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/* Copyright: © Copyright 2005 Apple Computer, Inc. All rights reserved.
Disclaimer: IMPORTANT: This Apple software is supplied to you by Apple Computer, Inc.
("Apple") in consideration of your agreement to the following terms, and your
use, installation, modification or redistribution of this Apple software
constitutes acceptance of these terms. If you do not agree with these terms,
please do not use, install, modify or redistribute this Apple software.
In consideration of your agreement to abide by the following terms, and subject
to these terms, Apple grants you a personal, non-exclusive license, under AppleÕs
copyrights in this original Apple software (the "Apple Software"), to use,
reproduce, modify and redistribute the Apple Software, with or without
modifications, in source and/or binary forms; provided that if you redistribute
the Apple Software in its entirety and without modifications, you must retain
this notice and the following text and disclaimers in all such redistributions of
the Apple Software. Neither the name, trademarks, service marks or logos of
Apple Computer, Inc. may be used to endorse or promote products derived from the
Apple Software without specific prior written permission from Apple. Except as
expressly stated in this notice, no other rights or licenses, express or implied,
are granted by Apple herein, including but not limited to any patent rights that
may be infringed by your derivative works or by other works in which the Apple
Software may be incorporated.
The Apple Software is provided by Apple on an "AS IS" basis. APPLE MAKES NO
WARRANTIES, EXPRESS OR IMPLIED, INCLUDING WITHOUT LIMITATION THE IMPLIED
WARRANTIES OF NON-INFRINGEMENT, MERCHANTABILITY AND FITNESS FOR A PARTICULAR
PURPOSE, REGARDING THE APPLE SOFTWARE OR ITS USE AND OPERATION ALONE OR IN
COMBINATION WITH YOUR PRODUCTS.
IN NO EVENT SHALL APPLE BE LIABLE FOR ANY SPECIAL, INDIRECT, INCIDENTAL OR
CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
ARISING IN ANY WAY OUT OF THE USE, REPRODUCTION, MODIFICATION AND/OR DISTRIBUTION
OF THE APPLE SOFTWARE, HOWEVER CAUSED AND WHETHER UNDER THEORY OF CONTRACT, TORT
(INCLUDING NEGLIGENCE), STRICT LIABILITY OR OTHERWISE, EVEN IF APPLE HAS BEEN
ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
/*=============================================================================
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
#undef DEBUG
#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__
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