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#include <pulse/simple.h>
#include <pulse/error.h>
struct AudioPulseAudioSimple : Audio {
~AudioPulseAudioSimple() { term(); }
struct {
pa_simple* handle = nullptr;
pa_sample_spec spec;
} device;
struct {
uint32_t* data = nullptr;
unsigned offset = 0;
} buffer;
struct {
unsigned frequency = 22050;
} settings;
auto cap(const string& name) -> bool {
if(name == Audio::Frequency) return true;
return false;
}
auto get(const string& name) -> any {
if(name == Audio::Frequency) return settings.frequency;
return {};
}
auto set(const string& name, const any& value) -> bool {
if(name == Audio::Frequency && value.is<unsigned>()) {
settings.frequency = value.get<unsigned>();
if(device.handle) init();
return true;
}
return false;
}
auto sample(uint16_t left, uint16_t right) -> void {
if(!device.handle) return;
buffer.data[buffer.offset++] = left + (right << 16);
if(buffer.offset >= 64) {
int error;
pa_simple_write(device.handle, (const void*)buffer.data, buffer.offset * sizeof(uint32_t), &error);
buffer.offset = 0;
}
}
auto clear() -> void {
}
auto init() -> bool {
device.spec.format = PA_SAMPLE_S16LE;
device.spec.channels = 2;
device.spec.rate = settings.frequency;
int error = 0;
device.handle = pa_simple_new(
0, //default server
"ruby::pulseaudiosimple", //application name
PA_STREAM_PLAYBACK, //direction
0, //default device
"audio", //stream description
&device.spec, //sample format
0, //default channel map
0, //default buffering attributes
&error //error code
);
if(!device.handle) {
fprintf(stderr, "ruby::pulseaudiosimple failed to initialize - %s\n", pa_strerror(error));
return false;
}
buffer.data = new uint32_t[64];
buffer.offset = 0;
return true;
}
auto term() -> void {
if(device.handle) {
int error;
pa_simple_flush(device.handle, &error);
pa_simple_free(device.handle);
device.handle = nullptr;
}
if(buffer.data) {
delete[] buffer.data;
buffer.data = nullptr;
}
}
};
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