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Signal the driver to ready the specified channel (plugin-aware)
#include <sys/asoundlib.h>
int snd_pcm_plugin_prepare( snd_pcm_t *handle,
int channel );
- handle
- The handle for the PCM device, which you must have opened by calling
snd_pcm_open()
or
snd_pcm_open_preferred().
- channel
- The channel; SND_PCM_CHANNEL_CAPTURE or
SND_PCM_CHANNEL_PLAYBACK.
libasound.so
The snd_pcm_plugin_prepare() function
prepares hardware to operate in a specified transfer direction.
This call is responsible for all parts of the hardware's startup
sequence that require additional initialization time, allowing
the final “GO” (usually from writes into the buffers)
to execute more quickly.
This function may be called in all states except
SND_PCM_STATUS_NOTREADY (returns -EBADFD) and
SND_PCM_STATUS_RUNNING (returns -EBUSY).
If the operation is successful (zero is returned), the driver
state is changed to SND_PCM_STATUS_PREPARED.
|
If your channel has underrun (during playback) or overrun (during capture),
you have to reprepare it before continuing.
For an example, see
wave.c
and
waverec.c
in the appendix. |
Zero, or a negative error code.
- -EBUSY
- The subchannel is in the running state.
- -EINVAL
- Invalid handle.
See the
wave.c example
in the appendix.
QNX Neutrino
Safety: | |
Cancellation point |
No |
Interrupt handler |
No |
Signal handler |
Yes |
Thread |
Yes |
This function is the plugin-aware version of
snd_pcm_channel_prepare().
It functions exactly the same way.
However, make sure that you don't mix and match plugin- and nonplugin-aware
functions in your application, or you may get undefined
behavior and misleading results.
snd_pcm_capture_prepare(),
snd_pcm_channel_prepare(),
snd_pcm_playback_prepare()
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