livetrax/libs/appleutility/CoreAudio/PublicUtility/CAExtAudioFile.h

/*
     File: CAExtAudioFile.h
 Abstract: Part of CoreAudio Utility Classes
  Version: 1.1
 
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 MAKES NO WARRANTIES, EXPRESS OR IMPLIED, INCLUDING WITHOUT LIMITATION
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*/
#ifndef __CAExtAudioFile_h__
#define __CAExtAudioFile_h__

#include <TargetConditionals.h>

#if !defined(__COREAUDIO_USE_FLAT_INCLUDES__)
	#include <AudioToolbox/ExtendedAudioFile.h>
	#include <AudioToolbox/AudioConverter.h>
#else
	#include "ExtendedAudioFile.h"
	#include "AudioConverter.h"
#endif
#include "CAXException.h"
//#include "CAAutoDisposer.h"
#include "CAStreamBasicDescription.h"
#include "CAAudioChannelLayout.h"
#include "CACFObject.h"

// A C++ wrapper for ExtAudioFile
// Error returns throw CAXExceptions.
class CAExtAudioFile {
public:
	// instances are not automatically associated with open files.
	CAExtAudioFile() :
		mExtAudioFile(NULL) { }

	virtual ~CAExtAudioFile()
	{
		Close();
	}
	
	bool IsValid() const { return mExtAudioFile != NULL; }
	
	void	Open(const char* filename)
	{
		Close();
		CFURLRef url = CFURLCreateFromFileSystemRepresentation(kCFAllocatorDefault, (const UInt8*)filename, strlen(filename), false);
		XThrowIf(!url, -1, "couldn't convert path to CFURLRef");
		OSStatus res = ExtAudioFileOpenURL(url, &mExtAudioFile);
		if (res)
			CFRelease(url);
		Check(res, "ExtAudioFileOpenURL");
		CFRelease (url);
	}
	
	// this group of methods maps directly to the API other than OSStatus results translating into exceptions.
	// you must explicitly open, wrap or create a file.
	void	OpenURL(CFURLRef url)
	{
		Close();
		Check(ExtAudioFileOpenURL(url, &mExtAudioFile), "ExtAudioFileOpenURL");
	}
		
	void	WrapAudioFileID(AudioFileID inFileID, Boolean forWriting)
	{
		Close();
		Check(ExtAudioFileWrapAudioFileID(inFileID, forWriting, &mExtAudioFile), "ExtAudioFileWrapAudioFileID");
	}

	void	Create(const char *filePath, AudioFileTypeID filetype, const AudioStreamBasicDescription &streamDesc, const AudioChannelLayout *channelLayout, UInt32 flags)
	{
		CFURLRef url = CFURLCreateFromFileSystemRepresentation(NULL, (const UInt8 *)filePath, strlen(filePath), false);
		XThrowIf(!url, -1, "couldn't convert path to CFURLRef");
		Close();
		OSStatus res = ExtAudioFileCreateWithURL(url, filetype, &streamDesc, channelLayout, flags, &mExtAudioFile);
		if (res)
			CFRelease(url);
		Check(res, "ExtAudioFileCreateWithURL");
		CFRelease(url);
	}
	
	void	CreateWithURL(CFURLRef url, AudioFileTypeID filetype, const AudioStreamBasicDescription &streamDesc, const AudioChannelLayout *channelLayout, UInt32 flags)
	{
		Close();
		Check(ExtAudioFileCreateWithURL(url, filetype, &streamDesc, channelLayout, flags, &mExtAudioFile), "ExtAudioFileCreateWithURL");
	}

	// you may explicitly close a file, or have it closed automatically by the destructor.
	void	Close()
	{
		if (mExtAudioFile != NULL) {
			Check(ExtAudioFileDispose(mExtAudioFile), "ExtAudioFileClose");
			mExtAudioFile = NULL;
		}
	}
	
	void	Read(UInt32 &ioNumberFrames, AudioBufferList *ioData)
	{
		Check(ExtAudioFileRead(mExtAudioFile, &ioNumberFrames, ioData), "ExtAudioFileRead");
	}
	
	OSStatus	Write(UInt32 inNumberFrames, const AudioBufferList *ioData)
	{
		OSStatus err = ExtAudioFileWrite(mExtAudioFile, inNumberFrames, ioData);
		switch (err) {
			// noErr and certain special errors are returned without an exception
		case noErr:
			break;
	#if TARGET_OS_IPHONE
		case kExtAudioFileError_CodecUnavailableInputConsumed:
		case kExtAudioFileError_CodecUnavailableInputNotConsumed:
			break;
	#endif
		default:
			// throw an exception
			Check(err, "ExtAudioFileWrite");
			break;
		}
		return err;
	}
	
	void	WriteAsync(UInt32 inNumberFrames, const AudioBufferList *ioData)
	{
		Check(ExtAudioFileWriteAsync(mExtAudioFile, inNumberFrames, ioData), "ExtAudioFileWriteAsync");
	}
	
	void	Seek(SInt64 inFrameOffset)
	{
		Check(ExtAudioFileSeek(mExtAudioFile, inFrameOffset), "ExtAudioFileSeek");
	}
	
	SInt64	Tell() const
	{
		SInt64 pos;
		Check(ExtAudioFileTell(mExtAudioFile, &pos), "ExtAudioFileTell");
		return pos;
	}
	
	UInt32	GetPropertyInfo(ExtAudioFilePropertyID propid, Boolean *outWritable) const
	{
		UInt32 size;
		CheckProperty(ExtAudioFileGetPropertyInfo(mExtAudioFile, propid, &size, outWritable), "ExtAudioFileGetPropertyInfo", propid);
		return size;
	}
	
	void	GetProperty(ExtAudioFilePropertyID propid, UInt32 &ioSize, void *outData) const
	{
		CheckProperty(ExtAudioFileGetProperty(mExtAudioFile, propid, &ioSize, outData), "ExtAudioFileGetProperty", propid);
	}
	
	void	SetProperty(ExtAudioFilePropertyID propid, UInt32 size, const void *inData)
	{
		CheckProperty(ExtAudioFileSetProperty(mExtAudioFile, propid, size, inData), "ExtAudioFileSetProperty", propid);
	}
	
	const CAAudioChannelLayout &GetFileChannelLayout()
	{
		return FetchChannelLayout(mFileChannelLayout, kExtAudioFileProperty_FileChannelLayout);
	}

	void	SetFileChannelLayout(const CAAudioChannelLayout &layout) {
		SetProperty(kExtAudioFileProperty_FileChannelLayout, layout.Size(), &layout.Layout());
	}

	const CAStreamBasicDescription &GetFileDataFormat()
	{
		UInt32 size = sizeof(mFileDataFormat);
		GetProperty(kExtAudioFileProperty_FileDataFormat, size, &mFileDataFormat);
		return mFileDataFormat;
	}
	
	const CAStreamBasicDescription &GetClientDataFormat() {
		UInt32 size = sizeof(mClientDataFormat);
		GetProperty(kExtAudioFileProperty_ClientDataFormat, size, &mClientDataFormat);
		return mClientDataFormat;
	}
	

	void	SetClientFormat(const CAStreamBasicDescription &dataFormat, const CAAudioChannelLayout *layout=NULL, UInt32 codecManuf=0) {
		if (codecManuf != 0)
			SetProperty('cman' /*kExtAudioFileProperty_CodecManufacturer*/, sizeof(codecManuf), &codecManuf);
		SetProperty(kExtAudioFileProperty_ClientDataFormat, sizeof(dataFormat), &dataFormat);
		if (layout)
			SetClientChannelLayout(*layout);
	}
	
	void	SetClientChannelLayout(const CAAudioChannelLayout &layout) {
		SetProperty(kExtAudioFileProperty_ClientChannelLayout, layout.Size(), &layout.Layout());
	}
	
	AudioConverterRef				GetConverter() const {
		UInt32 size = sizeof(AudioConverterRef);
		AudioConverterRef converter = NULL;
		GetProperty(kExtAudioFileProperty_AudioConverter, size, &converter);
		return converter;
	}

	bool	HasConverter() const { return GetConverter() != NULL; }
	
	OSStatus	SetConverterProperty(AudioConverterPropertyID inPropertyID,	UInt32 inPropertyDataSize, const void *inPropertyData, bool inCanFail=false)
	{
		OSStatus err = AudioConverterSetProperty(GetConverter(), inPropertyID, inPropertyDataSize, inPropertyData);
		if (!inCanFail)
			XThrowIfError(err, "Couldn't set audio converter property");
		if (!err) {
			// must tell the file that we have changed the converter; a NULL converter config is sufficient
			CFPropertyListRef config = NULL;
			SetProperty(kExtAudioFileProperty_ConverterConfig, sizeof(CFPropertyListRef), &config);
		}
		return err;
	}
	
	SInt64		GetNumberFrames() {
		SInt64 length;
		UInt32 size = sizeof(SInt64);
		GetProperty(kExtAudioFileProperty_FileLengthFrames, size, &length);
		return length;
	}
	

protected:
	virtual void Check(OSStatus err, const char *func) const
	{
		if (err) {
			char txt[128];
			snprintf(txt, sizeof(txt), "%s failed", func);
			throw CAXException(txt, err);
		}
	}
	
	virtual void CheckProperty(OSStatus err, const char *func, UInt32 propid) const
	{
		if (err) {
			char txt[128];
			char propstr[] = CA4CCToCString(propid);
			snprintf(txt, sizeof(txt), "%s ('%s') failed", func, propstr);
			throw CAXException(txt, err);
		}
	}

	const CAAudioChannelLayout &	FetchChannelLayout(CAAudioChannelLayout &layoutObj, ExtAudioFilePropertyID propID) {
		UInt32 size = GetPropertyInfo(propID, NULL);
		CAAutoFree<AudioChannelLayout> layout;
		layout.allocBytes(size);
		GetProperty(propID, size, layout);
		layoutObj = layout;
		return layoutObj;
	}

private:
	CAExtAudioFile(const CAExtAudioFile &) { }	// prohibit
	CAExtAudioFile & operator = (const CAExtAudioFile &) { return *this; } // prohibit

private:
	ExtAudioFileRef				mExtAudioFile;
	
	// for convenience to the client, it helps if we hold onto some storage for these
	CAStreamBasicDescription	mFileDataFormat;
	CAAudioChannelLayout		mFileChannelLayout;
	CAStreamBasicDescription	mClientDataFormat;
};


#endif // __CAExtAudioFile_h__