media/libstagefright/codecs/mp3dec/src/pvmp3_polyphase_filter_window.h

/* ------------------------------------------------------------------
 * 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.
 * -------------------------------------------------------------------
 */
/*
------------------------------------------------------------------------------
   PacketVideo Corp.
   MP3 Decoder Library

   Filename: pvmp3_decode_header.h

   Date: 09/21/2007

------------------------------------------------------------------------------
 REVISION HISTORY

 Description:

------------------------------------------------------------------------------
 INCLUDE DESCRIPTION

------------------------------------------------------------------------------
*/

/*----------------------------------------------------------------------------
; CONTINUE ONLY IF NOT ALREADY DEFINED
----------------------------------------------------------------------------*/
#ifndef PVMP3_POLYPHASE_FILTER_WINDOW_H
#define PVMP3_POLYPHASE_FILTER_WINDOW_H

/*----------------------------------------------------------------------------
; INCLUDES
----------------------------------------------------------------------------*/

#include "pvmp3_audio_type_defs.h"
#include "s_tmp3dec_chan.h"

/*----------------------------------------------------------------------------
; MACROS
; Define module specific macros here
----------------------------------------------------------------------------*/

/*----------------------------------------------------------------------------
; DEFINES
; Include all pre-processor statements here.
----------------------------------------------------------------------------*/
#define MAX_16BITS_INT  0x7FFF

/*----------------------------------------------------------------------------
; EXTERNAL VARIABLES REFERENCES
; Declare variables used in this module but defined elsewhere
----------------------------------------------------------------------------*/

/*----------------------------------------------------------------------------
; SIMPLE TYPEDEF'S
----------------------------------------------------------------------------*/

/*----------------------------------------------------------------------------
; ENUMERATED TYPEDEF'S
----------------------------------------------------------------------------*/

/*----------------------------------------------------------------------------
; STRUCTURES TYPEDEF'S
----------------------------------------------------------------------------*/

/*----------------------------------------------------------------------------
; GLOBAL FUNCTION DEFINITIONS
; Function Prototype declaration
----------------------------------------------------------------------------*/

#ifdef __cplusplus
extern "C"
{
#endif


#if (defined(PV_ARM_V5)||defined(PV_ARM_V4))


    __inline int16 saturate16(int32 sample)
    {
        int32 a;
        int32 b = 31;
        __asm
        {
            mov   a, sample, asr#15
            teq a, sample, asr b
            eorne sample, MAX_16BITS_INT, sample, asr#31
        }
        return sample ;
    }

#else

    inline int16 saturate16(int32 sample)
    {

        if ((sample >> 15) ^(sample >> 31))
        {
            sample = MAX_16BITS_INT ^(sample >> 31);
        }
        return sample;

    }
#endif


    void pvmp3_polyphase_filter_window(int32 *synth_buffer,
                                       int16 *outPcm,
                                       int32 numChannels);


#ifdef __cplusplus
}
#endif

/*----------------------------------------------------------------------------
; END
----------------------------------------------------------------------------*/
#endif