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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"
#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 void celt_destroy(struct ast_format *format)
{
struct celt_attr *attr = ast_format_get_attribute_data(format);
ast_free(attr);
}
static int celt_clone(const struct ast_format *src, struct ast_format *dst)
{
struct celt_attr *original = ast_format_get_attribute_data(src);
struct celt_attr *attr = ast_calloc(1, sizeof(*attr));
if (!attr) {
return -1;
}
if (original) {
*attr = *original;
}
ast_format_set_attribute_data(dst, attr);
return 0;
}
static struct ast_format *celt_parse_sdp_fmtp(const struct ast_format *format, const char *attributes)
{
struct ast_format *cloned;
struct celt_attr *attr;
unsigned int val;
cloned = ast_format_clone(format);
if (!cloned) {
return NULL;
}
attr = ast_format_get_attribute_data(cloned);
if (sscanf(attributes, "framesize=%30u", &val) == 1) {
attr->framesize = val;
}
return cloned;
}
static void celt_generate_sdp_fmtp(const struct ast_format *format, unsigned int payload, struct ast_str **str)
{
struct celt_attr *attr = ast_format_get_attribute_data(format);
if (!attr || !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 *format1, const struct ast_format *format2)
{
struct celt_attr *attr1 = ast_format_get_attribute_data(format1);
struct celt_attr *attr2 = ast_format_get_attribute_data(format2);
if (((!attr1 || !attr1->samplerate) && (!attr2 || !attr2->samplerate)) ||
(attr1->samplerate == attr2->samplerate)) {
return AST_FORMAT_CMP_EQUAL;
}
return AST_FORMAT_CMP_NOT_EQUAL;
}
static struct ast_format *celt_getjoint(const struct ast_format *format1, const struct ast_format *format2)
{
struct celt_attr *attr1 = ast_format_get_attribute_data(format1);
struct celt_attr *attr2 = ast_format_get_attribute_data(format2);
struct ast_format *jointformat;
struct celt_attr *jointattr;
if (attr1 && attr2 && (attr1->samplerate != attr2->samplerate)) {
return NULL;
}
jointformat = ast_format_clone(format1);
if (!jointformat) {
return NULL;
}
jointattr = ast_format_get_attribute_data(jointformat);
/* either would work, they are guaranteed the same at this point. */
jointattr->samplerate = attr1->samplerate;
/* Take the lowest max bitrate */
jointattr->maxbitrate = MIN(attr1->maxbitrate, attr2->maxbitrate);
jointattr->framesize = attr2->framesize; /* TODO figure out what joint framesize means */
return jointformat;
}
static struct ast_format *celt_set(const struct ast_format *format, const char *name, const char *value)
{
struct ast_format *cloned;
struct celt_attr *attr;
unsigned int val;
cloned = ast_format_clone(format);
if (!cloned) {
return NULL;
}
attr = ast_format_get_attribute_data(cloned);
if (sscanf(value, "%30u", &val) != 1) {
ast_log(LOG_WARNING, "Unknown value '%s' for attribute type '%s'\n",
value, name);
ao2_ref(cloned, -1);
return NULL;
}
if (!strcasecmp(name, "sample_rate")) {
attr->samplerate = val;
} else if (!strcasecmp(name, "max_bitrate")) {
attr->maxbitrate = val;
} else if (!strcasecmp(name, "frame_size")) {
attr->framesize = val;
} else {
ast_log(LOG_WARNING, "Unknown attribute type '%s'\n", name);
ao2_ref(cloned, -1);
return NULL;
}
return cloned;
}
static struct ast_format_interface celt_interface = {
.format_destroy = celt_destroy,
.format_clone = celt_clone,
.format_cmp = celt_cmp,
.format_get_joint = celt_getjoint,
.format_attribute_set = celt_set,
.format_parse_sdp_fmtp = celt_parse_sdp_fmtp,
.format_generate_sdp_fmtp = celt_generate_sdp_fmtp,
};
static int load_module(void)
{
if (ast_format_interface_register("celt", &celt_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, "CELT 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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