Libav
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 Libav.
6  *
7  * Libav 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  * Libav 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 Libav; 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  { AV_CODEC_ID_AC3, { 0x2C, 0x80, 0x6D, 0xE0, 0x46, 0xDB, 0xCF, 0x11, 0xB4, 0xD1, 0x00, 0x80, 0x5F, 0x6C, 0xBB, 0xEA } },
34  { AV_CODEC_ID_ATRAC3P, { 0xBF, 0xAA, 0x23, 0xE9, 0x58, 0xCB, 0x71, 0x44, 0xA1, 0x19, 0xFF, 0xFA, 0x01, 0xE4, 0xCE, 0x62 } },
35  { AV_CODEC_ID_EAC3, { 0xAF, 0x87, 0xFB, 0xA7, 0x02, 0x2D, 0xFB, 0x42, 0xA4, 0xD4, 0x05, 0xCD, 0x93, 0x84, 0x3B, 0xDD } },
36  { AV_CODEC_ID_MP2, { 0x2B, 0x80, 0x6D, 0xE0, 0x46, 0xDB, 0xCF, 0x11, 0xB4, 0xD1, 0x00, 0x80, 0x5F, 0x6C, 0xBB, 0xEA } },
38 };
39 
41 {
42  int i;
43  for (i = 0; guids[i].id != AV_CODEC_ID_NONE; i++)
44  if (!ff_guidcmp(guids[i].guid, guid))
45  return guids[i].id;
46  return AV_CODEC_ID_NONE;
47 }
48 
49 /* We could be given one of the three possible structures here:
50  * WAVEFORMAT, PCMWAVEFORMAT or WAVEFORMATEX. Each structure
51  * is an expansion of the previous one with the fields added
52  * at the bottom. PCMWAVEFORMAT adds 'WORD wBitsPerSample' and
53  * WAVEFORMATEX adds 'WORD cbSize' and basically makes itself
54  * an openended structure.
55  */
56 
58 {
59  ff_asf_guid subformat;
60  int bps;
61 
62  bps = avio_rl16(pb);
63  if (bps)
65  par->channel_layout = avio_rl32(pb); /* dwChannelMask */
66 
67  ff_get_guid(pb, &subformat);
68  if (!memcmp(subformat + 4,
69  (const uint8_t[]){ FF_MEDIASUBTYPE_BASE_GUID }, 12)) {
70  par->codec_tag = AV_RL32(subformat);
73  } else {
74  par->codec_id = ff_codec_guid_get_id(ff_codec_wav_guids, subformat);
75  if (!par->codec_id)
77  "unknown subformat:"FF_PRI_GUID"\n",
78  FF_ARG_GUID(subformat));
79  }
80 }
81 
83  AVCodecParameters *par, int size)
84 {
85  int id;
86  uint64_t bitrate;
87 
88  if (size < 14)
89  return AVERROR_INVALIDDATA;
90 
91  id = avio_rl16(pb);
93  par->channels = avio_rl16(pb);
94  par->sample_rate = avio_rl32(pb);
95  bitrate = avio_rl32(pb) * 8;
96  par->block_align = avio_rl16(pb);
97  if (size == 14) { /* We're dealing with plain vanilla WAVEFORMAT */
98  par->bits_per_coded_sample = 8;
99  } else
100  par->bits_per_coded_sample = avio_rl16(pb);
101  if (id == 0xFFFE) {
102  par->codec_tag = 0;
103  } else {
104  par->codec_tag = id;
106  }
107  if (size >= 18) { /* We're obviously dealing with WAVEFORMATEX */
108  int cbSize = avio_rl16(pb); /* cbSize */
109  size -= 18;
110  cbSize = FFMIN(size, cbSize);
111  if (cbSize >= 22 && id == 0xfffe) { /* WAVEFORMATEXTENSIBLE */
112  parse_waveformatex(pb, par);
113  cbSize -= 22;
114  size -= 22;
115  }
116  par->extradata_size = cbSize;
117  if (cbSize > 0) {
118  av_free(par->extradata);
119  par->extradata = av_mallocz(par->extradata_size +
121  if (!par->extradata)
122  return AVERROR(ENOMEM);
123  avio_read(pb, par->extradata, par->extradata_size);
124  size -= cbSize;
125  }
126 
127  /* It is possible for the chunk to contain garbage at the end */
128  if (size > 0)
129  avio_skip(pb, size);
130  }
131 
132  if (bitrate > INT_MAX) {
133  if (s->error_recognition & AV_EF_EXPLODE) {
134  av_log(s, AV_LOG_ERROR,
135  "The bitrate %"PRIu64" is too large.\n",
136  bitrate);
137  return AVERROR_INVALIDDATA;
138  } else {
140  "The bitrate %"PRIu64" is too large, resetting to 0.",
141  bitrate);
142  par->bit_rate = 0;
143  }
144  } else {
145  par->bit_rate = bitrate;
146  }
147 
148  if (par->sample_rate <= 0) {
149  av_log(s, AV_LOG_ERROR,
150  "Invalid sample rate: %d\n", par->sample_rate);
151  return AVERROR_INVALIDDATA;
152  }
153  if (par->codec_id == AV_CODEC_ID_AAC_LATM) {
154  /* Channels and sample_rate values are those prior to applying SBR
155  * and/or PS. */
156  par->channels = 0;
157  par->sample_rate = 0;
158  }
159  /* override bits_per_coded_sample for G.726 */
160  if (par->codec_id == AV_CODEC_ID_ADPCM_G726)
161  par->bits_per_coded_sample = par->bit_rate / par->sample_rate;
162 
163  return 0;
164 }
165 
166 enum AVCodecID ff_wav_codec_get_id(unsigned int tag, int bps)
167 {
168  enum AVCodecID id;
170  if (id <= 0)
171  return id;
172 
173  if (id == AV_CODEC_ID_PCM_S16LE)
174  id = ff_get_pcm_codec_id(bps, 0, 0, ~1);
175  else if (id == AV_CODEC_ID_PCM_F32LE)
176  id = ff_get_pcm_codec_id(bps, 1, 0, 0);
177 
178  if (id == AV_CODEC_ID_ADPCM_IMA_WAV && bps == 8)
180  return id;
181 }
182 
183 int ff_get_bmp_header(AVIOContext *pb, AVStream *st, uint32_t *size)
184 {
185  int tag1;
186  uint32_t size_ = avio_rl32(pb);
187  if (size)
188  *size = size_;
189  st->codecpar->width = avio_rl32(pb);
190  st->codecpar->height = (int32_t)avio_rl32(pb);
191  avio_rl16(pb); /* planes */
192  st->codecpar->bits_per_coded_sample = avio_rl16(pb); /* depth */
193  tag1 = avio_rl32(pb);
194  avio_rl32(pb); /* ImageSize */
195  avio_rl32(pb); /* XPelsPerMeter */
196  avio_rl32(pb); /* YPelsPerMeter */
197  avio_rl32(pb); /* ClrUsed */
198  avio_rl32(pb); /* ClrImportant */
199  return tag1;
200 }
201 
203 {
204  int64_t start, end, cur;
205  AVIOContext *pb = s->pb;
206 
207  start = avio_tell(pb);
208  end = start + size;
209 
210  while ((cur = avio_tell(pb)) >= 0 &&
211  cur <= end - 8 /* = tag + size */) {
212  uint32_t chunk_code;
213  int64_t chunk_size;
214  char key[5] = { 0 };
215  char *value;
216 
217  chunk_code = avio_rl32(pb);
218  chunk_size = avio_rl32(pb);
219 
220  if (chunk_size > end ||
221  end - chunk_size < cur ||
222  chunk_size == UINT_MAX) {
223  av_log(s, AV_LOG_WARNING, "too big INFO subchunk\n");
224  break;
225  }
226 
227  chunk_size += (chunk_size & 1);
228 
229  if (!chunk_code) {
230  if (chunk_size)
231  avio_skip(pb, chunk_size);
232  else if (pb->eof_reached) {
233  av_log(s, AV_LOG_WARNING, "truncated file\n");
234  return AVERROR_EOF;
235  }
236  continue;
237  }
238 
239  value = av_malloc(chunk_size + 1);
240  if (!value) {
241  av_log(s, AV_LOG_ERROR,
242  "out of memory, unable to read INFO tag\n");
243  return AVERROR(ENOMEM);
244  }
245 
246  AV_WL32(key, chunk_code);
247 
248  if (avio_read(pb, value, chunk_size) != chunk_size) {
249  av_free(value);
251  "premature end of file while reading INFO tag\n");
252  break;
253  }
254 
255  value[chunk_size] = 0;
256 
257  av_dict_set(&s->metadata, key, value, AV_DICT_DONT_STRDUP_VAL);
258  }
259 
260  return 0;
261 }
void * av_malloc(size_t size)
Allocate a block of size bytes with alignment suitable for all memory accesses (including vectors if ...
Definition: mem.c:62
Bytestream IO Context.
Definition: avio.h:104
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition: error.h:54
int ff_get_wav_header(AVFormatContext *s, AVIOContext *pb, AVCodecParameters *par, int size)
Definition: riffdec.c:82
int size
enum AVCodecID id
Definition: mxfenc.c:85
enum AVCodecID ff_codec_get_id(const AVCodecTag *tags, unsigned int tag)
Definition: utils.c:1983
static av_always_inline int ff_get_guid(AVIOContext *s, ff_asf_guid *g)
Definition: riff.h:95
#define AV_LOG_WARNING
Something somehow does not look correct.
Definition: log.h:130
#define FF_ARG_GUID(g)
Definition: riff.h:83
enum AVCodecID id
Definition: riff.h:74
enum AVCodecID codec_id
Specific type of the encoded data (the codec used).
Definition: avcodec.h:3483
av_log(ac->avr, AV_LOG_TRACE, "%d samples - audio_convert: %s to %s (%s)\, len, av_get_sample_fmt_name(ac->in_fmt), av_get_sample_fmt_name(ac->out_fmt), use_generic ? ac->func_descr_generic :ac->func_descr)
enum AVCodecID ff_wav_codec_get_id(unsigned int tag, int bps)
Definition: riffdec.c:166
This struct describes the properties of an encoded stream.
Definition: avcodec.h:3475
Format I/O context.
Definition: avformat.h:940
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:183
Public dictionary API.
uint8_t
#define FF_MEDIASUBTYPE_BASE_GUID
Definition: riff.h:87
int width
Video only.
Definition: avcodec.h:3525
uint32_t tag
Definition: movenc.c:854
#define AVERROR_EOF
End of file.
Definition: error.h:51
static av_always_inline int64_t avio_tell(AVIOContext *s)
ftell() equivalent for AVIOContext.
Definition: avio.h:295
uint64_t channel_layout
Audio only.
Definition: avcodec.h:3556
int avio_read(AVIOContext *s, unsigned char *buf, int size)
Read size bytes from AVIOContext into buf.
Definition: aviobuf.c:545
static void parse_waveformatex(AVIOContext *pb, AVCodecParameters *par)
Definition: riffdec.c:57
AVCodecID
Identify the syntax and semantics of the bitstream.
Definition: avcodec.h:193
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:124
AVDictionary * metadata
Metadata that applies to the whole file.
Definition: avformat.h:1148
void av_free(void *ptr)
Free a memory block which has been allocated with av_malloc(z)() or av_realloc(). ...
Definition: mem.c:190
error code definitions
unsigned int avio_rl32(AVIOContext *s)
Definition: aviobuf.c:665
#define AVERROR(e)
Definition: error.h:43
enum AVCodecID ff_codec_guid_get_id(const AVCodecGuid *guids, ff_asf_guid guid)
Definition: riffdec.c:40
enum AVMediaType codec_type
General type of the encoded data.
Definition: avcodec.h:3479
const AVCodecTag ff_codec_wav_tags[]
Definition: riff.c:374
int extradata_size
Size of the extradata content in bytes.
Definition: avcodec.h:3501
int bit_rate
The average bitrate of the encoded data (in bits per second).
Definition: avcodec.h:3512
int block_align
Audio only.
Definition: avcodec.h:3571
#define FFMIN(a, b)
Definition: common.h:66
#define AV_DICT_DONT_STRDUP_VAL
Take ownership of a value that&#39;s been allocated with av_malloc() and children.
Definition: dict.h:64
static av_always_inline int64_t avio_skip(AVIOContext *s, int64_t offset)
Skip given number of bytes forward.
Definition: avio.h:286
internal header for RIFF based (de)muxers do NOT include this in end user applications ...
int32_t
#define AV_RL32
Definition: intreadwrite.h:146
#define AV_EF_EXPLODE
Definition: avcodec.h:2681
uint8_t ff_asf_guid[16]
Definition: riff.h:71
Stream structure.
Definition: avformat.h:705
Libavcodec external API header.
AVIOContext * pb
I/O context.
Definition: avformat.h:982
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:68
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:1995
int sample_rate
Audio only.
Definition: avcodec.h:3564
unsigned int avio_rl16(AVIOContext *s)
Definition: aviobuf.c:649
Main libavformat public API header.
#define FF_PRI_GUID
Definition: riff.h:80
int error_recognition
Error recognition; higher values will detect more errors but may misdetect some more or less valid pa...
Definition: avformat.h:1170
unsigned bps
Definition: movenc.c:855
#define AV_INPUT_BUFFER_PADDING_SIZE
Required number of additionally allocated bytes at the end of the input bitstream for decoding...
Definition: avcodec.h:638
const AVCodecGuid ff_codec_wav_guids[]
Definition: riffdec.c:32
int eof_reached
true if eof reached
Definition: avio.h:132
int bits_per_coded_sample
Definition: avcodec.h:3514
uint8_t * extradata
Extra binary data needed for initializing the decoder, codec-dependent.
Definition: avcodec.h:3497
int channels
Audio only.
Definition: avcodec.h:3560
#define AV_WL32(p, val)
Definition: intreadwrite.h:263
int ff_read_riff_info(AVFormatContext *s, int64_t size)
Definition: riffdec.c:202
AVCodecParameters * codecpar
Definition: avformat.h:831
uint32_t codec_tag
Additional information about the codec (corresponds to the AVI FOURCC).
Definition: avcodec.h:3487
static av_always_inline int ff_guidcmp(const void *g1, const void *g2)
Definition: riff.h:90
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:211