[alsa-devel] SNDRV_PCM_TRIGGER_STOP and audio still queued in the driver

[Jon Smirl]

On Sat, Aug 15, 2009 at 11:53 AM, Jon Smirl<jonsmirl at gmail.com> wrote:
> void
> bfio_synch_stop(void)
> {
>    int n;
>
>    if (base_handle == NULL) {
>        return;
>    }
>    FOR_IN_AND_OUT {
>        for (n = 0; n < n_handles[IO]; n++) {

I added:
snd_pcm_nonblock(handles[IO][n], 0)
snd_pcm_drain(handles[IO][n])
snd_pcm_nonblock(handles[IO][n], SND_PCM_NONBLOCK )

>            snd_pcm_close(handles[IO][n]);
>        }
>    }
> }

This is not working correctly.
snd_pcm_nonblock(handles[IO][n], 0)
It does not remove O_NONBLOCK for some unknown reason.

I added printf() to snd_pcm_hw_nonblock()
The fcntl is not getting an error.
	if (fcntl(fd, F_SETFL, flags) < 0) {
Flags being set are 2 (O_RDWR).

But when I get over to snd_pcm_pre_drain_init(), I get the -EAGAIN error.
static int snd_pcm_pre_drain_init(struct snd_pcm_substream *substream,
int state)
{
	printk("snd_pcm_pre_drain_init\n");
	if (substream->f_flags & O_NONBLOCK)
		return -EAGAIN;
	printk("snd_pcm_pre_drain_init 1\n");
	substream->runtime->trigger_master = substream;
	return 0;
}
So I have to conclude that fcntl(fd, F_SETFL, flags) is not removing
the O_NONBLOCK flag.

If I change the inital PCM open to be blocking everything works as expected.




-- 
Jon Smirl
jonsmirl at gmail.com