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Re: [fluid-dev] Re : Re: Re : no effects applied using multiple stereo c
Re: [fluid-dev] Re : Re: Re : no effects applied using multiple stereo channels
Fri, 10 Apr 2015 20:05:31 +0200
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Le 10/04/2015 15:56, Tom M. a écrit :
This Jack behavior is a mistery for me. But one think is sure, by
reading the code in the Mixer we can see that:
1) The setting - L 3 set the number of buffer (buff_count = 3) on Mixer
2) And we can see that the mapping of Voices to the buffers depends of
this number (buff_count)
followed by starting fluidsynth:
fluidsynth -a jack -L 3 my.sf2
and then capturing the output of fluidsynth. All midi channels were
clearly hearable, again, reverb was missing.
Restarting fluidsynth changing -L to 1 and reverb works fine again.
Note that I didn't changed jack in any way.
and the MIDI_Channel_number of the voice. As This:
Buffer index = 2 x ( MIDI_Channel_number modulo buff_count).
So Voice MIDI Channel 0,3,6... go to Buffer 0
Voice MIDI Channel 1,4,7... go to Buffer 1
Voice MIDI Channel 2,5,8... go to Buffer 2
3)At the same time alls the voices output are mixed to the Reberb input
Than, after reverb processing, the Reverb output is mixed to the Buffer
0 (this is the default Mix mode for reverb).
This is the end of Mixer processing with resulting audio in Buffer 0, 1
4)Now theses buffers are the input buffer for any Audio Driver used
Really i don't know how Jack Driver handle theses input buffers, but
this buffers are passed to Jack Driver by the Audio rendering function.
If you can heard Voice MIDI Channel 0,3,6 you should heard reberb .
If you cannot heard Reverb , i don't understand how you can hear Voice
MIDI Channel 0,3,6.
It seems there is something wrong beetween the Audio Rendering function
and Jack audio driver ? Please ask David H.
Another thing that strikes me: There is an option called
audio.jack.multi. The documentation says:
"If 'yes' then create separate output ports for reverb and chorus effects."
The documentation is here
I am sorry, but i read only this:
If 1 (TRUE), then multi-channel Jack output will be enabled if
synth.audio-channels is greater than 1.