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//audio.pulseaudio (2010-01-05)
//author: RedDwarf
#include <pulse/pulseaudio.h>
namespace ruby {
class pAudioPulseAudio {
public:
struct {
pa_mainloop* mainloop;
pa_context* context;
pa_stream* stream;
pa_sample_spec spec;
pa_buffer_attr buffer_attr;
bool first;
} device;
struct {
uint32_t* data;
size_t size;
unsigned offset;
} buffer;
struct {
bool synchronize;
unsigned frequency;
unsigned latency;
} settings;
bool cap(const string& name) {
if(name == Audio::Synchronize) return true;
if(name == Audio::Frequency) return true;
if(name == Audio::Latency) return true;
}
any get(const string& name) {
if(name == Audio::Synchronize) return settings.synchronize;
if(name == Audio::Frequency) return settings.frequency;
if(name == Audio::Latency) return settings.latency;
}
bool set(const string& name, const any& value) {
if(name == Audio::Synchronize) {
settings.synchronize = any_cast<bool>(value);
return true;
}
if(name == Audio::Frequency) {
settings.frequency = any_cast<unsigned>(value);
if(device.stream) {
pa_operation_unref(pa_stream_update_sample_rate(device.stream, settings.frequency, NULL, NULL));
}
return true;
}
if(name == Audio::Latency) {
settings.latency = any_cast<unsigned>(value);
if(device.stream) {
device.buffer_attr.tlength = pa_usec_to_bytes(settings.latency * PA_USEC_PER_MSEC, &device.spec);
pa_stream_set_buffer_attr(device.stream, &device.buffer_attr, NULL, NULL);
}
return true;
}
}
void sample(uint16_t left, uint16_t right) {
pa_stream_begin_write(device.stream, (void**)&buffer.data, &buffer.size);
buffer.data[buffer.offset++] = left + (right << 16);
if((buffer.offset + 1) * pa_frame_size(&device.spec) <= buffer.size) return;
while(true) {
if(device.first) {
device.first = false;
pa_mainloop_iterate(device.mainloop, 0, NULL);
} else {
pa_mainloop_iterate(device.mainloop, 1, NULL);
}
unsigned length = pa_stream_writable_size(device.stream);
if(length >= buffer.offset * pa_frame_size(&device.spec)) break;
if(settings.synchronize == false) {
buffer.offset = 0;
return;
}
}
pa_stream_write(device.stream, (const void*)buffer.data, buffer.offset * pa_frame_size(&device.spec), NULL, 0LL, PA_SEEK_RELATIVE);
buffer.data = 0;
buffer.offset = 0;
}
void clear() {
}
bool init() {
device.mainloop = pa_mainloop_new();
device.context = pa_context_new(pa_mainloop_get_api(device.mainloop), "ruby::pulseaudio");
pa_context_connect(device.context, NULL, PA_CONTEXT_NOFLAGS, NULL);
pa_context_state_t cstate;
do {
pa_mainloop_iterate(device.mainloop, 1, NULL);
cstate = pa_context_get_state(device.context);
if(!PA_CONTEXT_IS_GOOD(cstate)) return false;
} while(cstate != PA_CONTEXT_READY);
device.spec.format = PA_SAMPLE_S16LE;
device.spec.channels = 2;
device.spec.rate = settings.frequency;
device.stream = pa_stream_new(device.context, "audio", &device.spec, NULL);
device.buffer_attr.maxlength = -1;
device.buffer_attr.tlength = pa_usec_to_bytes(settings.latency * PA_USEC_PER_MSEC, &device.spec);
device.buffer_attr.prebuf = -1;
device.buffer_attr.minreq = -1;
device.buffer_attr.fragsize = -1;
pa_stream_flags_t flags = (pa_stream_flags_t)(PA_STREAM_ADJUST_LATENCY | PA_STREAM_VARIABLE_RATE);
pa_stream_connect_playback(device.stream, NULL, &device.buffer_attr, flags, NULL, NULL);
pa_stream_state_t sstate;
do {
pa_mainloop_iterate(device.mainloop, 1, NULL);
sstate = pa_stream_get_state(device.stream);
if(!PA_STREAM_IS_GOOD(sstate)) return false;
} while(sstate != PA_STREAM_READY);
buffer.size = 960;
buffer.offset = 0;
device.first = true;
return true;
}
void term() {
if(buffer.data) {
pa_stream_cancel_write(device.stream);
buffer.data = 0;
}
if(device.stream) {
pa_stream_disconnect(device.stream);
pa_stream_unref(device.stream);
device.stream = 0;
}
if(device.context) {
pa_context_disconnect(device.context);
pa_context_unref(device.context);
device.context = 0;
}
if(device.mainloop) {
pa_mainloop_free(device.mainloop);
device.mainloop = 0;
}
}
pAudioPulseAudio() {
device.mainloop = 0;
device.context = 0;
device.stream = 0;
buffer.data = 0;
settings.synchronize = false;
settings.frequency = 22050;
settings.latency = 60;
}
~pAudioPulseAudio() {
term();
}
};
DeclareAudio(PulseAudio)
}
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