CAStreamBasicDescription.h

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#ifndef __CAStreamBasicDescription_h__
#define __CAStreamBasicDescription_h__

#if !defined(__COREAUDIO_USE_FLAT_INCLUDES__)
	#include <CoreAudio/CoreAudioTypes.h>
	#include <CoreFoundation/CoreFoundation.h>
#else
	#include "CoreAudioTypes.h"
	#include "CoreFoundation.h"
#endif

#include "CADebugMacros.h"
#include <string.h>	// for memset, memcpy
#include <stdio.h>	// for FILE *

#pragma mark	This file needs to compile on more earlier versions of the OS, so please keep that in mind when editing it

extern char *CAStringForOSType (OSType t, char *writeLocation);

// define Leopard specific symbols for backward compatibility if applicable
#if COREAUDIOTYPES_VERSION < 1050
typedef Float32 AudioSampleType;
enum { kAudioFormatFlagsCanonical = kAudioFormatFlagIsFloat | kAudioFormatFlagsNativeEndian | kAudioFormatFlagIsPacked };
#endif
#if COREAUDIOTYPES_VERSION < 1051
typedef Float32 AudioUnitSampleType;
enum {
	kLinearPCMFormatFlagsSampleFractionShift    = 7,
	kLinearPCMFormatFlagsSampleFractionMask     = (0x3F << kLinearPCMFormatFlagsSampleFractionShift),
};
#endif

//	define the IsMixable format flag for all versions of the system
#if (MAC_OS_X_VERSION_MAX_ALLOWED >= MAC_OS_X_VERSION_10_3)
	enum { kIsNonMixableFlag = kAudioFormatFlagIsNonMixable };
#else
	enum { kIsNonMixableFlag = (1L << 6) };
#endif

//=============================================================================
//	CAStreamBasicDescription
//
//	This is a wrapper class for the AudioStreamBasicDescription struct.
//	It adds a number of convenience routines, but otherwise adds nothing
//	to the footprint of the original struct.
//=============================================================================
class CAStreamBasicDescription : 
	public AudioStreamBasicDescription
{

//	Constants
public:
	static const AudioStreamBasicDescription	sEmpty;

//	Construction/Destruction
public:
	CAStreamBasicDescription() { memset (this, 0, sizeof(AudioStreamBasicDescription)); }
	
	CAStreamBasicDescription(const AudioStreamBasicDescription &desc)
	{
		SetFrom(desc);
	}
	
	CAStreamBasicDescription(		double inSampleRate,		UInt32 inFormatID,
									UInt32 inBytesPerPacket,	UInt32 inFramesPerPacket,
									UInt32 inBytesPerFrame,		UInt32 inChannelsPerFrame,
									UInt32 inBitsPerChannel,	UInt32 inFormatFlags);

//	Assignment
	CAStreamBasicDescription&	operator=(const AudioStreamBasicDescription& v) { SetFrom(v); return *this; }

	void	SetFrom(const AudioStreamBasicDescription &desc)
	{
		memcpy(this, &desc, sizeof(AudioStreamBasicDescription));
	}
	
	// _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
	//
	// interrogation
	
	bool	IsPCM() const { return mFormatID == kAudioFormatLinearPCM; }
	
	bool	PackednessIsSignificant() const
	{
		Assert(IsPCM(), "PackednessIsSignificant only applies for PCM");
		return (SampleWordSize() << 3) != mBitsPerChannel;
	}
	
	bool	AlignmentIsSignificant() const
	{
		return PackednessIsSignificant() || (mBitsPerChannel & 7) != 0;
	}
	
	bool	IsInterleaved() const
	{
		return !IsPCM() || !(mFormatFlags & kAudioFormatFlagIsNonInterleaved);
	}
	
	bool	IsNativeEndian() const
	{
		return (mFormatFlags & kAudioFormatFlagIsBigEndian) == kAudioFormatFlagsNativeEndian;
	}
	
	// for sanity with interleaved/deinterleaved possibilities, never access mChannelsPerFrame, use these:
	UInt32	NumberInterleavedChannels() const	{ return IsInterleaved() ? mChannelsPerFrame : 1; }	
	UInt32	NumberChannelStreams() const		{ return IsInterleaved() ? 1 : mChannelsPerFrame; }
	UInt32	NumberChannels() const				{ return mChannelsPerFrame; }
	UInt32	SampleWordSize() const				{ 
			return (mBytesPerFrame > 0 && NumberInterleavedChannels()) ? mBytesPerFrame / NumberInterleavedChannels() :  0;
	}

	UInt32	FramesToBytes(UInt32 nframes) const	{ return nframes * mBytesPerFrame; }
	UInt32	BytesToFrames(UInt32 nbytes) const	{
		Assert(mBytesPerFrame > 0, "bytesPerFrame must be > 0 in BytesToFrames");
		return nbytes / mBytesPerFrame;
	}
	
	bool	SameChannelsAndInterleaving(const CAStreamBasicDescription &a) const
	{
		return this->NumberChannels() == a.NumberChannels() && this->IsInterleaved() == a.IsInterleaved();
	}
	
	// _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
	//
	//	manipulation
	
	void	SetCanonical(UInt32 nChannels, bool interleaved)
				// note: leaves sample rate untouched
	{
		mFormatID = kAudioFormatLinearPCM;
		int sampleSize = SizeOf32(AudioSampleType);
		mFormatFlags = kAudioFormatFlagsCanonical;
		mBitsPerChannel = 8 * sampleSize;
		mChannelsPerFrame = nChannels;
		mFramesPerPacket = 1;
		if (interleaved)
			mBytesPerPacket = mBytesPerFrame = nChannels * sampleSize;
		else {
			mBytesPerPacket = mBytesPerFrame = sampleSize;
			mFormatFlags |= kAudioFormatFlagIsNonInterleaved;
		}
	}
	
	bool	IsCanonical() const
	{
		if (mFormatID != kAudioFormatLinearPCM) return false;
		UInt32 reqFormatFlags;
		UInt32 flagsMask = (kLinearPCMFormatFlagIsFloat | kLinearPCMFormatFlagIsBigEndian | kLinearPCMFormatFlagIsSignedInteger | kLinearPCMFormatFlagIsPacked | kLinearPCMFormatFlagIsAlignedHigh | kLinearPCMFormatFlagsSampleFractionMask);
		bool interleaved = (mFormatFlags & kAudioFormatFlagIsNonInterleaved) == 0;
		unsigned sampleSize = SizeOf32(AudioSampleType);
		reqFormatFlags = kAudioFormatFlagsCanonical;
		UInt32 reqFrameSize = interleaved ? (mChannelsPerFrame * sampleSize) : sampleSize;

		return ((mFormatFlags & flagsMask) == reqFormatFlags
			&& mBitsPerChannel == 8 * sampleSize
			&& mFramesPerPacket == 1
			&& mBytesPerFrame == reqFrameSize
			&& mBytesPerPacket == reqFrameSize);
	}
	
	void	SetAUCanonical(UInt32 nChannels, bool interleaved)
	{
		mFormatID = kAudioFormatLinearPCM;
#if CA_PREFER_FIXED_POINT
		mFormatFlags = kAudioFormatFlagsCanonical | (kAudioUnitSampleFractionBits << kLinearPCMFormatFlagsSampleFractionShift);
#else
		mFormatFlags = kAudioFormatFlagsCanonical;
#endif
		mChannelsPerFrame = nChannels;
		mFramesPerPacket = 1;
		mBitsPerChannel = 8 * SizeOf32(AudioUnitSampleType);
		if (interleaved)
			mBytesPerPacket = mBytesPerFrame = nChannels * SizeOf32(AudioUnitSampleType);
		else {
			mBytesPerPacket = mBytesPerFrame = SizeOf32(AudioUnitSampleType);
			mFormatFlags |= kAudioFormatFlagIsNonInterleaved;
		}
	}
	
	void	ChangeNumberChannels(UInt32 nChannels, bool interleaved)
				// alter an existing format
	{
		Assert(IsPCM(), "ChangeNumberChannels only works for PCM formats");
		UInt32 wordSize = SampleWordSize();	// get this before changing ANYTHING
		if (wordSize == 0)
			wordSize = (mBitsPerChannel + 7) / 8;
		mChannelsPerFrame = nChannels;
		mFramesPerPacket = 1;
		if (interleaved) {
			mBytesPerPacket = mBytesPerFrame = nChannels * wordSize;
			mFormatFlags &= ~kAudioFormatFlagIsNonInterleaved;
		} else {
			mBytesPerPacket = mBytesPerFrame = wordSize;
			mFormatFlags |= kAudioFormatFlagIsNonInterleaved;
		}
	}
	
	// _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
	//
	//	other
	
	bool	IsEqual(const AudioStreamBasicDescription &other, bool interpretingWildcards=true) const;
	
	void	Print() const {
		Print (stdout);
	}

	void	Print(FILE* file) const {
		PrintFormat (file, "", "AudioStreamBasicDescription:");	
	}

	void	PrintFormat(FILE *f, const char *indent, const char *name) const {
		char buf[256];
		fprintf(f, "%s%s %s\n", indent, name, AsString(buf, sizeof(buf)));
	}
	
	void	PrintFormat2(FILE *f, const char *indent, const char *name) const { // no trailing newline
		char buf[256];
		fprintf(f, "%s%s %s", indent, name, AsString(buf, sizeof(buf)));
	}

	char *	AsString(char *buf, size_t bufsize) const;

	static void Print (const AudioStreamBasicDescription &inDesc) 
	{ 
		CAStreamBasicDescription desc(inDesc);
		desc.Print ();
	}
	
	OSStatus			Save(CFPropertyListRef *outData) const;
		
	OSStatus			Restore(CFPropertyListRef &inData);

//	Operations
	static bool			IsMixable(const AudioStreamBasicDescription& inDescription) { return (inDescription.mFormatID == kAudioFormatLinearPCM) && ((inDescription.mFormatFlags & kIsNonMixableFlag) == 0); }
	static void			NormalizeLinearPCMFormat(AudioStreamBasicDescription& ioDescription);
	static void			ResetFormat(AudioStreamBasicDescription& ioDescription);
	static void			FillOutFormat(AudioStreamBasicDescription& ioDescription, const AudioStreamBasicDescription& inTemplateDescription);
	static void			GetSimpleName(const AudioStreamBasicDescription& inDescription, char* outName, UInt32 inMaxNameLength, bool inAbbreviate);
#if CoreAudio_Debug
	static void			PrintToLog(const AudioStreamBasicDescription& inDesc);
#endif
};

bool		operator<(const AudioStreamBasicDescription& x, const AudioStreamBasicDescription& y);
bool		operator==(const AudioStreamBasicDescription& x, const AudioStreamBasicDescription& y);
#if TARGET_OS_MAC || (TARGET_OS_WIN32 && (_MSC_VER > 600))
inline bool	operator!=(const AudioStreamBasicDescription& x, const AudioStreamBasicDescription& y) { return !(x == y); }
inline bool	operator<=(const AudioStreamBasicDescription& x, const AudioStreamBasicDescription& y) { return (x < y) || (x == y); }
inline bool	operator>=(const AudioStreamBasicDescription& x, const AudioStreamBasicDescription& y) { return !(x < y); }
inline bool	operator>(const AudioStreamBasicDescription& x, const AudioStreamBasicDescription& y) { return !((x < y) || (x == y)); }
#endif

bool SanityCheck(const AudioStreamBasicDescription& x);


#endif // __CAStreamBasicDescription_h__