Re: kern/52175: audio sometimes stutters

To: gnats-bugs%netbsd.org@localhost
Subject: Re: kern/52175: audio sometimes stutters
From: Manuel Bouyer <bouyer%antioche.eu.org@localhost>
Date: Wed, 26 Apr 2017 12:03:36 +0200

On Tue, Apr 25, 2017 at 10:17:35PM +0200, Manuel Bouyer wrote:
> [...]
> Also, playing a sound from opencpn (which uses portaudio2, which uses
> ossaudio). It hangs. ktrace shows what looks like an endless loop writing
> the same 64k data block again and again (the file itself is less than 128KB,
> but larger files shows the same behavior), at a very low rate.
> I don't hear anything on output but maybe that's because the file
> is played at a very low rate.

Here is what I see with AUDIO_DEBUG=1 when opencpn opens the device to
play the file (the file is:
RIFF (little-endian) data, WAVE audio, Microsoft PCM, 16 bit, mono 22050 Hz
)

audio_open: flags=0x6 sc=0xbfaef808 hdl=0xbfd54688
audio_initbufs: mode=0x5
audio_init_ringbuffer: MI blksize=9600
audio_init_ringbuffer: final blksize=9600
audio_init_ringbuffer: MI blksize=9600
audio_init_ringbuffer: final blksize=9600
audio_init_ringbuffer: MI blksize=9600
audio_init_ringbuffer: final blksize=9600
audio_init_ringbuffer: MI blksize=9600
audio_init_ringbuffer: final blksize=9600
audiosetinfo sc=0xbfaef808 ai=0xbd1c5b20
audiosetinfo p rate 8000 p encoding 1 p precision 8 p channels 1 np 4
audiosetinfo() Setting record params: enc=1 1ch 8/8bit 8000Hz
audiosetinfo() Setting play params: enc=1 1ch 8/8bit 8000Hz
audio_setup_pfilters: HW-buffer=0xbf86e1d4 pustream=0xbf86e034
[0] enc=1 1ch 8/8bit 8000Hz
[1] enc=6 1ch 16/16bit 8000Hz
[HW] enc=6 2ch 16/16bit 48000Hz
audio_setup_rfilters: HW-buffer=0xbf86e238 pustream=0xbf86e2e4
[HW] enc=6 2ch 16/16bit 48000Hz
[0] enc=6 1ch 16/16bit 8000Hz
[1] enc=1 1ch 8/8bit 8000Hz
audiosetinfo: filter setup is completed.
audio_calc_blksize: record blksize=9600
audio_calc_blksize: play blksize=9600
audio_initbufs: mode=0x5
audio_init_ringbuffer: MI blksize=9600
audio_init_ringbuffer: final blksize=9600
audio_init_ringbuffer: MI blksize=9600
audio_init_ringbuffer: final blksize=9600
audio_calcwater: plow=49152 phigh=65536 rlow=0 rhigh=55936
audiostartp: start=0xc0f94000 used=0(hi=65536 blk=9600) mmapped=0
audiostartp: wakeup and return
audio_calcwater: plow=49152 phigh=65536 rlow=0 rhigh=55936
audio_open: done sc_mode = 0x5
audio_ioctl(4,'f',126)
audio_ioctl(4,'f',126) result 0
audio_ioctl(32,'A',28)
AUDIO_GETENC
audio_ioctl(32,'A',28) result 0
audio_ioctl(32,'A',28)
AUDIO_GETENC
audio_ioctl(32,'A',28) result 0
audio_ioctl(32,'A',28)
AUDIO_GETENC
audio_ioctl(32,'A',28) result 0
audio_ioctl(32,'A',28)
AUDIO_GETENC
audio_ioctl(32,'A',28) result 0
audio_ioctl(32,'A',28)
AUDIO_GETENC
audio_ioctl(32,'A',28) result 0
audio_ioctl(32,'A',28)
AUDIO_GETENC
audio_ioctl(32,'A',28) result 0
audio_ioctl(32,'A',28)
AUDIO_GETENC
audio_ioctl(32,'A',28) result 22
audio_ioctl(136,'A',22)
AUDIO_SETINFO mode=0x5
audiosetinfo sc=0xbfaef808 ai=0xba310838
audiosetinfo np 0
audio_ioctl(136,'A',22) result 0
audio_ioctl(136,'A',35)
AUDIO_GETBUFINFO
audio_ioctl(136,'A',35) result 0
audio_ioctl(136,'A',22)
AUDIO_SETINFO mode=0x5
audiosetinfo sc=0xbfaef808 ai=0xba310838
audiosetinfo p encoding 6 p precision 16 np 2
audiosetinfo() Setting record params: enc=6 1ch 16/16bit 8000Hz
audiosetinfo() Setting play params: enc=6 1ch 16/16bit 8000Hz
audio_setup_pfilters: HW-buffer=0xbf86e1d4 pustream=0xbf86e034
[0] enc=6 1ch 16/16bit 8000Hz
[HW] enc=6 2ch 16/16bit 48000Hz
audio_setup_rfilters: HW-buffer=0xbf86e238 pustream=0xbf86e2b4
[HW] enc=6 2ch 16/16bit 48000Hz
[0] enc=6 1ch 16/16bit 8000Hz
audiosetinfo: filter setup is completed.
audio_calc_blksize: record blksize=9600
audio_calc_blksize: play blksize=9600
audio_initbufs: mode=0x5
audio_init_ringbuffer: MI blksize=9600
audio_init_ringbuffer: final blksize=9600
audio_init_ringbuffer: MI blksize=9600
audio_init_ringbuffer: final blksize=9600
audio_calcwater: plow=49152 phigh=65536 rlow=0 rhigh=55936
audio_ioctl(136,'A',22) result 0
audio_ioctl(136,'A',35)
AUDIO_GETBUFINFO
audio_ioctl(136,'A',35) result 0
audio_ioctl(136,'A',22)
AUDIO_SETINFO mode=0x5
audiosetinfo sc=0xbfaef808 ai=0xba310838
audiosetinfo p channels 1 np 1
audiosetinfo() Setting play params: enc=6 1ch 16/16bit 8000Hz
audio_setup_pfilters: HW-buffer=0xbf86e1d4 pustream=0xbf86e034
[0] enc=6 1ch 16/16bit 8000Hz
[HW] enc=6 2ch 16/16bit 48000Hz
audiosetinfo: filter setup is completed.
audio_calc_blksize: record blksize=9600
audio_calc_blksize: play blksize=9600
audio_initbufs: mode=0x5
audio_init_ringbuffer: MI blksize=9600
audio_init_ringbuffer: final blksize=9600
audio_init_ringbuffer: MI blksize=9600
audio_init_ringbuffer: final blksize=9600
audio_ioctl(136,'A',22) result 0
audio_ioctl(136,'A',22)
AUDIO_SETINFO mode=0x5
audiosetinfo sc=0xbfaef808 ai=0xba310838
audiosetinfo np 0
audiosetinfo() Setting record params: enc=6 1ch 16/16bit 8000Hz
audio_setup_rfilters: HW-buffer=0xbf86e238 pustream=0xbf86e2b4
[HW] enc=6 2ch 16/16bit 48000Hz
[0] enc=6 1ch 16/16bit 8000Hz
audiosetinfo: filter setup is completed.
audio_calc_blksize: record blksize=9600
audio_calc_blksize: play blksize=9600
audio_initbufs: mode=0x5
audio_init_ringbuffer: MI blksize=9600
audio_init_ringbuffer: final blksize=9600
audio_init_ringbuffer: MI blksize=9600
audio_init_ringbuffer: final blksize=9600
audio_ioctl(136,'A',22) result 0
audio_ioctl(136,'A',35)
AUDIO_GETBUFINFO
audio_ioctl(136,'A',35) result 0
audio_ioctl(136,'A',22)
AUDIO_SETINFO mode=0x5
audiosetinfo sc=0xbfaef808 ai=0xba310838
audiosetinfo p rate 22050 np 1
audiosetinfo() Setting record params: enc=6 1ch 16/16bit 22050Hz
audiosetinfo() Setting play params: enc=6 1ch 16/16bit 22050Hz
audio_setup_pfilters: HW-buffer=0xbf86e1d4 pustream=0xbf86e034
[0] enc=6 1ch 16/16bit 22050Hz
[HW] enc=6 2ch 16/16bit 48000Hz
audio_setup_rfilters: HW-buffer=0xbf86e238 pustream=0xbf86e2b4
[HW] enc=6 2ch 16/16bit 48000Hz
[0] enc=6 1ch 16/16bit 22050Hz
audiosetinfo: filter setup is completed.
audio_calc_blksize: record blksize=9600
audio_calc_blksize: play blksize=9600
audio_initbufs: mode=0x5
audio_init_ringbuffer: MI blksize=9600
audio_init_ringbuffer: final blksize=9600
audio_init_ringbuffer: MI blksize=9600
audio_init_ringbuffer: final blksize=9600
audio_ioctl(136,'A',22) result 0
audio_ioctl(136,'A',35)
AUDIO_GETBUFINFO
audio_ioctl(136,'A',35) result 0
audio_ioctl(136,'A',35)
AUDIO_GETBUFINFO
audio_ioctl(136,'A',35) result 0
audio_ioctl(136,'A',22)
AUDIO_SETINFO mode=0x5
audiosetinfo sc=0xbfaef808 ai=0xba310838
audiosetinfo np 0
audio_ioctl(136,'A',22) result 0
audio_ioctl(136,'A',35)
AUDIO_GETBUFINFO
audio_ioctl(136,'A',35) result 0
audio_ioctl(136,'A',35)
AUDIO_GETBUFINFO
audio_ioctl(136,'A',35) result 0
audio_ioctl(136,'A',22)
AUDIO_SETINFO mode=0x5
audiosetinfo sc=0xbfaef808 ai=0xba310838
audiosetinfo np 0
audio_ioctl(136,'A',22) result 0
audio_ioctl(136,'A',35)
AUDIO_GETBUFINFO
audio_ioctl(136,'A',35) result 0
audio_ioctl(4,'f',126)
audio_ioctl(4,'f',126) result 0
audiostartp: start=0xc0f94000 used=19200(hi=65536 blk=9600) mmapped=0
mix_write: call trigger_output

-- 
Manuel Bouyer <bouyer%antioche.eu.org@localhost>
     NetBSD: 26 ans d'experience feront toujours la difference
--

References:
- kern/52175: audio sometimes stutters
  - From: martin
- Re: kern/52175: audio sometimes stutters
  - From: Manuel Bouyer

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