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Diffstat (limited to 'media/libstagefright/codecs/amrwbenc/src/lag_wind.c')
| -rw-r--r-- | media/libstagefright/codecs/amrwbenc/src/lag_wind.c | 49 |
1 files changed, 49 insertions, 0 deletions
diff --git a/media/libstagefright/codecs/amrwbenc/src/lag_wind.c b/media/libstagefright/codecs/amrwbenc/src/lag_wind.c new file mode 100644 index 0000000..49c622c --- /dev/null +++ b/media/libstagefright/codecs/amrwbenc/src/lag_wind.c @@ -0,0 +1,49 @@ +/* + ** Copyright 2003-2010, VisualOn, Inc. + ** + ** Licensed under the Apache License, Version 2.0 (the "License"); + ** you may not use this file except in compliance with the License. + ** You may obtain a copy of the License at + ** + ** http://www.apache.org/licenses/LICENSE-2.0 + ** + ** Unless required by applicable law or agreed to in writing, software + ** distributed under the License is distributed on an "AS IS" BASIS, + ** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + ** See the License for the specific language governing permissions and + ** limitations under the License. + */ + +/*********************************************************************** +* File: lag_wind.c * +* * +* Description: Lag_windows on autocorrelations * +* r[i] *= lag_wind[i] * +* * +************************************************************************/ + +#include "typedef.h" +#include "basic_op.h" +#include "oper_32b.h" +#include "lag_wind.tab" + + +void Lag_window( + Word16 r_h[], /* (i/o) : Autocorrelations (msb) */ + Word16 r_l[] /* (i/o) : Autocorrelations (lsb) */ + ) +{ + Word32 i; + Word32 x; + + for (i = 1; i <= M; i++) + { + x = Mpy_32(r_h[i], r_l[i], volag_h[i - 1], volag_l[i - 1]); + r_h[i] = x >> 16; + r_l[i] = (x & 0xffff)>>1; + } + return; +} + + + |