Hi
I am having problems recording from digital input on a Creative Sound
Blaster X-FI HD. Recordings work using alsa, but I only receive
samples with value zero when using pulseaudio.
This is the source from pacmd list-sources:
index: 3
name:
<alsa_input.usb-Creative_Technology_USB_Sound_Blaster_HD_000000tf-00.iec958-stereo>
driver: <module-alsa-card.c>
flags: HARDWARE DECIBEL_VOLUME LATENCY DYNAMIC_LATENCY
state: RUNNING
suspend cause:
priority: 9048
volume: front-left: 65634 / 100% / 0.04 dB, front-right: 65634 / 100%
/ 0.04 dB
balance 0.00
base volume: 65536 / 100% / 0.00 dB
volume steps: 65537
muted: no
current latency: 0.17 ms
max rewind: 0 KiB
sample spec: s16le 2ch 44100Hz
channel map: front-left,front-right
Stereo
used by: 1
linked by: 1
configured latency: 40.00 ms; range is 0.50 .. 2000.00 ms
card: 1
<alsa_card.usb-Creative_Technology_USB_Sound_Blaster_HD_000000tf-00>
module: 7
properties:
alsa.resolution_bits = "16"
device.api = "alsa"
device.class = "sound"
alsa.class = "generic"
alsa.subclass = "generic-mix"
alsa.name = "USB Audio #1"
alsa.id = "USB Audio"
alsa.subdevice = "0"
alsa.subdevice_name = "subdevice #0"
alsa.device = "1"
alsa.card = "2"
alsa.card_name = "USB Sound Blaster HD"
alsa.long_card_name = "Creative Technology USB Sound Blaster HD
at usb-0000:00:14.0-2, full speed"
alsa.driver_name = "snd_usb_audio"
device.bus_path = "pci-0000:00:14.0-usb-0:2:1.0"
sysfs.path =
"/devices/pci0000:00/0000:00:14.0/usb2/2-2/2-2:1.0/sound/card2"
udev.id =
"usb-Creative_Technology_USB_Sound_Blaster_HD_000000tf-00"
device.bus = "usb"
device.vendor.id = "041e"
device.vendor.name = "Creative Technology, Ltd"
device.product.id = "3232"
device.product.name = "USB Sound Blaster HD"
device.serial =
"Creative_Technology_USB_Sound_Blaster_HD_000000tf"
device.string = "iec958:2"
device.buffering.buffer_size = "352800"
device.buffering.fragment_size = "176400"
device.access_mode = "mmap+timer"
device.profile.name = "iec958-stereo"
device.profile.description = "Digital Stereo (IEC958)"
device.description = "USB Sound Blaster HD Digital Stereo
(IEC958)"
alsa.mixer_name = "USB Mixer"
alsa.components = "USB041e:3232"
module-udev-detect.discovered = "1"
device.icon_name = "audio-card-usb"
ports:
iec958-stereo-input: Digital Input (S/PDIF) (priority 0,
latency offset 0 usec, available: unknown)
properties:
active port: <iec958-stereo-input>
When I configure the the sound card to off in tab Configuration in
pavucontrol this command works giving me a out.wav file with nonzero
samples.
ffmpeg -f alsa -i hw:2,1 -t 30 out.wav
When I configure the digital input in pavucontrol and try this command
I get a recording where all samples are zero.
parec
--device=alsa_input.usb-Creative_Technology_USB_Sound_Blaster_HD_000000tf-00.iec958-stereo
--format=s16le --rate=44100 --channels=2 > samples
Can anyone see what is wrong or help me further investigate the
problem?
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