Re: [Alsa-devel] [RFC 5/8] snd-aoa: add codecs
From: Takashi Iwai <hidden>
Date: 2006-06-02 14:31:53
Also in:
alsa-devel
At Thu, 01 Jun 2006 13:58:49 +0200, Johannes Berg wrote:
quoted hunk ↗ jump to hunk
--- /dev/null +++ b/sound/aoa/codecs/snd-aoa-codec-tas-gain-table.h@@ -0,0 +1,209 @@ +/* + This is the program used to generate below table. + +#include <stdio.h> +#include <math.h> +int main() { + int dB2; + printf("/" "* This file is only included exactly once!\n"); + printf(" *\n"); + printf(" * If they'd only tell us that generating this table was\n"); + printf(" * as easy as calculating\n"); + printf(" * hwvalue = 1048576.0*exp(0.057564628*dB*2)\n"); + printf(" * :) *" "/\n"); + printf("static int tas_gaintable[] = {\n"); + printf(" 0x000000, /" "* -infinity dB *" "/\n"); + for (dB2=-140;dB2<=36;dB2++) + printf(" 0x%.6x, /" "* %-02.1f dB *" "/\n", (int)(1048576.0*exp(0.057564628*dB2)), dB2/2.0); + printf("};\n\n"); +}
FYI: We're currently implementing a dB conversion. So, this will be unneeded in future. But I'll included this as it is now at committing, and fix the dB things later. Takashi