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ARM: NEON optimised synth_filter_float 

2.7x faster DCA decoding on Cortex-A8

Originally committed as revision 22828 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Måns Rullgård 2010-04-10 16:27:56 +00:00
parent f462ed1f82
commit e73d1a5efc
4 changed files with 133 additions and 0 deletions
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2
libavcodec/arm/Makefile
View File

@ -33,6 +33,8 @@ NEON-OBJS-$(CONFIG_H264DSP) += arm/h264dsp_neon.o \
arm/h264idct_neon.o \
arm/h264pred_neon.o \
NEON-OBJS-$(CONFIG_DCA_DECODER) += arm/synth_filter_neon.o \
NEON-OBJS-$(CONFIG_VP3_DECODER) += arm/vp3dsp_neon.o
OBJS-$(HAVE_NEON) += arm/dsputil_init_neon.o \

15
libavcodec/arm/fft_init_arm.c
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@ -19,6 +19,7 @@
*/
#include "libavcodec/fft.h"
#include "libavcodec/synth_filter.h"
void ff_fft_permute_neon(FFTContext *s, FFTComplex *z);
void ff_fft_calc_neon(FFTContext *s, FFTComplex *z);
@ -29,6 +30,12 @@ void ff_mdct_calc_neon(FFTContext *s, FFTSample *output, const FFTSample *input)
void ff_rdft_calc_neon(struct RDFTContext *s, FFTSample *z);
void ff_synth_filter_float_neon(FFTContext *imdct,
float *synth_buf_ptr, int *synth_buf_offset,
float synth_buf2[32], const float window[512],
float out[32], const float in[32],
float scale, float bias);
av_cold void ff_fft_init_arm(FFTContext *s)
{
if (HAVE_NEON) {
@ -48,3 +55,11 @@ av_cold void ff_rdft_init_arm(RDFTContext *s)
s->rdft_calc = ff_rdft_calc_neon;
}
#endif
#if CONFIG_DCA_DECODER
av_cold void ff_synth_filter_init_arm(SynthFilterContext *s)
{
if (HAVE_NEON)
s->synth_filter_float = ff_synth_filter_float_neon;
}
#endif

115
libavcodec/arm/synth_filter_neon.S Normal file
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@ -0,0 +1,115 @@
/*
* Copyright (c) 2010 Mans Rullgard <mans@mansr.com>
*
* 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 "asm.S"
preserve8
function ff_synth_filter_float_neon, export=1
push {r3-r11,lr}
ldr r4, [r2] @ synth_buf_offset
add r1, r1, r4, lsl #2 @ synth_buf
sub r12, r4, #32
bfc r12, #9, #23
bic r4, r4, #63
str r12, [r2]
ldr r2, [sp, #12*4] @ in
mov r9, r1 @ synth_buf
bl ff_imdct_half_neon
pop {r3}
ldr r5, [sp, #9*4] @ window
ldr r2, [sp, #10*4] @ out
vldr d0, [sp, #12*4] @ scale, bias
add r8, r9, #12*4
mov lr, #64*4
mov r1, #4
1:
add r10, r9, #16*4 @ synth_buf
add r11, r8, #16*4
add r0, r5, #16*4 @ window
add r6, r5, #32*4
add r7, r5, #48*4
vld1.32 {q10}, [r3,:128] @ a
add r3, r3, #16*4
vld1.32 {q1}, [r3,:128] @ b
vmov.f32 q2, #0.0 @ c
vmov.f32 q3, #0.0 @ d
mov r12, #512
2:
vld1.32 {q9}, [r8, :128], lr
vrev64.32 q9, q9
vld1.32 {q8}, [r5, :128], lr
vmls.f32 d20, d16, d19
vld1.32 {q11}, [r0, :128], lr
vmls.f32 d21, d17, d18
vld1.32 {q12}, [r9, :128], lr
vmla.f32 d2, d22, d24
vld1.32 {q8}, [r6, :128], lr
vmla.f32 d3, d23, d25
vld1.32 {q9}, [r10,:128], lr
vmla.f32 d4, d16, d18
vld1.32 {q12}, [r11,:128], lr
vmla.f32 d5, d17, d19
vrev64.32 q12, q12
vld1.32 {q11}, [r7, :128], lr
vmla.f32 d6, d22, d25
vmla.f32 d7, d23, d24
subs r12, r12, #64
beq 3f
cmp r12, r4
bne 2b
sub r8, r8, #512*4
sub r9, r9, #512*4
sub r10, r10, #512*4
sub r11, r11, #512*4
b 2b
3:
vdup.32 q8, d0[1]
vdup.32 q9, d0[1]
vmla.f32 q8, q10, d0[0]
vmla.f32 q9, q1, d0[0]
vst1.32 {q3}, [r3,:128]
sub r3, r3, #16*4
vst1.32 {q2}, [r3,:128]
vst1.32 {q8}, [r2,:128]
add r2, r2, #16*4
vst1.32 {q9}, [r2,:128]
subs r1, r1, #1
popeq {r4-r11,pc}
cmp r4, #0
subeq r8, r8, #512*4
subeq r9, r9, #512*4
sub r5, r5, #512*4
sub r2, r2, #12*4 @ out
add r3, r3, #4*4 @ synth_buf2
add r5, r5, #4*4 @ window
add r9, r9, #4*4 @ synth_buf
sub r8, r8, #4*4 @ synth_buf
b 1b
endfunc

1
libavcodec/synth_filter.h
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@ -32,5 +32,6 @@ typedef struct SynthFilterContext {
} SynthFilterContext;
void ff_synth_filter_init(SynthFilterContext *c);
void ff_synth_filter_init_arm(SynthFilterContext *c);
#endif /* AVCODEC_SYNTH_FILTER_H */