365 lines
12 KiB
C++
365 lines
12 KiB
C++
/*
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File: ACSimpleCodec.cpp
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Abstract: ACSimpleCodec.h
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Version: 1.1
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Disclaimer: IMPORTANT: This Apple software is supplied to you by Apple
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Inc. ("Apple") in consideration of your agreement to the following
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terms, and your use, installation, modification or redistribution of
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this Apple software constitutes acceptance of these terms. If you do
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not agree with these terms, please do not use, install, modify or
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redistribute this Apple software.
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In consideration of your agreement to abide by the following terms, and
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subject to these terms, Apple grants you a personal, non-exclusive
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license, under Apple's copyrights in this original Apple software (the
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"Apple Software"), to use, reproduce, modify and redistribute the Apple
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Software, with or without modifications, in source and/or binary forms;
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provided that if you redistribute the Apple Software in its entirety and
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without modifications, you must retain this notice and the following
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text and disclaimers in all such redistributions of the Apple Software.
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Neither the name, trademarks, service marks or logos of Apple Inc. may
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be used to endorse or promote products derived from the Apple Software
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without specific prior written permission from Apple. Except as
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expressly stated in this notice, no other rights or licenses, express or
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implied, are granted by Apple herein, including but not limited to any
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patent rights that may be infringed by your derivative works or by other
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works in which the Apple Software may be incorporated.
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The Apple Software is provided by Apple on an "AS IS" basis. APPLE
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MAKES NO WARRANTIES, EXPRESS OR IMPLIED, INCLUDING WITHOUT LIMITATION
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THE IMPLIED WARRANTIES OF NON-INFRINGEMENT, MERCHANTABILITY AND FITNESS
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FOR A PARTICULAR PURPOSE, REGARDING THE APPLE SOFTWARE OR ITS USE AND
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OPERATION ALONE OR IN COMBINATION WITH YOUR PRODUCTS.
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IN NO EVENT SHALL APPLE BE LIABLE FOR ANY SPECIAL, INDIRECT, INCIDENTAL
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OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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INTERRUPTION) ARISING IN ANY WAY OUT OF THE USE, REPRODUCTION,
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MODIFICATION AND/OR DISTRIBUTION OF THE APPLE SOFTWARE, HOWEVER CAUSED
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AND WHETHER UNDER THEORY OF CONTRACT, TORT (INCLUDING NEGLIGENCE),
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STRICT LIABILITY OR OTHERWISE, EVEN IF APPLE HAS BEEN ADVISED OF THE
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POSSIBILITY OF SUCH DAMAGE.
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Copyright (C) 2014 Apple Inc. All Rights Reserved.
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*/
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//=============================================================================
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// Includes
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//=============================================================================
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#include "ACSimpleCodec.h"
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#include <string.h>
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//=============================================================================
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// ACSimpleCodec
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//=============================================================================
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static const UInt32 kBufferPad = 64; // this is used to prevent end from passing start.
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ACSimpleCodec::ACSimpleCodec(UInt32 inInputBufferByteSize, AudioComponentInstance inInstance)
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:
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ACBaseCodec(inInstance),
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mInputBuffer(NULL),
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mInputBufferByteSize(inInputBufferByteSize+kBufferPad),
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mInputBufferStart(0),
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mInputBufferEnd(0)
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{
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}
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ACSimpleCodec::~ACSimpleCodec()
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{
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delete[] mInputBuffer;
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}
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void ACSimpleCodec::Initialize(const AudioStreamBasicDescription* inInputFormat, const AudioStreamBasicDescription* inOutputFormat, const void* inMagicCookie, UInt32 inMagicCookieByteSize)
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{
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ReallocateInputBuffer(mInputBufferByteSize - kBufferPad);
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// By definition CBR has this greater than 0. We must avoid a div by 0 error in AppendInputData()
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// Note this will cause us to fail initialization which is intended
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if (mInputFormat.mBytesPerPacket == 0)
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{
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CODEC_THROW(kAudioCodecUnsupportedFormatError);
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}
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ACBaseCodec::Initialize(inInputFormat, inOutputFormat, inMagicCookie, inMagicCookieByteSize);
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}
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void ACSimpleCodec::Uninitialize()
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{
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// get rid of the buffer
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delete[] mInputBuffer;
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mInputBuffer = NULL;
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// reset the ring buffer state
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mInputBufferStart = 0;
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mInputBufferEnd = 0;
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ACBaseCodec::Uninitialize();
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}
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void ACSimpleCodec::Reset()
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{
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// clear the entire input buffer
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if (mInputBuffer) { // could be called before allocated.
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memset(mInputBuffer, 0, mInputBufferByteSize);
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}
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// reset the ring buffer state
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mInputBufferStart = 0;
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mInputBufferEnd = 0;
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ACBaseCodec::Reset();
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}
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UInt32 ACSimpleCodec::GetInputBufferByteSize() const
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{
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return mInputBufferByteSize - kBufferPad; // minus kBufferPad to prevent end moving past start
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}
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UInt32 ACSimpleCodec::GetUsedInputBufferByteSize() const
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{
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UInt32 theAnswer = 0;
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// this object uses a ring buffer
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if(mInputBufferStart <= mInputBufferEnd)
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{
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// the active region is contiguous
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theAnswer = mInputBufferEnd - mInputBufferStart;
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}
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else
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{
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// the active region wraps around
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theAnswer = (mInputBufferByteSize - mInputBufferStart) + mInputBufferEnd;
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}
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return theAnswer;
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}
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void ACSimpleCodec::AppendInputData(const void* inInputData, UInt32& ioInputDataByteSize, UInt32& ioNumberPackets, const AudioStreamPacketDescription* inPacketDescription)
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{
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// this buffer handling code doesn't care about such things as the packet descriptions
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if(!mIsInitialized) CODEC_THROW(kAudioCodecStateError);
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// this is a ring buffer we're dealing with, so we need to set up a few things
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UInt32 theUsedByteSize = GetUsedInputBufferByteSize();
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UInt32 theAvailableByteSize = GetInputBufferByteSize() - theUsedByteSize;
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UInt32 theMaxAvailableInputBytes = ioInputDataByteSize; // we can't consume more than we get
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const Byte* theInputData = static_cast<const Byte*>(inInputData);
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// >>jamesmcc: added this because ioNumberPackets was not being updated if less was taken than given.
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// THIS ASSUMES CBR!
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UInt32 bytesPerPacketOfInput = mInputFormat.mBytesPerPacket;
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UInt32 theAvailablePacketSize = theAvailableByteSize / bytesPerPacketOfInput;
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UInt32 minPacketSize = ioNumberPackets < theAvailablePacketSize ? ioNumberPackets : theAvailablePacketSize;
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UInt32 minByteSize = minPacketSize * bytesPerPacketOfInput;
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// we can copy only as much data as there is or up to how much space is availiable
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ioNumberPackets = minPacketSize;
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ioInputDataByteSize = minByteSize;
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// ioInputDataByteSize had better be <= to theMaxAvailableInputBytes or we're screwed
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if (ioInputDataByteSize > theMaxAvailableInputBytes)
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{
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CODEC_THROW(kAudioCodecStateError);
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}
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// <<jamesmcc
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// now we have to copy the data taking into account the wrap around and where the start is
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if(mInputBufferEnd + ioInputDataByteSize < mInputBufferByteSize)
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{
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// no wrap around here
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memcpy(mInputBuffer + mInputBufferEnd, theInputData, ioInputDataByteSize);
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// adjust the end point
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mInputBufferEnd += ioInputDataByteSize;
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}
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else
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{
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// the copy will wrap
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// copy the first part
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UInt32 theBeforeWrapByteSize = mInputBufferByteSize - mInputBufferEnd;
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memcpy(mInputBuffer + mInputBufferEnd, theInputData, theBeforeWrapByteSize);
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// and the rest
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UInt32 theAfterWrapByteSize = ioInputDataByteSize - theBeforeWrapByteSize;
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memcpy(mInputBuffer, theInputData + theBeforeWrapByteSize, theAfterWrapByteSize);
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// adjust the end point
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mInputBufferEnd = theAfterWrapByteSize;
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}
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}
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void ACSimpleCodec::ZeroPadInputData(UInt32& ioNumberPackets, const AudioStreamPacketDescription* inPacketDescription)
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{
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// this buffer handling code doesn't care about such things as the packet descriptions
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if(!mIsInitialized) CODEC_THROW(kAudioCodecStateError);
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// this is a ring buffer we're dealing with, so we need to set up a few things
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UInt32 theUsedByteSize = GetUsedInputBufferByteSize();
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UInt32 theAvailableByteSize = GetInputBufferByteSize() - theUsedByteSize;
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// >>jamesmcc: added this because ioNumberPackets was not being updated if less was taken than given.
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// THIS ASSUMES CBR!
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UInt32 bytesPerPacketOfInput = mInputFormat.mBytesPerPacket;
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UInt32 theAvailablePacketSize = theAvailableByteSize / bytesPerPacketOfInput;
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UInt32 minPacketSize = ioNumberPackets < theAvailablePacketSize ? ioNumberPackets : theAvailablePacketSize;
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UInt32 minByteSize = minPacketSize * bytesPerPacketOfInput;
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// we can copy only as much data as there is or up to how much space is availiable
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ioNumberPackets = minPacketSize;
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// <<jamesmcc
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// now we have to copy the data taking into account the wrap around and where the start is
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if(mInputBufferEnd + minByteSize < mInputBufferByteSize)
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{
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// no wrap around here
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memset(mInputBuffer + mInputBufferEnd, 0, minByteSize);
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// adjust the end point
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mInputBufferEnd += minByteSize;
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}
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else
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{
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// the copy will wrap
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// copy the first part
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UInt32 theBeforeWrapByteSize = mInputBufferByteSize - mInputBufferEnd;
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memset(mInputBuffer + mInputBufferEnd, 0, theBeforeWrapByteSize);
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// and the rest
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UInt32 theAfterWrapByteSize = minByteSize - theBeforeWrapByteSize;
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memset(mInputBuffer, 0, theAfterWrapByteSize);
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// adjust the end point
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mInputBufferEnd = theAfterWrapByteSize;
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}
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}
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void ACSimpleCodec::ConsumeInputData(UInt32 inConsumedByteSize)
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{
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// this is a convenience routine to make maintaining the ring buffer state easy
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UInt32 theContiguousRange = GetInputBufferContiguousByteSize();
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if(inConsumedByteSize > GetUsedInputBufferByteSize()) CODEC_THROW(kAudioCodecUnspecifiedError);
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if(inConsumedByteSize <= theContiguousRange)
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{
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// the region to consume doesn't wrap
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// figure out how much to consume
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inConsumedByteSize = (theContiguousRange < inConsumedByteSize) ? theContiguousRange : inConsumedByteSize;
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// clear the consumed bits
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memset(mInputBuffer + mInputBufferStart, 0, inConsumedByteSize);
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// adjust the start
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mInputBufferStart += inConsumedByteSize;
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}
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else
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{
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// the region to consume will wrap
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// clear the bits to the end of the buffer
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memset(mInputBuffer + mInputBufferStart, 0, theContiguousRange);
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// now clear the bits left from the start
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memset(mInputBuffer, 0, inConsumedByteSize - theContiguousRange);
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// adjust the start
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mInputBufferStart = inConsumedByteSize - theContiguousRange;
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}
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}
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Byte* ACSimpleCodec::GetBytes(UInt32& ioNumberBytes) const
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{
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// if a client's algorithm has to have contiguous data and mInputBuffer wraps, then someone has to make a copy.
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// I can do it more efficiently than the client.
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if(!mIsInitialized) CODEC_THROW(kAudioCodecStateError);
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UInt32 theUsedByteSize = GetUsedInputBufferByteSize();
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//UInt32 theAvailableByteSize = GetInputBufferByteSize() - theUsedByteSize;
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if (ioNumberBytes > theUsedByteSize) ioNumberBytes = theUsedByteSize;
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SInt32 leftOver = mInputBufferStart + ioNumberBytes - mInputBufferByteSize;
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if(leftOver > 0)
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{
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// need to copy beginning of buffer to the end.
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// We cleverly over allocated our buffer space to make this possible.
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memmove(mInputBuffer + mInputBufferByteSize, mInputBuffer, leftOver);
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}
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return GetInputBufferStart();
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}
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void ACSimpleCodec::ReallocateInputBuffer(UInt32 inInputBufferByteSize)
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{
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mInputBufferByteSize = inInputBufferByteSize + kBufferPad;
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// toss the old buffer
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delete[] mInputBuffer;
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mInputBuffer = NULL;
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// allocate the new one
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// allocate extra in order to allow making contiguous data.
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UInt32 allocSize = 2*inInputBufferByteSize + kBufferPad;
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mInputBuffer = new Byte[allocSize];
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memset(mInputBuffer, 0, allocSize);
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// reset the ring buffer state
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mInputBufferStart = 0;
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mInputBufferEnd = 0;
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}
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void ACSimpleCodec::GetPropertyInfo(AudioCodecPropertyID inPropertyID, UInt32& outPropertyDataSize, Boolean& outWritable)
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{
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switch(inPropertyID)
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{
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case kAudioCodecPropertyInputBufferSize:
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outPropertyDataSize = SizeOf32(UInt32);
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outWritable = true;
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break;
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default:
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ACBaseCodec::GetPropertyInfo(inPropertyID, outPropertyDataSize, outWritable);
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break;
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}
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}
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void ACSimpleCodec::SetProperty(AudioCodecPropertyID inPropertyID, UInt32 inPropertyDataSize, const void* inPropertyData)
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{
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switch(inPropertyID)
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{
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case kAudioCodecPropertyInputBufferSize:
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if(inPropertyDataSize == sizeof(UInt32))
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{
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ReallocateInputBuffer(*reinterpret_cast<const UInt32*>(inPropertyData));
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}
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else
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{
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CODEC_THROW(kAudioCodecBadPropertySizeError);
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}
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break;
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default:
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ACBaseCodec::SetProperty(inPropertyID, inPropertyDataSize, inPropertyData);
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break;
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}
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}
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