290 lines
6.9 KiB
C
290 lines
6.9 KiB
C
/*
|
|
* Asterisk -- An open source telephony toolkit.
|
|
*
|
|
* Copyright (c) 2004 - 2005, inAccess Networks
|
|
*
|
|
* Michael Manousos <manousos@inaccessnetworks.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 Headerless G.726 (16/24/32/40kbps) data format for Asterisk.
|
|
*
|
|
* File name extensions:
|
|
* \arg 40 kbps: g726-40
|
|
* \arg 32 kbps: g726-32
|
|
* \arg 24 kbps: g726-24
|
|
* \arg 16 kbps: g726-16
|
|
* \ingroup formats
|
|
*/
|
|
|
|
/*** MODULEINFO
|
|
<support_level>core</support_level>
|
|
***/
|
|
|
|
#include "asterisk.h"
|
|
|
|
#include "asterisk/mod_format.h"
|
|
#include "asterisk/module.h"
|
|
#include "asterisk/endian.h"
|
|
#include "asterisk/format_cache.h"
|
|
|
|
#define RATE_40 0
|
|
#define RATE_32 1
|
|
#define RATE_24 2
|
|
#define RATE_16 3
|
|
|
|
/* We can only read/write chunks of FRAME_TIME ms G.726 data */
|
|
#define FRAME_TIME 10 /* 10 ms size */
|
|
|
|
#define BUF_SIZE (5*FRAME_TIME) /* max frame size in bytes ? */
|
|
/* Frame sizes in bytes */
|
|
static int frame_size[4] = {
|
|
FRAME_TIME * 5,
|
|
FRAME_TIME * 4,
|
|
FRAME_TIME * 3,
|
|
FRAME_TIME * 2
|
|
};
|
|
|
|
struct g726_desc {
|
|
int rate; /* RATE_* defines */
|
|
};
|
|
|
|
/*
|
|
* Rate dependant format functions (open, rewrite)
|
|
*/
|
|
static int g726_open(struct ast_filestream *tmp, int rate)
|
|
{
|
|
struct g726_desc *s = (struct g726_desc *)tmp->_private;
|
|
s->rate = rate;
|
|
ast_debug(1, "Created filestream G.726-%dk.\n", 40 - s->rate * 8);
|
|
return 0;
|
|
}
|
|
|
|
static int g726_40_open(struct ast_filestream *s)
|
|
{
|
|
return g726_open(s, RATE_40);
|
|
}
|
|
|
|
static int g726_32_open(struct ast_filestream *s)
|
|
{
|
|
return g726_open(s, RATE_32);
|
|
}
|
|
|
|
static int g726_24_open(struct ast_filestream *s)
|
|
{
|
|
return g726_open(s, RATE_24);
|
|
}
|
|
|
|
static int g726_16_open(struct ast_filestream *s)
|
|
{
|
|
return g726_open(s, RATE_16);
|
|
}
|
|
|
|
static int g726_40_rewrite(struct ast_filestream *s, const char *comment)
|
|
{
|
|
return g726_open(s, RATE_40);
|
|
}
|
|
|
|
static int g726_32_rewrite(struct ast_filestream *s, const char *comment)
|
|
{
|
|
return g726_open(s, RATE_32);
|
|
}
|
|
|
|
static int g726_24_rewrite(struct ast_filestream *s, const char *comment)
|
|
{
|
|
return g726_open(s, RATE_24);
|
|
}
|
|
|
|
static int g726_16_rewrite(struct ast_filestream *s, const char *comment)
|
|
{
|
|
return g726_open(s, RATE_16);
|
|
}
|
|
|
|
/*
|
|
* Rate independent format functions (read, write)
|
|
*/
|
|
|
|
static struct ast_frame *g726_read(struct ast_filestream *s, int *whennext)
|
|
{
|
|
size_t res;
|
|
struct g726_desc *fs = (struct g726_desc *)s->_private;
|
|
|
|
/* Send a frame from the file to the appropriate channel */
|
|
AST_FRAME_SET_BUFFER(&s->fr, s->buf, AST_FRIENDLY_OFFSET, frame_size[fs->rate]);
|
|
s->fr.samples = 8 * FRAME_TIME;
|
|
if ((res = fread(s->fr.data.ptr, 1, s->fr.datalen, s->f)) != s->fr.datalen) {
|
|
if (res) {
|
|
ast_log(LOG_WARNING, "Short read of %s data (expected %d bytes, read %zu): %s\n",
|
|
ast_format_get_name(s->fr.subclass.format), s->fr.datalen, res,
|
|
strerror(errno));
|
|
}
|
|
return NULL;
|
|
}
|
|
*whennext = s->fr.samples;
|
|
return &s->fr;
|
|
}
|
|
|
|
static int g726_write(struct ast_filestream *s, struct ast_frame *f)
|
|
{
|
|
int res;
|
|
struct g726_desc *fs = (struct g726_desc *)s->_private;
|
|
|
|
if (f->datalen % frame_size[fs->rate]) {
|
|
ast_log(LOG_WARNING, "Invalid data length %d, should be multiple of %d\n",
|
|
f->datalen, frame_size[fs->rate]);
|
|
return -1;
|
|
}
|
|
if ((res = fwrite(f->data.ptr, 1, f->datalen, s->f)) != f->datalen) {
|
|
ast_log(LOG_WARNING, "Bad write (%d/%d): %s\n",
|
|
res, frame_size[fs->rate], strerror(errno));
|
|
return -1;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int g726_seek(struct ast_filestream *fs, off_t sample_offset, int whence)
|
|
{
|
|
off_t offset = 0, min = 0, cur, max, distance;
|
|
|
|
if ((cur = ftello(fs->f)) < 0) {
|
|
ast_log(AST_LOG_WARNING, "Unable to determine current position in g726 filestream %p: %s\n", fs, strerror(errno));
|
|
return -1;
|
|
}
|
|
|
|
if (fseeko(fs->f, 0, SEEK_END) < 0) {
|
|
ast_log(AST_LOG_WARNING, "Unable to seek to end of g726 filestream %p: %s\n", fs, strerror(errno));
|
|
return -1;
|
|
}
|
|
|
|
if ((max = ftello(fs->f)) < 0) {
|
|
ast_log(AST_LOG_WARNING, "Unable to determine max position in g726 filestream %p: %s\n", fs, strerror(errno));
|
|
return -1;
|
|
}
|
|
|
|
/* have to fudge to frame here, so not fully to sample */
|
|
distance = sample_offset / 2;
|
|
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;
|
|
}
|
|
|
|
if (whence != SEEK_FORCECUR) {
|
|
offset = offset > max ? max : offset;
|
|
offset = offset < min ? min : offset;
|
|
}
|
|
return fseeko(fs->f, offset, SEEK_SET);
|
|
}
|
|
|
|
static int g726_trunc(struct ast_filestream *fs)
|
|
{
|
|
return -1;
|
|
}
|
|
|
|
static off_t g726_tell(struct ast_filestream *fs)
|
|
{
|
|
return ftello(fs->f) << 1;
|
|
}
|
|
|
|
static struct ast_format_def f_def[] = {
|
|
{
|
|
.name = "g726-40",
|
|
.exts = "g726-40",
|
|
.open = g726_40_open,
|
|
.rewrite = g726_40_rewrite,
|
|
.write = g726_write,
|
|
.seek = g726_seek,
|
|
.trunc = g726_trunc,
|
|
.tell = g726_tell,
|
|
.read = g726_read,
|
|
.buf_size = BUF_SIZE + AST_FRIENDLY_OFFSET,
|
|
.desc_size = sizeof(struct g726_desc),
|
|
},
|
|
{
|
|
.name = "g726-32",
|
|
.exts = "g726-32",
|
|
.open = g726_32_open,
|
|
.rewrite = g726_32_rewrite,
|
|
.write = g726_write,
|
|
.seek = g726_seek,
|
|
.trunc = g726_trunc,
|
|
.tell = g726_tell,
|
|
.read = g726_read,
|
|
.buf_size = BUF_SIZE + AST_FRIENDLY_OFFSET,
|
|
.desc_size = sizeof(struct g726_desc),
|
|
},
|
|
{
|
|
.name = "g726-24",
|
|
.exts = "g726-24",
|
|
.open = g726_24_open,
|
|
.rewrite = g726_24_rewrite,
|
|
.write = g726_write,
|
|
.seek = g726_seek,
|
|
.trunc = g726_trunc,
|
|
.tell = g726_tell,
|
|
.read = g726_read,
|
|
.buf_size = BUF_SIZE + AST_FRIENDLY_OFFSET,
|
|
.desc_size = sizeof(struct g726_desc),
|
|
},
|
|
{
|
|
.name = "g726-16",
|
|
.exts = "g726-16",
|
|
.open = g726_16_open,
|
|
.rewrite = g726_16_rewrite,
|
|
.write = g726_write,
|
|
.seek = g726_seek,
|
|
.trunc = g726_trunc,
|
|
.tell = g726_tell,
|
|
.read = g726_read,
|
|
.buf_size = BUF_SIZE + AST_FRIENDLY_OFFSET,
|
|
.desc_size = sizeof(struct g726_desc),
|
|
},
|
|
{ .desc_size = 0 } /* terminator */
|
|
};
|
|
|
|
static int unload_module(void)
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; f_def[i].desc_size ; i++) {
|
|
if (ast_format_def_unregister(f_def[i].name))
|
|
ast_log(LOG_WARNING, "Failed to unregister format %s.\n", f_def[i].name);
|
|
}
|
|
return(0);
|
|
}
|
|
|
|
static int load_module(void)
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; f_def[i].desc_size ; i++) {
|
|
f_def[i].format = ast_format_g726;
|
|
if (ast_format_def_register(&f_def[i])) { /* errors are fatal */
|
|
ast_log(LOG_WARNING, "Failed to register format %s.\n", f_def[i].name);
|
|
unload_module();
|
|
return AST_MODULE_LOAD_DECLINE;
|
|
}
|
|
}
|
|
return AST_MODULE_LOAD_SUCCESS;
|
|
}
|
|
|
|
AST_MODULE_INFO(ASTERISK_GPL_KEY, AST_MODFLAG_LOAD_ORDER, "Raw G.726 (16/24/32/40kbps) data",
|
|
.support_level = AST_MODULE_SUPPORT_CORE,
|
|
.load = load_module,
|
|
.unload = unload_module,
|
|
.load_pri = AST_MODPRI_APP_DEPEND
|
|
);
|