[pulseaudio-discuss] Problems with loading the module-echo-cancel with webrtc
Koenraad Verheyden
koenraad.verheyden at gmail.com
Mon May 8 13:22:34 UTC 2017
>
> The quotation marks are stripped already by the shell, and pactl isn't
> smart enough to automatically add quotation marks when it sees that a
> module argument was passed with a space in it. The arguments are
> concatenated into a single string that will then be parsed by the
> server, and since the string doesn't contain any quotation marks at
> that point, the server can't know that comfort_noise=1 is actually a
> part of the aec_args argument. This should work better:
>
> $ pactl load-module module-echo-cancel aec_method=webrtc
> aec_args="\"mobile=1 comfort_noise=1\""
>
Adding the extra quotation marks works thanks!
pactl doesn't ignore them, module-echo-cancel does that. It looks like
> it doesn't at least currently support manually configuring the format,
> rate and channels. You can pass use_master_format=true, though, which
> should make the filter sink and source use the master sink and source
> parameters. The webrtc canceller has some constraints of its own,
> though, which you can see in webrtc_ec_fixate_spec() in
> src/modules/echo-cancel/webrtc.cc. For example, it will force the
> sample format to be float.
You are right, webrtc is limited to 8, 16, 32 or 48 kHz. Adding rate=48000
works.
use_master_format=true does the trick for using 2 channel sources and sinks.
I now use
$ pactl load-module module-echo-cancel use_master_format=true rate=48000
Do you mean the errors at the end of the log? I don't know what causes
> it. I suspect a resync is a fairly normal thing, and shouldn't be
> logged as an error.
I added the log to show how PulseAudio processed the load-module command.
But it is fixed now with the use_master_format parameter.
Thanks for the help!
All the best,
Koenraad
On 6 May 2017 at 18:58, Tanu Kaskinen <tanuk at iki.fi> wrote:
> On Thu, 2017-05-04 at 15:35 +0200, Koenraad Verheyden wrote:
> > 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.
>
> The quotation marks are stripped already by the shell, and pactl isn't
> smart enough to automatically add quotation marks when it sees that a
> module argument was passed with a space in it. The arguments are
> concatenated into a single string that will then be parsed by the
> server, and since the string doesn't contain any quotation marks at
> that point, the server can't know that comfort_noise=1 is actually a
> part of the aec_args argument. This should work better:
>
> $ pactl load-module module-echo-cancel aec_method=webrtc
> aec_args="\"mobile=1 comfort_noise=1\""
>
> > 2) pactl load-module seems to ignore format, rate and channels arguments.
> > When I execute
>
> pactl doesn't ignore them, module-echo-cancel does that. It looks like
> it doesn't at least currently support manually configuring the format,
> rate and channels. You can pass use_master_format=true, though, which
> should make the filter sink and source use the master sink and source
> parameters. The webrtc canceller has some constraints of its own,
> though, which you can see in webrtc_ec_fixate_spec() in
> src/modules/echo-cancel/webrtc.cc. For example, it will force the
> sample format to be float.
>
> > $ 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?
>
> Do you mean the errors at the end of the log? I don't know what causes
> it. I suspect a resync is a fairly normal thing, and shouldn't be
> logged as an error. I have never used module-echo-cancel seriously, but
> often when I've loaded it to investigate some bug, I've seen the resync
> error messages too. Arun might know better.
>
> --
> Tanu
>
> https://www.patreon.com/tanuk
>
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