root/branches/perian-1.1/CAPublicUtility/CAStreamBasicDescription.h

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/*=============================================================================
        CAStreamBasicDescription.h
        
=============================================================================*/

#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

//      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);
        }
        
        // 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) ? 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;
                mFormatFlags = kAudioFormatFlagsNativeFloatPacked;
                mBitsPerChannel = 32;
                mChannelsPerFrame = nChannels;
                mFramesPerPacket = 1;
                if (interleaved)
                        mBytesPerPacket = mBytesPerFrame = nChannels * sizeof(Float32);
                else {
                        mBytesPerPacket = mBytesPerFrame = sizeof(Float32);
                        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
        
        void    Print() const
        {
                Print (stdout);
        }

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

        void PrintFormat(FILE *f, const char *indent, const char *name) const;

        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, 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__