diff options
Diffstat (limited to 'libs/appleutility/CoreAudio/PublicUtility/CARingBuffer.h')
| -rw-r--r-- | libs/appleutility/CoreAudio/PublicUtility/CARingBuffer.h | 36 |
1 files changed, 18 insertions, 18 deletions
diff --git a/libs/appleutility/CoreAudio/PublicUtility/CARingBuffer.h b/libs/appleutility/CoreAudio/PublicUtility/CARingBuffer.h index 9569e9a2a8..4331194e22 100644 --- a/libs/appleutility/CoreAudio/PublicUtility/CARingBuffer.h +++ b/libs/appleutility/CoreAudio/PublicUtility/CARingBuffer.h @@ -2,14 +2,14 @@ File: CARingBuffer.h Abstract: Part of CoreAudio Utility Classes Version: 1.1 - + Disclaimer: IMPORTANT: This Apple software is supplied to you by Apple 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 Apple's copyrights in this original Apple software (the @@ -25,13 +25,13 @@ 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 @@ -40,9 +40,9 @@ 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. - + Copyright (C) 2014 Apple Inc. All Rights Reserved. - + */ #if !defined(__COREAUDIO_USE_FLAT_INCLUDES__) #include <CoreAudio/CoreAudioTypes.h> @@ -71,37 +71,37 @@ public: CARingBuffer(); ~CARingBuffer(); - + void Allocate(int nChannels, UInt32 bytesPerFrame, UInt32 capacityFrames); // capacityFrames will be rounded up to a power of 2 void Deallocate(); - + CARingBufferError Store(const AudioBufferList *abl, UInt32 nFrames, SampleTime frameNumber); // Copy nFrames of data into the ring buffer at the specified sample time. // The sample time should normally increase sequentially, though gaps // are filled with zeroes. A sufficiently large gap effectively empties - // the buffer before storing the new data. - + // the buffer before storing the new data. + // If frameNumber is less than the previous frame number, the behavior is undefined. - + // Return false for failure (buffer not large enough). - + CARingBufferError Fetch(AudioBufferList *abl, UInt32 nFrames, SampleTime frameNumber); // will alter mNumDataBytes of the buffers - + CARingBufferError GetTimeBounds(SampleTime &startTime, SampleTime &endTime); - + protected: int FrameOffset(SampleTime frameNumber) { return (frameNumber & mCapacityFramesMask) * mBytesPerFrame; } CARingBufferError ClipTimeBounds(SampleTime& startRead, SampleTime& endRead); - + // these should only be called from Store. SampleTime StartTime() const { return mTimeBoundsQueue[mTimeBoundsQueuePtr & kGeneralRingTimeBoundsQueueMask].mStartTime; } SampleTime EndTime() const { return mTimeBoundsQueue[mTimeBoundsQueuePtr & kGeneralRingTimeBoundsQueueMask].mEndTime; } void SetTimeBounds(SampleTime startTime, SampleTime endTime); - + protected: Byte ** mBuffers; // allocated in one chunk of memory int mNumberChannels; @@ -109,14 +109,14 @@ protected: UInt32 mCapacityFrames; // per channel, must be a power of 2 UInt32 mCapacityFramesMask; UInt32 mCapacityBytes; // per channel - + // range of valid sample time in the buffer typedef struct { volatile SampleTime mStartTime; volatile SampleTime mEndTime; volatile UInt32 mUpdateCounter; } TimeBounds; - + CARingBuffer::TimeBounds mTimeBoundsQueue[kGeneralRingTimeBoundsQueueSize]; UInt32 mTimeBoundsQueuePtr; }; |