/* * 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: Bojan Zivkovic (bojan@mips.com) * * IIR filter optimized for MIPS floating-point architecture * * 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 */ /** * @file * Reference: libavcodec/iirfilter.c */ #include "config.h" #include "libavcodec/iirfilter.h" #if HAVE_INLINE_ASM #if !HAVE_MIPS32R6 && !HAVE_MIPS64R6 typedef struct FFIIRFilterCoeffs { int order; float gain; int *cx; float *cy; } FFIIRFilterCoeffs; typedef struct FFIIRFilterState { float x[1]; } FFIIRFilterState; static void iir_filter_flt_mips(const struct FFIIRFilterCoeffs *c, struct FFIIRFilterState *s, int size, const float *src, ptrdiff_t sstep, float *dst, ptrdiff_t dstep) { if (c->order == 2) { int i; const float *src0 = src; float *dst0 = dst; for (i = 0; i < size; i++) { float in = *src0 * c->gain + s->x[0] * c->cy[0] + s->x[1] * c->cy[1]; *dst0 = s->x[0] + in + s->x[1] * c->cx[1]; s->x[0] = s->x[1]; s->x[1] = in; src0 += sstep; dst0 += dstep; } } else if (c->order == 4) { int i; const float *src0 = src; float *dst0 = dst; float four = 4.0; float six = 6.0; for (i = 0; i < size; i += 4) { float in1, in2, in3, in4; float res1, res2, res3, res4; float *x = s->x; float *cy = c->cy; float gain = c->gain; float src0_0 = src0[0 ]; float src0_1 = src0[sstep ]; float src0_2 = src0[2*sstep]; float src0_3 = src0[3*sstep]; __asm__ volatile ( "lwc1 $f0, 0(%[cy]) \n\t" "lwc1 $f4, 0(%[x]) \n\t" "lwc1 $f5, 4(%[x]) \n\t" "lwc1 $f6, 8(%[x]) \n\t" "lwc1 $f7, 12(%[x]) \n\t" "mul.s %[in1], %[src0_0], %[gain] \n\t" "mul.s %[in2], %[src0_1], %[gain] \n\t" "mul.s %[in3], %[src0_2], %[gain] \n\t" "mul.s %[in4], %[src0_3], %[gain] \n\t" "lwc1 $f1, 4(%[cy]) \n\t" "madd.s %[in1], %[in1], $f0, $f4 \n\t" "madd.s %[in2], %[in2], $f0, $f5 \n\t" "madd.s %[in3], %[in3], $f0, $f6 \n\t" "madd.s %[in4], %[in4], $f0, $f7 \n\t" "lwc1 $f2, 8(%[cy]) \n\t" "madd.s %[in1], %[in1], $f1, $f5 \n\t" "madd.s %[in2], %[in2], $f1, $f6 \n\t" "madd.s %[in3], %[in3], $f1, $f7 \n\t" "lwc1 $f3, 12(%[cy]) \n\t" "add.s $f8, $f5, $f7 \n\t" "madd.s %[in1], %[in1], $f2, $f6 \n\t" "madd.s %[in2], %[in2], $f2, $f7 \n\t" "mul.s $f9, $f6, %[six] \n\t" "mul.s $f10, $f7, %[six] \n\t" "madd.s %[in1], %[in1], $f3, $f7 \n\t" "madd.s %[in2], %[in2], $f3, %[in1] \n\t" "madd.s %[in3], %[in3], $f2, %[in1] \n\t" "madd.s %[in4], %[in4], $f1, %[in1] \n\t" "add.s %[res1], $f4, %[in1] \n\t" "swc1 %[in1], 0(%[x]) \n\t" "add.s $f0, $f6, %[in1] \n\t" "madd.s %[in3], %[in3], $f3, %[in2] \n\t" "madd.s %[in4], %[in4], $f2, %[in2] \n\t" "add.s %[res2], $f5, %[in2] \n\t" "madd.s %[res1], %[res1], $f8, %[four] \n\t" "add.s $f8, $f7, %[in2] \n\t" "swc1 %[in2], 4(%[x]) \n\t" "madd.s %[in4], %[in4], $f3, %[in3] \n\t" "add.s %[res3], $f6, %[in3] \n\t" "add.s %[res1], %[res1], $f9 \n\t" "madd.s %[res2], %[res2], $f0, %[four] \n\t" "swc1 %[in3], 8(%[x]) \n\t" "add.s %[res4], $f7, %[in4] \n\t" "madd.s %[res3], %[res3], $f8, %[four] \n\t" "swc1 %[in4], 12(%[x]) \n\t" "add.s %[res2], %[res2], $f10 \n\t" "add.s $f8, %[in1], %[in3] \n\t" "madd.s %[res3], %[res3], %[in1], %[six] \n\t" "madd.s %[res4], %[res4], $f8, %[four] \n\t" "madd.s %[res4], %[res4], %[in2], %[six] \n\t" : [in1]"=&f"(in1), [in2]"=&f"(in2), [in3]"=&f"(in3), [in4]"=&f"(in4), [res1]"=&f"(res1), [res2]"=&f"(res2), [res3]"=&f"(res3), [res4]"=&f"(res4) : [src0_0]"f"(src0_0), [src0_1]"f"(src0_1), [src0_2]"f"(src0_2), [src0_3]"f"(src0_3), [gain]"f"(gain), [x]"r"(x), [cy]"r"(cy), [four]"f"(four), [six]"f"(six) : "$f0", "$f1", "$f2", "$f3", "$f4", "$f5", "$f6", "$f7", "$f8", "$f9", "$f10", "memory" ); dst0[0 ] = res1; dst0[sstep ] = res2; dst0[2*sstep] = res3; dst0[3*sstep] = res4; src0 += 4*sstep; dst0 += 4*dstep; } } else { int i; const float *src0 = src; float *dst0 = dst; for (i = 0; i < size; i++) { int j; float in, res; in = *src0 * c->gain; for(j = 0; j < c->order; j++) in += c->cy[j] * s->x[j]; res = s->x[0] + in + s->x[c->order >> 1] * c->cx[c->order >> 1]; for(j = 1; j < c->order >> 1; j++) res += (s->x[j] + s->x[c->order - j]) * c->cx[j]; for(j = 0; j < c->order - 1; j++) s->x[j] = s->x[j + 1]; *dst0 = res; s->x[c->order - 1] = in; src0 += sstep; dst0 += dstep; } } } #endif /* !HAVE_MIPS32R6 && !HAVE_MIPS64R6 */ #endif /* HAVE_INLINE_ASM */ void ff_iir_filter_init_mips(FFIIRFilterContext *f) { #if HAVE_INLINE_ASM #if !HAVE_MIPS32R6 && !HAVE_MIPS64R6 f->filter_flt = iir_filter_flt_mips; #endif /* !HAVE_MIPS32R6 && !HAVE_MIPS64R6 */ #endif /* HAVE_INLINE_ASM */ }