On 04/12/2018 01:26 PM, Oleksandr Andrushchenko wrote: > This is the sync up with the canonical definition of the sound > protocol in Xen: > > 1. Protocol version was referenced in the protocol description, > but missed its definition. Fixed by adding a constant > for current protocol version. > > 2. Some of the request descriptions have "reserved" fields > missed: fixed by adding corresponding entries. > > 3. Extend the size of the requests and responses to 64 octets. > Bump protocol version to 2. > > 4. Add explicit back and front synchronization > In order to provide explicit synchronization between backend and > frontend the following changes are introduced in the protocol: > - add new ring buffer for sending asynchronous events from > backend to frontend to report number of bytes played by the > frontend (XENSND_EVT_CUR_POS) > - introduce trigger events for playback control: start/stop/pause/resume > - add "req-" prefix to event-channel and ring-ref to unify naming > of the Xen event channels for requests and events > > 5. Add explicit back and front parameter negotiation > In order to provide explicit stream parameter negotiation between > backend and frontend the following changes are introduced in the protocol: > add XENSND_OP_HW_PARAM_QUERY request to read/update > configuration space for the parameters given: request passes > desired parameter's intervals/masks and the response to this request > returns allowed min/max intervals/masks to be used. > > Signed-off-by: Oleksandr Andrushchenko <oleksandr_andrushchenko@xxxxxxxx> > Signed-off-by: Oleksandr Grytsov <oleksandr_grytsov@xxxxxxxx> > Cc: Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx> > Cc: Takashi Iwai <tiwai@xxxxxxx> > Applied to for-linus-4.17 -boris _______________________________________________ Alsa-devel mailing list Alsa-devel@xxxxxxxxxxxxxxxx http://mailman.alsa-project.org/mailman/listinfo/alsa-devel
