Re: [alsa-devel] i think ac97 needs an is_surback_on() function

At Fri, 22 Aug 2008 15:20:09 -0700, John L. Utz III wrote:

ac97_patch.c provides two helper functions that wrap the channel_mode variable, but they only take you out to 5.1 Audio:

static inline int is_surround_on(struct snd_ac97 *ac97) { return ac97->channel_mode >= 1; }

static inline int is_clfe_on(struct snd_ac97 *ac97) { return ac97->channel_mode >= 2; }

For 7.1 Audio, i think there needs to be a test for 'Surround Back' or 'Back Surround'

static inline int is_surback_on(struct snd_ac97 *ac97) { return ac97->channel_mode >= 4; }

Am i correct? or am i mistaken? agreement or corrections appreciated!

It's correct. The code for 7.1-audio capability was added recently.

Takashi