其實，本篇博客主要是介紹1下RtAudio，只是在qt中使用罷了！
甚么是RtAudio？
RtAudio provides a common API for realtime audio input/output across Linux (native ALSA, Jack, and OSS), Macintosh OS X (CoreAudio and Jack), and Windows(DirectSound, ASIO and WASAPI) operating systems.
官方地址：
http://www.music.mcgill.ca/~gary/rtaudio/
github地址：
https://github.com/thestk/rtaudio
下載rtaudio：
最新版本 (22 February 2016): Version 4.1.2
官方文檔利用例子：
#include "RtAudio.h"
#include <iostream>
#include <cstdlib>
#include <cstring>
int record( void *outputBuffer, void *inputBuffer, unsigned int nBufferFrames,
double streamTime, RtAudioStreamStatus status, void *userData )
{
if ( status )
std::cout << "Stream overflow detected!" << std::endl;
// Do something with the data in the "inputBuffer" buffer.
return 0;
}
int main()
{
RtAudio adc;
if ( adc.getDeviceCount() < 1 ) {
std::cout << "\nNo audio devices found!\n";
exit( 0 );
}
RtAudio::StreamParameters parameters;
parameters.deviceId = adc.getDefaultInputDevice();
parameters.nChannels = 2;
parameters.firstChannel = 0;
unsigned int sampleRate = 44100;
unsigned int bufferFrames = 256; // 256 sample frames
try {
adc.openStream( NULL, ¶meters, RTAUDIO_SINT16,
sampleRate, &bufferFrames, &record );
adc.startStream();
}
catch ( RtAudioError& e ) {
e.printMessage();
exit( 0 );
}
char input;
std::cout << "\nRecording ... press <enter> to quit.\n";
std::cin.get( input );
try {
// Stop the stream
adc.stopStream();
}
catch (RtAudioError& e) {
e.printMessage();
}
if ( adc.isStreamOpen() ) adc.closeStream();
return 0;
}Qt中的利用
功能：
1左聲道
2右聲道
3雙聲道
封裝1個類，叫ThreadRecord，在多線程中使用RrAudio，固然是繼承QThread：
class ThreadRecord :public QThread
{
public:
ThreadRecord();
static int record(void *outputBuffer, void *inputBuffer, unsigned int nBufferFrames, double streamTime, RtAudioStreamStatus status, void *userData);
bool flag;
int type;//通過type進行判斷是使用左聲道、右聲道、雙聲道
protected:
void run();
private:
RtAudio adc;
RtAudio::StreamParameters input;
RtAudio::StreamParameters output;
};實現threadrecord.cc:
int ThreadRecord::record(void *outputBuffer, void *inputBuffer, unsigned int nBufferFrames, double streamTime, RtAudioStreamStatus status, void *userData)
{
if (status)
cout << "Stream overflow detected!" << std::endl;
short* output = static_cast<short*>(outputBuffer);
short* input = static_cast<short*>(inputBuffer);
short n = nBufferFrames;
int i = *(static_cast<int*>(userData));
if(i == 2) {
for (i = 0; i < nBufferFrames; i += 1) {
output[i] = input[i];
}
} else {
for (; i < nBufferFrames; i += 2) {
output[i] = input[i];
}
}
return 0;
}
void ThreadRecord::run()
{
//adc為成員變量：RtAudio adc_;
// adc_.getDeviceCount()取得音頻裝備數量
for(int i = 0 ; i < adc_.getDeviceCount() ; i++)
{
qDebug()<< i << adc_.getDeviceInfo(i).name.c_str();
}
if (adc_.getDeviceCount() < 1) {
cout << "\nNo audio devices found!\n";
exit( 0 );
}
//adc_.getDefaultInputDevice();取得默許輸入裝備
input.deviceId = adc_.getDefaultInputDevice();
input.nChannels = 2;
input.firstChannel = 0;
output.deviceId = adc_.getDefaultOutputDevice();
output.nChannels = 2;
output.firstChannel = 0;
unsigned int sampleRate = 44100;
unsigned int bufferFrames = 256;
try {
adc_.openStream(&output, &input, RTAUDIO_SINT16, sampleRate,
&bufferFrames, &record, static_cast<void*>(&type),
NULL, &ErrorCallback);
adc_.startStream();
}
catch (RtAudioError& e) {
e.printMessage();
exit(0);
}
while (flag);
try {
adc_.stopStream();
}
catch (RtAudioError& e) {
e.printMessage();
}
if (adc_.isStreamOpen())
adc_.closeStream();
}使用，為了節省篇幅，只寫1個函數：
type=0 左聲道
type=1 右聲道
type=2 雙聲道
void Recording::onLeftSoundButtonClicked()
{
if (thread_record.isRunning())
thread_record.exit(0);
thread_record.flag = true;
thread_record.type = 0;
thread_record.start();
}
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