ref: 2d367d24a8b6a9af6c7593d414f798e9af3271a8
parent: 7e2721bed5c84b6b1467581fd1640c2f08d94cfd
author: danchr <danchr>
date: Wed Mar 17 08:34:20 EST 2004
Automatic, untuned setting of lowpass for VBR.
--- a/libfaac/frame.c
+++ b/libfaac/frame.c
@@ -16,7 +16,7 @@
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
- * $Id: frame.c,v 1.57 2004/03/15 20:16:42 knik Exp $
+ * $Id: frame.c,v 1.58 2004/03/17 13:34:20 danchr Exp $
*/
/*
@@ -61,11 +61,15 @@
};
static SR_INFO srInfo[12+1];
-static const int bwmax = 16000;
+
+// base bandwidth for q=100
+static const int bwbase = 16000;
+// bandwidth multiplier (for quantiser)
+static const int bwmult = 120;
+// max bandwidth/samplerate ratio
static const double bwfac = 0.45;
-
int FAACAPI faacEncGetVersion( char **faac_id_string,
char **faac_copyright_string)
{@@ -224,8 +228,8 @@
(double)config->bandWidth * hEncoder->sampleRate / 44100;
config->bitRate = (double)config->bitRate * hEncoder->sampleRate / 44100;
- if (config->bandWidth > bwmax)
- config->bandWidth = bwmax;
+ if (config->bandWidth > bwbase)
+ config->bandWidth = bwbase;
}
hEncoder->config.bitRate = config->bitRate;
@@ -232,9 +236,7 @@
if (!config->bandWidth)
{- config->bandWidth = bwfac * hEncoder->sampleRate;
- if (config->bandWidth > bwmax)
- config->bandWidth = bwmax;
+ config->bandWidth = (config->quantqual - 100) * bwmult + bwbase;
}
hEncoder->config.bandWidth = config->bandWidth;
@@ -308,8 +310,8 @@
hEncoder->config.useTns = 0;
hEncoder->config.bitRate = 0; /* default bitrate / channel */
hEncoder->config.bandWidth = bwfac * hEncoder->sampleRate;
- if (hEncoder->config.bandWidth > bwmax)
- hEncoder->config.bandWidth = bwmax;
+ if (hEncoder->config.bandWidth > bwbase)
+ hEncoder->config.bandWidth = bwbase;
hEncoder->config.quantqual = 100;
hEncoder->config.psymodellist = (psymodellist_t *)psymodellist;
hEncoder->config.psymodelidx = 0;
@@ -942,6 +944,9 @@
/*
$Log: frame.c,v $
+Revision 1.58 2004/03/17 13:34:20 danchr
+Automatic, untuned setting of lowpass for VBR.
+
Revision 1.57 2004/03/15 20:16:42 knik
fixed copyright notice
--
⑨