libs/appleutility/CAAudioChannelLayout.h

   1 /*      Copyright:      � Copyright 2005 Apple Computer, Inc. All rights reserved.
   2
   3         Disclaimer:     IMPORTANT:  This Apple software is supplied to you by Apple Computer, Inc.
   4                         ("Apple") in consideration of your agreement to the following terms, and your
   5                         use, installation, modification or redistribution of this Apple software
   6                         constitutes acceptance of these terms.  If you do not agree with these terms,
   7                         please do not use, install, modify or redistribute this Apple software.
   8
   9                         In consideration of your agreement to abide by the following terms, and subject
  10                         to these terms, Apple grants you a personal, non-exclusive license, under Apple�s
  11                         copyrights in this original Apple software (the "Apple Software"), to use,
  12                         reproduce, modify and redistribute the Apple Software, with or without
  13                         modifications, in source and/or binary forms; provided that if you redistribute
  14                         the Apple Software in its entirety and without modifications, you must retain
  15                         this notice and the following text and disclaimers in all such redistributions of
  16                         the Apple Software.  Neither the name, trademarks, service marks or logos of
  17                         Apple Computer, Inc. may be used to endorse or promote products derived from the
  18                         Apple Software without specific prior written permission from Apple.  Except as
  19                         expressly stated in this notice, no other rights or licenses, express or implied,
  20                         are granted by Apple herein, including but not limited to any patent rights that
  21                         may be infringed by your derivative works or by other works in which the Apple
  22                         Software may be incorporated.
  23
  24                         The Apple Software is provided by Apple on an "AS IS" basis.  APPLE MAKES NO
  25                         WARRANTIES, EXPRESS OR IMPLIED, INCLUDING WITHOUT LIMITATION THE IMPLIED
  26                         WARRANTIES OF NON-INFRINGEMENT, MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  27                         PURPOSE, REGARDING THE APPLE SOFTWARE OR ITS USE AND OPERATION ALONE OR IN
  28                         COMBINATION WITH YOUR PRODUCTS.
  29
  30                         IN NO EVENT SHALL APPLE BE LIABLE FOR ANY SPECIAL, INDIRECT, INCIDENTAL OR
  31                         CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
  32                         GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  33                         ARISING IN ANY WAY OUT OF THE USE, REPRODUCTION, MODIFICATION AND/OR DISTRIBUTION
  34                         OF THE APPLE SOFTWARE, HOWEVER CAUSED AND WHETHER UNDER THEORY OF CONTRACT, TORT
  35                         (INCLUDING NEGLIGENCE), STRICT LIABILITY OR OTHERWISE, EVEN IF APPLE HAS BEEN
  36                         ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  37 */
  38 /*=============================================================================
  39         CAAudioChannelLayout.h
  40
  41 =============================================================================*/
  42 #if !defined(__CAAudioChannelLayout_h__)
  43 #define __CAAudioChannelLayout_h__
  44
  45 //=============================================================================
  46 //      Includes
  47 //=============================================================================
  48
  49 //      System Includes
  50 #if !defined(__COREAUDIO_USE_FLAT_INCLUDES__)
  51         #include <CoreAudio/CoreAudioTypes.h>
  52         #include <CoreFoundation/CoreFoundation.h>
  53 #else
  54         #include <CoreAudioTypes.h>
  55         #include <CoreFoundation.h>
  56 #endif
  57 #include <stdio.h>
  58 #include <stdlib.h>
  59 #include <string.h>
  60
  61 #if !HAL_Build
  62         #include "CAReferenceCounted.h"
  63 #endif
  64
  65 //=============================================================================
  66 //      CAAudioChannelLayout
  67 //=============================================================================
  68
  69 bool    operator== (const AudioChannelLayout &x, const AudioChannelLayout &y);
  70
  71 extern "C" void         CAShowAudioChannelLayout (FILE* file, const AudioChannelLayout *layout);
  72
  73 class CAAudioChannelLayout
  74 {
  75 //      static Construction/Destruction
  76 public:
  77         static AudioChannelLayout*      Create(UInt32 inNumberChannelDescriptions);
  78         static void                                     Destroy(AudioChannelLayout* inChannelLayout);
  79         static UInt32                           CalculateByteSize(UInt32 inNumberChannelDescriptions) {
  80                                                                         return offsetof(AudioChannelLayout, mChannelDescriptions) + inNumberChannelDescriptions * sizeof(AudioChannelDescription);
  81                                                                 }
  82         static void                                     SetAllToUnknown(AudioChannelLayout& outChannelLayout, UInt32 inNumberChannelDescriptions);
  83         static UInt32                           NumberChannels(const AudioChannelLayout& inLayout);
  84
  85 #if !HAL_Build
  86 // object methods
  87 public:
  88                                                                 CAAudioChannelLayout ();
  89
  90                                                                 CAAudioChannelLayout (UInt32 inNumberChannels, bool inChooseSurround);
  91                                                                         // if inChooseSurround is false, then symmetrical speaker arrangements
  92                                                                         // are chosen in place of surround layouts if there is a choice
  93                                                                         // This call chooses layouts based on the expected defaults in
  94                                                                         // AudioUnit usage
  95                                                                 CAAudioChannelLayout (AudioChannelLayoutTag inTag);
  96                                                                 CAAudioChannelLayout (const CAAudioChannelLayout &c);
  97                                                                 CAAudioChannelLayout (const AudioChannelLayout* inChannelLayout);
  98                                                                 ~CAAudioChannelLayout();
  99
 100         CAAudioChannelLayout&           operator= (const AudioChannelLayout* inChannelLayout);
 101         CAAudioChannelLayout&           operator= (const CAAudioChannelLayout& c);
 102         bool                                            operator== (const CAAudioChannelLayout &c) const;
 103
 104         void                                            SetWithTag(AudioChannelLayoutTag inTag);
 105
 106         bool                                            IsValid() const { return NumberChannels() > 0; }
 107         UInt32                                          Size() const { return mLayoutHolder ? mLayoutHolder->Size() : 0; }
 108
 109         UInt32                                          NumberChannels() const { return NumberChannels(Layout()); }
 110
 111         AudioChannelLayoutTag           Tag() const { return Layout().mChannelLayoutTag; }
 112         const AudioChannelLayout&       Layout() const { return mLayoutHolder->Layout(); }
 113         operator const AudioChannelLayout *() const { return &Layout(); }
 114
 115         void                                            Print () const { Print (stdout); }
 116         void                                            Print (FILE* file) const;
 117
 118         OSStatus                                        Save (CFPropertyListRef *outData) const;
 119         OSStatus                                        Restore (CFPropertyListRef &inData);
 120
 121 private:
 122         class ACLRefCounter : public CAReferenceCounted {
 123         public:
 124                                 ACLRefCounter (UInt32 inDataSize)
 125                                 {
 126                                         if (inDataSize < offsetof(AudioChannelLayout, mChannelDescriptions))
 127                                                 inDataSize = offsetof(AudioChannelLayout, mChannelDescriptions);
 128
 129                                         mLayout = static_cast<AudioChannelLayout*>(malloc (inDataSize));
 130                                         memset (mLayout, 0, inDataSize);
 131                                         mByteSize = inDataSize;
 132                                 }
 133
 134                 const AudioChannelLayout &      Layout() const { return *mLayout; }
 135
 136                 UInt32                                          Size () const { return mByteSize; }
 137
 138         private:
 139                 AudioChannelLayout      *mLayout;
 140                 UInt32                          mByteSize;
 141
 142                         // only the constructors can change the actual state of the layout
 143                 friend CAAudioChannelLayout::CAAudioChannelLayout (UInt32 inNumberChannels, bool inChooseSurround);
 144                 friend OSStatus CAAudioChannelLayout::Restore (CFPropertyListRef &inData);
 145                 friend CAAudioChannelLayout& CAAudioChannelLayout::operator= (const AudioChannelLayout* inChannelLayout);
 146                 friend void CAAudioChannelLayout::SetWithTag(AudioChannelLayoutTag inTag);
 147
 148                 AudioChannelLayout *    GetLayout() { return mLayout; }
 149                 ~ACLRefCounter() { if (mLayout) { free(mLayout); mLayout = NULL; } }
 150
 151         private:
 152                 ACLRefCounter () : mLayout(NULL) { }
 153                 ACLRefCounter(const ACLRefCounter& c) : mLayout(NULL) { }
 154                 ACLRefCounter& operator=(const ACLRefCounter& c) { return *this; }
 155         };
 156
 157         ACLRefCounter                           *mLayoutHolder;
 158 #endif  //      HAL_Build
 159
 160 };
 161
 162 #endif