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__