diff options
Diffstat (limited to 'media/libstagefright/codecs/aacdec/pv_pow2.cpp')
-rw-r--r-- | media/libstagefright/codecs/aacdec/pv_pow2.cpp | 170 |
1 files changed, 0 insertions, 170 deletions
diff --git a/media/libstagefright/codecs/aacdec/pv_pow2.cpp b/media/libstagefright/codecs/aacdec/pv_pow2.cpp deleted file mode 100644 index 8dfca23..0000000 --- a/media/libstagefright/codecs/aacdec/pv_pow2.cpp +++ /dev/null @@ -1,170 +0,0 @@ -/* ------------------------------------------------------------------ - * Copyright (C) 1998-2009 PacketVideo - * - * 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. - * ------------------------------------------------------------------- - */ -/* - - Filename: pv_pow2.c - - ------------------------------------------------------------------------------- - REVISION HISTORY - - - Who: Date: MM/DD/YYYY - Description: - ------------------------------------------------------------------------------- - INPUT AND OUTPUT DEFINITIONS - -Input - Int32 x 32-bit integer input Q27 - -Output - Int32 32-bit integer in Q25 - - ------------------------------------------------------------------------------- - FUNCTION DESCRIPTION - - Implement the power base 2 for positive numbers lesser than 5.999999 ------------------------------------------------------------------------------- - REQUIREMENTS - - ------------------------------------------------------------------------------- - REFERENCES - ------------------------------------------------------------------------------- - PSEUDO-CODE - ------------------------------------------------------------------------------- -*/ -#ifdef AAC_PLUS - -/*---------------------------------------------------------------------------- -; INCLUDES -----------------------------------------------------------------------------*/ -#include "pv_pow2.h" -#include "fxp_mul32.h" - -/*---------------------------------------------------------------------------- -; MACROS -; Define module specific macros here -----------------------------------------------------------------------------*/ - - -/*---------------------------------------------------------------------------- -; DEFINES -; Include all pre-processor statements here. Include conditional -; compile variables also. -----------------------------------------------------------------------------*/ - -/*---------------------------------------------------------------------------- -; LOCAL FUNCTION DEFINITIONS -; Function Prototype declaration -----------------------------------------------------------------------------*/ -#define POW_2_TABLE_LENGTH 6 -#define POW_2_TABLE_LENGTH_m_2 (POW_2_TABLE_LENGTH - 2) - -/*---------------------------------------------------------------------------- -; LOCAL STORE/BUFFER/POINTER DEFINITIONS -; Variable declaration - defined here and used outside this module -----------------------------------------------------------------------------*/ - -#define R_SHIFT 29 -#define Q_fmt(x) (Int32)(x*((Int32)1<<R_SHIFT) + (x>=0?0.5F:-0.5F)) - -#define Q27fmt(x) (Int32)(x*((Int32)1<<27) + (x>=0?0.5F:-0.5F)) - -const Int32 pow2_table[6] = -{ - Q_fmt(0.00224510927441F), Q_fmt(0.00777943379416F), - Q_fmt(0.05737929218747F), Q_fmt(0.23918017179889F), - Q_fmt(0.69345251849351F), Q_fmt(0.99996347120248F) -}; - - -/*---------------------------------------------------------------------------- -; EXTERNAL FUNCTION REFERENCES -; Declare functions defined elsewhere and referenced in this module -----------------------------------------------------------------------------*/ - -/*---------------------------------------------------------------------------- -; EXTERNAL GLOBAL STORE/BUFFER/POINTER REFERENCES -; Declare variables used in this module but defined elsewhere -----------------------------------------------------------------------------*/ - -/*---------------------------------------------------------------------------- -; FUNCTION CODE -----------------------------------------------------------------------------*/ - - -/* - * z in Q27 format - */ - -Int32 pv_pow2(Int32 z) -{ - const Int32 *pt_table = pow2_table; - Int32 multiplier = 0; - Int32 shift_factor; - Int32 i; - Int32 v_q; - Int32 y; - - - if (z > Q27fmt(1.0f)) - { - v_q = z - (z & 0xF8000000); - shift_factor = z >> 27; - } - else - { - v_q = z; - shift_factor = 0; - } - - if (v_q < Q27fmt(0.5f)) - { - v_q += Q27fmt(0.5f); - multiplier = Q_fmt(0.70710678118655F); - } - - v_q = v_q << 2; - - y = fxp_mul32_Q29(*(pt_table++), v_q); - - for (i = POW_2_TABLE_LENGTH_m_2; i != 0; i--) - { - y += *(pt_table++); - y = fxp_mul32_Q29(y, v_q); - } - y += *(pt_table++); - - if (multiplier) - { - y = fxp_mul32_Q29(y, multiplier); - } - - /* - * returns number on Q25 - */ - return (y >> (4 - shift_factor)); - -} - -#endif |