lavc/mpegvideoencdsp: R-V V pix_sum

T-Head C908:
pix_sum_c:      332.2
pix_sum_rvv_i64: 91.2

SpacemiT X60:
pix_sum_c:      321.2
pix_sum_rvv_i64: 60.9

libavcodec/mpegvideoencdsp.c

@@ -249,6 +249,8 @@ av_cold void ff_mpegvideoencdsp_init(MpegvideoEncDSPContext *c,
     ff_mpegvideoencdsp_init_arm(c, avctx);
 #elif ARCH_PPC
     ff_mpegvideoencdsp_init_ppc(c, avctx);
+#elif ARCH_RISCV
+    ff_mpegvideoencdsp_init_riscv(c, avctx);
 #elif ARCH_X86
     ff_mpegvideoencdsp_init_x86(c, avctx);
 #elif ARCH_MIPS

libavcodec/mpegvideoencdsp.h

@@ -50,6 +50,8 @@ void ff_mpegvideoencdsp_init_arm(MpegvideoEncDSPContext *c,
                                  AVCodecContext *avctx);
 void ff_mpegvideoencdsp_init_ppc(MpegvideoEncDSPContext *c,
                                  AVCodecContext *avctx);
+void ff_mpegvideoencdsp_init_riscv(MpegvideoEncDSPContext *c,
+                                   AVCodecContext *avctx);
 void ff_mpegvideoencdsp_init_x86(MpegvideoEncDSPContext *c,
                                  AVCodecContext *avctx);
 void ff_mpegvideoencdsp_init_mips(MpegvideoEncDSPContext *c,

libavcodec/riscv/Makefile

@@ -47,6 +47,8 @@ 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-$(CONFIG_MPEGVIDEOENC) += riscv/mpegvideoencdsp_init.o
+RVV-OBJS-$(CONFIG_MPEGVIDEOENC) += riscv/mpegvideoencdsp_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/mpegvideoencdsp_init.c

@@ -0,0 +1,38 @@
+/*
+ * Copyright © 2024 Rémi Denis-Courmont.
+ *
+ * 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 <stdint.h>
+
+#include "libavutil/cpu.h"
+#include "libavcodec/mpegvideoencdsp.h"
+
+int ff_pix_sum_rvv(const uint8_t *pix, int line_size);
+
+av_cold void ff_mpegvideoencdsp_init_riscv(MpegvideoEncDSPContext *c,
+                                           AVCodecContext *avctx)
+{
+#if HAVE_RVV
+    int flags = av_get_cpu_flags();
+
+    if ((flags & AV_CPU_FLAG_RVV_I64) && (flags & AV_CPU_FLAG_RVB) &&
+        ff_rv_vlen_least(128))
+        c->pix_sum = ff_pix_sum_rvv;
+#endif
+}

libavcodec/riscv/mpegvideoencdsp_rvv.S

@@ -0,0 +1,46 @@
+/*
+ * Copyright © 2024 Rémi Denis-Courmont.
+ *
+ * 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"
+
+func ff_pix_sum_rvv, zve64x, b
+        lpad    0
+        vsetivli    t0, 16, e16, m1, ta, ma
+        slli    t1, t0, 3
+        vlsseg2e64.v    v8, (a0), a1 # poor man's vlse128.v
+        li      t2, 16
+        vmv.s.x     v1, zero
+        vsetvli     zero, t1, e8, m4, ta, ma
+        vwaddu.vv   v16, v8, v12
+        beq     t0, t2, 2f # VLEN >= 256
+1:
+        sh3add  a0, a1, a0
+        vsetivli    zero, 8, e16, m1, ta, ma
+        vlsseg2e64.v    v8, (a0), a1
+        vsetvli     zero, t1, e8, m4, ta, ma
+        vwaddu.wv   v16, v16, v8
+        vwaddu.wv   v16, v16, v12
+2:
+        vsetvli     zero, zero, e16, m8, ta, ma
+        vredsum.vs  v1, v16, v1
+        vmv.x.s     a0, v1
+        zext.h      a0, a0
+        ret
+endfunc