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/*
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* Copyright (c) 2012
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* MIPS Technologies, Inc., California.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the MIPS Technologies, Inc., nor the names of its
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* contributors may be used to endorse or promote products derived from
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* this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE MIPS TECHNOLOGIES, INC. ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE MIPS TECHNOLOGIES, INC. BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* Author: Stanislav Ocovaj (socovaj@mips.com)
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* Author: Zoran Lukic (zoranl@mips.com)
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*
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* Optimized MDCT/IMDCT and FFT transforms
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg 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 GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include "config.h"
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#include "libavcodec/fft.h"
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#include "libavcodec/fft_table.h"
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#include "libavutil/mips/asmdefs.h"
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/**
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* FFT transform
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*/
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#if HAVE_INLINE_ASM
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static void ff_fft_calc_mips(FFTContext *s, FFTComplex *z)
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{
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int nbits, i, n, num_transforms, offset, step;
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int n4, n2, n34;
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FFTSample tmp1, tmp2, tmp3, tmp4, tmp5, tmp6, tmp7, tmp8;
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FFTComplex *tmpz;
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float w_re, w_im;
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float *w_re_ptr, *w_im_ptr;
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const int fft_size = (1 << s->nbits);
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float pom, pom1, pom2, pom3;
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float temp, temp1, temp3, temp4;
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FFTComplex * tmpz_n2, * tmpz_n34, * tmpz_n4;
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FFTComplex * tmpz_n2_i, * tmpz_n34_i, * tmpz_n4_i, * tmpz_i;
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num_transforms = (0x2aab >> (16 - s->nbits)) | 1;
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for (n=0; n<num_transforms; n++) {
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offset = ff_fft_offsets_lut[n] << 2;
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tmpz = z + offset;
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tmp1 = tmpz[0].re + tmpz[1].re;
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tmp5 = tmpz[2].re + tmpz[3].re;
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tmp2 = tmpz[0].im + tmpz[1].im;
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tmp6 = tmpz[2].im + tmpz[3].im;
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tmp3 = tmpz[0].re - tmpz[1].re;
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tmp8 = tmpz[2].im - tmpz[3].im;
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tmp4 = tmpz[0].im - tmpz[1].im;
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tmp7 = tmpz[2].re - tmpz[3].re;
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tmpz[0].re = tmp1 + tmp5;
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tmpz[2].re = tmp1 - tmp5;
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tmpz[0].im = tmp2 + tmp6;
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tmpz[2].im = tmp2 - tmp6;
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tmpz[1].re = tmp3 + tmp8;
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tmpz[3].re = tmp3 - tmp8;
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tmpz[1].im = tmp4 - tmp7;
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tmpz[3].im = tmp4 + tmp7;
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}
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if (fft_size < 8)
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return;
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num_transforms = (num_transforms >> 1) | 1;
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for (n=0; n<num_transforms; n++) {
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offset = ff_fft_offsets_lut[n] << 3;
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tmpz = z + offset;
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__asm__ volatile (
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"lwc1 %[tmp1], 32(%[tmpz]) \n\t"
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"lwc1 %[pom], 40(%[tmpz]) \n\t"
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"lwc1 %[tmp3], 48(%[tmpz]) \n\t"
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"lwc1 %[pom1], 56(%[tmpz]) \n\t"
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"lwc1 %[tmp2], 36(%[tmpz]) \n\t"
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"lwc1 %[pom2], 44(%[tmpz]) \n\t"
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"lwc1 %[pom3], 60(%[tmpz]) \n\t"
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"lwc1 %[tmp4], 52(%[tmpz]) \n\t"
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"add.s %[tmp1], %[tmp1], %[pom] \n\t" // tmp1 = tmpz[4].re + tmpz[5].re;
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"add.s %[tmp3], %[tmp3], %[pom1] \n\t" // tmp3 = tmpz[6].re + tmpz[7].re;
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"add.s %[tmp2], %[tmp2], %[pom2] \n\t" // tmp2 = tmpz[4].im + tmpz[5].im;
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"lwc1 %[pom], 40(%[tmpz]) \n\t"
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"add.s %[tmp4], %[tmp4], %[pom3] \n\t" // tmp4 = tmpz[6].im + tmpz[7].im;
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"add.s %[tmp5], %[tmp1], %[tmp3] \n\t" // tmp5 = tmp1 + tmp3;
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"sub.s %[tmp7], %[tmp1], %[tmp3] \n\t" // tmp7 = tmp1 - tmp3;
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"lwc1 %[tmp1], 32(%[tmpz]) \n\t"
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"lwc1 %[pom1], 44(%[tmpz]) \n\t"
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"add.s %[tmp6], %[tmp2], %[tmp4] \n\t" // tmp6 = tmp2 + tmp4;
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"sub.s %[tmp8], %[tmp2], %[tmp4] \n\t" // tmp8 = tmp2 - tmp4;
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"lwc1 %[tmp2], 36(%[tmpz]) \n\t"
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"lwc1 %[pom2], 56(%[tmpz]) \n\t"
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"lwc1 %[pom3], 60(%[tmpz]) \n\t"
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"lwc1 %[tmp3], 48(%[tmpz]) \n\t"
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"lwc1 %[tmp4], 52(%[tmpz]) \n\t"
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"sub.s %[tmp1], %[tmp1], %[pom] \n\t" // tmp1 = tmpz[4].re - tmpz[5].re;
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"lwc1 %[pom], 0(%[tmpz]) \n\t"
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"sub.s %[tmp2], %[tmp2], %[pom1] \n\t" // tmp2 = tmpz[4].im - tmpz[5].im;
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"sub.s %[tmp3], %[tmp3], %[pom2] \n\t" // tmp3 = tmpz[6].re - tmpz[7].re;
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"lwc1 %[pom2], 4(%[tmpz]) \n\t"
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"sub.s %[pom1], %[pom], %[tmp5] \n\t"
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"sub.s %[tmp4], %[tmp4], %[pom3] \n\t" // tmp4 = tmpz[6].im - tmpz[7].im;
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"add.s %[pom3], %[pom], %[tmp5] \n\t"
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"sub.s %[pom], %[pom2], %[tmp6] \n\t"
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"add.s %[pom2], %[pom2], %[tmp6] \n\t"
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"swc1 %[pom1], 32(%[tmpz]) \n\t" // tmpz[4].re = tmpz[0].re - tmp5;
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"swc1 %[pom3], 0(%[tmpz]) \n\t" // tmpz[0].re = tmpz[0].re + tmp5;
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"swc1 %[pom], 36(%[tmpz]) \n\t" // tmpz[4].im = tmpz[0].im - tmp6;
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"swc1 %[pom2], 4(%[tmpz]) \n\t" // tmpz[0].im = tmpz[0].im + tmp6;
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"lwc1 %[pom1], 16(%[tmpz]) \n\t"
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"lwc1 %[pom3], 20(%[tmpz]) \n\t"
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"li.s %[pom], 0.7071067812 \n\t" // float pom = 0.7071067812f;
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"add.s %[temp1],%[tmp1], %[tmp2] \n\t"
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"sub.s %[temp], %[pom1], %[tmp8] \n\t"
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"add.s %[pom2], %[pom3], %[tmp7] \n\t"
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"sub.s %[temp3],%[tmp3], %[tmp4] \n\t"
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"sub.s %[temp4],%[tmp2], %[tmp1] \n\t"
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"swc1 %[temp], 48(%[tmpz]) \n\t" // tmpz[6].re = tmpz[2].re - tmp8;
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"swc1 %[pom2], 52(%[tmpz]) \n\t" // tmpz[6].im = tmpz[2].im + tmp7;
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"add.s %[pom1], %[pom1], %[tmp8] \n\t"
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"sub.s %[pom3], %[pom3], %[tmp7] \n\t"
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"add.s %[tmp3], %[tmp3], %[tmp4] \n\t"
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"mul.s %[tmp5], %[pom], %[temp1] \n\t" // tmp5 = pom * (tmp1 + tmp2);
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"mul.s %[tmp7], %[pom], %[temp3] \n\t" // tmp7 = pom * (tmp3 - tmp4);
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"mul.s %[tmp6], %[pom], %[temp4] \n\t" // tmp6 = pom * (tmp2 - tmp1);
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"mul.s %[tmp8], %[pom], %[tmp3] \n\t" // tmp8 = pom * (tmp3 + tmp4);
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"swc1 %[pom1], 16(%[tmpz]) \n\t" // tmpz[2].re = tmpz[2].re + tmp8;
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"swc1 %[pom3], 20(%[tmpz]) \n\t" // tmpz[2].im = tmpz[2].im - tmp7;
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"add.s %[tmp1], %[tmp5], %[tmp7] \n\t" // tmp1 = tmp5 + tmp7;
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"sub.s %[tmp3], %[tmp5], %[tmp7] \n\t" // tmp3 = tmp5 - tmp7;
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"add.s %[tmp2], %[tmp6], %[tmp8] \n\t" // tmp2 = tmp6 + tmp8;
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"sub.s %[tmp4], %[tmp6], %[tmp8] \n\t" // tmp4 = tmp6 - tmp8;
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"lwc1 %[temp], 8(%[tmpz]) \n\t"
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"lwc1 %[temp1],12(%[tmpz]) \n\t"
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"lwc1 %[pom], 24(%[tmpz]) \n\t"
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"lwc1 %[pom2], 28(%[tmpz]) \n\t"
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"sub.s %[temp4],%[temp], %[tmp1] \n\t"
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"sub.s %[temp3],%[temp1], %[tmp2] \n\t"
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"add.s %[temp], %[temp], %[tmp1] \n\t"
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"add.s %[temp1],%[temp1], %[tmp2] \n\t"
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"sub.s %[pom1], %[pom], %[tmp4] \n\t"
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"add.s %[pom3], %[pom2], %[tmp3] \n\t"
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"add.s %[pom], %[pom], %[tmp4] \n\t"
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"sub.s %[pom2], %[pom2], %[tmp3] \n\t"
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"swc1 %[temp4],40(%[tmpz]) \n\t" // tmpz[5].re = tmpz[1].re - tmp1;
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"swc1 %[temp3],44(%[tmpz]) \n\t" // tmpz[5].im = tmpz[1].im - tmp2;
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"swc1 %[temp], 8(%[tmpz]) \n\t" // tmpz[1].re = tmpz[1].re + tmp1;
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"swc1 %[temp1],12(%[tmpz]) \n\t" // tmpz[1].im = tmpz[1].im + tmp2;
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"swc1 %[pom1], 56(%[tmpz]) \n\t" // tmpz[7].re = tmpz[3].re - tmp4;
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"swc1 %[pom3], 60(%[tmpz]) \n\t" // tmpz[7].im = tmpz[3].im + tmp3;
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"swc1 %[pom], 24(%[tmpz]) \n\t" // tmpz[3].re = tmpz[3].re + tmp4;
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"swc1 %[pom2], 28(%[tmpz]) \n\t" // tmpz[3].im = tmpz[3].im - tmp3;
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: [tmp1]"=&f"(tmp1), [pom]"=&f"(pom), [pom1]"=&f"(pom1), [pom2]"=&f"(pom2),
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[tmp3]"=&f"(tmp3), [tmp2]"=&f"(tmp2), [tmp4]"=&f"(tmp4), [tmp5]"=&f"(tmp5), [tmp7]"=&f"(tmp7),
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[tmp6]"=&f"(tmp6), [tmp8]"=&f"(tmp8), [pom3]"=&f"(pom3),[temp]"=&f"(temp), [temp1]"=&f"(temp1),
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[temp3]"=&f"(temp3), [temp4]"=&f"(temp4)
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: [tmpz]"r"(tmpz)
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: "memory"
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);
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}
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step = 1 << (MAX_LOG2_NFFT - 4);
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n4 = 4;
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for (nbits=4; nbits<=s->nbits; nbits++) {
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num_transforms = (num_transforms >> 1) | 1;
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n2 = 2 * n4;
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n34 = 3 * n4;
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for (n=0; n<num_transforms; n++) {
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offset = ff_fft_offsets_lut[n] << nbits;
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tmpz = z + offset;
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tmpz_n2 = tmpz + n2;
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tmpz_n4 = tmpz + n4;
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tmpz_n34 = tmpz + n34;
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__asm__ volatile (
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"lwc1 %[pom1], 0(%[tmpz_n2]) \n\t"
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"lwc1 %[pom], 0(%[tmpz_n34]) \n\t"
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"lwc1 %[pom2], 4(%[tmpz_n2]) \n\t"
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"lwc1 %[pom3], 4(%[tmpz_n34]) \n\t"
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"lwc1 %[temp1],0(%[tmpz]) \n\t"
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"lwc1 %[temp3],4(%[tmpz]) \n\t"
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"add.s %[tmp5], %[pom1], %[pom] \n\t" // tmp5 = tmpz[ n2].re + tmpz[n34].re;
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"sub.s %[tmp1], %[pom1], %[pom] \n\t" // tmp1 = tmpz[ n2].re - tmpz[n34].re;
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"add.s %[tmp6], %[pom2], %[pom3] \n\t" // tmp6 = tmpz[ n2].im + tmpz[n34].im;
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"sub.s %[tmp2], %[pom2], %[pom3] \n\t" // tmp2 = tmpz[ n2].im - tmpz[n34].im;
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"sub.s %[temp], %[temp1], %[tmp5] \n\t"
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"add.s %[temp1],%[temp1], %[tmp5] \n\t"
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"sub.s %[temp4],%[temp3], %[tmp6] \n\t"
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"add.s %[temp3],%[temp3], %[tmp6] \n\t"
|
|
|
|
|
"swc1 %[temp], 0(%[tmpz_n2]) \n\t" // tmpz[ n2].re = tmpz[ 0].re - tmp5;
|
|
|
|
|
"swc1 %[temp1],0(%[tmpz]) \n\t" // tmpz[ 0].re = tmpz[ 0].re + tmp5;
|
|
|
|
|
"lwc1 %[pom1], 0(%[tmpz_n4]) \n\t"
|
|
|
|
|
"swc1 %[temp4],4(%[tmpz_n2]) \n\t" // tmpz[ n2].im = tmpz[ 0].im - tmp6;
|
|
|
|
|
"lwc1 %[temp], 4(%[tmpz_n4]) \n\t"
|
|
|
|
|
"swc1 %[temp3],4(%[tmpz]) \n\t" // tmpz[ 0].im = tmpz[ 0].im + tmp6;
|
|
|
|
|
"sub.s %[pom], %[pom1], %[tmp2] \n\t"
|
|
|
|
|
"add.s %[pom1], %[pom1], %[tmp2] \n\t"
|
|
|
|
|
"add.s %[temp1],%[temp], %[tmp1] \n\t"
|
|
|
|
|
"sub.s %[temp], %[temp], %[tmp1] \n\t"
|
|
|
|
|
"swc1 %[pom], 0(%[tmpz_n34]) \n\t" // tmpz[n34].re = tmpz[n4].re - tmp2;
|
|
|
|
|
"swc1 %[pom1], 0(%[tmpz_n4]) \n\t" // tmpz[ n4].re = tmpz[n4].re + tmp2;
|
|
|
|
|
"swc1 %[temp1],4(%[tmpz_n34]) \n\t" // tmpz[n34].im = tmpz[n4].im + tmp1;
|
|
|
|
|
"swc1 %[temp], 4(%[tmpz_n4]) \n\t" // tmpz[ n4].im = tmpz[n4].im - tmp1;
|
|
|
|
|
: [tmp5]"=&f"(tmp5),
|
|
|
|
|
[tmp1]"=&f"(tmp1), [pom]"=&f"(pom), [pom1]"=&f"(pom1), [pom2]"=&f"(pom2),
|
|
|
|
|
[tmp2]"=&f"(tmp2), [tmp6]"=&f"(tmp6), [pom3]"=&f"(pom3),
|
|
|
|
|
[temp]"=&f"(temp), [temp1]"=&f"(temp1), [temp3]"=&f"(temp3), [temp4]"=&f"(temp4)
|
|
|
|
|
: [tmpz]"r"(tmpz), [tmpz_n2]"r"(tmpz_n2), [tmpz_n34]"r"(tmpz_n34), [tmpz_n4]"r"(tmpz_n4)
|
|
|
|
|
: "memory"
|
|
|
|
|
);
|
|
|
|
|
|
|
|
|
|
w_re_ptr = (float*)(ff_cos_65536 + step);
|
|
|
|
|
w_im_ptr = (float*)(ff_cos_65536 + MAX_FFT_SIZE/4 - step);
|
|
|
|
|
|
|
|
|
|
for (i=1; i<n4; i++) {
|
|
|
|
|
w_re = w_re_ptr[0];
|
|
|
|
|
w_im = w_im_ptr[0];
|
|
|
|
|
tmpz_n2_i = tmpz_n2 + i;
|
|
|
|
|
tmpz_n4_i = tmpz_n4 + i;
|
|
|
|
|
tmpz_n34_i= tmpz_n34 + i;
|
|
|
|
|
tmpz_i = tmpz + i;
|
|
|
|
|
|
|
|
|
|
__asm__ volatile (
|
|
|
|
|
"lwc1 %[temp], 0(%[tmpz_n2_i]) \n\t"
|
|
|
|
|
"lwc1 %[temp1], 4(%[tmpz_n2_i]) \n\t"
|
|
|
|
|
"lwc1 %[pom], 0(%[tmpz_n34_i]) \n\t"
|
|
|
|
|
"lwc1 %[pom1], 4(%[tmpz_n34_i]) \n\t"
|
|
|
|
|
"mul.s %[temp3], %[w_im], %[temp] \n\t"
|
|
|
|
|
"mul.s %[temp4], %[w_im], %[temp1] \n\t"
|
|
|
|
|
"mul.s %[pom2], %[w_im], %[pom1] \n\t"
|
|
|
|
|
"mul.s %[pom3], %[w_im], %[pom] \n\t"
|
|
|
|
|
"msub.s %[tmp2], %[temp3], %[w_re], %[temp1] \n\t" // tmp2 = w_re * tmpz[ n2+i].im - w_im * tmpz[ n2+i].re;
|
|
|
|
|
"madd.s %[tmp1], %[temp4], %[w_re], %[temp] \n\t" // tmp1 = w_re * tmpz[ n2+i].re + w_im * tmpz[ n2+i].im;
|
|
|
|
|
"msub.s %[tmp3], %[pom2], %[w_re], %[pom] \n\t" // tmp3 = w_re * tmpz[n34+i].re - w_im * tmpz[n34+i].im;
|
|
|
|
|
"madd.s %[tmp4], %[pom3], %[w_re], %[pom1] \n\t" // tmp4 = w_re * tmpz[n34+i].im + w_im * tmpz[n34+i].re;
|
|
|
|
|
"lwc1 %[temp], 0(%[tmpz_i]) \n\t"
|
|
|
|
|
"lwc1 %[pom], 4(%[tmpz_i]) \n\t"
|
|
|
|
|
"add.s %[tmp5], %[tmp1], %[tmp3] \n\t" // tmp5 = tmp1 + tmp3;
|
|
|
|
|
"sub.s %[tmp1], %[tmp1], %[tmp3] \n\t" // tmp1 = tmp1 - tmp3;
|
|
|
|
|
"add.s %[tmp6], %[tmp2], %[tmp4] \n\t" // tmp6 = tmp2 + tmp4;
|
|
|
|
|
"sub.s %[tmp2], %[tmp2], %[tmp4] \n\t" // tmp2 = tmp2 - tmp4;
|
|
|
|
|
"sub.s %[temp1], %[temp], %[tmp5] \n\t"
|
|
|
|
|
"add.s %[temp], %[temp], %[tmp5] \n\t"
|
|
|
|
|
"sub.s %[pom1], %[pom], %[tmp6] \n\t"
|
|
|
|
|
"add.s %[pom], %[pom], %[tmp6] \n\t"
|
|
|
|
|
"lwc1 %[temp3], 0(%[tmpz_n4_i]) \n\t"
|
|
|
|
|
"lwc1 %[pom2], 4(%[tmpz_n4_i]) \n\t"
|
|
|
|
|
"swc1 %[temp1], 0(%[tmpz_n2_i]) \n\t" // tmpz[ n2+i].re = tmpz[ i].re - tmp5;
|
|
|
|
|
"swc1 %[temp], 0(%[tmpz_i]) \n\t" // tmpz[ i].re = tmpz[ i].re + tmp5;
|
|
|
|
|
"swc1 %[pom1], 4(%[tmpz_n2_i]) \n\t" // tmpz[ n2+i].im = tmpz[ i].im - tmp6;
|
|
|
|
|
"swc1 %[pom] , 4(%[tmpz_i]) \n\t" // tmpz[ i].im = tmpz[ i].im + tmp6;
|
|
|
|
|
"sub.s %[temp4], %[temp3], %[tmp2] \n\t"
|
|
|
|
|
"add.s %[pom3], %[pom2], %[tmp1] \n\t"
|
|
|
|
|
"add.s %[temp3], %[temp3], %[tmp2] \n\t"
|
|
|
|
|
"sub.s %[pom2], %[pom2], %[tmp1] \n\t"
|
|
|
|
|
"swc1 %[temp4], 0(%[tmpz_n34_i]) \n\t" // tmpz[n34+i].re = tmpz[n4+i].re - tmp2;
|
|
|
|
|
"swc1 %[pom3], 4(%[tmpz_n34_i]) \n\t" // tmpz[n34+i].im = tmpz[n4+i].im + tmp1;
|
|
|
|
|
"swc1 %[temp3], 0(%[tmpz_n4_i]) \n\t" // tmpz[ n4+i].re = tmpz[n4+i].re + tmp2;
|
|
|
|
|
"swc1 %[pom2], 4(%[tmpz_n4_i]) \n\t" // tmpz[ n4+i].im = tmpz[n4+i].im - tmp1;
|
|
|
|
|
: [tmp1]"=&f"(tmp1), [tmp2]"=&f" (tmp2), [temp]"=&f"(temp), [tmp3]"=&f"(tmp3),
|
|
|
|
|
[tmp4]"=&f"(tmp4), [tmp5]"=&f"(tmp5), [tmp6]"=&f"(tmp6),
|
|
|
|
|
[temp1]"=&f"(temp1), [temp3]"=&f"(temp3), [temp4]"=&f"(temp4),
|
|
|
|
|
[pom]"=&f"(pom), [pom1]"=&f"(pom1), [pom2]"=&f"(pom2), [pom3]"=&f"(pom3)
|
|
|
|
|
: [w_re]"f"(w_re), [w_im]"f"(w_im),
|
|
|
|
|
[tmpz_i]"r"(tmpz_i),[tmpz_n2_i]"r"(tmpz_n2_i),
|
|
|
|
|
[tmpz_n34_i]"r"(tmpz_n34_i), [tmpz_n4_i]"r"(tmpz_n4_i)
|
|
|
|
|
: "memory"
|
|
|
|
|
);
|
|
|
|
|
w_re_ptr += step;
|
|
|
|
|
w_im_ptr -= step;
|
|
|
|
|
}
|
|
|
|
|
}
|
|
|
|
|
step >>= 1;
|
|
|
|
|
n4 <<= 1;
|
|
|
|
|
}
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
/**
|
|
|
|
|
* MDCT/IMDCT transforms.
|
|
|
|
|
*/
|
|
|
|
|
|
|
|
|
|
static void ff_imdct_half_mips(FFTContext *s, FFTSample *output, const FFTSample *input)
|
|
|
|
|
{
|
|
|
|
|
int k, n8, n4, n2, n, j;
|
|
|
|
|
const uint16_t *revtab = s->revtab;
|
|
|
|
|
const FFTSample *tcos = s->tcos;
|
|
|
|
|
const FFTSample *tsin = s->tsin;
|
|
|
|
|
const FFTSample *in1, *in2, *in3, *in4;
|
|
|
|
|
FFTComplex *z = (FFTComplex *)output;
|
|
|
|
|
|
|
|
|
|
int j1;
|
|
|
|
|
const float *tcos1, *tsin1, *tcos2, *tsin2;
|
|
|
|
|
float temp1, temp2, temp3, temp4, temp5, temp6, temp7, temp8,
|
|
|
|
|
temp9, temp10, temp11, temp12, temp13, temp14, temp15, temp16;
|
|
|
|
|
FFTComplex *z1, *z2;
|
|
|
|
|
|
|
|
|
|
n = 1 << s->mdct_bits;
|
|
|
|
|
n2 = n >> 1;
|
|
|
|
|
n4 = n >> 2;
|
|
|
|
|
n8 = n >> 3;
|
|
|
|
|
|
|
|
|
|
/* pre rotation */
|
|
|
|
|
in1 = input;
|
|
|
|
|
in2 = input + n2 - 1;
|
|
|
|
|
in3 = input + 2;
|
|
|
|
|
in4 = input + n2 - 3;
|
|
|
|
|
|
|
|
|
|
tcos1 = tcos;
|
|
|
|
|
tsin1 = tsin;
|
|
|
|
|
|
|
|
|
|
/* n4 = 64 or 128 */
|
|
|
|
|
for(k = 0; k < n4; k += 2) {
|
|
|
|
|
j = revtab[k ];
|
|
|
|
|
j1 = revtab[k + 1];
|
|
|
|
|
|
|
|
|
|
__asm__ volatile (
|
|
|
|
|
"lwc1 %[temp1], 0(%[in2]) \t\n"
|
|
|
|
|
"lwc1 %[temp2], 0(%[tcos1]) \t\n"
|
|
|
|
|
"lwc1 %[temp3], 0(%[tsin1]) \t\n"
|
|
|
|
|
"lwc1 %[temp4], 0(%[in1]) \t\n"
|
|
|
|
|
"lwc1 %[temp5], 0(%[in4]) \t\n"
|
|
|
|
|
"mul.s %[temp9], %[temp1], %[temp2] \t\n"
|
|
|
|
|
"mul.s %[temp10], %[temp1], %[temp3] \t\n"
|
|
|
|
|
"lwc1 %[temp6], 4(%[tcos1]) \t\n"
|
|
|
|
|
"lwc1 %[temp7], 4(%[tsin1]) \t\n"
|
|
|
|
|
"nmsub.s %[temp9], %[temp9], %[temp4], %[temp3] \t\n"
|
|
|
|
|
"madd.s %[temp10], %[temp10], %[temp4], %[temp2] \t\n"
|
|
|
|
|
"mul.s %[temp11], %[temp5], %[temp6] \t\n"
|
|
|
|
|
"mul.s %[temp12], %[temp5], %[temp7] \t\n"
|
|
|
|
|
"lwc1 %[temp8], 0(%[in3]) \t\n"
|
|
|
|
|
PTR_ADDIU " %[tcos1], %[tcos1], 8 \t\n"
|
|
|
|
|
PTR_ADDIU " %[tsin1], %[tsin1], 8 \t\n"
|
|
|
|
|
PTR_ADDIU " %[in1], %[in1], 16 \t\n"
|
|
|
|
|
"nmsub.s %[temp11], %[temp11], %[temp8], %[temp7] \t\n"
|
|
|
|
|
"madd.s %[temp12], %[temp12], %[temp8], %[temp6] \t\n"
|
|
|
|
|
PTR_ADDIU " %[in2], %[in2], -16 \t\n"
|
|
|
|
|
PTR_ADDIU " %[in3], %[in3], 16 \t\n"
|
|
|
|
|
PTR_ADDIU " %[in4], %[in4], -16 \t\n"
|
|
|
|
|
|
|
|
|
|
: [temp1]"=&f"(temp1), [temp2]"=&f"(temp2),
|
|
|
|
|
[temp3]"=&f"(temp3), [temp4]"=&f"(temp4),
|
|
|
|
|
[temp5]"=&f"(temp5), [temp6]"=&f"(temp6),
|
|
|
|
|
[temp7]"=&f"(temp7), [temp8]"=&f"(temp8),
|
|
|
|
|
[temp9]"=&f"(temp9), [temp10]"=&f"(temp10),
|
|
|
|
|
[temp11]"=&f"(temp11), [temp12]"=&f"(temp12),
|
|
|
|
|
[tsin1]"+r"(tsin1), [tcos1]"+r"(tcos1),
|
|
|
|
|
[in1]"+r"(in1), [in2]"+r"(in2),
|
|
|
|
|
[in3]"+r"(in3), [in4]"+r"(in4)
|
|
|
|
|
:
|
|
|
|
|
: "memory"
|
|
|
|
|
);
|
|
|
|
|
|
|
|
|
|
z[j ].re = temp9;
|
|
|
|
|
z[j ].im = temp10;
|
|
|
|
|
z[j1].re = temp11;
|
|
|
|
|
z[j1].im = temp12;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
s->fft_calc(s, z);
|
|
|
|
|
|
|
|
|
|
/* post rotation + reordering */
|
|
|
|
|
/* n8 = 32 or 64 */
|
|
|
|
|
for(k = 0; k < n8; k += 2) {
|
|
|
|
|
tcos1 = &tcos[n8 - k - 2];
|
|
|
|
|
tsin1 = &tsin[n8 - k - 2];
|
|
|
|
|
tcos2 = &tcos[n8 + k];
|
|
|
|
|
tsin2 = &tsin[n8 + k];
|
|
|
|
|
z1 = &z[n8 - k - 2];
|
|
|
|
|
z2 = &z[n8 + k ];
|
|
|
|
|
|
|
|
|
|
__asm__ volatile (
|
|
|
|
|
"lwc1 %[temp1], 12(%[z1]) \t\n"
|
|
|
|
|
"lwc1 %[temp2], 4(%[tsin1]) \t\n"
|
|
|
|
|
"lwc1 %[temp3], 4(%[tcos1]) \t\n"
|
|
|
|
|
"lwc1 %[temp4], 8(%[z1]) \t\n"
|
|
|
|
|
"lwc1 %[temp5], 4(%[z1]) \t\n"
|
|
|
|
|
"mul.s %[temp9], %[temp1], %[temp2] \t\n"
|
|
|
|
|
"mul.s %[temp10], %[temp1], %[temp3] \t\n"
|
|
|
|
|
"lwc1 %[temp6], 0(%[tsin1]) \t\n"
|
|
|
|
|
"lwc1 %[temp7], 0(%[tcos1]) \t\n"
|
|
|
|
|
"nmsub.s %[temp9], %[temp9], %[temp4], %[temp3] \t\n"
|
|
|
|
|
"madd.s %[temp10], %[temp10], %[temp4], %[temp2] \t\n"
|
|
|
|
|
"mul.s %[temp11], %[temp5], %[temp6] \t\n"
|
|
|
|
|
"mul.s %[temp12], %[temp5], %[temp7] \t\n"
|
|
|
|
|
"lwc1 %[temp8], 0(%[z1]) \t\n"
|
|
|
|
|
"lwc1 %[temp1], 4(%[z2]) \t\n"
|
|
|
|
|
"lwc1 %[temp2], 0(%[tsin2]) \t\n"
|
|
|
|
|
"lwc1 %[temp3], 0(%[tcos2]) \t\n"
|
|
|
|
|
"nmsub.s %[temp11], %[temp11], %[temp8], %[temp7] \t\n"
|
|
|
|
|
"madd.s %[temp12], %[temp12], %[temp8], %[temp6] \t\n"
|
|
|
|
|
"mul.s %[temp13], %[temp1], %[temp2] \t\n"
|
|
|
|
|
"mul.s %[temp14], %[temp1], %[temp3] \t\n"
|
|
|
|
|
"lwc1 %[temp4], 0(%[z2]) \t\n"
|
|
|
|
|
"lwc1 %[temp5], 12(%[z2]) \t\n"
|
|
|
|
|
"lwc1 %[temp6], 4(%[tsin2]) \t\n"
|
|
|
|
|
"lwc1 %[temp7], 4(%[tcos2]) \t\n"
|
|
|
|
|
"nmsub.s %[temp13], %[temp13], %[temp4], %[temp3] \t\n"
|
|
|
|
|
"madd.s %[temp14], %[temp14], %[temp4], %[temp2] \t\n"
|
|
|
|
|
"mul.s %[temp15], %[temp5], %[temp6] \t\n"
|
|
|
|
|
"mul.s %[temp16], %[temp5], %[temp7] \t\n"
|
|
|
|
|
"lwc1 %[temp8], 8(%[z2]) \t\n"
|
|
|
|
|
"nmsub.s %[temp15], %[temp15], %[temp8], %[temp7] \t\n"
|
|
|
|
|
"madd.s %[temp16], %[temp16], %[temp8], %[temp6] \t\n"
|
|
|
|
|
: [temp1]"=&f"(temp1), [temp2]"=&f"(temp2),
|
|
|
|
|
[temp3]"=&f"(temp3), [temp4]"=&f"(temp4),
|
|
|
|
|
[temp5]"=&f"(temp5), [temp6]"=&f"(temp6),
|
|
|
|
|
[temp7]"=&f"(temp7), [temp8]"=&f"(temp8),
|
|
|
|
|
[temp9]"=&f"(temp9), [temp10]"=&f"(temp10),
|
|
|
|
|
[temp11]"=&f"(temp11), [temp12]"=&f"(temp12),
|
|
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[temp13]"=&f"(temp13), [temp14]"=&f"(temp14),
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[temp15]"=&f"(temp15), [temp16]"=&f"(temp16)
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: [z1]"r"(z1), [z2]"r"(z2),
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[tsin1]"r"(tsin1), [tcos1]"r"(tcos1),
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[tsin2]"r"(tsin2), [tcos2]"r"(tcos2)
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: "memory"
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);
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z1[1].re = temp9;
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z1[1].im = temp14;
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z2[0].re = temp13;
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z2[0].im = temp10;
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z1[0].re = temp11;
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z1[0].im = temp16;
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z2[1].re = temp15;
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z2[1].im = temp12;
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}
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}
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/**
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* Compute inverse MDCT of size N = 2^nbits
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* @param output N samples
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* @param input N/2 samples
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*/
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static void ff_imdct_calc_mips(FFTContext *s, FFTSample *output, const FFTSample *input)
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{
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int k;
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int n = 1 << s->mdct_bits;
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int n2 = n >> 1;
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int n4 = n >> 2;
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ff_imdct_half_mips(s, output+n4, input);
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for(k = 0; k < n4; k+=4) {
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output[k] = -output[n2-k-1];
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output[k+1] = -output[n2-k-2];
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output[k+2] = -output[n2-k-3];
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output[k+3] = -output[n2-k-4];
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output[n-k-1] = output[n2+k];
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output[n-k-2] = output[n2+k+1];
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output[n-k-3] = output[n2+k+2];
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output[n-k-4] = output[n2+k+3];
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}
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}
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#endif /* HAVE_INLINE_ASM */
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av_cold void ff_fft_init_mips(FFTContext *s)
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|
{
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|
int n=0;
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ff_fft_lut_init(ff_fft_offsets_lut, 0, 1 << 16, &n);
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ff_init_ff_cos_tabs(16);
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|
#if HAVE_INLINE_ASM
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|
|
s->fft_calc = ff_fft_calc_mips;
|
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|
|
|
#if CONFIG_MDCT
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|
|
s->imdct_calc = ff_imdct_calc_mips;
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|
|
s->imdct_half = ff_imdct_half_mips;
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|
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#endif
|
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|
#endif
|
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}
|
