 Fabrice Bellard
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/avassert.h"
23 #include "libavutil/dict.h"
24 #include "libavutil/error.h"
25 #include "libavutil/intreadwrite.h"
26 #include "libavutil/log.h"
27 #include "avformat.h"
28 #include "avio_internal.h"
29 #include "riff.h"
30 
32 {
33  int ret;
34  av_assert0(sizeof(*g) == 16); //compiler will optimize this out
35  ret = ffio_read_size(s, *g, sizeof(*g));
36  if (ret < 0) {
37  memset(*g, 0, sizeof(*g));
38  return ret;
39  }
40  return 0;
41 }
42 
44 {
45  int i;
46  for (i = 0; guids[i].id != AV_CODEC_ID_NONE; i++)
47  if (!ff_guidcmp(guids[i].guid, guid))
48  return guids[i].id;
49  return AV_CODEC_ID_NONE;
50 }
51 
52 /* We could be given one of the three possible structures here:
53  * WAVEFORMAT, PCMWAVEFORMAT or WAVEFORMATEX. Each structure
54  * is an expansion of the previous one with the fields added
55  * at the bottom. PCMWAVEFORMAT adds 'WORD wBitsPerSample' and
56  * WAVEFORMATEX adds 'WORD cbSize' and basically makes itself
57  * an openended structure.
58  */
59 
61 {
62  ff_asf_guid subformat;
63  int bps;
64 
65  bps = avio_rl16(pb);
66  if (bps)
68  par->channel_layout = avio_rl32(pb); /* dwChannelMask */
69 
70  ff_get_guid(pb, &subformat);
71  if (!memcmp(subformat + 4,
72  (const uint8_t[]){ FF_AMBISONIC_BASE_GUID }, 12) ||
73  !memcmp(subformat + 4,
74  (const uint8_t[]){ FF_BROKEN_BASE_GUID }, 12) ||
75  !memcmp(subformat + 4,
76  (const uint8_t[]){ FF_MEDIASUBTYPE_BASE_GUID }, 12)) {
77  par->codec_tag = AV_RL32(subformat);
80  } else {
82  if (!par->codec_id)
84  "unknown subformat:"FF_PRI_GUID"\n",
85  FF_ARG_GUID(subformat));
86  }
87 }
88 
89 /* "big_endian" values are needed for RIFX file format */
91  AVCodecParameters *par, int size, int big_endian)
92 {
93  int id;
94  uint64_t bitrate = 0;
95 
96  if (size < 14) {
97  avpriv_request_sample(s, "wav header size < 14");
98  return AVERROR_INVALIDDATA;
99  }
100 
102  if (!big_endian) {
103  id = avio_rl16(pb);
104  if (id != 0x0165) {
105  par->channels = avio_rl16(pb);
106  par->sample_rate = avio_rl32(pb);
107  bitrate = avio_rl32(pb) * 8LL;
108  par->block_align = avio_rl16(pb);
109  }
110  } else {
111  id = avio_rb16(pb);
112  par->channels = avio_rb16(pb);
113  par->sample_rate = avio_rb32(pb);
114  bitrate = avio_rb32(pb) * 8LL;
115  par->block_align = avio_rb16(pb);
116  }
117  if (size == 14) { /* We're dealing with plain vanilla WAVEFORMAT */
118  par->bits_per_coded_sample = 8;
119  } else {
120  if (!big_endian) {
121  par->bits_per_coded_sample = avio_rl16(pb);
122  } else {
123  par->bits_per_coded_sample = avio_rb16(pb);
124  }
125  }
126  if (id == 0xFFFE) {
127  par->codec_tag = 0;
128  } else {
129  par->codec_tag = id;
130  par->codec_id = ff_wav_codec_get_id(id,
131  par->bits_per_coded_sample);
132  }
133  if (size >= 18 && id != 0x0165) { /* We're obviously dealing with WAVEFORMATEX */
134  int cbSize = avio_rl16(pb); /* cbSize */
135  if (big_endian) {
136  avpriv_report_missing_feature(s, "WAVEFORMATEX support for RIFX files");
137  return AVERROR_PATCHWELCOME;
138  }
139  size -= 18;
140  cbSize = FFMIN(size, cbSize);
141  if (cbSize >= 22 && id == 0xfffe) { /* WAVEFORMATEXTENSIBLE */
142  parse_waveformatex(s, pb, par);
143  cbSize -= 22;
144  size -= 22;
145  }
146  if (cbSize > 0) {
147  if (ff_get_extradata(s, par, pb, cbSize) < 0)
148  return AVERROR(ENOMEM);
149  size -= cbSize;
150  }
151 
152  /* It is possible for the chunk to contain garbage at the end */
153  if (size > 0)
154  avio_skip(pb, size);
155  } else if (id == 0x0165 && size >= 32) {
156  int nb_streams, i;
157 
158  size -= 4;
159  if (ff_get_extradata(s, par, pb, size) < 0)
160  return AVERROR(ENOMEM);
161  nb_streams = AV_RL16(par->extradata + 4);
162  par->sample_rate = AV_RL32(par->extradata + 12);
163  par->channels = 0;
164  bitrate = 0;
165  if (size < 8 + nb_streams * 20)
166  return AVERROR_INVALIDDATA;
167  for (i = 0; i < nb_streams; i++)
168  par->channels += par->extradata[8 + i * 20 + 17];
169  }
170 
171  par->bit_rate = bitrate;
172 
173  if (par->sample_rate <= 0) {
175  "Invalid sample rate: %d\n", par->sample_rate);
176  return AVERROR_INVALIDDATA;
177  }
178  if (par->codec_id == AV_CODEC_ID_AAC_LATM) {
179  /* Channels and sample_rate values are those prior to applying SBR
180  * and/or PS. */
181  par->channels = 0;
182  par->sample_rate = 0;
183  }
184  /* override bits_per_coded_sample for G.726 */
185  if (par->codec_id == AV_CODEC_ID_ADPCM_G726 && par->sample_rate)
186  par->bits_per_coded_sample = par->bit_rate / par->sample_rate;
187 
188  return 0;
189 }
190 
191 enum AVCodecID ff_wav_codec_get_id(unsigned int tag, int bps)
192 {
193  enum AVCodecID id;
195  if (id <= 0)
196  return id;
197 
198  if (id == AV_CODEC_ID_PCM_S16LE)
199  id = ff_get_pcm_codec_id(bps, 0, 0, ~1);
200  else if (id == AV_CODEC_ID_PCM_F32LE)
201  id = ff_get_pcm_codec_id(bps, 1, 0, 0);
202 
203  if (id == AV_CODEC_ID_ADPCM_IMA_WAV && bps == 8)
205  return id;
206 }
207 
208 int ff_get_bmp_header(AVIOContext *pb, AVStream *st, uint32_t *size)
209 {
210  int tag1;
211  uint32_t size_ = avio_rl32(pb);
212  if (size)
213  *size = size_;
214  st->codecpar->width = avio_rl32(pb);
215  st->codecpar->height = (int32_t)avio_rl32(pb);
216  avio_rl16(pb); /* planes */
217  st->codecpar->bits_per_coded_sample = avio_rl16(pb); /* depth */
218  tag1 = avio_rl32(pb);
219  avio_rl32(pb); /* ImageSize */
220  avio_rl32(pb); /* XPelsPerMeter */
221  avio_rl32(pb); /* YPelsPerMeter */
222  avio_rl32(pb); /* ClrUsed */
223  avio_rl32(pb); /* ClrImportant */
224  return tag1;
225 }
226 
228 {
229  int64_t start, end, cur;
230  AVIOContext *pb = s->pb;
231 
232  start = avio_tell(pb);
233  end = start + size;
234 
235  while ((cur = avio_tell(pb)) >= 0 &&
236  cur <= end - 8 /* = tag + size */) {
237  uint32_t chunk_code;
238  int64_t chunk_size;
239  char key[5] = { 0 };
240  char *value;
241 
242  chunk_code = avio_rl32(pb);
243  chunk_size = avio_rl32(pb);
244  if (avio_feof(pb)) {
245  if (chunk_code || chunk_size) {
246  av_log(s, AV_LOG_WARNING, "INFO subchunk truncated\n");
247  return AVERROR_INVALIDDATA;
248  }
249  return AVERROR_EOF;
250  }
251  if (chunk_size > end ||
252  end - chunk_size < cur ||
253  chunk_size == UINT_MAX) {
254  avio_seek(pb, -9, SEEK_CUR);
255  chunk_code = avio_rl32(pb);
256  chunk_size = avio_rl32(pb);
257  if (chunk_size > end || end - chunk_size < cur || chunk_size == UINT_MAX) {
258  av_log(s, AV_LOG_WARNING, "too big INFO subchunk\n");
259  return AVERROR_INVALIDDATA;
260  }
261  }
262 
263  chunk_size += (chunk_size & 1);
264 
265  if (!chunk_code) {
266  if (chunk_size)
267  avio_skip(pb, chunk_size);
268  else if (pb->eof_reached) {
269  av_log(s, AV_LOG_WARNING, "truncated file\n");
270  return AVERROR_EOF;
271  }
272  continue;
273  }
274 
275  value = av_mallocz(chunk_size + 1);
276  if (!value) {
278  "out of memory, unable to read INFO tag\n");
279  return AVERROR(ENOMEM);
280  }
281 
282  AV_WL32(key, chunk_code);
283  // Work around VC++ 2015 Update 1 code-gen bug:
284  // https://connect.microsoft.com/VisualStudio/feedback/details/2291638
285  key[4] = 0;
286 
287  if (avio_read(pb, value, chunk_size) != chunk_size) {
289  "premature end of file while reading INFO tag\n");
290  }
291 
293  }
294 
295  return 0;
296 }
AV_CODEC_ID_PCM_S16LE
@ AV_CODEC_ID_PCM_S16LE
Definition: codec_id.h:314
AV_LOG_WARNING
#define AV_LOG_WARNING
Something somehow does not look correct.
Definition: log.h:186
ff_get_pcm_codec_id
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:368
AVCodecParameters::extradata
uint8_t * extradata
Extra binary data needed for initializing the decoder, codec-dependent.
Definition: codec_par.h:74
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
AVCodecParameters::codec_type
enum AVMediaType codec_type
General type of the encoded data.
Definition: codec_par.h:56
AV_WL32
#define AV_WL32(p, v)
Definition: intreadwrite.h:426
ff_get_extradata
int ff_get_extradata(AVFormatContext *s, AVCodecParameters *par, AVIOContext *pb, int size)
Allocate extradata with additional AV_INPUT_BUFFER_PADDING_SIZE at end which is always set to 0 and f...
Definition: utils.c:469
FF_AMBISONIC_BASE_GUID
#define FF_AMBISONIC_BASE_GUID
Definition: riff.h:116
AVCodecParameters
This struct describes the properties of an encoded stream.
Definition: codec_par.h:52
ff_wav_codec_get_id
enum AVCodecID ff_wav_codec_get_id(unsigned int tag, int bps)
Definition: riffdec.c:191
ff_get_guid
int ff_get_guid(AVIOContext *s, ff_asf_guid *g)
Definition: riffdec.c:31
AVERROR_EOF
#define AVERROR_EOF
End of file.
Definition: error.h:57
ff_get_bmp_header
int ff_get_bmp_header(AVIOContext *pb, AVStream *st, uint32_t *size)
Read BITMAPINFOHEADER structure and set AVStream codec width, height and bits_per_encoded_sample fiel...
Definition: riffdec.c:208
ff_codec_wav_tags
const AVCodecTag ff_codec_wav_tags[]
Definition: riff.c:509
AVCodecParameters::codec_tag
uint32_t codec_tag
Additional information about the codec (corresponds to the AVI FOURCC).
Definition: codec_par.h:64
ff_guidcmp
static av_always_inline int ff_guidcmp(const void *g1, const void *g2)
Definition: riff.h:121
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:504
avio_rl16
unsigned int avio_rl16(AVIOContext *s)
Definition: aviobuf.c:743
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:72
avassert.h
avio_rb32
unsigned int avio_rb32(AVIOContext *s)
Definition: aviobuf.c:790
AV_LOG_ERROR
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:180
FF_ARG_GUID
#define FF_ARG_GUID(g)
Definition: riff.h:108
AV_CODEC_ID_ADPCM_G726
@ AV_CODEC_ID_ADPCM_G726
Definition: codec_id.h:364
intreadwrite.h
s
#define s(width, name)
Definition: cbs_vp9.c:257
g
const char * g
Definition: vf_curves.c:117
AVMEDIA_TYPE_AUDIO
@ AVMEDIA_TYPE_AUDIO
Definition: avutil.h:202
AVCodecParameters::width
int width
Video only.
Definition: codec_par.h:126
av_assert0
#define av_assert0(cond)
assert() equivalent, that is always enabled.
Definition: avassert.h:37
AV_RL16
uint64_t_TMPL AV_WL64 unsigned int_TMPL AV_WL32 unsigned int_TMPL AV_WL24 unsigned int_TMPL AV_RL16
Definition: bytestream.h:94
nb_streams
static int nb_streams
Definition: ffprobe.c:297
key
const char * key
Definition: hwcontext_opencl.c:168
AVFormatContext
Format I/O context.
Definition: avformat.h:1200
AVStream::codecpar
AVCodecParameters * codecpar
Codec parameters associated with this stream.
Definition: avformat.h:1095
ff_asf_guid
uint8_t ff_asf_guid[16]
Definition: riff.h:95
AVERROR_PATCHWELCOME
#define AVERROR_PATCHWELCOME
Not yet implemented in FFmpeg, patches welcome.
Definition: error.h:64
ff_codec_guid_get_id
enum AVCodecID ff_codec_guid_get_id(const AVCodecGuid *guids, ff_asf_guid guid)
Definition: riffdec.c:43
AVCodecParameters::sample_rate
int sample_rate
Audio only.
Definition: codec_par.h:170
error.h
AVCodecID
AVCodecID
Identify the syntax and semantics of the bitstream.
Definition: codec_id.h:47
AV_CODEC_ID_ADPCM_ZORK
@ AV_CODEC_ID_ADPCM_ZORK
Definition: codec_id.h:397
avio_rl32
unsigned int avio_rl32(AVIOContext *s)
Definition: aviobuf.c:759
AVIOContext
Bytestream IO Context.
Definition: avio.h:161
id
enum AVCodecID id
Definition: extract_extradata_bsf.c:325
ff_codec_get_id
enum AVCodecID ff_codec_get_id(const AVCodecTag *tags, unsigned int tag)
Definition: utils.c:357
AVCodecGuid::id
enum AVCodecID id
Definition: riff.h:98
bps
unsigned bps
Definition: movenc.c:1597
size
int size
Definition: twinvq_data.h:10344
AVCodecGuid
Definition: riff.h:97
avpriv_report_missing_feature
void avpriv_report_missing_feature(void *avc, const char *msg,...) av_printf_format(2
Log a generic warning message about a missing feature.
ff_get_wav_header
int ff_get_wav_header(AVFormatContext *s, AVIOContext *pb, AVCodecParameters *par, int size, int big_endian)
Definition: riffdec.c:90
bitrate
int64_t bitrate
Definition: h264_levels.c:131
log.h
AV_CODEC_ID_NONE
@ AV_CODEC_ID_NONE
Definition: codec_id.h:48
i
#define i(width, name, range_min, range_max)
Definition: cbs_h2645.c:271
avio_internal.h
AVCodecParameters::height
int height
Definition: codec_par.h:127
AVCodecParameters::block_align
int block_align
Audio only.
Definition: codec_par.h:177
value
it s the only field you need to keep assuming you have a context There is some magic you don t need to care about around this just let it vf default value
Definition: writing_filters.txt:86
FFMIN
#define FFMIN(a, b)
Definition: macros.h:49
av_mallocz
void * av_mallocz(size_t size)
Allocate a memory block with alignment suitable for all memory accesses (including vectors if availab...
Definition: mem.c:263
tag
uint32_t tag
Definition: movenc.c:1596
ret
ret
Definition: filter_design.txt:187
AVStream
Stream structure.
Definition: avformat.h:935
avio_seek
int64_t avio_seek(AVIOContext *s, int64_t offset, int whence)
fseek() equivalent for AVIOContext.
Definition: aviobuf.c:260
avio_rb16
unsigned int avio_rb16(AVIOContext *s)
Definition: aviobuf.c:775
avformat.h
dict.h
AV_RL32
uint64_t_TMPL AV_WL64 unsigned int_TMPL AV_RL32
Definition: bytestream.h:92
parse_waveformatex
static void parse_waveformatex(AVFormatContext *s, AVIOContext *pb, AVCodecParameters *par)
Definition: riffdec.c:60
avio_read
int avio_read(AVIOContext *s, unsigned char *buf, int size)
Read size bytes from AVIOContext into buf.
Definition: aviobuf.c:641
AVIOContext::eof_reached
int eof_reached
true if was unable to read due to error or eof
Definition: avio.h:239
FF_MEDIASUBTYPE_BASE_GUID
#define FF_MEDIASUBTYPE_BASE_GUID
Definition: riff.h:114
avio_skip
int64_t avio_skip(AVIOContext *s, int64_t offset)
Skip given number of bytes forward.
Definition: aviobuf.c:347
AVCodecParameters::bits_per_coded_sample
int bits_per_coded_sample
The number of bits per sample in the codedwords.
Definition: codec_par.h:102
avpriv_request_sample
#define avpriv_request_sample(...)
Definition: tableprint_vlc.h:37
AVCodecParameters::codec_id
enum AVCodecID codec_id
Specific type of the encoded data (the codec used).
Definition: codec_par.h:60
AV_CODEC_ID_ADPCM_IMA_WAV
@ AV_CODEC_ID_ADPCM_IMA_WAV
Definition: codec_id.h:354
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
riff.h
AVCodecParameters::channel_layout
uint64_t channel_layout
Audio only.
Definition: codec_par.h:162
ff_codec_wav_guids
const AVCodecGuid ff_codec_wav_guids[]
Definition: riff.c:632
int32_t
int32_t
Definition: audioconvert.c:56
AV_CODEC_ID_PCM_F32LE
@ AV_CODEC_ID_PCM_F32LE
Definition: codec_id.h:335
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
AV_CODEC_ID_AAC_LATM
@ AV_CODEC_ID_AAC_LATM
Definition: codec_id.h:472
AVERROR_INVALIDDATA
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition: error.h:61
ffio_read_size
int ffio_read_size(AVIOContext *s, unsigned char *buf, int size)
Read size bytes from AVIOContext into buf.
Definition: aviobuf.c:691
FF_BROKEN_BASE_GUID
#define FF_BROKEN_BASE_GUID
Definition: riff.h:118
ff_read_riff_info
int ff_read_riff_info(AVFormatContext *s, int64_t size)
Definition: riffdec.c:227
FF_PRI_GUID
#define FF_PRI_GUID
Definition: riff.h:104
avio_feof
int avio_feof(AVIOContext *s)
Similar to feof() but also returns nonzero on read errors.
Definition: aviobuf.c:375