[pulseaudio-discuss] pulseaudio + skype = echo

[student975 at yandex.ru]

Hi! 

Please, help to resolve the issue.

Up to date Arch Linux is in use.

Skype 4.3 is announced to support pulseaudio only (alsa support is removed). 
To prepare to upcoming upgrade I have played with pulse + skype. To keep all
alsa setup (I have three cards) I have just assigned two alsa devices (dmix
and dsnoop) to pulse's sink and source

load-module module-alsa-sink device=iceDmixer
load-module module-alsa-source device=iceDsnoop

All does work as expected except for big sound delay (my side) against
video resulting also in unacceptable echo (my respondent's side). I
guess the delay is too large to be processed by skype echo cancelation.

I'm aware of delay defined in skype .desktop file, but delay duration
is hundreds ms (I guess ~500ms) rather 60ms.

It is a list of sinks at the moment of test skype call:

~ $ pacmd list-sink-inputs
2 sink input(s) available.
    index: 0
        driver: <module-combine-sink.c>
        flags: VARIABLE_RATE DONT_MOVE NO_CREATE_SUSPEND 
        state: RUNNING
        sink: 0 <alsa_output.dmix>
        volume: front-left: 65536 / 100% / 0.00 dB,   front-right: 65536 / 100% / 0.00 dB
                balance 0.00
        muted: no
        current latency: 0.00 ms
        requested latency: 200.00 ms
        sample spec: s16le 2ch 44100Hz
        channel map: front-left,front-right
                     Stereo
        resample method: trivial
        module: 11
        properties:
                media.name = "Simultaneous output on VT1720/24 [Envy24PT/HT] PCI Multi-Channel Audio Controller (Aureon 7.1 Space)"
                media.role = "filter"
                module-stream-restore.id = "sink-input-by-media-role:filter"
    index: 3
        driver: <protocol-native.c>
        flags: START_CORKED 
        state: RUNNING
        sink: 1 <combined>
        volume: front-left: 65536 / 100% / 0.00 dB,   front-right: 65536 / 100% / 0.00 dB
                balance 0.00
        muted: no
        current latency: 217.88 ms
        requested latency: 200.00 ms
        sample spec: s16le 2ch 48000Hz
        channel map: front-left,front-right
                     Stereo
        resample method: speex-float-1
        module: 8
        client: 10 <Skype>
        properties:
                window.icon_name = "skype"
                application.icon_name = "skype"
                media.role = "phone"
                media.name = "Output"
                application.name = "Skype"
                native-protocol.peer = "UNIX socket client"
                native-protocol.version = "29"
                application.process.id = "2139"
                application.process.user = "anli"
                application.process.host = "jazz"
                application.process.binary = "skype"
                application.language = "en_US.UTF-8"
                window.x11.display = ":0"
                application.process.machine_id = "07c622b729d500bbcb3a0c8d00000427"
                application.process.session_id = "c1"
                module-stream-restore.id = "sink-input-by-media-role:phone"


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