interrupt in playback mode. Is it
after physically playing out and thus finishing the period_size number
of frames or is it after the period_size number of frames are copied
into the hw buffers(?) of the card?
Exactly at what point does the cm8738 card raise an interrupt?
--Shaju Abraham
trying this 'cos we want the card to raise interrupts
as frequently as possible.
Is this a h/w limitation of ymf724 card or is there any way we can get
to reduce the period size on a ymf724 card to around 64 bytes ?
Thanx in advance,
Shaju Ab
Hi all,
I work on i810 motherboard with built-in sound card.
I use aplay with -F option ( set period-time ) to vary the period-time
from 166 micro secs to 1500 microsecs. I also vary the buffer time (
with -B option)
I observe the following...
1.The number of fragments i.e frags won't inc
Hi all,
Can frags may be more than the number of bds available i.e 32 ? If
yes, does it follow that both of the following cases are possible.
i) the whole buffer (of size buffer_size ) can be
divided between 32 bds so that a given bd will always point to same
address duri
Hi all,
In our study that we are doing abt latency of sound cards, we want
to have a situation where I do not want to use all of the 32 bds
available. we want to use say only 4 or 8 of the bds with each bd
pointing to only a small fragment of data.( This is basically to make
the card interrup
Hi all,
Can u pls tell me what the relation is between runtime->period_size,
runtime->periods and runtime->buffersize ( pcm_native.c ) and
ichdev->size , ichdev->period_size, ichdev->frags ( in intel8x0.c)
Thanx,
--Shaju
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Hi all,
The following is my understanding pls correct me if I am
wrong.
1. Buffer_size is how much of memory has been allocated to buffer the
sound to be played out.
2. Fragment size is the measure of amount of data played between two
consecutive interrupts raised by the c
Can u pls tell me where in the ALSA src code this piece of
action is happening and how to insert my own module on the run.
--shaju abraham
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are called after snd_pcm_oss_write has already been called.
--shaju abraham
Paul Davis wrote:
> > I am in a situation where I intend to call snd_pcm_oss_write
> >directly.
>
> AFAIK, this is not a supported use of the alsa-lib API. There is no
> guarantee th
what else needs to be
done for the call to get through, it will be of great help.
--Shaju Abraham
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us who is disabling the interrupts just before
this is called?
Does spin_lock_irq do that?
We are using RedHat 7.1 linux on i810 motherboard and the latest version
of ALSA 0.9.0.
Shaju Abraham.
ALSA ../alsa-kernel/core/pcm_lib.c:188: Unexpected hw_pointer value
(stream = 0, delta: -68, max jit
happen? Is it a bug in ALSA?
--Shaju Abraham
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Hi all,
I am trying to port ALSA code to rtlinux. I am doing it on a
intel810 chipset(built in sound card) and linux kernel version is 2.4.4
with rt 3.1 patch.
The way we are going abt it is that we are registering the sound card
interrupt with rtlinux instead of linux.
We have also cha
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