Add idct4

Change-Id: I1d1b6822452772cec95160491c7bc6d3bba1f5c2

vp10/common/vp10_inv_txfm1d.c

+/*
+ *  Copyright (c) 2015 The WebM project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#include "vp10/common/vp10_inv_txfm1d.h"
+#if CONFIG_COEFFICIENT_RANGE_CHECKING
+#define range_check(stage, input, buf, size, bit)                         \
+  {                                                                       \
+    int i, j;                                                             \
+    for (i = 0; i < size; ++i) {                                          \
+      int buf_bit = get_max_bit(abs(buf[i])) + 1;                         \
+      if (buf_bit > bit) {                                                \
+        printf("======== %s overflow ========\n", __func__);              \
+        printf("stage: %d node: %d\n", stage, i);                         \
+        printf("bit: %d buf_bit: %d buf[i]: %d\n", bit, buf_bit, buf[i]); \
+        printf("input:\n");                                               \
+        for (j = 0; j < size; j++) {                                      \
+          printf("%d,", input[j]);                                        \
+        }                                                                 \
+        printf("\n");                                                     \
+        assert(0, "vp10_inv_txfm1d.c: range_check overflow");             \
+      }                                                                   \
+    }                                                                     \
+  }
+#else
+#define range_check(stage, input, buf, size, bit) \
+  {                                               \
+    (void) stage;                                 \
+    (void) input;                                 \
+    (void) buf;                                   \
+    (void) size;                                  \
+    (void) bit;                                   \
+  }
+#endif
+
+void vp10_idct4_new(const int32_t *input, int32_t *output,
+                    const int8_t *cos_bit, const int8_t *stage_range) {
+  const int32_t size = 4;
+  const int32_t *cospi;
+
+  int32_t stage = 0;
+  int32_t *bf0, *bf1;
+  int32_t step[4];
+
+  // stage 0;
+  range_check(stage, input, input, size, stage_range[stage]);
+
+  // stage 1;
+  stage++;
+  bf1 = output;
+  bf1[0] = input[0];
+  bf1[1] = input[2];
+  bf1[2] = input[1];
+  bf1[3] = input[3];
+  range_check(stage, input, bf1, size, stage_range[stage]);
+
+  // stage 2
+  stage++;
+  cospi = cospi_arr[cos_bit[stage] - cos_bit_min];
+  bf0 = output;
+  bf1 = step;
+  bf1[0] = half_btf(cospi[32], bf0[0], cospi[32], bf0[1], cos_bit[stage]);
+  bf1[1] = half_btf(cospi[32], bf0[0], -cospi[32], bf0[1], cos_bit[stage]);
+  bf1[2] = half_btf(cospi[48], bf0[2], -cospi[16], bf0[3], cos_bit[stage]);
+  bf1[3] = half_btf(cospi[16], bf0[2], cospi[48], bf0[3], cos_bit[stage]);
+  range_check(stage, input, bf1, size, stage_range[stage]);
+
+  // stage 3
+  stage++;
+  bf0 = step;
+  bf1 = output;
+  bf1[0] = bf0[0] + bf0[3];
+  bf1[1] = bf0[1] + bf0[2];
+  bf1[2] = bf0[1] - bf0[2];
+  bf1[3] = bf0[0] - bf0[3];
+  range_check(stage, input, bf1, size, stage_range[stage]);
+}

vp10/common/vp10_inv_txfm1d.h

+/*
+ *  Copyright (c) 2015 The WebM project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#ifndef VP10_INV_TXFM1D_H_
+#define VP10_INV_TXFM1D_H_
+
+#include "vp10/common/vp10_txfm.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+void vp10_idct4_new(const int32_t *input, int32_t *output,
+                    const int8_t *cos_bit, const int8_t *stage_range);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif  // VP10_INV_TXFM1D_H_

vp10/vp10_common.mk

@@ -66,6 +66,8 @@ VP10_COMMON_SRCS-yes += common/vp10_fwd_txfm.c
 VP10_COMMON_SRCS-yes += common/vp10_txfm.h
 VP10_COMMON_SRCS-yes += common/vp10_fwd_txfm1d.h
 VP10_COMMON_SRCS-yes += common/vp10_fwd_txfm1d.c
+VP10_COMMON_SRCS-yes += common/vp10_inv_txfm1d.h
+VP10_COMMON_SRCS-yes += common/vp10_inv_txfm1d.c
 
 VP10_COMMON_SRCS-$(CONFIG_VP9_POSTPROC) += common/postproc.h
 VP10_COMMON_SRCS-$(CONFIG_VP9_POSTPROC) += common/postproc.c