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aarch64/opusdsp: implement NEON accelerated postfilter and deemphasis 

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.
This commit is contained in:
Lynne 2019-03-15 14:37:31 +00:00 committed by Carl Eugen Hoyos
parent 1c50d61a5a
commit 4d2f62150d
5 changed files with 154 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
libavcodec/aarch64/Makefile
View File

@ -15,6 +15,7 @@ OBJS-$(CONFIG_VP8DSP) += aarch64/vp8dsp_init_aarch64.o
OBJS-$(CONFIG_AAC_DECODER) += aarch64/aacpsdsp_init_aarch64.o \
aarch64/sbrdsp_init_aarch64.o
OBJS-$(CONFIG_DCA_DECODER) += aarch64/synth_filter_init.o
OBJS-$(CONFIG_OPUS_DECODER) += aarch64/opusdsp_init.o
OBJS-$(CONFIG_RV40_DECODER) += aarch64/rv40dsp_init_aarch64.o
OBJS-$(CONFIG_VC1DSP) += aarch64/vc1dsp_init_aarch64.o
OBJS-$(CONFIG_VORBIS_DECODER) += aarch64/vorbisdsp_init.o
@ -49,6 +50,7 @@ NEON-OBJS-$(CONFIG_VP8DSP) += aarch64/vp8dsp_neon.o
# decoders/encoders
NEON-OBJS-$(CONFIG_AAC_DECODER) += aarch64/aacpsdsp_neon.o
NEON-OBJS-$(CONFIG_DCA_DECODER) += aarch64/synth_filter_neon.o
NEON-OBJS-$(CONFIG_OPUS_DECODER) += aarch64/opusdsp_neon.o
NEON-OBJS-$(CONFIG_VORBIS_DECODER) += aarch64/vorbisdsp_neon.o
NEON-OBJS-$(CONFIG_VP9_DECODER) += aarch64/vp9itxfm_16bpp_neon.o \
aarch64/vp9itxfm_neon.o \

35
libavcodec/aarch64/opusdsp_init.c Normal file
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@ -0,0 +1,35 @@
/*
* 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
*/
#include "config.h"
#include "libavutil/aarch64/cpu.h"
#include "libavcodec/opusdsp.h"
void ff_opus_postfilter_neon(float *data, int period, float *gains, int len);
float ff_opus_deemphasis_neon(float *out, float *in, float coeff, int len);
av_cold void ff_opus_dsp_init_aarch64(OpusDSP *ctx)
{
int cpu_flags = av_get_cpu_flags();
if (have_neon(cpu_flags)) {
ctx->postfilter = ff_opus_postfilter_neon;
ctx->deemphasis = ff_opus_deemphasis_neon;
}
}

113
libavcodec/aarch64/opusdsp_neon.S Normal file
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@ -0,0 +1,113 @@
/*
* 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
*/
#include "libavutil/aarch64/asm.S"
// 0.85..^1 0.85..^2 0.85..^3 0.85..^4
const tab_st, align=4
.word 0x3f599a00, 0x3f38f671, 0x3f1d382a, 0x3f05a32f
endconst
const tab_x0, align=4
.word 0x0, 0x3f599a00, 0x3f38f671, 0x3f1d382a
endconst
const tab_x1, align=4
.word 0x0, 0x0, 0x3f599a00, 0x3f38f671
endconst
const tab_x2, align=4
.word 0x0, 0x0, 0x0, 0x3f599a00
endconst
function ff_opus_deemphasis_neon, export=1
movrel x4, tab_st
ld1 {v4.4s}, [x4]
movrel x4, tab_x0
ld1 {v5.4s}, [x4]
movrel x4, tab_x1
ld1 {v6.4s}, [x4]
movrel x4, tab_x2
ld1 {v7.4s}, [x4]
fmul v0.4s, v4.4s, v0.s[0]
1: ld1 {v1.4s, v2.4s}, [x1], #32
fmla v0.4s, v5.4s, v1.s[0]
fmul v3.4s, v7.4s, v2.s[2]
fmla v0.4s, v6.4s, v1.s[1]
fmla v3.4s, v6.4s, v2.s[1]
fmla v0.4s, v7.4s, v1.s[2]
fmla v3.4s, v5.4s, v2.s[0]
fadd v1.4s, v1.4s, v0.4s
fadd v2.4s, v2.4s, v3.4s
fmla v2.4s, v4.4s, v1.s[3]
st1 {v1.4s, v2.4s}, [x0], #32
fmul v0.4s, v4.4s, v2.s[3]
subs w2, w2, #8
b.gt 1b
mov s0, v2.s[3]
ret
endfunc
function ff_opus_postfilter_neon, export=1
ld1 {v0.4s}, [x2]
dup v1.4s, v0.s[1]
dup v2.4s, v0.s[2]
dup v0.4s, v0.s[0]
add w1, w1, #2
sub x1, x0, x1, lsl #2
ld1 {v3.4s}, [x1]
fmul v3.4s, v3.4s, v2.4s
1: add x1, x1, #4
ld1 {v4.4s}, [x1]
add x1, x1, #4
ld1 {v5.4s}, [x1]
add x1, x1, #4
ld1 {v6.4s}, [x1]
add x1, x1, #4
ld1 {v7.4s}, [x1]
fmla v3.4s, v7.4s, v2.4s
fadd v6.4s, v6.4s, v4.4s
ld1 {v8.4s}, [x0]
fmla v8.4s, v5.4s, v0.4s
fmul v6.4s, v6.4s, v1.4s
fadd v6.4s, v6.4s, v3.4s
fadd v8.4s, v8.4s, v6.4s
fmul v3.4s, v7.4s, v2.4s
st1 {v8.4s}, [x0], #16
subs w3, w3, #4
b.gt 1b
ret
endfunc

3
libavcodec/opusdsp.c
View File

@ -61,4 +61,7 @@ av_cold void ff_opus_dsp_init(OpusDSP *ctx)
if (ARCH_X86)
ff_opus_dsp_init_x86(ctx);
if (ARCH_AARCH64)
ff_opus_dsp_init_aarch64(ctx);
}

1
libavcodec/opusdsp.h
View File

@ -31,5 +31,6 @@ typedef struct OpusDSP {
void ff_opus_dsp_init(OpusDSP *ctx);
void ff_opus_dsp_init_x86(OpusDSP *ctx);
void ff_opus_dsp_init_aarch64(OpusDSP *ctx);
#endif /* AVCODEC_OPUSDSP_H */