FFmpeg
 All Data Structures Namespaces Files Functions Variables Typedefs Enumerations Enumerator Macros Groups Pages
riffdec.c
Go to the documentation of this file.
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(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, unsigned *esize)
212 {
213  int tag1;
214  if(esize) *esize = avio_rl32(pb);
215  else avio_rl32(pb);
216  st->codecpar->width = avio_rl32(pb);
217  st->codecpar->height = (int32_t)avio_rl32(pb);
218  avio_rl16(pb); /* planes */
219  st->codecpar->bits_per_coded_sample = avio_rl16(pb); /* depth */
220  tag1 = avio_rl32(pb);
221  avio_rl32(pb); /* ImageSize */
222  avio_rl32(pb); /* XPelsPerMeter */
223  avio_rl32(pb); /* YPelsPerMeter */
224  avio_rl32(pb); /* ClrUsed */
225  avio_rl32(pb); /* ClrImportant */
226  return tag1;
227 }
228 
230 {
231  int64_t start, end, cur;
232  AVIOContext *pb = s->pb;
233 
234  start = avio_tell(pb);
235  end = start + size;
236 
237  while ((cur = avio_tell(pb)) >= 0 &&
238  cur <= end - 8 /* = tag + size */) {
239  uint32_t chunk_code;
240  int64_t chunk_size;
241  char key[5] = { 0 };
242  char *value;
243 
244  chunk_code = avio_rl32(pb);
245  chunk_size = avio_rl32(pb);
246  if (avio_feof(pb)) {
247  if (chunk_code || chunk_size) {
248  av_log(s, AV_LOG_WARNING, "INFO subchunk truncated\n");
249  return AVERROR_INVALIDDATA;
250  }
251  return AVERROR_EOF;
252  }
253  if (chunk_size > end ||
254  end - chunk_size < cur ||
255  chunk_size == UINT_MAX) {
256  avio_seek(pb, -9, SEEK_CUR);
257  chunk_code = avio_rl32(pb);
258  chunk_size = avio_rl32(pb);
259  if (chunk_size > end || end - chunk_size < cur || chunk_size == UINT_MAX) {
260  av_log(s, AV_LOG_WARNING, "too big INFO subchunk\n");
261  return AVERROR_INVALIDDATA;
262  }
263  }
264 
265  chunk_size += (chunk_size & 1);
266 
267  if (!chunk_code) {
268  if (chunk_size)
269  avio_skip(pb, chunk_size);
270  else if (pb->eof_reached) {
271  av_log(s, AV_LOG_WARNING, "truncated file\n");
272  return AVERROR_EOF;
273  }
274  continue;
275  }
276 
277  value = av_mallocz(chunk_size + 1);
278  if (!value) {
279  av_log(s, AV_LOG_ERROR,
280  "out of memory, unable to read INFO tag\n");
281  return AVERROR(ENOMEM);
282  }
283 
284  AV_WL32(key, chunk_code);
285  // Work around VC++ 2015 Update 1 code-gen bug:
286  // https://connect.microsoft.com/VisualStudio/feedback/details/2291638
287  key[4] = 0;
288 
289  if (avio_read(pb, value, chunk_size) != chunk_size) {
291  "premature end of file while reading INFO tag\n");
292  }
293 
294  av_dict_set(&s->metadata, key, value, AV_DICT_DONT_STRDUP_VAL);
295  }
296 
297  return 0;
298 }
const char * s
Definition: avisynth_c.h:768
Bytestream IO Context.
Definition: avio.h:155
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition: error.h:59
int ff_get_bmp_header(AVIOContext *pb, AVStream *st, unsigned *esize)
Read BITMAPINFOHEADER structure and set AVStream codec width, height and bits_per_encoded_sample fiel...
Definition: riffdec.c:211
enum AVCodecID ff_codec_get_id(const AVCodecTag *tags, unsigned int tag)
Definition: utils.c:3050
#define AV_LOG_WARNING
Something somehow does not look correct.
Definition: log.h:182
#define FF_ARG_GUID(g)
Definition: riff.h:102
const char * g
Definition: vf_curves.c:112
enum AVCodecID id
Definition: riff.h:92
enum AVCodecID codec_id
Specific type of the encoded data (the codec used).
Definition: avcodec.h:4066
int64_t avio_seek(AVIOContext *s, int64_t offset, int whence)
fseek() equivalent for AVIOContext.
Definition: aviobuf.c:231
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:316
void * av_mallocz(size_t size)
Allocate a memory block with alignment suitable for all memory accesses (including vectors if availab...
Definition: mem.c:222
unsigned int avio_rb16(AVIOContext *s)
Definition: aviobuf.c:754
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:4058
const AVCodecGuid ff_codec_wav_guids[]
Definition: riff.c:569
Format I/O context.
Definition: avformat.h:1349
#define FF_AMBISONIC_BASE_GUID
Definition: riff.h:110
#define av_assert0(cond)
assert() equivalent, that is always enabled.
Definition: avassert.h:37
Public dictionary API.
void void avpriv_request_sample(void *avc, const char *msg,...) av_printf_format(2
Log a generic warning message about a missing feature.
uint8_t
static int nb_streams
Definition: ffprobe.c:273
#define FF_MEDIASUBTYPE_BASE_GUID
Definition: riff.h:108
int width
Video only.
Definition: avcodec.h:4132
unsigned int avio_rb32(AVIOContext *s)
Definition: aviobuf.c:769
static av_cold int end(AVCodecContext *avctx)
Definition: avrndec.c:90
uint32_t tag
Definition: movenc.c:1413
#define AVERROR_EOF
End of file.
Definition: error.h:55
ptrdiff_t size
Definition: opengl_enc.c:101
static av_always_inline int64_t avio_tell(AVIOContext *s)
ftell() equivalent for AVIOContext.
Definition: avio.h:525
uint64_t channel_layout
Audio only.
Definition: avcodec.h:4168
#define av_log(a,...)
int avio_read(AVIOContext *s, unsigned char *buf, int size)
Read size bytes from AVIOContext into buf.
Definition: aviobuf.c:616
int64_t bit_rate
The average bitrate of the encoded data (in bits per second).
Definition: avcodec.h:4095
static void parse_waveformatex(AVIOContext *pb, AVCodecParameters *par)
Definition: riffdec.c:61
AVCodecID
Identify the syntax and semantics of the bitstream.
Definition: avcodec.h:214
#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:1567
error code definitions
unsigned int avio_rl32(AVIOContext *s)
Definition: aviobuf.c:738
#define AVERROR(e)
Definition: error.h:43
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:4062
const AVCodecTag ff_codec_wav_tags[]
Definition: riff.c:458
int block_align
Audio only.
Definition: avcodec.h:4183
#define FFMIN(a, b)
Definition: common.h:96
#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:76
GLsizei GLboolean const GLfloat * value
Definition: opengl_enc.c:109
internal header for RIFF based (de)muxers do NOT include this in end user applications ...
int32_t
uint8_t ff_asf_guid[16]
Definition: riff.h:89
Stream structure.
Definition: avformat.h:889
#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:1391
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:112
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:3062
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:4176
int ff_get_wav_header(AVFormatContext *s, AVIOContext *pb, AVCodecParameters *par, int size, int big_endian)
Definition: riffdec.c:91
unsigned int avio_rl16(AVIOContext *s)
Definition: aviobuf.c:722
Main libavformat public API header.
#define FF_PRI_GUID
Definition: riff.h:98
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:3234
unsigned bps
Definition: movenc.c:1414
int eof_reached
true if eof reached
Definition: avio.h:230
int bits_per_coded_sample
The number of bits per sample in the codedwords.
Definition: avcodec.h:4108
uint8_t * extradata
Extra binary data needed for initializing the decoder, codec-dependent.
Definition: avcodec.h:4080
int channels
Audio only.
Definition: avcodec.h:4172
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:229
void INT64 start
Definition: avisynth_c.h:690
AVCodecParameters * codecpar
Definition: avformat.h:1252
int avio_feof(AVIOContext *s)
feof() equivalent for AVIOContext.
Definition: aviobuf.c:340
uint32_t codec_tag
Additional information about the codec (corresponds to the AVI FOURCC).
Definition: avcodec.h:4070
static av_always_inline int ff_guidcmp(const void *g1, const void *g2)
Definition: riff.h:115
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:431