/*
 * 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 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
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 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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 */

#ifndef AudioSourceProvider_h
#define AudioSourceProvider_h

namespace WebCore {

class AudioBus;
class AudioSourceProviderClient;
    
// Abstract base-class for a pull-model client.
class AudioSourceProvider {
public:
    // provideInput() gets called repeatedly to render time-slices of a continuous audio stream.
    virtual void provideInput(AudioBus* bus, size_t framesToProcess) = 0;

    // If a client is set, we call it back when the audio format is available or changes.
    virtual void setClient(AudioSourceProviderClient*) { };

    virtual ~AudioSourceProvider() = default;
};

} // WebCore

#endif // AudioSourceProvider_h
