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ado_pcm_subchn_is_channel()

Check if a channel is a subchannel of a PCM device

Synopsis:

#include <audio_driver.h>

int32_t ado_pcm_subchn_is_channel
  ( ado_pcm_subchn_t *subchn,
    ado_pcm_t *pcm,
    enum pcm_chn_type chn_type );

Arguments:

subchn

A pointer to the ado_pcm_subchn_t structure for the subchannel.

pcm

A pointer to the ado_pcm_t structure created for the PCM device when you called ado_pcm_create().

chn_type

The channel type; one of:

• ADO_PCM_CHANNEL_CAPTURE
• ADO_PCM_CHANNEL_PLAYBACK

Description:

The ado_pcm_subchn_is_channel() function is a convenience function for checking if the subchn is a subchannel of the a PCM device. This function is necessary because the subchn structure is a opaque internal structure. This function is handy in the PCM capabilities() callback (see ado_pcm_hw_t) because all the devices can share the same callback, which uses this function to tell them apart.

Returns:

True if subchn is a subchannel of the PCM device pcm channel of type type.

Classification:

QNX Neutrino

See also:

ado_pcm_hw_t