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From: Bernard B. <ber...@gm...> - 2020-10-28 11:32:35
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Finally, the "check Trace file" option doesn't work because a file may be visible before it is closed — even if it is never closed… It was confusing because sometimes bp has enough time to finish the score and sometimes csound throws its plate off the table… So I modified the console to create this "done.txt" file which the interface waits for and then deletes. Creating files as flags in a process is an old strategy I was using when programming on archive servers. Probably my young colleagues would smile at it! ;-) At least it is not system-dependent. Bernard ------- In fact, no need to create "done.txt": I made a loop to wait until the Trace file has been created. This is acceptable only because the PHP interface always calls option "--traceout". We could indeed force "bp" to do a trace whenever it needs to create output files : Csound, MIDI or images… For the moment I wouldn't change anything because if you call the console via the Terminal, then you will wait physically for sufficient time before running Csound. So this would only be a problem for creating shell scripts or designing a different interface. But we agree that the current PHP interface is used as a "reference" for writing the required code, don't we? ;-) Bernard ------- Dear Anthony, The whole chain of producing sound via BP and Csound works, as you can see on the attached image. You will notice that it is set for the WAVE format because AIFF is not recognized by the HTML audio tag. However there is a small problem. Csound should wait until BP has finished writing the Csound score, otherwise it produces a shorter sound file based on part of the score. We can see in the trace that BP was interrupted by the running of Csound. For the time being I have put a sleep(4) instruction to keep PHP waiting for 4 seconds after sending its ccommand to the console. With 2 seconds it doesn't work, and evidently this delay will depend on the size of the score, the speed of the application etc. Therefore my suggestion is that we instruct the console to create a small file, for instance "done.txt" so that the interface waits for the file to appear, deletes it and then procedd to Csound (and to the display of images). Indeed there maybe other methods for checking that "bp" is still active but I am afraid of system dependency… I am going to try this on the current "graphics-for-BP3" is it hasn't yet been merged. ;-) Bernard |
