I found another clue to this but can anyone please explain what could be going wrong?
The execution enters into the following function
>static int snd_pcm_update_hw_ptr_interrupt(struct snd_pcm_substream >*substream)
>{
> ....
> new_hw_ptr = hw_base + pos;
this gets updated correctly
> ...
> hdelta = new_hw_ptr - old_hw_ptr;
> jdelta = jiffies - runtime->hw_ptr_jiffies;
as far as I don't get into the following loop, am good...the moment I get into this loop my new_hw_ptr gets modified and it does not progress in capture. Any clues?
> if (((hdelta * HZ) / runtime->rate) > jdelta + HZ/100) {
> delta = jdelta /
> (((runtime->period_size * HZ) / runtime->rate)
> + HZ/100);
> hw_ptr_error(substream,
> "hw_ptr skipping! [Q] "
> "(pos=%ld, delta=%ld, period=%ld, "
> "jdelta=%lu/%lu/%lu)\n",
> (long)pos, (long)hdelta,
> (long)runtime->period_size, jdelta,
> ((hdelta * HZ) / runtime->rate), delta);
> hw_ptr_interrupt = runtime->hw_ptr_interrupt +
> runtime->period_size * delta;
> if (hw_ptr_interrupt >= runtime->boundary)
> hw_ptr_interrupt -= runtime->boundary;
> /* rebase to interrupt position */
> hw_base = new_hw_ptr = hw_ptr_interrupt;
> /* align hw_base to buffer_size */
> hw_base -= hw_base % runtime->buffer_size;
> delta = 0;
> }
> ...
>}
Thanks,
Harsha
______________________________________
From: Harsha, Priya
Sent: Saturday, June 27, 2009 9:18 AM
To: alsa-devel@xxxxxxxxxxxxxxxx
Subject: snd_pcm_lib_read1 timeout
Hi,
I have a basic question;
There is a schedule_timeout() in snd_pcm_lib_read1 -> wait_for_avail_min. When and where does this timeout get signaled? What would be the reason that this timeout happens?
Thanks,
Harsha
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