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#include <pulse/simple.h>
#include <pulse/error.h>
struct AudioPulseAudioSimple : AudioDriver {
AudioPulseAudioSimple& self = *this;
AudioPulseAudioSimple(Audio& super) : AudioDriver(super) {}
~AudioPulseAudioSimple() { terminate(); }
auto create() -> bool override {
super.setBlocking(true);
super.setChannels(2);
super.setFrequency(48000);
return initialize();
}
auto driver() -> string override { return "PulseAudio Simple"; }
auto ready() -> bool override { return _ready; }
auto hasFrequencies() -> vector<u32> override {
return {44100, 48000, 96000};
}
auto setFrequency(u32 frequency) -> bool override { return initialize(); }
auto output(const f64 samples[]) -> void override {
if(!ready()) return;
_buffer[_offset] = (u16)sclamp<16>(samples[0] * 32767.0) << 0;
_buffer[_offset] |= (u16)sclamp<16>(samples[1] * 32767.0) << 16;
if(++_offset >= 64) {
int error;
pa_simple_write(_interface, (const void*)_buffer, _offset * sizeof(u32), &error);
_offset = 0;
}
}
private:
auto initialize() -> bool {
terminate();
pa_sample_spec specification;
specification.format = PA_SAMPLE_S16LE;
specification.channels = 2;
specification.rate = self.frequency;
int error = 0;
_interface = pa_simple_new(
0, //default server
"ruby::pulseAudioSimple", //application name
PA_STREAM_PLAYBACK, //direction
0, //default device
"audio", //stream description
&specification, //sample format
0, //default channel map
0, //default buffering attributes
&error //error code
);
if(!_interface) return false;
_buffer = new u32[64]();
_offset = 0;
return _ready = true;
}
auto terminate() -> void {
_ready = false;
if(_interface) {
int error;
pa_simple_flush(_interface, &error);
pa_simple_free(_interface);
_interface = nullptr;
}
if(_buffer) {
delete[] _buffer;
_buffer = nullptr;
}
}
bool _ready = false;
pa_simple* _interface = nullptr;
u32* _buffer = nullptr;
u32 _offset = 0;
};
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