lavc/me_cmp: R-V V pix_abs

C908:
pix_abs_0_0_c: 534.0
pix_abs_0_0_rvv_i32: 136.2
pix_abs_1_0_c: 287.7
pix_abs_1_0_rvv_i32: 125.2
sad_0_c: 534.0
sad_0_rvv_i32: 136.2
sad_1_c: 287.7
sad_1_rvv_i32: 125.2

Signed-off-by: Rémi Denis-Courmont <remi@remlab.net>

libavcodec/me_cmp.c

@@ -1064,6 +1064,8 @@ av_cold void ff_me_cmp_init(MECmpContext *c, AVCodecContext *avctx)
     ff_me_cmp_init_arm(c, avctx);
 #elif ARCH_PPC
     ff_me_cmp_init_ppc(c, avctx);
+#elif ARCH_RISCV
+    ff_me_cmp_init_riscv(c, avctx);
 #elif ARCH_X86
     ff_me_cmp_init_x86(c, avctx);
 #elif ARCH_MIPS

libavcodec/me_cmp.h

@@ -86,6 +86,7 @@ void ff_me_cmp_init_aarch64(MECmpContext *c, AVCodecContext *avctx);
 void ff_me_cmp_init_alpha(MECmpContext *c, AVCodecContext *avctx);
 void ff_me_cmp_init_arm(MECmpContext *c, AVCodecContext *avctx);
 void ff_me_cmp_init_ppc(MECmpContext *c, AVCodecContext *avctx);
+void ff_me_cmp_init_riscv(MECmpContext *c, AVCodecContext *avctx);
 void ff_me_cmp_init_x86(MECmpContext *c, AVCodecContext *avctx);
 void ff_me_cmp_init_mips(MECmpContext *c, AVCodecContext *avctx);
 

libavcodec/riscv/Makefile

@@ -39,6 +39,8 @@ OBJS-$(CONFIG_LLVIDENCDSP) += riscv/llvidencdsp_init.o
 RVV-OBJS-$(CONFIG_LLVIDENCDSP) += riscv/llvidencdsp_rvv.o
 OBJS-$(CONFIG_LPC) += riscv/lpc_init.o
 RVV-OBJS-$(CONFIG_LPC) += riscv/lpc_rvv.o
+OBJS-$(CONFIG_ME_CMP) += riscv/me_cmp_init.o
+RVV-OBJS-$(CONFIG_ME_CMP) += riscv/me_cmp_rvv.o
 OBJS-$(CONFIG_OPUS_DECODER) += riscv/opusdsp_init.o
 RVV-OBJS-$(CONFIG_OPUS_DECODER) += riscv/opusdsp_rvv.o
 OBJS-$(CONFIG_PIXBLOCKDSP) += riscv/pixblockdsp_init.o

libavcodec/riscv/me_cmp_init.c

@@ -0,0 +1,46 @@
+/*
+ * Copyright (c) 2024 Institue of Software Chinese Academy of Sciences (ISCAS).
+ *
+ * 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 "libavutil/attributes.h"
+#include "libavutil/cpu.h"
+#include "libavutil/riscv/cpu.h"
+#include "libavcodec/me_cmp.h"
+#include "libavcodec/mpegvideo.h"
+
+int ff_pix_abs16_rvv(MpegEncContext *v, const uint8_t *pix1, const uint8_t *pix2,
+                              ptrdiff_t stride, int h);
+int ff_pix_abs8_rvv(MpegEncContext *v, const uint8_t *pix1, const uint8_t *pix2,
+                             ptrdiff_t stride, int h);
+
+av_cold void ff_me_cmp_init_riscv(MECmpContext *c, AVCodecContext *avctx)
+{
+#if HAVE_RVV
+    int flags = av_get_cpu_flags();
+
+    if (flags & AV_CPU_FLAG_RVV_I32 && ff_get_rv_vlenb() >= 16) {
+        c->pix_abs[0][0] = ff_pix_abs16_rvv;
+        c->sad[0] = ff_pix_abs16_rvv;
+        c->pix_abs[1][0] = ff_pix_abs8_rvv;
+        c->sad[1] = ff_pix_abs8_rvv;
+    }
+#endif
+}

libavcodec/riscv/me_cmp_rvv.S

@@ -0,0 +1,67 @@
+/*
+ * Copyright (c) 2024 Institue of Software Chinese Academy of Sciences (ISCAS).
+ *
+ * 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/riscv/asm.S"
+
+.macro pix_abs_ret
+        vsetivli        zero, 1, e32, m1, ta, ma
+        vmv.x.s         a0, v0
+        ret
+.endm
+
+func ff_pix_abs16_rvv, zve32x
+        vsetivli        zero, 1, e32, m1, ta, ma
+        vmv.s.x         v0, zero
+1:
+        vsetivli        zero, 16, e8, m1, tu, ma
+        vle8.v          v4, (a1)
+        vle8.v          v12, (a2)
+        addi            a4, a4, -1
+        vwsubu.vv       v16, v4, v12
+        add             a1, a1, a3
+        vwsubu.vv       v20, v12, v4
+        vsetvli         zero, zero, e16, m2, tu, ma
+        vmax.vv         v16, v16, v20
+        add             a2, a2, a3
+        vwredsum.vs     v0, v16, v0
+        bnez            a4, 1b
+
+        pix_abs_ret
+endfunc
+
+func ff_pix_abs8_rvv, zve32x
+        vsetivli        zero, 1, e32, m1, ta, ma
+        vmv.s.x         v0, zero
+1:
+        vsetivli        zero, 8, e8, mf2, tu, ma
+        vle8.v          v4, (a1)
+        vle8.v          v12, (a2)
+        addi            a4, a4, -1
+        vwsubu.vv       v16, v4, v12
+        add             a1, a1, a3
+        vwsubu.vv       v20, v12, v4
+        vsetvli         zero, zero, e16, m1, tu, ma
+        vmax.vv         v16, v16, v20
+        add             a2, a2, a3
+        vwredsum.vs     v0, v16, v0
+        bnez            a4, 1b
+
+        pix_abs_ret
+endfunc