156 lines
5.8 KiB
C++
156 lines
5.8 KiB
C++
/*
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File: AUInputFormatConverter.h
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Abstract: Part of CoreAudio Utility Classes
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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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#ifndef __AUInputFormatConverter_h__
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#define __AUInputFormatConverter_h__
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#include "FormatConverterClient.h"
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#include "AUTimestampGenerator.h"
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// ____________________________________________________________________________
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// AUInputFormatConverter
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//
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// Subclass of FormatConverterClient that applies a format conversion
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// to an input of an AudioUnit.
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/*! @class AUInputFormatConverter */
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class AUInputFormatConverter : public FormatConverterClient {
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public:
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/*! @ctor AUInputFormatConverter */
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AUInputFormatConverter(AUBase *hostAU, int inputBus) :
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mHost(hostAU),
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mHostBus(inputBus),
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mPreviousSilentFrames(0x1000)
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{
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#if DEBUG
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mTimestampGenerator.mVerbosity = 0;
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strcpy(mTimestampGenerator.mDebugName, "AUConverter");
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#endif
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}
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// need to subsequently call Initialize, with the desired formats
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/*! @dtor ~AUInputFormatConverter */
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~AUInputFormatConverter()
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{
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}
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virtual OSStatus Initialize(const AudioStreamBasicDescription &src, const AudioStreamBasicDescription &dest)
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{
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OSStatus err = FormatConverterClient::Initialize(src, dest);
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if (err) return err;
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mIsPCMToPCM = (src.mFormatID == kAudioFormatLinearPCM) && (dest.mFormatID == kAudioFormatLinearPCM);
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mHasSRC = (fnonzero(src.mSampleRate) && fnonzero(dest.mSampleRate) && fnotequal(src.mSampleRate, dest.mSampleRate));
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return ca_noErr;
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}
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virtual OSStatus Reset()
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{
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mPreviousSilentFrames = 0x1000;
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mTimestampGenerator.Reset();
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return FormatConverterClient::Reset();
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}
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void SetStartInputTimeAtZero(bool b)
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{
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mTimestampGenerator.SetStartInputAtZero(b);
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}
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/*! @method FillComplexBuffer */
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OSStatus AUFillComplexBuffer(const AudioTimeStamp & inTimeStamp,
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UInt32 & ioOutputDataPacketSize,
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AudioBufferList & outOutputData,
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AudioStreamPacketDescription* outPacketDescription,
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bool& outSilence)
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{
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mTimestampGenerator.AddOutputTime(inTimeStamp, ioOutputDataPacketSize, mOutputFormat.mSampleRate);
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mSilentOutput = true;
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OSStatus err = FillComplexBuffer(ioOutputDataPacketSize, outOutputData, outPacketDescription);
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if (mSilentOutput) {
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if (!mIsPCMToPCM || (mHasSRC && mPreviousSilentFrames < 32))
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mSilentOutput = false;
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mPreviousSilentFrames += ioOutputDataPacketSize;
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} else
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mPreviousSilentFrames = 0;
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outSilence = mSilentOutput;
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return err;
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}
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/*! @method FormatConverterInputProc */
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virtual OSStatus FormatConverterInputProc(
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UInt32 & ioNumberDataPackets,
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AudioBufferList & ioData,
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AudioStreamPacketDescription** outDataPacketDescription)
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{
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OSStatus err = ca_noErr;
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AudioUnitRenderActionFlags actionFlags = 0;
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AUInputElement *input = mHost->GetInput(mHostBus);
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*ioNumberDataPackets = std::min(*ioNumberDataPackets, This->mHost->GetMaxFramesPerSlice());
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const AudioTimeStamp &inputTime = mTimestampGenerator.GenerateInputTime(ioNumberDataPackets, mInputFormat.mSampleRate);
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err = input->PullInput(actionFlags, inputTime, mHostBus, ioNumberDataPackets);
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if (!err) {
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input->CopyBufferListTo(ioData);
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if (!(actionFlags & kAudioUnitRenderAction_OutputIsSilence))
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mSilentOutput = false;
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}
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return err;
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}
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protected:
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/*! @var mHost */
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AUBase * mHost;
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/*! @var mHostBus */
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int mHostBus;
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AUTimestampGenerator mTimestampGenerator;
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bool mIsPCMToPCM;
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bool mHasSRC;
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bool mSilentOutput;
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UInt32 mPreviousSilentFrames;
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};
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#endif // __AUInputFormatConverter_h__
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