pcm audio stuff for "sound stops after many hours" issue

    Channel Info for playback:
      subdevice: -1
    tsubname: SW MIX PCM
      channel: 0
      flags: 0x00000bb1
      formats: 0x0100ffff
      rates: 0x000000fe
      min_rate: 4000
      max_rate: 192000
      min_voices: 2
      max_voices: 2
      max_buffer_size: 0
      min_fragment_size: 4096
      max_fragment_size: 4096
      fragment_align: 0
      fifo_size: 0
      transfer_block_size: 0
      mixer_device: 0
    snd_pcm_plugin_setup:
      channel: 0
      mode: 1
      format.interleave: 1
      format.format: 4 (Signed 16-bit Little Endian)
      format.rate: 4000
      format.voices: 2
      buf.block.frag_size: 340
      buf.block.frags: 64
      buf.block.frags_min: 16
      buf.block.frags_max: 63
    Settings according to setup value: (Mixer Pcm Group [white noise channel])
    audio.buffer size: 340 bytes, 85 samples
    audio.fd 34