Hi,
On the librem5 phone I'm having problems getting the audio routed from
the modem to the codec.
The modem source is displaying a couple of odd behaviours. Here are the
modem sources
index: 0
name: <alsa_output.platform-sound-wwan.stereo-fallback.monitor>
driver: <module-alsa-card.c>
flags: DECIBEL_VOLUME LATENCY
state: SUSPENDED
suspend cause: IDLE
priority: 1000
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
volume steps: 65537
muted: no
current latency: 0.00 ms
max rewind: 0 KiB
sample spec: s16le 2ch 48000Hz
channel map: front-left,front-right
Stereo
used by: 0
linked by: 0
fixed latency: 100.00 ms
monitor_of: 0
card: 0 <alsa_card.platform-sound-wwan>
module: 6
properties:
device.description = "Monitor of Built-in Audio Stereo"
device.class = "monitor"
alsa.card = "0"
alsa.card_name = "MODEM"
alsa.long_card_name = "MODEM"
device.bus_path = "platform-sound-wwan"
sysfs.path = "/devices/platform/sound-wwan/sound/card0"
device.form_factor = "internal"
device.string = "0"
module-udev-detect.discovered = "1"
device.icon_name = "audio-card"
index: 1
name: <alsa_input.platform-sound-wwan.stereo-fallback>
driver: <module-alsa-card.c>
flags: HARDWARE DECIBEL_VOLUME LATENCY
state: SUSPENDED
suspend cause: IDLE
priority: 9000
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
volume steps: 65537
muted: no
current latency: 0.00 ms
max rewind: 0 KiB
sample spec: s16le 2ch 48000Hz
channel map: front-left,front-right
Stereo
used by: 0
linked by: 1
fixed latency: 100.00 ms
card: 0 <alsa_card.platform-sound-wwan>
module: 6
properties:
alsa.resolution_bits = "16"
device.api = "alsa"
device.class = "sound"
alsa.class = "generic"
alsa.subclass = "generic-mix"
alsa.name = ""
alsa.id = "30030000.sai-gtm601 gtm601-0"
alsa.subdevice = "0"
alsa.subdevice_name = "subdevice #0"
alsa.device = "0"
alsa.card = "0"
alsa.card_name = "MODEM"
alsa.long_card_name = "MODEM"
device.bus_path = "platform-sound-wwan"
sysfs.path = "/devices/platform/sound-wwan/sound/card0"
device.form_factor = "internal"
device.string = "hw:0"
device.buffering.buffer_size = "19200"
device.buffering.fragment_size = "4800"
device.access_mode = "mmap"
device.profile.name = "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: Analog Input (priority 10000, latency
offset 0 usec, available: unknown)
properties:
active port: <analog-input>
If I use parecord to record from alsa_card.platform-sound-wwan I get the
audio from the modem.
If I use parecord to record from
alsa_output.platform-sound-wwan.stereo-fallback.monitor I don't get any
audio from the call until it disconnects.
Our application is grabbing the first source from alsa.card_name =
"MODEM" and is showing the same behaviour as parecord.
Is there a way to disable the monitor source or possibly reorder the
sources ?
I tried remapping the source and sink but I can't record from that
either.
load-module module-remap-source source_name=Modem
master=alsa_input.platform-sound-wwan.stereo-fallback
load-module module-remap-sink sink_name=Modem
master=alsa_output.platform-sound-wwan.stereo-fallback
The modem sink is passing audio so that's good. The issue with the sink
is there is about 3 seconds of latency. I can see ~1 second of that due
to the cellular network.
How would I check the latency through pulseaudio ?
Thanks
Angus
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