avcodec: [loongarch] Optimize h264_chroma_mc with LASX.

./ffmpeg -i ../1_h264_1080p_30fps_3Mbps.mp4 -f rawvideo -y /dev/null -an
before:170
after :183

Change-Id: I42ff23cc2dc7c32bd1b7e4274da9d9ec87065f20
Reviewed-by: Shiyou Yin <yinshiyou-hf@loongson.cn>
Reviewed-by: guxiwei <guxiwei-hf@loongson.cn>
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>

libavcodec/h264chroma.c

@@ -56,4 +56,6 @@ av_cold void ff_h264chroma_init(H264ChromaContext *c, int bit_depth)
         ff_h264chroma_init_x86(c, bit_depth);
     if (ARCH_MIPS)
         ff_h264chroma_init_mips(c, bit_depth);
+    if (ARCH_LOONGARCH64)
+        ff_h264chroma_init_loongarch(c, bit_depth);
 }

libavcodec/h264chroma.h

@@ -36,5 +36,6 @@ void ff_h264chroma_init_arm(H264ChromaContext *c, int bit_depth);
 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);
 
 #endif /* AVCODEC_H264CHROMA_H */

libavcodec/loongarch/Makefile

@@ -0,0 +1,2 @@
+OBJS-$(CONFIG_H264CHROMA)             += loongarch/h264chroma_init_loongarch.o
+LASX-OBJS-$(CONFIG_H264CHROMA)        += loongarch/h264chroma_lasx.o

libavcodec/loongarch/h264chroma_init_loongarch.c

@@ -0,0 +1,37 @@
+/*
+ * Copyright (c) 2020 Loongson Technology Corporation Limited
+ * Contributed by Shiyou Yin <yinshiyou-hf@loongson.cn>
+ *
+ * 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 "h264chroma_lasx.h"
+#include "libavutil/attributes.h"
+#include "libavutil/loongarch/cpu.h"
+#include "libavcodec/h264chroma.h"
+
+av_cold void ff_h264chroma_init_loongarch(H264ChromaContext *c, int bit_depth)
+{
+    int cpu_flags = av_get_cpu_flags();
+    if (have_lasx(cpu_flags)) {
+        if (bit_depth <= 8) {
+            c->put_h264_chroma_pixels_tab[0] = ff_put_h264_chroma_mc8_lasx;
+            c->avg_h264_chroma_pixels_tab[0] = ff_avg_h264_chroma_mc8_lasx;
+            c->put_h264_chroma_pixels_tab[1] = ff_put_h264_chroma_mc4_lasx;
+        }
+    }
+}

libavcodec/loongarch/h264chroma_lasx.h

@@ -0,0 +1,36 @@
+/*
+ * Copyright (c) 2020 Loongson Technology Corporation Limited
+ * Contributed by Shiyou Yin <yinshiyou-hf@loongson.cn>
+ *
+ * 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
+ */
+
+#ifndef AVCODEC_LOONGARCH_H264CHROMA_LASX_H
+#define AVCODEC_LOONGARCH_H264CHROMA_LASX_H
+
+#include <stdint.h>
+#include <stddef.h>
+#include "libavcodec/h264.h"
+
+void ff_put_h264_chroma_mc4_lasx(uint8_t *dst, uint8_t *src, ptrdiff_t stride,
+        int h, int x, int y);
+void ff_put_h264_chroma_mc8_lasx(uint8_t *dst, uint8_t *src, ptrdiff_t stride,
+        int h, int x, int y);
+void ff_avg_h264_chroma_mc8_lasx(uint8_t *dst, uint8_t *src, ptrdiff_t stride,
+        int h, int x, int y);
+
+#endif /* AVCODEC_LOONGARCH_H264CHROMA_LASX_H */