<div dir="ltr">I'm having trouble getting the echo-cancel module working. I'm running pulseaudio 15.0 on an i.MX8QM arm embedded system, and trying to do echo-cancel between the speakers and the mic to act as bluetooth speakerphone. For testing I am playing music through the echo-canceled speaker sink and running parecord on the echo-canceled mic source. I can do either of those independently and it works. However, when I start parecord while playing through speakers, pulseaudio goes to 100% CPU and journalctl shows the error "Resume failed, couldn't restore original sample settings." streaming over and over. Tried with aec_method=null for test purposes and got the same result.<div> </div><div>verbose log:</div><div>Aug 19 14:02:36 apalis-vhu2 pulseaudio[478]: Protocol version: remote 35, local 35 Aug 19 14:02:36 apalis-vhu2 pulseaudio[478]: Got credentials: uid=0 gid=0 success=1 Aug 19 14:02:36 apalis-vhu2 pulseaudio[478]: SHM possible: no Aug 19 14:02:36 apalis-vhu2 pulseaudio[478]: Negotiated SHM: no Aug 19 14:02:36 apalis-vhu2 pulseaudio[478]: Disabling srbchannel, reason: No SHM support Aug 19 14:02:36 apalis-vhu2 pulseaudio[478]: Negotiated format: pcm, format.sample_format = "\"s16le\"" format.rate = "44100" format.channels = "2" format.channel_map = "\"front-left,front-right\"" Aug 19 14:02:36 apalis-vhu2 pulseaudio[478]: Trying to change sample spec Aug 19 14:02:36 apalis-vhu2 pulseaudio[478]: Source alsa_input.platform-sound.stereo-fallback.echo-cancel becomes busy, resuming. Aug 19 14:02:36 apalis-vhu2 pulseaudio[478]: alsa_input.platform-sound.stereo-fallback.echo-cancel: suspend_cause: IDLE -> (none) Aug 19 14:02:36 apalis-vhu2 pulseaudio[478]: alsa_input.platform-sound.stereo-fallback.echo-cancel: state: SUSPENDED -> IDLE Aug 19 14:02:36 apalis-vhu2 pulseaudio[478]: Source alsa_input.platform-sound.stereo-fallback.echo-cancel becomes idle, timeout in 5 seconds. Aug 19 14:02:36 apalis-vhu2 pulseaudio[478]: Source alsa_input.platform-sound.stereo-fallback.echo-cancel becomes idle, timeout in 5 seconds. Aug 19 14:02:36 apalis-vhu2 pulseaudio[478]: Resampler: Aug 19 14:02:36 apalis-vhu2 pulseaudio[478]: rate 32000 -> 44100 (method speex-float-1) Aug 19 14:02:36 apalis-vhu2 pulseaudio[478]: format s16le -> s16le (intermediate float32le) Aug 19 14:02:36 apalis-vhu2 pulseaudio[478]: channels 1 -> 2 (resampling 1) Aug 19 14:02:36 apalis-vhu2 pulseaudio[478]: Channel matrix: Aug 19 14:02:36 apalis-vhu2 pulseaudio[478]: I00 Aug 19 14:02:36 apalis-vhu2 pulseaudio[478]: +------ Aug 19 14:02:36 apalis-vhu2 pulseaudio[478]: O00 | 1.000 Aug 19 14:02:36 apalis-vhu2 pulseaudio[478]: O01 | 1.000 Aug 19 14:02:36 apalis-vhu2 pulseaudio[478]: Using mono to stereo remapping Aug 19 14:02:36 apalis-vhu2 pulseaudio[478]: Choosing speex quality setting 1. Aug 19 14:02:36 apalis-vhu2 pulseaudio[478]: memblockq requested: maxlength=33554432, tlength=0, base=2, prebuf=0, minreq=1 maxrewind=0 Aug 19 14:02:36 apalis-vhu2 pulseaudio[478]: memblockq sanitized: maxlength=33554432, tlength=33554432, base=2, prebuf=0, minreq=2 maxrewind=0 Aug 19 14:02:36 apalis-vhu2 pulseaudio[478]: Created output 3 "test.wav" on alsa_input.platform-sound.stereo-fallback.echo-cancel with sample spec s16le 2ch 44100Hz and channel map front-left,front-right Aug 19 14:02:36 apalis-vhu2 pulseaudio[478]: media.format = "WAV (Microsoft)" Aug 19 14:02:36 apalis-vhu2 pulseaudio[478]: <a href="http://application.name">application.name</a> = "parecord" Aug 19 14:02:36 apalis-vhu2 pulseaudio[478]: <a href="http://media.name">media.name</a> = "test.wav" Aug 19 14:02:36 apalis-vhu2 pulseaudio[478]: native-protocol.peer = "UNIX socket client" Aug 19 14:02:36 apalis-vhu2 pulseaudio[478]: native-protocol.version = "35" Aug 19 14:02:36 apalis-vhu2 pulseaudio[478]: <a href="http://application.process.id">application.process.id</a> = "5312" Aug 19 14:02:36 apalis-vhu2 pulseaudio[478]: application.process.user = "root" Aug 19 14:02:36 apalis-vhu2 pulseaudio[478]: application.process.host = "apalis-vhu2" Aug 19 14:02:36 apalis-vhu2 pulseaudio[478]: application.process.binary = "pacat" Aug 19 14:02:36 apalis-vhu2 pulseaudio[478]: application.language = "C" Aug 19 14:02:36 apalis-vhu2 pulseaudio[478]: application.process.machine_id = "2911e8d3e385480c9ac3ff9c742569a4" Aug 19 14:02:36 apalis-vhu2 pulseaudio[478]: application.process.session_id = "c4" Aug 19 14:02:36 apalis-vhu2 pulseaudio[478]: <a href="http://module-stream-restore.id">module-stream-restore.id</a> = "source-output-by-application-name:parecord" Aug 19 14:02:36 apalis-vhu2 pulseaudio[478]: memblockq requested: maxlength=4194304, tlength=0, base=4, prebuf=1, minreq=0 maxrewind=0 Aug 19 14:02:36 apalis-vhu2 pulseaudio[478]: memblockq sanitized: maxlength=4194304, tlength=4194304, base=4, prebuf=4, minreq=4 maxrewind=0 Aug 19 14:02:36 apalis-vhu2 pulseaudio[478]: Final latency 2000.00 ms = 2000.00 ms + 0.00 ms Aug 19 14:02:36 apalis-vhu2 pulseaudio[478]: Suspending source alsa_input.platform-sound.stereo-fallback due to changing format, desired format = s16le rate = 48000 Aug 19 14:02:36 apalis-vhu2 pulseaudio[478]: alsa_input.platform-sound.stereo-fallback: suspend_cause: IDLE -> IDLE|INTERNAL Aug 19 14:02:36 apalis-vhu2 pulseaudio[478]: Source does not support sample rate of 48000, set it to a verfied value Aug 19 14:02:36 apalis-vhu2 pulseaudio[478]: Reconfigured successfully Aug 19 14:02:36 apalis-vhu2 pulseaudio[478]: alsa_input.platform-sound.stereo-fallback: suspend_cause: IDLE|INTERNAL -> IDLE Aug 19 14:02:36 apalis-vhu2 pulseaudio[478]: Source output 0 state 1 Aug 19 14:02:36 apalis-vhu2 pulseaudio[478]: Source alsa_input.platform-sound.stereo-fallback becomes busy, resuming. Aug 19 14:02:36 apalis-vhu2 pulseaudio[478]: Trying resume... Aug 19 14:02:36 apalis-vhu2 pulseaudio[478]: Disabling tsched mode since BATCH flag is set Aug 19 14:02:36 apalis-vhu2 pulseaudio[478]: Maximum hw buffer size is 341 ms Aug 19 14:02:36 apalis-vhu2 pulseaudio[478]: Set buffer size first (to 4806 samples), period size second (to 1201 samples). Aug 19 14:02:36 apalis-vhu2 pulseaudio[478]: Device hw:0 doesn't support 44100 Hz, changed to 48000 Hz. Aug 19 14:02:36 apalis-vhu2 pulseaudio[478]: Resume failed, couldn't restore original sample settings. Aug 19 14:02:36 apalis-vhu2 pulseaudio[478]: alsa_input.platform-sound.stereo-fallback: suspend_cause: IDLE -> (none) Aug 19 14:02:36 apalis-vhu2 pulseaudio[478]: alsa_input.platform-sound.stereo-fallback.echo-cancel: state: IDLE -> RUNNING Aug 19 14:02:36 apalis-vhu2 pulseaudio[478]: Dropped redundant event due to change event. Aug 19 14:02:36 apalis-vhu2 pulseaudio[478]: /dev/snd/controlC0 is accessible: yes Aug 19 14:02:36 apalis-vhu2 pulseaudio[478]: Resuming all sinks and sources of card alsa_card.platform-sound. Aug 19 14:02:36 apalis-vhu2 pulseaudio[478]: Trying resume... Aug 19 14:02:36 apalis-vhu2 pulseaudio[478]: Disabling tsched mode since BATCH flag is set Aug 19 14:02:36 apalis-vhu2 pulseaudio[478]: Maximum hw buffer size is 341 ms Aug 19 14:02:36 apalis-vhu2 pulseaudio[478]: Set buffer size first (to 4806 samples), period size second (to 1201 samples). Aug 19 14:02:36 apalis-vhu2 pulseaudio[478]: Device hw:0 doesn't support 44100 Hz, changed to 48000 Hz. Aug 19 14:02:36 apalis-vhu2 pulseaudio[478]: Resume failed, couldn't restore original sample settings. Aug 19 14:02:36 apalis-vhu2 pulseaudio[478]: /dev/snd/controlC0 is accessible: yes Aug 19 14:02:36 apalis-vhu2 pulseaudio[478]: Resuming all sinks and sources of card alsa_card.platform-sound. Aug 19 14:02:36 apalis-vhu2 pulseaudio[478]: Trying resume... Aug 19 14:02:36 apalis-vhu2 pulseaudio[478]: Disabling tsched mode since BATCH flag is set Aug 19 14:02:36 apalis-vhu2 pulseaudio[478]: Maximum hw buffer size is 341 ms Aug 19 14:02:36 apalis-vhu2 pulseaudio[478]: Set buffer size first (to 4806 samples), period size second (to 1201 samples). Aug 19 14:02:36 apalis-vhu2 pulseaudio[478]: Device hw:0 doesn't support 44100 Hz, changed to 48000 Hz. Aug 19 14:02:36 apalis-vhu2 pulseaudio[478]: Resume failed, couldn't restore original sample settings. Aug 19 14:02:36 apalis-vhu2 pulseaudio[478]: /dev/snd/controlC0 is accessible: yes Aug 19 14:02:36 apalis-vhu2 pulseaudio[478]: Resuming all sinks and sources of card alsa_card.platform-sound. Aug 19 14:02:36 apalis-vhu2 pulseaudio[478]: Trying resume... Aug 19 14:02:36 apalis-vhu2 pulseaudio[478]: Disabling tsched mode since BATCH flag is set Aug 19 14:02:36 apalis-vhu2 pulseaudio[478]: Maximum hw buffer size is 341 ms Aug 19 14:02:36 apalis-vhu2 pulseaudio[478]: Set buffer size first (to 4806 samples), period size second (to 1201 samples). Aug 19 14:02:36 apalis-vhu2 pulseaudio[478]: Device hw:0 doesn't support 44100 Hz, changed to 48000 Hz. Aug 19 14:02:36 apalis-vhu2 pulseaudio[478]: Resume failed, couldn't restore original sample settings. Aug 19 14:02:36 apalis-vhu2 pulseaudio[478]: /dev/snd/controlC0 is accessible: yes Aug 19 14:02:36 apalis-vhu2 pulseaudio[478]: Resuming all sinks and sources of card alsa_card.platform-sound. Aug 19 14:02:36 apalis-vhu2 pulseaudio[478]: Trying resume... Aug 19 14:02:36 apalis-vhu2 pulseaudio[478]: Disabling tsched mode since BATCH flag is set Aug 19 14:02:36 apalis-vhu2 pulseaudio[478]: Maximum hw buffer size is 341 ms Aug 19 14:02:36 apalis-vhu2 pulseaudio[478]: Set buffer size first (to 4806 samples), period size second (to 1201 samples). Aug 19 14:02:36 apalis-vhu2 pulseaudio[478]: Device hw:0 doesn't support 44100 Hz, changed to 48000 Hz. Aug 19 14:02:36 apalis-vhu2 pulseaudio[478]: Resume failed, couldn't restore original sample settings. sinks: Sink #0 State: RUNNING Name: alsa_output.platform-sound.stereo-fallback Description: Built-in Audio Stereo Driver: module-alsa-card.c Sample Specification: s16le 2ch 48000Hz Channel Map: front-left,front-right Owner Module: 5 Mute: no Volume: front-left: 47104 / 72%, front-right: 47104 / 72% balance 0.00 Base Volume: 65536 / 100% Monitor Source: alsa_output.platform-sound.stereo-fallback.monitor Latency: 91620 usec, configured 100136 usec Flags: HARDWARE HW_VOLUME_CTRL LATENCY Properties: alsa.resolution_bits = "16" device.api = "alsa" device.class = "sound" alsa.class = "generic" alsa.subclass = "generic-mix" <a href="http://alsa.name">alsa.name</a> = "" <a href="http://alsa.id">alsa.id</a> = "59050000.sai-sgtl5000 sgtl5000-0" alsa.subdevice = "0" alsa.subdevice_name = "subdevice #0" alsa.device = "0" alsa.card = "0" alsa.card_name = "apalis-imx8qm-sgtl5000" alsa.long_card_name = "apalis-imx8qm-sgtl5000" device.bus_path = "platform-sound" sysfs.path = "/devices/platform/sound/sound/card0" device.form_factor = "internal" device.string = "hw:0" device.buffering.buffer_size = "17664" device.buffering.fragment_size = "4416" device.access_mode = "mmap" <a href="http://device.profile.name">device.profile.name</a> = "stereo-fallback" device.profile.description = "Stereo" device.description = "Built-in Audio Stereo" module-udev-detect.discovered = "1" device.icon_name = "audio-card" Ports: analog-output: Analog Output (type: Analog, priority: 9900, availability unknown) analog-output-headphones: Headphones (type: Headphones, priority: 9900, availability unknown) Active Port: analog-output Formats: pcm Sink #3 State: RUNNING Name: alsa_output.platform-sound.stereo-fallback.echo-cancel Description: Built-in Audio Stereo (echo cancelled with Built-in Audio Stereo) Driver: module-echo-cancel.c Sample Specification: s16le 1ch 32000Hz Channel Map: mono Owner Module: 17 Mute: no Volume: mono: 47104 / 72% balance 0.00 Base Volume: 65536 / 100% Monitor Source: alsa_output.platform-sound.stereo-fallback.echo-cancel.monitor Latency: 91895 usec, configured 100136 usec Flags: HW_MUTE_CTRL LATENCY Properties: device.master_device = "alsa_output.platform-sound.stereo-fallback" device.class = "filter" device.intended_roles = "phone" device.description = "Built-in Audio Stereo (echo cancelled with Built-in Audio Stereo)" device.icon_name = "audio-card" Formats: pcm sources: Source #1 State: SUSPENDED Name: alsa_input.platform-sound.stereo-fallback Description: Built-in Audio Stereo Driver: module-alsa-card.c Sample Specification: s16le 2ch 44100Hz Channel Map: front-left,front-right Owner Module: 5 Mute: no Volume: front-left: 21845 / 33%, front-right: 21845 / 33% balance 0.00 Base Volume: 65536 / 100% Monitor of Sink: n/a Latency: 0 usec, configured 0 usec Flags: HARDWARE HW_MUTE_CTRL HW_VOLUME_CTRL LATENCY Properties: alsa.resolution_bits = "16" device.api = "alsa" device.class = "sound" alsa.class = "generic" alsa.subclass = "generic-mix" <a href="http://alsa.name">alsa.name</a> = "" <a href="http://alsa.id">alsa.id</a> = "59050000.sai-sgtl5000 sgtl5000-0" alsa.subdevice = "0" alsa.subdevice_name = "subdevice #0" alsa.device = "0" alsa.card = "0" alsa.card_name = "apalis-imx8qm-sgtl5000" alsa.long_card_name = "apalis-imx8qm-sgtl5000" device.bus_path = "platform-sound" sysfs.path = "/devices/platform/sound/sound/card0" device.form_factor = "internal" device.string = "hw:0" device.buffering.buffer_size = "17664" device.buffering.fragment_size = "4416" device.access_mode = "mmap" <a href="http://device.profile.name">device.profile.name</a> = "stereo-fallback" device.profile.description = "Stereo" device.description = "Built-in Audio Stereo" module-udev-detect.discovered = "1" device.icon_name = "audio-card" Ports: analog-input-mic: Microphone (type: Mic, priority: 8700, availability unknown) Active Port: analog-input-mic Formats: pcm Source #4 State: SUSPENDED Name: alsa_input.platform-sound.stereo-fallback.echo-cancel Description: Built-in Audio Stereo (echo cancelled with Built-in Audio Stereo) Driver: module-echo-cancel.c Sample Specification: s16le 1ch 32000Hz Channel Map: mono Owner Module: 17 Mute: no Volume: mono: 21845 / 33% balance 0.00 Base Volume: 65536 / 100% Monitor of Sink: n/a Latency: 0 usec, configured 0 usec Flags: HW_MUTE_CTRL LATENCY Properties: device.master_device = "alsa_input.platform-sound.stereo-fallback" device.class = "filter" device.intended_roles = "phone" device.description = "Built-in Audio Stereo (echo cancelled with Built-in Audio Stereo)" device.icon_name = "audio-input-microphone" Formats: pcm <div> </div><div> <div>Thanks,</div>-- <div dir="ltr" class="gmail_signature" data-smartmail="gmail_signature"><div style="font-size:small"> — Aaron Brice | <a href="mailto:aaron.brice@nikolamotor.com" style="color:#a5a5a5;text-decoration:none" 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