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;
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  if (!big_endian) {
107  id = avio_rl16(pb);
108  if (id != 0x0165) {
109  channels = avio_rl16(pb);
110  par->sample_rate = avio_rl32(pb);
111  bitrate = avio_rl32(pb) * 8LL;
112  par->block_align = avio_rl16(pb);
113  }
114  } else {
115  id = avio_rb16(pb);
116  channels = avio_rb16(pb);
117  par->sample_rate = avio_rb32(pb);
118  bitrate = avio_rb32(pb) * 8LL;
119  par->block_align = avio_rb16(pb);
120  }
121  if (size == 14) { /* We're dealing with plain vanilla WAVEFORMAT */
122  par->bits_per_coded_sample = 8;
123  } else {
124  if (!big_endian) {
125  par->bits_per_coded_sample = avio_rl16(pb);
126  } else {
127  par->bits_per_coded_sample = avio_rb16(pb);
128  }
129  }
130  if (id == 0xFFFE) {
131  par->codec_tag = 0;
132  } else {
133  par->codec_tag = id;
134  par->codec_id = ff_wav_codec_get_id(id,
135  par->bits_per_coded_sample);
136  }
137  if (size >= 18 && id != 0x0165) { /* We're obviously dealing with WAVEFORMATEX */
138  int cbSize = avio_rl16(pb); /* cbSize */
139  if (big_endian) {
140  avpriv_report_missing_feature(s, "WAVEFORMATEX support for RIFX files");
141  return AVERROR_PATCHWELCOME;
142  }
143  size -= 18;
144  cbSize = FFMIN(size, cbSize);
145  if (cbSize >= 22 && id == 0xfffe) { /* WAVEFORMATEXTENSIBLE */
146  parse_waveformatex(s, pb, par);
147  cbSize -= 22;
148  size -= 22;
149  }
150  if (cbSize > 0) {
151  if (ff_get_extradata(s, par, pb, cbSize) < 0)
152  return AVERROR(ENOMEM);
153  size -= cbSize;
154  }
155 
156  /* It is possible for the chunk to contain garbage at the end */
157  if (size > 0)
158  avio_skip(pb, size);
159  } else if (id == 0x0165 && size >= 32) {
160  int nb_streams, i;
161 
162  size -= 4;
163  if (ff_get_extradata(s, par, pb, size) < 0)
164  return AVERROR(ENOMEM);
165  nb_streams = AV_RL16(par->extradata + 4);
166  par->sample_rate = AV_RL32(par->extradata + 12);
167  channels = 0;
168  bitrate = 0;
169  if (size < 8 + nb_streams * 20)
170  return AVERROR_INVALIDDATA;
171  for (i = 0; i < nb_streams; i++)
172  channels += par->extradata[8 + i * 20 + 17];
173  }
174 
175  par->bit_rate = bitrate;
176 
177  if (par->sample_rate <= 0) {
179  "Invalid sample rate: %d\n", par->sample_rate);
180  return AVERROR_INVALIDDATA;
181  }
182  if (par->codec_id == AV_CODEC_ID_AAC_LATM) {
183  /* Channels and sample_rate values are those prior to applying SBR
184  * and/or PS. */
185  channels = 0;
186  par->sample_rate = 0;
187  }
188  /* override bits_per_coded_sample for G.726 */
189  if (par->codec_id == AV_CODEC_ID_ADPCM_G726 && par->sample_rate)
190  par->bits_per_coded_sample = par->bit_rate / par->sample_rate;
191 
195 
196  return 0;
197 }
198 
199 enum AVCodecID ff_wav_codec_get_id(unsigned int tag, int bps)
200 {
201  enum AVCodecID id;
203  if (id <= 0)
204  return id;
205 
206  if (id == AV_CODEC_ID_PCM_S16LE)
207  id = ff_get_pcm_codec_id(bps, 0, 0, ~1);
208  else if (id == AV_CODEC_ID_PCM_F32LE)
209  id = ff_get_pcm_codec_id(bps, 1, 0, 0);
210 
211  if (id == AV_CODEC_ID_ADPCM_IMA_WAV && bps == 8)
213  return id;
214 }
215 
216 int ff_get_bmp_header(AVIOContext *pb, AVStream *st, uint32_t *size)
217 {
218  int tag1;
219  uint32_t size_ = avio_rl32(pb);
220  if (size)
221  *size = size_;
222  st->codecpar->width = avio_rl32(pb);
223  st->codecpar->height = (int32_t)avio_rl32(pb);
224  avio_rl16(pb); /* planes */
225  st->codecpar->bits_per_coded_sample = avio_rl16(pb); /* depth */
226  tag1 = avio_rl32(pb);
227  avio_rl32(pb); /* ImageSize */
228  avio_rl32(pb); /* XPelsPerMeter */
229  avio_rl32(pb); /* YPelsPerMeter */
230  avio_rl32(pb); /* ClrUsed */
231  avio_rl32(pb); /* ClrImportant */
232  return tag1;
233 }
234 
236 {
237  int64_t start, end, cur;
238  AVIOContext *pb = s->pb;
239 
240  start = avio_tell(pb);
241  end = start + size;
242 
243  while ((cur = avio_tell(pb)) >= 0 &&
244  cur <= end - 8 /* = tag + size */) {
245  uint32_t chunk_code;
246  int64_t chunk_size;
247  char key[5] = { 0 };
248  char *value;
249 
250  chunk_code = avio_rl32(pb);
251  chunk_size = avio_rl32(pb);
252  if (avio_feof(pb)) {
253  if (chunk_code || chunk_size) {
254  av_log(s, AV_LOG_WARNING, "INFO subchunk truncated\n");
255  return AVERROR_INVALIDDATA;
256  }
257  return AVERROR_EOF;
258  }
259  if (chunk_size > end ||
260  end - chunk_size < cur ||
261  chunk_size == UINT_MAX) {
262  avio_seek(pb, -9, SEEK_CUR);
263  chunk_code = avio_rl32(pb);
264  chunk_size = avio_rl32(pb);
265  if (chunk_size > end || end - chunk_size < cur || chunk_size == UINT_MAX) {
266  av_log(s, AV_LOG_WARNING, "too big INFO subchunk\n");
267  return AVERROR_INVALIDDATA;
268  }
269  }
270 
271  chunk_size += (chunk_size & 1);
272 
273  if (!chunk_code) {
274  if (chunk_size)
275  avio_skip(pb, chunk_size);
276  else if (pb->eof_reached) {
277  av_log(s, AV_LOG_WARNING, "truncated file\n");
278  return AVERROR_EOF;
279  }
280  continue;
281  }
282 
283  value = av_mallocz(chunk_size + 1);
284  if (!value) {
286  "out of memory, unable to read INFO tag\n");
287  return AVERROR(ENOMEM);
288  }
289 
290  AV_WL32(key, chunk_code);
291  // Work around VC++ 2015 Update 1 code-gen bug:
292  // https://connect.microsoft.com/VisualStudio/feedback/details/2291638
293  key[4] = 0;
294 
295  if (avio_read(pb, value, chunk_size) != chunk_size) {
297  "premature end of file while reading INFO tag\n");
298  }
299 
301  }
302 
303  return 0;
304 }
AV_CODEC_ID_PCM_S16LE
@ AV_CODEC_ID_PCM_S16LE
Definition: codec_id.h:320
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:75
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:57
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:53
ff_wav_codec_get_id
enum AVCodecID ff_wav_codec_get_id(unsigned int tag, int bps)
Definition: riffdec.c:199
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:216
ff_codec_wav_tags
const AVCodecTag ff_codec_wav_tags[]
Definition: riff.c:511
AVCodecParameters::codec_tag
uint32_t codec_tag
Additional information about the codec (corresponds to the AVI FOURCC).
Definition: codec_par.h:65
AVChannelLayout::order
enum AVChannelOrder order
Channel order used in this layout.
Definition: channel_layout.h:295
AVChannelLayout::nb_channels
int nb_channels
Number of channels in this layout.
Definition: channel_layout.h:300
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:505
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
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:370
intreadwrite.h
s
#define s(width, name)
Definition: cbs_vp9.c:256
g
const char * g
Definition: vf_curves.c:117
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:106
AVMEDIA_TYPE_AUDIO
@ AVMEDIA_TYPE_AUDIO
Definition: avutil.h:202
AVCodecParameters::width
int width
Video only.
Definition: codec_par.h:127
av_assert0
#define av_assert0(cond)
assert() equivalent, that is always enabled.
Definition: avassert.h:37
channels
channels
Definition: aptx.h:32
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:307
key
const char * key
Definition: hwcontext_opencl.c:174
AVFormatContext
Format I/O context.
Definition: avformat.h:1213
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:212
AVCodecParameters::sample_rate
int sample_rate
Audio only.
Definition: codec_par.h:177
error.h
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:630
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:403
avio_rl32
unsigned int avio_rl32(AVIOContext *s)
Definition: aviobuf.c:759
AVIOContext
Bytestream IO Context.
Definition: avio.h:162
id
enum AVCodecID id
Definition: extract_extradata_bsf.c:324
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:1647
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:48
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:128
AVCodecParameters::block_align
int block_align
Audio only.
Definition: codec_par.h:184
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
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:389
tag
uint32_t tag
Definition: movenc.c:1646
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: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:61
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:240
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:103
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:61
AV_CODEC_ID_ADPCM_IMA_WAV
@ AV_CODEC_ID_ADPCM_IMA_WAV
Definition: codec_id.h:360
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
ff_codec_wav_guids
const AVCodecGuid ff_codec_wav_guids[]
Definition: riff.c:636
int32_t
int32_t
Definition: audioconvert.c:56
AV_CODEC_ID_PCM_F32LE
@ AV_CODEC_ID_PCM_F32LE
Definition: codec_id.h:341
AVCodecParameters::bit_rate
int64_t bit_rate
The average bitrate of the encoded data (in bits per second).
Definition: codec_par.h:90
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:478
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:235
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