[pulseaudio-tickets] [Bug 96807] New: I can not control the latency in module-loopback

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=96807

            Bug ID: 96807
           Summary: I can not control the latency in module-loopback
           Product: PulseAudio
           Version: unspecified
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: modules
          Assignee: pulseaudio-bugs at lists.freedesktop.org
          Reporter: alessandro.ferri at icloud.com
        QA Contact: pulseaudio-bugs at lists.freedesktop.org
                CC: lennart at poettering.net

I would like to minimize the latency time between the audio input from the
Cirrus Logic Audio Card (for raspberry Pi2) and the audio output over bluetooth
speaker. I note an important time separation between my input voice on the
output on Bluetooth and I would like to minimize this time. I tried to control
the latency with the command:

pactl load-module module-loopback latency_msec=1
source="alsa_input.platform-sound.analog-stereo"
sink="bluez_sink.B8_27_EB_00_82_2D"

or

pacat -r --latency=102800 -d alsa_input.platform-sound.analog-stereo | pacat -p
--latency=102800 -d bluez_sink.B8_27_EB_00_82_2D

but it seems that the options are ignored.
Below my sink and reference source:

Sink #2
        State: SUSPENDED
        Name: bluez_sink.B8_27_EB_00_82_2D
        Description: BlueAni-00822d
        Driver: module-bluez5-device.c
        Sample Specification: s16le 2ch 44100Hz
        Channel Map: front-left,front-right
        Owner Module: 15
        Mute: no
        Volume: front-left: 65536 / 100% / 0.00 dB,   front-right: 65536 / 100%
/ 0.00 dB
                balance 0.00
        Base Volume: 65536 / 100% / 0.00 dB
        Monitor Source: bluez_sink.B8_27_EB_00_82_2D.monitor
        Latency: 0 usec, configured 0 usec
        Flags: HARDWARE DECIBEL_VOLUME LATENCY 
        Properties:
                bluetooth.protocol = "a2dp_sink"
                device.description = "BlueAni-00822d"
                device.string = "B8:27:EB:00:82:2D"
                device.api = "bluez"
                device.class = "sound"
                device.bus = "bluetooth"
                bluez.path = "/org/bluez/hci0/dev_B8_27_EB_00_82_2D"
                bluez.class = "0x0c0000"
                bluez.alias = "BlueAni-00822d"
                device.icon_name = "audio-card-bluetooth"
        Ports:
                unknown-output: Bluetooth Output (priority: 0)
        Active Port: unknown-output
        Formats:
                pcm


Source #1
        State: SUSPENDED
        Name: alsa_input.platform-sound.analog-stereo
        Description: snd_rpi_wsp Analog Stereo
        Driver: module-alsa-card.c
        Sample Specification: s16le 2ch 44100Hz
        Channel Map: front-left,front-right
        Owner Module: 1
        Mute: no
        Volume: front-left: 65536 / 100% / 0.00 dB,   front-right: 65536 / 100%
/ 0.00 dB
                balance 0.00
        Base Volume: 65536 / 100% / 0.00 dB
        Monitor of Sink: n/a
        Latency: 0 usec, configured 0 usec
        Flags: HARDWARE DECIBEL_VOLUME LATENCY 
        Properties:
                alsa.resolution_bits = "16"
                device.api = "alsa"
                device.class = "sound"
                alsa.class = "generic"
                alsa.subclass = "generic-mix"
                alsa.name = ""
                alsa.id = "WM5102 AiFi wm5102-aif1-0"
                alsa.subdevice = "0"
                alsa.subdevice_name = "subdevice #0"
                alsa.device = "0"
                alsa.card = "1"
                alsa.card_name = "snd_rpi_wsp"
                alsa.long_card_name = "snd_rpi_wsp"
                alsa.driver_name = "snd_soc_rpi_wsp"
                device.bus_path = "platform-sound"
                sysfs.path = "/devices/platform/sound/sound/card1"
                device.string = "hw:1"
                device.buffering.buffer_size = "352800"
                device.buffering.fragment_size = "58800"
                device.access_mode = "mmap+timer"
                device.profile.name = "analog-stereo"
                device.profile.description = "Analog Stereo"
                device.description = "snd_rpi_wsp Analog Stereo"
                module-udev-detect.discovered = "1"
                device.icon_name = "audio-card"
        Ports:
                analog-input: Analog Input (priority: 10000)
        Active Port: analog-input
        Formats:
                pcm


I take it for granted that the bluetooth latency output is already at zero, How
can I control this latency.

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