Steps to reproduce this issue (did not connected microphone):
1. paplay /mnt/48k_384.wav &
2. parecord /mnt/test.wav
Once the aplay is finish to playback and got result in test.wav,
it will be containing some noise and data of 48k_384.wav
platform OS: Yocto
>>> list-sources
2 source(s) available.
index: 0
name: <alsa_output.platform-soc_sound-3104.HiFi__plughw_0_0__sink.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 44100Hz
channel map: front-left,front-right
Stereo
used by: 0
linked by: 0
fixed latency: 100.14 ms
monitor_of: 0
card: 0 <alsa_card.platform-soc_sound-3104>
module: 6
properties:
device.description = "Monitor of msm8996-tasha-mtp-snd-card HP Output"
device.class = "monitor"
alsa.card = "0"
alsa.card_name = "msm8996-tasha-mtp-snd-card"
alsa.long_card_name = "msm8996-tasha-mtp-snd-card"
device.bus_path = "platform-soc:sound-3104"
sysfs.path = "/devices/soc/soc:sound-3104/sound/card0"
device.string = "0"
module-udev-detect.discovered = "1"
device.icon_name = "audio-card"
* index: 1
name: <alsa_input.platform-soc_sound-3104.HiFi__plughw_0_0__source>
driver: <module-alsa-card.c>
flags: HARDWARE DECIBEL_VOLUME LATENCY
state: SUSPENDED
suspend cause: IDLE
priority: 9000
volume: mono: 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 1ch 44100Hz
channel map: mono
Mono
used by: 0
linked by: 0
fixed latency: 100.14 ms
card: 0 <alsa_card.platform-soc_sound-3104>
module: 6
properties:
alsa.resolution_bits = "16"
device.api = "alsa"
device.class = "sound"
alsa.class = "generic"
alsa.subclass = "generic-mix"
alsa.name = ""
alsa.id = "MultiMedia1 (*)"
alsa.subdevice = "0"
alsa.subdevice_name = "subdevice #0"
alsa.device = "0"
alsa.card = "0"
alsa.card_name = "msm8996-tasha-mtp-snd-card"
alsa.long_card_name = "msm8996-tasha-mtp-snd-card"
device.bus_path = "platform-soc:sound-3104"
sysfs.path = "/devices/soc/soc:sound-3104/sound/card0"
device.string = "plughw:0,0"
device.buffering.buffer_size = "8832"
device.buffering.fragment_size = "2208"
device.access_mode = "mmap"
device.profile.name = "HiFi: plughw:0,0: source"
device.profile.description = "Headset Microphone"
device.description = "msm8996-tasha-mtp-snd-card Headset Microphone"
module-udev-detect.discovered = "1"
device.icon_name = "audio-card"
ports:
[In] Headset: Headset Microphone (priority 300, latency offset 0 usec, available: unknown)
properties:
active port: <[In] Headset>