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On 05/15/2013 10:25 PM, B. Zhang wrote:
Hi,
Using mpd and kernel 3.9.2, when I switch tracks and the next
track is a different sample rate there is a fairly loud popping.
There is no noise during playback. Sometimes this happens even the
next track has the same sample rate.
I use a usb interface is M2Tech hiface2 (XMOS UAC2, http://www.m2tech.biz/hiface2.html
).
But it works with kernel 3.1.10.
It seems this is a synchronization lost problem with soft mute
DAC.
I wonder if this problem is related to usb feedback (the hiface2
is asynchronous).
With kernel 3.1.10, Feedback Format = 16.16
With kernel 3.9.2, Feedback Format = 8.16 Packet Size = 0
Maybe it's a URBs problem ?
URBs = 8 [ 8 8 8 8 8 8 8 8 ] when using 3.1.10, but not this line
with 3.9.2.
Some output :
=====================
# uname -a
Linux alarm 3.1.10-19-ARCH #1 PREEMPT Thu May 9 23:53:15 UTC 2013
armv5tel GNU/Linux
# cat /proc/asound/card0/stream0
M2Tech M2Tech USB Audio 2.0 at usb-orion-ehci.0-1, high speed :
USB Audio
Playback:
Status: Running
Interface = 1
Altset = 1
URBs = 8 [ 8 8 8 8 8 8 8 8 ]
Packet Size = 1024
Momentary freq = 192000 Hz (0x18.0000)
Feedback Format = 16.16
Interface 1
Altset 1
Format: S32_LE
Channels: 2
Endpoint: 1 OUT (ASYNC)
Rates: 44100, 48000, 88200, 96000, 176400, 192000
Data packet interval: 125 us
===========================================
# uname -a
Linux alarm 3.9.2-1-ARCH #1 PREEMPT Mon May 13 00:02:00 UTC 2013
armv5tel GNU/Linux
# cat /proc/asound/card0/stream0
M2Tech M2Tech USB Audio 2.0 at usb-orion-ehci.0-1, high speed :
USB Audio
Playback:
Status: Running
Interface = 1
Altset = 1
Packet Size = 1024
Momentary freq = 192000 Hz (0x18.0000)
Feedback Format = 8.16
Packet Size = 0
Momentary freq = 192000 Hz (0x18.0000)
Interface 1
Altset 1
Format: S32_LE
Channels: 2
Endpoint: 1 OUT (ASYNC)
Rates: 44100, 48000, 88200, 96000, 176400, 192000
===================
Thanks for your help,
Bin
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------------------------------------------------------------------------------
AlienVault Unified Security Management (USM) platform delivers complete
security visibility with the essential security capabilities. Easily and
efficiently configure, manage, and operate all of your security controls
from a single console and one unified framework. Download a free trial.
http://p.sf.net/sfu/alienvault_d2d
_______________________________________________
Alsa-user mailing list
Alsa-user@xxxxxxxxxxxxxxxxxxxxx
https://lists.sourceforge.net/lists/listinfo/alsa-user
