[FFmpeg-devel,2/3] lavc/jpeg2000dsp: R-V V ict_float

diff --git a/libavcodec/jpeg2000dsp.c b/libavcodec/jpeg2000dsp.c
index 50bc1ecee6..7840fdc357 100644
--- a/libavcodec/jpeg2000dsp.c
+++ b/libavcodec/jpeg2000dsp.c
@@ -96,7 +96,9 @@  av_cold void ff_jpeg2000dsp_init(Jpeg2000DSPContext *c)
     c->mct_decode[FF_DWT53]     = rct_int;
     c->mct_decode[FF_DWT97_INT] = ict_int;
 
-#if ARCH_X86
+#if ARCH_RISCV
+    ff_jpeg2000dsp_init_riscv(c);
+#elif ARCH_X86
     ff_jpeg2000dsp_init_x86(c);
 #endif
 }
diff --git a/libavcodec/jpeg2000dsp.h b/libavcodec/jpeg2000dsp.h
index 932dbb2102..6854c7762d 100644
--- a/libavcodec/jpeg2000dsp.h
+++ b/libavcodec/jpeg2000dsp.h
@@ -33,6 +33,7 @@  typedef struct Jpeg2000DSPContext {
 extern const float ff_jpeg2000_f_ict_params[4];
 
 void ff_jpeg2000dsp_init(Jpeg2000DSPContext *c);
+void ff_jpeg2000dsp_init_riscv(Jpeg2000DSPContext *c);
 void ff_jpeg2000dsp_init_x86(Jpeg2000DSPContext *c);
 
 #endif /* AVCODEC_JPEG2000DSP_H */
diff --git a/libavcodec/riscv/Makefile b/libavcodec/riscv/Makefile
index 9c31c901cf..06815d3170 100644
--- a/libavcodec/riscv/Makefile
+++ b/libavcodec/riscv/Makefile
@@ -16,6 +16,8 @@  OBJS-$(CONFIG_FMTCONVERT) += riscv/fmtconvert_init.o
 RVV-OBJS-$(CONFIG_FMTCONVERT) += riscv/fmtconvert_rvv.o
 OBJS-$(CONFIG_G722DSP) += riscv/g722dsp_init.o
 RVV-OBJS-$(CONFIG_G722DSP) += riscv/g722dsp_rvv.o
+OBJS-$(CONFIG_JPEG2000_DECODER) += riscv/jpeg2000dsp_init.o
+RVV-OBJS-$(CONFIG_JPEG2000_DECODER) += riscv/jpeg2000dsp_rvv.o
 OBJS-$(CONFIG_H264CHROMA) += riscv/h264_chroma_init_riscv.o
 RVV-OBJS-$(CONFIG_H264CHROMA) += riscv/h264_mc_chroma.o
 OBJS-$(CONFIG_HUFFYUV_DECODER) += riscv/huffyuvdsp_init.o
diff --git a/libavcodec/riscv/jpeg2000dsp_init.c b/libavcodec/riscv/jpeg2000dsp_init.c
new file mode 100644
index 0000000000..9415a22f79
--- /dev/null
+++ b/libavcodec/riscv/jpeg2000dsp_init.c
@@ -0,0 +1,36 @@ 
+/*
+ * 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/jpeg2000dsp.h"
+
+void ff_ict_float_rvv(void *src0, void *src1, void *src2, int csize);
+
+av_cold void ff_jpeg2000dsp_init_riscv(Jpeg2000DSPContext *c)
+{
+#if HAVE_RVV
+    int flags = av_get_cpu_flags();
+
+    if ((flags & AV_CPU_FLAG_RVV_F32) && (flags & AV_CPU_FLAG_RVB_ADDR))
+        c->mct_decode[FF_DWT97] = ff_ict_float_rvv;
+#endif
+}
diff --git a/libavcodec/riscv/jpeg2000dsp_rvv.S b/libavcodec/riscv/jpeg2000dsp_rvv.S
new file mode 100644
index 0000000000..d10ebd491f
--- /dev/null
+++ b/libavcodec/riscv/jpeg2000dsp_rvv.S
@@ -0,0 +1,49 @@ 
+/*
+ * 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_ict_float_rvv, zve32f
+        lla     t0, ff_jpeg2000_f_ict_params
+        flw     ft0,  0(t0)
+        flw     ft1,  4(t0)
+        flw     ft2,  8(t0)
+        flw     ft3, 12(t0)
+1:
+        vsetvli t0, a3, e32, m8, ta, ma
+        vle32.v v8, (a0)
+        sub     a3, a3, t0
+        vle32.v v16, (a1)
+        vle32.v v24, (a2)
+        vfmul.vf v0, v16, ft1
+        vfmadd.vf v16, ft3, v8
+        vfsub.vv v0, v8, v0
+        vfmacc.vf v8, ft0, v24
+        vfnmsac.vf v0, ft2, v24
+        vse32.v v8, (a0)
+        sh2add  a0, t0, a0
+        vse32.v v0, (a1)
+        sh2add  a1, t0, a1
+        vse32.v v16, (a2)
+        sh2add  a2, t0, a2
+        bnez    a3, 1b
+
+        ret
+endfunc