diff --git a/libswresample/rematrix.c b/libswresample/rematrix.c
index 18e89c96ba..b9c5a4cf50 100644
--- a/libswresample/rematrix.c
+++ b/libswresample/rematrix.c
@@ -380,7 +380,7 @@ int swri_rematrix(SwrContext *s, AudioData *out, AudioData *in, int len, int mus
             in_i= s->matrix_ch[out_i][1];
             if(s->matrix[out_i][in_i]!=1.0){
                 if(s->mix_1_1_simd && len1)
-                    s->mix_1_1_simd(out->ch[out_i]    , in->ch[in_i]    , s->native_matrix, in->ch_count*out_i + in_i, len1);
+                    s->mix_1_1_simd(out->ch[out_i]    , in->ch[in_i]    , s->native_simd_matrix, in->ch_count*out_i + in_i, len1);
                 if(len != len1)
                     s->mix_1_1_f   (out->ch[out_i]+off, in->ch[in_i]+off, s->native_matrix, in->ch_count*out_i + in_i, len-len1);
             }else if(mustcopy){
diff --git a/libswresample/x86/rematrix.asm b/libswresample/x86/rematrix.asm
index e6f0b2fab6..c96ce49d9e 100644
--- a/libswresample/x86/rematrix.asm
+++ b/libswresample/x86/rematrix.asm
@@ -21,6 +21,12 @@
 %include "libavutil/x86/x86inc.asm"
 %include "libavutil/x86/x86util.asm"
 
+
+SECTION_RODATA
+align 32
+dw1: times 8  dd 1
+w1 : times 16 dw 1
+
 SECTION .text
 
 %macro MIX2_FLT 1
@@ -99,6 +105,63 @@ mix_1_1_float_u_int %+ SUFFIX
     REP_RET
 %endmacro
 
+%macro MIX1_INT16 1
+cglobal mix_1_1_%1_int16, 5, 5, 6, out, in, coeffp, index, len
+%ifidn %1, a
+    test inq, mmsize-1
+        jne mix_1_1_int16_u_int %+ SUFFIX
+    test outq, mmsize-1
+        jne mix_1_1_int16_u_int %+ SUFFIX
+%else
+mix_1_1_int16_u_int %+ SUFFIX
+%endif
+    movd   m4, [coeffpq + 4*indexq]
+    SPLATW m5, m4
+    psllq  m4, 32
+    psrlq  m4, 48
+    mova   m0, [w1]
+    psllw  m0, m4
+    psrlw  m0, 1
+    punpcklwd m5, m0
+    add lenq    , lenq
+    add inq     , lenq
+    add outq    , lenq
+    neg lenq
+.next:
+    mov%1        m0, [inq + lenq         ]
+    mov%1        m2, [inq + lenq + mmsize]
+    mova         m1, m0
+    mova         m3, m2
+    punpcklwd    m0, [w1]
+    punpckhwd    m1, [w1]
+    punpcklwd    m2, [w1]
+    punpckhwd    m3, [w1]
+    pmaddwd      m0, m5
+    pmaddwd      m1, m5
+    pmaddwd      m2, m5
+    pmaddwd      m3, m5
+    psrad        m0, m4
+    psrad        m1, m4
+    psrad        m2, m4
+    psrad        m3, m4
+    packssdw     m0, m1
+    packssdw     m2, m3
+    mov%1  [outq + lenq         ], m0
+    mov%1  [outq + lenq + mmsize], m2
+    add        lenq, mmsize*2
+        jl .next
+%if mmsize == 8
+    emms
+    RET
+%else
+    REP_RET
+%endif
+%endmacro
+
+INIT_MMX mmx
+MIX1_INT16 u
+MIX1_INT16 a
+
 INIT_XMM sse
 MIX2_FLT u
 MIX2_FLT a
diff --git a/libswresample/x86/swresample_x86.c b/libswresample/x86/swresample_x86.c
index 18c601f72e..ba0f1f131a 100644
--- a/libswresample/x86/swresample_x86.c
+++ b/libswresample/x86/swresample_x86.c
@@ -163,6 +163,21 @@ void swri_rematrix_init_x86(struct SwrContext *s){
     s->mix_2_1_simd = NULL;
 
     if (s->midbuf.fmt == AV_SAMPLE_FMT_S16P){
+        if(mm_flags & AV_CPU_FLAG_MMX) {
+            s->mix_1_1_simd = ff_mix_1_1_a_int16_mmx;
+        }
+        s->native_simd_matrix = av_mallocz(2 * num * sizeof(int16_t));
+        for(i=0; i<nb_out; i++){
+            int sh = 0;
+            for(j=0; j<nb_in; j++)
+                sh = FFMAX(sh, FFABS(((int*)s->native_matrix)[i * nb_in + j]));
+            sh = FFMAX(av_log2(sh) - 14, 0);
+            for(j=0; j<nb_in; j++) {
+                ((int16_t*)s->native_simd_matrix)[2*(i * nb_in + j)+1] = 15 - sh;
+                ((int16_t*)s->native_simd_matrix)[2*(i * nb_in + j)] =
+                    ((((int*)s->native_matrix)[i * nb_in + j]) + (1<<sh>>1)) >> sh;
+            }
+        }
     } else if(s->midbuf.fmt == AV_SAMPLE_FMT_FLTP){
         if(mm_flags & AV_CPU_FLAG_SSE) {
             s->mix_1_1_simd = ff_mix_1_1_a_float_sse;