Bug 64017

Summary:	lag between analog and digital outputs using module-combine-sink
Product:	PulseAudio	Reporter:	asomerville52
Component:	core	Assignee:	pulseaudio-bugs
Status:	RESOLVED MOVED	QA Contact:	pulseaudio-bugs
Severity:	major
Priority:	medium	CC:	jebeld17, jjardon, lennart, myst
Version:	unspecified
Hardware:	All
OS:	Linux (All)
URL:	https://bugs.launchpad.net/ubuntu/+source/paprefs/+bug/1405449
Whiteboard:
i915 platform:		i915 features:

Description asomerville52 2013-04-28 11:19:19 UTC

Setting up simultaneous analog and digital output results in relative lag between the analog and digital outputs on my Nforce2 motherboard with onboard sound. 

This is using the example provided in the pulseaudio archlinux wiki, here:

https://wiki.archlinux.org/index.php/PulseAudio/Examples#Simultaneous_HDMI_and_Analog_Output

.. with the following "default.pa" entries:

### Load analog device
load-module module-alsa-sink device=hw:0,2
load-module module-combine-sink sink_name=combined
set-default-sink combined

I can be watching a movie on VLC and a relative delay between analog and digital outputs can develop, so that a sound will come out one set of speakers half a second after they come out the other, making movies unwatchable. A fast way to make the problem occur is to change tracks on Clementine, making use of the crossfade feature, resulting in an element of mixing. The relative lag is non-fixed and sporadic. 

This problem does not occur using a custom .asoundrc to setup simultaneous digital and analog output using ALSA without Pulseaudio.

Comment 1 Raymond 2014-02-07 22:57:31 UTC

post the output of alsa-info. sh

are your card  like the first example in your url?

aplay -l
**** List of PLAYBACK Hardware Devices ****
card 0: Intel [HDA Intel], device 0: ALC889A Analog [ALC889A Analog]
  Subdevices: 0/1
  Subdevice #0: subdevice #0
card 0: Intel [HDA Intel], device 1: ALC889A Digital [ALC889A Digital]
  Subdevices: 1/1
  Subdevice #0: subdevice #0
card 0: Intel [HDA Intel], device 3: HDMI 0 [HDMI 0]
  Subdevices: 0/1
  Subdevice #0: subdevice #0

the alsaid driver can play stereo  to both device 0 and device 1 at the same time when they are belong to same hda codec

Comment 2 Alexander E. Patrakov 2016-05-01 14:09:33 UTC

*** Bug 88703 has been marked as a duplicate of this bug. ***

Comment 3 Alexander E. Patrakov 2016-05-01 14:11:16 UTC

*** Bug 87692 has been marked as a duplicate of this bug. ***

Comment 4 Jeb Eldridge 2016-05-01 17:37:12 UTC

Added URL to bug in Launchpad.

Comment 5 Raymond 2016-05-02 02:30:05 UTC

http://git.kernel.org/cgit/linux/kernel/git/tiwai/hda-emu.git/plain/codecs/cs4206-macbook-pro-81?id=HEAD

it is possiblw that analog output has 13 samples delay but digital output has 4 sample delay for those macbook using cs4206


ode 0x02 [Audio Output] wcaps 0xd041d: Stereo Amp-Out
  Control: name="Master Playback Switch", index=0, device=0
  Control: name="Master Playback Volume", index=0, device=0
  Control: name="Headphone Playback Switch", index=0, device=0
    ControlAmp: chs=3, dir=Out, idx=0, ofs=0
  Control: name="Headphone Playback Volume", index=0, device=0
    ControlAmp: chs=3, dir=Out, idx=0, ofs=0
  Amp-Out caps: ofs=0x73, nsteps=0x7f, stepsize=0x01, mute=1
  Amp-Out vals:  [0x68 0x68]
  Converter: stream=0, channel=0
  PCM:
    rates [0x7f0]: 32000 44100 48000 88200 96000 176400 192000
    bits [0x1e]: 16 20 24 32
    formats [0x3]: PCM FLOAT
  Power states:  D0 D3 EPSS
  Power: setting=D0, actual=D0
  Delay: 13 samples



ode 0x08 [Audio Output] wcaps 0x40611: Stereo Digital
  Control: name="IEC958 Playback Con Mask", index=0, device=0
  Control: name="IEC958 Playback Pro Mask", index=0, device=0
  Control: name="IEC958 Playback Default", index=0, device=0
  Control: name="IEC958 Playback Switch", index=0, device=0
  Control: name="IEC958 Default PCM Playback Switch", index=0, device=0
  Device: name="Cirrus Digital", type="SPDIF", device=1
  Converter: stream=0, channel=0
  Digital:
  Digital category: 0x0
  IEC Coding Type: 0x0
  PCM:
    rates [0x7f0]: 32000 44100 48000 88200 96000 176400 192000
    bits [0x1e]: 16 20 24 32
    formats [0x7]: PCM FLOAT AC3
  Power states:  D0 D3 EPSS
  Power: setting=D0, actual=D0
  Delay: 4 samples

Comment 6 GitLab Migration User 2018-07-30 09:59:24 UTC

-- GitLab Migration Automatic Message --

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