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/*
* imdct_mlib.c
* Copyright (C) 2001 Håkan Hjort <d95hjort@dtek.chalmers.se>
*
* This file is part of ac3dec, a free Dolby AC-3 stream decoder.
*
* ac3dec is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2, or (at your option)
* any later version.
*
* ac3dec is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with GNU Make; see the file COPYING. If not, write to
* the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include "config.h"
#ifdef LIBAC3_MLIB
#include <stdlib.h>
#include <stdio.h>
#include <math.h>
#include <mlib_types.h>
#include <mlib_status.h>
#include <mlib_signal.h>
extern float imdct_window[];
void
imdct_do_512_mlib(float data[], float delay[])
{
float *buf_real;
float *buf_imag;
float *data_ptr;
float *delay_ptr;
float *window_ptr;
float tmp[256] __attribute__ ((__aligned__ (16)));
int i;
memcpy(tmp, data, 256 * sizeof(float));
if(mlib_SignalIMDCT_F32(tmp) != MLIB_SUCCESS) {
fprintf(stderr, "mediaLib failure\n");
exit(-1);
}
buf_real = tmp;
buf_imag = tmp + 128;
data_ptr = data;
delay_ptr = delay;
window_ptr = imdct_window;
/* Window and convert to real valued signal */
for(i=0; i< 64; i++)
{
*data_ptr++ = 2.0f * (-buf_imag[64+i] * *window_ptr++ + *delay_ptr++);
*data_ptr++ = 2.0f * ( buf_real[64-i-1] * *window_ptr++ + *delay_ptr++);
}
for(i=0; i< 64; i++)
{
*data_ptr++ = 2.0f * (-buf_real[i] * *window_ptr++ + *delay_ptr++);
*data_ptr++ = 2.0f * ( buf_imag[128-i-1] * *window_ptr++ + *delay_ptr++);
}
/* The trailing edge of the window goes into the delay line */
delay_ptr = delay;
for(i=0; i< 64; i++)
{
*delay_ptr++ = -buf_real[64+i] * *--window_ptr;
*delay_ptr++ = buf_imag[64-i-1] * *--window_ptr;
}
for(i=0; i<64; i++)
{
*delay_ptr++ = buf_imag[i] * *--window_ptr;
*delay_ptr++ = -buf_real[128-i-1] * *--window_ptr;
}
}
void
imdct_do_256_mlib(float data[], float delay[])
{
float *buf1_real, *buf1_imag;
float *buf2_real, *buf2_imag;
float *data_ptr;
float *delay_ptr;
float *window_ptr;
float tmp[256] __attribute__ ((__aligned__ (16)));
int i;
memcpy(tmp, data, 256 * sizeof(float));
if(mlib_SignalIMDCT_F32(tmp) != MLIB_SUCCESS) {
fprintf(stderr, "mediaLib failure\n");
exit(-1);
}
buf1_real = tmp;
buf1_imag = tmp + 64;
buf2_real = tmp + 128;
buf2_imag = tmp + 128 + 64;
data_ptr = data;
delay_ptr = delay;
window_ptr = imdct_window;
/* Window and convert to real valued signal */
for(i=0; i< 64; i++)
{
*data_ptr++ = 2.0f * (-buf1_imag[i] * *window_ptr++ + *delay_ptr++);
*data_ptr++ = 2.0f * ( buf1_real[64-i-1] * *window_ptr++ + *delay_ptr++);
}
for(i=0; i< 64; i++)
{
*data_ptr++ = 2.0f * (-buf1_real[i] * *window_ptr++ + *delay_ptr++);
*data_ptr++ = 2.0f * ( buf1_imag[64-i-1] * *window_ptr++ + *delay_ptr++);
}
delay_ptr = delay;
for(i=0; i< 64; i++)
{
*delay_ptr++ = -buf2_real[i] * *--window_ptr;
*delay_ptr++ = buf2_imag[64-i-1] * *--window_ptr;
}
for(i=0; i< 64; i++)
{
*delay_ptr++ = buf2_imag[i] * *--window_ptr;
*delay_ptr++ = -buf2_real[64-i-1] * *--window_ptr;
}
}
#endif
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