lavc/h264chroma: RISC-V V add motion compensation for 8x8 chroma blocks

Optimize the put and avg filtering for 8x8 chroma blocks
Signed-off-by: Arnie Chang <arnie.chang@sifive.com>

libavcodec/h264chroma.c

@@ -58,5 +58,7 @@ av_cold void ff_h264chroma_init(H264ChromaContext *c, int bit_depth)
     ff_h264chroma_init_mips(c, bit_depth);
 #elif ARCH_LOONGARCH64
     ff_h264chroma_init_loongarch(c, bit_depth);
+#elif ARCH_RISCV
+    ff_h264chroma_init_riscv(c, bit_depth);
 #endif
 }

libavcodec/h264chroma.h

@@ -37,5 +37,6 @@ void ff_h264chroma_init_ppc(H264ChromaContext *c, int bit_depth);
 void ff_h264chroma_init_x86(H264ChromaContext *c, int bit_depth);
 void ff_h264chroma_init_mips(H264ChromaContext *c, int bit_depth);
 void ff_h264chroma_init_loongarch(H264ChromaContext *c, int bit_depth);
+void ff_h264chroma_init_riscv(H264ChromaContext *c, int bit_depth);
 
 #endif /* AVCODEC_H264CHROMA_H */

libavcodec/riscv/Makefile

@@ -10,6 +10,8 @@ OBJS-$(CONFIG_BSWAPDSP) += riscv/bswapdsp_init.o \
 RVV-OBJS-$(CONFIG_BSWAPDSP) += riscv/bswapdsp_rvv.o
 OBJS-$(CONFIG_FMTCONVERT) += riscv/fmtconvert_init.o
 RVV-OBJS-$(CONFIG_FMTCONVERT) += riscv/fmtconvert_rvv.o
+OBJS-$(CONFIG_H264CHROMA) += riscv/h264_chroma_init_riscv.o
+RVV-OBJS-$(CONFIG_H264CHROMA) += riscv/h264_mc_chroma.o
 OBJS-$(CONFIG_IDCTDSP) += riscv/idctdsp_init.o
 RVV-OBJS-$(CONFIG_IDCTDSP) += riscv/idctdsp_rvv.o
 OBJS-$(CONFIG_OPUS_DECODER) += riscv/opusdsp_init.o

libavcodec/riscv/h264_chroma_init_riscv.c

+/*
+ * Copyright (c) 2023 SiFive, Inc. All rights reserved.
+ *
+ * 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/attributes.h"
+#include "libavutil/riscv/cpu.h"
+#include "libavcodec/h264chroma.h"
+#include "config.h"
+
+void h264_put_chroma_mc8_rvv(uint8_t *p_dst, const uint8_t *p_src, ptrdiff_t stride, int h, int x, int y);
+void h264_avg_chroma_mc8_rvv(uint8_t *p_dst, const uint8_t *p_src, ptrdiff_t stride, int h, int x, int y);
+
+av_cold void ff_h264chroma_init_riscv(H264ChromaContext *c, int bit_depth)
+{
+#if HAVE_RVV
+    int flags = av_get_cpu_flags();
+
+    if (bit_depth == 8 && (flags & AV_CPU_FLAG_RVV_I32) && ff_get_rv_vlenb() >= 16) {
+        c->put_h264_chroma_pixels_tab[0] = h264_put_chroma_mc8_rvv;
+        c->avg_h264_chroma_pixels_tab[0] = h264_avg_chroma_mc8_rvv;
+    }
+#endif
+}