| /********** |
| 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 3 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) 1996-2020 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 |