triggerbox: add RubberBandStretcher for static stretch of regions in slots
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46a64c2eef
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@ -46,7 +46,7 @@ class TriggerBox;
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class LIBARDOUR_API Trigger : public PBD::Stateful {
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public:
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Trigger (size_t index);
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Trigger (size_t index, TriggerBox&);
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virtual ~Trigger() {}
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virtual void bang (TriggerBox&) = 0;
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@ -84,6 +84,10 @@ class LIBARDOUR_API Trigger : public PBD::Stateful {
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Temporal::BBT_Offset quantization() const;
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void set_quantization (Temporal::BBT_Offset const &);
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virtual void set_length (timecnt_t const &) = 0;
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virtual timecnt_t current_length() const = 0;
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virtual timecnt_t natural_length() const = 0;
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bool stop_requested() const { return _stop_requested; }
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virtual void stop();
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virtual void retrigger () {}
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@ -98,6 +102,7 @@ class LIBARDOUR_API Trigger : public PBD::Stateful {
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int set_state (const XMLNode&, int version);
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protected:
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TriggerBox& _box;
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bool _running;
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bool _stop_requested;
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size_t _index;
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@ -111,7 +116,7 @@ class LIBARDOUR_API Trigger : public PBD::Stateful {
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class LIBARDOUR_API AudioTrigger : public Trigger {
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public:
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AudioTrigger (size_t index);
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AudioTrigger (size_t index, TriggerBox&);
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~AudioTrigger ();
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void bang (TriggerBox&);
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@ -119,13 +124,17 @@ class LIBARDOUR_API AudioTrigger : public Trigger {
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Sample* run (uint32_t channel, pframes_t& nframes, bool& need_butler);
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void set_length (timecnt_t const &);
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timecnt_t current_length() const;
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timecnt_t natural_length() const;
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int set_region (boost::shared_ptr<Region>);
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void retrigger ();
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private:
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std::vector<Sample*> data;
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std::vector<samplecnt_t> read_index;
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samplecnt_t length;
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samplecnt_t data_length;
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void drop_data ();
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int load_data (boost::shared_ptr<AudioRegion>);
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@ -1,5 +1,7 @@
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#include <iostream>
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#include <rubberband/RubberBandStretcher.h>
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#include "pbd/basename.h"
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#include "pbd/failed_constructor.h"
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@ -31,7 +33,7 @@ TriggerBox::TriggerBox (Session& s, DataType dt)
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if (_data_type == DataType::AUDIO) {
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for (size_t n = 0; n < 16; ++n) {
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all_triggers.push_back (new AudioTrigger (n));
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all_triggers.push_back (new AudioTrigger (n, *this));
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}
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}
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@ -418,8 +420,9 @@ TriggerBox::set_state (const XMLNode&, int version)
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/*--------------------*/
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Trigger::Trigger (size_t n)
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: _running (false)
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Trigger::Trigger (size_t n, TriggerBox& b)
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: _box (b)
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, _running (false)
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, _stop_requested (false)
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, _index (n)
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, _launch_style (Loop)
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@ -478,10 +481,10 @@ Trigger::stop ()
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/*--------------------*/
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AudioTrigger::AudioTrigger (size_t n)
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: Trigger (n)
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AudioTrigger::AudioTrigger (size_t n, TriggerBox& b)
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: Trigger (n, b)
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, data (0)
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, length (0)
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, data_length (0)
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{
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}
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@ -492,6 +495,110 @@ AudioTrigger::~AudioTrigger ()
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}
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}
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void
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AudioTrigger::set_length (timecnt_t const & newlen)
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{
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using namespace RubberBand;
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using namespace Temporal;
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if (!_region) {
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return;
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}
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boost::shared_ptr<AudioRegion> ar (boost::dynamic_pointer_cast<AudioRegion> (_region));
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/* load raw data */
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load_data (ar);
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if (newlen == _region->length()) {
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/* no stretch required */
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return;
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}
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/* offline stretch */
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/* study */
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const uint32_t nchans = ar->n_channels();
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RubberBandStretcher::Options options = RubberBandStretcher::Option (RubberBandStretcher::OptionProcessRealTime|RubberBandStretcher::OptionStretchPrecise);
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RubberBandStretcher stretcher (_box.session().sample_rate(), nchans, options, 1.0, 1.0);
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/* Compute stretch ratio */
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double new_ratio;
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if (newlen.time_domain() == AudioTime) {
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new_ratio = (double) newlen.samples() / data_length;
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} else {
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/* XXX what to use for position ??? */
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const timecnt_t dur = TempoMap::use()->convert_duration (newlen, timepos_t (0), AudioTime);
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new_ratio = (double) dur.samples() / data_length;
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}
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stretcher.setTimeRatio (new_ratio);
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/* RB expects array-of-ptr-to-Sample, so set one up */
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Sample* pdata[nchans];
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for (uint32_t n = 0; n < nchans; ++n) {
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pdata[n] = data[n];
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}
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/* study, then process */
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stretcher.setMaxProcessSize (data_length);
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stretcher.setExpectedInputDuration (data_length);
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stretcher.study (pdata, _region->length_samples(), true);
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stretcher.process (pdata, _region->length_samples(), true);
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/* how many samples did we end up with? */
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samplecnt_t plen = stretcher.available();
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/* allocate new data buffers */
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drop_data ();
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for (uint32_t n = 0; n < nchans; ++n) {
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data.push_back (new Sample[plen]);
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}
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/* reset pdata to point to newly allocated buffers */
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for (uint32_t n = 0; n < nchans; ++n) {
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pdata[n] = data[n];
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}
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/* fetch it all */
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stretcher.retrieve (pdata, plen);
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/* store length */
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data_length = plen;
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}
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timecnt_t
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AudioTrigger::current_length() const
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{
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if (_region) {
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return timecnt_t (data_length);
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}
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return timecnt_t (Temporal::BeatTime);
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}
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timecnt_t
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AudioTrigger::natural_length() const
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{
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if (_region) {
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return _region->length();
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}
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return timecnt_t (Temporal::BeatTime);
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}
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int
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AudioTrigger::set_region (boost::shared_ptr<Region> r)
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{
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@ -503,9 +610,9 @@ AudioTrigger::set_region (boost::shared_ptr<Region> r)
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set_region_internal (r);
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if (load_data (ar)) {
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return -1;
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}
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/* this will load data, but won't stretch it for now */
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set_length (r->length ());
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PropertyChanged (ARDOUR::Properties::name);
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@ -526,15 +633,15 @@ AudioTrigger::load_data (boost::shared_ptr<AudioRegion> ar)
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{
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const uint32_t nchans = ar->n_channels();
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length = ar->length_samples();
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data_length = ar->length_samples();
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drop_data ();
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try {
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for (uint32_t n = 0; n < nchans; ++n) {
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data.push_back (new Sample[length]);
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data.push_back (new Sample[data_length]);
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read_index.push_back (0);
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ar->read (data[n], 0, length, n);
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ar->read (data[n], 0, data_length, n);
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}
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} catch (...) {
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drop_data ();
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@ -607,7 +714,7 @@ AudioTrigger::run (uint32_t channel, pframes_t& nframes, bool& /* need_butler */
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return 0;
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}
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if (read_index[channel] >= length) {
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if (read_index[channel] >= data_length) {
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_running = false;
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return 0;
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}
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@ -621,7 +728,7 @@ AudioTrigger::run (uint32_t channel, pframes_t& nframes, bool& /* need_butler */
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channel %= data.size();
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nframes = (pframes_t) std::min ((samplecnt_t) nframes, (length - read_index[channel]));
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nframes = (pframes_t) std::min ((samplecnt_t) nframes, (data_length - read_index[channel]));
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read_index[channel] += nframes;
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return data[channel] + read_index[channel];
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