#include <cmath>
#include <iostream>
-AudioEnvelope::AudioEnvelope(Mlt::Producer *producer) :
+AudioEnvelope::AudioEnvelope(Mlt::Producer *producer, int offset, int length) :
m_envelope(NULL),
- m_producer(producer),
+ m_offset(offset),
+ m_length(length),
m_envelopeSize(producer->get_length()),
+ m_envelopeMax(0),
m_envelopeStdDevCalculated(false),
m_envelopeIsNormalized(false)
{
+ // make a copy of the producer to avoid audio playback issues
+ m_producer = new Mlt::Producer(*(producer->profile()), producer->get("resource"));
m_info = new AudioInfo(m_producer);
+
+ Q_ASSERT(m_offset >= 0);
+ if (m_length > 0) {
+ Q_ASSERT(m_length+m_offset <= m_envelopeSize);
+ m_envelopeSize = m_length;
+ }
}
AudioEnvelope::~AudioEnvelope()
delete[] m_envelope;
}
delete m_info;
+ delete m_producer;
}
{
return m_envelopeSize;
}
+int64_t AudioEnvelope::maxValue() const
+{
+ return m_envelopeMax;
+}
QTime t;
t.start();
- m_producer->seek(0);
+ int count = 0;
+ m_producer->seek(m_offset);
m_producer->set_speed(1.0); // This is necessary, otherwise we don't get any new frames in the 2nd run.
for (int i = 0; i < m_envelopeSize; i++) {
// << "-" << m_producer->get_in() << "+" << m_producer->get_out() << " ";
delete frame;
+
+ count++;
+ if (m_length > 0 && count > m_length) {
+ break;
+ }
}
m_envelopeMean /= m_envelopeSize;
std::cout << "Calculating the envelope (" << m_envelopeSize << " frames) took "