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Commit 7012b2da authored by James Courtier-Dutton's avatar James Courtier-Dutton Committed by Jaroslav Kysela
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[ALSA] snd-emu10k1: Add a comment explaining the conversion function for dB gain. 




Signed-off-by: default avatarJames Courtier-Dutton <James@superbug.co.uk>
Signed-off-by: default avatarJaroslav Kysela <perex@suse.cz>
parent 4e195a7b

sound/pci/emu10k1/emufx.c

+1 −0
Original line number Diff line number Diff line
@@ -267,6 +267,7 @@ static const u32 treble_table[41][5] = { 
	{ 0x37c4448b, 0xa45ef51d, 0x262f3267, 0x081e36dc, 0xfd8f5d14 }

};



/* dB gain = (float) 20 * log10( float(db_table_value) / 0x8000000 ) */

static const u32 db_table[101] = {

	0x00000000, 0x01571f82, 0x01674b41, 0x01783a1b, 0x0189f540,

	0x019c8651, 0x01aff763, 0x01c45306, 0x01d9a446, 0x01eff6b8,