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 = avio_rl16(pb);
65  if (bps)
67 
68  par->channel_layout = avio_rl32(pb); /* dwChannelMask */
69 
70  ff_get_guid(pb, &subformat);
71  if (!memcmp(subformat + 4,
72  (const uint8_t[]){ FF_AMBISONIC_BASE_GUID }, 12) ||
73  !memcmp(subformat + 4,
74  (const uint8_t[]){ FF_MEDIASUBTYPE_BASE_GUID }, 12)) {
75  par->codec_tag = AV_RL32(subformat);
78  } else {
80  if (!par->codec_id)
82  "unknown subformat:"FF_PRI_GUID"\n",
83  FF_ARG_GUID(subformat));
84  }
85 }
86 
87 /* "big_endian" values are needed for RIFX file format */
89  AVCodecParameters *par, int size, int big_endian)
90 {
91  int id;
92  uint64_t bitrate = 0;
93 
94  if (size < 14) {
95  avpriv_request_sample(s, "wav header size < 14");
96  return AVERROR_INVALIDDATA;
97  }
98 
100  if (!big_endian) {
101  id = avio_rl16(pb);
102  if (id != 0x0165) {
103  par->channels = avio_rl16(pb);
104  par->sample_rate = avio_rl32(pb);
105  bitrate = avio_rl32(pb) * 8LL;
106  par->block_align = avio_rl16(pb);
107  }
108  } else {
109  id = avio_rb16(pb);
110  par->channels = avio_rb16(pb);
111  par->sample_rate = avio_rb32(pb);
112  bitrate = avio_rb32(pb) * 8LL;
113  par->block_align = avio_rb16(pb);
114  }
115  if (size == 14) { /* We're dealing with plain vanilla WAVEFORMAT */
116  par->bits_per_coded_sample = 8;
117  } else {
118  if (!big_endian) {
119  par->bits_per_coded_sample = avio_rl16(pb);
120  } else {
121  par->bits_per_coded_sample = avio_rb16(pb);
122  }
123  }
124  if (id == 0xFFFE) {
125  par->codec_tag = 0;
126  } else {
127  par->codec_tag = id;
128  par->codec_id = ff_wav_codec_get_id(id,
129  par->bits_per_coded_sample);
130  }
131  if (size >= 18 && id != 0x0165) { /* We're obviously dealing with WAVEFORMATEX */
132  int cbSize = avio_rl16(pb); /* cbSize */
133  if (big_endian) {
134  avpriv_report_missing_feature(s, "WAVEFORMATEX support for RIFX files");
135  return AVERROR_PATCHWELCOME;
136  }
137  size -= 18;
138  cbSize = FFMIN(size, cbSize);
139  if (cbSize >= 22 && id == 0xfffe) { /* WAVEFORMATEXTENSIBLE */
140  parse_waveformatex(pb, par);
141  cbSize -= 22;
142  size -= 22;
143  }
144  if (cbSize > 0) {
145  av_freep(&par->extradata);
146  if (ff_get_extradata(s, par, pb, cbSize) < 0)
147  return AVERROR(ENOMEM);
148  size -= cbSize;
149  }
150 
151  /* It is possible for the chunk to contain garbage at the end */
152  if (size > 0)
153  avio_skip(pb, size);
154  } else if (id == 0x0165 && size >= 32) {
155  int nb_streams, i;
156 
157  size -= 4;
158  av_freep(&par->extradata);
159  if (ff_get_extradata(s, par, pb, size) < 0)
160  return AVERROR(ENOMEM);
161  nb_streams = AV_RL16(par->extradata + 4);
162  par->sample_rate = AV_RL32(par->extradata + 12);
163  par->channels = 0;
164  bitrate = 0;
165  if (size < 8 + nb_streams * 20)
166  return AVERROR_INVALIDDATA;
167  for (i = 0; i < nb_streams; i++)
168  par->channels += par->extradata[8 + i * 20 + 17];
169  }
170 
171  par->bit_rate = bitrate;
172 
173  if (par->sample_rate <= 0) {
174  av_log(s, AV_LOG_ERROR,
175  "Invalid sample rate: %d\n", par->sample_rate);
176  return AVERROR_INVALIDDATA;
177  }
178  if (par->codec_id == AV_CODEC_ID_AAC_LATM) {
179  /* Channels and sample_rate values are those prior to applying SBR
180  * and/or PS. */
181  par->channels = 0;
182  par->sample_rate = 0;
183  }
184  /* override bits_per_coded_sample for G.726 */
185  if (par->codec_id == AV_CODEC_ID_ADPCM_G726 && par->sample_rate)
186  par->bits_per_coded_sample = par->bit_rate / par->sample_rate;
187 
188  return 0;
189 }
190 
191 enum AVCodecID ff_wav_codec_get_id(unsigned int tag, int bps)
192 {
193  enum AVCodecID id;
195  if (id <= 0)
196  return id;
197 
198  if (id == AV_CODEC_ID_PCM_S16LE)
199  id = ff_get_pcm_codec_id(bps, 0, 0, ~1);
200  else if (id == AV_CODEC_ID_PCM_F32LE)
201  id = ff_get_pcm_codec_id(bps, 1, 0, 0);
202 
203  if (id == AV_CODEC_ID_ADPCM_IMA_WAV && bps == 8)
205  return id;
206 }
207 
208 int ff_get_bmp_header(AVIOContext *pb, AVStream *st, unsigned *esize)
209 {
210  int tag1;
211  if(esize) *esize = avio_rl32(pb);
212  else avio_rl32(pb);
213  st->codecpar->width = avio_rl32(pb);
214  st->codecpar->height = (int32_t)avio_rl32(pb);
215  avio_rl16(pb); /* planes */
216  st->codecpar->bits_per_coded_sample = avio_rl16(pb); /* depth */
217  tag1 = avio_rl32(pb);
218  avio_rl32(pb); /* ImageSize */
219  avio_rl32(pb); /* XPelsPerMeter */
220  avio_rl32(pb); /* YPelsPerMeter */
221  avio_rl32(pb); /* ClrUsed */
222  avio_rl32(pb); /* ClrImportant */
223  return tag1;
224 }
225 
227 {
228  int64_t start, end, cur;
229  AVIOContext *pb = s->pb;
230 
231  start = avio_tell(pb);
232  end = start + size;
233 
234  while ((cur = avio_tell(pb)) >= 0 &&
235  cur <= end - 8 /* = tag + size */) {
236  uint32_t chunk_code;
237  int64_t chunk_size;
238  char key[5] = { 0 };
239  char *value;
240 
241  chunk_code = avio_rl32(pb);
242  chunk_size = avio_rl32(pb);
243  if (avio_feof(pb)) {
244  if (chunk_code || chunk_size) {
245  av_log(s, AV_LOG_WARNING, "INFO subchunk truncated\n");
246  return AVERROR_INVALIDDATA;
247  }
248  return AVERROR_EOF;
249  }
250  if (chunk_size > end ||
251  end - chunk_size < cur ||
252  chunk_size == UINT_MAX) {
253  avio_seek(pb, -9, SEEK_CUR);
254  chunk_code = avio_rl32(pb);
255  chunk_size = avio_rl32(pb);
256  if (chunk_size > end || end - chunk_size < cur || chunk_size == UINT_MAX) {
257  av_log(s, AV_LOG_WARNING, "too big INFO subchunk\n");
258  return AVERROR_INVALIDDATA;
259  }
260  }
261 
262  chunk_size += (chunk_size & 1);
263 
264  if (!chunk_code) {
265  if (chunk_size)
266  avio_skip(pb, chunk_size);
267  else if (pb->eof_reached) {
268  av_log(s, AV_LOG_WARNING, "truncated file\n");
269  return AVERROR_EOF;
270  }
271  continue;
272  }
273 
274  value = av_mallocz(chunk_size + 1);
275  if (!value) {
276  av_log(s, AV_LOG_ERROR,
277  "out of memory, unable to read INFO tag\n");
278  return AVERROR(ENOMEM);
279  }
280 
281  AV_WL32(key, chunk_code);
282  // Work around VC++ 2015 Update 1 code-gen bug:
283  // https://connect.microsoft.com/VisualStudio/feedback/details/2291638
284  key[4] = 0;
285 
286  if (avio_read(pb, value, chunk_size) != chunk_size) {
288  "premature end of file while reading INFO tag\n");
289  }
290 
291  av_dict_set(&s->metadata, key, value, AV_DICT_DONT_STRDUP_VAL);
292  }
293 
294  return 0;
295 }
const char * s
Definition: avisynth_c.h:631
Bytestream IO Context.
Definition: avio.h:147
#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:208
enum AVCodecID id
Definition: mxfenc.c:104
enum AVCodecID ff_codec_get_id(const AVCodecTag *tags, unsigned int tag)
Definition: utils.c:2946
#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:108
enum AVCodecID id
Definition: riff.h:92
enum AVCodecID codec_id
Specific type of the encoded data (the codec used).
Definition: avcodec.h:3922
int64_t avio_seek(AVIOContext *s, int64_t offset, int whence)
fseek() equivalent for AVIOContext.
Definition: aviobuf.c:230
enum AVCodecID ff_wav_codec_get_id(unsigned int tag, int bps)
Definition: riffdec.c:191
int64_t avio_skip(AVIOContext *s, int64_t offset)
Skip given number of bytes forward.
Definition: aviobuf.c:304
unsigned int avio_rb16(AVIOContext *s)
Definition: aviobuf.c:736
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:3914
const AVCodecGuid ff_codec_wav_guids[]
Definition: riff.c:542
Format I/O context.
Definition: avformat.h:1325
#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:254
#define FF_MEDIASUBTYPE_BASE_GUID
Definition: riff.h:108
int width
Video only.
Definition: avcodec.h:3988
unsigned int avio_rb32(AVIOContext *s)
Definition: aviobuf.c:751
static av_cold int end(AVCodecContext *avctx)
Definition: avrndec.c:90
uint32_t tag
Definition: movenc.c:1367
#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:511
uint64_t channel_layout
Audio only.
Definition: avcodec.h:4024
#define av_log(a,...)
int avio_read(AVIOContext *s, unsigned char *buf, int size)
Read size bytes from AVIOContext into buf.
Definition: aviobuf.c:598
int64_t bit_rate
The average bitrate of the encoded data (in bits per second).
Definition: avcodec.h:3951
static void parse_waveformatex(AVIOContext *pb, AVCodecParameters *par)
Definition: riffdec.c:61
AVCodecID
Identify the syntax and semantics of the bitstream.
Definition: avcodec.h:189
#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:1539
error code definitions
unsigned int avio_rl32(AVIOContext *s)
Definition: aviobuf.c:720
#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:3918
const AVCodecTag ff_codec_wav_tags[]
Definition: riff.c:432
int block_align
Audio only.
Definition: avcodec.h:4039
#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:876
#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:1367
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:69
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:2958
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:4032
int ff_get_wav_header(AVFormatContext *s, AVIOContext *pb, AVCodecParameters *par, int size, int big_endian)
Definition: riffdec.c:88
unsigned int avio_rl16(AVIOContext *s)
Definition: aviobuf.c:704
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:3128
unsigned bps
Definition: movenc.c:1368
int eof_reached
true if eof reached
Definition: avio.h:222
int bits_per_coded_sample
The number of bits per sample in the codedwords.
Definition: avcodec.h:3964
uint8_t * extradata
Extra binary data needed for initializing the decoder, codec-dependent.
Definition: avcodec.h:3936
int channels
Audio only.
Definition: avcodec.h:4028
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:226
void INT64 start
Definition: avisynth_c.h:553
AVCodecParameters * codecpar
Definition: avformat.h:1006
int avio_feof(AVIOContext *s)
feof() equivalent for AVIOContext.
Definition: aviobuf.c:328
uint32_t codec_tag
Additional information about the codec (corresponds to the AVI FOURCC).
Definition: avcodec.h:3926
static av_always_inline int ff_guidcmp(const void *g1, const void *g2)
Definition: riff.h:113
uint64_t_TMPL AV_WL64 unsigned int_TMPL AV_RL32
Definition: bytestream.h:87
void * av_mallocz(size_t size)
Allocate a block of size bytes with alignment suitable for all memory accesses (including vectors if ...
Definition: mem.c:252
#define AV_WL32(p, v)
Definition: intreadwrite.h:426