Set a PCM channel's configurable parameters
#include <sys/asoundlib.h> int snd_pcm_channel_params( snd_pcm_t *handle, snd_pcm_channel_params_t *params );
Use the -l asound option to qcc to link against this library.
The snd_pcm_channel_params() function sets up the transfer parameters according to the params structure.
You can call the function in SND_PCM_STATUS_NOTREADY (initial) and SND_PCM_STATUS_READY states; otherwise, snd_pcm_channel_params() returns -EBADFD.
If the parameters are valid (i.e. snd_pcm_channel_params() returns zero), the driver state is changed to SND_PCM_STATUS_READY.
The ability to convert audio to match hardware capabilities (for example, voice conversion, rate conversion, type conversion, etc.) is enabled by default. As a result, this function behaves as snd_pcm_plugin_params(), unless you've disabled the conversion by calling:
EOK on success, a negative errno upon failure. The errno values are available in the errno.h file.
- The state of handle is invalid, an invalid params was provided as input, or an invalid state change occurred. You can call snd_pcm_channel_status() to check if the state change was invalid and if you want to recover from the error.
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This function is not thread safe if handle (snd_pcm_t) is used across multiple threads.
Last modified: 2014-06-24