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ARM: libavresample: NEON optimised flat float to s16 conversion 

Signed-off-by: Mans Rullgard <mans@mansr.com>
This commit is contained in:
Mans Rullgard 2012-09-09 19:25:43 +01:00
parent ca6b544ac9
commit 643b5b794f
5 changed files with 110 additions and 0 deletions
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2
libavresample/arm/Makefile Normal file
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@ -0,0 +1,2 @@
OBJS += arm/audio_convert_init.o
NEON-OBJS += arm/audio_convert_neon.o

39
libavresample/arm/audio_convert_init.c Normal file
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@ -0,0 +1,39 @@
/*
* This file is part of Libav.
*
* Libav 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.
*
* Libav 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 Libav; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include <stdint.h>
#include "config.h"
#include "libavutil/attributes.h"
#include "libavutil/cpu.h"
#include "libavutil/arm/cpu.h"
#include "libavutil/samplefmt.h"
#include "libavresample/audio_convert.h"
void ff_conv_flt_to_s16_neon(int16_t *dst, const float *src, int len);
av_cold void ff_audio_convert_init_arm(AudioConvert *ac)
{
int cpu_flags = av_get_cpu_flags();
if (have_neon(cpu_flags)) {
ff_audio_convert_set_func(ac, AV_SAMPLE_FMT_S16, AV_SAMPLE_FMT_FLT,
0, 16, 8, "NEON",
ff_conv_flt_to_s16_neon);
}
}

66
libavresample/arm/audio_convert_neon.S Normal file
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@ -0,0 +1,66 @@
/*
* Copyright (c) 2008 Mans Rullgard <mans@mansr.com>
*
* This file is part of Libav.
*
* Libav 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.
*
* Libav 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 Libav; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "config.h"
#include "libavutil/arm/asm.S"
function ff_conv_flt_to_s16_neon, export=1
subs r2, r2, #8
vld1.32 {q0}, [r1,:128]!
vcvt.s32.f32 q8, q0, #31
vld1.32 {q1}, [r1,:128]!
vcvt.s32.f32 q9, q1, #31
beq 3f
bics r12, r2, #15
beq 2f
1: subs r12, r12, #16
vqrshrn.s32 d4, q8, #16
vld1.32 {q0}, [r1,:128]!
vcvt.s32.f32 q0, q0, #31
vqrshrn.s32 d5, q9, #16
vld1.32 {q1}, [r1,:128]!
vcvt.s32.f32 q1, q1, #31
vqrshrn.s32 d6, q0, #16
vst1.16 {q2}, [r0,:128]!
vqrshrn.s32 d7, q1, #16
vld1.32 {q8}, [r1,:128]!
vcvt.s32.f32 q8, q8, #31
vld1.32 {q9}, [r1,:128]!
vcvt.s32.f32 q9, q9, #31
vst1.16 {q3}, [r0,:128]!
bne 1b
ands r2, r2, #15
beq 3f
2: vld1.32 {q0}, [r1,:128]!
vqrshrn.s32 d4, q8, #16
vcvt.s32.f32 q0, q0, #31
vld1.32 {q1}, [r1,:128]!
vqrshrn.s32 d5, q9, #16
vcvt.s32.f32 q1, q1, #31
vqrshrn.s32 d6, q0, #16
vst1.16 {q2}, [r0,:128]!
vqrshrn.s32 d7, q1, #16
vst1.16 {q3}, [r0,:128]!
bx lr
3: vqrshrn.s32 d4, q8, #16
vqrshrn.s32 d5, q9, #16
vst1.16 {q2}, [r0,:128]!
bx lr
endfunc

2
libavresample/audio_convert.c
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@ -276,6 +276,8 @@ AudioConvert *ff_audio_convert_alloc(AVAudioResampleContext *avr,
set_generic_function(ac);
if (ARCH_ARM)
ff_audio_convert_init_arm(ac);
if (ARCH_X86)
ff_audio_convert_init_x86(ac);

1
libavresample/audio_convert.h
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@ -82,6 +82,7 @@ int ff_audio_convert(AudioConvert *ac, AudioData *out, AudioData *in, int len);
/* arch-specific initialization functions */
void ff_audio_convert_init_arm(AudioConvert *ac);
void ff_audio_convert_init_x86(AudioConvert *ac);
#endif /* AVRESAMPLE_AUDIO_CONVERT_H */