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Diffstat (limited to 'media/libstagefright/codecs/amrwbenc/src/scale.c')
| -rw-r--r-- | media/libstagefright/codecs/amrwbenc/src/scale.c | 57 |
1 files changed, 57 insertions, 0 deletions
diff --git a/media/libstagefright/codecs/amrwbenc/src/scale.c b/media/libstagefright/codecs/amrwbenc/src/scale.c new file mode 100644 index 0000000..418cc06 --- /dev/null +++ b/media/libstagefright/codecs/amrwbenc/src/scale.c @@ -0,0 +1,57 @@ +/* + ** 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: scale.c * +* * +* Description: Scale signal to get maximum of dynamic * +* * +************************************************************************/ + +#include "typedef.h" +#include "basic_op.h" + +void Scale_sig( + Word16 x[], /* (i/o) : signal to scale */ + Word16 lg, /* (i) : size of x[] */ + Word16 exp /* (i) : exponent: x = round(x << exp) */ + ) +{ + Word32 i; + Word32 L_tmp; + if(exp > 0) + { + for (i = lg - 1 ; i >= 0; i--) + { + L_tmp = L_shl2(x[i], 16 + exp); + x[i] = extract_h(L_add(L_tmp, 0x8000)); + } + } + else + { + exp = -exp; + for (i = lg - 1; i >= 0; i--) + { + L_tmp = x[i] << 16; + L_tmp >>= exp; + x[i] = (L_tmp + 0x8000)>>16; + } + } + return; +} + + + |