18 Feb
2011
18 Feb
'11
2:16 a.m.
On Wed, 2011-02-16 at 19:51 +0200, Alfs Kurmis wrote:
--
A Charlatan with a Cembalo and other friends of The Little Matchgirl
http://mx44.linux.dk/charlatan/
Hi Experts.
I wanna normalize my sound stream by loudness (energy / pressure /
intensity) , not by peaks.
How i do it ?
Is available Jack plugin for so what ?
What is (we hear as) "loudness" ?
RMS or +(average) or something else ?
What we /hear/ as loudness are the transients, which you can detect by
summing up the delta values between samples. The following hack
visualizes that the commercials really are annoyingly loud compared to
regular programming:
// samplerate 96k, periodsize 256, updates 25 per second
static long long sum = 0;
static int previous = 0;
static int count = 0;
for(i = 0; i < 256; i++)
{
long long x = (in_buffer[i][0] - previous);
sum += llabs(x);
previous = in_buffer[i][0];
if(++count > (96000/25))
{
unsigned int s = sum>>31;
fputs
("\r : : : : : : : ] \r[",
stdout);
while(s)
putchar('|'),
s >>= 1,s += (s>>1)+(s>>2);
fflush(stdout);
sum -= sum >>3;
count = 0;
}
}