diff options
Diffstat (limited to 'libs/appleutility/CoreAudio/PublicUtility/CARingBuffer.cpp')
| -rw-r--r-- | libs/appleutility/CoreAudio/PublicUtility/CARingBuffer.cpp | 64 |
1 files changed, 32 insertions, 32 deletions
diff --git a/libs/appleutility/CoreAudio/PublicUtility/CARingBuffer.cpp b/libs/appleutility/CoreAudio/PublicUtility/CARingBuffer.cpp index c78acd2c2d..8d9584e04a 100644 --- a/libs/appleutility/CoreAudio/PublicUtility/CARingBuffer.cpp +++ b/libs/appleutility/CoreAudio/PublicUtility/CARingBuffer.cpp @@ -2,14 +2,14 @@ File: CARingBuffer.cpp Abstract: CARingBuffer.h 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. - + */ #include "CARingBuffer.h" #include "CABitOperations.h" @@ -69,9 +69,9 @@ CARingBuffer::~CARingBuffer() void CARingBuffer::Allocate(int nChannels, UInt32 bytesPerFrame, UInt32 capacityFrames) { Deallocate(); - + capacityFrames = NextPowerOfTwo(capacityFrames); - + mNumberChannels = nChannels; mBytesPerFrame = bytesPerFrame; mCapacityFrames = capacityFrames; @@ -88,7 +88,7 @@ void CARingBuffer::Allocate(int nChannels, UInt32 bytesPerFrame, UInt32 capacity mBuffers[i] = p; p += mCapacityBytes; } - + for (UInt32 i = 0; i<kGeneralRingTimeBoundsQueueSize; ++i) { mTimeBoundsQueue[i].mStartTime = 0; @@ -157,12 +157,12 @@ CARingBufferError CARingBuffer::Store(const AudioBufferList *abl, UInt32 framesT { if (framesToWrite == 0) return kCARingBufferError_OK; - + if (framesToWrite > mCapacityFrames) return kCARingBufferError_TooMuch; // too big! SampleTime endWrite = startWrite + framesToWrite; - + if (startWrite < EndTime()) { // going backwards, throw everything out SetTimeBounds(startWrite, startWrite); @@ -174,13 +174,13 @@ CARingBufferError CARingBuffer::Store(const AudioBufferList *abl, UInt32 framesT SampleTime newEnd = std::max(newStart, EndTime()); SetTimeBounds(newStart, newEnd); } - + // write the new frames Byte **buffers = mBuffers; int nchannels = mNumberChannels; int offset0, offset1, nbytes; SampleTime curEnd = EndTime(); - + if (startWrite > curEnd) { // we are skipping some samples, so zero the range we are skipping offset0 = FrameOffset(curEnd); @@ -204,10 +204,10 @@ CARingBufferError CARingBuffer::Store(const AudioBufferList *abl, UInt32 framesT StoreABL(buffers, offset0, abl, 0, nbytes); StoreABL(buffers, 0, abl, nbytes, offset1); } - + // now update the end time SetTimeBounds(StartTime(), endWrite); - + return kCARingBufferError_OK; // success } @@ -215,7 +215,7 @@ void CARingBuffer::SetTimeBounds(SampleTime startTime, SampleTime endTime) { UInt32 nextPtr = mTimeBoundsQueuePtr + 1; UInt32 index = nextPtr & kGeneralRingTimeBoundsQueueMask; - + mTimeBoundsQueue[index].mStartTime = startTime; mTimeBoundsQueue[index].mEndTime = endTime; mTimeBoundsQueue[index].mUpdateCounter = nextPtr; @@ -229,12 +229,12 @@ CARingBufferError CARingBuffer::GetTimeBounds(SampleTime &startTime, SampleTime UInt32 curPtr = mTimeBoundsQueuePtr; UInt32 index = curPtr & kGeneralRingTimeBoundsQueueMask; CARingBuffer::TimeBounds* bounds = mTimeBoundsQueue + index; - + startTime = bounds->mStartTime; endTime = bounds->mEndTime; UInt32 newPtr = bounds->mUpdateCounter; - - if (newPtr == curPtr) + + if (newPtr == curPtr) return kCARingBufferError_OK; } return kCARingBufferError_CPUOverload; @@ -243,19 +243,19 @@ CARingBufferError CARingBuffer::GetTimeBounds(SampleTime &startTime, SampleTime CARingBufferError CARingBuffer::ClipTimeBounds(SampleTime& startRead, SampleTime& endRead) { SampleTime startTime, endTime; - + CARingBufferError err = GetTimeBounds(startTime, endTime); if (err) return err; - + if (startRead > endTime || endRead < startTime) { endRead = startRead; return kCARingBufferError_OK; } - + startRead = std::max(startRead, startTime); endRead = std::min(endRead, endTime); endRead = std::max(endRead, startRead); - + return kCARingBufferError_OK; // success } @@ -263,9 +263,9 @@ CARingBufferError CARingBuffer::Fetch(AudioBufferList *abl, UInt32 nFrames, Samp { if (nFrames == 0) return kCARingBufferError_OK; - + startRead = std::max(0LL, startRead); - + SampleTime endRead = startRead + nFrames; SampleTime startRead0 = startRead; @@ -278,25 +278,25 @@ CARingBufferError CARingBuffer::Fetch(AudioBufferList *abl, UInt32 nFrames, Samp ZeroABL(abl, 0, nFrames * mBytesPerFrame); return kCARingBufferError_OK; } - + SInt32 byteSize = (SInt32)((endRead - startRead) * mBytesPerFrame); - - SInt32 destStartByteOffset = std::max((SInt32)0, (SInt32)((startRead - startRead0) * mBytesPerFrame)); - + + SInt32 destStartByteOffset = std::max((SInt32)0, (SInt32)((startRead - startRead0) * mBytesPerFrame)); + if (destStartByteOffset > 0) { ZeroABL(abl, 0, std::min((SInt32)(nFrames * mBytesPerFrame), destStartByteOffset)); } - SInt32 destEndSize = std::max((SInt32)0, (SInt32)(endRead0 - endRead)); + SInt32 destEndSize = std::max((SInt32)0, (SInt32)(endRead0 - endRead)); if (destEndSize > 0) { ZeroABL(abl, destStartByteOffset + byteSize, destEndSize * mBytesPerFrame); } - + Byte **buffers = mBuffers; int offset0 = FrameOffset(startRead); int offset1 = FrameOffset(endRead); int nbytes; - + if (offset0 < offset1) { nbytes = offset1 - offset0; FetchABL(abl, destStartByteOffset, buffers, offset0, nbytes); |