Opensuse 11.3 uses pulseaudio as a standard audio-io. Gnuradio 3.3.x
offers alsa audiosink and audiosource.
When I put "pulse" as parameter for the "device_name" in GRC, with
"verbose" in the "~/.gnuradio/config.conf" I got information about
samplerate and other parameters (see below) -- in my case: the format
S32LE is selected. -- How can I change to use S16LE?
How can I change these audio parameters in GRC? What other parameters
can be changed in ~/.gnuradio/config.conf or by call?
I like to reduce the audio samplerate down to 1000 Hz or up to 192 kHz
-- is there any limit to do this when the hardware supports it?
Are there any changes to do in the pulseaudio "default.pa" or by pactl /
pacmd?
Where can I find some more infomation on that? -- doxygen does not show
enough information even the audio_alsa_sink.h which is given in the
doxygen object.
Thanks for reading and thinking on answers
Michael
By the way -- I made a newer rpm SPEC-file for gnuradio 3.3.0 and
3.3.1-git -- anybody interested obtaining this?
--------------------------------------------------------------------
my config.conf is:
----------8<-------------
[audio_alsa]
default_input_device = pulse
default_output_device = pulse
verbose = true
----------8<--------------
the verbose output in terminal window of grc is
----------8<--------------
PCM name: pulse
Access types:
MMAP_INTERLEAVED NO
MMAP_NONINTERLEAVED NO
MMAP_COMPLEX NO
RW_INTERLEAVED YES
RW_NONINTERLEAVED NO
Formats:
U8 YES
S16_LE YES
S16_BE YES
S32_LE YES
S32_BE YES
FLOAT_LE YES
FLOAT_BE YES
MU_LAW YES
A_LAW YES
Number of channels
min channels: 1
max channels: 32
1 channels YES
2 channels YES
3 channels YES
4 channels YES
5 channels YES
6 channels YES
7 channels YES
8 channels YES
9 channels YES
10 channels YES
11 channels YES
12 channels YES
13 channels YES
14 channels YES
15 channels YES
16 channels YES
Sample Rates:
min rate: 1 (dir = 0)
max rate: 192000 (dir = 0)
8000 YES
16000 YES
22050 YES
32000 YES
44100 YES
48000 YES
96000 YES
192000 YES
audio_alsa_source[pulse]: using S32_LE
audio_alsa_source[pulse]: sample resolution = 32 bits
----------8<--------------
M. Hartje
--
Dr.-Ing. Michael Hartje
Labor Hochspannungstechnik / Labor elektrische Messtechnik
Neustadtswall 30; D-28199 Bremen
Germany
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