1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
|
/*
* RIFF demuxing functions and data
* Copyright (c) 2000 Fabrice Bellard
*
* This file is part of Libav.
*
* Libav is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* Libav is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with Libav; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "libavutil/dict.h"
#include "libavutil/error.h"
#include "libavutil/log.h"
#include "libavutil/mathematics.h"
#include "libavcodec/avcodec.h"
#include "libavcodec/bytestream.h"
#include "avformat.h"
#include "avio_internal.h"
#include "riff.h"
const AVCodecGuid ff_codec_wav_guids[] = {
{ AV_CODEC_ID_AC3, { 0x2C, 0x80, 0x6D, 0xE0, 0x46, 0xDB, 0xCF, 0x11, 0xB4, 0xD1, 0x00, 0x80, 0x5F, 0x6C, 0xBB, 0xEA } },
{ AV_CODEC_ID_ATRAC3P, { 0xBF, 0xAA, 0x23, 0xE9, 0x58, 0xCB, 0x71, 0x44, 0xA1, 0x19, 0xFF, 0xFA, 0x01, 0xE4, 0xCE, 0x62 } },
{ AV_CODEC_ID_EAC3, { 0xAF, 0x87, 0xFB, 0xA7, 0x02, 0x2D, 0xFB, 0x42, 0xA4, 0xD4, 0x05, 0xCD, 0x93, 0x84, 0x3B, 0xDD } },
{ AV_CODEC_ID_MP2, { 0x2B, 0x80, 0x6D, 0xE0, 0x46, 0xDB, 0xCF, 0x11, 0xB4, 0xD1, 0x00, 0x80, 0x5F, 0x6C, 0xBB, 0xEA } },
{ AV_CODEC_ID_NONE }
};
enum AVCodecID ff_codec_guid_get_id(const AVCodecGuid *guids, ff_asf_guid guid)
{
int i;
for (i = 0; guids[i].id != AV_CODEC_ID_NONE; i++)
if (!ff_guidcmp(guids[i].guid, guid))
return guids[i].id;
return AV_CODEC_ID_NONE;
}
/* We could be given one of the three possible structures here:
* WAVEFORMAT, PCMWAVEFORMAT or WAVEFORMATEX. Each structure
* is an expansion of the previous one with the fields added
* at the bottom. PCMWAVEFORMAT adds 'WORD wBitsPerSample' and
* WAVEFORMATEX adds 'WORD cbSize' and basically makes itself
* an openended structure.
*/
static void parse_waveformatex(AVIOContext *pb, AVCodecParameters *par)
{
ff_asf_guid subformat;
int bps;
bps = avio_rl16(pb);
if (bps)
par->bits_per_coded_sample = bps;
par->channel_layout = avio_rl32(pb); /* dwChannelMask */
ff_get_guid(pb, &subformat);
if (!memcmp(subformat + 4,
(const uint8_t[]){ FF_MEDIASUBTYPE_BASE_GUID }, 12)) {
par->codec_tag = AV_RL32(subformat);
par->codec_id = ff_wav_codec_get_id(par->codec_tag,
par->bits_per_coded_sample);
} else {
par->codec_id = ff_codec_guid_get_id(ff_codec_wav_guids, subformat);
if (!par->codec_id)
av_log(pb, AV_LOG_WARNING,
"unknown subformat:"FF_PRI_GUID"\n",
FF_ARG_GUID(subformat));
}
}
int ff_get_wav_header(AVFormatContext *s, AVIOContext *pb,
AVCodecParameters *par, int size)
{
int id;
uint64_t bitrate;
if (size < 14)
return AVERROR_INVALIDDATA;
id = avio_rl16(pb);
par->codec_type = AVMEDIA_TYPE_AUDIO;
par->channels = avio_rl16(pb);
par->sample_rate = avio_rl32(pb);
bitrate = avio_rl32(pb) * 8;
par->block_align = avio_rl16(pb);
if (size == 14) { /* We're dealing with plain vanilla WAVEFORMAT */
par->bits_per_coded_sample = 8;
} else
par->bits_per_coded_sample = avio_rl16(pb);
if (id == 0xFFFE) {
par->codec_tag = 0;
} else {
par->codec_tag = id;
par->codec_id = ff_wav_codec_get_id(id, par->bits_per_coded_sample);
}
if (size >= 18) { /* We're obviously dealing with WAVEFORMATEX */
int cbSize = avio_rl16(pb); /* cbSize */
size -= 18;
cbSize = FFMIN(size, cbSize);
if (cbSize >= 22 && id == 0xfffe) { /* WAVEFORMATEXTENSIBLE */
parse_waveformatex(pb, par);
cbSize -= 22;
size -= 22;
}
par->extradata_size = cbSize;
if (cbSize > 0) {
av_free(par->extradata);
par->extradata = av_mallocz(par->extradata_size +
AV_INPUT_BUFFER_PADDING_SIZE);
if (!par->extradata)
return AVERROR(ENOMEM);
avio_read(pb, par->extradata, par->extradata_size);
size -= cbSize;
}
/* It is possible for the chunk to contain garbage at the end */
if (size > 0)
avio_skip(pb, size);
}
if (bitrate > INT_MAX) {
if (s->error_recognition & AV_EF_EXPLODE) {
av_log(s, AV_LOG_ERROR,
"The bitrate %"PRIu64" is too large.\n",
bitrate);
return AVERROR_INVALIDDATA;
} else {
av_log(s, AV_LOG_WARNING,
"The bitrate %"PRIu64" is too large, resetting to 0.",
bitrate);
par->bit_rate = 0;
}
} else {
par->bit_rate = bitrate;
}
if (par->sample_rate <= 0) {
av_log(s, AV_LOG_ERROR,
"Invalid sample rate: %d\n", par->sample_rate);
return AVERROR_INVALIDDATA;
}
if (par->codec_id == AV_CODEC_ID_AAC_LATM) {
/* Channels and sample_rate values are those prior to applying SBR
* and/or PS. */
par->channels = 0;
par->sample_rate = 0;
}
/* override bits_per_coded_sample for G.726 */
if (par->codec_id == AV_CODEC_ID_ADPCM_G726)
par->bits_per_coded_sample = par->bit_rate / par->sample_rate;
return 0;
}
enum AVCodecID ff_wav_codec_get_id(unsigned int tag, int bps)
{
enum AVCodecID id;
id = ff_codec_get_id(ff_codec_wav_tags, tag);
if (id <= 0)
return id;
if (id == AV_CODEC_ID_PCM_S16LE)
id = ff_get_pcm_codec_id(bps, 0, 0, ~1);
else if (id == AV_CODEC_ID_PCM_F32LE)
id = ff_get_pcm_codec_id(bps, 1, 0, 0);
if (id == AV_CODEC_ID_ADPCM_IMA_WAV && bps == 8)
id = AV_CODEC_ID_PCM_ZORK;
return id;
}
int ff_get_bmp_header(AVIOContext *pb, AVStream *st, uint32_t *size)
{
int tag1;
uint32_t size_ = avio_rl32(pb);
if (size)
*size = size_;
st->codecpar->width = avio_rl32(pb);
st->codecpar->height = (int32_t)avio_rl32(pb);
avio_rl16(pb); /* planes */
st->codecpar->bits_per_coded_sample = avio_rl16(pb); /* depth */
tag1 = avio_rl32(pb);
avio_rl32(pb); /* ImageSize */
avio_rl32(pb); /* XPelsPerMeter */
avio_rl32(pb); /* YPelsPerMeter */
avio_rl32(pb); /* ClrUsed */
avio_rl32(pb); /* ClrImportant */
return tag1;
}
int ff_read_riff_info(AVFormatContext *s, int64_t size)
{
int64_t start, end, cur;
AVIOContext *pb = s->pb;
start = avio_tell(pb);
end = start + size;
while ((cur = avio_tell(pb)) >= 0 &&
cur <= end - 8 /* = tag + size */) {
uint32_t chunk_code;
int64_t chunk_size;
char key[5] = { 0 };
char *value;
chunk_code = avio_rl32(pb);
chunk_size = avio_rl32(pb);
if (chunk_size > end ||
end - chunk_size < cur ||
chunk_size == UINT_MAX) {
av_log(s, AV_LOG_WARNING, "too big INFO subchunk\n");
break;
}
chunk_size += (chunk_size & 1);
if (!chunk_code) {
if (chunk_size)
avio_skip(pb, chunk_size);
else if (pb->eof_reached) {
av_log(s, AV_LOG_WARNING, "truncated file\n");
return AVERROR_EOF;
}
continue;
}
value = av_malloc(chunk_size + 1);
if (!value) {
av_log(s, AV_LOG_ERROR,
"out of memory, unable to read INFO tag\n");
return AVERROR(ENOMEM);
}
AV_WL32(key, chunk_code);
if (avio_read(pb, value, chunk_size) != chunk_size) {
av_free(value);
av_log(s, AV_LOG_WARNING,
"premature end of file while reading INFO tag\n");
break;
}
value[chunk_size] = 0;
av_dict_set(&s->metadata, key, value, AV_DICT_DONT_STRDUP_VAL);
}
return 0;
}
|
