Problem with playback on single channel

[interlocuteur]

trafficstars

I'm using pyAlsaAudio for a tone generator application. Versions are 0.8.4 for pyAlsaAudio (installed through pip) and python is 3.5. I set the following parameters:

• rate: 8KHz
• format: U8
• periodsize: 100
• channels: 1 It works but:
• there is some noise ('pop') at the beginning of the playback
• the latency is very long

I was surprised with the latency since Alsa and pyAlsaAudio are designed for low-latency. I used dumpinfo() function to diagnose and found that setchannel() to 1 generate weird settings:

• period time = 131072000 us
• period size = 1048576 frames
• buffer time = 0 us
• buffer size = 4194304 frames The buffer size probably explain the long latency.

It looks like an overflow problem or some un-initialized variable. I tried to dig into alsaaudio.c (found on github) and can't find the problem.

Note: the latency problem and the 'pop' noise do not happen when channels=2

By the way and unrelated, dumpinfo() reports 'period time' twice. I suppose the intent of the second one was to print some other variable.

[ossilator]

is this reproducible with v0.9, using the new method to parameterize the pcm object?

[ossilator]

this was presumably fixed along with #63.