see RFC 4855: parameter names are case-insensitive both in media type strings and in the default mapping to the SDP a=fmtp attribute. This change is required for H.263+ because some implementations are known to use even mixed-case. This does not fix ASTERISK~29268 because H.264 was not fixed. This approach here lowers/uppers both parameter names and parameter values. H.264 needs a different approach because one of its parameter values is not case-insensitive: sprop-parameter-sets is Base64. Change-Id: Idf2a73457be231647aed3c87b1da197afba86892
217 lines
5.5 KiB
C
217 lines
5.5 KiB
C
/*
|
|
* 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 <ctype.h> /* for tolower */
|
|
|
|
#include "asterisk/module.h"
|
|
#include "asterisk/format.h"
|
|
#include "asterisk/astobj2.h" /* for ao2_ref */
|
|
#include "asterisk/logger.h" /* for ast_log, LOG_WARNING */
|
|
#include "asterisk/strings.h" /* for ast_str_append */
|
|
#include "asterisk/utils.h" /* for MIN */
|
|
|
|
/*!
|
|
* \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)
|
|
{
|
|
char *attribs = ast_strdupa(attributes), *attrib;
|
|
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);
|
|
|
|
/* lower-case everything, so we are case-insensitive */
|
|
for (attrib = attribs; *attrib; ++attrib) {
|
|
*attrib = tolower(*attrib);
|
|
} /* based on channels/chan_sip.c:process_a_sdp_image() */
|
|
|
|
if (sscanf(attribs, "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,
|
|
);
|