asterisk/formats/format_siren7.c

160 lines
4.3 KiB
C

/*
* 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 ITU G.722.1 (Siren7, licensed from Polycom) format, 32kbps bitrate only
* \arg File name extensions: siren7
* \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 BUF_SIZE 80 /* 20 milliseconds == 80 bytes, 320 samples */
#define SAMPLES_TO_BYTES(x) x / (320 / 80)
#define BYTES_TO_SAMPLES(x) x * (320 / 80)
static struct ast_frame *siren7read(struct ast_filestream *s, int *whennext)
{
size_t res;
/* Send a frame from the file to the appropriate channel */
AST_FRAME_SET_BUFFER(&s->fr, s->buf, AST_FRIENDLY_OFFSET, BUF_SIZE);
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 = BYTES_TO_SAMPLES(res);
return &s->fr;
}
static int siren7write(struct ast_filestream *fs, struct ast_frame *f)
{
int res;
if ((res = fwrite(f->data.ptr, 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 siren7seek(struct ast_filestream *fs, off_t sample_offset, int whence)
{
off_t offset = 0, min = 0, cur, max;
sample_offset = SAMPLES_TO_BYTES(sample_offset);
if ((cur = ftello(fs->f)) < 0) {
ast_log(AST_LOG_WARNING, "Unable to determine current position in siren7 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 siren7 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 siren7 filestream %p: %s\n", fs, strerror(errno));
return -1;
}
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 siren7trunc(struct ast_filestream *fs)
{
int fd;
off_t cur;
if ((fd = fileno(fs->f)) < 0) {
ast_log(AST_LOG_WARNING, "Unable to determine file descriptor for siren7 filestream %p: %s\n", fs, strerror(errno));
return -1;
}
if ((cur = ftello(fs->f)) < 0) {
ast_log(AST_LOG_WARNING, "Unable to determine current position in siren7 filestream %p: %s\n", fs, strerror(errno));
return -1;
}
/* Truncate file to current length */
return ftruncate(fd, cur);
}
static off_t siren7tell(struct ast_filestream *fs)
{
return BYTES_TO_SAMPLES(ftello(fs->f));
}
static struct ast_format_def siren7_f = {
.name = "siren7",
.exts = "siren7",
.write = siren7write,
.seek = siren7seek,
.trunc = siren7trunc,
.tell = siren7tell,
.read = siren7read,
.buf_size = BUF_SIZE + AST_FRIENDLY_OFFSET,
};
static int load_module(void)
{
siren7_f.format = ast_format_siren7;
if (ast_format_def_register(&siren7_f))
return AST_MODULE_LOAD_DECLINE;
return AST_MODULE_LOAD_SUCCESS;
}
static int unload_module(void)
{
return ast_format_def_unregister(siren7_f.name);
}
AST_MODULE_INFO(ASTERISK_GPL_KEY, AST_MODFLAG_LOAD_ORDER, "ITU G.722.1 (Siren7, licensed from Polycom)",
.support_level = AST_MODULE_SUPPORT_CORE,
.load = load_module,
.unload = unload_module,
.load_pri = AST_MODPRI_APP_DEPEND
);