Switch stream creation and closing in Chrome audio rendering from IPC to Mojo

content/browser/media/audio_output_impl.cc

+// Copyright 2016 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/browser/media/audio_output_impl.h"
+#include "media/mojo/common/media_type_converters.h"
+
+namespace content {
+
+AudioOutputStreamImpl::AudioOutputStreamImpl(
+    media::interfaces::AudioOutputStreamRequest request,
+    int stream_id,
+    AudioRendererHost* audio_renderer_host)
+    : binding_(this, std::move(request)),
+      stream_id_(stream_id),
+      audio_renderer_host_(audio_renderer_host) {
+  DCHECK_CURRENTLY_ON(BrowserThread::IO);
+}
+
+AudioOutputStreamImpl::~AudioOutputStreamImpl() {
+  DCHECK_CURRENTLY_ON(BrowserThread::IO);
+}
+
+void AudioOutputStreamImpl::Close() {
+  DCHECK_CURRENTLY_ON(BrowserThread::IO);
+
+  audio_renderer_host_->OnCloseStream(stream_id_);
+}
+
+AudioOutputImpl::AudioOutputImpl(
+    scoped_refptr<AudioRendererHost> audio_renderer_host,
+    media::interfaces::AudioOutputRequest request)
+    : audio_renderer_host_(audio_renderer_host.get()), binding_(this) {
+  DCHECK_CURRENTLY_ON(BrowserThread::IO);
+
+  binding_.Bind(std::move(request));
+}
+
+AudioOutputImpl::~AudioOutputImpl() {}
+
+// static
+void AudioOutputImpl::CreateService(
+    scoped_refptr<AudioRendererHost> audio_renderer_host,
+    media::interfaces::AudioOutputRequest request) {
+  DCHECK_CURRENTLY_ON(BrowserThread::UI);
+
+  BrowserThread::PostTask(
+      BrowserThread::IO, FROM_HERE,
+      base::Bind(&AudioOutputImpl::CreateServiceOnIOThread, audio_renderer_host,
+                 base::Passed(&request)));
+}
+
+// static
+void AudioOutputImpl::CreateServiceOnIOThread(
+    scoped_refptr<AudioRendererHost> audio_renderer_host,
+    media::interfaces::AudioOutputRequest request) {
+  DCHECK_CURRENTLY_ON(BrowserThread::IO);
+
+  auto service = new AudioOutputImpl(audio_renderer_host, std::move(request));
+  audio_renderer_host->audio_output_impl_ = service;

[mcasas, 2016/04/29 18:29:00]

Don't make AudioOutput*Impl friend of AudioRendererHost
to allow these plugging operations. Make methods at 
the very least.

[rchtara, 2016/05/23 16:38:17]

Done.

+}
+
+void AudioOutputImpl::CreateStream(
+    int stream_id,
+    int render_frame_id,
+    media::interfaces::AudioOutputStreamParametersPtr params,
+    const CreateStreamCallback& callback) {
+  DCHECK_CURRENTLY_ON(BrowserThread::IO);
+
+  media::interfaces::AudioOutputStreamPtr stream;
+  media::AudioParameters audio_params =
+      mojo::ConvertTo<media::AudioParameters>(params);
+
+  audio_renderer_host_->CreateStream(stream_id, render_frame_id, audio_params,
+                                     callback);
+}
+
+media::interfaces::AudioOutputStreamPtr AudioOutputImpl::StreamFactory(
+    int stream_id,
+    AudioRendererHost* audio_renderer_host) {
+  DCHECK_CURRENTLY_ON(BrowserThread::IO);
+
+  media::interfaces::AudioOutputStreamPtr stream =
+      media::interfaces::AudioOutputStreamPtr();
+  std::unique_ptr<AudioOutputStreamImpl> stream_ptr(new AudioOutputStreamImpl(
+      mojo::GetProxy(&stream), stream_id, audio_renderer_host));
+
+  auto ret = stream_impls_.insert(
+      std::pair<int, std::unique_ptr<AudioOutputStreamImpl>>(

[mcasas, 2016/04/29 18:29:00]

std::make_pair(stream_id, std::move(stream_ptr));

[rchtara, 2016/05/23 16:38:17]

Done.

+          stream_id, std::move(stream_ptr)));
+  DCHECK(ret.second);
+  return stream;
+}
+
+}  // namespace content