Disable PCM plugins
#include <sys/asoundlib.h> unsigned int snd_pcm_plugin_set_disable( snd_pcm_t *pcm, unsigned int plugins );
The plugin-aware versions of the PCM read and write calls don't require that you work with multiples of fragment-size blocks (the nonplugin-aware versions do). This is because one of the plugins in the lib sub-buffers the data for you. You can disable this plugin by setting the PLUGIN_BUFFER_PARTIAL_BLOCKS bit with this function, in which case the plugin-aware versions also fail on reads and writes that aren't multiples of the fragment size.
Either way, interleaved stereo data has to be aligned by the sample size times the number of channels (i.e., each write must have the same number of samples for the left and right channels).
snd_pcm_plugin_set_disable(handle, PLUGIN_CONVERSION);
You can use snd_pcm_plugin_set_disable() to disable plugins that are ordinarily used in the plugin chain. You need to do this before calling snd_pcm_plugin_params().
The updated bitmap of disabled plugins.
See the wave.c example in the appendix.
QNX Neutrino
Safety: | |
---|---|
Cancellation point | No |
Interrupt handler | No |
Signal handler | Yes |
Thread | Read the Caveats |
This function isn't thread safe if pcm (snd_pcm_t) is used across multiple threads.