Add a LTC generator to the dummy backend
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@ -33,6 +33,7 @@
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#include "dummy_midi_seq.h"
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#include "pbd/error.h"
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#include "pbd/compose.h"
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#include "ardour/port_manager.h"
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#include "pbd/i18n.h"
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@ -127,6 +128,7 @@ DummyAudioBackend::enumerate_devices () const
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_device_status.push_back (DeviceStatus (_("Sine Sweep Swell"), true));
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_device_status.push_back (DeviceStatus (_("Square Sweep"), true));
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_device_status.push_back (DeviceStatus (_("Square Sweep Swell"), true));
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_device_status.push_back (DeviceStatus (_("LTC"), true));
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_device_status.push_back (DeviceStatus (_("Loopback"), true));
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}
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return _device_status;
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@ -849,6 +851,8 @@ DummyAudioBackend::register_system_ports()
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gt = DummyAudioPort::SquareSweep;
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} else if (_device == _("Square Sweep Swell")) {
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gt = DummyAudioPort::SquareSweepSwell;
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} else if (_device == _("LTC")) {
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gt = DummyAudioPort::LTC;
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} else if (_device == _("Loopback")) {
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gt = DummyAudioPort::Loopback;
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} else if (_device == _("Demolition")) {
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@ -1655,13 +1659,19 @@ DummyAudioPort::DummyAudioPort (DummyAudioBackend &b, const std::string& name, P
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, _gen_count2 (0)
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, _pass (false)
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, _rn1 (0)
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, _ltc (0)
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, _ltcbuf (0)
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{
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memset (_buffer, 0, sizeof (_buffer));
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}
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DummyAudioPort::~DummyAudioPort () {
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free(_wavetable);
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ltc_encoder_free (_ltc);
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delete _ltcbuf;
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_wavetable = 0;
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_ltc = 0;
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_ltcbuf = 0;
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}
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static std::string format_hz (float freq) {
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@ -1793,6 +1803,44 @@ DummyAudioPort::setup_generator (GeneratorType const g, float const samplerate,
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}
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}
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break;
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case LTC:
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switch (c % 4) {
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case 0:
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_ltc = ltc_encoder_create (samplerate, 25, LTC_TV_625_50, 0);
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name = "LTC25";
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break;
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case 1:
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_ltc = ltc_encoder_create (samplerate, 30, LTC_TV_1125_60, 0);
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name = "LTC30";
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break;
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case 2:
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_ltc = ltc_encoder_create (samplerate, 30001.f / 1001.f, LTC_TV_525_60, 0);
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name = "LTC29df";
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break;
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case 3:
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_ltc = ltc_encoder_create (samplerate, 24, LTC_TV_FILM_24, 0);
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name = "LTC30";
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break;
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}
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_ltc_spd = 1.0;
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_ltc_rand = floor(c / 4) * .001f;
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if (c < 4) {
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name += " (locked)";
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} else {
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name += " (varspd)";
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}
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SMPTETimecode tc;
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tc.years = 0;
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tc.months = 0;
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tc.days = 0;
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tc.hours = (3 * (c / 4)) % 24; // XXX
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tc.mins = 0;
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tc.secs = 0;
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tc.frame = 0;
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ltc_encoder_set_timecode (_ltc, &tc);
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name += string_compose ("@%1h", (int)tc.hours);
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_ltcbuf = new RingBuffer<Sample> (std::max (DummyAudioBackend::max_buffer_size() * 2.f, samplerate));
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break;
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case Loopback:
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_wavetable = (Sample*) malloc (DummyAudioBackend::max_buffer_size() * sizeof(Sample));
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break;
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@ -1996,6 +2044,28 @@ void DummyAudioPort::generate (const pframes_t n_samples)
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_buffer[i] = _b0 + _b1 + _b2 + white * 0.1848f;
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}
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break;
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case LTC:
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while (_ltcbuf->read_space () < n_samples) {
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// we should pre-allocate (or add a zero-copy libltc API), whatever.
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ltcsnd_sample_t* enc_buf = (ltcsnd_sample_t*) malloc (ltc_encoder_get_buffersize (_ltc) * sizeof (ltcsnd_sample_t));
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for (int byteCnt = 0; byteCnt < 10; byteCnt++) {
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if (_ltc_rand != 0.f) {
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_ltc_spd += randf () * _ltc_rand;
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_ltc_spd = std::min (1.5f, std::max (0.5f, _ltc_spd));
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}
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ltc_encoder_encode_byte (_ltc, byteCnt, _ltc_spd);
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const int len = ltc_encoder_get_buffer (_ltc, enc_buf);
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for (int i = 0; i < len; ++i) {
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const float v1 = enc_buf[i] - 128;
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Sample v = v1 * 0.002;
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_ltcbuf->write (&v, 1);
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}
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}
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ltc_encoder_inc_timecode (_ltc);
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free (enc_buf);
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}
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_ltcbuf->read (_buffer, n_samples);
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break;
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}
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_gen_cycle = true;
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}
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@ -28,9 +28,12 @@
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#include <stdint.h>
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#include <pthread.h>
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#include <ltc.h>
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#include <boost/shared_ptr.hpp>
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#include "pbd/natsort.h"
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#include "pbd/ringbuffer.h"
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#include "ardour/types.h"
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#include "ardour/audio_backend.h"
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#include "ardour/dsp_load_calculator.h"
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@ -167,6 +170,7 @@ class DummyAudioPort : public DummyPort {
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SineSweepSwell,
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SquareSweep,
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SquareSweepSwell,
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LTC,
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Loopback,
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};
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std::string setup_generator (GeneratorType const, float const, int, int);
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@ -194,6 +198,12 @@ class DummyAudioPort : public DummyPort {
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float grandf ();
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bool _pass;
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float _rn1;
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// LTC generator
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LTCEncoder* _ltc;
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RingBuffer<Sample>* _ltcbuf;
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float _ltc_spd;
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float _ltc_rand;
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}; // class DummyAudioPort
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@ -24,7 +24,7 @@ def build(bld):
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obj.includes = ['.']
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obj.name = 'dummy_audiobackend'
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obj.target = 'dummy_audiobackend'
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obj.use = 'libardour libpbd'
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obj.use = 'libardour libpbd libltc'
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obj.uselib = 'GLIBMM XML'
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obj.install_path = os.path.join(bld.env['LIBDIR'], 'backends')
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obj.defines = ['PACKAGE="' + I18N_PACKAGE + '"',
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