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/dict.h"
23 #include "libavutil/error.h"
24 #include "libavutil/log.h"
25 #include "libavutil/mathematics.h"
26 #include "libavcodec/avcodec.h"
27 #include "libavcodec/bytestream.h"
28 #include "avformat.h"
29 #include "avio_internal.h"
30 #include "riff.h"
31 
33 {
34  int ret;
35  av_assert0(sizeof(*g) == 16); //compiler will optimize this out
36  ret = avio_read(s, *g, sizeof(*g));
37  if (ret < (int)sizeof(*g)) {
38  memset(*g, 0, sizeof(*g));
39  return ret < 0 ? ret : AVERROR_INVALIDDATA;
40  }
41  return 0;
42 }
43 
45 {
46  int i;
47  for (i = 0; guids[i].id != AV_CODEC_ID_NONE; i++)
48  if (!ff_guidcmp(guids[i].guid, guid))
49  return guids[i].id;
50  return AV_CODEC_ID_NONE;
51 }
52 
53 /* We could be given one of the three possible structures here:
54  * WAVEFORMAT, PCMWAVEFORMAT or WAVEFORMATEX. Each structure
55  * is an expansion of the previous one with the fields added
56  * at the bottom. PCMWAVEFORMAT adds 'WORD wBitsPerSample' and
57  * WAVEFORMATEX adds 'WORD cbSize' and basically makes itself
58  * an openended structure.
59  */
60 
62 {
63  ff_asf_guid subformat;
64  int bps;
65 
66  bps = avio_rl16(pb);
67  if (bps)
69  par->channel_layout = avio_rl32(pb); /* dwChannelMask */
70 
71  ff_get_guid(pb, &subformat);
72  if (!memcmp(subformat + 4,
73  (const uint8_t[]){ FF_AMBISONIC_BASE_GUID }, 12) ||
74  !memcmp(subformat + 4,
75  (const uint8_t[]){ FF_BROKEN_BASE_GUID }, 12) ||
76  !memcmp(subformat + 4,
77  (const uint8_t[]){ FF_MEDIASUBTYPE_BASE_GUID }, 12)) {
78  par->codec_tag = AV_RL32(subformat);
81  } else {
83  if (!par->codec_id)
85  "unknown subformat:"FF_PRI_GUID"\n",
86  FF_ARG_GUID(subformat));
87  }
88 }
89 
90 /* "big_endian" values are needed for RIFX file format */
92  AVCodecParameters *par, int size, int big_endian)
93 {
94  int id;
95  uint64_t bitrate = 0;
96 
97  if (size < 14) {
98  avpriv_request_sample(s, "wav header size < 14");
99  return AVERROR_INVALIDDATA;
100  }
101 
103  if (!big_endian) {
104  id = avio_rl16(pb);
105  if (id != 0x0165) {
106  par->channels = avio_rl16(pb);
107  par->sample_rate = avio_rl32(pb);
108  bitrate = avio_rl32(pb) * 8LL;
109  par->block_align = avio_rl16(pb);
110  }
111  } else {
112  id = avio_rb16(pb);
113  par->channels = avio_rb16(pb);
114  par->sample_rate = avio_rb32(pb);
115  bitrate = avio_rb32(pb) * 8LL;
116  par->block_align = avio_rb16(pb);
117  }
118  if (size == 14) { /* We're dealing with plain vanilla WAVEFORMAT */
119  par->bits_per_coded_sample = 8;
120  } else {
121  if (!big_endian) {
122  par->bits_per_coded_sample = avio_rl16(pb);
123  } else {
124  par->bits_per_coded_sample = avio_rb16(pb);
125  }
126  }
127  if (id == 0xFFFE) {
128  par->codec_tag = 0;
129  } else {
130  par->codec_tag = id;
131  par->codec_id = ff_wav_codec_get_id(id,
132  par->bits_per_coded_sample);
133  }
134  if (size >= 18 && id != 0x0165) { /* We're obviously dealing with WAVEFORMATEX */
135  int cbSize = avio_rl16(pb); /* cbSize */
136  if (big_endian) {
137  avpriv_report_missing_feature(s, "WAVEFORMATEX support for RIFX files");
138  return AVERROR_PATCHWELCOME;
139  }
140  size -= 18;
141  cbSize = FFMIN(size, cbSize);
142  if (cbSize >= 22 && id == 0xfffe) { /* WAVEFORMATEXTENSIBLE */
143  parse_waveformatex(s, pb, par);
144  cbSize -= 22;
145  size -= 22;
146  }
147  if (cbSize > 0) {
148  if (ff_get_extradata(s, par, pb, cbSize) < 0)
149  return AVERROR(ENOMEM);
150  size -= cbSize;
151  }
152 
153  /* It is possible for the chunk to contain garbage at the end */
154  if (size > 0)
155  avio_skip(pb, size);
156  } else if (id == 0x0165 && size >= 32) {
157  int nb_streams, i;
158 
159  size -= 4;
160  if (ff_get_extradata(s, par, pb, size) < 0)
161  return AVERROR(ENOMEM);
162  nb_streams = AV_RL16(par->extradata + 4);
163  par->sample_rate = AV_RL32(par->extradata + 12);
164  par->channels = 0;
165  bitrate = 0;
166  if (size < 8 + nb_streams * 20)
167  return AVERROR_INVALIDDATA;
168  for (i = 0; i < nb_streams; i++)
169  par->channels += par->extradata[8 + i * 20 + 17];
170  }
171 
172  par->bit_rate = bitrate;
173 
174  if (par->sample_rate <= 0) {
176  "Invalid sample rate: %d\n", par->sample_rate);
177  return AVERROR_INVALIDDATA;
178  }
179  if (par->codec_id == AV_CODEC_ID_AAC_LATM) {
180  /* Channels and sample_rate values are those prior to applying SBR
181  * and/or PS. */
182  par->channels = 0;
183  par->sample_rate = 0;
184  }
185  /* override bits_per_coded_sample for G.726 */
186  if (par->codec_id == AV_CODEC_ID_ADPCM_G726 && par->sample_rate)
187  par->bits_per_coded_sample = par->bit_rate / par->sample_rate;
188 
189  return 0;
190 }
191 
192 enum AVCodecID ff_wav_codec_get_id(unsigned int tag, int bps)
193 {
194  enum AVCodecID id;
196  if (id <= 0)
197  return id;
198 
199  if (id == AV_CODEC_ID_PCM_S16LE)
200  id = ff_get_pcm_codec_id(bps, 0, 0, ~1);
201  else if (id == AV_CODEC_ID_PCM_F32LE)
202  id = ff_get_pcm_codec_id(bps, 1, 0, 0);
203 
204  if (id == AV_CODEC_ID_ADPCM_IMA_WAV && bps == 8)
206  return id;
207 }
208 
209 int ff_get_bmp_header(AVIOContext *pb, AVStream *st, uint32_t *size)
210 {
211  int tag1;
212  uint32_t size_ = avio_rl32(pb);
213  if (size)
214  *size = size_;
215  st->codecpar->width = avio_rl32(pb);
216  st->codecpar->height = (int32_t)avio_rl32(pb);
217  avio_rl16(pb); /* planes */
218  st->codecpar->bits_per_coded_sample = avio_rl16(pb); /* depth */
219  tag1 = avio_rl32(pb);
220  avio_rl32(pb); /* ImageSize */
221  avio_rl32(pb); /* XPelsPerMeter */
222  avio_rl32(pb); /* YPelsPerMeter */
223  avio_rl32(pb); /* ClrUsed */
224  avio_rl32(pb); /* ClrImportant */
225  return tag1;
226 }
227 
229 {
230  int64_t start, end, cur;
231  AVIOContext *pb = s->pb;
232 
233  start = avio_tell(pb);
234  end = start + size;
235 
236  while ((cur = avio_tell(pb)) >= 0 &&
237  cur <= end - 8 /* = tag + size */) {
238  uint32_t chunk_code;
239  int64_t chunk_size;
240  char key[5] = { 0 };
241  char *value;
242 
243  chunk_code = avio_rl32(pb);
244  chunk_size = avio_rl32(pb);
245  if (avio_feof(pb)) {
246  if (chunk_code || chunk_size) {
247  av_log(s, AV_LOG_WARNING, "INFO subchunk truncated\n");
248  return AVERROR_INVALIDDATA;
249  }
250  return AVERROR_EOF;
251  }
252  if (chunk_size > end ||
253  end - chunk_size < cur ||
254  chunk_size == UINT_MAX) {
255  avio_seek(pb, -9, SEEK_CUR);
256  chunk_code = avio_rl32(pb);
257  chunk_size = avio_rl32(pb);
258  if (chunk_size > end || end - chunk_size < cur || chunk_size == UINT_MAX) {
259  av_log(s, AV_LOG_WARNING, "too big INFO subchunk\n");
260  return AVERROR_INVALIDDATA;
261  }
262  }
263 
264  chunk_size += (chunk_size & 1);
265 
266  if (!chunk_code) {
267  if (chunk_size)
268  avio_skip(pb, chunk_size);
269  else if (pb->eof_reached) {
270  av_log(s, AV_LOG_WARNING, "truncated file\n");
271  return AVERROR_EOF;
272  }
273  continue;
274  }
275 
276  value = av_mallocz(chunk_size + 1);
277  if (!value) {
279  "out of memory, unable to read INFO tag\n");
280  return AVERROR(ENOMEM);
281  }
282 
283  AV_WL32(key, chunk_code);
284  // Work around VC++ 2015 Update 1 code-gen bug:
285  // https://connect.microsoft.com/VisualStudio/feedback/details/2291638
286  key[4] = 0;
287 
288  if (avio_read(pb, value, chunk_size) != chunk_size) {
290  "premature end of file while reading INFO tag\n");
291  }
292 
294  }
295 
296  return 0;
297 }
AV_CODEC_ID_PCM_S16LE
@ AV_CODEC_ID_PCM_S16LE
Definition: codec_id.h:312
AV_LOG_WARNING
#define AV_LOG_WARNING
Something somehow does not look correct.
Definition: log.h:187
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:3090
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:3279
FF_AMBISONIC_BASE_GUID
#define FF_AMBISONIC_BASE_GUID
Definition: riff.h:117
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:192
ff_get_guid
int ff_get_guid(AVIOContext *s, ff_asf_guid *g)
Definition: riffdec.c:32
AVERROR_EOF
#define AVERROR_EOF
End of file.
Definition: error.h:55
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:209
ff_codec_wav_tags
const AVCodecTag ff_codec_wav_tags[]
Definition: riff.c:508
AVCodecParameters::codec_tag
uint32_t codec_tag
Additional information about the codec (corresponds to the AVI FOURCC).
Definition: codec_par.h:64
mathematics.h
ff_guidcmp
static av_always_inline int ff_guidcmp(const void *g1, const void *g2)
Definition: riff.h:122
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:557
avio_rl16
unsigned int avio_rl16(AVIOContext *s)
Definition: aviobuf.c:717
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
AV_LOG_ERROR
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:181
FF_ARG_GUID
#define FF_ARG_GUID(g)
Definition: riff.h:109
AV_CODEC_ID_ADPCM_G726
@ AV_CODEC_ID_ADPCM_G726
Definition: codec_id.h:362
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:288
key
const char * key
Definition: hwcontext_opencl.c:168
AVFormatContext
Format I/O context.
Definition: avformat.h:1106
AVStream::codecpar
AVCodecParameters * codecpar
Codec parameters associated with this stream.
Definition: avformat.h:979
ff_asf_guid
uint8_t ff_asf_guid[16]
Definition: riff.h:96
AVERROR_PATCHWELCOME
#define AVERROR_PATCHWELCOME
Not yet implemented in FFmpeg, patches welcome.
Definition: error.h:62
ff_codec_guid_get_id
enum AVCodecID ff_codec_guid_get_id(const AVCodecGuid *guids, ff_asf_guid guid)
Definition: riffdec.c:44
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:46
AV_CODEC_ID_ADPCM_ZORK
@ AV_CODEC_ID_ADPCM_ZORK
Definition: codec_id.h:395
avio_rl32
unsigned int avio_rl32(AVIOContext *s)
Definition: aviobuf.c:733
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:3078
AVCodecGuid::id
enum AVCodecID id
Definition: riff.h:99
bps
unsigned bps
Definition: movenc.c:1595
size
int size
Definition: twinvq_data.h:10344
AVCodecGuid
Definition: riff.h:98
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:91
FFMIN
#define FFMIN(a, b)
Definition: common.h:105
bitrate
int64_t bitrate
Definition: h264_levels.c:131
i
int i
Definition: input.c:407
log.h
AV_CODEC_ID_NONE
@ AV_CODEC_ID_NONE
Definition: codec_id.h:47
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
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:243
avcodec.h
tag
uint32_t tag
Definition: movenc.c:1594
ret
ret
Definition: filter_design.txt:187
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
avio_rb16
unsigned int avio_rb16(AVIOContext *s)
Definition: aviobuf.c:749
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:61
avio_read
int avio_read(AVIOContext *s, unsigned char *buf, int size)
Read size bytes from AVIOContext into buf.
Definition: aviobuf.c:616
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:115
avio_skip
int64_t avio_skip(AVIOContext *s, int64_t offset)
Skip given number of bytes forward.
Definition: aviobuf.c:327
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:39
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:352
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:630
int32_t
int32_t
Definition: audioconvert.c:56
bytestream.h
AV_CODEC_ID_PCM_F32LE
@ AV_CODEC_ID_PCM_F32LE
Definition: codec_id.h:333
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:470
AVERROR_INVALIDDATA
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition: error.h:59
FF_BROKEN_BASE_GUID
#define FF_BROKEN_BASE_GUID
Definition: riff.h:119
ff_read_riff_info
int ff_read_riff_info(AVFormatContext *s, int64_t size)
Definition: riffdec.c:228
FF_PRI_GUID
#define FF_PRI_GUID
Definition: riff.h:105
avio_feof
int avio_feof(AVIOContext *s)
Similar to feof() but also returns nonzero on read errors.
Definition: aviobuf.c:354