mirror of https://github.com/bsnes-emu/bsnes.git
78 lines
1.8 KiB
C++
78 lines
1.8 KiB
C++
#include <ao/ao.h>
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struct AudioAO : AudioDriver {
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AudioAO& self = *this;
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AudioAO(Audio& super) : AudioDriver(super) {}
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~AudioAO() { terminate(); }
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auto create() -> bool override {
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super.setChannels(2);
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super.setFrequency(48000);
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return initialize();
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}
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auto driver() -> string override { return "libao"; }
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auto ready() -> bool override { return _ready; }
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auto hasChannels() -> vector<uint> override {
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return {2};
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}
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auto hasFrequencies() -> vector<uint> override {
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return {44100, 48000, 96000};
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}
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auto setFrequency(uint frequency) -> bool override { return initialize(); }
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auto output(const double samples[]) -> void override {
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uint32_t sample = 0;
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sample |= (uint16_t)sclamp<16>(samples[0] * 32767.0) << 0;
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sample |= (uint16_t)sclamp<16>(samples[1] * 32767.0) << 16;
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ao_play(_interface, (char*)&sample, 4);
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}
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private:
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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 = self.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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string 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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ao_device* _interface = nullptr;
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};
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