eespjl@xxxxxxxxxx wrote:
> Quoting Udo van den Heuvel <udovdh@xxxxxxxxx>:
>> Interesting theory.
>> How do I find out on what lines my audio comes in?
>
> I think the theory is correct.
>
> arecord -v
> aplay -v
>
> report the transformation table ttable
>
> for recording mono this seems to be default
>
> 0 <- 0*0.0833333 + 1*0.0833333 + 2*0.0833333 + 3*0.0833333 +
> 4*0.0833333 + 5*0.0833333 + 6*0.0833333 + 7*0.0833333 + 8*0.0833333 +
> 9*0.0833333 + 10*0.0833333 + 11*0.0833333
>
> So this would explain why some people report quiet recordings!
Over here I see:
# arecord -v -Dplughw:1
Recording WAVE 'stdin' : Unsigned 8 bit, Rate 8000 Hz, Mono
Plug PCM: Route conversion PCM (sformat=S32_LE)
Transformation table:
0 <- 0*0.0833333 + 1*0.0833333 + 2*0.0833333 + 3*0.0833333 +
4*0.0833333 + 5*0.0833333 + 6*0.083333
3 + 7*0.0833333 + 8*0.0833333 + 9*0.0833333 +
10*0.0833333 + 11*0.0833333
Its setup is:
stream : CAPTURE
access : RW_INTERLEAVED
format : U8
subformat : STD
channels : 1
rate : 8000
exact rate : 8000 (8000/1)
msbits : 8
buffer_size : 4000
period_size : 1000
period_time : 125000
tick_time : 4000
tstamp_mode : NONE
period_step : 1
sleep_min : 0
avail_min : 1000
xfer_align : 1000
start_threshold : 1
stop_threshold : 4000
silence_threshold: 0
silence_size : 0
boundary : 2097152000
Slave: Hardware PCM card 1 'M Audio Delta DiO 2496' device 0 subdevice 0
Its setup is:
stream : CAPTURE
access : MMAP_INTERLEAVED
format : S32_LE
subformat : STD
channels : 12
rate : 8000
exact rate : 8000 (8000/1)
msbits : 24
buffer_size : 4000
period_size : 1000
period_time : 125000
tick_time : 4000
tstamp_mode : NONE
period_step : 1
sleep_min : 0
avail_min : 1000
xfer_align : 1000
start_threshold : 1
stop_threshold : 4000
silence_threshold: 0
silence_size : 0
boundary : 2097152000
RIFF$WAVEfmt @data
> For stereo it records lines 0 and 1.
>
> Transformation table:
> 0 <- 0
> 1 <- 1
So I need to change to 8/9
After that change it gives me:
# arecord -v -f cd -D dig test.wav
Recording WAVE 'test.wav' : Signed 16 bit Little Endian, Rate 44100 Hz,
Stereo
Plug PCM: Route conversion PCM (sformat=S32_LE)
Transformation table:
0 <- 8
1 <- 9
Its setup is:
stream : CAPTURE
access : RW_INTERLEAVED
format : S16_LE
subformat : STD
channels : 2
rate : 44100
exact rate : 44100 (44100/1)
msbits : 16
buffer_size : 5461
period_size : 1365
period_time : 30952
tick_time : 4000
tstamp_mode : NONE
period_step : 1
sleep_min : 0
avail_min : 1365
xfer_align : 1365
start_threshold : 1
stop_threshold : 5461
silence_threshold: 0
silence_size : 0
boundary : 1431568384
Slave: Hardware PCM card 1 'M Audio Delta DiO 2496' device 0 subdevice 0
Its setup is:
stream : CAPTURE
access : MMAP_INTERLEAVED
format : S32_LE
subformat : STD
channels : 12
rate : 44100
exact rate : 44100 (44100/1)
msbits : 24
buffer_size : 5461
period_size : 1365
period_time : 30952
tick_time : 4000
tstamp_mode : NONE
period_step : 1
sleep_min : 0
avail_min : 1365
xfer_align : 1365
start_threshold : 1
stop_threshold : 5461
silence_threshold: 0
silence_size : 0
boundary : 1431568384
(no RIFF....!!)
Aside from the RIFF stuff (there was no SPDIF signal active yet) it
looks a bit better.
Thanks!
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