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dummy: add square wave frequency sweep generators

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This commit is contained in:
Robin Gareus 2015-02-21 05:05:48 +01:00
parent a0eeb80885
commit bf1d12708d
2 changed files with 22 additions and 0 deletions
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20
libs/backends/dummy/dummy_audiobackend.cc
View File

@ -112,6 +112,8 @@ DummyAudioBackend::enumerate_devices () const
_device_status.push_back (DeviceStatus (_("Pink Noise (low CPU)"), true));
_device_status.push_back (DeviceStatus (_("Sine Sweep"), true));
_device_status.push_back (DeviceStatus (_("Sine Sweep Swell"), true));
_device_status.push_back (DeviceStatus (_("Square Sweep"), true));
_device_status.push_back (DeviceStatus (_("Square Sweep Swell"), true));
_device_status.push_back (DeviceStatus (_("Loopback"), true));
}
return _device_status;
@ -744,6 +746,10 @@ DummyAudioBackend::register_system_ports()
gt = DummyAudioPort::SineSweep;
} else if (_device == _("Sine Sweep Swell")) {
gt = DummyAudioPort::SineSweepSwell;
} else if (_device == _("Square Sweep")) {
gt = DummyAudioPort::SquareSweep;
} else if (_device == _("Square Sweep Swell")) {
gt = DummyAudioPort::SquareSweepSwell;
} else if (_device == _("Loopback")) {
gt = DummyAudioPort::Loopback;
} else {
@ -1563,6 +1569,8 @@ void DummyAudioPort::setup_generator (GeneratorType const g, float const sampler
_wavetable[i] = .12589f * sinf(2.0f * M_PI * (float)i / (float)_gen_period); // -18dBFS
}
break;
case SquareSweep:
case SquareSweepSwell:
case SineSweep:
case SineSweepSwell:
{
@ -1597,6 +1605,16 @@ void DummyAudioPort::setup_generator (GeneratorType const g, float const sampler
#endif
_wavetable[i] = (float)sin (2. * M_PI * (phase - floor (phase)));
}
if (_gen_type == SquareSweep) {
for (uint32_t i = 0 ; i < _gen_period; ++i) {
_wavetable[i] = _wavetable[i] < 0 ? -.40709f : .40709f;
}
}
else if (_gen_type == SquareSweepSwell) {
for (uint32_t i = 0 ; i < _gen_period; ++i) {
_wavetable[i] = _wavetable[i] < 0 ? -1 : 1;
}
}
}
break;
case Loopback:
@ -1690,6 +1708,7 @@ void DummyAudioPort::generate (const pframes_t n_samples)
}
break;
case SineSweepSwell:
case SquareSweepSwell:
assert(_wavetable && _gen_period > 0);
{
const float vols = 2.f / (float)_gen_perio2;
@ -1705,6 +1724,7 @@ void DummyAudioPort::generate (const pframes_t n_samples)
_gen_period = n_samples; // XXX DummyBackend::_samples_per_period;
case SineWave:
case SineSweep:
case SquareSweep:
assert(_wavetable && _gen_period > 0);
{
pframes_t written = 0;

2
libs/backends/dummy/dummy_audiobackend.h
View File

@ -156,6 +156,8 @@ class DummyAudioPort : public DummyPort {
KronekerDelta,
SineSweep,
SineSweepSwell,
SquareSweep,
SquareSweepSwell,
Loopback,
};
void setup_generator (GeneratorType const, float const);