[alsa-devel] [PATCH v2 0/3] ALSA: pcm: add 'applptr' event of tracepoint

[Takashi Iwai]

On Mon, 12 Jun 2017 02:41:43 +0200,
Takashi Sakamoto wrote:
> 
> Hi,
> 
> This is an update version of my previous patchset.
> 
> [alsa-devel] [PATCH 0/3] ALSA: pcm: add 'applptr' event of tracepoint
> http://mailman.alsa-project.org/pipermail/alsa-devel/2017-June/121657.html
> 
> Chagnes from v1:
>  - rewrite change log for second patch, including content of cover letter
>    in my previous patchset, according to advice from maintainer.
> 
> In design of ALSA PCM core, both of hardware-side and application-side
> position on PCM buffer are maintained as a part of information for
> runtime of PCM substream. In a view of ALSA PCM application, these two
> positions can be updated by executing ioctl(2) with some commands.
> 
> There's an event of tracepoint for hardware-side position; 'hwptr'.
> On the other hand, no events for application-side position.
> 
> This patchset adds a new event for this purpose; 'applptr'. When
> the application-side position is changed in kernel space, this event
> is probed with useful information for developers.
> 
> The event is not probed for all of ALSA PCM applications, In detail,
> please read second patch.
> 
> Takashi Sakamoto (3):
>   ALSA: pcm: unify codes to operate application-side position on PCM
>     buffer
>   ALSA: pcm: add 'applptr' event of tracepoint
>   ALSA: pcm: use %s instead of %c for format of PCM buffer tracepoints

Applied all three patches now.  Thanks.


Takashi