mirror of https://github.com/mpv-player/mpv
139 lines
3.5 KiB
C
139 lines
3.5 KiB
C
/*
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* imdct_mlib.c
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* Copyright (C) 2000-2001 Michel Lespinasse <walken@zoy.org>
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* Copyright (C) 1999-2000 Aaron Holtzman <aholtzma@ess.engr.uvic.ca>
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*
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* This file is part of a52dec, a free ATSC A-52 stream decoder.
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* See http://liba52.sourceforge.net/ for updates.
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*
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* a52dec is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* a52dec is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include "config.h"
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#ifdef LIBA52_MLIB
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#include <mlib_types.h>
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#include <mlib_status.h>
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#include <mlib_signal.h>
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#include <string.h>
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#include <inttypes.h>
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#include "a52.h"
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#include "a52_internal.h"
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extern sample_t imdct_window[];
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void
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imdct_do_512_mlib(sample_t data[], sample_t delay[], sample_t bias)
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{
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sample_t *buf_real;
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sample_t *buf_imag;
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sample_t *data_ptr;
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sample_t *delay_ptr;
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sample_t *window_ptr;
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sample_t tmp[256] __attribute__((aligned(16)));
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int i;
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memcpy(tmp, data, 256 * sizeof(sample_t));
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mlib_SignalIMDCT_F32(tmp);
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buf_real = tmp;
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buf_imag = tmp + 128;
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data_ptr = data;
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delay_ptr = delay;
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window_ptr = imdct_window;
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/* Window and convert to real valued signal */
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for(i=0; i< 64; i++)
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{
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*data_ptr++ = -buf_imag[64+i] * *window_ptr++ + *delay_ptr++ + bias;
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*data_ptr++ = buf_real[64-i-1] * *window_ptr++ + *delay_ptr++ + bias;
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}
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for(i=0; i< 64; i++)
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{
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*data_ptr++ = -buf_real[i] * *window_ptr++ + *delay_ptr++ + bias;
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*data_ptr++ = buf_imag[128-i-1] * *window_ptr++ + *delay_ptr++ + bias;
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}
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/* The trailing edge of the window goes into the delay line */
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delay_ptr = delay;
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for(i=0; i< 64; i++)
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{
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*delay_ptr++ = -buf_real[64+i] * *--window_ptr;
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*delay_ptr++ = buf_imag[64-i-1] * *--window_ptr;
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}
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for(i=0; i<64; i++)
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{
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*delay_ptr++ = buf_imag[i] * *--window_ptr;
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*delay_ptr++ = -buf_real[128-i-1] * *--window_ptr;
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}
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}
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void
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imdct_do_256_mlib(sample_t data[], sample_t delay[], sample_t bias)
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{
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sample_t *buf1_real, *buf1_imag;
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sample_t *buf2_real, *buf2_imag;
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sample_t *data_ptr;
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sample_t *delay_ptr;
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sample_t *window_ptr;
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sample_t tmp[256] __attribute__((aligned(16)));
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int i;
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memcpy(tmp, data, 256 * sizeof(sample_t));
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mlib_SignalIMDCTSplit_F32(tmp);
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buf1_real = tmp;
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buf1_imag = tmp + 128 + 64;
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buf2_real = tmp + 64;
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buf2_imag = tmp + 128;
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data_ptr = data;
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delay_ptr = delay;
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window_ptr = imdct_window;
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/* Window and convert to real valued signal */
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for(i=0; i< 64; i++)
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{
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*data_ptr++ = -buf1_imag[i] * *window_ptr++ + *delay_ptr++ + bias;
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*data_ptr++ = buf1_real[64-i-1] * *window_ptr++ + *delay_ptr++ + bias;
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}
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for(i=0; i< 64; i++)
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{
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*data_ptr++ = -buf1_real[i] * *window_ptr++ + *delay_ptr++ + bias;
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*data_ptr++ = buf1_imag[64-i-1] * *window_ptr++ + *delay_ptr++ + bias;
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}
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delay_ptr = delay;
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for(i=0; i< 64; i++)
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{
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*delay_ptr++ = -buf2_real[i] * *--window_ptr;
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*delay_ptr++ = buf2_imag[64-i-1] * *--window_ptr;
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}
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for(i=0; i< 64; i++)
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{
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*delay_ptr++ = buf2_imag[i] * *--window_ptr;
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*delay_ptr++ = -buf2_real[64-i-1] * *--window_ptr;
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}
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}
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#endif
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