swr: add int16_to_float_sse2()

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

libswresample/x86/audio_convert.asm

@@ -94,6 +94,40 @@ int32_to_float_u_int %+ SUFFIX
     REP_RET
 %endmacro
 
+%macro INT16_TO_FLOAT 1
+cglobal int16_to_float_%1, 3, 3, 4, dst, src, len
+    mov srcq, [srcq]
+    mov dstq, [dstq]
+%ifidn %1, a
+    test dstq, mmsize-1
+        jne int16_to_float_u_int %+ SUFFIX
+    test srcq, mmsize-1
+        jne int16_to_float_u_int %+ SUFFIX
+%else
+int16_to_float_u_int %+ SUFFIX
+%endif
+    add     dstq, lenq
+    shr     lenq, 1
+    add     srcq, lenq
+    neg     lenq
+    mova      m3, [flt2pm31]
+.next:
+    mov%1     m2, [srcq+lenq]
+    pxor      m0, m0
+    pxor      m1, m1
+    punpcklwd m0, m2
+    punpckhwd m1, m2
+    cvtdq2ps  m0, m0
+    cvtdq2ps  m1, m1
+    mulps m0, m3
+    mulps m1, m3
+    mov%1 [         dstq+2*lenq], m0
+    mov%1 [mmsize + dstq+2*lenq], m1
+    add lenq, mmsize
+        jl .next
+    REP_RET
+%endmacro
+
 
 INIT_MMX mmx
 INT16_TO_INT32 u
@@ -106,3 +140,5 @@ INT16_TO_INT32 a
 INIT_XMM sse2
 INT32_TO_FLOAT u
 INT32_TO_FLOAT a
+INT16_TO_FLOAT u
+INT16_TO_FLOAT a

libswresample/x86/swresample_x86.c

@@ -27,6 +27,7 @@ MULTI_CAPS_FUNC_DECL(mmx)
 MULTI_CAPS_FUNC_DECL(sse)
 
 void ff_int32_to_float_a_sse2(uint8_t **dst, const uint8_t **src, int len);
+void ff_int16_to_float_a_sse2(uint8_t **dst, const uint8_t **src, int len);
 
 void swri_audio_convert_init_x86(struct AudioConvert *ac,
                                  enum AVSampleFormat out_fmt,
@@ -50,5 +51,7 @@ MULTI_CAPS_FUNC(AV_CPU_FLAG_SSE, sse)
     if(mm_flags & AV_CPU_FLAG_SSE2) {
         if(   out_fmt == AV_SAMPLE_FMT_FLT  && in_fmt == AV_SAMPLE_FMT_S32 || out_fmt == AV_SAMPLE_FMT_FLTP && in_fmt == AV_SAMPLE_FMT_S32P)
             ac->simd_f =  ff_int32_to_float_a_sse2;
+        if(   out_fmt == AV_SAMPLE_FMT_FLT  && in_fmt == AV_SAMPLE_FMT_S16 || out_fmt == AV_SAMPLE_FMT_FLTP && in_fmt == AV_SAMPLE_FMT_S16P)
+            ac->simd_f =  ff_int16_to_float_a_sse2;
     }
 }