83 lines
3.0 KiB
C++
83 lines
3.0 KiB
C++
/**********
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This library is free software; you can redistribute it and/or modify it under
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the terms of the GNU Lesser General Public License as published by the
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Free Software Foundation; either version 3 of the License, or (at your
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option) any later version. (See <http://www.gnu.org/copyleft/lesser.html>.)
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This library is distributed in the hope that it will be useful, but WITHOUT
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ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for
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more details.
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You should have received a copy of the GNU Lesser General Public License
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along with this library; if not, write to the Free Software Foundation, Inc.,
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51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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**********/
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// Copyright (c) 1996-2020 Live Networks, Inc. All rights reserved.
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// Windows implementation of a generic audio input device
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// Base class for both library versions:
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// One that uses Windows' built-in software mixer; another that doesn't.
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// C++ header
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#ifndef _WINDOWS_AUDIO_INPUT_DEVICE_COMMON_HH
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#define _WINDOWS_AUDIO_INPUT_DEVICE_COMMON_HH
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#ifndef _AUDIO_INPUT_DEVICE_HH
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#include "AudioInputDevice.hh"
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#endif
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class WindowsAudioInputDevice_common: public AudioInputDevice {
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public:
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static Boolean openWavInPort(int index, unsigned numChannels, unsigned samplingFrequency, unsigned granularityInMS);
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static void waveIn_close();
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static void waveInProc(WAVEHDR* hdr); // Windows audio callback function
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protected:
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WindowsAudioInputDevice_common(UsageEnvironment& env, int inputPortNumber,
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unsigned char bitsPerSample, unsigned char numChannels,
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unsigned samplingFrequency, unsigned granularityInMS);
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// virtual base class
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virtual ~WindowsAudioInputDevice_common();
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Boolean initialSetInputPort(int portIndex);
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protected:
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int fCurPortIndex;
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private:
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// redefined virtual functions:
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virtual void doGetNextFrame();
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virtual void doStopGettingFrames();
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virtual double getAverageLevel() const;
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private:
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static void audioReadyPoller(void* clientData);
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void audioReadyPoller1();
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void onceAudioIsReady();
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// Audio input buffering:
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static Boolean waveIn_open(unsigned uid, WAVEFORMATEX& wfx);
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static void waveIn_reset(); // used to implement both of the above
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static unsigned readFromBuffers(unsigned char* to, unsigned numBytesWanted, struct timeval& creationTime);
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static void releaseHeadBuffer(); // from the input header queue
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private:
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static unsigned _bitsPerSample;
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static HWAVEIN shWaveIn;
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static unsigned blockSize, numBlocks;
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static unsigned char* readData; // buffer for incoming audio data
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static DWORD bytesUsedAtReadHead; // number of bytes that have already been read at head
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static double uSecsPerByte; // used to adjust the time for # bytes consumed since arrival
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static double averageLevel;
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static WAVEHDR *readHdrs, *readHead, *readTail; // input header queue
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static struct timeval* readTimes;
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static HANDLE hAudioReady; // audio ready event
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Boolean fHaveStarted;
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unsigned fTotalPollingDelay; // uSeconds
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};
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#endif
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