snd_pcm_open()

Create a new handle and open a connection to the audio interface

Synopsis:

#include <sys/asoundlib.h>

int snd_pcm_open( snd_pcm_t ** handle, 
                  int card, 
                  int device, 
                  int mode );

The snd_pcm_open() function creates a new handle and opens a connection to the audio interface for soundcard number card (0-N) and audio device number device. It also checks if the protocol is compatible to prevent the use of old programs with a new driver API.

There is no default setup, everything must be prepared with an application.

The following modes should be used for the mode argument:

Mode	Description
SND_PCM_OPEN_PLAYBACK	The playback channel (direction) is opened.
SND_PCM_OPEN_CAPTURE	The capture channel (direction) is opened.
SND_PCM_OPEN_DUPLEX	Both (playback and capture) channels (directions) are opened.
SND_PCM_OPEN_NONBLOCK	This flag may be ORed with any previous modes to force the nonblock mode. The blocking setup may be changed later with snd_pcm_nonblock_mode function(). When this flag isn't, the driver waits until the device isn't free again. Use this flag if you want immediate response.