[SCM] libav/experimental: Apply pulses to unscaled coefficients rather than scaled.

[siretart at users.alioth.debian.org]

The following commit has been merged in the experimental branch:
commit 5143684891cae4ec23c599f337c31dd47de13ed3
Author: Alex Converse <alex.converse at gmail.com>
Date:   Sat Sep 13 20:51:36 2008 +0000

    Apply pulses to unscaled coefficients rather than scaled.
    
    Slight reworking of a patch by Alex Converse (alex converse gmail com)
    
    Originally committed as revision 15314 to svn://svn.ffmpeg.org/ffmpeg/trunk

diff --git a/libavcodec/aac.c b/libavcodec/aac.c
index 0e2db12..d18e25b 100644
--- a/libavcodec/aac.c
+++ b/libavcodec/aac.c
@@ -754,12 +754,19 @@ static int decode_spectrum_and_dequant(AACContext * ac, float coef[1024], GetBit
     }
 
     if (pulse_present) {
+        idx = 0;
         for(i = 0; i < pulse->num_pulse; i++){
             float co  = coef_base[ pulse->pos[i] ];
+            while(offsets[idx + 1] <= pulse->pos[i])
+                idx++;
+            if (band_type[idx] != NOISE_BT && sf[idx]) {
             float ico = -pulse->amp[i];
-            if (co)
+            if (co) {
+                co /= sf[idx];
                 ico = co / sqrtf(sqrtf(fabsf(co))) + (co > 0 ? -ico : ico);
-            coef_base[ pulse->pos[i] ] = cbrtf(fabsf(ico)) * ico;
+            }
+            coef_base[ pulse->pos[i] ] = cbrtf(fabsf(ico)) * ico * sf[idx];
+            }
         }
     }
     return 0;

-- 
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