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[ALSA] snd-emu10k1: Add a comment explaining the conversion function for dB gain.
author
James Courtier-Dutton
<James@superbug.co.uk>
Fri, 28 Jul 2006 21:27:56 +0000
(22:27 +0100)
committer
Jaroslav Kysela
<perex@suse.cz>
Sat, 23 Sep 2006 08:39:37 +0000
(10:39 +0200)
Signed-off-by: James Courtier-Dutton <James@superbug.co.uk>
Signed-off-by: Jaroslav Kysela <perex@suse.cz>
sound/pci/emu10k1/emufx.c
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diff --git
a/sound/pci/emu10k1/emufx.c
b/sound/pci/emu10k1/emufx.c
index 00fc904c251dc335fc77c87b845eb0efde703cd6..13cd6ce898115171b903283674c90425357b984d 100644
(file)
--- a/
sound/pci/emu10k1/emufx.c
+++ b/
sound/pci/emu10k1/emufx.c
@@
-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,