- Fixed unbalanced semaphores (which may cause deadlock)
- Do semaphore-up before blocking calls for communication with the server
- Don't discard semaphores on the client side
- Open slave PCMs always in non-blocking mode to avoid blocking by semaphore
with the secondary open
Add snd_pcm_hw_params_get/set_export_buffer() API functions.
They control to ensure the buffer export to other processes.
If this flag is set, the local buffer of a plugin is exported over IPC shm.
Otherwise the buffer can be handled only locally (no shm).
Also fixed Version file for 1.0.9.
dmix transfers data in asynchronously so that it doesn't write on the
last active period. This will allow the arbitrary buffer size in
future, too.
The hwsync call to slave is removed from commit and hwsync callbacks.
This hack was added to fix the noisy output (typically on xmms/bmp)
but it doesn't happen any more. Now the hwsync behavior is as same as
on 1.0.8 (i.e. hwsync is called only when slowptr option is set).
- Added protocl version check. The caller of snd_pcm_{io|ext}plug_create()
must fill version field with SND_PCM_{IO|EXT}PLUG_VERSION beforehand.
- Added poll_descriptors and poll_descriptors_count callbacks for ioplug.
Fix by Istvan Varadi <ivaradi@gmail.com>
- start the playback with snd_pcm_hw_start failed with -EPIPE, because
some pointers were not updated. I attached a patch for alsa-lib 1.0.8,
in which sync_ptr is called before SNDRV_PCM_IOCTL_START. It seems to
solve the problem, though I don't know alsa-lib enough to be sure that
this is the right solution...
- Fix CPU hang-up during snd_pcm_drain()
A new internal function snd_pcm_wait_nocheck() to force to call poll().
- Clean up, fix status() callback of dmix
More fixes for 100% CPU hang-up problem with dmix.
- Clear timer queues properly when XRUN happens.
- Don't check XRUN when the stream isn't really running.
- Do hwsync properly for the delayed start state.
Support dmix on generic architectures without atomic operations but
using a semaphore to avoid concurrent accesses. This is less effective
than atomic operations but should work on every system.
Call hwsync of slave PCM on snd_pcm_hwsync() over dmix.
This reduces ocasional output noises, typically seen in xmms and bmp with
multi-threading on SMP/HT systems.
Disabled slowptr of default dmix definition again.
Introducing a private state for the delayed start of PCM stream.
This problem occurs when the rate plugin doesn't feed the data
properly before triggering START. This results in weird problems,
e.g. an inifinte loop of artsd eating 100% CPU time.
To solve this problem, the state is marked as "pending" when no
data appears at the trigger, and the stream is started later at
the mmap commit.
