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NEON optimised yuv to rgb conversion

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- along the lines of the SSE chroma upsampling.
Total speedup is ~30%.

4% speed loss on YuvToRgbXX conversion using tables instead
of 14-bit fixed precision. TODO(later): investigate, and compare
to x86.

see http://code.google.com/p/webp/issues/detail?id=134

Change-Id: Idc2261037cd13b4553ca20ecc4c4007099c37009
This commit is contained in:
Mans Rullgard 2013-01-17 18:06:26 -08:00 committed by Johann
parent 126c035f3f
commit 090b708a00
6 changed files with 290 additions and 0 deletions
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1
Android.mk
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@ -62,6 +62,7 @@ ifeq ($(TARGET_ARCH_ABI),armeabi-v7a)
# instructions to be generated for armv7a code. Instead target the neon code
# specifically.
LOCAL_SRC_FILES += src/dsp/dec_neon.c.neon
LOCAL_SRC_FILES += src/dsp/upsampling_neon.c.neon
LOCAL_SRC_FILES += src/dsp/enc_neon.c.neon
endif
LOCAL_STATIC_LIBRARIES := cpufeatures

1
makefile.unix
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@ -106,6 +106,7 @@ DSP_OBJS = \
src/dsp/enc_sse2.o \
src/dsp/lossless.o \
src/dsp/upsampling.o \
src/dsp/upsampling_neon.o \
src/dsp/upsampling_sse2.o \
src/dsp/yuv.o \

1
src/dsp/Makefile.am
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@ -14,6 +14,7 @@ COMMON_SOURCES += dsp.h
COMMON_SOURCES += lossless.c
COMMON_SOURCES += lossless.h
COMMON_SOURCES += upsampling.c
COMMON_SOURCES += upsampling_neon.c
COMMON_SOURCES += upsampling_sse2.c
COMMON_SOURCES += yuv.c
COMMON_SOURCES += yuv.h

4
src/dsp/dsp.h
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@ -158,6 +158,9 @@ extern WebPUpsampleLinePairFunc WebPUpsamplers[/* MODE_LAST */];
// Initializes SSE2 version of the fancy upsamplers.
void WebPInitUpsamplersSSE2(void);
// NEON version
void WebPInitUpsamplersNEON(void);
#endif // FANCY_UPSAMPLING
// Point-sampling methods.
@ -199,6 +202,7 @@ extern void (*WebPApplyAlphaMultiply4444)(
void WebPInitPremultiply(void);
void WebPInitPremultiplySSE2(void); // should not be called directly.
void WebPInitPremultiplyNEON(void);
//------------------------------------------------------------------------------

10
src/dsp/upsampling.c
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@ -327,6 +327,11 @@ void WebPInitUpsamplers(void) {
if (VP8GetCPUInfo(kSSE2)) {
WebPInitUpsamplersSSE2();
}
#endif
#if defined(WEBP_USE_NEON)
if (VP8GetCPUInfo(kNEON)) {
WebPInitUpsamplersNEON();
}
#endif
}
#endif // FANCY_UPSAMPLING
@ -347,6 +352,11 @@ void WebPInitPremultiply(void) {
if (VP8GetCPUInfo(kSSE2)) {
WebPInitPremultiplySSE2();
}
#endif
#if defined(WEBP_USE_NEON)
if (VP8GetCPUInfo(kNEON)) {
WebPInitPremultiplyNEON();
}
#endif
}
#endif // FANCY_UPSAMPLING

273
src/dsp/upsampling_neon.c Normal file
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@ -0,0 +1,273 @@
// Copyright 2011 Google Inc. All Rights Reserved.
//
// This code is licensed under the same terms as WebM:
// Software License Agreement: http://www.webmproject.org/license/software/
// Additional IP Rights Grant: http://www.webmproject.org/license/additional/
// -----------------------------------------------------------------------------
//
// NEON version of YUV to RGB upsampling functions.
//
// Author: mans@mansr.com (Mans Rullgard)
// Based on SSE code by: somnath@google.com (Somnath Banerjee)
#include "./dsp.h"
#if defined(__cplusplus) || defined(c_plusplus)
extern "C" {
#endif
#if defined(WEBP_USE_NEON)
#include <assert.h>
#include <arm_neon.h>
#include <string.h>
#include "./yuv.h"
#ifdef FANCY_UPSAMPLING
// Loads 9 pixels each from rows r1 and r2 and generates 16 pixels.
#define UPSAMPLE_16PIXELS(r1, r2, out) { \
uint8x8_t a = vld1_u8(r1); \
uint8x8_t b = vld1_u8(r1 + 1); \
uint8x8_t c = vld1_u8(r2); \
uint8x8_t d = vld1_u8(r2 + 1); \
\
uint16x8_t al = vshll_n_u8(a, 1); \
uint16x8_t bl = vshll_n_u8(b, 1); \
uint16x8_t cl = vshll_n_u8(c, 1); \
uint16x8_t dl = vshll_n_u8(d, 1); \
\
uint8x8_t diag1, diag2; \
uint16x8_t sl; \
\
/* a + b + c + d */ \
sl = vaddl_u8(a, b); \
sl = vaddw_u8(sl, c); \
sl = vaddw_u8(sl, d); \
\
al = vaddq_u16(sl, al); /* 3a + b + c + d */ \
bl = vaddq_u16(sl, bl); /* a + 3b + c + d */ \
\
al = vaddq_u16(al, dl); /* 3a + b + c + 3d */ \
bl = vaddq_u16(bl, cl); /* a + 3b + 3c + d */ \
\
diag2 = vshrn_n_u16(al, 3); \
diag1 = vshrn_n_u16(bl, 3); \
\
a = vrhadd_u8(a, diag1); \
b = vrhadd_u8(b, diag2); \
c = vrhadd_u8(c, diag2); \
d = vrhadd_u8(d, diag1); \
\
vst2_u8(out, (uint8x8x2_t){{ a, b }}); \
vst2_u8(out + 32, (uint8x8x2_t){{ c, d }}); \
}
// Turn the macro into a function for reducing code-size when non-critical
static void Upsample16Pixels(const uint8_t *r1, const uint8_t *r2,
uint8_t *out) {
UPSAMPLE_16PIXELS(r1, r2, out);
}
#define UPSAMPLE_LAST_BLOCK(tb, bb, num_pixels, out) { \
uint8_t r1[9], r2[9]; \
memcpy(r1, (tb), (num_pixels)); \
memcpy(r2, (bb), (num_pixels)); \
/* replicate last byte */ \
memset(r1 + (num_pixels), r1[(num_pixels) - 1], 9 - (num_pixels)); \
memset(r2 + (num_pixels), r2[(num_pixels) - 1], 9 - (num_pixels)); \
Upsample16Pixels(r1, r2, out); \
}
#define CY 76283
#define CVR 89858
#define CUG 22014
#define CVG 45773
#define CUB 113618
static const int16_t coef[4] = { CVR / 4, CUG, CVG / 2, CUB / 4 };
#define CONVERT8(FMT, XSTEP, N, src_y, src_uv, out, cur_x) { \
int i; \
for (i = 0; i < N; i += 8) { \
int off = ((cur_x) + i) * XSTEP; \
uint8x8_t y = vld1_u8(src_y + (cur_x) + i); \
uint8x8_t u = vld1_u8((src_uv) + i); \
uint8x8_t v = vld1_u8((src_uv) + i + 16); \
int16x8_t yy = vreinterpretq_s16_u16(vsubl_u8(y, u16)); \
int16x8_t uu = vreinterpretq_s16_u16(vsubl_u8(u, u128)); \
int16x8_t vv = vreinterpretq_s16_u16(vsubl_u8(v, u128)); \
\
int16x8_t ud = vshlq_n_s16(uu, 1); \
int16x8_t vd = vshlq_n_s16(vv, 1); \
\
int32x4_t vrl = vqdmlal_lane_s16(vshll_n_s16(vget_low_s16(vv), 1), \
vget_low_s16(vd), cf16, 0); \
int32x4_t vrh = vqdmlal_lane_s16(vshll_n_s16(vget_high_s16(vv), 1), \
vget_high_s16(vd), cf16, 0); \
int16x8_t vr = vcombine_s16(vrshrn_n_s32(vrl, 16), \
vrshrn_n_s32(vrh, 16)); \
\
int32x4_t vl = vmovl_s16(vget_low_s16(vv)); \
int32x4_t vh = vmovl_s16(vget_high_s16(vv)); \
int32x4_t ugl = vmlal_lane_s16(vl, vget_low_s16(uu), cf16, 1); \
int32x4_t ugh = vmlal_lane_s16(vh, vget_high_s16(uu), cf16, 1); \
int32x4_t gcl = vqdmlal_lane_s16(ugl, vget_low_s16(vv), cf16, 2); \
int32x4_t gch = vqdmlal_lane_s16(ugh, vget_high_s16(vv), cf16, 2); \
int16x8_t gc = vcombine_s16(vrshrn_n_s32(gcl, 16), \
vrshrn_n_s32(gch, 16)); \
\
int32x4_t ubl = vqdmlal_lane_s16(vshll_n_s16(vget_low_s16(uu), 1), \
vget_low_s16(ud), cf16, 3); \
int32x4_t ubh = vqdmlal_lane_s16(vshll_n_s16(vget_high_s16(uu), 1), \
vget_high_s16(ud), cf16, 3); \
int16x8_t ub = vcombine_s16(vrshrn_n_s32(ubl, 16), \
vrshrn_n_s32(ubh, 16)); \
\
int32x4_t rl = vaddl_s16(vget_low_s16(yy), vget_low_s16(vr)); \
int32x4_t rh = vaddl_s16(vget_high_s16(yy), vget_high_s16(vr)); \
int32x4_t gl = vsubl_s16(vget_low_s16(yy), vget_low_s16(gc)); \
int32x4_t gh = vsubl_s16(vget_high_s16(yy), vget_high_s16(gc)); \
int32x4_t bl = vaddl_s16(vget_low_s16(yy), vget_low_s16(ub)); \
int32x4_t bh = vaddl_s16(vget_high_s16(yy), vget_high_s16(ub)); \
\
rl = vmulq_lane_s32(rl, cf32, 0); \
rh = vmulq_lane_s32(rh, cf32, 0); \
gl = vmulq_lane_s32(gl, cf32, 0); \
gh = vmulq_lane_s32(gh, cf32, 0); \
bl = vmulq_lane_s32(bl, cf32, 0); \
bh = vmulq_lane_s32(bh, cf32, 0); \
\
y = vqmovun_s16(vcombine_s16(vrshrn_n_s32(rl, 16), \
vrshrn_n_s32(rh, 16))); \
u = vqmovun_s16(vcombine_s16(vrshrn_n_s32(gl, 16), \
vrshrn_n_s32(gh, 16))); \
v = vqmovun_s16(vcombine_s16(vrshrn_n_s32(bl, 16), \
vrshrn_n_s32(bh, 16))); \
STR_ ## FMT(out + off, y, u, v); \
} \
}
#define v255 vmov_n_u8(255)
#define STR_Rgb(out, r, g, b) vst3_u8(out, (uint8x8x3_t){{ r, g, b }})
#define STR_Bgr(out, r, g, b) vst3_u8(out, (uint8x8x3_t){{ b, g, r }})
#define STR_Rgba(out, r, g, b) vst4_u8(out, (uint8x8x4_t){{ r, g, b, v255 }})
#define STR_Bgra(out, r, g, b) vst4_u8(out, (uint8x8x4_t){{ b, g, r, v255 }})
#define CONVERT1(FMT, XSTEP, N, src_y, src_uv, rgb, cur_x) { \
int i; \
for (i = 0; i < N; i++) { \
int off = ((cur_x) + i) * XSTEP; \
int y = src_y[(cur_x) + i]; \
int u = (src_uv)[i]; \
int v = (src_uv)[i + 16]; \
VP8YuvTo ## FMT(y, u, v, rgb + off); \
} \
}
#define CONVERT2RGB_8(FMT, XSTEP, top_y, bottom_y, uv, \
top_dst, bottom_dst, cur_x, len) { \
if (top_y) { \
CONVERT8(FMT, XSTEP, len, top_y, uv, top_dst, cur_x) \
} \
if (bottom_y) { \
CONVERT8(FMT, XSTEP, len, bottom_y, (uv) + 32, bottom_dst, cur_x) \
} \
}
#define CONVERT2RGB_1(FMT, XSTEP, top_y, bottom_y, uv, \
top_dst, bottom_dst, cur_x, len) { \
if (top_y) { \
CONVERT1(FMT, XSTEP, len, top_y, uv, top_dst, cur_x); \
} \
if (bottom_y) { \
CONVERT1(FMT, XSTEP, len, bottom_y, (uv) + 32, bottom_dst, cur_x); \
} \
}
#define NEON_UPSAMPLE_FUNC(FUNC_NAME, FMT, XSTEP) \
static void FUNC_NAME(const uint8_t *top_y, const uint8_t *bottom_y, \
const uint8_t *top_u, const uint8_t *top_v, \
const uint8_t *cur_u, const uint8_t *cur_v, \
uint8_t *top_dst, uint8_t *bottom_dst, int len) { \
int b; \
/* 16 byte aligned array to cache reconstructed u and v */ \
uint8_t uv_buf[2 * 32 + 15]; \
uint8_t *const r_uv = (uint8_t*)((uintptr_t)(uv_buf + 15) & ~15); \
const int uv_len = (len + 1) >> 1; \
/* 9 pixels must be read-able for each block */ \
const int num_blocks = (uv_len - 1) >> 3; \
const int leftover = uv_len - num_blocks * 8; \
const int last_pos = 1 + 16 * num_blocks; \
\
const int u_diag = ((top_u[0] + cur_u[0]) >> 1) + 1; \
const int v_diag = ((top_v[0] + cur_v[0]) >> 1) + 1; \
\
const int16x4_t cf16 = vld1_s16(coef); \
const int32x2_t cf32 = vmov_n_s32(CY); \
const uint8x8_t u16 = vmov_n_u8(16); \
const uint8x8_t u128 = vmov_n_u8(128); \
\
/* Treat the first pixel in regular way */ \
if (top_y) { \
const int u0 = (top_u[0] + u_diag) >> 1; \
const int v0 = (top_v[0] + v_diag) >> 1; \
VP8YuvTo ## FMT(top_y[0], u0, v0, top_dst); \
} \
if (bottom_y) { \
const int u0 = (cur_u[0] + u_diag) >> 1; \
const int v0 = (cur_v[0] + v_diag) >> 1; \
VP8YuvTo ## FMT(bottom_y[0], u0, v0, bottom_dst); \
} \
\
for (b = 0; b < num_blocks; ++b) { \
UPSAMPLE_16PIXELS(top_u, cur_u, r_uv); \
UPSAMPLE_16PIXELS(top_v, cur_v, r_uv + 16); \
CONVERT2RGB_8(FMT, XSTEP, top_y, bottom_y, r_uv, \
top_dst, bottom_dst, 16 * b + 1, 16); \
top_u += 8; \
cur_u += 8; \
top_v += 8; \
cur_v += 8; \
} \
\
UPSAMPLE_LAST_BLOCK(top_u, cur_u, leftover, r_uv); \
UPSAMPLE_LAST_BLOCK(top_v, cur_v, leftover, r_uv + 16); \
CONVERT2RGB_1(FMT, XSTEP, top_y, bottom_y, r_uv, \
top_dst, bottom_dst, last_pos, len - last_pos); \
}
// NEON variants of the fancy upsampler.
NEON_UPSAMPLE_FUNC(UpsampleRgbLinePairNEON, Rgb, 3)
NEON_UPSAMPLE_FUNC(UpsampleBgrLinePairNEON, Bgr, 3)
NEON_UPSAMPLE_FUNC(UpsampleRgbaLinePairNEON, Rgba, 4)
NEON_UPSAMPLE_FUNC(UpsampleBgraLinePairNEON, Bgra, 4)
#endif // FANCY_UPSAMPLING
#endif // WEBP_USE_NEON
//------------------------------------------------------------------------------
extern WebPUpsampleLinePairFunc WebPUpsamplers[/* MODE_LAST */];
void WebPInitUpsamplersNEON(void) {
#if defined(WEBP_USE_NEON)
WebPUpsamplers[MODE_RGB] = UpsampleRgbLinePairNEON;
WebPUpsamplers[MODE_RGBA] = UpsampleRgbaLinePairNEON;
WebPUpsamplers[MODE_BGR] = UpsampleBgrLinePairNEON;
WebPUpsamplers[MODE_BGRA] = UpsampleBgraLinePairNEON;
#endif // WEBP_USE_NEON
}
void WebPInitPremultiplyNEON(void) {
#if defined(WEBP_USE_NEON)
WebPUpsamplers[MODE_rgbA] = UpsampleRgbaLinePairNEON;
WebPUpsamplers[MODE_bgrA] = UpsampleBgraLinePairNEON;
#endif // WEBP_USE_NEON
}
#if defined(__cplusplus) || defined(c_plusplus)
} // extern "C"
#endif