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
|
/***************************************************************************
* __________ __ ___.
* Open \______ \ ____ ____ | | _\_ |__ _______ ___
* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
* \/ \/ \/ \/ \/
* $Id$
*
* Copyright (C) 2005 Dave Chapman
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
* KIND, either express or implied.
*
****************************************************************************/
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <ctype.h>
#include <inttypes.h>
#include "system.h"
#include "metadata.h"
#include "metadata_common.h"
#include "metadata_parsers.h"
#include "logf.h"
# define AV_WL32(p, d) do { \
((uint8_t*)(p))[0] = (d); \
((uint8_t*)(p))[1] = (d)>>8; \
((uint8_t*)(p))[2] = (d)>>16; \
((uint8_t*)(p))[3] = (d)>>24; \
} while(0)
# define AV_WL16(p, d) do { \
((uint8_t*)(p))[0] = (d); \
((uint8_t*)(p))[1] = (d)>>8; \
} while(0)
enum
{
WAVE_FORMAT_PCM = 0x0001, /* Microsoft PCM Format */
WAVE_FORMAT_ADPCM = 0x0002, /* Microsoft ADPCM Format */
WAVE_FORMAT_IEEE_FLOAT = 0x0003, /* IEEE Float */
WAVE_FORMAT_ALAW = 0x0006, /* Microsoft ALAW */
WAVE_FORMAT_MULAW = 0x0007, /* Microsoft MULAW */
WAVE_FORMAT_DVI_ADPCM = 0x0011, /* Intel's DVI ADPCM */
WAVE_FORMAT_DIALOGIC_OKI_ADPCM = 0x0017, /* Dialogic OKI ADPCM */
WAVE_FORMAT_YAMAHA_ADPCM = 0x0020, /* Yamaha ADPCM */
WAVE_FORMAT_XBOX_ADPCM = 0x0069, /* XBOX ADPCM */
IBM_FORMAT_MULAW = 0x0101, /* same as WAVE_FORMAT_MULAW */
IBM_FORMAT_ALAW = 0x0102, /* same as WAVE_FORMAT_ALAW */
WAVE_FORMAT_ATRAC3 = 0x0270, /* Atrac3 stream */
WAVE_FORMAT_SWF_ADPCM = 0x5346, /* Adobe SWF ADPCM */
};
struct wave_fmt {
unsigned int formattag;
unsigned long channels;
unsigned int blockalign;
unsigned long bitspersample;
unsigned int samplesperblock;
unsigned long numbytes;
};
static unsigned long get_totalsamples(struct wave_fmt *fmt, struct mp3entry* id3)
{
unsigned long totalsamples = 0;
switch (fmt->formattag)
{
case WAVE_FORMAT_PCM:
case WAVE_FORMAT_IEEE_FLOAT:
case WAVE_FORMAT_ALAW:
case WAVE_FORMAT_MULAW:
case IBM_FORMAT_ALAW:
case IBM_FORMAT_MULAW:
totalsamples =
fmt->numbytes / ((((fmt->bitspersample - 1) / 8) + 1) * fmt->channels);
break;
case WAVE_FORMAT_ADPCM:
case WAVE_FORMAT_DVI_ADPCM:
case WAVE_FORMAT_XBOX_ADPCM:
totalsamples = (fmt->numbytes / fmt->blockalign) * fmt->samplesperblock;
break;
case WAVE_FORMAT_YAMAHA_ADPCM:
if (fmt->samplesperblock == 0)
{
if (fmt->blockalign == ((id3->frequency / 60) + 4) * fmt->channels)
fmt->samplesperblock = id3->frequency / 30;
else
fmt->samplesperblock = fmt->blockalign * 2 / fmt->channels;
}
totalsamples = (fmt->numbytes / fmt->blockalign) * fmt->samplesperblock;
break;
case WAVE_FORMAT_DIALOGIC_OKI_ADPCM:
totalsamples = 2 * fmt->numbytes;
break;
case WAVE_FORMAT_SWF_ADPCM:
if (fmt->samplesperblock == 0)
fmt->samplesperblock = (((fmt->blockalign << 3) - 2) / fmt->channels - 22)
/ fmt->bitspersample;
totalsamples = (fmt->numbytes / fmt->blockalign) * fmt->samplesperblock;
break;
default:
totalsamples = 0;
break;
}
return totalsamples;
}
bool get_wave_metadata(int fd, struct mp3entry* id3)
{
/* Use the trackname part of the id3 structure as a temporary buffer */
unsigned char* buf = (unsigned char *)id3->path;
struct wave_fmt fmt;
unsigned long totalsamples = 0;
unsigned long offset = 0;
int read_bytes;
int i;
memset(&fmt, 0, sizeof(struct wave_fmt));
/* get RIFF chunk header */
if ((lseek(fd, 0, SEEK_SET) < 0) || (read(fd, buf, 12) < 12))
{
return false;
}
offset += 12;
if ((memcmp(buf, "RIFF", 4) != 0) || (memcmp(&buf[8], "WAVE", 4) != 0))
{
DEBUGF("metadata error: missing riff header.\n");
return false;
}
/* iterate over WAVE chunks until 'data' chunk */
while (true)
{
/* get chunk header */
if (read(fd, buf, 8) < 8)
return false;
offset += 8;
/* chunkSize */
i = get_long_le(&buf[4]);
if (memcmp(buf, "fmt ", 4) == 0)
{
/* get rest of chunk */
if (i < 16)
return false;
read_bytes = 16;
if (i > 19)
read_bytes = 20;
if (read(fd, buf, read_bytes) != read_bytes)
return false;
offset += read_bytes;
i -= read_bytes;
/* wFormatTag */
fmt.formattag = buf[0] | (buf[1] << 8);
/* wChannels */
fmt.channels = buf[2] | (buf[3] << 8);
/* dwSamplesPerSec */
id3->frequency = get_long_le(&buf[4]);
/* dwAvgBytesPerSec */
id3->bitrate = (get_long_le(&buf[8]) * 8) / 1000;
/* wBlockAlign */
fmt.blockalign = buf[12] | (buf[13] << 8);
id3->bytesperframe = fmt.blockalign;
/* wBitsPerSample */
fmt.bitspersample = buf[14] | (buf[15] << 8);
if (read_bytes > 19)
{
/* wSamplesPerBlock */
fmt.samplesperblock = buf[18] | (buf[19] << 8);
}
/* Check for ATRAC3 stream */
if (fmt.formattag == WAVE_FORMAT_ATRAC3)
{
int jsflag = 0;
if(id3->bitrate == 66 || id3->bitrate == 94)
jsflag = 1;
id3->extradata_size = 14;
id3->channels = 2;
id3->codectype = AFMT_OMA_ATRAC3;
/* Store the extradata for the codec */
AV_WL16(&id3->id3v2buf[0], 1); // always 1
AV_WL32(&id3->id3v2buf[2], id3->frequency); // samples rate
AV_WL16(&id3->id3v2buf[6], jsflag); // coding mode
AV_WL16(&id3->id3v2buf[8], jsflag); // coding mode
AV_WL16(&id3->id3v2buf[10], 1); // always 1
AV_WL16(&id3->id3v2buf[12], 0); // always 0
}
}
else if (memcmp(buf, "data", 4) == 0)
{
fmt.numbytes = i;
if (fmt.formattag == WAVE_FORMAT_ATRAC3)
id3->first_frame_offset = offset;
break;
}
else if (memcmp(buf, "fact", 4) == 0)
{
/* dwSampleLength */
if (i >= 4)
{
/* get rest of chunk */
if (read(fd, buf, 4) < 4)
return false;
offset += 4;
i -= 4;
totalsamples = get_long_le(buf);
}
}
/* seek to next chunk (even chunk sizes must be padded) */
if (i & 0x01)
i++;
if(lseek(fd, i, SEEK_CUR) < 0)
return false;
offset += i;
}
if ((fmt.numbytes == 0) || (fmt.channels == 0) || (fmt.blockalign == 0))
{
DEBUGF("metadata error: numbytes, channels, or blockalign is 0.\n");
return false;
}
if (totalsamples == 0)
{
totalsamples = get_totalsamples(&fmt, id3);
}
id3->vbr = false; /* All WAV files are CBR */
id3->filesize = filesize(fd);
/* Calculate track length (in ms) and estimate the bitrate (in kbit/s) */
if(id3->codectype != AFMT_OMA_ATRAC3)
id3->length = ((int64_t) totalsamples * 1000) / id3->frequency;
else
id3->length = ((id3->filesize - id3->first_frame_offset) * 8) / id3->bitrate;
return true;
}
|
