Commit graph

8 commits

Author SHA1 Message Date
Jaroslav Kysela
a90faa2dd6 axfer: use ATTRIBUTE_UNUSED instead remove argument name
We need to support older compilers than GCC 11.

Link: https://github.com/alsa-project/alsa-utils/issues/233
Fixes: ad5a1c0 ("axfer: fix the verbose compilation warnings for latest gcc")
Signed-off-by: Jaroslav Kysela <perex@perex.cz>
2023-09-04 16:33:47 +02:00
Jaroslav Kysela
ad5a1c0c88 axfer: fix the verbose compilation warnings for latest gcc
Signed-off-by: Jaroslav Kysela <perex@perex.cz>
2023-08-30 12:35:57 +02:00
Takashi Sakamoto
7d7c988e05 axfer: handle -ETIMEDOUT before non-block I/O operation
When running for IRQ-based scheduling model, transmission backend is
expected to queue PCM event in different context from the main thread.
When queueing no events during time equivalent to one period of PCM
buffer, the backend has problems.

This commit outputs report it for non-blocking operation for IRQ-based
scheduling model. The timeout is equivalent to all frames in buffer,
instead of period for safe.

Signed-off-by: Takashi Sakamoto <o-takashi@sakamocchi.jp>
Signed-off-by: Jaroslav Kysela <perex@perex.cz>
2019-10-30 13:13:22 +01:00
Takashi Sakamoto
498ca99461 axfer: code refactoring for a helper function to wait for avail buffer space
This commit applies code refactoring for waiting PCM event queued
per period of PCM buffer in copying operation for IRQ-based scheduling
model.

Signed-off-by: Takashi Sakamoto <o-takashi@sakamocchi.jp>
Signed-off-by: Jaroslav Kysela <perex@perex.cz>
2019-10-30 13:13:22 +01:00
Takashi Sakamoto
cd211d8c22 axfer: add a common interface of waiter for I/O event notification
There're several types of system calls for multiplexed I/O. They're used to
receive notifications of I/O events. Typically, userspace applications call
them against file descriptor to yield CPU. When I/O is enabled on any of
the descriptors, a task of the application is rescheduled, then the
application execute I/O calls.

This commit adds a common interface for this type of system calls, named as
'waiter'. This is expected to be used with non-blocking file operation and
operations on mapped page frame.

Signed-off-by: Takashi Sakamoto <o-takashi@sakamocchi.jp>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
2018-11-13 12:04:48 +01:00
Takashi Sakamoto
0e3a1d9e0b axfer: add an option to suppress event waiting
In aplay, '--test-nowait' is used to suppress calls of snd_pcm_wait()
when I/O operations return -EAGAIN or process truncated number of data
frames. This seems to be for debugging purpose. In this program, this
option is equivalent to suppress event waiting.

This commit adds support for this option.

Signed-off-by: Takashi Sakamoto <o-takashi@sakamocchi.jp>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
2018-11-13 12:04:37 +01:00
Takashi Sakamoto
c46d46a436 axfer: add support for non-blocking operation
In alsa-lib PCM API, snd_pcm_read[i|n]() and snd_pcm_write[i|n] can be
used with non-blocking mode. This is available when SND_PCM_NONBLOCK is
used as 'mode' argument for a call of snd_pcm_open().

This commit adds support this type of operation. To reduce CPU usage, this
commit uses 'snd_pcm_wait()' to wait for event notification.

Below lines are examples to execute:
$ axfer transfer -N -P -d 2 -D hw:0,3 /dev/urandom -f dat -vvv
$ axfer transfer -N -C -d 2 -D hw:1,0 /dev/null -r 48000 -vvv

Signed-off-by: Takashi Sakamoto <o-takashi@sakamocchi.jp>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
2018-11-13 12:04:36 +01:00
Takashi Sakamoto
c2f79d9fdf axfer: add support for blocking data transmission operation of alsa-lib PCM API
In alsa-lib PCM API, snd_pcm_read[i|n]() and snd_pcm_write[i|n]() are used
to transfer data frames from/to hardware. When a handler is not opened with
specific flags, these functions perform blocking operation; i.e. the
function call doesn't return till all of request number of data frames are
actually handled, or call is interrupted by Unix signals, or PCM substeam
corrupts due to hardware reasons.

This commit adds support for this type of data transmission. For cases that
requested data frames are not processed by container interface, this commit
adds internal cache mechanism to handle rest of data frames in next timing.

Signed-off-by: Takashi Sakamoto <o-takashi@sakamocchi.jp>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
2018-11-13 12:04:32 +01:00