[Bugs] Issues with the sound object

LIJI · April 2, 2012 at 7:53 PM

While developing an application that uses advanced sound techniques, I've noticed several problems:

- The get channel/sample frequency expression is not supported despite the fact all actions related to frequency are supported
- It's impossible to play the same sample at two or more different channels at the same. The only workaround I've got to work outside of the standard Windows runtime is to use a different clone of the sample for each channel, which obviously is a dirty hack.
- It seems that once a channel volume drops below a certain threshold it's considered muted despite being above zero. It creates an ugly artifact when fading in/out samples.

Francois · April 3, 2012 at 8:21 AM

-> 1. iOS does not provide any function to get the frequency of a sample. You can change the frequency though, but it is not accurate.
-> 2. True,j I have to work on this
-> 3. This is not of my doing, and is a behavior of iOS or OpenAL

LIJI · April 3, 2012 at 5:03 PM

1. What do you mean by not accurate? It would be nice if the runtime worked around this limitation to ease porting from different runtimes, i.e. having a built in runtime array of the frequency of each channel, updating it whenever a sample starts or the frequency actions are used, and implement the get frequency expressions using this array.
2. Thanks.
3. Too bad. =/

Francois · April 4, 2012 at 7:22 AM

Not accurate means that the frequency is not exactly the same as the one you ask for... But I do my best.

cfullerNY · April 4, 2012 at 10:39 AM

thats interesting...so its possible to change the frequency of a sample at runtime, just not perfectly?

my little bird.wav can play at different pitches just from one wav file?

Francois · April 5, 2012 at 9:04 AM

Yes it is. The frequancy change is based on a frequency of 42000 Herz. If you use something higher, the pitch is increased, lower it is reduced.

Olivier · April 20, 2012 at 2:05 PM

François, is it possible to change the frequency of a channel while it is playing? I've did some tests, but I'm not sure of the result. Maybe my sound it too short, it seems that it does not work.

EDIT: Ok, it works for both MP3 and WAV files.

Olivier · April 20, 2012 at 5:39 PM

For the record, with the iOS runtime setting a channel's frequency only works AFTER having started to play a sample on the said channel. This is not the same behavior as with the PC runtime.

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