diff options
Diffstat (limited to 'libFDK/src/FDK_hybrid.cpp')
| -rw-r--r-- | libFDK/src/FDK_hybrid.cpp | 34 |
1 files changed, 18 insertions, 16 deletions
diff --git a/libFDK/src/FDK_hybrid.cpp b/libFDK/src/FDK_hybrid.cpp index b661f82..08d32a8 100644 --- a/libFDK/src/FDK_hybrid.cpp +++ b/libFDK/src/FDK_hybrid.cpp @@ -1,7 +1,7 @@ /* ----------------------------------------------------------------------------- Software License for The Fraunhofer FDK AAC Codec Library for Android -© Copyright 1995 - 2018 Fraunhofer-Gesellschaft zur Förderung der angewandten +© Copyright 1995 - 2019 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. All rights reserved. 1. INTRODUCTION @@ -142,11 +142,12 @@ amm-info@iis.fraunhofer.de } /* How to arrange the packed values. */ struct FDK_HYBRID_SETUP { - UCHAR nrQmfBands; /*!< Number of QMF bands to be converted to hybrid. */ - UCHAR nHybBands[3]; /*!< Number of Hybrid bands generated by nrQmfBands. */ - SCHAR kHybrid[3]; /*!< Filter configuration of each QMF band. */ - UCHAR protoLen; /*!< Prototype filter length. */ - UCHAR filterDelay; /*!< Delay caused by hybrid filter. */ + UCHAR nrQmfBands; /*!< Number of QMF bands to be converted to hybrid. */ + UCHAR nHybBands[3]; /*!< Number of Hybrid bands generated by nrQmfBands. */ + UCHAR synHybScale[3]; /*!< Headroom needed in hybrid synthesis filterbank. */ + SCHAR kHybrid[3]; /*!< Filter configuration of each QMF band. */ + UCHAR protoLen; /*!< Prototype filter length. */ + UCHAR filterDelay; /*!< Delay caused by hybrid filter. */ const INT *pReadIdxTable; /*!< Helper table to access input data ringbuffer. */ }; @@ -156,12 +157,12 @@ static const INT ringbuffIdxTab[2 * 13] = {0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12}; -static const FDK_HYBRID_SETUP setup_3_16 = {3, {8, 4, 4}, {8, 4, 4}, - 13, (13 - 1) / 2, ringbuffIdxTab}; -static const FDK_HYBRID_SETUP setup_3_12 = {3, {8, 2, 2}, {8, 2, 2}, - 13, (13 - 1) / 2, ringbuffIdxTab}; -static const FDK_HYBRID_SETUP setup_3_10 = {3, {6, 2, 2}, {-8, -2, 2}, - 13, (13 - 1) / 2, ringbuffIdxTab}; +static const FDK_HYBRID_SETUP setup_3_16 = { + 3, {8, 4, 4}, {4, 3, 3}, {8, 4, 4}, 13, (13 - 1) / 2, ringbuffIdxTab}; +static const FDK_HYBRID_SETUP setup_3_12 = { + 3, {8, 2, 2}, {4, 2, 2}, {8, 2, 2}, 13, (13 - 1) / 2, ringbuffIdxTab}; +static const FDK_HYBRID_SETUP setup_3_10 = { + 3, {6, 2, 2}, {3, 2, 2}, {-8, -2, 2}, 13, (13 - 1) / 2, ringbuffIdxTab}; static const FIXP_HTP HybFilterCoef8[] = { HTCP(0x10000000, 0x00000000), HTCP(0x0df26407, 0xfa391882), @@ -477,17 +478,18 @@ void FDKhybridSynthesisApply(HANDLE_FDK_SYN_HYB_FILTER hSynthesisHybFilter, */ for (k = 0; k < nrQmfBandsLF; k++) { const int nHybBands = hSynthesisHybFilter->pSetup->nHybBands[k]; + const int scale = hSynthesisHybFilter->pSetup->synHybScale[k]; FIXP_DBL accu1 = FL2FXCONST_DBL(0.f); FIXP_DBL accu2 = FL2FXCONST_DBL(0.f); /* Perform hybrid filtering. */ for (n = 0; n < nHybBands; n++) { - accu1 += pHybridReal[hybOffset + n]; - accu2 += pHybridImag[hybOffset + n]; + accu1 += pHybridReal[hybOffset + n] >> scale; + accu2 += pHybridImag[hybOffset + n] >> scale; } - pQmfReal[k] = accu1; - pQmfImag[k] = accu2; + pQmfReal[k] = SATURATE_LEFT_SHIFT(accu1, scale, DFRACT_BITS); + pQmfImag[k] = SATURATE_LEFT_SHIFT(accu2, scale, DFRACT_BITS); hybOffset += nHybBands; } |