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/*
audio.ao (2008-06-01)
authors: Nach, RedDwarf
*/
#include <ao/ao.h>
namespace ruby {
class pAudioAO {
public:
int driver_id;
ao_sample_format driver_format;
ao_device* audio_device;
struct {
unsigned frequency;
} settings;
bool cap(const string& name) {
if(name == Audio::Frequency) return true;
return false;
}
any get(const string& name) {
if(name == Audio::Frequency) return settings.frequency;
return false;
}
bool set(const string& name, const any& value) {
if(name == Audio::Frequency) {
settings.frequency = any_cast<unsigned>(value);
if(audio_device) init();
return true;
}
return false;
}
void sample(uint16_t l_sample, uint16_t r_sample) {
uint32_t samp = (l_sample << 0) + (r_sample << 16);
ao_play(audio_device, (char*)&samp, 4); //This may need to be byte swapped for Big Endian
}
void clear() {
}
bool init() {
term();
driver_id = ao_default_driver_id(); //ao_driver_id((const char*)driver)
if(driver_id < 0) return false;
driver_format.bits = 16;
driver_format.channels = 2;
driver_format.rate = settings.frequency;
driver_format.byte_format = AO_FMT_LITTLE;
ao_option* options = nullptr;
ao_info *di = ao_driver_info(driver_id);
if(!di) return false;
if(!strcmp(di->short_name, "alsa")) {
ao_append_option(&options, "buffer_time", "100000"); //100ms latency (default was 500ms)
}
audio_device = ao_open_live(driver_id, &driver_format, options);
if(!audio_device) return false;
return true;
}
void term() {
if(audio_device) {
ao_close(audio_device);
audio_device = 0;
}
}
pAudioAO() {
audio_device = 0;
ao_initialize();
settings.frequency = 22050;
}
~pAudioAO() {
term();
//ao_shutdown(); //FIXME: this is causing a segfault for some reason when called ...
}
};
DeclareAudio(AO)
};
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