Associate audio streams with their source/destination RenderView.

content/renderer/media/renderer_audio_output_device.cc

+// Copyright (c) 2012 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "content/renderer/media/renderer_audio_output_device.h"
+
+#include "base/bind.h"
+#include "base/message_loop_proxy.h"
+#include "content/renderer/media/audio_message_filter.h"
+
+namespace content {
+
+RendererAudioOutputDevice::RendererAudioOutputDevice(
+    AudioMessageFilter* message_filter,
+    const scoped_refptr<base::MessageLoopProxy>& io_loop)
+    : AudioOutputDevice(message_filter, io_loop),
+      source_render_view_id_(MSG_ROUTING_NONE),
+      is_after_stream_created_(false) {
+}
+
+RendererAudioOutputDevice::~RendererAudioOutputDevice() {}
+
+void RendererAudioOutputDevice::Start() {
+  AudioOutputDevice::Start();
+  message_loop()->PostTask(
+      FROM_HERE,
+      base::Bind(&RendererAudioOutputDevice::OnStart, this));
+}
+
+void RendererAudioOutputDevice::Stop() {
+  AudioOutputDevice::Stop();
+  message_loop()->PostTask(
+      FROM_HERE,
+      base::Bind(&RendererAudioOutputDevice::OnStop, this));
+}
+
+void RendererAudioOutputDevice::SetSourceRenderView(int render_view_id) {
+  message_loop()->PostTask(
+      FROM_HERE,
+      base::Bind(&RendererAudioOutputDevice::OnSourceChange, this,
+                 render_view_id));
+}
+
+void RendererAudioOutputDevice::OnStart() {
+  is_after_stream_created_ = true;
+  OnSourceChange(source_render_view_id_);
+}
+
+void RendererAudioOutputDevice::OnStop() {
+  is_after_stream_created_ = false;
+}
+
+void RendererAudioOutputDevice::OnSourceChange(int render_view_id) {
+  source_render_view_id_ = render_view_id;
+  if (is_after_stream_created_ && source_render_view_id_ != MSG_ROUTING_NONE) {
+    AudioMessageFilter* const filter =
+        static_cast<AudioMessageFilter*>(audio_output_ipc());
+    if (filter)
+      filter->AssociateStreamWithProducer(stream_id(), source_render_view_id_);
+  }
+}
+
+}  // namespace content