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https://git.ffmpeg.org/ffmpeg.git
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4d2f62150d
153372 UNITS in postfilter_c, 65536 runs, 0 skips
73164 UNITS in postfilter_neon, 65536 runs, 0 skips -> 2.1x speedup
80591 UNITS in deemphasis_c, 131072 runs, 0 skips
43969 UNITS in deemphasis_neon, 131072 runs, 0 skips -> 1.83x speedup
Total decoder speedup: ~15% on a Raspberry Pi 3 (from 28.1x to 33.5x realtime)
Deemphasis SIMD based on the following unrolling:
const float c1 = CELT_EMPH_COEFF, c2 = c1*c1, c3 = c2*c1, c4 = c3*c1;
float state = coeff;
for (int i = 0; i < len; i += 4) {
y[0] = x[0] + c1*state;
y[1] = x[1] + c2*state + c1*x[0];
y[2] = x[2] + c3*state + c1*x[1] + c2*x[0];
y[3] = x[3] + c4*state + c1*x[2] + c2*x[1] + c3*x[0];
state = y[3];
y += 4;
x += 4;
}
Unlike the x86 version, duplication is used instead of pslldq so
the structure and tables are different.
68 lines
1.8 KiB
C
68 lines
1.8 KiB
C
/*
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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 "opusdsp.h"
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static void postfilter_c(float *data, int period, float *gains, int len)
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{
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const float g0 = gains[0];
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const float g1 = gains[1];
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const float g2 = gains[2];
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float x4 = data[-period - 2];
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float x3 = data[-period - 1];
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float x2 = data[-period + 0];
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float x1 = data[-period + 1];
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for (int i = 0; i < len; i++) {
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float x0 = data[i - period + 2];
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data[i] += g0 * x2 +
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g1 * (x1 + x3) +
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g2 * (x0 + x4);
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x4 = x3;
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x3 = x2;
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x2 = x1;
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x1 = x0;
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}
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}
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static float deemphasis_c(float *y, float *x, float coeff, int len)
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{
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float state = coeff;
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for (int i = 0; i < len; i++) {
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const float tmp = x[i] + state;
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state = tmp * CELT_EMPH_COEFF;
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y[i] = tmp;
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}
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return state;
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}
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av_cold void ff_opus_dsp_init(OpusDSP *ctx)
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{
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ctx->postfilter = postfilter_c;
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ctx->deemphasis = deemphasis_c;
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if (ARCH_X86)
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ff_opus_dsp_init_x86(ctx);
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if (ARCH_AARCH64)
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ff_opus_dsp_init_aarch64(ctx);
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}
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