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| /* | |
| * Copyright (c) 2012 | |
| * MIPS Technologies, Inc., California. | |
| * | |
| * Redistribution and use in source and binary forms, with or without | |
| * modification, are permitted provided that the following conditions | |
| * are met: | |
| * 1. Redistributions of source code must retain the above copyright | |
| * notice, this list of conditions and the following disclaimer. | |
| * 2. Redistributions in binary form must reproduce the above copyright | |
| * notice, this list of conditions and the following disclaimer in the | |
| * documentation and/or other materials provided with the distribution. | |
| * 3. Neither the name of the MIPS Technologies, Inc., nor the names of its | |
| * contributors may be used to endorse or promote products derived from | |
| * this software without specific prior written permission. | |
| * | |
| * THIS SOFTWARE IS PROVIDED BY THE MIPS TECHNOLOGIES, INC. ``AS IS'' AND | |
| * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
| * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE | |
| * ARE DISCLAIMED. IN NO EVENT SHALL THE MIPS TECHNOLOGIES, INC. BE LIABLE | |
| * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL | |
| * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS | |
| * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | |
| * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT | |
| * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY | |
| * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF | |
| * SUCH DAMAGE. | |
| * | |
| * Author: Stanislav Ocovaj ([email protected]) | |
| * Author: Zoran Lukic ([email protected]) | |
| * | |
| * Optimized MDCT/IMDCT and FFT transforms | |
| * | |
| * This file is part of FFmpeg. | |
| * | |
| * FFmpeg is free software; you can redistribute it and/or | |
| * modify it under the terms of the GNU Lesser General Public | |
| * License as published by the Free Software Foundation; either | |
| * version 2.1 of the License, or (at your option) any later version. | |
| * | |
| * FFmpeg 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 | |
| * Lesser General Public License for more details. | |
| * | |
| * You should have received a copy of the GNU Lesser General Public | |
| * License along with FFmpeg; if not, write to the Free Software | |
| * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA | |
| */ | |
| /** | |
| * FFT transform | |
| */ | |
| static void ff_fft_calc_mips(FFTContext *s, FFTComplex *z) | |
| { | |
| int nbits, i, n, num_transforms, offset, step; | |
| int n4, n2, n34; | |
| FFTSample tmp1, tmp2, tmp3, tmp4, tmp5, tmp6, tmp7, tmp8; | |
| FFTComplex *tmpz; | |
| float w_re, w_im; | |
| float *w_re_ptr, *w_im_ptr; | |
| const int fft_size = (1 << s->nbits); | |
| float pom, pom1, pom2, pom3; | |
| float temp, temp1, temp3, temp4; | |
| FFTComplex * tmpz_n2, * tmpz_n34, * tmpz_n4; | |
| FFTComplex * tmpz_n2_i, * tmpz_n34_i, * tmpz_n4_i, * tmpz_i; | |
| float f1 = 0.7071067812; | |
| num_transforms = (21845 >> (17 - s->nbits)) | 1; | |
| for (n=0; n<num_transforms; n++) { | |
| offset = ff_fft_offsets_lut[n] << 2; | |
| tmpz = z + offset; | |
| tmp1 = tmpz[0].re + tmpz[1].re; | |
| tmp5 = tmpz[2].re + tmpz[3].re; | |
| tmp2 = tmpz[0].im + tmpz[1].im; | |
| tmp6 = tmpz[2].im + tmpz[3].im; | |
| tmp3 = tmpz[0].re - tmpz[1].re; | |
| tmp8 = tmpz[2].im - tmpz[3].im; | |
| tmp4 = tmpz[0].im - tmpz[1].im; | |
| tmp7 = tmpz[2].re - tmpz[3].re; | |
| tmpz[0].re = tmp1 + tmp5; | |
| tmpz[2].re = tmp1 - tmp5; | |
| tmpz[0].im = tmp2 + tmp6; | |
| tmpz[2].im = tmp2 - tmp6; | |
| tmpz[1].re = tmp3 + tmp8; | |
| tmpz[3].re = tmp3 - tmp8; | |
| tmpz[1].im = tmp4 - tmp7; | |
| tmpz[3].im = tmp4 + tmp7; | |
| } | |
| if (fft_size < 8) | |
| return; | |
| num_transforms = (num_transforms >> 1) | 1; | |
| for (n=0; n<num_transforms; n++) { | |
| offset = ff_fft_offsets_lut[n] << 3; | |
| tmpz = z + offset; | |
| __asm__ volatile ( | |
| "lwc1 %[tmp1], 32(%[tmpz]) \n\t" | |
| "lwc1 %[pom], 40(%[tmpz]) \n\t" | |
| "lwc1 %[tmp3], 48(%[tmpz]) \n\t" | |
| "lwc1 %[pom1], 56(%[tmpz]) \n\t" | |
| "lwc1 %[tmp2], 36(%[tmpz]) \n\t" | |
| "lwc1 %[pom2], 44(%[tmpz]) \n\t" | |
| "lwc1 %[pom3], 60(%[tmpz]) \n\t" | |
| "lwc1 %[tmp4], 52(%[tmpz]) \n\t" | |
| "add.s %[tmp1], %[tmp1], %[pom] \n\t" // tmp1 = tmpz[4].re + tmpz[5].re; | |
| "add.s %[tmp3], %[tmp3], %[pom1] \n\t" // tmp3 = tmpz[6].re + tmpz[7].re; | |
| "add.s %[tmp2], %[tmp2], %[pom2] \n\t" // tmp2 = tmpz[4].im + tmpz[5].im; | |
| "lwc1 %[pom], 40(%[tmpz]) \n\t" | |
| "add.s %[tmp4], %[tmp4], %[pom3] \n\t" // tmp4 = tmpz[6].im + tmpz[7].im; | |
| "add.s %[tmp5], %[tmp1], %[tmp3] \n\t" // tmp5 = tmp1 + tmp3; | |
| "sub.s %[tmp7], %[tmp1], %[tmp3] \n\t" // tmp7 = tmp1 - tmp3; | |
| "lwc1 %[tmp1], 32(%[tmpz]) \n\t" | |
| "lwc1 %[pom1], 44(%[tmpz]) \n\t" | |
| "add.s %[tmp6], %[tmp2], %[tmp4] \n\t" // tmp6 = tmp2 + tmp4; | |
| "sub.s %[tmp8], %[tmp2], %[tmp4] \n\t" // tmp8 = tmp2 - tmp4; | |
| "lwc1 %[tmp2], 36(%[tmpz]) \n\t" | |
| "lwc1 %[pom2], 56(%[tmpz]) \n\t" | |
| "lwc1 %[pom3], 60(%[tmpz]) \n\t" | |
| "lwc1 %[tmp3], 48(%[tmpz]) \n\t" | |
| "lwc1 %[tmp4], 52(%[tmpz]) \n\t" | |
| "sub.s %[tmp1], %[tmp1], %[pom] \n\t" // tmp1 = tmpz[4].re - tmpz[5].re; | |
| "lwc1 %[pom], 0(%[tmpz]) \n\t" | |
| "sub.s %[tmp2], %[tmp2], %[pom1] \n\t" // tmp2 = tmpz[4].im - tmpz[5].im; | |
| "sub.s %[tmp3], %[tmp3], %[pom2] \n\t" // tmp3 = tmpz[6].re - tmpz[7].re; | |
| "lwc1 %[pom2], 4(%[tmpz]) \n\t" | |
| "sub.s %[pom1], %[pom], %[tmp5] \n\t" | |
| "sub.s %[tmp4], %[tmp4], %[pom3] \n\t" // tmp4 = tmpz[6].im - tmpz[7].im; | |
| "add.s %[pom3], %[pom], %[tmp5] \n\t" | |
| "sub.s %[pom], %[pom2], %[tmp6] \n\t" | |
| "add.s %[pom2], %[pom2], %[tmp6] \n\t" | |
| "swc1 %[pom1], 32(%[tmpz]) \n\t" // tmpz[4].re = tmpz[0].re - tmp5; | |
| "swc1 %[pom3], 0(%[tmpz]) \n\t" // tmpz[0].re = tmpz[0].re + tmp5; | |
| "swc1 %[pom], 36(%[tmpz]) \n\t" // tmpz[4].im = tmpz[0].im - tmp6; | |
| "swc1 %[pom2], 4(%[tmpz]) \n\t" // tmpz[0].im = tmpz[0].im + tmp6; | |
| "lwc1 %[pom1], 16(%[tmpz]) \n\t" | |
| "lwc1 %[pom3], 20(%[tmpz]) \n\t" | |
| "add.s %[temp1],%[tmp1], %[tmp2] \n\t" | |
| "sub.s %[temp], %[pom1], %[tmp8] \n\t" | |
| "add.s %[pom2], %[pom3], %[tmp7] \n\t" | |
| "sub.s %[temp3],%[tmp3], %[tmp4] \n\t" | |
| "sub.s %[temp4],%[tmp2], %[tmp1] \n\t" | |
| "swc1 %[temp], 48(%[tmpz]) \n\t" // tmpz[6].re = tmpz[2].re - tmp8; | |
| "swc1 %[pom2], 52(%[tmpz]) \n\t" // tmpz[6].im = tmpz[2].im + tmp7; | |
| "add.s %[pom1], %[pom1], %[tmp8] \n\t" | |
| "sub.s %[pom3], %[pom3], %[tmp7] \n\t" | |
| "add.s %[tmp3], %[tmp3], %[tmp4] \n\t" | |
| "mul.s %[tmp5], %[f1], %[temp1] \n\t" // tmp5 = pom * (tmp1 + tmp2); | |
| "mul.s %[tmp7], %[f1], %[temp3] \n\t" // tmp7 = pom * (tmp3 - tmp4); | |
| "mul.s %[tmp6], %[f1], %[temp4] \n\t" // tmp6 = pom * (tmp2 - tmp1); | |
| "mul.s %[tmp8], %[f1], %[tmp3] \n\t" // tmp8 = pom * (tmp3 + tmp4); | |
| "swc1 %[pom1], 16(%[tmpz]) \n\t" // tmpz[2].re = tmpz[2].re + tmp8; | |
| "swc1 %[pom3], 20(%[tmpz]) \n\t" // tmpz[2].im = tmpz[2].im - tmp7; | |
| "add.s %[tmp1], %[tmp5], %[tmp7] \n\t" // tmp1 = tmp5 + tmp7; | |
| "sub.s %[tmp3], %[tmp5], %[tmp7] \n\t" // tmp3 = tmp5 - tmp7; | |
| "add.s %[tmp2], %[tmp6], %[tmp8] \n\t" // tmp2 = tmp6 + tmp8; | |
| "sub.s %[tmp4], %[tmp6], %[tmp8] \n\t" // tmp4 = tmp6 - tmp8; | |
| "lwc1 %[temp], 8(%[tmpz]) \n\t" | |
| "lwc1 %[temp1],12(%[tmpz]) \n\t" | |
| "lwc1 %[pom], 24(%[tmpz]) \n\t" | |
| "lwc1 %[pom2], 28(%[tmpz]) \n\t" | |
| "sub.s %[temp4],%[temp], %[tmp1] \n\t" | |
| "sub.s %[temp3],%[temp1], %[tmp2] \n\t" | |
| "add.s %[temp], %[temp], %[tmp1] \n\t" | |
| "add.s %[temp1],%[temp1], %[tmp2] \n\t" | |
| "sub.s %[pom1], %[pom], %[tmp4] \n\t" | |
| "add.s %[pom3], %[pom2], %[tmp3] \n\t" | |
| "add.s %[pom], %[pom], %[tmp4] \n\t" | |
| "sub.s %[pom2], %[pom2], %[tmp3] \n\t" | |
| "swc1 %[temp4],40(%[tmpz]) \n\t" // tmpz[5].re = tmpz[1].re - tmp1; | |
| "swc1 %[temp3],44(%[tmpz]) \n\t" // tmpz[5].im = tmpz[1].im - tmp2; | |
| "swc1 %[temp], 8(%[tmpz]) \n\t" // tmpz[1].re = tmpz[1].re + tmp1; | |
| "swc1 %[temp1],12(%[tmpz]) \n\t" // tmpz[1].im = tmpz[1].im + tmp2; | |
| "swc1 %[pom1], 56(%[tmpz]) \n\t" // tmpz[7].re = tmpz[3].re - tmp4; | |
| "swc1 %[pom3], 60(%[tmpz]) \n\t" // tmpz[7].im = tmpz[3].im + tmp3; | |
| "swc1 %[pom], 24(%[tmpz]) \n\t" // tmpz[3].re = tmpz[3].re + tmp4; | |
| "swc1 %[pom2], 28(%[tmpz]) \n\t" // tmpz[3].im = tmpz[3].im - tmp3; | |
| : [tmp1]"=&f"(tmp1), [pom]"=&f"(pom), [pom1]"=&f"(pom1), [pom2]"=&f"(pom2), | |
| [tmp3]"=&f"(tmp3), [tmp2]"=&f"(tmp2), [tmp4]"=&f"(tmp4), [tmp5]"=&f"(tmp5), [tmp7]"=&f"(tmp7), | |
| [tmp6]"=&f"(tmp6), [tmp8]"=&f"(tmp8), [pom3]"=&f"(pom3),[temp]"=&f"(temp), [temp1]"=&f"(temp1), | |
| [temp3]"=&f"(temp3), [temp4]"=&f"(temp4) | |
| : [tmpz]"r"(tmpz), [f1]"f"(f1) | |
| : "memory" | |
| ); | |
| } | |
| step = 1 << (MAX_LOG2_NFFT - 4); | |
| n4 = 4; | |
| for (nbits=4; nbits<=s->nbits; nbits++) { | |
| num_transforms = (num_transforms >> 1) | 1; | |
| n2 = 2 * n4; | |
| n34 = 3 * n4; | |
| for (n=0; n<num_transforms; n++) { | |
| offset = ff_fft_offsets_lut[n] << nbits; | |
| tmpz = z + offset; | |
| tmpz_n2 = tmpz + n2; | |
| tmpz_n4 = tmpz + n4; | |
| tmpz_n34 = tmpz + n34; | |
| __asm__ volatile ( | |
| "lwc1 %[pom1], 0(%[tmpz_n2]) \n\t" | |
| "lwc1 %[pom], 0(%[tmpz_n34]) \n\t" | |
| "lwc1 %[pom2], 4(%[tmpz_n2]) \n\t" | |
| "lwc1 %[pom3], 4(%[tmpz_n34]) \n\t" | |
| "lwc1 %[temp1],0(%[tmpz]) \n\t" | |
| "lwc1 %[temp3],4(%[tmpz]) \n\t" | |
| "add.s %[tmp5], %[pom1], %[pom] \n\t" // tmp5 = tmpz[ n2].re + tmpz[n34].re; | |
| "sub.s %[tmp1], %[pom1], %[pom] \n\t" // tmp1 = tmpz[ n2].re - tmpz[n34].re; | |
| "add.s %[tmp6], %[pom2], %[pom3] \n\t" // tmp6 = tmpz[ n2].im + tmpz[n34].im; | |
| "sub.s %[tmp2], %[pom2], %[pom3] \n\t" // tmp2 = tmpz[ n2].im - tmpz[n34].im; | |
| "sub.s %[temp], %[temp1], %[tmp5] \n\t" | |
| "add.s %[temp1],%[temp1], %[tmp5] \n\t" | |
| "sub.s %[temp4],%[temp3], %[tmp6] \n\t" | |
| "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_131072 + step); | |
| w_im_ptr = (float*)(ff_cos_131072 + 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), | |
| [temp13]"=&f"(temp13), [temp14]"=&f"(temp14), | |
| [temp15]"=&f"(temp15), [temp16]"=&f"(temp16) | |
| : [z1]"r"(z1), [z2]"r"(z2), | |
| [tsin1]"r"(tsin1), [tcos1]"r"(tcos1), | |
| [tsin2]"r"(tsin2), [tcos2]"r"(tcos2) | |
| : "memory" | |
| ); | |
| z1[1].re = temp9; | |
| z1[1].im = temp14; | |
| z2[0].re = temp13; | |
| z2[0].im = temp10; | |
| z1[0].re = temp11; | |
| z1[0].im = temp16; | |
| z2[1].re = temp15; | |
| z2[1].im = temp12; | |
| } | |
| } | |
| /** | |
| * Compute inverse MDCT of size N = 2^nbits | |
| * @param output N samples | |
| * @param input N/2 samples | |
| */ | |
| static void ff_imdct_calc_mips(FFTContext *s, FFTSample *output, const FFTSample *input) | |
| { | |
| int k; | |
| int n = 1 << s->mdct_bits; | |
| int n2 = n >> 1; | |
| int n4 = n >> 2; | |
| ff_imdct_half_mips(s, output+n4, input); | |
| for(k = 0; k < n4; k+=4) { | |
| output[k] = -output[n2-k-1]; | |
| output[k+1] = -output[n2-k-2]; | |
| output[k+2] = -output[n2-k-3]; | |
| output[k+3] = -output[n2-k-4]; | |
| output[n-k-1] = output[n2+k]; | |
| output[n-k-2] = output[n2+k+1]; | |
| output[n-k-3] = output[n2+k+2]; | |
| output[n-k-4] = output[n2+k+3]; | |
| } | |
| } | |
| av_cold void ff_fft_init_mips(FFTContext *s) | |
| { | |
| ff_fft_lut_init(); | |
| ff_init_ff_cos_tabs(17); | |
| s->fft_calc = ff_fft_calc_mips; | |
| s->imdct_calc = ff_imdct_calc_mips; | |
| s->imdct_half = ff_imdct_half_mips; | |
| } | |