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  av_freep(&par->extradata);
149  if (ff_get_extradata(s, par, pb, cbSize) < 0)
150  return AVERROR(ENOMEM);
151  size -= cbSize;
152  }
153 
154  /* It is possible for the chunk to contain garbage at the end */
155  if (size > 0)
156  avio_skip(pb, size);
157  } else if (id == 0x0165 && size >= 32) {
158  int nb_streams, i;
159 
160  size -= 4;
161  av_freep(&par->extradata);
162  if (ff_get_extradata(s, par, pb, size) < 0)
163  return AVERROR(ENOMEM);
164  nb_streams = AV_RL16(par->extradata + 4);
165  par->sample_rate = AV_RL32(par->extradata + 12);
166  par->channels = 0;
167  bitrate = 0;
168  if (size < 8 + nb_streams * 20)
169  return AVERROR_INVALIDDATA;
170  for (i = 0; i < nb_streams; i++)
171  par->channels += par->extradata[8 + i * 20 + 17];
172  }
173 
174  par->bit_rate = bitrate;
175 
176  if (par->sample_rate <= 0) {
177  av_log(s, AV_LOG_ERROR,
178  "Invalid sample rate: %d\n", par->sample_rate);
179  return AVERROR_INVALIDDATA;
180  }
181  if (par->codec_id == AV_CODEC_ID_AAC_LATM) {
182  /* Channels and sample_rate values are those prior to applying SBR
183  * and/or PS. */
184  par->channels = 0;
185  par->sample_rate = 0;
186  }
187  /* override bits_per_coded_sample for G.726 */
188  if (par->codec_id == AV_CODEC_ID_ADPCM_G726 && par->sample_rate)
189  par->bits_per_coded_sample = par->bit_rate / par->sample_rate;
190 
191  return 0;
192 }
193 
194 enum AVCodecID ff_wav_codec_get_id(unsigned int tag, int bps)
195 {
196  enum AVCodecID id;
198  if (id <= 0)
199  return id;
200 
201  if (id == AV_CODEC_ID_PCM_S16LE)
202  id = ff_get_pcm_codec_id(bps, 0, 0, ~1);
203  else if (id == AV_CODEC_ID_PCM_F32LE)
204  id = ff_get_pcm_codec_id(bps, 1, 0, 0);
205 
206  if (id == AV_CODEC_ID_ADPCM_IMA_WAV && bps == 8)
208  return id;
209 }
210 
211 int ff_get_bmp_header(AVIOContext *pb, AVStream *st, uint32_t *size)
212 {
213  int tag1;
214  uint32_t size_ = avio_rl32(pb);
215  if (size)
216  *size = size_;
217  st->codecpar->width = avio_rl32(pb);
218  st->codecpar->height = (int32_t)avio_rl32(pb);
219  avio_rl16(pb); /* planes */
220  st->codecpar->bits_per_coded_sample = avio_rl16(pb); /* depth */
221  tag1 = avio_rl32(pb);
222  avio_rl32(pb); /* ImageSize */
223  avio_rl32(pb); /* XPelsPerMeter */
224  avio_rl32(pb); /* YPelsPerMeter */
225  avio_rl32(pb); /* ClrUsed */
226  avio_rl32(pb); /* ClrImportant */
227  return tag1;
228 }
229 
231 {
232  int64_t start, end, cur;
233  AVIOContext *pb = s->pb;
234 
235  start = avio_tell(pb);
236  end = start + size;
237 
238  while ((cur = avio_tell(pb)) >= 0 &&
239  cur <= end - 8 /* = tag + size */) {
240  uint32_t chunk_code;
241  int64_t chunk_size;
242  char key[5] = { 0 };
243  char *value;
244 
245  chunk_code = avio_rl32(pb);
246  chunk_size = avio_rl32(pb);
247  if (avio_feof(pb)) {
248  if (chunk_code || chunk_size) {
249  av_log(s, AV_LOG_WARNING, "INFO subchunk truncated\n");
250  return AVERROR_INVALIDDATA;
251  }
252  return AVERROR_EOF;
253  }
254  if (chunk_size > end ||
255  end - chunk_size < cur ||
256  chunk_size == UINT_MAX) {
257  avio_seek(pb, -9, SEEK_CUR);
258  chunk_code = avio_rl32(pb);
259  chunk_size = avio_rl32(pb);
260  if (chunk_size > end || end - chunk_size < cur || chunk_size == UINT_MAX) {
261  av_log(s, AV_LOG_WARNING, "too big INFO subchunk\n");
262  return AVERROR_INVALIDDATA;
263  }
264  }
265 
266  chunk_size += (chunk_size & 1);
267 
268  if (!chunk_code) {
269  if (chunk_size)
270  avio_skip(pb, chunk_size);
271  else if (pb->eof_reached) {
272  av_log(s, AV_LOG_WARNING, "truncated file\n");
273  return AVERROR_EOF;
274  }
275  continue;
276  }
277 
278  value = av_mallocz(chunk_size + 1);
279  if (!value) {
280  av_log(s, AV_LOG_ERROR,
281  "out of memory, unable to read INFO tag\n");
282  return AVERROR(ENOMEM);
283  }
284 
285  AV_WL32(key, chunk_code);
286  // Work around VC++ 2015 Update 1 code-gen bug:
287  // https://connect.microsoft.com/VisualStudio/feedback/details/2291638
288  key[4] = 0;
289 
290  if (avio_read(pb, value, chunk_size) != chunk_size) {
292  "premature end of file while reading INFO tag\n");
293  }
294 
295  av_dict_set(&s->metadata, key, value, AV_DICT_DONT_STRDUP_VAL);
296  }
297 
298  return 0;
299 }
Bytestream IO Context.
Definition: avio.h:161
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition: error.h:59
enum AVCodecID ff_codec_get_id(const AVCodecTag *tags, unsigned int tag)
Definition: utils.c:3124
#define AV_LOG_WARNING
Something somehow does not look correct.
Definition: log.h:182
#define FF_ARG_GUID(g)
Definition: riff.h:103
const char * g
Definition: vf_curves.c:115
#define avpriv_request_sample(...)
enum AVCodecID id
Definition: riff.h:93
enum AVCodecID codec_id
Specific type of the encoded data (the codec used).
Definition: avcodec.h:3953
int64_t avio_seek(AVIOContext *s, int64_t offset, int whence)
fseek() equivalent for AVIOContext.
Definition: aviobuf.c:246
enum AVCodecID ff_wav_codec_get_id(unsigned int tag, int bps)
Definition: riffdec.c:194
int64_t avio_skip(AVIOContext *s, int64_t offset)
Skip given number of bytes forward.
Definition: aviobuf.c:331
const char * key
void * av_mallocz(size_t size)
Allocate a memory block with alignment suitable for all memory accesses (including vectors if availab...
Definition: mem.c:236
unsigned int avio_rb16(AVIOContext *s)
Definition: aviobuf.c:786
uint64_t_TMPL AV_WL64 unsigned int_TMPL AV_WL32 unsigned int_TMPL AV_WL24 unsigned int_TMPL AV_RL16
Definition: bytestream.h:87
This struct describes the properties of an encoded stream.
Definition: avcodec.h:3945
const AVCodecGuid ff_codec_wav_guids[]
Definition: riff.c:604
Format I/O context.
Definition: avformat.h:1358
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:211
#define FF_AMBISONIC_BASE_GUID
Definition: riff.h:111
#define av_assert0(cond)
assert() equivalent, that is always enabled.
Definition: avassert.h:37
Public dictionary API.
uint8_t
static int nb_streams
Definition: ffprobe.c:280
#define FF_MEDIASUBTYPE_BASE_GUID
Definition: riff.h:109
int width
Video only.
Definition: avcodec.h:4019
unsigned int avio_rb32(AVIOContext *s)
Definition: aviobuf.c:801
static av_cold int end(AVCodecContext *avctx)
Definition: avrndec.c:90
GLsizei GLboolean const GLfloat * value
Definition: opengl_enc.c:108
uint32_t tag
Definition: movenc.c:1496
#define AVERROR_EOF
End of file.
Definition: error.h:55
ptrdiff_t size
Definition: opengl_enc.c:100
static av_always_inline int64_t avio_tell(AVIOContext *s)
ftell() equivalent for AVIOContext.
Definition: avio.h:557
uint64_t channel_layout
Audio only.
Definition: avcodec.h:4055
#define av_log(a,...)
int avio_read(AVIOContext *s, unsigned char *buf, int size)
Read size bytes from AVIOContext into buf.
Definition: aviobuf.c:648
int64_t bit_rate
The average bitrate of the encoded data (in bits per second).
Definition: avcodec.h:3982
#define i(width, name, range_min, range_max)
Definition: cbs_h2645.c:260
AVCodecID
Identify the syntax and semantics of the bitstream.
Definition: avcodec.h:215
#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:1598
error code definitions
unsigned int avio_rl32(AVIOContext *s)
Definition: aviobuf.c:770
enum AVCodecID ff_codec_guid_get_id(const AVCodecGuid *guids, ff_asf_guid guid)
Definition: riffdec.c:44
enum AVMediaType codec_type
General type of the encoded data.
Definition: avcodec.h:3949
const AVCodecTag ff_codec_wav_tags[]
Definition: riff.c:493
int block_align
Audio only.
Definition: avcodec.h:4070
#define FFMIN(a, b)
Definition: common.h:96
#define AV_DICT_DONT_STRDUP_VAL
Take ownership of a value that&#39;s been allocated with av_malloc() or another memory allocation functio...
Definition: dict.h:76
internal header for RIFF based (de)muxers do NOT include this in end user applications ...
int32_t
#define s(width, name)
Definition: cbs_vp9.c:257
uint8_t ff_asf_guid[16]
Definition: riff.h:90
Stream structure.
Definition: avformat.h:881
#define AVERROR_PATCHWELCOME
Not yet implemented in FFmpeg, patches welcome.
Definition: error.h:62
Libavcodec external API header.
AVIOContext * pb
I/O context.
Definition: avformat.h:1400
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
#define FF_BROKEN_BASE_GUID
Definition: riff.h:113
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:3136
void avpriv_report_missing_feature(void *avc, const char *msg,...) av_printf_format(2
Log a generic warning message about a missing feature.
int sample_rate
Audio only.
Definition: avcodec.h:4063
int ff_get_wav_header(AVFormatContext *s, AVIOContext *pb, AVCodecParameters *par, int size, int big_endian)
Definition: riffdec.c:91
int64_t bitrate
Definition: h264_levels.c:131
unsigned int avio_rl16(AVIOContext *s)
Definition: aviobuf.c:754
Main libavformat public API header.
#define FF_PRI_GUID
Definition: riff.h:99
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:3305
unsigned bps
Definition: movenc.c:1497
int eof_reached
true if was unable to read due to error or eof
Definition: avio.h:239
int bits_per_coded_sample
The number of bits per sample in the codedwords.
Definition: avcodec.h:3995
uint8_t * extradata
Extra binary data needed for initializing the decoder, codec-dependent.
Definition: avcodec.h:3967
int channels
Audio only.
Definition: avcodec.h:4059
int ff_get_guid(AVIOContext *s, ff_asf_guid *g)
Definition: riffdec.c:32
#define av_freep(p)
int ff_read_riff_info(AVFormatContext *s, int64_t size)
Definition: riffdec.c:230
void INT64 start
Definition: avisynth_c.h:766
AVCodecParameters * codecpar
Codec parameters associated with this stream.
Definition: avformat.h:1028
int avio_feof(AVIOContext *s)
Similar to feof() but also returns nonzero on read errors.
Definition: aviobuf.c:358
uint32_t codec_tag
Additional information about the codec (corresponds to the AVI FOURCC).
Definition: avcodec.h:3957
static void parse_waveformatex(AVFormatContext *s, AVIOContext *pb, AVCodecParameters *par)
Definition: riffdec.c:61
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
static av_always_inline int ff_guidcmp(const void *g1, const void *g2)
Definition: riff.h:116
enum AVCodecID id
uint64_t_TMPL AV_WL64 unsigned int_TMPL AV_RL32
Definition: bytestream.h:87
#define AV_WL32(p, v)
Definition: intreadwrite.h:426