libs/appleutility/CAStreamBasicDescription.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.
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   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
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  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
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  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         CAStreamBasicDescription.h
  40
  41 =============================================================================*/
  42
  43 #ifndef __CAStreamBasicDescription_h__
  44 #define __CAStreamBasicDescription_h__
  45
  46 #if !defined(__COREAUDIO_USE_FLAT_INCLUDES__)
  47         #include <CoreAudio/CoreAudioTypes.h>
  48         #include <CoreFoundation/CoreFoundation.h>
  49 #else
  50         #include "CoreAudioTypes.h"
  51         #include "CoreFoundation.h"
  52 #endif
  53
  54 #include "CADebugMacros.h"
  55 #include <string.h>     // for memset, memcpy
  56 #include <stdio.h>      // for FILE *
  57
  58 #pragma mark    This file needs to compile on more earlier versions of the OS, so please keep that in mind when editing it
  59
  60 //      define the IsMixable format flag for all versions of the system
  61 #if (MAC_OS_X_VERSION_MAX_ALLOWED >= MAC_OS_X_VERSION_10_3)
  62         enum { kIsNonMixableFlag = kAudioFormatFlagIsNonMixable };
  63 #else
  64         enum { kIsNonMixableFlag = (1L << 6) };
  65 #endif
  66
  67 //=============================================================================
  68 //      CAStreamBasicDescription
  69 //
  70 //      This is a wrapper class for the AudioStreamBasicDescription struct.
  71 //      It adds a number of convenience routines, but otherwise adds nothing
  72 //      to the footprint of the original struct.
  73 //=============================================================================
  74 class CAStreamBasicDescription :
  75         public AudioStreamBasicDescription
  76 {
  77
  78 //      Constants
  79 public:
  80         static const AudioStreamBasicDescription        sEmpty;
  81
  82 //      Construction/Destruction
  83 public:
  84         CAStreamBasicDescription() { memset (this, 0, sizeof(AudioStreamBasicDescription)); }
  85
  86         CAStreamBasicDescription(const AudioStreamBasicDescription &desc)
  87         {
  88                 SetFrom(desc);
  89         }
  90
  91         CAStreamBasicDescription(               double inSampleRate,            UInt32 inFormatID,
  92                                                                         UInt32 inBytesPerPacket,        UInt32 inFramesPerPacket,
  93                                                                         UInt32 inBytesPerFrame,         UInt32 inChannelsPerFrame,
  94                                                                         UInt32 inBitsPerChannel,        UInt32 inFormatFlags);
  95
  96 //      Assignment
  97         CAStreamBasicDescription&       operator=(const AudioStreamBasicDescription& v) { SetFrom(v); return *this; }
  98
  99         void    SetFrom(const AudioStreamBasicDescription &desc)
 100         {
 101                 memcpy(this, &desc, sizeof(AudioStreamBasicDescription));
 102         }
 103
 104         // _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
 105         //
 106         // interrogation
 107
 108         bool    IsPCM() const { return mFormatID == kAudioFormatLinearPCM; }
 109
 110         bool    PackednessIsSignificant() const
 111         {
 112                 Assert(IsPCM(), "PackednessIsSignificant only applies for PCM");
 113                 return (SampleWordSize() << 3) != mBitsPerChannel;
 114         }
 115
 116         bool    AlignmentIsSignificant() const
 117         {
 118                 return PackednessIsSignificant() || (mBitsPerChannel & 7) != 0;
 119         }
 120
 121         bool    IsInterleaved() const
 122         {
 123                 return !IsPCM() || !(mFormatFlags & kAudioFormatFlagIsNonInterleaved);
 124         }
 125
 126         // for sanity with interleaved/deinterleaved possibilities, never access mChannelsPerFrame, use these:
 127         UInt32  NumberInterleavedChannels() const       { return IsInterleaved() ? mChannelsPerFrame : 1; }
 128         UInt32  NumberChannelStreams() const            { return IsInterleaved() ? 1 : mChannelsPerFrame; }
 129         UInt32  NumberChannels() const                          { return mChannelsPerFrame; }
 130         UInt32  SampleWordSize() const                          { return (mBytesPerFrame > 0) ? mBytesPerFrame / NumberInterleavedChannels() :  0;}
 131
 132         UInt32  FramesToBytes(UInt32 nframes) const     { return nframes * mBytesPerFrame; }
 133         UInt32  BytesToFrames(UInt32 nbytes) const      {
 134                 Assert(mBytesPerFrame > 0, "bytesPerFrame must be > 0 in BytesToFrames");
 135                 return nbytes / mBytesPerFrame;
 136         }
 137
 138         bool    SameChannelsAndInterleaving(const CAStreamBasicDescription &a) const
 139         {
 140                 return this->NumberChannels() == a.NumberChannels() && this->IsInterleaved() == a.IsInterleaved();
 141         }
 142
 143         // _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
 144         //
 145         //      manipulation
 146
 147         void    SetCanonical(UInt32 nChannels, bool interleaved)
 148                                 // note: leaves sample rate untouched
 149         {
 150                 mFormatID = kAudioFormatLinearPCM;
 151                 mFormatFlags = kAudioFormatFlagsNativeFloatPacked;
 152                 mBitsPerChannel = 32;
 153                 mChannelsPerFrame = nChannels;
 154                 mFramesPerPacket = 1;
 155                 if (interleaved)
 156                         mBytesPerPacket = mBytesPerFrame = nChannels * sizeof(Float32);
 157                 else {
 158                         mBytesPerPacket = mBytesPerFrame = sizeof(Float32);
 159                         mFormatFlags |= kAudioFormatFlagIsNonInterleaved;
 160                 }
 161         }
 162
 163         void    ChangeNumberChannels(UInt32 nChannels, bool interleaved)
 164                                 // alter an existing format
 165         {
 166                 Assert(IsPCM(), "ChangeNumberChannels only works for PCM formats");
 167                 UInt32 wordSize = SampleWordSize();     // get this before changing ANYTHING
 168                 if (wordSize == 0)
 169                         wordSize = (mBitsPerChannel + 7) / 8;
 170                 mChannelsPerFrame = nChannels;
 171                 mFramesPerPacket = 1;
 172                 if (interleaved) {
 173                         mBytesPerPacket = mBytesPerFrame = nChannels * wordSize;
 174                         mFormatFlags &= ~kAudioFormatFlagIsNonInterleaved;
 175                 } else {
 176                         mBytesPerPacket = mBytesPerFrame = wordSize;
 177                         mFormatFlags |= kAudioFormatFlagIsNonInterleaved;
 178                 }
 179         }
 180
 181         // _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
 182         //
 183         //      other
 184
 185         void    Print() const
 186         {
 187                 Print (stdout);
 188         }
 189
 190         void    Print(FILE* file) const
 191         {
 192                 PrintFormat (file, "", "AudioStreamBasicDescription:");
 193         }
 194
 195         void PrintFormat(FILE *f, const char *indent, const char *name) const;
 196
 197         OSStatus                        Save(CFPropertyListRef *outData) const;
 198
 199         OSStatus                        Restore(CFPropertyListRef &inData);
 200
 201 //      Operations
 202         static bool                     IsMixable(const AudioStreamBasicDescription& inDescription) { return (inDescription.mFormatID == kAudioFormatLinearPCM) && ((inDescription.mFormatFlags & kIsNonMixableFlag) == 0); }
 203         static void                     NormalizeLinearPCMFormat(AudioStreamBasicDescription& ioDescription);
 204         static void                     ResetFormat(AudioStreamBasicDescription& ioDescription);
 205         static void                     FillOutFormat(AudioStreamBasicDescription& ioDescription, const AudioStreamBasicDescription& inTemplateDescription);
 206         static void                     GetSimpleName(const AudioStreamBasicDescription& inDescription, char* outName, bool inAbbreviate);
 207 #if CoreAudio_Debug
 208         static void                     PrintToLog(const AudioStreamBasicDescription& inDesc);
 209 #endif
 210 };
 211
 212 bool            operator<(const AudioStreamBasicDescription& x, const AudioStreamBasicDescription& y);
 213 bool            operator==(const AudioStreamBasicDescription& x, const AudioStreamBasicDescription& y);
 214 #if TARGET_OS_MAC || (TARGET_OS_WIN32 && (_MSC_VER > 600))
 215 inline bool     operator!=(const AudioStreamBasicDescription& x, const AudioStreamBasicDescription& y) { return !(x == y); }
 216 inline bool     operator<=(const AudioStreamBasicDescription& x, const AudioStreamBasicDescription& y) { return (x < y) || (x == y); }
 217 inline bool     operator>=(const AudioStreamBasicDescription& x, const AudioStreamBasicDescription& y) { return !(x < y); }
 218 inline bool     operator>(const AudioStreamBasicDescription& x, const AudioStreamBasicDescription& y) { return !((x < y) || (x == y)); }
 219 #endif
 220
 221 bool SanityCheck(const AudioStreamBasicDescription& x);
 222
 223
 224 #endif // __CAStreamBasicDescription_h__