snd_pcm_capture_go()
Start a PCM capture channel running
Synopsis:
#include <sys/asoundlib.h>
int snd_pcm_capture_go ( snd_pcm_t *handle );
Arguments:
- handle
- The handle for the PCM device, which you must have opened by calling snd_pcm_open_name(), snd_pcm_open(), or snd_pcm_open_preferred().
Library:
libasound.so
Description:
The snd_pcm_capture_go() function starts the capture channel.
You should call this function only when the driver is in the
SND_PCM_STATUS_READY state.
Calling this function is required if you've set your capture channel's start
state to SND_PCM_START_GO (see
snd_pcm_plugin_params()).
You can also use this function to kick start
early a capture
channel that has a start state of
SND_PCM_START_DATA or SND_PCM_START_FULL.
If the parameters are valid (i.e., snd_pcm_capture_go() returns zero), then the driver state is changed to SND_PCM_STATUS_RUNNING.
This function is safe to use with plugin-aware functions.
This call is used identically to snd_pcm_plugin_params().
Returns:
EOK on success, a negative errno upon failure. The errno values are available in the errno.h file.
Errors:
- -EINVAL
- The state of handle is invalid, an invalid file descriptor to the channel for capture, or an invalid state change occurred. You can call snd_pcm_channel_status() to check if the state change was invalid.
Classification:
QNX Neutrino
| Safety: | |
|---|---|
| Cancellation point | No |
| Interrupt handler | No |
| Signal handler | Yes |
| Thread | Read the Caveats |
Caveats:
This function is not thread safe if handle (snd_pcm_t) is used across multiple threads.