mirror of https://github.com/bsnes-emu/bsnes.git
79 lines
1.9 KiB
C++
79 lines
1.9 KiB
C++
#include <ao/ao.h>
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struct AudioAO : Audio {
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AudioAO() { initialize(); }
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~AudioAO() { terminate(); }
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auto ready() -> bool { return _ready; }
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auto information() -> Information {
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Information information;
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information.devices = {_device};
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information.frequencies = {44100.0, 48000.0, 96000.0};
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information.latencies = {100};
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information.channels = {2};
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return information;
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}
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auto blocking() -> bool { return true; }
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auto channels() -> uint { return 2; }
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auto frequency() -> double { return _frequency; }
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auto latency() -> uint { return 100; }
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auto setFrequency(double frequency) -> bool {
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if(_frequency == frequency) return true;
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_frequency = frequency;
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return initialize();
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}
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auto output(const double samples[]) -> void {
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uint32_t sample = uint16_t(samples[0] * 32768.0) << 0 | uint16_t(samples[1] * 32768.0) << 16;
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ao_play(_interface, (char*)&sample, 4);
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}
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auto initialize() -> bool {
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terminate();
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ao_initialize();
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int driverID = ao_default_driver_id();
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if(driverID < 0) return false;
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ao_sample_format format;
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format.bits = 16;
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format.channels = 2;
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format.rate = (uint)_frequency;
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format.byte_format = AO_FMT_LITTLE;
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format.matrix = nullptr;
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ao_info* information = ao_driver_info(driverID);
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if(!information) return false;
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_device = information->short_name;
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ao_option* options = nullptr;
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if(_device == "alsa") {
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ao_append_option(&options, "buffer_time", "100000"); //100ms latency (default was 500ms)
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}
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_interface = ao_open_live(driverID, &format, options);
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if(!_interface) return false;
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return _ready = true;
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}
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auto terminate() -> void {
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_ready = false;
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if(_interface) {
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ao_close(_interface);
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_interface = nullptr;
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}
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ao_shutdown();
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}
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bool _ready = false;
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string _device = "Default";
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double _frequency = 48000.0;
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ao_device* _interface = nullptr;
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};
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