Buffer underruns with PortAudioSink

[funkzy]

I modified examples/play_track.py to use PortAudio:

# Connect an audio sink
audio = spotify.PortAudioSink(session)

Every 10-20 seconds or so, I hear a blip in playback.

Details:

• OS X 10.9.2
• Macbook Pro / 2.6 ghz processor
• portaudio: stable 19.20111121, HEAD (via Homebrew)
• PyAudio: 0.2.8 (released April 2014)
• Python: 2.7.5

[jodal]

I can reproduce with:

• MacBook Air 11" mid-2011
• OS X 10.9.3
• Xcode 5.1.1
• Python 2.7.5 (from Apple) and Python 2.7.7 (from Homebrew)
• PortAudio 19.20111121, HEAD (from Homebrew)
• PyAudio 0.2.8 (from pip)

[jodal]

If someone feels up to looking at this, the problem is probably in this area:

https://github.com/mopidy/pyspotify/blob/v2.x/develop/spotify/sink.py#L149-L158

[jodal]

I can also reproduce with:

• Ubuntu 14.04 amd64
• Python 2.7.6
• PortAudio 19+svn20140130-1 from APT
• PyAudio 0.2.7-2build2 from APT

During playback, a couple of these messages was printed:

ALSA lib pcm.c:7843:(snd_pcm_recover) underrun occurred

I think it's clear we can blame the PortAudioSink implementation in pyspotify.

[funkzy]

I'm working on a fix for this.

[jodal]

Closing as libspotify and pyspotify are dead. See #215 for details.