[alsa-devel] [PATCH tinycompress] cplay: Stop playback stream at the end

[Daniel Baluta]

On Mi, 2018-06-27 at 15:54 +0530, Vinod wrote:
> On 27-06-18, 10:48, Daniel Baluta wrote:
> > 
> > Each compress_start should have a corresponding compress_stop
> > at the end.
> > 
> > Also, this gives user a change to cleanup resources that might
> > have been allocated in compress_start.
> I think the assumptions are not quite correct here, resources should
> be
> allocated in .open and cleanup in .free for driver callback.
> 
> > 
> > 
> > Signed-off-by: Daniel Baluta <daniel.baluta at nxp.com>
> > ---
> > I'm implementing codec library dynamic loading at runtime and I'm
> > exploring
> > using:
> > 	* SNDRV_COMPRESS_START -> to load the library
> > 	* SNDRV_COMPRESS_STOP  -> to unload the library
> > 
> > This might not be the best idea becasue for example loading
> > the library might introduce some delays, anyhow i still think
> > this that compress_stop is correct thing to add at the end of
> > playback.
> I think you should tie the library load to much earlier in path. Not
> in
> start.
> 
> Also, we invoke drain and hence there is no need of stop

Got your point here. 

Perhaps,

 - use .hw_params to load the codec library.
 - add .hw_free (as Liam suggested in a separate email) to unload the      codec library.

Thanks we can drop this patch then.

Daniel.