mirror of https://github.com/bsnes-emu/bsnes.git
73 lines
1.8 KiB
C++
73 lines
1.8 KiB
C++
#include <ao/ao.h>
|
|
|
|
struct AudioAO : Audio {
|
|
AudioAO() { initialize(); }
|
|
~AudioAO() { terminate(); }
|
|
|
|
auto driver() -> string override { return "libao"; }
|
|
auto ready() -> bool override { return _ready; }
|
|
|
|
auto hasFrequencies() -> bool override { return true; }
|
|
|
|
auto availableFrequencies() -> vector<double> override {
|
|
return {44100.0, 48000.0, 96000.0};
|
|
}
|
|
|
|
auto setFrequency(double frequency) -> bool override {
|
|
if(frequency == Audio::frequency()) return true;
|
|
if(!Audio::setFrequency(frequency)) return false;
|
|
return initialize();
|
|
}
|
|
|
|
auto output(const double samples[]) -> void override {
|
|
uint32_t sample = 0;
|
|
sample |= (uint16_t)sclamp<16>(samples[0] * 32767.0) << 0;
|
|
sample |= (uint16_t)sclamp<16>(samples[1] * 32767.0) << 16;
|
|
ao_play(_interface, (char*)&sample, 4);
|
|
}
|
|
|
|
private:
|
|
auto initialize() -> bool {
|
|
terminate();
|
|
|
|
ao_initialize();
|
|
|
|
int driverID = ao_default_driver_id();
|
|
if(driverID < 0) return false;
|
|
|
|
ao_sample_format format;
|
|
format.bits = 16;
|
|
format.channels = 2;
|
|
format.rate = (uint)_frequency;
|
|
format.byte_format = AO_FMT_LITTLE;
|
|
format.matrix = nullptr;
|
|
|
|
ao_info* information = ao_driver_info(driverID);
|
|
if(!information) return false;
|
|
string device = information->short_name;
|
|
|
|
ao_option* options = nullptr;
|
|
if(device == "alsa") {
|
|
ao_append_option(&options, "buffer_time", "100000"); //100ms latency (default was 500ms)
|
|
}
|
|
|
|
_interface = ao_open_live(driverID, &format, options);
|
|
if(!_interface) return false;
|
|
|
|
return _ready = true;
|
|
}
|
|
|
|
auto terminate() -> void {
|
|
_ready = false;
|
|
if(_interface) {
|
|
ao_close(_interface);
|
|
_interface = nullptr;
|
|
}
|
|
ao_shutdown();
|
|
}
|
|
|
|
bool _ready = false;
|
|
|
|
ao_device* _interface = nullptr;
|
|
};
|