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
|
/* Copyright (C) 2002 Jean-Marc Valin
File: speex_header.c
Describes the Speex header
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions
are met:
- Redistributions of source code must retain the above copyright
notice, this list of conditions and the following disclaimer.
- Redistributions in binary form must reproduce the above copyright
notice, this list of conditions and the following disclaimer in the
documentation and/or other materials provided with the distribution.
- Neither the name of the Xiph.org Foundation nor the names of its
contributors may be used to endorse or promote products derived from
this software without specific prior written permission.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR
CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "arch.h"
#include <speex/speex_header.h>
#include <speex/speex.h>
#include "os_support.h"
#ifndef NULL
#define NULL 0
#endif
/** Convert little endian */
static inline spx_int32_t le_int(spx_int32_t i)
{
#if !defined(__LITTLE_ENDIAN__) && ( defined(WORDS_BIGENDIAN) || defined(__BIG_ENDIAN__) )
spx_uint32_t ui, ret;
ui = i;
ret = ui>>24;
ret |= (ui>>8)&0x0000ff00;
ret |= (ui<<8)&0x00ff0000;
ret |= (ui<<24);
return ret;
#else
return i;
#endif
}
#define ENDIAN_SWITCH(x) {x=le_int(x);}
/*
typedef struct SpeexHeader {
char speex_string[8];
char speex_version[SPEEX_HEADER_VERSION_LENGTH];
int speex_version_id;
int header_size;
int rate;
int mode;
int mode_bitstream_version;
int nb_channels;
int bitrate;
int frame_size;
int vbr;
int frames_per_packet;
int extra_headers;
int reserved1;
int reserved2;
} SpeexHeader;
*/
void speex_init_header(SpeexHeader *header, int rate, int nb_channels, const SpeexMode *m)
{
int i;
const char *h="Speex ";
/*
strncpy(header->speex_string, "Speex ", 8);
strncpy(header->speex_version, SPEEX_VERSION, SPEEX_HEADER_VERSION_LENGTH-1);
header->speex_version[SPEEX_HEADER_VERSION_LENGTH-1]=0;
*/
for (i=0;i<8;i++)
header->speex_string[i]=h[i];
for (i=0;i<SPEEX_HEADER_VERSION_LENGTH-1 && SPEEX_VERSION[i];i++)
header->speex_version[i]=SPEEX_VERSION[i];
for (;i<SPEEX_HEADER_VERSION_LENGTH;i++)
header->speex_version[i]=0;
header->speex_version_id = 1;
header->header_size = sizeof(SpeexHeader);
header->rate = rate;
header->mode = m->modeID;
header->mode_bitstream_version = m->bitstream_version;
if (m->modeID<0)
speex_warning("This mode is meant to be used alone");
header->nb_channels = nb_channels;
header->bitrate = -1;
speex_mode_query(m, SPEEX_MODE_FRAME_SIZE, &header->frame_size);
header->vbr = 0;
header->frames_per_packet = 0;
header->extra_headers = 0;
header->reserved1 = 0;
header->reserved2 = 0;
}
char *speex_header_to_packet(SpeexHeader *header, int *size)
{
SpeexHeader *le_header;
le_header = (SpeexHeader*)speex_alloc(sizeof(SpeexHeader));
SPEEX_COPY(le_header, header, 1);
/*Make sure everything is now little-endian*/
ENDIAN_SWITCH(le_header->speex_version_id);
ENDIAN_SWITCH(le_header->header_size);
ENDIAN_SWITCH(le_header->rate);
ENDIAN_SWITCH(le_header->mode);
ENDIAN_SWITCH(le_header->mode_bitstream_version);
ENDIAN_SWITCH(le_header->nb_channels);
ENDIAN_SWITCH(le_header->bitrate);
ENDIAN_SWITCH(le_header->frame_size);
ENDIAN_SWITCH(le_header->vbr);
ENDIAN_SWITCH(le_header->frames_per_packet);
ENDIAN_SWITCH(le_header->extra_headers);
*size = sizeof(SpeexHeader);
return (char *)le_header;
}
SpeexHeader *speex_packet_to_header(char *packet, int size)
{
int i;
SpeexHeader *le_header;
const char *h = "Speex ";
for (i=0;i<8;i++)
if (packet[i]!=h[i])
{
speex_notify("This doesn't look like a Speex file");
return NULL;
}
/*FIXME: Do we allow larger headers?*/
if (size < (int)sizeof(SpeexHeader))
{
speex_notify("Speex header too small");
return NULL;
}
le_header = (SpeexHeader*)speex_alloc(sizeof(SpeexHeader));
SPEEX_COPY(le_header, (SpeexHeader*)packet, 1);
/*Make sure everything is converted correctly from little-endian*/
ENDIAN_SWITCH(le_header->speex_version_id);
ENDIAN_SWITCH(le_header->header_size);
ENDIAN_SWITCH(le_header->rate);
ENDIAN_SWITCH(le_header->mode);
ENDIAN_SWITCH(le_header->mode_bitstream_version);
ENDIAN_SWITCH(le_header->nb_channels);
ENDIAN_SWITCH(le_header->bitrate);
ENDIAN_SWITCH(le_header->frame_size);
ENDIAN_SWITCH(le_header->vbr);
ENDIAN_SWITCH(le_header->frames_per_packet);
ENDIAN_SWITCH(le_header->extra_headers);
return le_header;
}
void speex_header_free(void *ptr)
{
speex_free(ptr);
}
|
