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 "demux.h"
30 #include "riff.h"
31 
33 {
34  int ret;
35  av_assert0(sizeof(*g) == 16); //compiler will optimize this out
36  ret = ffio_read_size(s, *g, sizeof(*g));
37  if (ret < 0) {
38  memset(*g, 0, sizeof(*g));
39  return ret;
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  uint64_t mask;
66 
67  bps = avio_rl16(pb);
68  if (bps)
70 
71  mask = avio_rl32(pb); /* dwChannelMask */
73 
74  ff_get_guid(pb, &subformat);
75  if (!memcmp(subformat + 4,
76  (const uint8_t[]){ FF_AMBISONIC_BASE_GUID }, 12) ||
77  !memcmp(subformat + 4,
78  (const uint8_t[]){ FF_BROKEN_BASE_GUID }, 12) ||
79  !memcmp(subformat + 4,
80  (const uint8_t[]){ FF_MEDIASUBTYPE_BASE_GUID }, 12)) {
81  par->codec_tag = AV_RL32(subformat);
84  } else {
86  if (!par->codec_id)
88  "unknown subformat:"FF_PRI_GUID"\n",
89  FF_ARG_GUID(subformat));
90  }
91 }
92 
93 /* "big_endian" values are needed for RIFX file format */
95  AVCodecParameters *par, int size, int big_endian)
96 {
97  int id, channels = 0;
98  uint64_t bitrate = 0;
99 
100  if (size < 14) {
101  avpriv_request_sample(s, "wav header size < 14");
102  return AVERROR_INVALIDDATA;
103  }
104 
106 
108  if (!big_endian) {
109  id = avio_rl16(pb);
110  if (id != 0x0165) {
111  channels = avio_rl16(pb);
112  par->sample_rate = avio_rl32(pb);
113  bitrate = avio_rl32(pb) * 8LL;
114  par->block_align = avio_rl16(pb);
115  }
116  } else {
117  id = avio_rb16(pb);
118  channels = avio_rb16(pb);
119  par->sample_rate = avio_rb32(pb);
120  bitrate = avio_rb32(pb) * 8LL;
121  par->block_align = avio_rb16(pb);
122  }
123  if (size == 14) { /* We're dealing with plain vanilla WAVEFORMAT */
124  par->bits_per_coded_sample = 8;
125  } else {
126  if (!big_endian) {
127  par->bits_per_coded_sample = avio_rl16(pb);
128  } else {
129  par->bits_per_coded_sample = avio_rb16(pb);
130  }
131  }
132  if (id == 0xFFFE) {
133  par->codec_tag = 0;
134  } else {
135  par->codec_tag = id;
136  par->codec_id = ff_wav_codec_get_id(id,
137  par->bits_per_coded_sample);
138  }
139  if (size >= 18 && id != 0x0165) { /* We're obviously dealing with WAVEFORMATEX */
140  int cbSize = avio_rl16(pb); /* cbSize */
141  if (big_endian) {
142  avpriv_report_missing_feature(s, "WAVEFORMATEX support for RIFX files");
143  return AVERROR_PATCHWELCOME;
144  }
145  size -= 18;
146  cbSize = FFMIN(size, cbSize);
147  if (cbSize >= 22 && id == 0xfffe) { /* WAVEFORMATEXTENSIBLE */
148  parse_waveformatex(s, pb, par);
149  cbSize -= 22;
150  size -= 22;
151  }
152  if (cbSize > 0) {
153  if (ff_get_extradata(s, par, pb, cbSize) < 0)
154  return AVERROR(ENOMEM);
155  size -= cbSize;
156  }
157 
158  /* It is possible for the chunk to contain garbage at the end */
159  if (size > 0)
160  avio_skip(pb, size);
161  } else if (id == 0x0165 && size >= 32) {
162  int nb_streams, i;
163 
164  size -= 4;
165  if (ff_get_extradata(s, par, pb, size) < 0)
166  return AVERROR(ENOMEM);
167  nb_streams = AV_RL16(par->extradata + 4);
168  par->sample_rate = AV_RL32(par->extradata + 12);
169  channels = 0;
170  bitrate = 0;
171  if (size < 8 + nb_streams * 20)
172  return AVERROR_INVALIDDATA;
173  for (i = 0; i < nb_streams; i++)
174  channels += par->extradata[8 + i * 20 + 17];
175  }
176 
177  par->bit_rate = bitrate;
178 
179  if (par->sample_rate <= 0) {
181  "Invalid sample rate: %d\n", par->sample_rate);
182  return AVERROR_INVALIDDATA;
183  }
184  if (par->codec_id == AV_CODEC_ID_AAC_LATM) {
185  /* Channels and sample_rate values are those prior to applying SBR
186  * and/or PS. */
187  channels = 0;
188  par->sample_rate = 0;
189  }
190  /* override bits_per_coded_sample for G.726 */
191  if (par->codec_id == AV_CODEC_ID_ADPCM_G726 && par->sample_rate)
192  par->bits_per_coded_sample = par->bit_rate / par->sample_rate;
193 
194  /* ignore WAVEFORMATEXTENSIBLE layout if different from channel count */
195  if (channels != par->ch_layout.nb_channels) {
199  }
200 
201  return 0;
202 }
203 
204 enum AVCodecID ff_wav_codec_get_id(unsigned int tag, int bps)
205 {
206  enum AVCodecID id;
208  if (id <= 0)
209  return id;
210 
211  if (id == AV_CODEC_ID_PCM_S16LE)
212  id = ff_get_pcm_codec_id(bps, 0, 0, ~1);
213  else if (id == AV_CODEC_ID_PCM_F32LE)
214  id = ff_get_pcm_codec_id(bps, 1, 0, 0);
215 
216  if (id == AV_CODEC_ID_ADPCM_IMA_WAV && bps == 8)
218  return id;
219 }
220 
221 int ff_get_bmp_header(AVIOContext *pb, AVStream *st, uint32_t *size)
222 {
223  int tag1;
224  uint32_t size_ = avio_rl32(pb);
225  if (size)
226  *size = size_;
227  st->codecpar->width = avio_rl32(pb);
228  st->codecpar->height = (int32_t)avio_rl32(pb);
229  avio_rl16(pb); /* planes */
230  st->codecpar->bits_per_coded_sample = avio_rl16(pb); /* depth */
231  tag1 = avio_rl32(pb);
232  avio_rl32(pb); /* ImageSize */
233  avio_rl32(pb); /* XPelsPerMeter */
234  avio_rl32(pb); /* YPelsPerMeter */
235  avio_rl32(pb); /* ClrUsed */
236  avio_rl32(pb); /* ClrImportant */
237  return tag1;
238 }
239 
241 {
242  int64_t start, end, cur;
243  AVIOContext *pb = s->pb;
244 
245  start = avio_tell(pb);
246  end = start + size;
247 
248  while ((cur = avio_tell(pb)) >= 0 &&
249  cur <= end - 8 /* = tag + size */) {
250  uint32_t chunk_code;
251  int64_t chunk_size;
252  char key[5] = { 0 };
253  char *value;
254 
255  chunk_code = avio_rl32(pb);
256  chunk_size = avio_rl32(pb);
257  if (avio_feof(pb)) {
258  if (chunk_code || chunk_size) {
259  av_log(s, AV_LOG_WARNING, "INFO subchunk truncated\n");
260  return AVERROR_INVALIDDATA;
261  }
262  return AVERROR_EOF;
263  }
264  if (chunk_size > end ||
265  end - chunk_size < cur ||
266  chunk_size == UINT_MAX) {
267  avio_seek(pb, -9, SEEK_CUR);
268  chunk_code = avio_rl32(pb);
269  chunk_size = avio_rl32(pb);
270  if (chunk_size > end || end - chunk_size < cur || chunk_size == UINT_MAX) {
271  av_log(s, AV_LOG_WARNING, "too big INFO subchunk\n");
272  return AVERROR_INVALIDDATA;
273  }
274  }
275 
276  chunk_size += (chunk_size & 1);
277 
278  if (!chunk_code) {
279  if (chunk_size)
280  avio_skip(pb, chunk_size);
281  else if (pb->eof_reached) {
282  av_log(s, AV_LOG_WARNING, "truncated file\n");
283  return AVERROR_EOF;
284  }
285  continue;
286  }
287 
288  value = av_mallocz(chunk_size + 1);
289  if (!value) {
291  "out of memory, unable to read INFO tag\n");
292  return AVERROR(ENOMEM);
293  }
294 
295  AV_WL32(key, chunk_code);
296  // Work around VC++ 2015 Update 1 code-gen bug:
297  // https://connect.microsoft.com/VisualStudio/feedback/details/2291638
298  key[4] = 0;
299 
300  if (avio_read(pb, value, chunk_size) != chunk_size) {
302  "premature end of file while reading INFO tag\n");
303  }
304 
306  }
307 
308  return 0;
309 }
AV_CODEC_ID_PCM_S16LE
@ AV_CODEC_ID_PCM_S16LE
Definition: codec_id.h:326
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:155
AVCodecParameters::extradata
uint8_t * extradata
Extra binary data needed for initializing the decoder, codec-dependent.
Definition: codec_par.h:76
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:58
AV_WL32
#define AV_WL32(p, v)
Definition: intreadwrite.h:426
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:54
ff_wav_codec_get_id
enum AVCodecID ff_wav_codec_get_id(unsigned int tag, int bps)
Definition: riffdec.c:204
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: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:221
ff_codec_wav_tags
const AVCodecTag ff_codec_wav_tags[]
Definition: riff.c:513
AVCodecParameters::codec_tag
uint32_t codec_tag
Additional information about the codec (corresponds to the AVI FOURCC).
Definition: codec_par.h:66
AVChannelLayout::order
enum AVChannelOrder order
Channel order used in this layout.
Definition: channel_layout.h:306
AVChannelLayout::nb_channels
int nb_channels
Number of channels in this layout.
Definition: channel_layout.h:311
ff_get_extradata
int ff_get_extradata(void *logctx, 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: demux_utils.c:355
ff_guidcmp
static av_always_inline int ff_guidcmp(const void *g1, const void *g2)
Definition: riff.h:121
avio_tell
static av_always_inline int64_t avio_tell(AVIOContext *s)
ftell() equivalent for AVIOContext.
Definition: avio.h:510
avio_rl16
unsigned int avio_rl16(AVIOContext *s)
Definition: aviobuf.c:745
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:79
avassert.h
avio_rb32
unsigned int avio_rb32(AVIOContext *s)
Definition: aviobuf.c:792
AV_LOG_ERROR
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:180
mask
static const uint16_t mask[17]
Definition: lzw.c:38
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:376
intreadwrite.h
s
#define s(width, name)
Definition: cbs_vp9.c:256
g
const char * g
Definition: vf_curves.c:127
AVMEDIA_TYPE_AUDIO
@ AVMEDIA_TYPE_AUDIO
Definition: avutil.h:202
AVCodecParameters::width
int width
Video only.
Definition: codec_par.h:128
AV_CHANNEL_ORDER_UNSPEC
@ AV_CHANNEL_ORDER_UNSPEC
Only the channel count is specified, without any further information about the channel order.
Definition: channel_layout.h:112
av_channel_layout_from_mask
FF_ENABLE_DEPRECATION_WARNINGS int av_channel_layout_from_mask(AVChannelLayout *channel_layout, uint64_t mask)
Initialize a native channel layout from a bitmask indicating which channels are present.
Definition: channel_layout.c:391
av_assert0
#define av_assert0(cond)
assert() equivalent, that is always enabled.
Definition: avassert.h:37
channels
channels
Definition: aptx.h:31
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:308
key
const char * key
Definition: hwcontext_opencl.c:174
AVFormatContext
Format I/O context.
Definition: avformat.h:1216
AVStream::codecpar
AVCodecParameters * codecpar
Codec parameters associated with this stream.
Definition: avformat.h:1108
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:44
AVCodecParameters::ch_layout
AVChannelLayout ch_layout
Audio only.
Definition: codec_par.h:213
AVCodecParameters::sample_rate
int sample_rate
Audio only.
Definition: codec_par.h:178
error.h
AVCodecID
AVCodecID
Identify the syntax and semantics of the bitstream.
Definition: codec_id.h:49
AV_CODEC_ID_ADPCM_ZORK
@ AV_CODEC_ID_ADPCM_ZORK
Definition: codec_id.h:409
avio_rl32
unsigned int avio_rl32(AVIOContext *s)
Definition: aviobuf.c:761
AVIOContext
Bytestream IO Context.
Definition: avio.h:166
ff_codec_get_id
enum AVCodecID ff_codec_get_id(const AVCodecTag *tags, unsigned int tag)
Definition: utils.c:144
AVCodecGuid::id
enum AVCodecID id
Definition: riff.h:98
bps
unsigned bps
Definition: movenc.c:1648
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:94
bitrate
int64_t bitrate
Definition: h264_levels.c:131
log.h
AV_CODEC_ID_NONE
@ AV_CODEC_ID_NONE
Definition: codec_id.h:50
i
#define i(width, name, range_min, range_max)
Definition: cbs_h2645.c:269
avio_internal.h
AVCodecParameters::height
int height
Definition: codec_par.h:129
AVCodecParameters::block_align
int block_align
Audio only.
Definition: codec_par.h:185
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:264
demux.h
tag
uint32_t tag
Definition: movenc.c:1647
ret
ret
Definition: filter_design.txt:187
AVStream
Stream structure.
Definition: avformat.h:948
avio_seek
int64_t avio_seek(AVIOContext *s, int64_t offset, int whence)
fseek() equivalent for AVIOContext.
Definition: aviobuf.c:262
avio_rb16
unsigned int avio_rb16(AVIOContext *s)
Definition: aviobuf.c:777
avformat.h
dict.h
AV_RL32
uint64_t_TMPL AV_WL64 unsigned int_TMPL AV_RL32
Definition: bytestream.h:92
id
enum AVCodecID id
Definition: dts2pts_bsf.c:362
parse_waveformatex
static void parse_waveformatex(AVFormatContext *s, AVIOContext *pb, AVCodecParameters *par)
Definition: riffdec.c:61
av_channel_layout_uninit
void av_channel_layout_uninit(AVChannelLayout *channel_layout)
Free any allocated data in the channel layout and reset the channel count to 0.
Definition: channel_layout.c:632
avio_read
int avio_read(AVIOContext *s, unsigned char *buf, int size)
Read size bytes from AVIOContext into buf.
Definition: aviobuf.c:643
AVIOContext::eof_reached
int eof_reached
true if was unable to read due to error or eof
Definition: avio.h:244
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:349
AVCodecParameters::bits_per_coded_sample
int bits_per_coded_sample
The number of bits per sample in the codedwords.
Definition: codec_par.h:104
avpriv_request_sample
#define avpriv_request_sample(...)
Definition: tableprint_vlc.h:36
AVCodecParameters::codec_id
enum AVCodecID codec_id
Specific type of the encoded data (the codec used).
Definition: codec_par.h:62
AV_CODEC_ID_ADPCM_IMA_WAV
@ AV_CODEC_ID_ADPCM_IMA_WAV
Definition: codec_id.h:366
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:86
riff.h
ff_codec_wav_guids
const AVCodecGuid ff_codec_wav_guids[]
Definition: riff.c:643
int32_t
int32_t
Definition: audioconvert.c:56
AV_CODEC_ID_PCM_F32LE
@ AV_CODEC_ID_PCM_F32LE
Definition: codec_id.h:347
AVCodecParameters::bit_rate
int64_t bit_rate
The average bitrate of the encoded data (in bits per second).
Definition: codec_par.h:91
av_log
#define av_log(a,...)
Definition: tableprint_vlc.h:27
AV_CODEC_ID_AAC_LATM
@ AV_CODEC_ID_AAC_LATM
Definition: codec_id.h:484
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:693
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:240
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:377