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/*
* Asterisk -- An open source telephony toolkit.
*
* Copyright (C) 2016, Alexander Traud
*
* Alexander Traud <pabstraud@compuserve.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 iLBC format attribute interface
*
* \author Alexander Traud <pabstraud@compuserve.com>
*
* \note http://tools.ietf.org/html/rfc3952
*/
/*** MODULEINFO
<support_level>core</support_level>
***/
#include "asterisk.h"
#include "asterisk/module.h"
#include "asterisk/format.h"
#include "asterisk/strings.h" /* for ast_str_append */
#include "asterisk/utils.h" /* for ast_calloc, ast_free */
#include "asterisk/ilbc.h"
static struct ilbc_attr default_ilbc_attr = {
.mode = 20,
};
static void ilbc_destroy(struct ast_format *format)
{
struct ilbc_attr *attr = ast_format_get_attribute_data(format);
ast_free(attr);
}
static int ilbc_clone(const struct ast_format *src, struct ast_format *dst)
{
struct ilbc_attr *original = ast_format_get_attribute_data(src);
struct ilbc_attr *attr = ast_malloc(sizeof(*attr));
if (!attr) {
return -1;
}
if (original) {
*attr = *original;
} else {
*attr = default_ilbc_attr;
}
ast_format_set_attribute_data(dst, attr);
return 0;
}
static struct ast_format *ilbc_parse_sdp_fmtp(const struct ast_format *format, const char *attributes)
{
struct ast_format *cloned;
struct ilbc_attr *attr;
const char *kvp;
unsigned int val;
cloned = ast_format_clone(format);
if (!cloned) {
return NULL;
}
attr = ast_format_get_attribute_data(cloned);
if ((kvp = strstr(attributes, "mode")) && sscanf(kvp, "mode=%30u", &val) == 1) {
attr->mode = val;
} else {
attr->mode = 30; /* optional attribute; 30 is default value */
}
return cloned;
}
static void ilbc_generate_sdp_fmtp(const struct ast_format *format, unsigned int payload, struct ast_str **str)
{
struct ilbc_attr *attr = ast_format_get_attribute_data(format);
if (!attr) {
attr = &default_ilbc_attr;
}
/* When the VoIP/SIP client Zoiper calls Asterisk and its
* iLBC 20 is disabled but iLBC 30 enabled, Zoiper still
* falls back to iLBC 20, when there is no mode=30 in the
* answer. Consequently, Zoiper defaults to iLBC 20. To
* make that client happy, Asterisk sends mode always.
* tested in June 2016, Zoiper Premium 1.13.2 for iPhone
*/
/* if (attr->mode != 30) */ {
ast_str_append(str, 0, "a=fmtp:%u mode=%u\r\n", payload, attr->mode);
}
}
static struct ast_format *ilbc_getjoint(const struct ast_format *format1, const struct ast_format *format2)
{
struct ast_format *jointformat;
struct ilbc_attr *attr1 = ast_format_get_attribute_data(format1);
struct ilbc_attr *attr2 = ast_format_get_attribute_data(format2);
struct ilbc_attr *attr_res;
if (!attr1) {
attr1 = &default_ilbc_attr;
}
if (!attr2) {
attr2 = &default_ilbc_attr;
}
jointformat = ast_format_clone(format1);
if (!jointformat) {
return NULL;
}
attr_res = ast_format_get_attribute_data(jointformat);
if (attr1->mode != attr2->mode) {
attr_res->mode = 30;
}
return jointformat;
}
static struct ast_format_interface ilbc_interface = {
.format_destroy = ilbc_destroy,
.format_clone = ilbc_clone,
.format_cmp = NULL,
.format_get_joint = ilbc_getjoint,
.format_attribute_set = NULL,
.format_parse_sdp_fmtp = ilbc_parse_sdp_fmtp,
.format_generate_sdp_fmtp = ilbc_generate_sdp_fmtp,
};
static int load_module(void)
{
if (ast_format_interface_register("ilbc", &ilbc_interface)) {
return AST_MODULE_LOAD_DECLINE;
}
return AST_MODULE_LOAD_SUCCESS;
}
static int unload_module(void)
{
return 0;
}
AST_MODULE_INFO(ASTERISK_GPL_KEY, AST_MODFLAG_LOAD_ORDER,
"iLBC Format Attribute Module",
.support_level = AST_MODULE_SUPPORT_CORE,
.load = load_module,
.unload = unload_module,
.load_pri = AST_MODPRI_CHANNEL_DEPEND,
);
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