108 lines
2.6 KiB
C++
Executable File
108 lines
2.6 KiB
C++
Executable File
#ifndef PULSEAUDIO_H
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#define PULSEAUDIO_H
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#include <pulse/pulseaudio.h>
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#include <pulse/simple.h>
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#include <iostream>
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#include "../exception.h"
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#include <thread>
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/**
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* receive events from pulse audio
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*/
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class PulseAudio {
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private:
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pa_sample_spec sampleSpec;
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pa_simple* simple;
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std::thread thread;
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public:
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/** ctor */
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PulseAudio(const std::string& devName) {
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sampleSpec.format = PA_SAMPLE_S16LE;
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sampleSpec.rate = 44100;
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sampleSpec.channels = 1;
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// pactl list | grep "\.monitor"
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const char* server = nullptr;
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const char* clientName = "beat detection";
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const char* streamName = "recording beats";
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const char* dev = devName.c_str(); //nullptr;
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//const char* dev = "alsa_output.usb-0d8c_USB_Sound_Device-00-Device.analog-surround-51.monitor";
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// connect
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int error;
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simple = pa_simple_new(server, clientName, PA_STREAM_RECORD, dev, streamName, &sampleSpec, NULL, NULL, &error);
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if (!simple) {throw Exception("error while connecting to PulseAudio");}
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std::cout << simple << std::endl;
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}
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void start() {
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std::cout << "starting read loop" << std::endl;
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thread = std::thread(&PulseAudio::readLoop, this);
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}
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void join() {
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thread.join();
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}
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void read(int16_t* dst, int samples) {
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const int bytes = samples * sizeof(int16_t);
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int error;
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const int res = pa_simple_read(simple, dst, bytes, &error);
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if (res < 0) {throw Exception("error while reading data");}
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}
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private:
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void readLoop() {
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std::cout << "hello from read loop" << std::endl;
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int16_t buffer[1024];
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int error = 0;
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while(true) {
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const int res = pa_simple_read(simple, buffer, sizeof(buffer), &error);
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std::cout << res << ", " << error << std::endl;
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if (res < 0) {throw Exception("error while reading data");}
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std::cout << buffer[0] << "," << buffer[1] << "," << buffer[2] << "," << buffer[3] << std::endl;
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}
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}
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/*
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int i = -1;
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while (!exit_program) {
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i = (i+1) % BUFNUMBER;
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pthread_mutex_lock(&(buffer[i].write));
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// Record data and save it to the buffer
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if (pa_simple_read(s, buffer[i].buf, sizeof(buffer[i].buf), &error) < 0) {
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fprintf(stderr, __FILE__": pa_simple_read() failed: %s\n", pa_strerror(error));
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pa_simple_free(s);
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exit(EXIT_FAILURE);
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}
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// unlock the reading mutex
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pthread_mutex_unlock(&(buffer[i].read)); // open up for reading
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}
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*/
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};
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#endif // PULSEAUDIO_H
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