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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 #include #else #include "CoreAudioTypes.h" #include "CoreFoundation.h" #endif #include "CADebugMacros.h" #include // for memset, memcpy #include // 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__