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Commit a7e8f861 authored by Andy Hung's avatar Andy Hung Committed by Rom Lemarchand
Browse files

Add channel count functions for audio masks 



audio_channel_count_from_in_mask
audio_channel_count_from_out_mask

Change-Id: Ic519f2c3f85d14acb9526cc8812360fcbd15346d
Signed-off-by: default avatarAndy Hung <hunga@google.com>
parent 14b667aa

include/system/audio.h

+16 −0
Original line number Diff line number Diff line
@@ -590,6 +590,22 @@ static inline bool audio_is_output_channel(audio_channel_mask_t channel) 
        return false;

}



/* Returns the number of channels from an input channel mask,

 * used in the context of audio input or recording.

 */

static inline uint32_t audio_channel_count_from_in_mask(audio_channel_mask_t channel)

{

    return popcount(channel & AUDIO_CHANNEL_IN_ALL);

}



/* Returns the number of channels from an output channel mask,

 * used in the context of audio output or playback.

 */

static inline uint32_t audio_channel_count_from_out_mask(audio_channel_mask_t channel)

{

    return popcount(channel & AUDIO_CHANNEL_OUT_ALL);

}



/* Derive an output channel mask from a channel count.

 * This is to be used when the content channel mask is unknown. The 1, 2, 4, 5, 6, 7 and 8 channel

 * cases are mapped to the standard game/home-theater layouts, but note that 4 is mapped to quad,