Add mojo interface for audio rendering.

content/browser/renderer_host/media/audio_output_service_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/renderer_host/media/audio_output_service_impl.h"
+
+#include <utility>
+
+#include "base/metrics/histogram_macros.h"
+#include "base/single_thread_task_runner.h"
+#include "content/browser/bad_message.h"
+#include "content/browser/media/capture/audio_mirroring_manager.h"
+#include "content/browser/renderer_host/media/audio_output_impl.h"
+#include "content/browser/renderer_host/media/audio_output_service_context.h"
+#include "content/browser/renderer_host/media/media_stream_manager.h"
+#include "content/public/browser/browser_thread.h"
+#include "media/audio/audio_manager.h"
+#include "media/base/audio_parameters.h"
+#include "media/mojo/interfaces/audio_output.mojom.h"
+#include "mojo/public/cpp/bindings/binding.h"
+
+namespace content {
+
+namespace {
+
+void UMALogDeviceAuthorizationTime(base::TimeTicks auth_start_time) {
+  UMA_HISTOGRAM_CUSTOM_TIMES("Media.Audio.OutputDeviceAuthorizationTime",
+                             base::TimeTicks::Now() - auth_start_time,
+                             base::TimeDelta::FromMilliseconds(1),
+                             base::TimeDelta::FromMilliseconds(5000), 50);
+}
+
+}  // namespace
+
+// TODO GetOutputControllers :(
+
+AudioOutputServiceImpl::AudioOutputServiceImpl(
+    AudioOutputServiceContext* context,
+    int render_frame_id,
+    base::Callback<void(AudioOutputServiceImpl*)> finished_callback,
+    media::mojom::AudioOutputServiceRequest request)
+    : context_(context),
+      binding_(this, std::move(request)),
+      audio_outputs_(),
+      render_frame_id_(render_frame_id) {
+  DCHECK_CURRENTLY_ON(BrowserThread::IO);
+  binding_.set_connection_error_handler(
+      base::Bind(std::move(finished_callback), base::Unretained(this)));
+}
+
+AudioOutputServiceImpl::~AudioOutputServiceImpl() {
+  DCHECK_CURRENTLY_ON(BrowserThread::IO);
+}
+
+void AudioOutputServiceImpl::RequestDeviceAuthorization(
+    int64_t session_id,
+    const std::string& device_id,
+    media::mojom::AudioOutputRequest audio_output_request,
+    const url::Origin& origin,
+    const RequestDeviceAuthorizationCallback& callback) {
+  DCHECK_CURRENTLY_ON(BrowserThread::IO);
+  const base::TimeTicks auth_start_time = base::TimeTicks::Now();
+
+  if (!base::IsValueInRangeForNumericType<int>(session_id)) {
+    UMALogDeviceAuthorizationTime(auth_start_time);
+    bad_message::ReceivedBadMessage(context_->render_process_id(),
+                                    bad_message::AOSI_OUT_OF_RANGE_INTEGER);
+    return;
+  }
+
+  context_->authorization_handler()->RequestDeviceAuthorization(
+      render_frame_id_, static_cast<int>(session_id), device_id, origin,
+      base::Bind(&AudioOutputServiceImpl::AuthorizationCompleted,
+                 base::Unretained(this), origin, auth_start_time,
+                 base::Passed(std::move(audio_output_request)), callback));
+}
+
+void AudioOutputServiceImpl::AuthorizationCompleted(
+    const url::Origin& origin,
+    base::TimeTicks auth_start_time,
+    media::mojom::AudioOutputRequest request,
+    const RequestDeviceAuthorizationCallback& callback,
+    media::OutputDeviceStatus status,
+    bool should_send_id,
+    const media::AudioParameters& params,
+    const std::string& raw_device_id) {
+  DCHECK_CURRENTLY_ON(BrowserThread::IO);
+  UMALogDeviceAuthorizationTime(auth_start_time);
+
+  if (status != media::OUTPUT_DEVICE_STATUS_OK) {
+    callback.Run(media::OutputDeviceStatus(status),
+                 media::AudioParameters::UnavailableDeviceParams(),
+                 std::string());
+    return;
+  }
+
+  if (request.is_pending()) {
+    audio_outputs_.push_back(base::MakeUnique<AudioOutputImpl>(
+        std::move(request), base::BindOnce(&AudioOutputServiceImpl::CloseStream,
+                                           base::Unretained(this)),
+        base::BindOnce(&AudioOutputServiceContext::CreateDelegate,
+                       base::Unretained(context_), raw_device_id,
+                       render_frame_id_)));
+  }
+
+  callback.Run(media::OutputDeviceStatus(status), params,
+               should_send_id ? MediaStreamManager::GetHMACForMediaDeviceID(
+                                    context_->salt(), origin, raw_device_id)
+                              : std::string());
+}
+
+void AudioOutputServiceImpl::CloseStream(AudioOutputImpl* audio_output) {
+  DCHECK_CURRENTLY_ON(BrowserThread::IO);
+  auto iter = std::find_if(
+      audio_outputs_.begin(), audio_outputs_.end(),
+      [audio_output](const std::unique_ptr<AudioOutputImpl>& other) {
+        return audio_output == other.get();
+      });
+  if (iter == audio_outputs_.end())
+    return;
+  std::swap(*iter, audio_outputs_.back());
+  audio_outputs_.pop_back();
+}
+
+}  // namespace content