Move mathutils.h to aom_dsp

The intent is to remove aom_dsp's dependency on av1 specific code.

BUG=aomedia:2734

Change-Id: I770bf90f5ecf160177fefd69aa5b89902fab80d1

aom_dsp/aom_dsp_common.h

diff --git a/aom_dsp/aom_dsp_common.h b/aom_dsp/aom_dsp_common.h
index 150d35d..efb634a 100644
--- a/aom_dsp/aom_dsp_common.h
+++ b/aom_dsp/aom_dsp_common.h
@@ -21,6 +21,8 @@
 extern "C" {
 #endif
 
+#define PI 3.141592653589793238462643383279502884
+
 #ifndef MAX_SB_SIZE
 #define MAX_SB_SIZE 128
 #endif  // ndef MAX_SB_SIZE

aom_dsp/mathutils.h

diff --git a/av1/encoder/mathutils.h b/aom_dsp/mathutils.h
similarity index 97%
rename from av1/encoder/mathutils.h
rename to aom_dsp/mathutils.h
index 576de07..86853c0 100644
--- a/av1/encoder/mathutils.h
+++ b/aom_dsp/mathutils.h
@@ -9,8 +9,8 @@
  * PATENTS file, you can obtain it at www.aomedia.org/license/patent.
  */
 
-#ifndef AOM_AV1_ENCODER_MATHUTILS_H_
-#define AOM_AV1_ENCODER_MATHUTILS_H_
+#ifndef AOM_DSP_MATHUTILS_H_
+#define AOM_DSP_MATHUTILS_H_
 
 #include <memory.h>
 #include <math.h>
@@ -18,6 +18,9 @@
 #include <stdlib.h>
 #include <assert.h>
 
+#include "aom_dsp/aom_dsp_common.h"
+#include "aom_mem/aom_mem.h"
+
 static const double TINY_NEAR_ZERO = 1.0E-16;
 
 // Solves Ax = b, where x and b are column vectors of size nx1 and A is nxn
@@ -356,4 +359,4 @@
   return 0;
 }
 
-#endif  // AOM_AV1_ENCODER_MATHUTILS_H_
+#endif  // AOM_DSP_MATHUTILS_H_

aom_dsp/noise_model.c

diff --git a/aom_dsp/noise_model.c b/aom_dsp/noise_model.c
index 19c660e..5930199 100644
--- a/aom_dsp/noise_model.c
+++ b/aom_dsp/noise_model.c
@@ -15,11 +15,10 @@
 #include <string.h>
 
 #include "aom_dsp/aom_dsp_common.h"
+#include "aom_dsp/mathutils.h"
 #include "aom_dsp/noise_model.h"
 #include "aom_dsp/noise_util.h"
 #include "aom_mem/aom_mem.h"
-#include "av1/common/common.h"
-#include "av1/encoder/mathutils.h"
 
 #define kLowPolyNumParams 3
 

av1/common/common.h

diff --git a/av1/common/common.h b/av1/common/common.h
index cc2da98..bb74924 100644
--- a/av1/common/common.h
+++ b/av1/common/common.h
@@ -26,8 +26,6 @@
 extern "C" {
 #endif
 
-#define PI 3.141592653589793238462643383279502884
-
 // Only need this for fixed-size arrays, for structs just assign.
 #define av1_copy(dest, src)              \
   {                                      \

av1/encoder/optical_flow.c

diff --git a/av1/encoder/optical_flow.c b/av1/encoder/optical_flow.c
index 56c78ec..3139a29 100644
--- a/av1/encoder/optical_flow.c
+++ b/av1/encoder/optical_flow.c
@@ -12,13 +12,15 @@
 #include <limits.h>
 
 #include "config/aom_config.h"
+
+#include "aom_dsp/mathutils.h"
+#include "aom_mem/aom_mem.h"
+
 #include "av1/common/av1_common_int.h"
 #include "av1/encoder/encoder.h"
-#include "av1/encoder/mathutils.h"
 #include "av1/encoder/optical_flow.h"
 #include "av1/encoder/sparse_linear_solver.h"
 #include "av1/encoder/reconinter_enc.h"
-#include "aom_mem/aom_mem.h"
 
 #if CONFIG_OPTICAL_FLOW_API
 

av1/encoder/pickrst.c

diff --git a/av1/encoder/pickrst.c b/av1/encoder/pickrst.c
index e965910..fc530b4 100644
--- a/av1/encoder/pickrst.c
+++ b/av1/encoder/pickrst.c
@@ -19,6 +19,7 @@
 
 #include "aom_dsp/aom_dsp_common.h"
 #include "aom_dsp/binary_codes_writer.h"
+#include "aom_dsp/mathutils.h"
 #include "aom_dsp/psnr.h"
 #include "aom_mem/aom_mem.h"
 #include "aom_ports/mem.h"
@@ -28,7 +29,6 @@
 
 #include "av1/encoder/av1_quantize.h"
 #include "av1/encoder/encoder.h"
-#include "av1/encoder/mathutils.h"
 #include "av1/encoder/picklpf.h"
 #include "av1/encoder/pickrst.h"
 

av1/encoder/ransac.c

diff --git a/av1/encoder/ransac.c b/av1/encoder/ransac.c
index 07e1a5f..ff00a46 100644
--- a/av1/encoder/ransac.c
+++ b/av1/encoder/ransac.c
@@ -15,8 +15,8 @@
 #include <stdlib.h>
 #include <assert.h>
 
+#include "aom_dsp/mathutils.h"
 #include "av1/encoder/ransac.h"
-#include "av1/encoder/mathutils.h"
 #include "av1/encoder/random.h"
 
 #define MAX_MINPTS 4