[noleti]

Hi all, I'm planning to write an application with some stronger requirements on the timing of the playback of simple pcm wav files. To get started I wrote some JavaME code, but I'm seeing a huge (at least for my application) delay between actually starting the playback and hearing the signal. With huge I mean 100ms in this case. I have similar problems with recording - I would need to know exactly when the recording starts.
As the final application will not be too complicated I could rewrite this in C++, has anyone experience with latencies in this case?

Thanks for any comments on this!

Ole

[Nokia Ron]

I moved this to the Java Media forum to see if they can help.

Ron

[noleti]

I don't think the move was needed, but anyways:

I finally have the Symbian C++ setup running and made some tests: I used the AudioStream Example from Nokia and played around with the sounds to be played. The default setting in this example is to play 40960 bytes as 16bit @8kHz. I changed the frequency to 48kHz to match my audio samples. Then I played these samples (e.g. pure sine etc.) All measurements are done on a E61i which has dual ARM9@200MHz

I saw 2 problems:
-although the playback should take 40960/(2*48) ms=426,667 ms, I only hear ~250ms of it with my recording PC. The beginning is played, but not the last stuff in the stream.
- This is supported by the MaoscPlayComplete function being called ~380ms after the initial open() of the stream - less then the estimated playback time of ~420ms.

Am I missing something here? Is this the behaviour to expect?