Dear everybody.
1. Summary
I have tried to setup hw parameters with hda-intel driver.
But I can't setup period_size to 160.
The return value of snd_pcm_hw_params_set_period_size_near is 170.
Is it right ?
I want to play MU_LAW stream. So, period_size must be 160.
2. Environment
driver 1.0.21
hda-intel - HDA-Nvidia
Sigmatel STAC9200
kernel 2.6.32.6-36.fc12.i686
3. An output of aplay with 8KHz MONO wave file
Plug PCM: Rate conversion PCM (48000, sformat=S16_LE)
Converter: linear-interpolation
Protocol version: 10002
Its setup is:
stream : PLAYBACK
access : RW_INTERLEAVED
format : S16_LE
subformat : STD
channels : 1
rate : 8000
exact rate : 8000 (8000/1)
msbits : 16
buffer_size : 2730
period_size : 170
period_time : 21333
tstamp_mode : NONE
period_step : 1
avail_min : 170
period_event : 0
start_threshold : 2730
stop_threshold : 2730
silence_threshold: 0
silence_size : 0
boundary : 178913280
Slave: Route conversion PCM (sformat=S32_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 : 16384
period_size : 1024
period_time : 21333
tstamp_mode : NONE
period_step : 1
avail_min : 1024
period_event : 0
start_threshold : 16384
stop_threshold : 16384
silence_threshold: 0
silence_size : 0
boundary : 1073741824
Slave: Soft volume PCM
Control: PCM Playback Volume
Regards
----------
MASAO TAKAHASHI <[email protected]>
KANNO WORKS CO., LTD. JAPAN
TEL 093-436-2330
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