[Bug 660170] New: Excessive CPU Usage When Using `alsasrc ! audiorate'

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=660170
  GStreamer | gst-plugins-base | git

           Summary: Excessive CPU Usage When Using `alsasrc ! audiorate'
    Classification: Platform
           Product: GStreamer
           Version: git
        OS/Version: Linux
            Status: UNCONFIRMED
          Severity: critical
          Priority: Normal
         Component: gst-plugins-base
        AssignedTo: gstreamer-bugs at lists.freedesktop.org
        ReportedBy: bgmarete at gmail.com
         QAContact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---


Using audiorate to smooth out the stream produced by alsasrc causes excessive
CPU usage. On my machine, a Core i5 that has 2 cores and 4 hyperthreads, it
uses more than 1 hyperthread.

This pipeline trivially reproduces the problem:

gst-launch alsasrc  ! audiorate ! wavenc ! filesink location=/dev/null

Redirecting the filesink location to an actual file shows that audiorate is
producing an excessive number of samples (many thousands a second -- see the
attached log also) and will produce a multi-gigabyte file within a minuite.

Attached is a debug log generating by setting alsasrc and audiorate to debug
logging levels.

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