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/**********
This library is free software; you can redistribute it and/or modify it under
the terms of the GNU Lesser General Public License as published by the
Free Software Foundation; either version 2.1 of the License, or (at your
option) any later version. (See <http://www.gnu.org/copyleft/lesser.html>.)
This library is distributed in the hope that it will be useful, but WITHOUT
ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for
more details.
You should have received a copy of the GNU Lesser General Public License
along with this library; if not, write to the Free Software Foundation, Inc.,
51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
**********/
// Copyright (c) 1996-2012 Live Networks, Inc. All rights reserved.
// Windows implementation of a generic audio input device
// Base class for both library versions:
// One that uses Windows' built-in software mixer; another that doesn't.
// C++ header
#ifndef _WINDOWS_AUDIO_INPUT_DEVICE_COMMON_HH
#define _WINDOWS_AUDIO_INPUT_DEVICE_COMMON_HH
#ifndef _AUDIO_INPUT_DEVICE_HH
#include "AudioInputDevice.hh"
#endif
class WindowsAudioInputDevice_common: public AudioInputDevice {
public:
static Boolean openWavInPort(int index, unsigned numChannels, unsigned samplingFrequency, unsigned granularityInMS);
static void waveIn_close();
static void waveInProc(WAVEHDR* hdr); // Windows audio callback function
protected:
WindowsAudioInputDevice_common(UsageEnvironment& env, int inputPortNumber,
unsigned char bitsPerSample, unsigned char numChannels,
unsigned samplingFrequency, unsigned granularityInMS);
// virtual base class
virtual ~WindowsAudioInputDevice_common();
Boolean initialSetInputPort(int portIndex);
protected:
int fCurPortIndex;
private:
// redefined virtual functions:
virtual void doGetNextFrame();
virtual void doStopGettingFrames();
virtual double getAverageLevel() const;
private:
static void audioReadyPoller(void* clientData);
void audioReadyPoller1();
void onceAudioIsReady();
// Audio input buffering:
static Boolean waveIn_open(unsigned uid, WAVEFORMATEX& wfx);
static void waveIn_reset(); // used to implement both of the above
static unsigned readFromBuffers(unsigned char* to, unsigned numBytesWanted, struct timeval& creationTime);
static void releaseHeadBuffer(); // from the input header queue
private:
static unsigned _bitsPerSample;
static HWAVEIN shWaveIn;
static unsigned blockSize, numBlocks;
static unsigned char* readData; // buffer for incoming audio data
static DWORD bytesUsedAtReadHead; // number of bytes that have already been read at head
static double uSecsPerByte; // used to adjust the time for # bytes consumed since arrival
static double averageLevel;
static WAVEHDR *readHdrs, *readHead, *readTail; // input header queue
static struct timeval* readTimes;
static HANDLE hAudioReady; // audio ready event
Boolean fHaveStarted;
unsigned fTotalPollingDelay; // uSeconds
};
#endif
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