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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  av_assert0(sizeof(*g) == 16); //compiler will optimize this out
35  if (avio_read(s, *g, sizeof(*g)) < (int)sizeof(*g)) {
36  memset(*g, 0, sizeof(*g));
37  return AVERROR_INVALIDDATA;
38  }
39  return 0;
40 }
41 
43 {
44  int i;
45  for (i = 0; guids[i].id != AV_CODEC_ID_NONE; i++)
46  if (!ff_guidcmp(guids[i].guid, guid))
47  return guids[i].id;
48  return AV_CODEC_ID_NONE;
49 }
50 
51 /* We could be given one of the three possible structures here:
52  * WAVEFORMAT, PCMWAVEFORMAT or WAVEFORMATEX. Each structure
53  * is an expansion of the previous one with the fields added
54  * at the bottom. PCMWAVEFORMAT adds 'WORD wBitsPerSample' and
55  * WAVEFORMATEX adds 'WORD cbSize' and basically makes itself
56  * an openended structure.
57  */
58 
60 {
61  ff_asf_guid subformat;
62  int bps = avio_rl16(pb);
63  if (bps)
65 
66  c->channel_layout = avio_rl32(pb); /* dwChannelMask */
67 
68  ff_get_guid(pb, &subformat);
69  if (!memcmp(subformat + 4,
70  (const uint8_t[]){ FF_MEDIASUBTYPE_BASE_GUID }, 12)) {
71  c->codec_tag = AV_RL32(subformat);
74  } else {
76  if (!c->codec_id)
78  "unknown subformat:"FF_PRI_GUID"\n",
79  FF_ARG_GUID(subformat));
80  }
81 }
82 
83 /* "big_endian" values are needed for RIFX file format */
84 int ff_get_wav_header(AVIOContext *pb, AVCodecContext *codec, int size, int big_endian)
85 {
86  int id;
87 
88  if (size < 14)
89  avpriv_request_sample(codec, "wav header size < 14");
90 
92  if (!big_endian) {
93  id = avio_rl16(pb);
94  codec->channels = avio_rl16(pb);
95  codec->sample_rate = avio_rl32(pb);
96  codec->bit_rate = avio_rl32(pb) * 8;
97  codec->block_align = avio_rl16(pb);
98  } else {
99  id = avio_rb16(pb);
100  codec->channels = avio_rb16(pb);
101  codec->sample_rate = avio_rb32(pb);
102  codec->bit_rate = avio_rb32(pb) * 8;
103  codec->block_align = avio_rb16(pb);
104  }
105  if (size == 14) { /* We're dealing with plain vanilla WAVEFORMAT */
106  codec->bits_per_coded_sample = 8;
107  } else {
108  if (!big_endian) {
109  codec->bits_per_coded_sample = avio_rl16(pb);
110  } else {
111  codec->bits_per_coded_sample = avio_rb16(pb);
112  }
113  }
114  if (id == 0xFFFE) {
115  codec->codec_tag = 0;
116  } else {
117  codec->codec_tag = id;
118  codec->codec_id = ff_wav_codec_get_id(id,
119  codec->bits_per_coded_sample);
120  }
121  if (size >= 18) { /* We're obviously dealing with WAVEFORMATEX */
122  int cbSize = avio_rl16(pb); /* cbSize */
123  if (big_endian) {
124  avpriv_report_missing_feature(codec, "WAVEFORMATEX support for RIFX files\n");
125  return AVERROR_PATCHWELCOME;
126  }
127  size -= 18;
128  cbSize = FFMIN(size, cbSize);
129  if (cbSize >= 22 && id == 0xfffe) { /* WAVEFORMATEXTENSIBLE */
130  parse_waveformatex(pb, codec);
131  cbSize -= 22;
132  size -= 22;
133  }
134  if (cbSize > 0) {
135  av_freep(&codec->extradata);
136  if (ff_get_extradata(codec, pb, cbSize) < 0)
137  return AVERROR(ENOMEM);
138  size -= cbSize;
139  }
140 
141  /* It is possible for the chunk to contain garbage at the end */
142  if (size > 0)
143  avio_skip(pb, size);
144  }
145  if (codec->sample_rate <= 0) {
147  "Invalid sample rate: %d\n", codec->sample_rate);
148  return AVERROR_INVALIDDATA;
149  }
150  if (codec->codec_id == AV_CODEC_ID_AAC_LATM) {
151  /* Channels and sample_rate values are those prior to applying SBR
152  * and/or PS. */
153  codec->channels = 0;
154  codec->sample_rate = 0;
155  }
156  /* override bits_per_coded_sample for G.726 */
157  if (codec->codec_id == AV_CODEC_ID_ADPCM_G726 && codec->sample_rate)
158  codec->bits_per_coded_sample = codec->bit_rate / codec->sample_rate;
159 
160  return 0;
161 }
162 
163 enum AVCodecID ff_wav_codec_get_id(unsigned int tag, int bps)
164 {
165  enum AVCodecID id;
167  if (id <= 0)
168  return id;
169 
170  if (id == AV_CODEC_ID_PCM_S16LE)
171  id = ff_get_pcm_codec_id(bps, 0, 0, ~1);
172  else if (id == AV_CODEC_ID_PCM_F32LE)
173  id = ff_get_pcm_codec_id(bps, 1, 0, 0);
174 
175  if (id == AV_CODEC_ID_ADPCM_IMA_WAV && bps == 8)
177  return id;
178 }
179 
180 int ff_get_bmp_header(AVIOContext *pb, AVStream *st, unsigned *esize)
181 {
182  int tag1;
183  if(esize) *esize = avio_rl32(pb);
184  else avio_rl32(pb);
185  st->codec->width = avio_rl32(pb);
186  st->codec->height = (int32_t)avio_rl32(pb);
187  avio_rl16(pb); /* planes */
188  st->codec->bits_per_coded_sample = avio_rl16(pb); /* depth */
189  tag1 = avio_rl32(pb);
190  avio_rl32(pb); /* ImageSize */
191  avio_rl32(pb); /* XPelsPerMeter */
192  avio_rl32(pb); /* YPelsPerMeter */
193  avio_rl32(pb); /* ClrUsed */
194  avio_rl32(pb); /* ClrImportant */
195  return tag1;
196 }
197 
199 {
200  int64_t start, end, cur;
201  AVIOContext *pb = s->pb;
202 
203  start = avio_tell(pb);
204  end = start + size;
205 
206  while ((cur = avio_tell(pb)) >= 0 &&
207  cur <= end - 8 /* = tag + size */) {
208  uint32_t chunk_code;
209  int64_t chunk_size;
210  char key[5] = { 0 };
211  char *value;
212 
213  chunk_code = avio_rl32(pb);
214  chunk_size = avio_rl32(pb);
215  if (avio_feof(pb)) {
216  if (chunk_code || chunk_size) {
217  av_log(s, AV_LOG_WARNING, "INFO subchunk truncated\n");
218  return AVERROR_INVALIDDATA;
219  }
220  return AVERROR_EOF;
221  }
222  if (chunk_size > end ||
223  end - chunk_size < cur ||
224  chunk_size == UINT_MAX) {
225  avio_seek(pb, -9, SEEK_CUR);
226  chunk_code = avio_rl32(pb);
227  chunk_size = avio_rl32(pb);
228  if (chunk_size > end || end - chunk_size < cur || chunk_size == UINT_MAX) {
229  av_log(s, AV_LOG_WARNING, "too big INFO subchunk\n");
230  return AVERROR_INVALIDDATA;
231  }
232  }
233 
234  chunk_size += (chunk_size & 1);
235 
236  if (!chunk_code) {
237  if (chunk_size)
238  avio_skip(pb, chunk_size);
239  else if (pb->eof_reached) {
240  av_log(s, AV_LOG_WARNING, "truncated file\n");
241  return AVERROR_EOF;
242  }
243  continue;
244  }
245 
246  value = av_mallocz(chunk_size + 1);
247  if (!value) {
248  av_log(s, AV_LOG_ERROR,
249  "out of memory, unable to read INFO tag\n");
250  return AVERROR(ENOMEM);
251  }
252 
253  AV_WL32(key, chunk_code);
254 
255  if (avio_read(pb, value, chunk_size) != chunk_size) {
257  "premature end of file while reading INFO tag\n");
258  }
259 
260  av_dict_set(&s->metadata, key, value, AV_DICT_DONT_STRDUP_VAL);
261  }
262 
263  return 0;
264 }
#define NULL
Definition: coverity.c:32
const char * s
Definition: avisynth_c.h:631
Bytestream IO Context.
Definition: avio.h:111
#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:180
enum AVCodecID id
Definition: mxfenc.c:99
enum AVCodecID ff_codec_get_id(const AVCodecTag *tags, unsigned int tag)
Definition: utils.c:2713
#define AV_LOG_WARNING
Something somehow does not look correct.
Definition: log.h:182
#define FF_ARG_GUID(g)
Definition: riff.h:97
const char * g
Definition: vf_curves.c:108
int ff_get_extradata(AVCodecContext *avctx, AVIOContext *pb, int size)
Allocate extradata with additional FF_INPUT_BUFFER_PADDING_SIZE at end which is always set to 0 and f...
Definition: utils.c:2885
enum AVCodecID id
Definition: riff.h:87
int64_t avio_seek(AVIOContext *s, int64_t offset, int whence)
fseek() equivalent for AVIOContext.
Definition: aviobuf.c:203
enum AVCodecID ff_wav_codec_get_id(unsigned int tag, int bps)
Definition: riffdec.c:163
int64_t avio_skip(AVIOContext *s, int64_t offset)
Skip given number of bytes forward.
Definition: aviobuf.c:276
unsigned int avio_rb16(AVIOContext *s)
Definition: aviobuf.c:674
int block_align
number of bytes per packet if constant and known or 0 Used by some WAV based audio codecs...
Definition: avcodec.h:2022
const AVCodecGuid ff_codec_wav_guids[]
Definition: riff.c:480
Format I/O context.
Definition: avformat.h:1272
#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
#define FF_MEDIASUBTYPE_BASE_GUID
Definition: riff.h:103
unsigned int avio_rb32(AVIOContext *s)
Definition: aviobuf.c:689
static av_cold int end(AVCodecContext *avctx)
Definition: avrndec.c:67
uint8_t * extradata
some codecs need / can use extradata like Huffman tables.
Definition: avcodec.h:1355
int ff_get_wav_header(AVIOContext *pb, AVCodecContext *codec, int size, int big_endian)
Definition: riffdec.c:84
static void parse_waveformatex(AVIOContext *pb, AVCodecContext *c)
Definition: riffdec.c:59
uint32_t tag
Definition: movenc.c:1333
#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:365
int bits_per_coded_sample
bits per sample/pixel from the demuxer (needed for huffyuv).
Definition: avcodec.h:2720
#define av_log(a,...)
int avio_read(AVIOContext *s, unsigned char *buf, int size)
Read size bytes from AVIOContext into buf.
Definition: aviobuf.c:537
AVCodecID
Identify the syntax and semantics of the bitstream.
Definition: avcodec.h:102
#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:1482
error code definitions
unsigned int avio_rl32(AVIOContext *s)
Definition: aviobuf.c:658
#define AVERROR(e)
Definition: error.h:43
enum AVCodecID ff_codec_guid_get_id(const AVCodecGuid *guids, ff_asf_guid guid)
Definition: riffdec.c:42
const AVCodecTag ff_codec_wav_tags[]
Definition: riff.c:376
Libavcodec external API header.
uint64_t channel_layout
Audio channel layout.
Definition: avcodec.h:2046
AVCodecContext * codec
Codec context associated with this stream.
Definition: avformat.h:861
int bit_rate
the average bitrate
Definition: avcodec.h:1305
#define FFMIN(a, b)
Definition: common.h:66
#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:78
int width
picture width / height.
Definition: avcodec.h:1414
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:84
Stream structure.
Definition: avformat.h:842
#define AVERROR_PATCHWELCOME
Not yet implemented in FFmpeg, patches welcome.
Definition: error.h:62
enum AVMediaType codec_type
Definition: avcodec.h:1249
enum AVCodecID codec_id
Definition: avcodec.h:1258
int sample_rate
samples per second
Definition: avcodec.h:1985
AVIOContext * pb
I/O context.
Definition: avformat.h:1314
main external API structure.
Definition: avcodec.h:1241
unsigned int codec_tag
fourcc (LSB first, so "ABCD" -> ('D'<<24) + ('C'<<16) + ('B'<<8) + 'A').
Definition: avcodec.h:1273
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:2725
void avpriv_report_missing_feature(void *avc, const char *msg,...) av_printf_format(2
Log a generic warning message about a missing feature.
unsigned int avio_rl16(AVIOContext *s)
Definition: aviobuf.c:642
Main libavformat public API header.
static double c[64]
#define FF_PRI_GUID
Definition: riff.h:93
unsigned bps
Definition: movenc.c:1334
int eof_reached
true if eof reached
Definition: avio.h:139
int channels
number of audio channels
Definition: avcodec.h:1986
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:198
void INT64 start
Definition: avisynth_c.h:553
int avio_feof(AVIOContext *s)
feof() equivalent for AVIOContext.
Definition: aviobuf.c:300
static av_always_inline int ff_guidcmp(const void *g1, const void *g2)
Definition: riff.h:106
uint64_t_TMPL AV_WL64 unsigned int_TMPL AV_RL32
Definition: bytestream.h:85
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:250
#define AV_WL32(p, v)
Definition: intreadwrite.h:426