Set SSRC when create RTP receiver.

Author: jianjunz

talk/owt/docker/Dockerfile

@@ -0,0 +1,27 @@
+# Copyright (C) <2021> Intel Corporation
+#
+# SPDX-License-Identifier: Apache-2.0
+
+FROM ubuntu:20.04
+SHELL ["/bin/bash", "-c"]
+RUN apt-get update && apt-get install -y git curl wget python python3
+RUN mkdir workspace
+WORKDIR /workspace
+RUN git clone https://chromium.googlesource.com/chromium/tools/depot_tools.git
+ENV PATH="$PATH:/workspace/depot_tools"
+RUN mkdir owt
+WORKDIR /workspace/owt
+RUN echo $'solutions = [\n\
+  {\n\
+    "name"        : "src",\n\
+    "url"         : "https://github.com/open-webrtc-toolkit/owt-client-native.git",\n\
+    "deps_file"   : "DEPS",\n\
+    "managed"     : False,\n\
+    "custom_deps" : {\n\
+    },\n\
+    "custom_vars": {},\n\
+  },\n\
+]' > .gclient
+RUN git config --global user.name owt-bot
+RUN git config --global user.email [email protected]
+RUN gclient sync

talk/owt/gn/toolchain/.emscripten

@@ -0,0 +1,39 @@
+# Copyright (C) 2021 The Android Open Source Project
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+# This is the init script that is passed to `emcc --em-config=.emscripten`
+# (Wasm toolchain). It sets vars to locate the various emsdk / llvm dirs.
+
+import os
+import sys
+from platform import system
+
+# We cannot use __file__ here.
+this_file = os.getenv('EM_CONFIG')
+if this_file is None:
+  sys.stderr.write('Could not find EM_CONFIG in .emscripten\n')
+  sys.exit(1)
+
+root_dir = os.path.dirname(os.path.dirname(os.path.dirname(this_file)))
+buildools_os = 'mac' if system().lower() == 'darwin' else 'linux64'
+node_path = os.path.join(root_dir, 'buildtools', buildools_os, 'nodejs')
+emsdk_path = os.path.join(root_dir, 'buildtools', buildools_os, 'emsdk')
+
+# Exported vars.
+NODE_JS = os.path.join(node_path, 'bin', 'node')
+LLVM_ROOT = os.path.join(emsdk_path, 'bin')
+BINARYEN_ROOT = emsdk_path
+EMSCRIPTEN_ROOT = os.path.join(emsdk_path, 'emscripten')
+COMPILER_ENGINE = NODE_JS
+JS_ENGINES = [NODE_JS]

talk/owt/sdk/wasm/media_session.cc

@@ -32,8 +32,10 @@ MediaSession::MediaSession()
   call_ = std::unique_ptr<webrtc::Call>(webrtc::Call::Create(config));
 }
 
-std::shared_ptr<RtpVideoReceiver> MediaSession::CreateRtpVideoReceiver() {
+std::shared_ptr<RtpVideoReceiver> MediaSession::CreateRtpVideoReceiver(
+    uint32_t remote_ssrc) {
   webrtc::VideoReceiveStream::Config config(this);
+  config.rtp.remote_ssrc = remote_ssrc;
   config.rtp.local_ssrc = 1;
   // Same as `kNackRtpHistoryMs` in third_party/webrtc/media/engine/webrtc_voice_engine.cc.
   config.rtp.nack.rtp_history_ms = 5000;

talk/owt/sdk/wasm/media_session.h

@@ -18,7 +18,8 @@ class MediaSession : public webrtc::Transport {
  public:
   explicit MediaSession();
   virtual ~MediaSession() = default;
-  std::shared_ptr<RtpVideoReceiver> CreateRtpVideoReceiver();
+  std::shared_ptr<RtpVideoReceiver> CreateRtpVideoReceiver(
+      uint32_t remote_ssrc);
   void SetRtcpCallback(emscripten::val callback);
 
   // Overrides webrtc::Transport.