[FFmpeg-devel,1/2] lavc/llauddsp: R-V V scalarproduct_and_madd_int16

diff --git a/libavcodec/lossless_audiodsp.c b/libavcodec/lossless_audiodsp.c
index 1daf2e4c12..b0d64cf5b3 100644
--- a/libavcodec/lossless_audiodsp.c
+++ b/libavcodec/lossless_audiodsp.c
@@ -63,6 +63,8 @@  av_cold void ff_llauddsp_init(LLAudDSPContext *c)
     ff_llauddsp_init_arm(c);
 #elif ARCH_PPC
     ff_llauddsp_init_ppc(c);
+#elif ARCH_RISCV
+    ff_llauddsp_init_riscv(c);
 #elif ARCH_X86
     ff_llauddsp_init_x86(c);
 #endif
diff --git a/libavcodec/lossless_audiodsp.h b/libavcodec/lossless_audiodsp.h
index eea5d49fa9..cf2d43d7c9 100644
--- a/libavcodec/lossless_audiodsp.h
+++ b/libavcodec/lossless_audiodsp.h
@@ -46,6 +46,7 @@  typedef struct LLAudDSPContext {
 void ff_llauddsp_init(LLAudDSPContext *c);
 void ff_llauddsp_init_arm(LLAudDSPContext *c);
 void ff_llauddsp_init_ppc(LLAudDSPContext *c);
+void ff_llauddsp_init_riscv(LLAudDSPContext *c);
 void ff_llauddsp_init_x86(LLAudDSPContext *c);
 
 #endif /* AVCODEC_LOSSLESS_AUDIODSP_H */
diff --git a/libavcodec/riscv/Makefile b/libavcodec/riscv/Makefile
index 2c9af16782..57c1708dbb 100644
--- a/libavcodec/riscv/Makefile
+++ b/libavcodec/riscv/Makefile
@@ -24,6 +24,8 @@  OBJS-$(CONFIG_HUFFYUV_DECODER) += riscv/huffyuvdsp_init.o
 RVV-OBJS-$(CONFIG_HUFFYUV_DECODER) += riscv/huffyuvdsp_rvv.o
 OBJS-$(CONFIG_IDCTDSP) += riscv/idctdsp_init.o
 RVV-OBJS-$(CONFIG_IDCTDSP) += riscv/idctdsp_rvv.o
+OBJS-$(CONFIG_LLAUDDSP) += riscv/llauddsp_init.o
+RVV-OBJS-$(CONFIG_LLAUDDSP) += riscv/llauddsp_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 \
diff --git a/libavcodec/riscv/llauddsp_init.c b/libavcodec/riscv/llauddsp_init.c
new file mode 100644
index 0000000000..ea023f73e6
--- /dev/null
+++ b/libavcodec/riscv/llauddsp_init.c
@@ -0,0 +1,40 @@ 
+/*
+ * Copyright © 2023 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 "config.h"
+
+#include "libavutil/attributes.h"
+#include "libavutil/cpu.h"
+#include "libavcodec/lossless_audiodsp.h"
+
+int32_t ff_scalarproduct_and_madd_int16_rvv(int16_t *v1, const int16_t *v2,
+                                            const int16_t *v3, int len,
+                                            int mul);
+
+av_cold void ff_llauddsp_init_riscv(LLAudDSPContext *c)
+{
+#if HAVE_RVV
+    int flags = av_get_cpu_flags();
+
+    if ((flags & AV_CPU_FLAG_RVV_I32)  && (flags & AV_CPU_FLAG_RVB_ADDR)) {
+        c->scalarproduct_and_madd_int16 = ff_scalarproduct_and_madd_int16_rvv;
+    }
+#endif
+}
diff --git a/libavcodec/riscv/llauddsp_rvv.S b/libavcodec/riscv/llauddsp_rvv.S
new file mode 100644
index 0000000000..74adb338a9
--- /dev/null
+++ b/libavcodec/riscv/llauddsp_rvv.S
@@ -0,0 +1,45 @@ 
+/*
+ * Copyright © 2023 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_scalarproduct_and_madd_int16_rvv, zve32x
+        vsetvli t0, zero, e32, m8, ta, ma
+        vmv.v.x v0, zero
+1:
+        vsetvli t0, a3, e16, m4, tu, ma
+        vle16.v v8, (a0)
+        sub     a3, a3, t0
+        vle16.v v16, (a1)
+        sh1add  a1, t0, a1
+        vwmacc.vv v0, v8, v16
+        vle16.v v24, (a2)
+        sh1add  a2, t0, a2
+        vmacc.vx v8, a4, v24
+        vse16.v v8, (a0)
+        sh1add  a0, t0, a0
+        bnez    a3, 1b
+
+        vsetvli t0, zero, e32, m8, ta, ma
+        vmv.s.x v8, zero
+        vredsum.vs v0, v0, v8
+        vmv.x.s a0, v0
+        ret
+endfunc