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/*
* Copyright (C) 2010 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.
*/
#ifndef THIRD_PARTY_BLINK_PUBLIC_PLATFORM_WEB_AUDIO_DEVICE_H_
#define THIRD_PARTY_BLINK_PUBLIC_PLATFORM_WEB_AUDIO_DEVICE_H_
#include "third_party/blink/public/platform/web_common.h"
#include "third_party/blink/public/platform/web_vector.h"
namespace blink {
// Abstract interface to the Chromium audio system.
class WebAudioDevice {
public:
class BLINK_PLATFORM_EXPORT RenderCallback {
public:
// Note: |delay| and |delay_timestamp| arguments are high-precision
// measurements of the state of the system in the recent past. To be clear,
// |delay| does *not* represent the point-in-time at which the first
// rendered sample will be played out.
virtual void Render(const WebVector<float*>& destination_data,
size_t number_of_frames,
double delay, // Output delay in seconds.
double delay_timestamp, // System timestamp in seconds
// when |delay| was obtained.
size_t prior_frames_skipped);
protected:
virtual ~RenderCallback();
};
virtual ~WebAudioDevice() = default;
virtual void Start() = 0;
virtual void Stop() = 0;
// Pause an audio device so that the device doesn't produce
// requests for audio frames. This is used when a web frame is
// frozen. This shouldn't be observable to the web application.
virtual void Pause() = 0;
// Resume an audio device that was previously paused. Used
// for frozen frames.
virtual void Resume() = 0;
virtual double SampleRate() = 0;
virtual int FramesPerBuffer() = 0;
};
} // namespace blink
#endif // THIRD_PARTY_BLINK_PUBLIC_PLATFORM_WEB_AUDIO_DEVICE_H_
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