[alsa-devel] [alsa-lib][RFC][PATCH 0/9] pcm: handle status/control mapping independently

[Takashi Sakamoto]

Hi,

This RFC patchset is for recent discussion about new version of PCM
protocol/interface (2.0.14). This is accumulated on the below patchset.
http://mailman.alsa-project.org/pipermail/alsa-devel/2017-June/122066.html

In the discussion, we found an advantage to handle page mapping for
status/control data of runtime of PCM substream independently. Aim of
this patchset is a proof-of-concept for alsa-lib.

I tested this patchset with two machines based on x86/armv7a architectures.
This looks work well without any regression. But I've never tested a case
in which mapping is failed for one of the status/control data.

For your information.

Takashi Sakamoto (9):
  pcm: obsolete 'mmap_emulation' parameter of snd_pcm_hw_open_fd()
  pcm: minor code refactoring for ioctl call
  pcm: handle status/control mapping independently
  pcm: add a helper function to query status of PCM substream
  pcm: add a helper function to query hwptr
  pcm: add a helper function to query applptr
  pcm: add a helper function to issue avail_min
  pcm: add a helper function to issue applptr
  pcm: code refactoring to use helper functions

 src/pcm/pcm_direct.c |   2 +-
 src/pcm/pcm_hw.c     | 324 +++++++++++++++++++++++++++++++++------------------
 src/pcm/pcm_local.h  |   3 +-
 3 files changed, 214 insertions(+), 115 deletions(-)

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2.11.0