Index: third_party/WebKit/Source/platform/audio/AudioPullFIFO.cpp |
diff --git a/third_party/WebKit/Source/platform/audio/AudioPullFIFO.cpp b/third_party/WebKit/Source/platform/audio/AudioPullFIFO.cpp |
new file mode 100644 |
index 0000000000000000000000000000000000000000..ca14cfac259e0a9d929445045eeb18fc2642bc79 |
--- /dev/null |
+++ b/third_party/WebKit/Source/platform/audio/AudioPullFIFO.cpp |
@@ -0,0 +1,69 @@ |
+/* |
+ * Copyright (C) 2012 Google Inc. All rights reserved. |
+ * |
+ * Redistribution and use in source and binary forms, with or without |
+ * modification, are permitted provided that the following conditions |
+ * are met: |
+ * |
+ * 1. Redistributions of source code must retain the above copyright |
+ * notice, this list of conditions and the following disclaimer. |
+ * 2. Redistributions in binary form must reproduce the above copyright |
+ * notice, this list of conditions and the following disclaimer in the |
+ * documentation and/or other materials provided with the distribution. |
+ * 3. Neither the name of Apple Computer, Inc. ("Apple") nor the names of |
+ * its contributors may be used to endorse or promote products derived |
+ * from this software without specific prior written permission. |
+ * |
+ * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY |
+ * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED |
+ * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE |
+ * DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY |
+ * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES |
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; |
+ * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND |
+ * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
+ */ |
+ |
+#include "platform/audio/AudioPullFIFO.h" |
+ |
+namespace blink { |
+ |
+AudioPullFIFO::AudioPullFIFO(AudioSourceProvider& audioProvider, |
+ unsigned numberOfChannels, |
+ size_t fifoLength, |
+ size_t providerSize) |
+ : m_provider(audioProvider), |
+ m_fifo(numberOfChannels, fifoLength), |
+ m_providerSize(providerSize), |
+ m_tempBus(AudioBus::create(numberOfChannels, providerSize)) {} |
+ |
+void AudioPullFIFO::consume(AudioBus* destination, size_t framesToConsume) { |
+ if (!destination) |
+ return; |
+ |
+ if (framesToConsume > m_fifo.framesInFifo()) { |
+ // We don't have enough data in the FIFO to fulfill the request. Ask for |
+ // more data. |
+ fillBuffer(framesToConsume - m_fifo.framesInFifo()); |
+ } |
+ |
+ m_fifo.consume(destination, framesToConsume); |
+} |
+ |
+void AudioPullFIFO::fillBuffer(size_t numberOfFrames) { |
+ // Keep asking the provider to give us data until we have received at least |
+ // |numberOfFrames| of data. Stuff the data into the FIFO. |
+ size_t framesProvided = 0; |
+ |
+ while (framesProvided < numberOfFrames) { |
+ m_provider.provideInput(m_tempBus.get(), m_providerSize); |
+ |
+ m_fifo.push(m_tempBus.get()); |
+ |
+ framesProvided += m_providerSize; |
+ } |
+} |
+ |
+} // namespace blink |