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| author | android-build-team Robot <android-build-team-robot@google.com> | 2018-05-24 07:24:38 +0000 |
|---|---|---|
| committer | android-build-team Robot <android-build-team-robot@google.com> | 2018-05-24 07:24:38 +0000 |
| commit | c85b838a65360747539d85099d92268dd3994d11 (patch) | |
| tree | 4f088dbfd47d22d3f90ebcbcf054a26d6e69bdce /libFDK/src/FDK_lpc.cpp | |
| parent | e30420c551a348fdf0a20888ca2b95b527060061 (diff) | |
| parent | a4d1f0ad52e2cf6f168d2193216602f52033fc27 (diff) | |
| download | fdk-aac-c85b838a65360747539d85099d92268dd3994d11.tar.gz fdk-aac-c85b838a65360747539d85099d92268dd3994d11.tar.bz2 fdk-aac-c85b838a65360747539d85099d92268dd3994d11.zip | |
Snap for 4801384 from a4d1f0ad52e2cf6f168d2193216602f52033fc27 to pi-release
Change-Id: Iab0959417db83cdeb3af7ce59ef4d8584a96b8be
Diffstat (limited to 'libFDK/src/FDK_lpc.cpp')
| -rw-r--r-- | libFDK/src/FDK_lpc.cpp | 15 |
1 files changed, 11 insertions, 4 deletions
diff --git a/libFDK/src/FDK_lpc.cpp b/libFDK/src/FDK_lpc.cpp index 2ba7707..7d7e691 100644 --- a/libFDK/src/FDK_lpc.cpp +++ b/libFDK/src/FDK_lpc.cpp @@ -184,12 +184,19 @@ void CLpc_SynthesisLattice(FIXP_DBL *signal, const int signal_size, for (i = signal_size; i != 0; i--) { FIXP_DBL *pState = state + order - 1; const FIXP_DBL *pCoeff = coeff + order - 1; - FIXP_DBL tmp; + FIXP_DBL tmp, accu; + + accu = + fMultSubDiv2(scaleValue(*pSignal, signal_e - 1), *pCoeff--, *pState--); + tmp = SATURATE_LEFT_SHIFT_ALT(accu, 1, DFRACT_BITS); - tmp = scaleValue(*pSignal, signal_e) - fMult(*pCoeff--, *pState--); for (j = order - 1; j != 0; j--) { - tmp = tmp - fMult(pCoeff[0], pState[0]); - pState[1] = pState[0] + fMult(*pCoeff--, tmp); + accu = fMultSubDiv2(tmp >> 1, pCoeff[0], pState[0]); + tmp = SATURATE_LEFT_SHIFT_ALT(accu, 1, DFRACT_BITS); + + accu = fMultAddDiv2(pState[0] >> 1, *pCoeff--, tmp); + pState[1] = SATURATE_LEFT_SHIFT_ALT(accu, 1, DFRACT_BITS); + pState--; } |