Hi,
Thanks for getting back me.
Jaroslav Kysela wrote:
> On Fri, 9 Nov 2007, Piers O'Hanlon wrote:
> ....
>
> Could you do whole dump (snd_pcm_dump()) to see all plugins in chain?
> I judge from period_size that we have another problem with rate plugin.
> It would be better to do rate resampling in RAT.
>
I set the period size to the match the closest to the expected minimum
audio packet size (20ms - 320 bytes in our case) - I wasn't sure the
best choice for all parameters. I initially set the buffer size to
approx 3 packets - though I tried increasing to twice that. It just
wasn't clear which parameters were causing it to go into XRUN (I also
set the stop threshold to maximum to make sure it was the stop
threshold - though I guess it it overrun the buffer size we'll get
audio from the beginning of the ring buffer anyway wthat wouldn't sound
too good)
(snd_pcm_dump()) is below:
Plug PCM: Rate conversion PCM (48000, sformat=S16_LE)
Its setup is:
stream : PLAYBACK
access : RW_INTERLEAVED
format : S16_LE
subformat : STD
channels : 1
rate : 16000
exact rate : 16000 (16000/1)
msbits : 16
buffer_size : 2048
period_size : 341
period_time : 21333
tick_time : 0
tstamp_mode : NONE
period_step : 1
sleep_min : 0
avail_min : 341
xfer_align : 1
start_threshold : 341
stop_threshold : 2048
silence_threshold: 0
silence_size : 0
boundary : 536870912
Slave: 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 : 48000
exact rate : 48000 (48000/1)
msbits : 16
buffer_size : 6144
period_size : 1024
period_time : 21333
tick_time : 0
tstamp_mode : NONE
period_step : 1
sleep_min : 0
avail_min : 1024
xfer_align : 3
start_threshold : 1024
stop_threshold : 6144
silence_threshold: 0
silence_size : 0
boundary : 1610612736
Slave: Direct Stream Mixing PCM
Its setup is:
stream : PLAYBACK
access : MMAP_INTERLEAVED
format : S16_LE
subformat : STD
channels : 2
rate : 48000
exact rate : 48000 (48000/1)
msbits : 16
buffer_size : 6144
period_size : 1024
period_time : 21333
tick_time : 0
tstamp_mode : NONE
period_step : 1
sleep_min : 0
avail_min : 1024
xfer_align : 3
start_threshold : 1024
stop_threshold : 6144
silence_threshold: 0
silence_size : 0
boundary : 1610612736
Hardware PCM card 0 'AMD AMD8111' device 0 subdevice 0
Its setup is:
stream : PLAYBACK
access : MMAP_INTERLEAVED
format : S16_LE
subformat : STD
channels : 2
rate : 48000
exact rate : 48000 (48000/1)
msbits : 16
buffer_size : 16384
period_size : 1024
period_time : 21333
tick_time : 4000
tstamp_mode : NONE
period_step : 1
sleep_min : 0
avail_min : 1024
xfer_align : 1024
start_threshold : 1
stop_threshold : 1073741824
silence_threshold: 0
silence_size : 1073741824
boundary : 1073741824
> Jaroslav
>
> -----
> Jaroslav Kysela <perex@xxxxxxxx>
> Linux Kernel Sound Maintainer
> ALSA Project
>
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