libavutil: Add new fixed dsp functions.

Add functions needed for implementation of fixed point aac dec.

Signed-off-by: Nedeljko Babic <nedeljko.babic@imgtec.com>
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

1 files changed, 62 insertions, 0 deletions

diff --git a/libavutil/fixed_dsp.c b/libavutil/fixed_dsp.c
index e0ea981d25..8b25156c05 100644
--- a/libavutil/fixed_dsp.c
+++ b/libavutil/fixed_dsp.c
@@ -47,6 +47,28 @@
 
 #include "fixed_dsp.h"
 
+static void vector_fmul_add_c(int *dst, const int *src0, const int *src1, const int *src2, int len){
+    int i;
+    int64_t accu;
+
+    for (i=0; i<len; i++) {
+        accu = (int64_t)src0[i] * src1[i];
+        dst[i] = src2[i] + (int)((accu + 0x40000000) >> 31);
+    }
+}
+
+static void vector_fmul_reverse_c(int *dst, const int *src0, const int *src1, int len)
+{
+    int i;
+    int64_t accu;
+
+    src1 += len-1;
+    for (i=0; i<len; i++) {
+        accu = (int64_t)src0[i] * src1[-i];
+        dst[i] = (int)((accu+0x40000000) >> 31);
+    }
+}
+
 static void vector_fmul_window_scaled_c(int16_t *dst, const int32_t *src0,
                                        const int32_t *src1, const int32_t *win,
                                        int len, uint8_t bits)
@@ -88,6 +110,41 @@ static void vector_fmul_window_c(int32_t *dst, const int32_t *src0,
     }
 }
 
+static void vector_fmul_c(int *dst, const int *src0, const int *src1, int len)
+{
+    int i;
+    int64_t accu;
+
+    for (i = 0; i < len; i++){
+        accu = (int64_t)src0[i] * src1[i];
+        dst[i] = (int)((accu+0x40000000) >> 31);
+    }
+}
+
+static int ff_scalarproduct_fixed_c(const int *v1, const int *v2, int len)
+{
+    /** p is initialized with 0x40000000 so that the proper rounding will occur
+      * at the end */
+    int64_t p = 0x40000000;
+    int i;
+
+    for (i = 0; i < len; i++)
+        p += (int64_t)v1[i] * v2[i];
+
+    return (int)(p >> 31);
+}
+
+static void butterflies_fixed_c(int *v1, int *v2, int len)
+{
+    int i;
+
+    for (i = 0; i < len; i++){
+        int t = v1[i] - v2[i];
+        v1[i] += v2[i];
+        v2[i] = t;
+    }
+}
+
 AVFixedDSPContext * avpriv_alloc_fixed_dsp(int bit_exact)
 {
     AVFixedDSPContext * fdsp = av_malloc(sizeof(AVFixedDSPContext));
@@ -97,6 +154,11 @@ AVFixedDSPContext * avpriv_alloc_fixed_dsp(int bit_exact)
 
     fdsp->vector_fmul_window_scaled = vector_fmul_window_scaled_c;
     fdsp->vector_fmul_window = vector_fmul_window_c;
+    fdsp->vector_fmul = vector_fmul_c;
+    fdsp->vector_fmul_add = vector_fmul_add_c;
+    fdsp->vector_fmul_reverse = vector_fmul_reverse_c;
+    fdsp->butterflies_fixed = butterflies_fixed_c;
+    fdsp->scalarproduct_fixed = ff_scalarproduct_fixed_c;
 
     return fdsp;
 }