Hi Dan,
I looked at Shotcut, and saw that is has audio levels monitoring
meter, which no other open source video application has to my
knowledge.
Browsing the code I found that first you have method:
Player::showAudio(Mlt::Frame* frame)
which gets audio data from mlt.Frame object and then sends samples to:
AudioSignal::slotReceiveAudio(const QVector<int16_t>& data, int,
int num_channels, int samples)
which then calculates a double value to each channel. After that
values are converted to decibels and drawn.
In principal I could do this in Flowblade using mltFrame.get_audio()
and doing all the same operations, but I'm afraid I'm going to get
killed by Pythons low performance if I try to do this per frame for 10
channels.
Would it possible to combine code in Player::showAudio() and
AudioSignal::slotReceiveAudio() audio and drop it to mlt_frame.c, and
then expose this, so I could do something like:
channel_levels = produce.get_frame().get_channel_levels()
ch1_level, ch2_level = channel_levels
and then convert to decibels and draw the meters.
There may be better ways to do this, like calculating decibel values
in mlt_frame.c also, then all the MLT users would get it right.
Do you think this doable/good idea?
Janne
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