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| author | Jean-Michel Trivi <jmtrivi@google.com> | 2013-08-08 17:47:33 -0700 |
|---|---|---|
| committer | Jean-Michel Trivi <jmtrivi@google.com> | 2013-08-20 15:05:08 -0700 |
| commit | fc4d7b0e73a87042f87ab847cfbe60e4d2dddf71 (patch) | |
| tree | 2ee8a3fef769c6f4724562c80c774df5b367ef3a /libSBRenc | |
| parent | 60a27b7fe5bf2c3b07ae7f679ca67c0c5cba3b00 (diff) | |
| download | fdk-aac-dabplus-fc4d7b0e73a87042f87ab847cfbe60e4d2dddf71.tar.gz fdk-aac-dabplus-fc4d7b0e73a87042f87ab847cfbe60e4d2dddf71.tar.bz2 fdk-aac-dabplus-fc4d7b0e73a87042f87ab847cfbe60e4d2dddf71.zip | |
SBR encoder improvement
SBR encoder: Introduce coupling energy ratio limitation to prevent undesirable SBR band
amplification while decoding.
Bug 9428126
Change-Id: I18a77cd1a178fff7531b490779a29a0df7d993af
Diffstat (limited to 'libSBRenc')
| -rw-r--r-- | libSBRenc/src/env_est.cpp | 18 | ||||
| -rw-r--r-- | libSBRenc/src/sbr_encoder.cpp | 2 |
2 files changed, 10 insertions, 10 deletions
diff --git a/libSBRenc/src/env_est.cpp b/libSBRenc/src/env_est.cpp index e441cbd..9924348 100644 --- a/libSBRenc/src/env_est.cpp +++ b/libSBRenc/src/env_est.cpp @@ -817,22 +817,22 @@ calculateSbrEnvelope (FIXP_DBL **RESTRICT YBufferLeft, /*! energy buffer left * } /* ld64 to integer conversion */ - nrgLeft = fixMin(fixMax(nrgLeft,FL2FXCONST_DBL(0.0f)),FL2FXCONST_DBL(0.5f)); + nrgLeft = fixMin(fixMax(nrgLeft,FL2FXCONST_DBL(0.0f)),(FL2FXCONST_DBL(0.5f)>>oneBitLess)); nrgLeft = (FIXP_DBL)(LONG)nrgLeft >> (DFRACT_BITS-1-LD_DATA_SHIFT-1-oneBitLess-1); sfb_nrgLeft[m] = ((INT)nrgLeft+1)>>1; /* rounding */ if (stereoMode == SBR_COUPLING) { FIXP_DBL scaleFract; + int sc0, sc1; - if (nrgRight != FL2FXCONST_DBL(0.0f)) { - int sc0 = CountLeadingBits(nrgLeft2); - int sc1 = CountLeadingBits(nrgRight); + nrgLeft2 = fixMax((FIXP_DBL)0x1, nrgLeft2); + nrgRight = fixMax((FIXP_DBL)0x1, nrgRight); - scaleFract = ((FIXP_DBL)(sc0-sc1)) << (DFRACT_BITS-1-LD_DATA_SHIFT); /* scale value in ld64 representation */ - nrgRight = CalcLdData(nrgLeft2<<sc0) - CalcLdData(nrgRight<<sc1) - scaleFract; - } - else - nrgRight = FL2FXCONST_DBL(0.5f); /* ld64(4294967296.0f) */ + sc0 = CountLeadingBits(nrgLeft2); + sc1 = CountLeadingBits(nrgRight); + + scaleFract = ((FIXP_DBL)(sc0-sc1)) << (DFRACT_BITS-1-LD_DATA_SHIFT); /* scale value in ld64 representation */ + nrgRight = CalcLdData(nrgLeft2<<sc0) - CalcLdData(nrgRight<<sc1) - scaleFract; /* ld64 to integer conversion */ nrgRight = (FIXP_DBL)(LONG)(nrgRight) >> (DFRACT_BITS-1-LD_DATA_SHIFT-1-oneBitLess); diff --git a/libSBRenc/src/sbr_encoder.cpp b/libSBRenc/src/sbr_encoder.cpp index ce02cf5..ac0c869 100644 --- a/libSBRenc/src/sbr_encoder.cpp +++ b/libSBRenc/src/sbr_encoder.cpp @@ -103,7 +103,7 @@ amm-info@iis.fraunhofer.de #define SBRENCODER_LIB_VL0 3 #define SBRENCODER_LIB_VL1 3 -#define SBRENCODER_LIB_VL2 0 +#define SBRENCODER_LIB_VL2 1 |