lavc/alacdsp: RISC-V V append_extra_bits[1]

libavcodec/riscv/alacdsp_init.c

@@ -31,6 +31,10 @@ void ff_alac_append_extra_bits_mono_rvv(int32_t *buffer[2],
                                         int32_t *extra_bits_buf[2],
                                         int extra_bits, int channels,
                                         int nb_samples);
+void ff_alac_append_extra_bits_stereo_rvv(int32_t *buffer[2],
+                                          int32_t *extra_bits_buf[2],
+                                          int extra_bits, int channels,
+                                          int nb_samples);
 
 av_cold void ff_alacdsp_init_riscv(ALACDSPContext *c)
 {
@@ -40,6 +44,7 @@ av_cold void ff_alacdsp_init_riscv(ALACDSPContext *c)
     if (flags & AV_CPU_FLAG_RVV_I32) {
         c->decorrelate_stereo = ff_alac_decorrelate_stereo_rvv;
         c->append_extra_bits[0] = ff_alac_append_extra_bits_mono_rvv;
+        c->append_extra_bits[1] = ff_alac_append_extra_bits_stereo_rvv;
     }
 #endif
 }

libavcodec/riscv/alacdsp_rvv.S

@@ -61,4 +61,31 @@ func ff_alac_append_extra_bits_mono_rvv, zve32x
 
         ret
 endfunc
+
+func ff_alac_append_extra_bits_stereo_rvv, zve32x
+        ld      a6, 8(a0)
+        ld      a0,  (a0)
+        ld      a7, 8(a1)
+        ld      a1,  (a1)
+1:
+        vsetvli t0, a4, e32, m1, ta, ma
+        vle32.v v16, (a0)
+        sub     a4, a4, t0
+        vle32.v v0, (a6)
+        vsll.vx v16, v16, a2
+        vsll.vx v0, v0, a2
+        vle32.v v24, (a1)
+        sh2add  a1, t0, a1
+        vle32.v v8, (a7)
+        sh2add  a7, t0, a7
+        vor.vv  v16, v24, v16
+        vor.vv  v0, v8, v0
+        vse32.v v16, (a0)
+        sh2add  a0, t0, a0
+        vse32.v v0, (a6)
+        sh2add  a6, t0, a6
+        bnez    a4, 1b
+
+        ret
+endfunc
 #endif