mirror of https://github.com/asterisk/asterisk
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
142 lines
3.5 KiB
142 lines
3.5 KiB
/*
|
|
* Asterisk -- An open source telephony toolkit.
|
|
*
|
|
* Copyright (C) 1999 - 2008, Anthony Minessale and Digium, Inc.
|
|
* Anthony Minessale (anthmct@yahoo.com)
|
|
* Kevin P. Fleming <kpfleming@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 RAW SLINEAR 16 Format
|
|
* \arg File name extensions: sln16
|
|
* \ingroup formats
|
|
*/
|
|
|
|
#include "asterisk.h"
|
|
|
|
ASTERISK_FILE_VERSION(__FILE__, "$Revision$")
|
|
|
|
#include "asterisk/mod_format.h"
|
|
#include "asterisk/module.h"
|
|
#include "asterisk/endian.h"
|
|
|
|
#define BUF_SIZE 640 /* 640 bytes, 320 samples */
|
|
#define SLIN_SAMPLES 320
|
|
|
|
static struct ast_frame *slinear_read(struct ast_filestream *s, int *whennext)
|
|
{
|
|
int res;
|
|
/* Send a frame from the file to the appropriate channel */
|
|
|
|
s->fr.frametype = AST_FRAME_VOICE;
|
|
s->fr.subclass = AST_FORMAT_SLINEAR16;
|
|
s->fr.mallocd = 0;
|
|
AST_FRAME_SET_BUFFER(&s->fr, s->buf, AST_FRIENDLY_OFFSET, BUF_SIZE);
|
|
if ((res = fread(s->fr.data, 1, s->fr.datalen, s->f)) < 1) {
|
|
if (res)
|
|
ast_log(LOG_WARNING, "Short read (%d) (%s)!\n", res, strerror(errno));
|
|
return NULL;
|
|
}
|
|
*whennext = s->fr.samples = res/2;
|
|
s->fr.datalen = res;
|
|
return &s->fr;
|
|
}
|
|
|
|
static int slinear_write(struct ast_filestream *fs, struct ast_frame *f)
|
|
{
|
|
int res;
|
|
|
|
if (f->frametype != AST_FRAME_VOICE) {
|
|
ast_log(LOG_WARNING, "Asked to write non-voice frame!\n");
|
|
return -1;
|
|
}
|
|
if (f->subclass != AST_FORMAT_SLINEAR16) {
|
|
ast_log(LOG_WARNING, "Asked to write non-slinear16 frame (%d)!\n", f->subclass);
|
|
return -1;
|
|
}
|
|
if ((res = fwrite(f->data, 1, f->datalen, fs->f)) != f->datalen) {
|
|
ast_log(LOG_WARNING, "Bad write (%d/%d): %s\n", res, f->datalen, strerror(errno));
|
|
return -1;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int slinear_seek(struct ast_filestream *fs, off_t sample_offset, int whence)
|
|
{
|
|
off_t offset = 0, min = 0, cur, max;
|
|
|
|
sample_offset <<= 1;
|
|
|
|
cur = ftello(fs->f);
|
|
|
|
fseeko(fs->f, 0, SEEK_END);
|
|
|
|
max = ftello(fs->f);
|
|
|
|
if (whence == SEEK_SET)
|
|
offset = sample_offset;
|
|
else if (whence == SEEK_CUR || whence == SEEK_FORCECUR)
|
|
offset = sample_offset + cur;
|
|
else if (whence == SEEK_END)
|
|
offset = max - sample_offset;
|
|
|
|
if (whence != SEEK_FORCECUR)
|
|
offset = (offset > max) ? max : offset;
|
|
|
|
/* always protect against seeking past begining. */
|
|
offset = (offset < min) ? min : offset;
|
|
|
|
return fseeko(fs->f, offset, SEEK_SET);
|
|
}
|
|
|
|
static int slinear_trunc(struct ast_filestream *fs)
|
|
{
|
|
return ftruncate(fileno(fs->f), ftello(fs->f));
|
|
}
|
|
|
|
static off_t slinear_tell(struct ast_filestream *fs)
|
|
{
|
|
return ftello(fs->f) / 2;
|
|
}
|
|
|
|
static const struct ast_format slin_f = {
|
|
.name = "sln16",
|
|
.exts = "sln16",
|
|
.format = AST_FORMAT_SLINEAR16,
|
|
.write = slinear_write,
|
|
.seek = slinear_seek,
|
|
.trunc = slinear_trunc,
|
|
.tell = slinear_tell,
|
|
.read = slinear_read,
|
|
.buf_size = BUF_SIZE + AST_FRIENDLY_OFFSET,
|
|
};
|
|
|
|
static int load_module(void)
|
|
{
|
|
if (ast_format_register(&slin_f))
|
|
return AST_MODULE_LOAD_FAILURE;
|
|
|
|
return AST_MODULE_LOAD_SUCCESS;
|
|
}
|
|
|
|
static int unload_module(void)
|
|
{
|
|
return ast_format_unregister(slin_f.name);
|
|
}
|
|
|
|
AST_MODULE_INFO(ASTERISK_GPL_KEY, AST_MODFLAG_LOAD_FIRST, "Raw Signed Linear 16KHz Audio support (SLN16)",
|
|
.load = load_module,
|
|
.unload = unload_module,
|
|
);
|