73 lines
1.7 KiB
C++
73 lines
1.7 KiB
C++
#include <ao/ao.h>
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struct AudioAO : Audio {
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~AudioAO() { term(); }
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int driver_id;
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ao_sample_format driver_format;
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ao_device* audio_device = nullptr;
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struct {
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unsigned frequency = 22050;
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} settings;
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auto cap(const string& name) -> bool {
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if(name == Audio::Frequency) return true;
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return false;
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}
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auto get(const string& name) -> any {
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if(name == Audio::Frequency) return settings.frequency;
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return {};
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}
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auto set(const string& name, const any& value) -> bool {
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if(name == Audio::Frequency && value.is<unsigned>()) {
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settings.frequency = value.get<unsigned>();
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if(audio_device) init();
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return true;
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}
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return false;
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}
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auto sample(uint16_t l_sample, uint16_t r_sample) -> void {
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uint32_t samp = (l_sample << 0) + (r_sample << 16);
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ao_play(audio_device, (char*)&samp, 4); //This may need to be byte swapped for Big Endian
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}
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auto clear() -> void {
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}
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auto init() -> bool {
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ao_initialize();
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driver_id = ao_default_driver_id(); //ao_driver_id((const char*)driver)
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if(driver_id < 0) return false;
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driver_format.bits = 16;
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driver_format.channels = 2;
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driver_format.rate = settings.frequency;
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driver_format.byte_format = AO_FMT_LITTLE;
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ao_option* options = nullptr;
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ao_info *di = ao_driver_info(driver_id);
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if(!di) return false;
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if(!strcmp(di->short_name, "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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audio_device = ao_open_live(driver_id, &driver_format, options);
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if(!audio_device) return false;
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return true;
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}
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auto term() -> void {
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if(audio_device) {
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ao_close(audio_device);
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audio_device = nullptr;
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}
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ao_shutdown();
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}
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};
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