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https://gitlab.gnome.org/GNOME/calls.git
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7d113d4180
static capabilities are now supporting multiple codecs and generate correct SDP messages. This only relates to SDP offers. When we are answering an offer we must take the offer from the other party into account when creating the answer. Hence why we differentiate between "static" and "dynamic" (not implemented yet) capability strings.
149 lines
4.1 KiB
C
149 lines
4.1 KiB
C
/*
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* Copyright (C) 2021 Purism SPC
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*
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* This file is part of Calls.
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*
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* Calls is free software: you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* Calls is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with Calls. If not, see <http://www.gnu.org/licenses/>.
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*
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* Author: Evangelos Ribeiro Tzaras <evangelos.tzaras@puri.sm>
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*
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* SPDX-License-Identifier: GPL-3.0-or-later
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*
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*/
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#define G_LOG_DOMAIN "CallsCallsSipMediaManager"
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#include "calls-sip-media-pipeline.h"
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#include "gst-rfc3551.h"
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#include "calls-sip-media-manager.h"
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#include <gst/gst.h>
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typedef struct _CallsSipMediaManager
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{
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GObject parent;
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GList *supported_codecs;
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} CallsSipMediaManager;
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G_DEFINE_TYPE (CallsSipMediaManager, calls_sip_media_manager, G_TYPE_OBJECT);
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static void
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calls_sip_media_manager_finalize (GObject *object)
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{
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gst_deinit ();
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g_list_free (CALLS_SIP_MEDIA_MANAGER (object)->supported_codecs);
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G_OBJECT_CLASS (calls_sip_media_manager_parent_class)->finalize (object);
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}
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static void
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calls_sip_media_manager_class_init (CallsSipMediaManagerClass *klass)
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{
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GObjectClass *object_class = G_OBJECT_CLASS (klass);
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object_class->finalize = calls_sip_media_manager_finalize;
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}
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static void
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calls_sip_media_manager_init (CallsSipMediaManager *self)
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{
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gst_init (NULL, NULL);
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self->supported_codecs = media_codecs_get_candidates ();
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}
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/* Public functions */
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CallsSipMediaManager *
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calls_sip_media_manager_default ()
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{
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static CallsSipMediaManager *instance = NULL;
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if (instance == NULL) {
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g_debug ("Creating CallsSipMediaManager");
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instance = g_object_new (CALLS_TYPE_SIP_MEDIA_MANAGER, NULL);
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g_object_add_weak_pointer (G_OBJECT (instance), (gpointer *) &instance);
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}
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return instance;
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}
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/* calls_sip_media_manager_static_capabilities:
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*
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* @port: Should eventually come from the ICE stack
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* @use_srtp: Whether to use srtp (not really handled)
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*
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* Returns: (full-control) string describing capabilities
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* to be used in the session description (SDP)
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*/
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char *
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calls_sip_media_manager_static_capabilities (CallsSipMediaManager *self,
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guint port,
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gboolean use_srtp)
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{
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char *payload_type = use_srtp ? "SAVP" : "AVP";
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g_autoptr (GString) media_line = NULL;
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g_autoptr (GString) attribute_lines = NULL;
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GList *node;
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g_return_val_if_fail (CALLS_IS_SIP_MEDIA_MANAGER (self), NULL);
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media_line = g_string_new (NULL);
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attribute_lines = g_string_new (NULL);
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if (self->supported_codecs == NULL) {
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g_warning ("No supported codecs found. Can't build meaningful SDP message");
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g_string_append_printf (media_line, "m=audio 0 RTP/AVP 0");
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goto done;
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}
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/* media lines look f.e like "audio 31337 RTP/AVP 9 8 0" */
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g_string_append_printf (media_line,
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"m=audio %d RTP/%s", port, payload_type);
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for (node = self->supported_codecs; node != NULL; node = node->next) {
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MediaCodecInfo *codec = node->data;
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g_string_append_printf (media_line, " %s", codec->payload_id);
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g_string_append_printf (attribute_lines,
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"a=rtpmap:%s %s/%s%s",
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codec->payload_id,
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codec->name,
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codec->clock_rate,
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"\r\n");
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}
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g_string_append_printf (attribute_lines, "a=rtcp:%d\r\n", port + 1);
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done:
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return g_strdup_printf ("v=0\r\n"
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"%s\r\n"
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"%s\r\n",
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media_line->str,
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attribute_lines->str);
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}
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MediaCodecInfo*
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get_best_codec (CallsSipMediaManager *self)
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{
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return media_codec_by_name ("PCMA");
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}
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