Migrate webkit/renderer/media/ to content/renderer/media/.

This moves everything except the crypto bits.

BUG=251306
R=jam@chromium.org

Review URL: https://codereview.chromium.org/18261007

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@210912 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 79 insertions, 0 deletions

diff --git a/content/renderer/media/webaudiosourceprovider_impl.h b/content/renderer/media/webaudiosourceprovider_impl.h
new file mode 100644
index 0000000..fd27697
--- /dev/null
+++ b/content/renderer/media/webaudiosourceprovider_impl.h
@@ -0,0 +1,79 @@
+// Copyright 2013 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.
+
+#ifndef CONTENT_RENDERER_MEDIA_WEBAUDIOSOURCEPROVIDER_IMPL_H_
+#define CONTENT_RENDERER_MEDIA_WEBAUDIOSOURCEPROVIDER_IMPL_H_
+
+#include "base/synchronization/lock.h"
+#include "content/common/content_export.h"
+#include "media/base/audio_renderer_sink.h"
+#include "third_party/WebKit/public/platform/WebVector.h"
+#include "third_party/WebKit/public/web/WebAudioSourceProvider.h"
+
+namespace WebKit {
+class WebAudioSourceProviderClient;
+}
+
+namespace content {
+
+// WebAudioSourceProviderImpl provides a bridge between classes:
+//     WebKit::WebAudioSourceProvider <---> media::AudioRendererSink
+//
+// WebAudioSourceProviderImpl wraps an existing audio sink that is used unless
+// WebKit has set a client via setClient(). While a client is set WebKit will
+// periodically call provideInput() to render a certain number of audio
+// sample-frames using the sink's RenderCallback to get the data.
+//
+// All calls are protected by a lock.
+class CONTENT_EXPORT WebAudioSourceProviderImpl
+    : NON_EXPORTED_BASE(public WebKit::WebAudioSourceProvider),
+      NON_EXPORTED_BASE(public media::AudioRendererSink) {
+ public:
+  explicit WebAudioSourceProviderImpl(
+      const scoped_refptr<media::AudioRendererSink>& sink);
+
+  // WebKit::WebAudioSourceProvider implementation.
+  virtual void setClient(WebKit::WebAudioSourceProviderClient* client);
+  virtual void provideInput(const WebKit::WebVector<float*>& audio_data,
+                            size_t number_of_frames);
+
+  // media::AudioRendererSink implementation.
+  virtual void Start() OVERRIDE;
+  virtual void Stop() OVERRIDE;
+  virtual void Play() OVERRIDE;
+  virtual void Pause() OVERRIDE;
+  virtual bool SetVolume(double volume) OVERRIDE;
+  virtual void Initialize(const media::AudioParameters& params,
+                          RenderCallback* renderer) OVERRIDE;
+
+ protected:
+  virtual ~WebAudioSourceProviderImpl();
+
+ private:
+  // Set to true when Initialize() is called.
+  int channels_;
+  int sample_rate_;
+  double volume_;
+
+  // Tracks the current playback state.
+  enum PlaybackState { kStopped, kStarted, kPlaying };
+  PlaybackState state_;
+
+  // Where audio comes from.
+  media::AudioRendererSink::RenderCallback* renderer_;
+
+  // When set via setClient() it overrides |sink_| for consuming audio.
+  WebKit::WebAudioSourceProviderClient* client_;
+
+  // Where audio ends up unless overridden by |client_|.
+  base::Lock sink_lock_;
+  scoped_refptr<media::AudioRendererSink> sink_;
+  scoped_ptr<media::AudioBus> bus_wrapper_;
+
+  DISALLOW_IMPLICIT_CONSTRUCTORS(WebAudioSourceProviderImpl);
+};
+
+}  // namespace content
+
+#endif  // CONTENT_RENDERER_MEDIA_WEBAUDIOSOURCEPROVIDER_IMPL_H_