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/*
* Asterisk -- An open source telephony toolkit.
*
* Copyright (C) 2011, Digium, Inc.
*
* David Vossel <dvossel@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 CELT format attribute interface
*
* \author David Vossel <dvossel@digium.com>
*/
/*** MODULEINFO
<support_level>core</support_level>
***/
#include "asterisk.h"
ASTERISK_FILE_VERSION(__FILE__, "$Revision: 413587 $")
#include "asterisk/module.h"
#include "asterisk/format.h"
/*!
* \brief CELT attribute structure.
*
* \note The only attribute that affects compatibility here is the sample rate.
*/
struct celt_attr {
unsigned int samplerate;
unsigned int maxbitrate;
unsigned int framesize;
};
static int celt_sdp_parse(struct ast_format_attr *format_attr, const char *attributes)
{
struct celt_attr *attr = (struct celt_attr *) format_attr;
unsigned int val;
if (sscanf(attributes, "framesize=%30u", &val) == 1) {
attr->framesize = val;
}
return 0;
}
static void celt_sdp_generate(const struct ast_format_attr *format_attr, unsigned int payload, struct ast_str **str)
{
struct celt_attr *attr = (struct celt_attr *) format_attr;
if (!attr->framesize) {
return;
}
ast_str_append(str, 0, "a=fmtp:%u framesize=%u\r\n", payload, attr->framesize);
}
static enum ast_format_cmp_res celt_cmp(const struct ast_format_attr *fattr1, const struct ast_format_attr *fattr2)
{
struct celt_attr *attr1 = (struct celt_attr *) fattr1;
struct celt_attr *attr2 = (struct celt_attr *) fattr2;
if (attr1->samplerate == attr2->samplerate) {
return AST_FORMAT_CMP_EQUAL;
}
return AST_FORMAT_CMP_NOT_EQUAL;
}
static int celt_get_val(const struct ast_format_attr *fattr, int key, void *result)
{
const struct celt_attr *attr = (struct celt_attr *) fattr;
int *val = result;
switch (key) {
case CELT_ATTR_KEY_SAMP_RATE:
*val = attr->samplerate;
break;
case CELT_ATTR_KEY_MAX_BITRATE:
*val = attr->maxbitrate;
break;
case CELT_ATTR_KEY_FRAME_SIZE:
*val = attr->framesize;
break;
default:
ast_log(LOG_WARNING, "unknown attribute type %d\n", key);
return -1;
}
return 0;
}
static int celt_isset(const struct ast_format_attr *fattr, va_list ap)
{
enum celt_attr_keys key;
const struct celt_attr *attr = (struct celt_attr *) fattr;
for (key = va_arg(ap, int);
key != AST_FORMAT_ATTR_END;
key = va_arg(ap, int))
{
switch (key) {
case CELT_ATTR_KEY_SAMP_RATE:
if (attr->samplerate != (va_arg(ap, int))) {
return -1;
}
break;
case CELT_ATTR_KEY_MAX_BITRATE:
if (attr->maxbitrate != (va_arg(ap, int))) {
return -1;
}
break;
case CELT_ATTR_KEY_FRAME_SIZE:
if (attr->framesize != (va_arg(ap, int))) {
return -1;
}
break;
default:
ast_log(LOG_WARNING, "unknown attribute type %u\n", key);
return -1;
}
}
return 0;
}
static int celt_getjoint(const struct ast_format_attr *fattr1, const struct ast_format_attr *fattr2, struct ast_format_attr *result)
{
struct celt_attr *attr1 = (struct celt_attr *) fattr1;
struct celt_attr *attr2 = (struct celt_attr *) fattr2;
struct celt_attr *attr_res = (struct celt_attr *) result;
/* sample rate is the only attribute that has any bearing on if joint capabilities exist or not */
if (attr1->samplerate != attr2->samplerate) {
return -1;
}
/* either would work, they are guaranteed the same at this point. */
attr_res->samplerate = attr1->samplerate;
/* Take the lowest max bitrate */
attr_res->maxbitrate = MIN(attr1->maxbitrate, attr2->maxbitrate);
attr_res->framesize = attr2->framesize; /* TODO figure out what joint framesize means */
return 0;
}
static void celt_set(struct ast_format_attr *fattr, va_list ap)
{
enum celt_attr_keys key;
struct celt_attr *attr = (struct celt_attr *) fattr;
for (key = va_arg(ap, int);
key != AST_FORMAT_ATTR_END;
key = va_arg(ap, int))
{
switch (key) {
case CELT_ATTR_KEY_SAMP_RATE:
attr->samplerate = (va_arg(ap, int));
break;
case CELT_ATTR_KEY_MAX_BITRATE:
attr->maxbitrate = (va_arg(ap, int));
break;
case CELT_ATTR_KEY_FRAME_SIZE:
attr->framesize = (va_arg(ap, int));
break;
default:
ast_log(LOG_WARNING, "unknown attribute type %u\n", key);
}
}
}
static struct ast_format_attr_interface celt_interface = {
.id = AST_FORMAT_CELT,
.format_attr_cmp = celt_cmp,
.format_attr_get_joint = celt_getjoint,
.format_attr_set = celt_set,
.format_attr_isset = celt_isset,
.format_attr_get_val = celt_get_val,
.format_attr_sdp_parse = celt_sdp_parse,
.format_attr_sdp_generate = celt_sdp_generate,
};
static int load_module(void)
{
if (ast_format_attr_reg_interface(&celt_interface)) {
return AST_MODULE_LOAD_DECLINE;
}
return AST_MODULE_LOAD_SUCCESS;
}
static int unload_module(void)
{
ast_format_attr_unreg_interface(&celt_interface);
return 0;
}
AST_MODULE_INFO(ASTERISK_GPL_KEY, AST_MODFLAG_LOAD_ORDER, "CELT Format Attribute Module",
.load = load_module,
.unload = unload_module,
.load_pri = AST_MODPRI_CHANNEL_DEPEND,
);
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