ref: a80a5abfea4b045428056ca0e42cc64d7d667d55
parent: 23b441f4d830ae2b5740c46c73d05883ca2ba461
author: knik <knik>
date: Thu Mar 27 12:06:50 EST 2003
improved quantizer params
--- a/libfaac/aacquant.c
+++ b/libfaac/aacquant.c
@@ -17,7 +17,7 @@
* 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: aacquant.c,v 1.15 2002/12/28 09:22:18 knik Exp $
+ * $Id: aacquant.c,v 1.16 2003/03/27 17:06:50 knik Exp $
*/
#include <math.h>
@@ -52,7 +52,7 @@
int *xi);
static void CalcAllowedDist(PsyInfo *psyInfo, int *cb_offset, int num_cb,
- double *xr, double *xmin, int bits);
+ double *xr, double *xmin, int quality);
static int CountBits(CoderInfo *coderInfo, int *ix, const double *xr);
@@ -177,7 +177,7 @@
int *cb_width,
int num_cb,
double *xr,
- int desired_rate)
+ int quality)
{int sb, i, do_q = 0;
int bits, sign;
@@ -188,7 +188,6 @@
/* Use local copy's */
int *scale_factor = coderInfo->scale_factor;
-
if (coderInfo->block_type == ONLY_SHORT_WINDOW) {SortForGrouping(coderInfo, psyInfo, channelInfo, cb_width, xr);
} else {@@ -215,8 +214,8 @@
if (do_q) {CalcAllowedDist(psyInfo, coderInfo->sfb_offset,
- coderInfo->nr_of_sfb, xr, xmin, desired_rate);
- bits = SearchStepSize(coderInfo, 0.8 * desired_rate, xr_pow, xi);
+ coderInfo->nr_of_sfb, xr, xmin, quality);
+ bits = SearchStepSize(coderInfo, 9 * quality, xr_pow, xi);
FixNoise(coderInfo, xr, xr_pow, xi, xmin);
BalanceEnergy(coderInfo, xr, xi);
UpdateRequant(coderInfo, xi);
@@ -480,11 +479,11 @@
}
static void CalcAllowedDist(PsyInfo *psyInfo, int *cb_offset, int num_cb,
- double *xr, double *xmin, int bits)
+ double *xr, double *xmin, int quality)
{int sfb, start, end;
double xmin0;
- static const double globalthr = 23e-3;
+ const double globalthr = 12.0 / (double)quality;
for (sfb = 0; sfb < num_cb; sfb++)
{@@ -493,7 +492,7 @@
xmin0 = psyInfo->maskEn[sfb];
if (xmin0 > 0.0)
- xmin0 = psyInfo->maskThr[sfb] * (double)end * globalthr / xmin0;
+ xmin0 = psyInfo->maskThr[sfb] * pow(end, 0.6) * globalthr / xmin0;
xmin[sfb] = xmin0;
}
--
⑨