[pulseaudio-discuss] Problems with loading the module-echo-cancel with webrtc

[Koenraad Verheyden]

Hey all,

I'm using the module-echo-cancel using webrtc. I'm having two problems
loading the module:

1) I can't figure out how to pass multiple aec_args. When I do

$ pactl load-module module-echo-cancel aec_method=webrtc aec_args="mobile=1
comfort_noise=1"

I get the following logs:

E: [pulseaudio] module-echo-cancel.c: Failed to parse module arguments.
E: [pulseaudio] module.c: Failed to load module "module-echo-cancel"
(argument:"aec_method=webrtc aec_args=mobile=1 comfort_noise=1"):
initialization failed.

It seems pactl strips away the quotation marks around the arguments? Both
arguments are recognized if I only supply them separately, so I know they
are correct.


2) pactl load-module seems to ignore format, rate and channels arguments.
When I execute

$ pactl load-module module-echo-cancel aec_method=webrtc
source_name=echo_cancel_source sink_name=echo_cancel_sink format=s16le
rate=44100 channels=2

The module loads successfully. But when I check the sinks and sources, my
sources are not stereo or 44,1 kHz.
The sample rate isn't really an issue, but I have to use stereo AEC.

4    echo_cancel_source    module-echo-cancel.c    float32le 2ch 32000Hz
SUSPENDED
5    echo_cancel_sink.monitor    module-echo-cancel.c    float32le 1ch
32000Hz    SUSPENDED

2    echo_cancel_sink    module-echo-cancel.c    float32le 1ch 32000Hz
SUSPENDED

And I get the following log:

I: [pulseaudio] module-echo-cancel.c: Using AEC engine: webrtc
I: [pulseaudio] module-echo-cancel.c: Sample rates of play and out stream
differ. Adjusting rate of play stream.
I: [pulseaudio] source.c: Created source 4 "echo_cancel_source" with sample
spec float32le 2ch 32000Hz and channel map front-left,front-right
I: [pulseaudio] source.c:     device.master_device =
"alsa_input.usb-Burr-Brown_from_TI_USB_Audio_CODEC-00.analog-stereo"
I: [pulseaudio] source.c:     device.class = "filter"
I: [pulseaudio] source.c:     device.intended_roles = "phone"
I: [pulseaudio] source.c:     device.description = "USB Audio CODEC  Analog
Stereo (echo cancelled with USB Audio CODEC  Analog Stereo)"
I: [pulseaudio] source.c:     device.icon_name = "audio-input-microphone"
I: [pulseaudio] sink.c: Created sink 2 "echo_cancel_sink" with sample spec
float32le 1ch 32000Hz and channel map mono
I: [pulseaudio] sink.c:     device.master_device =
"alsa_output.usb-Burr-Brown_from_TI_USB_Audio_CODEC-00.analog-stereo"
I: [pulseaudio] sink.c:     device.class = "filter"
I: [pulseaudio] sink.c:     device.intended_roles = "phone"
I: [pulseaudio] sink.c:     device.description = "USB Audio CODEC  Analog
Stereo (echo cancelled with USB Audio CODEC  Analog Stereo)"
I: [pulseaudio] sink.c:     device.icon_name = "audio-card"
I: [pulseaudio] source.c: Created source 5 "echo_cancel_sink.monitor" with
sample spec float32le 1ch 32000Hz and channel map mono
I: [pulseaudio] source.c:     device.description = "Monitor of USB Audio
CODEC  Analog Stereo (echo cancelled with USB Audio CODEC  Analog Stereo)"
I: [pulseaudio] source.c:     device.class = "monitor"
I: [pulseaudio] source.c:     device.icon_name = "audio-input-microphone"
I: [pulseaudio] source-output.c: Trying to change sample rate
I: [pulseaudio] alsa-source.c: Updating rate for device front:1, new rate
is 48000
I: [pulseaudio] source.c: Changed sampling rate successfully
I: [pulseaudio] source-output.c: Rate changed to 48000 Hz
I: [alsa-source-USB Audio] alsa-source.c: Trying resume...
I: [alsa-source-USB Audio] alsa-source.c: Resumed successfully...
I: [alsa-source-USB Audio] alsa-source.c: Starting capture.
I: [pulseaudio] source-output.c: Created output 1 "Echo-Cancel Source
Stream" on
alsa_input.usb-Burr-Brown_from_TI_USB_Audio_CODEC-00.analog-stereo with
sample spec float32le 2ch 32000Hz and channel map front-left,front-right
I: [pulseaudio] source-output.c:     media.name = "Echo-Cancel Source
Stream"
I: [pulseaudio] source-output.c:     media.role = "filter"
I: [pulseaudio] source-output.c:     module-stream-restore.id =
"source-output-by-media-role:filter"
I: [alsa-sink-USB Audio] alsa-sink.c: Trying resume...
I: [alsa-sink-USB Audio] alsa-sink.c: Resumed successfully...
I: [alsa-sink-USB Audio] alsa-sink.c: Starting playback.
I: [pulseaudio] resampler.c: Resampler 'ffmpeg' cannot do variable rate,
reverting to resampler 'auto'.
I: [pulseaudio] remap_neon.c: Using ARM NEON mono to stereo remapping
I: [pulseaudio] speex.c: Choosing speex quality setting 1.
I: [pulseaudio] sink-input.c: Created input 2 "Echo-Cancel Sink Stream" on
alsa_output.usb-Burr-Brown_from_TI_USB_Audio_CODEC-00.analog-stereo with
sample spec float32le 1ch 32000Hz and channel map mono
I: [pulseaudio] sink-input.c:     media.name = "Echo-Cancel Sink Stream"
I: [pulseaudio] sink-input.c:     media.role = "filter"
I: [pulseaudio] sink-input.c:     module-stream-restore.id =
"sink-input-by-media-role:filter"
I: [pulseaudio] module.c: Loaded "module-echo-cancel" (index: #19;
argument: "aec_method=webrtc source_name=echo_cancel_source
sink_name=echo_cancel_sink format=s16le rate=44100 channels=2").
E: [alsa-source-USB Audio] module-echo-cancel.c: Doing resync
E: [alsa-source-USB Audio] module-echo-cancel.c: Playback too far ahead
(96683), drop source 24744

Do you have any idea what causes this?

All the best,
Koenraad
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