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262473c6d9
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
104 lines
2.8 KiB
C
104 lines
2.8 KiB
C
/*
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* Asterisk -- An open source telephony toolkit.
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*
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* Copyright (C) 2016, Digium, Inc.
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*
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* Joshua Colp <jcolp@digium.com>
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*
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* See http://www.asterisk.org for more information about
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* the Asterisk project. Please do not directly contact
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* any of the maintainers of this project for assistance;
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* the project provides a web site, mailing lists and IRC
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* channels for your use.
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*
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* This program is free software, distributed under the terms of
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* the GNU General Public License Version 2. See the LICENSE file
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* at the top of the source tree.
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*/
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/*!
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* \file
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* \brief Siren7 format attribute interface
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*
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* \author Joshua Colp <jcolp@digium.com>
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*/
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/*** MODULEINFO
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<support_level>core</support_level>
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***/
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#include "asterisk.h"
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#include <ctype.h> /* for tolower */
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#include "asterisk/module.h"
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#include "asterisk/format.h"
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#include "asterisk/astobj2.h" /* for ao2_bump */
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#include "asterisk/logger.h" /* for ast_log, LOG_WARNING */
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#include "asterisk/strings.h" /* for ast_str_append */
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/* Destroy is a required callback and must exist */
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static void siren7_destroy(struct ast_format *format)
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{
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}
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/* Clone is a required callback and must exist */
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static int siren7_clone(const struct ast_format *src, struct ast_format *dst)
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{
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return 0;
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}
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static struct ast_format *siren7_parse_sdp_fmtp(const struct ast_format *format, const char *attributes)
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{
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char *attribs = ast_strdupa(attributes), *attrib;
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unsigned int val;
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/* lower-case everything, so we are case-insensitive */
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for (attrib = attribs; *attrib; ++attrib) {
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*attrib = tolower(*attrib);
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} /* based on channels/chan_sip.c:process_a_sdp_image() */
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if (sscanf(attribs, "bitrate=%30u", &val) == 1) {
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if (val != 32000) {
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ast_log(LOG_WARNING, "Got Siren7 offer at %u bps, but only 32000 bps supported; ignoring.\n", val);
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return NULL;
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}
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}
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/* We aren't modifying the format and once passed back it won't be touched, so use what we were given */
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return ao2_bump((struct ast_format *)format);
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}
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static void siren7_generate_sdp_fmtp(const struct ast_format *format, unsigned int payload, struct ast_str **str)
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{
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ast_str_append(str, 0, "a=fmtp:%u bitrate=32000\r\n", payload);
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}
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static struct ast_format_interface siren7_interface = {
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.format_destroy = siren7_destroy,
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.format_clone = siren7_clone,
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.format_parse_sdp_fmtp = siren7_parse_sdp_fmtp,
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.format_generate_sdp_fmtp = siren7_generate_sdp_fmtp,
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};
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static int load_module(void)
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{
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if (ast_format_interface_register("siren7", &siren7_interface)) {
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return AST_MODULE_LOAD_DECLINE;
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}
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return AST_MODULE_LOAD_SUCCESS;
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}
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static int unload_module(void)
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{
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return 0;
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}
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AST_MODULE_INFO(ASTERISK_GPL_KEY, AST_MODFLAG_LOAD_ORDER, "Siren7 Format Attribute Module",
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.support_level = AST_MODULE_SUPPORT_CORE,
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.load = load_module,
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.unload = unload_module,
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.load_pri = AST_MODPRI_CHANNEL_DEPEND,
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);
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