From: Matthieu Bouron <matthieu.bou...@stupeflix.com>
---
Hello,
Here are some benchmark on a rpi2 of the attached patch.
./ffmpeg -f lavfi -i
sine=440,aformat=sample_fmts=fltp,asetnsamples=4096,abench=start,aresample=48000,abench=stop
-t 1000 -f null -
With patch: avg=0.001159 speed=44,1x
Without patch: avg=0.001297 speed=40,8x
./ffmpeg -f lavfi -i
sine=440,aformat=sample_fmts=s16p,asetnsamples=4096,abench=start,aresample=48000,abench=stop
-t 1000 -f null -
With patch: avg=0.001374 speed=45,6x
Without patch: avg=0.000782 speed=64,6x
Matthieu
---
libswresample/arm/Makefile | 7 ++-
libswresample/arm/resample.S | 77 ++++++++++++++++++++++++
libswresample/arm/resample_init.c | 120 ++++++++++++++++++++++++++++++++++++++
libswresample/resample.h | 1 +
libswresample/resample_dsp.c | 1 +
5 files changed, 204 insertions(+), 2 deletions(-)
create mode 100644 libswresample/arm/resample.S
create mode 100644 libswresample/arm/resample_init.c
diff --git a/libswresample/arm/Makefile b/libswresample/arm/Makefile
index 60f3f6d..53ab462 100644
--- a/libswresample/arm/Makefile
+++ b/libswresample/arm/Makefile
@@ -1,5 +1,8 @@
-OBJS += arm/audio_convert_init.o
+OBJS += arm/audio_convert_init.o \
+ arm/resample_init.o
+
OBJS-$(CONFIG_NEON_CLOBBER_TEST) += arm/neontest.o
-NEON-OBJS += arm/audio_convert_neon.o
+NEON-OBJS += arm/audio_convert_neon.o \
+ arm/resample.o
diff --git a/libswresample/arm/resample.S b/libswresample/arm/resample.S
new file mode 100644
index 0000000..13462e3
--- /dev/null
+++ b/libswresample/arm/resample.S
@@ -0,0 +1,77 @@
+/*
+ * Copyright (c) 2016 Matthieu Bouron <matthieu.bouron stupeflix.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 "libavutil/arm/asm.S"
+
+function ff_resample_common_apply_filter_x4_float_neon, export=1
+ vmov.f32 q0, #0.0 @
accumulator
+1: vld1.32 {q1}, [r1]! @ src
+ vld1.32 {q2}, [r2]! @ filter
+ vmla.f32 q0, q1, q2 @ src +
{0..3} * filter + {0..3}
+ subs r3, #4 @
filter_length -= 4
+ bgt 1b @ loop
until filter_length
+ vpadd.f32 d0, d0, d1 @ pair
adding of the 4x32-bit accumulated values
+ vpadd.f32 d0, d0, d0 @ pair
adding of the 4x32-bit accumulator values
+ vst1.32 {d0[0]}, [r0] @ write
accumulator
+ mov pc, lr
+endfunc
+
+function ff_resample_common_apply_filter_x8_float_neon, export=1
+ vmov.f32 q0, #0.0 @
accumulator
+1: vld1.32 {q1}, [r1]! @ src1
+ vld1.32 {q2}, [r2]! @
filter1
+ vld1.32 {q8}, [r1]! @ src2
+ vld1.32 {q9}, [r2]! @
filter2
+ vmla.f32 q0, q1, q2 @ src1
+ {0..3} * filter1 + {0..3}
+ vmla.f32 q0, q8, q9 @ src2
+ {0..3} * filter2 + {0..3}
+ subs r3, #8 @
filter_length -= 4
+ bgt 1b @ loop
until filter_length
+ vpadd.f32 d0, d0, d1 @ pair
adding of the 4x32-bit accumulated values
+ vpadd.f32 d0, d0, d0 @ pair
adding of the 4x32-bit accumulator values
+ vst1.32 {d0[0]}, [r0] @ write
accumulator
+ mov pc, lr
+endfunc
+
+function ff_resample_common_apply_filter_x4_s16_neon, export=1
+ vmov.s32 q0, #0 @
accumulator
+1: vld1.16 {d2}, [r1]! @ src
+ vld1.16 {d4}, [r2]! @ filter
+ vmlal.s16 q0, d2, d4 @ src +
{0..3} * filter + {0..3}
+ subs r3, #4 @
filter_length -= 4
+ bgt 1b @ loop
until filter_length
+ vpadd.s32 d0, d0, d1 @ pair
adding of the 4x32-bit accumulated values
+ vpadd.s32 d0, d0, d0 @ pair
adding of the 4x32-bit accumulator values
+ vst1.32 {d0[0]}, [r0] @ write
accumulator
+ mov pc, lr
+endfunc
+
+function ff_resample_common_apply_filter_x8_s16_neon, export=1
+ vmov.s32 q0, #0 @
accumulator
+1: vld1.16 {q1}, [r1]! @ src
+ vld1.16 {q2}, [r2]! @ filter
+ vmlal.s16 q0, d2, d4 @ src +
{0..3} * filter + {0..3}
+ vmlal.s16 q0, d3, d5 @ src +
{4..7} * filter + {4..7}
+ subs r3, #8 @
filter_length -= 8
+ bgt 1b @ loop
until filter_length
+ vpadd.s32 d0, d0, d1 @ pair
adding of the 4x32-bit accumulated values
+ vpadd.s32 d0, d0, d0 @ pair
adding of the 4x32-bit accumulator values
+ vst1.32 {d0[0]}, [r0] @ write
accumulator
+ mov pc, lr
+endfunc
diff --git a/libswresample/arm/resample_init.c
b/libswresample/arm/resample_init.c
new file mode 100644
index 0000000..c817d03
--- /dev/null
+++ b/libswresample/arm/resample_init.c
@@ -0,0 +1,120 @@
+/*
+ * audio resampling
+ * Copyright (c) 2004-2012 Michael Niedermayer <michae...@gmx.at>
+ *
+ * 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
+ * audio resampling
+ * @author Matthieu Bouron <matthieu.bouron stupeflix.com>
+ */
+
+#include "config.h"
+
+#include "libavutil/cpu.h"
+#include "libavutil/avassert.h"
+
+#include "libavutil/arm/cpu.h"
+#include "libswresample/resample.h"
+
+#define DECLARE_RESAMPLE_COMMON_TEMPLATE(TYPE, DELEM, FELEM, FELEM2, OUT)
\
+
\
+void ff_resample_common_apply_filter_x4_##TYPE##_neon(FELEM2 *acc, const DELEM
*src, \
+ const FELEM *filter, int
length); \
+
\
+void ff_resample_common_apply_filter_x8_##TYPE##_neon(FELEM2 *acc, const DELEM
*src, \
+ const FELEM *filter, int
length); \
+
\
+static int ff_resample_common_##TYPE##_neon(ResampleContext *c, void *dest,
const void *source, \
+ int n, int update_ctx)
\
+{
\
+ DELEM *dst = dest;
\
+ const DELEM *src = source;
\
+ int dst_index;
\
+ int index= c->index;
\
+ int frac= c->frac;
\
+ int sample_index = index >> c->phase_shift;
\
+ int x4_aligned_filter_length = c->filter_length & ~3;
\
+ int x8_aligned_filter_length = c->filter_length & ~7;
\
+
\
+ index &= c->phase_mask;
\
+ for (dst_index = 0; dst_index < n; dst_index++) {
\
+ FELEM *filter = ((FELEM *) c->filter_bank) + c->filter_alloc * index;
\
+
\
+ FELEM2 val=0;
\
+ int i = 0;
\
+ if (x8_aligned_filter_length >= 8) {
\
+ ff_resample_common_apply_filter_x8_##TYPE##_neon(&val,
&src[sample_index], \
+ filter,
x8_aligned_filter_length); \
+ i += x8_aligned_filter_length;
\
+
\
+ } else if (x4_aligned_filter_length >= 4) {
\
+ ff_resample_common_apply_filter_x4_##TYPE##_neon(&val,
&src[sample_index], \
+ filter,
x4_aligned_filter_length); \
+ i += x4_aligned_filter_length;
\
+ }
\
+ for (; i < c->filter_length; i++) {
\
+ val += src[sample_index + i] * (FELEM2)filter[i];
\
+ }
\
+ OUT(dst[dst_index], val);
\
+
\
+ frac += c->dst_incr_mod;
\
+ index += c->dst_incr_div;
\
+ if (frac >= c->src_incr) {
\
+ frac -= c->src_incr;
\
+ index++;
\
+ }
\
+ sample_index += index >> c->phase_shift;
\
+ index &= c->phase_mask;
\
+ }
\
+
\
+ if(update_ctx){
\
+ c->frac= frac;
\
+ c->index= index;
\
+ }
\
+
\
+ return sample_index;
\
+}
\
+
+#define OUT(d, v) d = v
+DECLARE_RESAMPLE_COMMON_TEMPLATE(float, float, float, float, OUT)
+#undef OUT
+
+#define OUT(d, v) (v) = ((v) + (1<<(14)))>>15; (d) = av_clip_int16(v)
+DECLARE_RESAMPLE_COMMON_TEMPLATE(s16, int16_t, int16_t, int32_t, OUT)
+#undef OUT
+
+av_cold void swri_resample_dsp_arm_init(ResampleContext *c)
+{
+ int cpu_flags = av_get_cpu_flags();
+
+ if (!have_neon(cpu_flags))
+ return;
+
+ switch(c->format) {
+ case AV_SAMPLE_FMT_FLTP:
+ if (!c->linear)
+ c->dsp.resample = ff_resample_common_float_neon;
+ break;
+ case AV_SAMPLE_FMT_S16P:
+ if (!c->linear)
+ c->dsp.resample = ff_resample_common_s16_neon;
+ break;
+ }
+}
diff --git a/libswresample/resample.h b/libswresample/resample.h
index a126b11..ca0cf2b 100644
--- a/libswresample/resample.h
+++ b/libswresample/resample.h
@@ -60,5 +60,6 @@ typedef struct ResampleContext {
void swri_resample_dsp_init(ResampleContext *c);
void swri_resample_dsp_x86_init(ResampleContext *c);
+void swri_resample_dsp_arm_init(ResampleContext *c);
#endif /* SWRESAMPLE_RESAMPLE_H */
diff --git a/libswresample/resample_dsp.c b/libswresample/resample_dsp.c
index a811b8b..41369f3 100644
--- a/libswresample/resample_dsp.c
+++ b/libswresample/resample_dsp.c
@@ -65,4 +65,5 @@ void swri_resample_dsp_init(ResampleContext *c)
}
if (ARCH_X86) swri_resample_dsp_x86_init(c);
+ else if (ARCH_ARM) swri_resample_dsp_arm_init(c);
}
--
2.8.2
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