This allows starting capture from another thread.
See the commit 932a81519572 ("ALSA: pcm: Comment why read
blocks when PCM is not running") in Linux kernel.
Signed-off-by: Ricardo Biehl Pasquali <pasqualirb@gmail.com>
SUBFORMAT is always zero.
SAMPLE_BITS and FRAME_BITS are refined by ALSA based on the
already set FORMAT and CHANNELS.
Signed-off-by: Ricardo Biehl Pasquali <pasqualirb@gmail.com>
Group read/write transfer into pcm_rw_transfer().
Create pcm_generic_transfer() for read/write and mmap
transfer modes. This recovers from xrun and suspended.
Signed-off-by: Ricardo Biehl Pasquali <pasqualirb@gmail.com>
Make pcm_mmap_transfer() compatible with read/write IO.
start_threshold check was not valid for capture.
pcm->running checks were removed.
NOIRQ fallback was removed. Clocks of sound devices may
differ from the system, leading to desynchronization.
Signed-off-by: Ricardo Biehl Pasquali <pasqualirb@gmail.com>
pcm_get_htimestamp() will be rewritten. Place it after
pcm_avail_update(), which will be used in the rewrite.
Signed-off-by: Ricardo Biehl Pasquali <pasqualirb@gmail.com>
Instead of sending appl_ptr and avail_min to the kernel,
get them. This is the behavior of alsa-lib.
Signed-off-by: Ricardo Biehl Pasquali <pasqualirb@gmail.com>
When hardware pointer update is requested and status
structure is mmaped, call HWSYNC ioctl.
Signed-off-by: Ricardo Biehl Pasquali <pasqualirb@gmail.com>
It's not necessary to send appl_ptr or avail_min to the
kernel here.
In prepare action, called later in pcm_open(), appl_ptr
becomes zero.
avail_min is already defined in software parameters.
Signed-off-by: Ricardo Biehl Pasquali <pasqualirb@gmail.com>
appl_ptr becomes zero in prepare action. avail_min is the
same as when it was set in software parameters.
Signed-off-by: Ricardo Biehl Pasquali <pasqualirb@gmail.com>
The state cannot be assumed as RUNNING after a write
because start_threshold may not have elapsed.
Signed-off-by: Ricardo Biehl Pasquali <pasqualirb@gmail.com>
When pcm device is linked to other pcm device,
the start call may be triggered by other pcm device.
Handle this condition by checing pcm state before start call.
Signed-off-by: Miguel Gaio <mgaio35@gmail.com>
It is valid to get null sync_ptr on dma mmap coherent architecture.
In this case pcm_sync_ptr() is a nop.
Signed-off-by: Miguel Gaio <mgaio35@gmail.com>
As per comment, on success, pcm_writei returns the number of frames written.
Fix the case of pcm not running.
Signed-off-by: Miguel GAIO <mgaio35@gmail.com>
ALSA controls support polling on the kcontrols, this is used in HD-A for
jack notifcation. In tinyalsa we can use this for notfication from sound
card for any events detected by DSP
Change-Id: I4193809bfcdb60f4dc11e1c2ad6a07b29cfa80e9
Signed-off-by: Hardik T Shah <hardik.t.shah@intel.com>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
Signed-off-by: Pankaj Bharadiya <pankaj.laxminarayan.bharadiya@intel.com>
Taylor Holberton