From 381d69840ad3af2259f0b7ef49236f9ee9c76b76 Mon Sep 17 00:00:00 2001
From: Jean-Michel Trivi <jmtrivi@google.com>
Date: Sun, 9 Sep 2012 11:48:51 -0700
Subject: Bug fixes in AAC decoder, AAC encoder, FDK library

Latest code drop from Fraunhofer:

* AAC-Decoder

   - Expanded AAC-LD/ELD decoder TNS max band tables to avoid wrong data
     access for sampling rates <22kHz and >48kHz.
     Modified file(s):
        libAACdec\src\aacdec_tns.cpp
        libAACdec\src\aac_rom.h
        libAACdec\src\aac_rom.cpp

  - Fixed ELD synthesis QMF filterbank scaling for downsampled SBR.
    Modified file(s):
        libFDK\src\qmf.cpp

* AAC-Encoder

  - Fixed bit rate limiting for lower limit as introduced in the Delivery 2012-05-11.
    Modified file(s):
        libAACenc\include\aacenc_lib.h
        libAACenc\src\aacenc.h
        libAACenc\src\aacenc.cpp
        libSBRenc\src\sbr_rom.h
        libSBRenc\src\sbr_rom.cpp

  - Allow negative prediction gain as meaning that there is no coding gain.
    Make use of scaleValueSaturate in gauss window calculation.
    Modified file(s):
        libAACenc\src\aacenc_tns.cpp

  - Added energy saturation to prevent overflow in short blocks.
    Modified file(s):
        libAACenc\src\grp_data.cpp

  - Perform scalefactor adaption in case quantized lines are out of valid range.
    Modified file(s):
        libAACenc\src\quantize.cpp

  - Interrupt quantization loop when no spectral data is available.
    Adjustments in bitreservoir adaption.
    Modified file(s):
        libAACenc\src\qc_main.cpp

  - Indroduced dynamic scaling in none missing harmonic energy lowering compensation.
    Modified file(s):
        libSBRenc\src\env_est.cpp

* FDK-Library

  - Fixed saturation for negative values in scaleValueSaturate.
    Modified file(s):
        libFDK\include\scale.h

Change-Id: If830ea65caef6b5554281e4b7a77a8b2e08825ce
---
 libFDK/include/scale.h | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

(limited to 'libFDK/include/scale.h')

diff --git a/libFDK/include/scale.h b/libFDK/include/scale.h
index fcb6c48..d60ed2c 100644
--- a/libFDK/include/scale.h
+++ b/libFDK/include/scale.h
@@ -148,12 +148,20 @@ FIXP_DBL scaleValueSaturate(
 {
   if(scalefactor > 0) {
     if (fNorm(value) < scalefactor && value != (FIXP_DBL)0) {
-      return (FIXP_DBL)MAXVAL_DBL;
+      if (value > (FIXP_DBL)0) {
+        return (FIXP_DBL)MAXVAL_DBL;
+      } else {
+        return (FIXP_DBL)MINVAL_DBL;
+      }
     } else {
       return (value<<scalefactor);
     }
   } else {
+    if (-(DFRACT_BITS-1) > scalefactor) {
+      return (FIXP_DBL)0;
+    } else {
     return (value>>(-scalefactor));
+    }
   }
 }
 #endif
-- 
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