diff options
Diffstat (limited to 'media/libstagefright/codecs/amrwbenc/src/preemph.c')
| -rw-r--r-- | media/libstagefright/codecs/amrwbenc/src/preemph.c | 88 |
1 files changed, 0 insertions, 88 deletions
diff --git a/media/libstagefright/codecs/amrwbenc/src/preemph.c b/media/libstagefright/codecs/amrwbenc/src/preemph.c deleted file mode 100644 index c867bf7..0000000 --- a/media/libstagefright/codecs/amrwbenc/src/preemph.c +++ /dev/null @@ -1,88 +0,0 @@ -/* - ** 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: preemph.c * -* * -* Description: Preemphasis: filtering through 1 - g z^-1 * -* Preemph2 --> signal is multiplied by 2 * -* * -************************************************************************/ - -#include "typedef.h" -#include "basic_op.h" - -void Preemph( - Word16 x[], /* (i/o) : input signal overwritten by the output */ - Word16 mu, /* (i) Q15 : preemphasis coefficient */ - Word16 lg, /* (i) : lenght of filtering */ - Word16 * mem /* (i/o) : memory (x[-1]) */ - ) -{ - Word16 temp; - Word32 i, L_tmp; - - temp = x[lg - 1]; - - for (i = lg - 1; i > 0; i--) - { - L_tmp = L_deposit_h(x[i]); - L_tmp -= (x[i - 1] * mu)<<1; - x[i] = (L_tmp + 0x8000)>>16; - } - - L_tmp = L_deposit_h(x[0]); - L_tmp -= ((*mem) * mu)<<1; - x[0] = (L_tmp + 0x8000)>>16; - - *mem = temp; - - return; -} - - -void Preemph2( - Word16 x[], /* (i/o) : input signal overwritten by the output */ - Word16 mu, /* (i) Q15 : preemphasis coefficient */ - Word16 lg, /* (i) : lenght of filtering */ - Word16 * mem /* (i/o) : memory (x[-1]) */ - ) -{ - Word16 temp; - Word32 i, L_tmp; - - temp = x[lg - 1]; - - for (i = (Word16) (lg - 1); i > 0; i--) - { - L_tmp = L_deposit_h(x[i]); - L_tmp -= (x[i - 1] * mu)<<1; - L_tmp = (L_tmp << 1); - x[i] = (L_tmp + 0x8000)>>16; - } - - L_tmp = L_deposit_h(x[0]); - L_tmp -= ((*mem) * mu)<<1; - L_tmp = (L_tmp << 1); - x[0] = (L_tmp + 0x8000)>>16; - - *mem = temp; - - return; -} - - - |