diff options
| -rw-r--r-- | libSBRdec/src/lpp_tran.cpp | 28 |
1 files changed, 14 insertions, 14 deletions
diff --git a/libSBRdec/src/lpp_tran.cpp b/libSBRdec/src/lpp_tran.cpp index bdbafa6..113b1de 100644 --- a/libSBRdec/src/lpp_tran.cpp +++ b/libSBRdec/src/lpp_tran.cpp @@ -1,7 +1,7 @@ /* ----------------------------------------------------------------------------- Software License for The Fraunhofer FDK AAC Codec Library for Android -© Copyright 1995 - 2019 Fraunhofer-Gesellschaft zur Förderung der angewandten +© Copyright 1995 - 2020 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. All rights reserved. 1. INTRODUCTION @@ -216,19 +216,21 @@ static inline void calc_qmfBufferReal(FIXP_DBL **qmfBufferReal, const FIXP_DBL *const lowBandReal, const int startSample, const int stopSample, const UCHAR hiBand, - const int dynamicScale, const int descale, + const int dynamicScale, const FIXP_SGL a0r, const FIXP_SGL a1r) { - FIXP_DBL accu1, accu2; - int i; + const int dynscale = fixMax(0, dynamicScale - 1) + 1; + const int rescale = -fixMin(0, dynamicScale - 1) + 1; + const int descale = + fixMin(DFRACT_BITS - 1, LPC_SCALE_FACTOR + dynamicScale + rescale); + + for (int i = 0; i < stopSample - startSample; i++) { + FIXP_DBL accu; - for (i = 0; i < stopSample - startSample; i++) { - accu1 = fMultDiv2(a1r, lowBandReal[i]); - accu1 = (fMultDiv2(a0r, lowBandReal[i + 1]) + accu1); - accu1 = accu1 >> dynamicScale; + accu = fMultDiv2(a1r, lowBandReal[i]) + fMultDiv2(a0r, lowBandReal[i + 1]); + accu = (lowBandReal[i + 2] >> descale) + (accu >> dynscale); - accu1 <<= 1; - accu2 = (lowBandReal[i + 2] >> descale); - qmfBufferReal[i + startSample][hiBand] = accu1 + accu2; + qmfBufferReal[i + startSample][hiBand] = + SATURATE_LEFT_SHIFT(accu, rescale, DFRACT_BITS); } } @@ -810,9 +812,7 @@ void lppTransposer( FDK_ASSERT(dynamicScale >= 0); calc_qmfBufferReal( qmfBufferReal, &(lowBandReal[LPC_ORDER + startSample - 2]), - startSample, stopSample, hiBand, dynamicScale, - fMin(DFRACT_BITS - 1, (LPC_SCALE_FACTOR + dynamicScale)), a0r, - a1r); + startSample, stopSample, hiBand, dynamicScale, a0r, a1r); } } /* bw <= 0 */ |