Index: third_party/WebKit/Source/platform/audio/PushPullFIFO.h |
diff --git a/third_party/WebKit/Source/platform/audio/PushPullFIFO.h b/third_party/WebKit/Source/platform/audio/PushPullFIFO.h |
deleted file mode 100644 |
index 2341372f35ab452fb8814dc22208ff3c24e9cd87..0000000000000000000000000000000000000000 |
--- a/third_party/WebKit/Source/platform/audio/PushPullFIFO.h |
+++ /dev/null |
@@ -1,85 +0,0 @@ |
-// Copyright 2017 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 PushPullFIFO_h |
-#define PushPullFIFO_h |
- |
-#include "platform/audio/AudioBus.h" |
-#include "public/platform/WebCommon.h" |
-#include "wtf/Allocator.h" |
- |
-namespace blink { |
- |
-// A configuration data container for PushPullFIFO unit test. |
-struct PushPullFIFOStateForTest { |
- const size_t fifoLength; |
- const unsigned numberOfChannels; |
- const size_t framesAvailable; |
- const size_t indexRead; |
- const size_t indexWrite; |
- const unsigned overflowCount; |
- const unsigned underflowCount; |
-}; |
- |
-// PushPullFIFO class is an intermediate audio sample storage between |
-// Blink-WebAudio and the renderer. The renderer's hardware callback buffer size |
-// varies on the platform, but the WebAudio always renders 128 frames (render |
-// quantum, RQ) thus FIFO is needed to handle the general case. |
-class BLINK_PLATFORM_EXPORT PushPullFIFO { |
- USING_FAST_MALLOC(PushPullFIFO); |
- WTF_MAKE_NONCOPYABLE(PushPullFIFO); |
- |
- public: |
- // Maximum FIFO length. (512 render quanta) |
- static const size_t kMaxFIFOLength; |
- |
- // |fifoLength| cannot exceed |kMaxFIFOLength|. Otherwise it crashes. |
- explicit PushPullFIFO(unsigned numberOfChannels, size_t fifoLength); |
- ~PushPullFIFO(); |
- |
- // Pushes the rendered frames by WebAudio engine. |
- // - The |inputBus| length is 128 frames (1 render quantum), fixed. |
- // - In case of overflow (FIFO full while push), the existing frames in FIFO |
- // will be overwritten and |indexRead| will be forcibly moved to |
- // |indexWrite| to avoid reading overwritten frames. |
- void push(const AudioBus* inputBus); |
- |
- // Pulling |framesRequested| by the audio device thread. |
- // - If |framesRequested| is bigger than the length of |outputBus|, it |
- // violates SECURITY_CHECK(). |
- // - If |framesRequested| is bigger than FIFO length, it violates |
- // SECURITY_CHECK(). |
- // - In case of underflow (FIFO empty while pull), the remaining space in the |
- // requested output bus will be filled with silence. Thus it will fulfill |
- // the request from the consumer without causing error, but with a glitch. |
- void pull(AudioBus* outputBus, size_t framesRequested); |
- |
- size_t framesAvailable() const { return m_framesAvailable; } |
- size_t length() const { return m_fifoLength; } |
- unsigned numberOfChannels() const { return m_fifoBus->numberOfChannels(); } |
- AudioBus* bus() const { return m_fifoBus.get(); } |
- |
- // For unit test. Get the current configuration that consists of FIFO length, |
- // number of channels, read/write index position and under/overflow count. |
- const PushPullFIFOStateForTest getStateForTest() const; |
- |
- private: |
- // The size of the FIFO. |
- const size_t m_fifoLength = 0; |
- |
- RefPtr<AudioBus> m_fifoBus; |
- |
- // The number of frames in the FIFO actually available for pulling. |
- size_t m_framesAvailable; |
- |
- size_t m_indexRead; |
- size_t m_indexWrite; |
- |
- unsigned m_overflowCount; |
- unsigned m_underflowCount; |
-}; |
- |
-} // namespace blink |
- |
-#endif // PushPullFIFO_h |