1
/* Copyright (C) 2002 Jean-Marc Valin
3
Describes the Speex header
5
Redistribution and use in source and binary forms, with or without
6
modification, are permitted provided that the following conditions
9
- Redistributions of source code must retain the above copyright
10
notice, this list of conditions and the following disclaimer.
12
- Redistributions in binary form must reproduce the above copyright
13
notice, this list of conditions and the following disclaimer in the
14
documentation and/or other materials provided with the distribution.
16
- Neither the name of the Xiph.org Foundation nor the names of its
17
contributors may be used to endorse or promote products derived from
18
this software without specific prior written permission.
20
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
21
``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
22
LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
23
A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR
24
CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
25
EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
26
PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
27
PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
28
LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
29
NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
30
SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
39
#include <speex/speex_header.h>
40
#include <speex/speex.h>
41
#include "os_support.h"
47
/** Convert little endian */
48
static inline spx_int32_t le_int(spx_int32_t i)
50
#if !defined(__LITTLE_ENDIAN__) && ( defined(WORDS_BIGENDIAN) || defined(__BIG_ENDIAN__) )
54
ret |= (ui>>8)&0x0000ff00;
55
ret |= (ui<<8)&0x00ff0000;
63
#define ENDIAN_SWITCH(x) {x=le_int(x);}
67
typedef struct SpeexHeader {
69
char speex_version[SPEEX_HEADER_VERSION_LENGTH];
74
int mode_bitstream_version;
79
int frames_per_packet;
86
EXPORT void speex_init_header(SpeexHeader *header, int rate, int nb_channels, const SpeexMode *m)
89
const char *h="Speex ";
91
strncpy(header->speex_string, "Speex ", 8);
92
strncpy(header->speex_version, SPEEX_VERSION, SPEEX_HEADER_VERSION_LENGTH-1);
93
header->speex_version[SPEEX_HEADER_VERSION_LENGTH-1]=0;
96
header->speex_string[i]=h[i];
97
for (i=0;i<SPEEX_HEADER_VERSION_LENGTH-1 && SPEEX_VERSION[i];i++)
98
header->speex_version[i]=SPEEX_VERSION[i];
99
for (;i<SPEEX_HEADER_VERSION_LENGTH;i++)
100
header->speex_version[i]=0;
102
header->speex_version_id = 1;
103
header->header_size = sizeof(SpeexHeader);
106
header->mode = m->modeID;
107
header->mode_bitstream_version = m->bitstream_version;
109
speex_warning("This mode is meant to be used alone");
110
header->nb_channels = nb_channels;
111
header->bitrate = -1;
112
speex_mode_query(m, SPEEX_MODE_FRAME_SIZE, &header->frame_size);
115
header->frames_per_packet = 0;
116
header->extra_headers = 0;
117
header->reserved1 = 0;
118
header->reserved2 = 0;
121
EXPORT char *speex_header_to_packet(SpeexHeader *header, int *size)
123
SpeexHeader *le_header;
124
le_header = (SpeexHeader*)speex_alloc(sizeof(SpeexHeader));
126
SPEEX_COPY(le_header, header, 1);
128
/*Make sure everything is now little-endian*/
129
ENDIAN_SWITCH(le_header->speex_version_id);
130
ENDIAN_SWITCH(le_header->header_size);
131
ENDIAN_SWITCH(le_header->rate);
132
ENDIAN_SWITCH(le_header->mode);
133
ENDIAN_SWITCH(le_header->mode_bitstream_version);
134
ENDIAN_SWITCH(le_header->nb_channels);
135
ENDIAN_SWITCH(le_header->bitrate);
136
ENDIAN_SWITCH(le_header->frame_size);
137
ENDIAN_SWITCH(le_header->vbr);
138
ENDIAN_SWITCH(le_header->frames_per_packet);
139
ENDIAN_SWITCH(le_header->extra_headers);
141
*size = sizeof(SpeexHeader);
142
return (char *)le_header;
145
EXPORT SpeexHeader *speex_packet_to_header(char *packet, int size)
148
SpeexHeader *le_header;
149
const char *h = "Speex ";
153
speex_notify("This doesn't look like a Speex file");
157
/*FIXME: Do we allow larger headers?*/
158
if (size < (int)sizeof(SpeexHeader))
160
speex_notify("Speex header too small");
164
le_header = (SpeexHeader*)speex_alloc(sizeof(SpeexHeader));
166
SPEEX_COPY(le_header, (SpeexHeader*)packet, 1);
168
/*Make sure everything is converted correctly from little-endian*/
169
ENDIAN_SWITCH(le_header->speex_version_id);
170
ENDIAN_SWITCH(le_header->header_size);
171
ENDIAN_SWITCH(le_header->rate);
172
ENDIAN_SWITCH(le_header->mode);
173
ENDIAN_SWITCH(le_header->mode_bitstream_version);
174
ENDIAN_SWITCH(le_header->nb_channels);
175
ENDIAN_SWITCH(le_header->bitrate);
176
ENDIAN_SWITCH(le_header->frame_size);
177
ENDIAN_SWITCH(le_header->vbr);
178
ENDIAN_SWITCH(le_header->frames_per_packet);
179
ENDIAN_SWITCH(le_header->extra_headers);
181
if (le_header->mode >= SPEEX_NB_MODES || le_header->mode < 0)
183
speex_notify("Invalid mode specified in Speex header");
184
speex_free (le_header);
188
if (le_header->nb_channels>2)
189
le_header->nb_channels = 2;
190
if (le_header->nb_channels<1)
191
le_header->nb_channels = 1;
197
EXPORT void speex_header_free(void *ptr)