Cast: Basic cast_receiver API for chrome.

chrome/renderer/media/cast_receiver_audio_valve.cc

+// Copyright 2015 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 "chrome/renderer/media/cast_receiver_audio_valve.h"
+
+CastReceiverAudioValve::CastReceiverAudioValve(
+    media::AudioCapturerSource::CaptureCallback* cb)
+    : cb_(cb) {
+}
+CastReceiverAudioValve::~CastReceiverAudioValve() {}
+
+void CastReceiverAudioValve::Capture(const media::AudioBus* audio_source,
+                                     int audio_delay_milliseconds,
+                                     double volume,
+                                     bool key_pressed) {
+  base::AutoLock lock(lock_);
+  if (cb_) {
+    cb_->Capture(audio_source, audio_delay_milliseconds, volume, key_pressed);
+  }
+}
+
+void CastReceiverAudioValve::OnCaptureError() {
+  base::AutoLock lock(lock_);
+  if (cb_) {
+    cb_->OnCaptureError();
+  }
+}
+
+void CastReceiverAudioValve::Stop() {
+  base::AutoLock lock(lock_);
+  cb_ = nullptr;
+}