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I wanna be nasty, I wanna be cruel,..

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Somme disastrous signal generators for QA.
This commit is contained in:
Robin Gareus 2016-04-29 16:08:00 +02:00
parent d574039dd4
commit 69f99ee184
2 changed files with 53 additions and 0 deletions
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51
libs/backends/dummy/dummy_audiobackend.cc
View File

@ -112,6 +112,8 @@ DummyAudioBackend::enumerate_devices () const
{
if (_device_status.empty()) {
_device_status.push_back (DeviceStatus (_("Silence"), true));
_device_status.push_back (DeviceStatus (_("DC -6dBFS (+.5)"), true));
_device_status.push_back (DeviceStatus (_("Demolition"), true));
_device_status.push_back (DeviceStatus (_("Sine Wave"), true));
_device_status.push_back (DeviceStatus (_("Square Wave"), true));
_device_status.push_back (DeviceStatus (_("Impulses"), true));
@ -845,6 +847,10 @@ DummyAudioBackend::register_system_ports()
gt = DummyAudioPort::SquareSweepSwell;
} else if (_device == _("Loopback")) {
gt = DummyAudioPort::Loopback;
} else if (_device == _("Demolition")) {
gt = DummyAudioPort::Demolition;
} else if (_device == _("DC -6dBFS (+.5)")) {
gt = DummyAudioPort::DC05;
} else {
gt = DummyAudioPort::Silence;
}
@ -1659,8 +1665,12 @@ void DummyAudioPort::setup_generator (GeneratorType const g, float const sampler
case PonyNoise:
case UniformWhiteNoise:
case GaussianWhiteNoise:
case DC05:
case Silence:
break;
case Demolition:
_gen_period = 3 * samplerate;
break;
case KronekerDelta:
_gen_period = (5 + randi() % (int)(samplerate / 20.f));
break;
@ -1781,6 +1791,23 @@ float DummyAudioPort::grandf ()
return r * x1;
}
/* inspired by jack-demolition by Steve Harris */
static const float _demolition[] = {
0.0f, /* special case - 0dbFS white noise */
0.0f, /* zero, may cause denomrals following a signal */
0.73 / 1e45, /* very small - should be denormal when floated */
3.7f, /* arbitrary number > 0dBFS */
-4.3f, /* arbitrary negative number > 0dBFS */
4294967395.0f, /* 2^16 + 100 */
-4294967395.0f,
HUGE, /* Big, non-inf number */
1.f/0.f, /* +inf */
-1.f/0.f, /* -inf */
-0.f/0.f, /* -nan */
0.f/0.f, /* nan */
0.0f, /* some silence to check for recovery */
};
void DummyAudioPort::generate (const pframes_t n_samples)
{
Glib::Threads::Mutex::Lock lm (generator_lock);
@ -1792,6 +1819,30 @@ void DummyAudioPort::generate (const pframes_t n_samples)
case Silence:
memset (_buffer, 0, n_samples * sizeof (Sample));
break;
case DC05:
for (pframes_t i = 0 ; i < n_samples; ++i) {
_buffer[i] = 0.5f;
}
break;
case Demolition:
switch (_gen_count2) {
case 0: // noise
for (pframes_t i = 0 ; i < n_samples; ++i) {
_buffer[i] = randf();
}
break;
default:
for (pframes_t i = 0 ; i < n_samples; ++i) {
_buffer[i] = _demolition [_gen_count2];
}
break;
}
_gen_offset += n_samples;
if (_gen_offset > _gen_period) {
_gen_offset = 0;
_gen_count2 = (_gen_count2 + 1) % (sizeof (_demolition) / sizeof (float));
}
break;
case SquareWave:
assert(_gen_period > 0);
for (pframes_t i = 0 ; i < n_samples; ++i) {

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

@ -152,6 +152,8 @@ class DummyAudioPort : public DummyPort {
enum GeneratorType {
Silence,
DC05,
Demolition,
UniformWhiteNoise,
GaussianWhiteNoise,
PinkNoise,