/*
* 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.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. 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 INC. 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 WebAudioBus_h
#define WebAudioBus_h
#include "WebCommon.h"
namespace WebCore { class AudioBus; }
#if INSIDE_BLINK
namespace WTF { template <typename T> class PassRefPtr; }
#endif
namespace blink {
class WebAudioBusPrivate;
// A container for multi-channel linear PCM audio data.
//
// WARNING: It is not safe to pass a WebAudioBus across threads!!!
//
class BLINK_PLATFORM_EXPORT WebAudioBus {
public:
WebAudioBus() : m_private(0) { }
~WebAudioBus() { reset(); }
// initialize() allocates memory of the given length for the given number of channels.
void initialize(unsigned numberOfChannels, size_t length, double sampleRate);
// resizeSmaller() can only be called after initialize() with a new length <= the initialization length.
// The data stored in the bus will remain undisturbed.
void resizeSmaller(size_t newLength);
// reset() releases the memory allocated from initialize().
void reset();
unsigned numberOfChannels() const;
size_t length() const;
double sampleRate() const;
float* channelData(unsigned channelIndex);
#if INSIDE_BLINK
WTF::PassRefPtr<WebCore::AudioBus> release();
#endif
private:
// Disallow copy and assign.
WebAudioBus(const WebAudioBus&);
void operator=(const WebAudioBus&);
WebCore::AudioBus* m_private;
};
} // namespace blink
#endif // WebAudioBus_h