/*
     File: AudioFileFormat.h
 Abstract: Part of CoreAudio Utility Classes
  Version: 1.1
 
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*/
#ifndef _AudioFileFormat_H_
#define _AudioFileFormat_H_

#include "AudioFileObject.h"

// AudioFileFormat is a factory class for AudioFileObjects. 

// UncertainResult is needed for DataIsThisFormat. 
// In the case of SoundDesigner 2 we can't determine if the data is SoundDesigner 2 or not.

typedef int UncertainResult;

enum {
	kFalse = 0,
	kTrue = 1,
	kCantDetermine = -1
};

class AudioFileHandle;
class AudioFileFormat;
class AudioFileFormatComponent;

class AudioFileFormatBase
{
public:
	AudioFileFormatBase(UInt32 inFileType);
	virtual ~AudioFileFormatBase();
	
	// return true if extension is of this format type
	virtual Boolean ExtensionIsThisFormat(CFStringRef inExtension) = 0;
	
	virtual UncertainResult FileDataIsThisFormat(
				UInt32								/*inDataByteSize*/,
				const void*							/*inData*/) = 0;
	
	// support SoundDesigner II files while minimizing opening and closing files.
	virtual Boolean ResourceIsThisFormat(const FSRef* /*inRef*/) { return false; }

	UInt32 GetFileType() const { return mFileType; }
	
	virtual UInt32 CanRead() const { return 1; }
	virtual UInt32 CanWrite() const { return 1; }
	virtual UInt32 HasResourceFork() const { return 0; }
	
	virtual void GetExtensions(CFArrayRef *outArray) = 0;
	virtual void GetUTIs(CFArrayRef *outArray) {}
	virtual void GetMIMETypes(CFArrayRef *outArray) {}
	virtual void GetFileTypeName(CFStringRef *outName) = 0;
	virtual OSStatus GetAvailableFormatIDs(UInt32* ioDataSize, void* outPropertyData) = 0;
	virtual OSStatus GetAvailableStreamDescriptions(UInt32 inFormatID, UInt32* ioDataSize, void* outPropertyData) = 0;
	virtual OSStatus GetHFSCodes(UInt32* ioDataSize, void* outPropertyData);
	
	virtual AudioFileFormat* AsAudioFileFormat() { return NULL; }
	virtual AudioFileFormatComponent* AsAudioFileFormatComponent() { return NULL; }
		
private:
	 UInt32 mFileType;
};

class AudioFileStreamObject;

class AudioFileFormat : public AudioFileFormatBase
{
public:
	AudioFileFormat(UInt32 inFileType);
	virtual ~AudioFileFormat();
	
	// create an AudioFileObject for this format type.
	virtual AudioFileObject* New() = 0; 
	virtual AudioFileStreamObject* NewStream() { return NULL; }
	
	// return true if file is of this format type
	virtual UncertainResult FileDataIsThisFormat(UInt32 inDataByteSize, const void* inData) = 0;				

	virtual AudioFileFormat* AsAudioFileFormat() { return this; }
};


#endif