Пример #1
0
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;
}
Пример #2
0
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);
}
Пример #3
0
// 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;
        }
    }

}
Пример #5
0
JNIEXPORT jint JNICALL
Java_org_vamp_1plugins_RealTime_usec(JNIEnv *env, jobject obj)
{
    RealTime rt = getRealTime(env, obj);
    return rt.usec();
}