This patch adds 'const' tags to a number of Asterisk APIs where they are appropriate (where the API already demanded that the function argument not be modified, but the compiler was not informed of that fact). The list includes: - CLI command handlers - CLI command handler arguments - AGI command handlers - AGI command handler arguments - Dialplan application handler arguments - Speech engine API function arguments In addition, various file-scope and function-scope constant arrays got 'const' and/or 'static' qualifiers where they were missing. Review: https://reviewboard.asterisk.org/r/251/ git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@196072 65c4cc65-6c06-0410-ace0-fbb531ad65f3
173 lines
4.6 KiB
C
173 lines
4.6 KiB
C
/*
|
|
* Asterisk -- An open source telephony toolkit.
|
|
*
|
|
* Copyright (C) 1999 - 2005, Digium, Inc.
|
|
*
|
|
* Mark Spencer <markster@digium.com>
|
|
*
|
|
* See http://www.asterisk.org for more information about
|
|
* the Asterisk project. Please do not directly contact
|
|
* any of the maintainers of this project for assistance;
|
|
* the project provides a web site, mailing lists and IRC
|
|
* channels for your use.
|
|
*
|
|
* This program is free software, distributed under the terms of
|
|
* the GNU General Public License Version 2. See the LICENSE file
|
|
* at the top of the source tree.
|
|
*/
|
|
|
|
/*! \file
|
|
*
|
|
* \brief Save to raw, headerless GSM data.
|
|
* \arg File name extension: gsm
|
|
* \ingroup formats
|
|
*/
|
|
|
|
#include "asterisk.h"
|
|
|
|
ASTERISK_FILE_VERSION(__FILE__, "$Revision$")
|
|
|
|
#include "asterisk/mod_format.h"
|
|
#include "asterisk/module.h"
|
|
#include "asterisk/endian.h"
|
|
|
|
#include "msgsm.h"
|
|
|
|
/* Some Ideas for this code came from makegsme.c by Jeffrey Chilton */
|
|
|
|
/* Portions of the conversion code are by guido@sienanet.it */
|
|
|
|
#define GSM_FRAME_SIZE 33
|
|
#define GSM_SAMPLES 160
|
|
|
|
/* silent gsm frame */
|
|
/* begin binary data: */
|
|
static const char gsm_silence[] = /* 33 */
|
|
{0xD8,0x20,0xA2,0xE1,0x5A,0x50,0x00,0x49,0x24,0x92,0x49,0x24,0x50,0x00,0x49
|
|
,0x24,0x92,0x49,0x24,0x50,0x00,0x49,0x24,0x92,0x49,0x24,0x50,0x00,0x49,0x24
|
|
,0x92,0x49,0x24};
|
|
/* end binary data. size = 33 bytes */
|
|
|
|
static struct ast_frame *gsm_read(struct ast_filestream *s, int *whennext)
|
|
{
|
|
int res;
|
|
|
|
s->fr.frametype = AST_FRAME_VOICE;
|
|
s->fr.subclass = AST_FORMAT_GSM;
|
|
AST_FRAME_SET_BUFFER(&(s->fr), s->buf, AST_FRIENDLY_OFFSET, GSM_FRAME_SIZE)
|
|
s->fr.mallocd = 0;
|
|
if ((res = fread(s->fr.data.ptr, 1, GSM_FRAME_SIZE, s->f)) != GSM_FRAME_SIZE) {
|
|
if (res)
|
|
ast_log(LOG_WARNING, "Short read (%d) (%s)!\n", res, strerror(errno));
|
|
return NULL;
|
|
}
|
|
*whennext = s->fr.samples = GSM_SAMPLES;
|
|
return &s->fr;
|
|
}
|
|
|
|
static int gsm_write(struct ast_filestream *fs, struct ast_frame *f)
|
|
{
|
|
int res;
|
|
unsigned char gsm[2*GSM_FRAME_SIZE];
|
|
|
|
if (f->frametype != AST_FRAME_VOICE) {
|
|
ast_log(LOG_WARNING, "Asked to write non-voice frame!\n");
|
|
return -1;
|
|
}
|
|
if (f->subclass != AST_FORMAT_GSM) {
|
|
ast_log(LOG_WARNING, "Asked to write non-GSM frame (%d)!\n", f->subclass);
|
|
return -1;
|
|
}
|
|
if (!(f->datalen % 65)) {
|
|
/* This is in MSGSM format, need to be converted */
|
|
int len=0;
|
|
while(len < f->datalen) {
|
|
conv65(f->data.ptr + len, gsm);
|
|
if ((res = fwrite(gsm, 1, 2*GSM_FRAME_SIZE, fs->f)) != 2*GSM_FRAME_SIZE) {
|
|
ast_log(LOG_WARNING, "Bad write (%d/66): %s\n", res, strerror(errno));
|
|
return -1;
|
|
}
|
|
len += 65;
|
|
}
|
|
} else {
|
|
if (f->datalen % GSM_FRAME_SIZE) {
|
|
ast_log(LOG_WARNING, "Invalid data length, %d, should be multiple of 33\n", f->datalen);
|
|
return -1;
|
|
}
|
|
if ((res = fwrite(f->data.ptr, 1, f->datalen, fs->f)) != f->datalen) {
|
|
ast_log(LOG_WARNING, "Bad write (%d/33): %s\n", res, strerror(errno));
|
|
return -1;
|
|
}
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int gsm_seek(struct ast_filestream *fs, off_t sample_offset, int whence)
|
|
{
|
|
off_t offset=0,min,cur,max,distance;
|
|
|
|
min = 0;
|
|
cur = ftello(fs->f);
|
|
fseeko(fs->f, 0, SEEK_END);
|
|
max = ftello(fs->f);
|
|
/* have to fudge to frame here, so not fully to sample */
|
|
distance = (sample_offset/GSM_SAMPLES) * GSM_FRAME_SIZE;
|
|
if(whence == SEEK_SET)
|
|
offset = distance;
|
|
else if(whence == SEEK_CUR || whence == SEEK_FORCECUR)
|
|
offset = distance + cur;
|
|
else if(whence == SEEK_END)
|
|
offset = max - distance;
|
|
/* Always protect against seeking past the begining. */
|
|
offset = (offset < min)?min:offset;
|
|
if (whence != SEEK_FORCECUR) {
|
|
offset = (offset > max)?max:offset;
|
|
} else if (offset > max) {
|
|
int i;
|
|
fseeko(fs->f, 0, SEEK_END);
|
|
for (i=0; i< (offset - max) / GSM_FRAME_SIZE; i++) {
|
|
if (!fwrite(gsm_silence, 1, GSM_FRAME_SIZE, fs->f)) {
|
|
ast_log(LOG_WARNING, "fwrite() failed: %s\n", strerror(errno));
|
|
}
|
|
}
|
|
}
|
|
return fseeko(fs->f, offset, SEEK_SET);
|
|
}
|
|
|
|
static int gsm_trunc(struct ast_filestream *fs)
|
|
{
|
|
return ftruncate(fileno(fs->f), ftello(fs->f));
|
|
}
|
|
|
|
static off_t gsm_tell(struct ast_filestream *fs)
|
|
{
|
|
off_t offset = ftello(fs->f);
|
|
return (offset/GSM_FRAME_SIZE)*GSM_SAMPLES;
|
|
}
|
|
|
|
static const struct ast_format gsm_f = {
|
|
.name = "gsm",
|
|
.exts = "gsm",
|
|
.format = AST_FORMAT_GSM,
|
|
.write = gsm_write,
|
|
.seek = gsm_seek,
|
|
.trunc = gsm_trunc,
|
|
.tell = gsm_tell,
|
|
.read = gsm_read,
|
|
.buf_size = 2*GSM_FRAME_SIZE + AST_FRIENDLY_OFFSET, /* 2 gsm frames */
|
|
};
|
|
|
|
static int load_module(void)
|
|
{
|
|
if (ast_format_register(&gsm_f))
|
|
return AST_MODULE_LOAD_FAILURE;
|
|
return AST_MODULE_LOAD_SUCCESS;
|
|
}
|
|
|
|
static int unload_module(void)
|
|
{
|
|
return ast_format_unregister(gsm_f.name);
|
|
}
|
|
|
|
AST_MODULE_INFO_STANDARD(ASTERISK_GPL_KEY, "Raw GSM data");
|