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Unified Diff: content/renderer/render_audiosourceprovider.cc

Issue 7631033: Very early implementation for HTMLMediaElement / Web Audio API integration (Closed) Base URL: svn://svn.chromium.org/chrome/trunk/src/
Patch Set: '' Created 9 years, 4 months ago
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Index: content/renderer/render_audiosourceprovider.cc
===================================================================
--- content/renderer/render_audiosourceprovider.cc (revision 0)
+++ content/renderer/render_audiosourceprovider.cc (revision 0)
@@ -0,0 +1,58 @@
+// Copyright (c) 2010 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/render_audiosourceprovider.h"
+
+#include "base/basictypes.h"
+#include "base/logging.h"
+
+using namespace std;
+using WebKit::WebVector;
+
+RenderAudioSourceProvider::RenderAudioSourceProvider(
+ media::AudioRendererSink::RenderCallback* callback)
+ : is_running_(false),
+ volume_(1.0),
+ callback_(callback) {
+ callback->SetAudioRendererSink(this);
+}
+
+bool RenderAudioSourceProvider::Start() {
+ if (!is_running_) {
+ is_running_ = true;
+ }
+ return true;
+}
+
+bool RenderAudioSourceProvider::Stop() {
+ if (is_running_) {
+ is_running_ = false;
+ }
+ return true;
+}
+
+bool RenderAudioSourceProvider::SetVolume(double volume) {
+ volume_ = volume;
+ return true;
+}
+
+void RenderAudioSourceProvider::provideInput(
+ const WebVector<float*>& audio_data, size_t number_of_frames) {
+ DCHECK(callback_);
+ if (callback_ && is_running_) {
+ // Wrap WebVector as regular std::vector.
+ vector<float*> v(audio_data.size());
+ for (size_t i = 0; i < audio_data.size(); ++i)
+ v[i] = audio_data[i];
+
+ // TODO(crogers): figure out if we should volume scale here or in common
+ // WebAudio code.
+ callback_->Render(v, number_of_frames, 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(float) * number_of_frames);
+ }
+ }
+}
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