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include/cinder/audio/CocoaCaConverter.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 <CoreAudio/CoreAudioTypes.h>
00030 #include <AudioToolbox/AudioConverter.h>
00031 
00032 namespace cinder { namespace audio {
00033 
00034 class CocoaCaConverter {
00035  public:
00036     typedef void (*LoaderFunction)( Loader * aLoader, uint32_t *ioSampleCount, BufferList *ioData, AudioStreamPacketDescription * packetDescriptions );
00037     
00038     CocoaCaConverter( Loader *aLoader, LoaderFunction loaderFn, const AudioStreamBasicDescription& sourceDescription, const AudioStreamBasicDescription& targetDescription, uint32_t maxPacketSize );
00039     ~CocoaCaConverter();
00040     
00041     void loadData( uint32_t *ioSampleCount, BufferList *ioData );
00042  private:
00043     static void fillBufferListFromCaBufferList( BufferList * aBufferList, const AudioBufferList * caBufferList );
00044     static shared_ptr<AudioBufferList> createCaBufferList( const BufferList * caBufferList );
00045     static OSStatus dataInputCallback( AudioConverterRef inAudioConverter, UInt32 *ioNumberDataPackets, AudioBufferList *ioData, AudioStreamPacketDescription **outDataPacketDescriptions, void *audioLoader );
00046  
00047     void cleanupPacketDescriptions();
00048     void cleanupConverterBuffer();
00049     
00050     uint32_t                        mMaxPacketSize;
00051     Loader                          * mLoader;
00052     LoaderFunction                  mLoaderFunction;
00053     AudioConverterRef               mConverter;
00054     AudioStreamPacketDescription    * mCurrentPacketDescriptions;
00055     BufferList                      mConverterBuffer;
00056 };
00057 
00058 }} //namespace