Dummy Backend evolution
- pretty port-names for Dummy generators: show frequency - add 1/3 Octave spaced sine-wave generator
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489cef0913
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@ -116,6 +116,7 @@ DummyAudioBackend::enumerate_devices () const
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_device_status.push_back (DeviceStatus (_("DC -6dBFS (+.5)"), true));
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_device_status.push_back (DeviceStatus (_("Demolition"), true));
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_device_status.push_back (DeviceStatus (_("Sine Wave"), true));
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_device_status.push_back (DeviceStatus (_("Sine Wave 1K, 1/3 Oct"), true));
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_device_status.push_back (DeviceStatus (_("Square Wave"), true));
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_device_status.push_back (DeviceStatus (_("Impulses"), true));
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_device_status.push_back (DeviceStatus (_("Uniform White Noise"), true));
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@ -834,6 +835,8 @@ DummyAudioBackend::register_system_ports()
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gt = DummyAudioPort::PonyNoise;
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} else if (_device == _("Sine Wave")) {
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gt = DummyAudioPort::SineWave;
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} else if (_device == _("Sine Wave 1K, 1/3 Oct")) {
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gt = DummyAudioPort::SineWaveOctaves;
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} else if (_device == _("Square Wave")) {
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gt = DummyAudioPort::SquareWave;
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} else if (_device == _("Impulses")) {
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@ -875,7 +878,10 @@ DummyAudioBackend::register_system_ports()
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if (!p) return -1;
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set_latency_range (p, false, lr);
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_system_inputs.push_back (static_cast<DummyAudioPort*>(p));
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static_cast<DummyAudioPort*>(p)->setup_generator (gt, _samplerate);
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std::string name = static_cast<DummyAudioPort*>(p)->setup_generator (gt, _samplerate, i - 1, a_ins);
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if (!name.empty ()) {
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static_cast<DummyAudioPort*>(p)->set_pretty_name (name);
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}
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}
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lr.min = lr.max = _systemic_output_latency;
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@ -898,8 +904,10 @@ DummyAudioBackend::register_system_ports()
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set_latency_range (p, false, lr);
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_system_midi_in.push_back (static_cast<DummyMidiPort*>(p));
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if (_midi_mode == MidiGenerator) {
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static_cast<DummyMidiPort*>(p)->setup_generator (i % NUM_MIDI_EVENT_GENERATORS, _samplerate);
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static_cast<DummyMidiPort*>(p)->set_pretty_name (DummyMidiData::sequence_names[i % NUM_MIDI_EVENT_GENERATORS]);
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std::string name = static_cast<DummyMidiPort*>(p)->setup_generator (i % NUM_MIDI_EVENT_GENERATORS, _samplerate);
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if (!name.empty ()) {
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static_cast<DummyMidiPort*>(p)->set_pretty_name (name);
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}
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}
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}
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@ -1656,8 +1664,42 @@ DummyAudioPort::~DummyAudioPort () {
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_wavetable = 0;
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}
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void DummyAudioPort::setup_generator (GeneratorType const g, float const samplerate)
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static std::string format_hz (float freq) {
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std::stringstream ss;
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if (freq >= 10000) {
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ss << std::setprecision (1) << std::fixed << freq / 1000 << "KHz";
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} else if (freq >= 1000) {
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ss << std::setprecision (2) << std::fixed << freq / 1000 << "KHz";
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} else {
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ss << std::setprecision (1) << std::fixed << freq << "Hz";
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}
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return ss.str ();
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}
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static size_t fit_wave (float freq, float rate, float precision = 0.001) {
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const size_t max_mult = floor (freq * rate);
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float minErr = 2;
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size_t fact = 1;
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for (size_t i = 1; i < max_mult; ++i) {
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const float isc = rate * (float)i / freq; // ideal sample count
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const float rsc = rintf (isc); // rounded sample count
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const float err = fabsf (isc - rsc);
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if (err < minErr) {
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minErr = err;
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fact = i;
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}
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if (err < precision) {
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break;
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}
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}
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//printf(" FIT %8.1f Hz / %8.1f Hz * %ld = %.0f (err: %e)\n", freq, rate, fact, fact * rate / freq, minErr);
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return fact;
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}
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std::string
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DummyAudioPort::setup_generator (GeneratorType const g, float const samplerate, int c, int total)
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{
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std::string name;
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DummyPort::setup_random_number_generator();
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_gen_type = g;
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@ -1674,12 +1716,29 @@ void DummyAudioPort::setup_generator (GeneratorType const g, float const sampler
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break;
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case KronekerDelta:
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_gen_period = (5 + randi() % (int)(samplerate / 20.f));
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name = "Delta " + format_hz (samplerate / _gen_period);
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break;
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case SquareWave:
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_gen_period = (5 + randi() % (int)(samplerate / 20.f)) & ~1;
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name = "Square " + format_hz (samplerate / _gen_period);
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break;
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case SineWaveOctaves:
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{
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const int x = c - floor (total / 2);
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float f = powf (2.f, x / 3.f) * 1000.f;
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f = std::max (10.f, std::min (samplerate *.5f, f));
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const size_t mult = fit_wave (f, samplerate);
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_gen_period = rintf ((float)mult * samplerate / f);
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name = "Sine " + format_hz (samplerate * mult / (float)_gen_period);
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_wavetable = (Sample*) malloc (_gen_period * sizeof(Sample));
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for (uint32_t i = 0 ; i < _gen_period; ++i) {
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_wavetable[i] = .12589f * sinf(2.0f * M_PI * (float)mult * (float)i / (float)(_gen_period)); // -18dBFS
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}
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}
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break;
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case SineWave:
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_gen_period = 5 + randi() % (int)(samplerate / 20.f);
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name = "Sine " + format_hz (samplerate / _gen_period);
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_wavetable = (Sample*) malloc (_gen_period * sizeof(Sample));
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for (uint32_t i = 0 ; i < _gen_period; ++i) {
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_wavetable[i] = .12589f * sinf(2.0f * M_PI * (float)i / (float)_gen_period); // -18dBFS
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@ -1738,6 +1797,7 @@ void DummyAudioPort::setup_generator (GeneratorType const g, float const sampler
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_wavetable = (Sample*) malloc (DummyAudioBackend::max_buffer_size() * sizeof(Sample));
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break;
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}
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return name;
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}
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void DummyAudioPort::midi_to_wavetable (DummyMidiBuffer const * const src, size_t n_samples)
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@ -1881,6 +1941,7 @@ void DummyAudioPort::generate (const pframes_t n_samples)
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case Loopback:
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_gen_period = n_samples; // XXX DummyBackend::_samples_per_period;
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case SineWave:
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case SineWaveOctaves:
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case SineSweep:
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case SquareSweep:
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assert(_wavetable && _gen_period > 0);
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@ -2004,13 +2065,15 @@ void DummyMidiPort::set_loopback (DummyMidiBuffer const * const src)
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}
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}
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void DummyMidiPort::setup_generator (int seq_id, const float sr)
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std::string
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DummyMidiPort::setup_generator (int seq_id, const float sr)
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{
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DummyPort::setup_random_number_generator();
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_midi_seq_dat = DummyMidiData::sequences[seq_id % NUM_MIDI_EVENT_GENERATORS];
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_midi_seq_spb = sr * .5f; // 120 BPM, beat_time 1.0 per beat.
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_midi_seq_pos = 0;
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_midi_seq_time = 0;
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return DummyMidiData::sequence_names[seq_id];
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}
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void DummyMidiPort::midi_generate (const pframes_t n_samples)
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@ -159,6 +159,7 @@ class DummyAudioPort : public DummyPort {
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PinkNoise,
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PonyNoise,
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SineWave,
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SineWaveOctaves,
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SquareWave,
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KronekerDelta,
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SineSweep,
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@ -167,7 +168,7 @@ class DummyAudioPort : public DummyPort {
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SquareSweepSwell,
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Loopback,
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};
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void setup_generator (GeneratorType const, float const);
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std::string setup_generator (GeneratorType const, float const, int, int);
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void fill_wavetable (const float* d, size_t n_samples) { assert(_wavetable != 0); memcpy(_wavetable, d, n_samples * sizeof(float)); }
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void midi_to_wavetable (DummyMidiBuffer const * const src, size_t n_samples);
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@ -205,7 +206,7 @@ class DummyMidiPort : public DummyPort {
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void* get_buffer (pframes_t nframes);
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const DummyMidiBuffer * const_buffer () const { return &_buffer; }
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void setup_generator (int, float const);
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std::string setup_generator (int, float const);
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void set_loopback (DummyMidiBuffer const * const src);
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private:
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