[alsa-devel] Timer instability

[Clive Messer]

On Wednesday 25 Feb 2009 16:59:48 Takashi Iwai wrote:
> Oops, sorry, pasted a wrong version.
> Here it is.
>
>
> thanks,
>
> Takashi
> ---
> diff --git a/src/pcm/pcm_hw.c b/src/pcm/pcm_hw.c
> index e9ce092..5211d1c 100644
> --- a/src/pcm/pcm_hw.c
> +++ b/src/pcm/pcm_hw.c
> @@ -131,6 +131,10 @@ struct timespec snd_pcm_hw_fast_tstamp(snd_pcm_t *pcm)
>  static int sync_ptr1(snd_pcm_hw_t *hw, unsigned int flags)
>  {
>         int err;
> +       long old_hwptr, new_hwptr;
> +       long old_applptr, new_applptr;
> +       old_hwptr = hw->sync_ptr->s.status.hw_ptr;
> +       old_applptr = hw->sync_ptr->c.control.appl_ptr;
>         hw->sync_ptr->flags = flags;
>         err = ioctl((hw)->fd, SNDRV_PCM_IOCTL_SYNC_PTR, (hw)->sync_ptr);
>         if (err < 0) {
> @@ -138,6 +142,11 @@ static int sync_ptr1(snd_pcm_hw_t *hw, unsigned int
> flags) SYSMSG("SNDRV_PCM_IOCTL_SYNC_PTR failed");
>                 return err;
>         }
> +       new_hwptr = hw->sync_ptr->s.status.hw_ptr;
> +       new_applptr = hw->sync_ptr->c.control.appl_ptr;
> +       printf("sync_ptr1: %ld(%ld), %ld(%ld)\n",
> +              new_hwptr, new_hwptr - old_hwptr,
> +              new_applptr, new_applptr - old_applptr);
>         return 0;
>  }
>  

Takashi,

Applied, but I'm not getting any "sync_ptr1: .... " logging on stdout. Any 
ideas?

Regards

Clive
-- 
Clive Messer <clive at vacuumtube.org.uk>