Refactor content::RenderAudioSourceProvider as webkit_media::WebAudioSourceProviderImpl.

content/renderer/media/render_audiosourceprovider.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/render_audiosourceprovider.h"
-
-#include <vector>
-
-#include "base/basictypes.h"
-#include "base/command_line.h"
-#include "base/logging.h"
-#include "content/renderer/media/audio_device_factory.h"
-#include "content/renderer/media/audio_renderer_mixer_manager.h"
-#include "content/renderer/media/renderer_audio_output_device.h"
-#include "content/renderer/render_thread_impl.h"
-#include "media/base/audio_renderer_mixer_input.h"
-#include "media/base/media_switches.h"
-#include "third_party/WebKit/Source/WebKit/chromium/public/WebAudioSourceProviderClient.h"
-
-using std::vector;
-using WebKit::WebVector;
-
-namespace content {
-
-RenderAudioSourceProvider::RenderAudioSourceProvider(int source_render_view_id)
-    : is_initialized_(false),
-      channels_(0),
-      sample_rate_(0),
-      is_running_(false),
-      renderer_(NULL),
-      client_(NULL) {
-  // We create an AudioRendererSink here, but we don't yet know the audio format
-  // (sample-rate, etc.) at this point.  Later, when Initialize() is called, we
-  // have the audio format information and call AudioRendererSink::Initialize()
-  // to fully initialize it.
-  const CommandLine* cmd_line = CommandLine::ForCurrentProcess();
-#if defined(OS_WIN) || defined(OS_MACOSX)
-  const bool use_mixing =
-      !cmd_line->HasSwitch(switches::kDisableRendererSideMixing);
-#else
-  const bool use_mixing =
-      cmd_line->HasSwitch(switches::kEnableRendererSideMixing);
-#endif
-
-  if (use_mixing) {
-    default_sink_ = RenderThreadImpl::current()->
-        GetAudioRendererMixerManager()->CreateInput(source_render_view_id);
-    DVLOG(1) << "Using AudioRendererMixerManager-provided sink: "
-             << default_sink_.get();
-  } else {
-    scoped_refptr<RendererAudioOutputDevice> device =
-        AudioDeviceFactory::NewOutputDevice();
-    // The RenderView creating RenderAudioSourceProvider will be the source of
-    // the audio (WebMediaPlayer is always associated with a document in a frame
-    // at the time RenderAudioSourceProvider is instantiated).
-    device->SetSourceRenderView(source_render_view_id);
-    default_sink_ = device;
-    DVLOG(1) << "Using AudioDeviceFactory-provided sink: "
-             << default_sink_.get();
-  }
-}
-
-void RenderAudioSourceProvider::setClient(
-    WebKit::WebAudioSourceProviderClient* client) {
-  // Synchronize with other uses of client_ and default_sink_.
-  base::AutoLock auto_lock(sink_lock_);
-
-  if (client && client != client_) {
-    // Detach the audio renderer from normal playback.
-    default_sink_->Stop();
-
-    // The client will now take control by calling provideInput() periodically.
-    client_ = client;
-
-    if (is_initialized_) {
-      // The client needs to be notified of the audio format, if available.
-      // If the format is not yet available, we'll be notified later
-      // when Initialize() is called.
-
-      // Inform WebKit about the audio stream format.
-      client->setFormat(channels_, sample_rate_);
-    }
-  } else if (!client && client_) {
-    // Restore normal playback.
-    client_ = NULL;
-    // TODO(crogers): We should call default_sink_->Play() if we're
-    // in the playing state.
-  }
-}
-
-void RenderAudioSourceProvider::provideInput(
-    const WebVector<float*>& audio_data, size_t number_of_frames) {
-  DCHECK(client_);
-
-  if (renderer_ && is_initialized_ && is_running_) {
-    // Wrap WebVector as std::vector.
-    vector<float*> v(audio_data.size());
-    for (size_t i = 0; i < audio_data.size(); ++i)
-      v[i] = audio_data[i];
-
-    scoped_ptr<media::AudioBus> audio_bus = media::AudioBus::WrapVector(
-        number_of_frames, v);
-
-    // TODO(crogers): figure out if we should volume scale here or in common
-    // WebAudio code.  In any case we need to take care of volume.
-    renderer_->Render(audio_bus.get(), 0);
-  } else {
-    // Provide silence if the source is not running.
-    for (size_t i = 0; i < audio_data.size(); ++i)
-      memset(audio_data[i], 0, sizeof(*audio_data[0]) * number_of_frames);
-  }
-}
-
-void RenderAudioSourceProvider::Start() {
-  base::AutoLock auto_lock(sink_lock_);
-  if (!client_)
-    default_sink_->Start();
-  is_running_ = true;
-}
-
-void RenderAudioSourceProvider::Stop() {
-  base::AutoLock auto_lock(sink_lock_);
-  if (!client_)
-    default_sink_->Stop();
-  is_running_ = false;
-}
-
-void RenderAudioSourceProvider::Play() {
-  base::AutoLock auto_lock(sink_lock_);
-  if (!client_)
-    default_sink_->Play();
-  is_running_ = true;
-}
-
-void RenderAudioSourceProvider::Pause(bool flush) {
-  base::AutoLock auto_lock(sink_lock_);
-  if (!client_)
-    default_sink_->Pause(flush);
-  is_running_ = false;
-}
-
-bool RenderAudioSourceProvider::SetVolume(double volume) {
-  base::AutoLock auto_lock(sink_lock_);
-  if (!client_)
-    default_sink_->SetVolume(volume);
-  return true;
-}
-
-void RenderAudioSourceProvider::Initialize(
-    const media::AudioParameters& params,
-    RenderCallback* renderer) {
-  base::AutoLock auto_lock(sink_lock_);
-  CHECK(!is_initialized_);
-  renderer_ = renderer;
-
-  default_sink_->Initialize(params, renderer);
-
-  // Keep track of the format in case the client hasn't yet been set.
-  channels_ = params.channels();
-  sample_rate_ = params.sample_rate();
-
-  if (client_) {
-    // Inform WebKit about the audio stream format.
-    client_->setFormat(channels_, sample_rate_);
-  }
-
-  is_initialized_ = true;
-}
-
-RenderAudioSourceProvider::~RenderAudioSourceProvider() {}
-
-}  // namespace content