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Re: [fluid-dev] fluid_sequencer_send_at ignoring time when not using an

From: Pedro Lopez-Cabanillas
Subject: Re: [fluid-dev] fluid_sequencer_send_at ignoring time when not using an audio driver
Date: Sun, 17 Jun 2012 14:02:39 +0200
User-agent: KMail/1.13.5 (Linux/; KDE/4.4.4; i686; ; )

On Thursday 14 June 2012, Raja Mukherji wrote:
> I'm not sure if I'm doing something wrong but it seems as though
> fluid_sequencer_send_at is ignoring the time parameter.
> I'm trying to use fluid_synth_write_float to render music to a buffer
> that I can then encode and stream to a browser. Hence realtime
> rendering is not important, rather rendering as fast as possible is
> desired.
> I've created a sequencer using new_fluid_sequencer2(0) so it's not
> using the system timer. I'm trying to render in 3 second blocks
> (arbitrary for now, I've tried smaller and longer blocks). For each
> block, I create and send all the events for that block. Then I call
> fluid_synth_write_float. It seems that the tick value of the sequencer
> does not change in a manner consistent with the call to
> fluid_synth_write_float so I am adjusting the times for all events in
> a block by the value returned by fluid_sequencer_get_tick and using
> relative times (so the last parameter to fluid_sequencer_send_at is
> false). I have tried using absolute times too, with no difference.

I can't reproduce your problem. Attached is a slightly version of our  
fluidsynth_metronome program that is distributed in the doc/ folder of 

Instead of using an audio driver, this modified program renders 10 bars of 
the metronome pattern to a wav disk file. It uses absolute tick times, like 
the original sample program. The result has all beats where they should be.


Attachment: rendermetronome.c
Description: Text Data

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