* Meaning of this Plug PCM Transformation table?
@ 2007-05-14 7:23 Nobin Mathew
0 siblings, 0 replies; only message in thread
From: Nobin Mathew @ 2007-05-14 7:23 UTC (permalink / raw)
To: alsa-devel
Plug PCM: Route conversion PCM (sformat=S16_LE)
Transformation table:
0 <- 0
1 <- 0
Its setup is:
stream : PLAYBACK
access : MMAP_INTERLEAVED
format : S16_LE
subformat : STD
channels : 1
rate : 8000
exact rate : 8000 (8000/1)
msbits : 16
buffer_size : 4000
period_size : 256
period_time : 32000
tick_time : 10000
tstamp_mode : NONE
period_step : 1
sleep_min : 0
avail_min : 256
xfer_align : 256
start_threshold : 3840
stop_threshold : 4000
silence_threshold: 0
silence_size : 0
boundary : 2097152000
Slave: Hardware PCM card 0 'IDENTITY' device 0 subdevice 0
Its setup is:
stream : PLAYBACK
access : MMAP_INTERLEAVED
format : S16_LE
subformat : STD
channels : 2
rate : 8000
exact rate : 8000 (8000/1)
msbits : 16
buffer_size : 4000
period_size : 256
period_time : 32000
tick_time : 10000
tstamp_mode : NONE
period_step : 1
sleep_min : 0
avail_min : 256
xfer_align : 256
start_threshold : 3840
stop_threshold : 4000
silence_threshold: 0
silence_size : 0
boundary : 2097152000
This is capture Handle logs
Plug PCM: Route conversion PCM (sformat=S16_LE)
Transformation table:
0 <- 0*0.5 + 1*0.5
Its setup is:
stream : CAPTURE
access : MMAP_INTERLEAVED
format : S16_LE
subformat : STD
channels : 1
rate : 8000
exact rate : 8000 (8000/1)
msbits : 16
buffer_size : 4000
period_size : 256
period_time : 32000
tick_time : 10000
tstamp_mode : NONE
period_step : 1
sleep_min : 0
avail_min : 256
xfer_align : 256
start_threshold : 1
stop_threshold : 4000
silence_threshold: 0
silence_size : 0
boundary : 2097152000
Slave: Hardware PCM card 0 'IDENTITY' device 0 subdevice 0
Its setup is:
stream : CAPTURE
access : MMAP_INTERLEAVED
format : S16_LE
subformat : STD
channels : 2
rate : 8000
exact rate : 8000 (8000/1)
msbits : 16
buffer_size : 4000
period_size : 256
period_time : 32000
tick_time : 10000
tstamp_mode : NONE
period_step : 1
sleep_min : 0
avail_min : 256
xfer_align : 256
start_threshold : 1
stop_threshold : 4000
silence_threshold: 0
silence_size : 0
boundary : 2097152000
I am having an application which does capture and playback
simultaneously and is single threaded?
What is the meaning of this Transformation table?
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