When ifile option is used for the file plugin, it ignores the slave PCM
and just feeds the input data.
This patch changes the behavior a bit - it uses the slave PCM as the
timing source (just read and throw data away) so that the input data
can be read in the right sample rate.
Addeed a new option "truncate" to indicate the behavior of creating
the output file. When it's true (the default), the file is overwritten
and truncated at creation. When false, the plugin tries to open a
unique file with a number suffix.
The global behavior of "file" and "tee" PCMs is defined via
defaults.pcm.file_truncate option. You can overwrite it in ~/.asoundrc.
There was a change in alsa-lib 1.0.16 which looks like it was designed to
make dmix skip samples in the case of underruns, but it causes the first
sample to be skipped since dmix->slave_hw_ptr == dmix->slave_appl_ptr.
The following patch fixes this and fixes a small typo in the comment.
From: Mike Gorse <mgorse@mgorse.dhs.org>
The direct plugins have the automatic format-detection feature but it
wasn't enabled properly in the interface. Now you can pass the format
"unchanged" to make the plugin detect a proper format.
This will change the default format of some drivers, such as, HD-audio.
In the case of the sum buffer being uninitialized, the source sample
must be negated not only when writing to the sum but also when writing
to the destination.
The rounding done when converting to smaller sample widths fails for
saturated positive samples; in this case, the sample value overflows and
becomes negative. We are better off without rounding, even if we then
have quantization noise (of at most half the resolution of the least
significant bit).
ALSA bug#3360; Debian #437827; GNOME #436192; LP #116990; Mandriva #33908
Rename the local functions to snd1_* so that they won't be exported
out of alsa-lib.
Some functions are still kept because aserver requires them. Sigh.
softvol can be also a pass-thru when the given control already exists
as a hardware control, and the name isn't set properly because of
slave creation. This patch fixes it.
The PCM name isn't set properly on empty and asym plugins due to its call
of snd_pcm_open_slave(). Now a new function snd_pcm_open_named_slave()
is created and make snd_pcm_open_slave() an inline function calling the
new one with name=NULL.
The mmap of multi plugin seems broken (for a long time!) due to its
creation of local buffer via snd_pcm_mmap(). Since the multi plugin
just needs to shadow the mmap buffer of each slave, it now has
mmap_shadow=1 and its own mmap/unmap method to do shadowing.
PCM direct plugins didn't update the timestamp properly.
Now it always starts the slave PCM with MMAP tstamp_mode so that the
timestamp will be being updated. When a client is set up as MMAP
tstamp_mode as well, simply copy this slave timestamp. Otherwise
status callback calculates the current timestamp as usual.
The rate plugin has ugly hacks in poll_descriptors callback to adjust
avail_min when partial read/write occurs. This causes often unexpected
problems like XRUNs, especially with two-period cases.
Let's remove that beast, it's rather harmful than useful.
Signed-off-by: Stas Sergeev <stsp@aknet.ru>
