allanger/ardour
1
0
Fork 0
Code Issues Pull Requests 1 Actions Packages Projects Releases Activity

DummyBackend: two more audio-signal generators (useful for waveform check)

Browse Source
This commit is contained in:
Robin Gareus
2014-09-24 01:11:38 +02:00
parent b355f01aa5
commit 3f9e916fe2
2 changed files with 36 additions and 1 deletions
Download Patch File Download Diff File Expand all files Collapse all files

35
libs/backends/dummy/dummy_audiobackend.cc
View File

@@ -85,6 +85,8 @@ DummyAudioBackend::enumerate_devices () const
if (_device_status.empty()) {
_device_status.push_back (DeviceStatus (_("Silence"), true));
_device_status.push_back (DeviceStatus (_("Sine Wave"), true));
_device_status.push_back (DeviceStatus (_("Square Wave"), true));
_device_status.push_back (DeviceStatus (_("Kroneker Delta"), true));
_device_status.push_back (DeviceStatus (_("Uniform White Noise"), true));
_device_status.push_back (DeviceStatus (_("Gaussian White Noise"), true));
_device_status.push_back (DeviceStatus (_("Pink Noise"), true));
@@ -676,6 +678,10 @@ DummyAudioBackend::register_system_ports()
gt = DummyAudioPort::PonyNoise;
} else if (_device == _("Sine Wave")) {
gt = DummyAudioPort::SineWave;
} else if (_device == _("Square Wave")) {
gt = DummyAudioPort::SquareWave;
} else if (_device == _("Kroneker Delta")) {
gt = DummyAudioPort::KronekerDelta;
} else {
gt = DummyAudioPort::Silence;
}
@@ -1383,12 +1389,18 @@ void DummyAudioPort::setup_generator (GeneratorType const g, float const sampler
case GaussianWhiteNoise:
case Silence:
break;
case KronekerDelta:
_tbl_length = (5 + randi() % (int)(samplerate / 20.f));
break;
case SquareWave:
_tbl_length = (5 + randi() % (int)(samplerate / 20.f)) & ~1;
break;
case SineWave:
{
_tbl_length = 5 + randi() % (int)(samplerate / 20.f);
_wavetable = (Sample*) malloc( _tbl_length * sizeof(Sample));
for (uint32_t i = 0 ; i < _tbl_length; ++i) {
_wavetable[i] = .12589f * sinf(2.0 * M_PI * (float)i / (float)_tbl_length);
_wavetable[i] = .12589f * sinf(2.0 * M_PI * (float)i / (float)_tbl_length); // -18dBFS
}
}
break;
@@ -1430,6 +1442,27 @@ void DummyAudioPort::generate (const pframes_t n_samples)
case Silence:
memset (_buffer, 0, n_samples * sizeof (Sample));
break;
case SquareWave:
assert(_tbl_length > 0);
for (pframes_t i = 0 ; i < n_samples; ++i) {
if (_tbl_offset < _tbl_length * .5) {
_buffer[i] = .40709f; // -6dBFS
} else {
_buffer[i] = -.40709f;
}
_tbl_offset = (_tbl_offset + 1) % _tbl_length;
}
break;
case KronekerDelta:
assert(_tbl_length > 0);
memset (_buffer, 0, n_samples * sizeof (Sample));
for (pframes_t i = 0; i < n_samples; ++i) {
if (_tbl_offset == 0) {
_buffer[i] = 1.0;
}
_tbl_offset = (_tbl_offset + 1) % _tbl_length;
}
break;
case SineWave:
assert(_wavetable && _tbl_length > 0);
{

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

@@ -151,6 +151,8 @@ class DummyAudioPort : public DummyPort {
PinkNoise,
PonyNoise,
SineWave,
SquareWave,
KronekerDelta,
};
void setup_generator (GeneratorType const, float const);