swscale/arm: add ff_hscale_8_to_15_neon

libswscale/arm/Makefile

-OBJS        += arm/swscale_unscaled.o
+OBJS        += arm/swscale.o                    \
+               arm/swscale_unscaled.o           \
 
 NEON-OBJS   += arm/rgb2yuv_neon_32.o
 NEON-OBJS   += arm/rgb2yuv_neon_16.o
-NEON-OBJS   += arm/yuv2rgb_neon.o
+NEON-OBJS   += arm/hscale.o                     \
+               arm/yuv2rgb_neon.o               \

libswscale/arm/hscale.S

+/*
+ * Copyright (c) 2016 Clément Bœsch <clement stupeflix.com>
+ * 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_hscale_8_to_15_neon, export=1
+    push                {r4-r12, lr}
+    vpush               {q4-q7}
+    ldr                 r4, [sp, #104]                                 @ filter
+    ldr                 r5, [sp, #108]                                 @ filterPos
+    ldr                 r6, [sp, #112]                                 @ filterSize
+    add                 r10, r4, r6, lsl #1                            @ filter2 = filter + filterSize * 2
+1:  ldr                 r8, [r5], #4                                   @ filterPos[0]
+    ldr                 r9, [r5], #4                                   @ filterPos[1]
+    vmov.s32            q4, #0                                         @ val accumulator
+    vmov.s32            q5, #0                                         @ val accumulator
+    mov                 r7, r6                                         @ tmpfilterSize = filterSize
+    mov                 r0, r3                                         @ srcp
+2:  add                 r11, r0, r8                                    @ srcp + filterPos[0]
+    add                 r12, r0, r9                                    @ srcp + filterPos[1]
+    vld1.8              d0, [r11]                                      @ srcp[filterPos[0] + {0..7}]
+    vld1.8              d2, [r12]                                      @ srcp[filterPos[1] + {0..7}]
+    vld1.16             {q2}, [r4]!                                    @ load 8x16-bit filter values
+    vld1.16             {q3}, [r10]!                                   @ load 8x16-bit filter values
+    vmovl.u8            q0, d0                                         @ unpack src values to 16-bit
+    vmovl.u8            q1, d2                                         @ unpack src values to 16-bit
+    vmull.s16           q8, d0, d4                                     @ srcp[filterPos[0] + {0..7}] * filter[{0..7}] (part 1)
+    vmull.s16           q9, d1, d5                                     @ srcp[filterPos[0] + {0..7}] * filter[{0..7}] (part 2)
+    vmull.s16           q10, d2, d6                                    @ srcp[filterPos[1] + {0..7}] * filter[{0..7}] (part 1)
+    vmull.s16           q11, d3, d7                                    @ srcp[filterPos[1] + {0..7}] * filter[{0..7}] (part 2)
+    vpadd.s32           d16, d16, d17                                  @ horizontal pair adding of the 8x32-bit multiplied values into 4x32-bit (part 1)
+    vpadd.s32           d17, d18, d19                                  @ horizontal pair adding of the 8x32-bit multiplied values into 4x32-bit (part 2)
+    vpadd.s32           d20, d20, d21                                  @ horizontal pair adding of the 8x32-bit multiplied values into 4x32-bit (part 1)
+    vpadd.s32           d21, d22, d23                                  @ horizontal pair adding of the 8x32-bit multiplied values into 4x32-bit (part 2)
+    vadd.s32            q4, q8                                         @ update val accumulator
+    vadd.s32            q5, q10                                        @ update val accumulator
+    add                 r0, #8                                         @ srcp += 8
+    subs                r7, #8                                         @ tmpfilterSize -= 8
+    bgt                 2b                                             @ loop until tmpfilterSize is consumed
+    mov                 r4, r10                                        @ filter = filter2
+    add                 r10, r10, r6, lsl #1                           @ filter2 += filterSize * 2
+    vpadd.s32           d8, d8, d9                                     @ horizontal pair adding of the 8x32-bit sums into 4x32-bit (part 1)
+    vpadd.s32           d9, d10, d11                                   @ horizontal pair adding of the 8x32-bit sums into 4x32-bit (part 2)
+    vpadd.s32           d8, d8, d9                                     @ horizontal pair adding of the 4x32-bit sums into 2x32-bit
+    vqshrn.s32          d8, q4, #7                                     @ shift and clip the 2x16-bit final values
+    vst1.32             {d8[0]},[r1]!                                  @ write destination
+    subs                r2, #2                                         @ dstW -= 2
+    bgt                 1b                                             @ loop until end of line
+    vpop                {q4-q7}
+    pop                 {r4-r12, lr}
+    mov pc, lr
+endfunc

libswscale/arm/swscale.c

+/*
+ * 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 "libswscale/swscale.h"
+#include "libswscale/swscale_internal.h"
+#include "libavutil/arm/cpu.h"
+
+void ff_hscale_8_to_15_neon(SwsContext *c, int16_t *dst, int dstW,
+                            const uint8_t *src, const int16_t *filter,
+                            const int32_t *filterPos, int filterSize);
+
+av_cold void ff_sws_init_swscale_arm(SwsContext *c)
+{
+    int cpu_flags = av_get_cpu_flags();
+
+    if (have_neon(cpu_flags)) {
+        if (c->srcBpc == 8 && c->dstBpc <= 14) {
+            c->hyScale = c->hcScale = ff_hscale_8_to_15_neon;
+        }
+    }
+}

libswscale/swscale.c

@@ -597,6 +597,8 @@ SwsFunc ff_getSwsFunc(SwsContext *c)
         ff_sws_init_swscale_x86(c);
     if (ARCH_AARCH64)
         ff_sws_init_swscale_aarch64(c);
+    if (ARCH_ARM)
+        ff_sws_init_swscale_arm(c);
 
     return swscale;
 }

libswscale/swscale_internal.h

@@ -892,6 +892,7 @@ void ff_sws_init_output_funcs(SwsContext *c,
 void ff_sws_init_swscale_ppc(SwsContext *c);
 void ff_sws_init_swscale_x86(SwsContext *c);
 void ff_sws_init_swscale_aarch64(SwsContext *c);
+void ff_sws_init_swscale_arm(SwsContext *c);
 
 void ff_hyscale_fast_c(SwsContext *c, int16_t *dst, int dstWidth,
                        const uint8_t *src, int srcW, int xInc);