Finish processing all pending data in a PCM channel's queue and stop the channel
#include <sys/asoundlib.h> int snd_pcm_plugin_flush( snd_pcm_t *handle, int channel );
libasound.so
The snd_pcm_plugin_flush() function flushes all unprocessed data in the driver queue:
If the operation is successful (zero is returned), the channel's state is changed to SND_PCM_STATUS_READY.
A positive number on success, or a negative value on error.
See the wave.c example in the appendix.
QNX Neutrino
Safety: | |
---|---|
Cancellation point | No |
Interrupt handler | No |
Signal handler | Yes |
Thread | Yes |
Because the plugin interface may be subbuffering the written data until a complete driver block can be assembled, the flush call may have to inject up to (blocksize-1) samples into the channel so that the last block can be sent to the driver for playing. For this reason, the flush call may return a positive value indicating that this silence had to be inserted.
This function is the plugin-aware version of snd_pcm_channel_flush(). It functions exactly the same way, with the above caveat. 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_flush(), snd_pcm_channel_flush(), snd_pcm_playback_flush(), snd_pcm_plugin_playback_drain()