Add apply_window_int16() to DSPContext with x86-optimized versions and use it

in the ac3_fixed encoder.

1 files changed, 14 insertions, 0 deletions

diff --git a/libavcodec/dsputil.c b/libavcodec/dsputil.c
index 1627262c22..15925f656b 100644
--- a/libavcodec/dsputil.c
+++ b/libavcodec/dsputil.c
@@ -3890,6 +3890,19 @@ static int32_t scalarproduct_and_madd_int16_c(int16_t *v1, const int16_t *v2, co
     return res;
 }
 
+static void apply_window_int16_c(int16_t *output, const int16_t *input,
+                                 const int16_t *window, unsigned int len)
+{
+    int i;
+    int len2 = len >> 1;
+
+    for (i = 0; i < len2; i++) {
+        int16_t w       = window[i];
+        output[i]       = (MUL16(input[i],       w) + (1 << 14)) >> 15;
+        output[len-i-1] = (MUL16(input[len-i-1], w) + (1 << 14)) >> 15;
+    }
+}
+
 #define W0 2048
 #define W1 2841 /* 2048*sqrt (2)*cos (1*pi/16) */
 #define W2 2676 /* 2048*sqrt (2)*cos (2*pi/16) */
@@ -4364,6 +4377,7 @@ av_cold void dsputil_init(DSPContext* c, AVCodecContext *avctx)
     c->vector_clipf = vector_clipf_c;
     c->scalarproduct_int16 = scalarproduct_int16_c;
     c->scalarproduct_and_madd_int16 = scalarproduct_and_madd_int16_c;
+    c->apply_window_int16 = apply_window_int16_c;
     c->scalarproduct_float = scalarproduct_float_c;
     c->butterflies_float = butterflies_float_c;
     c->vector_fmul_scalar = vector_fmul_scalar_c;