QNX Developer Support
|This version of this document is no longer maintained. For the latest documentation, see http://www.qnx.com/developers/docs.|
Set the configurable parameters for a PCM channel (plugin-aware)
#include <sys/asoundlib.h> int snd_pcm_plugin_params( snd_pcm_t *handle, snd_pcm_channel_params_t *params );
- The handle for the PCM device, which you must have opened by calling snd_pcm_open() or snd_pcm_open_preferred().
- A pointer to a snd_pcm_channel_params_t structure in which you've specified the PCM channel's configurable parameters. All members are write-only.
The snd_pcm_plugin_params() function sets up the transfer parameters according to params.
You can call the function in SND_PCM_STATUS_NOTREADY (initial) and SND_PCM_STATUS_READY states; otherwise, snd_pcm_plugin_params() returns -EBADFD.
If the parameters are valid (i.e. snd_pcm_plugin_params() returns zero), the driver state is changed to SND_PCM_STATUS_READY.
|You can confirm the channel's configuration by reading it back with snd_pcm_plugin_setup().|
Zero, or a negative error code.
- Invalid handle; the data pointer is NULL, or the format is unsupported.
See the wave.c example in the appendix.
This function is the plugin-aware version of snd_pcm_channel_params(). 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.