[alsa-devel] [PATCH]Support MCP89 and GT21x hdmi audio

[Jaroslav Kysela]

On Sat, 13 Mar 2010, VDR User wrote:

> [pid  9629] 1268511516.215224 ioctl(18, 0x400c4150, 0xb43631a4) = 0

^^^^ here xine feeds new samples to the ALSA driver 
(0x400c4150 == SNDRV_PCM_IOCTL_WRITEI_FRAMES)

> [pid  9629] 1268511516.215275 ioctl(18, 0x80044121, 0xb43632cc) = 0
> [pid  9627] 1268511520.700109 ioctl(10, 0xc0104652, 0xb5443f00) = 0
> [pid  9629] 1268511520.700340 ioctl(18, 0x80044121, 0xb43632cc) = -1
> EPIPE (Broken pipe)

^^^^ next iteration (0x80044121 == SNDRV_PCM_IOCTL_DELAY) - see time 
difference - 4.485 seconds from last WRITEI

It seems like a xine bug or the system scheduler bug or any kernel bug 
affecting the system scheduler. The ALSA subsystem is not reponsible for 
this behaviour - the ring buffer in your case is for about 0.372 seconds 
of samples. This limit must not be crossed for the click-free playback.

Ask the xine developers for more help or try another player.

 					Jaroslav

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Jaroslav Kysela <perex at perex.cz>
Linux Kernel Sound Maintainer
ALSA Project, Red Hat, Inc.