Hi all,

I'm very new to CSound and I *think* I'm just looking for pointers on where
to learn more.

What I'm trying to do is, using the CSound library on Android, I'd like to
load a soundfont and then, from Android, send noteondur commands to play
procedurally generated MIDI music.

I think I've found examples of a csd file that will load a soundfont and map
instruments to channels, but the interface from Android <-> CSound is a bit
of a mystery to me.

I also feel like I'd like to ask, will it be possible to play an arbitrary
number of tones at the same time (ie: not just a single note/channel, but
also double stops and chords)?  I know it's possible in a csd file, as I've
seen that, but I'm not sure about the interface, again, and so I'm unsure
about multiple noteondur commands.

(Is it possible to simply, in Android, call a function to execute those
commands, or do they have to be built into a csd file?)

I'm sorry about all the super newbie questions.  If someone has a pointer to
a place where I could start reading that may be the best answer.



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Hi Nicole,

Csound has a different model in regards to notes/polyphony than does
MIDI, but essentially yes, you'll be able to have unlimited polyphony
(limited of course by CPU).  In general, to have two notes of the same
instrument to play, you can use a score like:

i1 0 2 8.00 -12
i1 0 2 8.04 -12

That would be two notes at pch 8.00 and 8.04 and at amp of -12db.  The
same score that is written out in a CSD can be sent in realtime to
Csound.  In Android, you would use the CsoundObj object, specifically
the sendScore() method.  That could be used like:

String sco = "i1 0 2 8.00 -12\n
i1 0 2 8.04 -12";

csoundObj.sendScore(sco);

where the start times of the notes are relative to the time at which
the score is read by Csound.  (i.e. using 0 means "play now", and
using "1.0" would mean "play in one beat from now").

Regarding Android, you may want to look at the Examples project that
comes with the Csound for Android SDK.  In the
src/com/csounds/examples/tests folder, you will find
ButtonTestActivity, which has an example of a note being generated and
sent to CsoundObj.

Regarding timing, there's a few approaches you can take.  The first is
that you pre-generate the whole score and send it to Csound. This
guarantees timing of events to be accurate.  The second is that you
could use your own thread to send events as necessary. This is
probably easiest if you're doing things in realtime, but you will have
some jitter of event timing as you don't have exact control over when
the event will be read.  Finally, you could create your own
ValueCacheable and add that to the CsoundObj object.  The
ValueCacheable is called every time an audio buffer's worth of data is
calculated.  This means you get buffer-accurate timing, though it may
be a bit more complicated to develop.  (I.e. you'll have to be sure
your event generation work does not slow down the Csound thread such
that a buffer underrun happens).

Hope that was helpful; if you have further questions, please feel free
to reply here.

Good luck!
steven

On Sun, Mar 16, 2014 at 2:58 PM, Nicoles  wrote:
> Hi all,
>
> I'm very new to CSound and I *think* I'm just looking for pointers on where
> to learn more.
>
> What I'm trying to do is, using the CSound library on Android, I'd like to
> load a soundfont and then, from Android, send noteondur commands to play
> procedurally generated MIDI music.
>
> I think I've found examples of a csd file that will load a soundfont and map
> instruments to channels, but the interface from Android <-> CSound is a bit
> of a mystery to me.
>
> I also feel like I'd like to ask, will it be possible to play an arbitrary
> number of tones at the same time (ie: not just a single note/channel, but
> also double stops and chords)?  I know it's possible in a csd file, as I've
> seen that, but I'm not sure about the interface, again, and so I'm unsure
> about multiple noteondur commands.
>
> (Is it possible to simply, in Android, call a function to execute those
> commands, or do they have to be built into a csd file?)
>
> I'm sorry about all the super newbie questions.  If someone has a pointer to
> a place where I could start reading that may be the best answer.
>
>
>
> --
> View this message in context: http://csound.1045644.n5.nabble.com/CSound-soundfonts-MIDI-and-Android-tp5733261.html
> Sent from the Csound - General mailing list archive at Nabble.com.
>
>
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