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# include/cinder/audio/Callback.h

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    00001 /*
    00002  Copyright (c) 2009, The Barbarian Group
    00003  All rights reserved.
    00004
    00005  Redistribution and use in source and binary forms, with or without modification, are permitted provided that
    00006  the following conditions are met:
    00007
    00008     * Redistributions of source code must retain the above copyright notice, this list of conditions and
    00009     the following disclaimer.
    00010     * Redistributions in binary form must reproduce the above copyright notice, this list of conditions and
    00011     the following disclaimer in the documentation and/or other materials provided with the distribution.
    00012
    00013  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED
    00014  WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
    00015  PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR
    00016  ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
    00017  TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
    00018  HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
    00019  NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
    00020  POSSIBILITY OF SUCH DAMAGE.
    00021 */
    00022
    00023 #pragma once
    00024
    00025 #include "cinder/Cinder.h"
    00026 #include "cinder/audio/Io.h"
    00027 #include "cinder/audio/Buffer.h"
    00028
    00029 #include <iostream>
    00030
    00031 namespace cinder { namespace audio {
    00032
    00033 typedef shared_ptr<class SourceCallback>    SourceCallbackRef;
    00034 typedef shared_ptr<class LoaderSourceCallback>  LoaderSourceFileRef;
    00035
    00036 //TODO: maybe change this to use a cinder Audio buffer that you fill?
    00037 typedef void (*CallbackFunction)( uint64_t inSampleOffset, uint32_t *ioSampleCount, Buffer *ioBuffer );
    00038
    00039 class Callback {
    00040   private:
    00041     struct Obj {
    00042         Obj( CallbackFunction aCallback, uint32_t aSampleRate, uint16_t aChannelCount, uint16_t aBitsPerSample, uint16_t aBlockAlign );
    00043         ~Obj();
    00044         CallbackFunction    mCallback;
    00045         uint32_t            mSampleRate;
    00046         uint16_t            mChannelCount;
    00047         uint16_t            mBitsPerSample; //Significant Bits Per Sample
    00048         uint16_t            mBlockAlign;
    00049     };
    00050
    00051   public:
    00052     Callback() {}
    00053     Callback( CallbackFunction aCallback, uint32_t aSampleRate = 44100, uint16_t aChannelCount = 2, uint16_t aBitsPerSample = 32, uint16_t aBlockAlign = 8 );
    00054     ~Callback() {}
    00055
    00056     operator SourceRef() const;
    00057
    00058     uint32_t getSampleRate() const { return mObj->mSampleRate; }
    00059     uint16_t getChannelCount() const { return mObj->mChannelCount; }
    00060     uint16_t getBitsPerSample() const { return mObj->mBitsPerSample; }
    00061     uint16_t getBlockAlign() const { return mObj->mBlockAlign; }
    00062   private:
    00063     shared_ptr<Callback::Obj> mObj;
    00064
    00065     friend class SourceCallback;
    00066   public:
    00068
    00069     Callback( const Callback &other ) { mObj = other.mObj; }
    00070     Callback& operator=( const Callback &other ) { mObj = other.mObj; return *this; }
    00071     bool operator==( const Callback &other ) { return mObj == other.mObj; }
    00072     typedef shared_ptr<Obj> Callback::*unspecified_bool_type;
    00073     operator unspecified_bool_type() { return ( mObj.get() == 0 ) ? 0 : &Callback::mObj; }
    00074     void reset() { mObj.reset(); }
    00076 };
    00077
    00078 }} //namespace