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https://github.com/Ardour/ardour.git
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refactor AudioTrigger::estimate_tempo() into ARDOUR::estimate_audio_tempo()
This commit is contained in:
Paul Davis
parent
c59dddfdae
commit
cec3db54f0
3 changed files with 141 additions and 117 deletions
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@ -44,10 +44,15 @@
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class XMLNode;
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namespace Temporal {
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class Meter;
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}
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namespace ARDOUR {
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class Route;
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class Track;
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class Region;
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LIBARDOUR_API std::string legalize_for_path (const std::string& str);
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LIBARDOUR_API std::string legalize_for_universal_path (const std::string& str);
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@ -146,6 +151,8 @@ template<typename T> std::shared_ptr<AutomationControlList> stripable_list_to_co
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return cl;
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}
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LIBARDOUR_API bool estimate_audio_tempo (std::shared_ptr<Region> region, Sample* data, samplecnt_t data_length, samplecnt_t sample_rate, double& qpm, Temporal::Meter& meter, double& beatcount);
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#if __APPLE__
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LIBARDOUR_API std::string CFStringRefToStdString(CFStringRef stringRef);
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#endif // __APPLE__
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@ -1773,123 +1773,11 @@ AudioTrigger::set_region_in_worker_thread_internal (std::shared_ptr<Region> r, b
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void
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AudioTrigger::estimate_tempo ()
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{
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using namespace Temporal;
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TempoMap::SharedPtr tm (TempoMap::use());
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double beatcount;
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ARDOUR::estimate_audio_tempo (_region, data[0], data.length, _box.session().sample_rate(), _estimated_tempo, _meter, beatcount);
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/* initialize our follow_length to match the beatcnt ... user can later change this value to have the clip end sooner or later than its data length */
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set_follow_length(Temporal::BBT_Offset( 0, rint(beatcount), 0));
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TimelineRange range (_region->start(), _region->start() + _region->length(), 0);
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SegmentDescriptor segment;
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bool have_segment;
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have_segment = _region->source (0)->get_segment_descriptor (range, segment);
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if (have_segment) {
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_estimated_tempo = segment.tempo().quarter_notes_per_minute ();
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_meter = segment.meter();
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DEBUG_TRACE (DEBUG::Triggers, string_compose ("%1: tempo and meter from segment descriptor\n", index()));
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} else {
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/* not a great guess, but what else can we do? */
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TempoMetric const & metric (tm->metric_at (timepos_t (AudioTime)));
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_meter = metric.meter ();
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/* check the name to see if there's a (heuristically obvious) hint
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* about the tempo.
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*/
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string str = _region->name();
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string::size_type bi;
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string::size_type ni;
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double text_tempo = -1.;
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if (((bi = str.find (" bpm")) != string::npos) ||
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((bi = str.find ("bpm")) != string::npos) ||
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((bi = str.find (" BPM")) != string::npos) ||
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((bi = str.find ("BPM")) != string::npos) ){
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string sub (str.substr (0, bi));
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if ((ni = sub.find_last_of ("0123456789.,_-")) != string::npos) {
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int nni = ni; /* ni is unsigned, nni is signed */
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while (nni >= 0) {
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if (!isdigit (sub[nni]) &&
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(sub[nni] != '.') &&
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(sub[nni] != ',')) {
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break;
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}
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--nni;
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}
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if (nni > 0) {
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std::stringstream p (sub.substr (nni + 1));
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p >> text_tempo;
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if (!p) {
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text_tempo = -1.;
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} else {
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_estimated_tempo = text_tempo;
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}
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}
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}
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}
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if (text_tempo < 0) {
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breakfastquay::MiniBPM mbpm (_box.session().sample_rate());
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_estimated_tempo = mbpm.estimateTempoOfSamples (data[0], data.length);
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//cerr << name() << "MiniBPM Estimated: " << _estimated_tempo << " bpm from " << (double) data.length / _box.session().sample_rate() << " seconds\n";
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}
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}
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const double seconds = (double) data.length / _box.session().sample_rate();
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/* now check the determined tempo and force it to a value that gives us
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an integer beat/quarter count. This is a heuristic that tries to
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avoid clips that slightly over- or underrun a quantization point,
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resulting in small or larger gaps in output if they are repeating.
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*/
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if ((_estimated_tempo != 0.)) {
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/* fractional beatcnt */
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double maybe_beats = (seconds / 60.) * _estimated_tempo;
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double beatcount = round (maybe_beats);
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/* the vast majority of third-party clips are 1,2,4,8, or 16-bar 'beats'.
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* Given no other metadata, it makes things 'just work' if we assume 4/4 time signature, and power-of-2 bars (1,2,4,8 or 16)
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* TODO: someday we could provide a widget for users who have unlabeled, un-metadata'd, clips that they *know* are 3/4 or 5/4 or 11/4 */
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{
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double barcount = round (beatcount/4);
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if (barcount <= 18) { /* why not 16 here? fuzzy logic allows minibpm to misjudge the clip a bit */
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for (int pwr = 0; pwr <= 4; pwr++) {
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float bc = pow(2,pwr);
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if (barcount <= bc) {
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barcount = bc;
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break;
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}
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}
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}
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beatcount = round(barcount * 4);
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}
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DEBUG_RESULT (double, est, _estimated_tempo);
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_estimated_tempo = beatcount / (seconds/60.);
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DEBUG_TRACE (DEBUG::Triggers, string_compose ("given original estimated tempo %1, rounded beatcnt is %2 : resulting in working bpm = %3\n", est, _beatcnt, _estimated_tempo));
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/* initialize our follow_length to match the beatcnt ... user can later change this value to have the clip end sooner or later than its data length */
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set_follow_length(Temporal::BBT_Offset( 0, rint(beatcount), 0));
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}
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#if 0
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cerr << "estimated tempo: " << _estimated_tempo << endl;
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const samplecnt_t one_beat = tm->bbt_duration_at (timepos_t (AudioTime), BBT_Offset (0, 1, 0)).samples();
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cerr << "one beat in samples: " << one_beat << endl;
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cerr << "rounded beatcount = " << round (beatcount) << endl;
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#endif
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}
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bool
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@ -60,8 +60,14 @@
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#include "pbd/strsplit.h"
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#include "pbd/replace_all.h"
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#include "ardour/utils.h"
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#include "temporal/tempo.h"
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#include "ardour/minibpm.h"
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#include "ardour/region.h"
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#include "ardour/rc_configuration.h"
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#include "ardour/segment_descriptor.h"
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#include "ardour/source.h"
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#include "ardour/utils.h"
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#include "pbd/i18n.h"
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@ -793,3 +799,126 @@ ARDOUR::compute_sha1_of_file (std::string path)
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sha1_result_hash (&s, hash);
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return std::string (hash);
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}
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bool
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ARDOUR::estimate_audio_tempo (std::shared_ptr<Region> region, Sample* data, samplecnt_t data_length, samplecnt_t sample_rate, double& qpm, Temporal::Meter& meter, double& beatcount)
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{
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using namespace Temporal;
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TempoMap::SharedPtr tm (TempoMap::use());
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TimelineRange range (region->start(), region->start() + region->length(), 0);
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SegmentDescriptor segment;
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bool have_segment;
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have_segment = region->source (0)->get_segment_descriptor (range, segment);
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if (have_segment) {
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qpm = segment.tempo().quarter_notes_per_minute ();
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meter = segment.meter();
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// DEBUG_TRACE (DEBUG::Triggers, string_compose ("%1: tempo and meter from segment descriptor\n", index()));
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} else {
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/* not a great guess, but what else can we do? */
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TempoMetric const & metric (tm->metric_at (timepos_t (AudioTime)));
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meter = metric.meter ();
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/* check the name to see if there's a (heuristically obvious) hint
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* about the tempo.
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*/
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string str = region->name();
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string::size_type bi;
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string::size_type ni;
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double text_tempo = -1.;
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if (((bi = str.find (" bpm")) != string::npos) ||
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((bi = str.find ("bpm")) != string::npos) ||
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((bi = str.find (" BPM")) != string::npos) ||
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((bi = str.find ("BPM")) != string::npos) ){
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string sub (str.substr (0, bi));
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if ((ni = sub.find_last_of ("0123456789.,_-")) != string::npos) {
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int nni = ni; /* ni is unsigned, nni is signed */
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while (nni >= 0) {
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if (!isdigit (sub[nni]) &&
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(sub[nni] != '.') &&
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(sub[nni] != ',')) {
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break;
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}
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--nni;
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}
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if (nni > 0) {
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std::stringstream p (sub.substr (nni + 1));
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p >> text_tempo;
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if (!p) {
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text_tempo = -1.;
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} else {
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qpm = text_tempo;
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}
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}
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}
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}
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if (text_tempo < 0) {
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breakfastquay::MiniBPM mbpm (sample_rate);
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qpm = mbpm.estimateTempoOfSamples (data, data_length);
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//cerr << name() << "MiniBPM Estimated: " << qpm << " bpm from " << (double) data.length / _box.session().sample_rate() << " seconds\n";
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}
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}
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const double seconds = (double) data_length / sample_rate;
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/* now check the determined tempo and force it to a value that gives us
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an integer beat/quarter count. This is a heuristic that tries to
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avoid clips that slightly over- or underrun a quantization point,
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resulting in small or larger gaps in output if they are repeating.
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*/
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if ((qpm != 0.)) {
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/* fractional beatcnt */
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double maybe_beats = (seconds / 60.) * qpm;
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beatcount = round (maybe_beats);
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/* the vast majority of third-party clips are 1,2,4,8, or 16-bar 'beats'.
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* Given no other metadata, it makes things 'just work' if we assume 4/4 time signature, and power-of-2 bars (1,2,4,8 or 16)
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* TODO: someday we could provide a widget for users who have unlabeled, un-metadata'd, clips that they *know* are 3/4 or 5/4 or 11/4 */
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{
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double barcount = round (beatcount/4);
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if (barcount <= 18) { /* why not 16 here? fuzzy logic allows minibpm to misjudge the clip a bit */
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for (int pwr = 0; pwr <= 4; pwr++) {
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float bc = pow(2,pwr);
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if (barcount <= bc) {
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barcount = bc;
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break;
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}
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}
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}
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beatcount = round(barcount * 4);
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}
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// DEBUG_RESULT (double, est, qpm);
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qpm = beatcount / (seconds/60.);
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// DEBUG_TRACE (DEBUG::Triggers, string_compose ("given original estimated tempo %1, rounded beatcnt is %2 : resulting in working bpm = %3\n", est, _beatcnt, qpm));
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}
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#if 0
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cerr << "estimated tempo: " << qpm << endl;
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const samplecnt_t one_beat = tm->bbt_duration_at (timepos_t (AudioTime), BBT_Offset (0, 1, 0)).samples();
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cerr << "one beat in samples: " << one_beat << endl;
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cerr << "rounded beatcount = " << round (beatcount) << endl;
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#endif
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return true;
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}
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