lavc/sbrdsp: R-V V sbr_hf_g_filt

hf_g_filt_c:      1552.5
hf_g_filt_rvv_f32: 679.5

libavcodec/riscv/sbrdsp_init.c

@@ -26,6 +26,8 @@
 void ff_sbr_sum64x5_rvv(float *z);
 float ff_sbr_sum_square_rvv(float (*x)[2], int n);
 void ff_sbr_neg_odd_64_rvv(float *x);
+void ff_sbr_hf_g_filt_rvv(float (*Y)[2], const float (*X_high)[40][2],
+                          const float *g_filt, int m_max, intptr_t ixh);
 
 av_cold void ff_sbrdsp_init_riscv(SBRDSPContext *c)
 {
@@ -35,6 +37,7 @@ av_cold void ff_sbrdsp_init_riscv(SBRDSPContext *c)
     if ((flags & AV_CPU_FLAG_RVV_F32) && (flags & AV_CPU_FLAG_RVB_ADDR)) {
         c->sum64x5 = ff_sbr_sum64x5_rvv;
         c->sum_square = ff_sbr_sum_square_rvv;
+        c->hf_g_filt = ff_sbr_hf_g_filt_rvv;
     }
 #if __riscv_xlen >= 64
     if ((flags & AV_CPU_FLAG_RVV_I64) && (flags & AV_CPU_FLAG_RVB_ADDR))

libavcodec/riscv/sbrdsp_rvv.S

@@ -84,3 +84,23 @@ func ff_sbr_neg_odd_64_rvv, zve64x
         ret
 endfunc
 #endif
+
+func ff_sbr_hf_g_filt_rvv, zve32f
+        li      t1, 40 * 2 * 4
+        sh3add  a1, a4, a1
+1:
+        vsetvli t0, a3, e32, m4, ta, ma
+        vlsseg2e32.v v16, (a1), t1
+        mul     t2, t0, t1
+        vle32.v v8, (a2)
+        sub     a3, a3, t0
+        vfmul.vv v16, v16, v8
+        add     a1, t2, a1
+        vfmul.vv v20, v20, v8
+        sh2add  a2, t0, a2
+        vsseg2e32.v v16, (a0)
+        sh3add  a0, t0, a0
+        bnez    a3, 1b
+
+        ret
+endfunc