long long
RealTime::realTime2Frame(const RealTime &time, unsigned int sr)
{
if (time < zeroTime) return -realTime2Frame(-time, sr);
long long sampleRate = sr;
// We like integers. The last term is always zero unless the
// sample rate is greater than 1MHz, but hell, you never know...
long frame =
time.sec * sampleRate +
(time.msec() * sampleRate) / 1000 +
((time.usec() - 1000 * time.msec()) * sampleRate) / 1000000 +
((time.nsec - 1000 * time.usec()) * sampleRate) / 1000000000;
return frame;
}
void
SoundDriver::sleep(const RealTime &rt)
{
// The usleep man page says it's deprecated and we should use
// nanosleep. And that's what we did. But it seems quite a few
// people don't have nanosleep, so we're reverting to usleep.
unsigned long usec = rt.sec * 1000000 + rt.usec();
usleep(usec);
}
// scan on from a descriptor position
bool
RIFFAudioFile::scanForward(std::ifstream *file, const RealTime &time)
{
// sanity
if (file == 0)
return false;
unsigned int totalSamples = m_sampleRate * time.sec +
( ( m_sampleRate * time.usec() ) / 1000000 );
unsigned int totalBytes = totalSamples * m_bytesPerFrame;
m_loseBuffer = true;
// do the seek
file->seekg(totalBytes, std::ios::cur);
if (file->eof())
return false;
return true;
}
void
CreateTempoMapFromSegmentCommand::initialise(Segment *s)
{
m_oldTempi.clear();
m_newTempi.clear();
//!!! need an additional option: per-chord, per-beat, per-bar.
// Let's work per-beat for the moment. Even for this, we should
// probably use TimeSignature.getDivisions()
std::vector<timeT> beatTimeTs;
std::vector<RealTime> beatRealTimes;
int startBar = m_composition->getBarNumber(s->getStartTime());
int barNo = startBar;
int beat = 0;
for (Segment::iterator i = s->begin(); s->isBeforeEndMarker(i); ++i) {
if ((*i)->isa(Note::EventType)) {
bool isNew;
TimeSignature sig =
m_composition->getTimeSignatureInBar(barNo, isNew);
beatTimeTs.push_back(m_composition->getBarStart(barNo) +
beat * sig.getBeatDuration());
if (++beat >= sig.getBeatsPerBar()) {
++barNo;
beat = 0;
}
beatRealTimes.push_back(s->getComposition()->getElapsedRealTime
((*i)->getAbsoluteTime()));
}
}
if (beatTimeTs.size() < 2)
return ;
tempoT prevTempo = 0;
// set up m_oldTempi and prevTempo
for (int i = m_composition->getTempoChangeNumberAt(*beatTimeTs.begin() - 1) + 1;
i <= m_composition->getTempoChangeNumberAt(*beatTimeTs.end() - 1); ++i) {
std::pair<timeT, tempoT> tempoChange =
m_composition->getTempoChange(i);
m_oldTempi[tempoChange.first] = tempoChange.second;
if (prevTempo == 0)
prevTempo = tempoChange.second;
}
RG_DEBUG << "starting tempo: " << prevTempo << endl;
timeT quarter = Note(Note::Crotchet).getDuration();
for (size_t beat = 1; beat < beatTimeTs.size(); ++beat) {
timeT beatTime = beatTimeTs[beat] - beatTimeTs[beat - 1];
RealTime beatRealTime = beatRealTimes[beat] - beatRealTimes[beat - 1];
// Calculate tempo to nearest qpm.
// This is 60 / {quarter note duration in seconds}
// = 60 / ( {beat in seconds} * {quarter in ticks} / { beat in ticks} )
// = ( 60 * {beat in ticks} ) / ( {beat in seconds} * {quarter in ticks} )
// Precision is deliberately limited to qpm to avoid silly values.
double beatSec = double(beatRealTime.sec) +
double(beatRealTime.usec() / 1000000.0);
double qpm = (60.0 * beatTime) / (beatSec * quarter);
tempoT tempo = Composition::getTempoForQpm(int(qpm + 0.001));
RG_DEBUG << "prev beat: " << beatTimeTs[beat] << ", prev beat real time " << beatRealTimes[beat] << endl;
RG_DEBUG << "time " << beatTime << ", rt " << beatRealTime << ", beatSec " << beatSec << ", tempo " << tempo << endl;
if (tempo != prevTempo) {
m_newTempi[beatTimeTs[beat - 1]] = tempo;
prevTempo = tempo;
}
}
}
JNIEXPORT jint JNICALL
Java_org_vamp_1plugins_RealTime_usec(JNIEnv *env, jobject obj)
{
RealTime rt = getRealTime(env, obj);
return rt.usec();
}