chore: import upstream snapshot with attribution

third_party/fft2d/BUILD.bazel

@@ -0,0 +1,39 @@
+# Headers for 2D Fast Fourier Transform package
+# from http://momonga.t.u-tokyo.ac.jp/~ooura/fft2d.html
+# This is a separate package because the original downloaded archive doesn't
+# contain any header files.
+
+package(
+    default_visibility = ["//visibility:public"],
+)
+
+# Unrestricted use; can only distribute original package.
+# See fft/readme.txt
+licenses(["notice"])
+
+exports_files(["LICENSE"])
+
+cc_library(
+    name = "fft2d_headers",
+    srcs = [
+        "fft.h",
+        "fft2d.h",
+    ],
+)
+
+objc_library(
+    name = "fft2d_headersd_ios",
+    srcs = [
+        "fft.h",
+        "fft2d.h",
+    ],
+)
+
+# Export the source code so that it could be compiled for Andoid native apps.
+filegroup(
+    name = "fft2d_headers_srcs",
+    srcs = [
+        "fft.h",
+        "fft2d.h",
+    ],
+)

third_party/fft2d/LICENSE

@@ -0,0 +1,3 @@
+Copyright(C) 1997,2001 Takuya OOURA (email: ooura@kurims.kyoto-u.ac.jp).
+You may use, copy, modify this code for any purpose and 
+without fee. You may distribute this ORIGINAL package.

third_party/fft2d/fft.h

@@ -0,0 +1,36 @@
+/* Copyright 2017 The TensorFlow Authors. All Rights Reserved.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+==============================================================================*/
+
+// Declarations for 1D FFT routines in third_party/fft2d/fft2d.
+
+#ifndef FFT2D_FFT_H__
+#define FFT2D_FFT_H__
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+extern void cdft(int, int, double *, int *, double *);
+extern void rdft(int, int, double *, int *, double *);
+extern void ddct(int, int, double *, int *, double *);
+extern void ddst(int, int, double *, int *, double *);
+extern void dfct(int, double *, double *, int *, double *);
+extern void dfst(int, double *, double *, int *, double *);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif  // FFT2D_FFT_H__

third_party/fft2d/fft2d.BUILD

@@ -0,0 +1,45 @@
+# 2D Fast Fourier Transform package
+# from http://momonga.t.u-tokyo.ac.jp/~ooura/fft2d.html
+
+package(
+    default_visibility = ["//visibility:public"],
+)
+
+# Unrestricted use; can only distribute original package.
+licenses(["notice"])
+
+exports_files(["readme2d.txt"])
+
+FFT2D_SRCS = [
+    "fftsg.c",
+    "fftsg2d.c",
+]
+
+config_setting(
+    name = "windows",
+    values = {"cpu": "x64_windows"},
+)
+
+# This is the main 2D FFT library.  The 2D FFTs in this library call
+# 1D FFTs.  In addition, fast DCTs are provided for the special case
+# of 8x8 and 16x16.  This code in this library is referred to as
+# "Version II" on http://momonga.t.u-tokyo.ac.jp/~ooura/fft2d.html.
+cc_library(
+    name = "fft2d",
+    srcs = FFT2D_SRCS,
+    linkopts = select({
+        ":windows": [],
+        "//conditions:default": ["-lm"],
+    }),
+)
+
+objc_library(
+    name = "fft2d_ios",
+    srcs = FFT2D_SRCS,
+)
+
+# Export the source code so that it could be compiled for Andoid native apps.
+filegroup(
+    name = "fft2d_srcs",
+    srcs = FFT2D_SRCS,
+)

third_party/fft2d/fft2d.h

@@ -0,0 +1,38 @@
+/* Copyright 2017 The TensorFlow Authors. All Rights Reserved.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+==============================================================================*/
+
+// Declarations for 2D FFT routines in third_party/fft2d/fft2d.
+
+#ifndef FFT2D_FFT_H__
+#define FFT2D_FFT_H__
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+extern void cdft2d(int, int, int, double **, double *, int *, double *);
+extern void rdft2d(int, int, int, double **, double *, int *, double *);
+extern void ddct2d(int, int, int, double **, double *, int *, double *);
+extern void ddst2d(int, int, int, double **, double *, int *, double *);
+extern void rdft2dsort(int, int, int, double **);
+extern void ddct8x8s(int isgn, double **a);
+extern void ddct16x16s(int isgn, double **a);
+
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif  // FFT2D_FFT_H__

third_party/fft2d/workspace.bzl

@@ -0,0 +1,14 @@
+"""FFT2D"""
+
+load("//third_party:repo.bzl", "tf_http_archive", "tf_mirror_urls")
+
+def repo():
+    # LINT.IfChange
+    tf_http_archive(
+        name = "fft2d",
+        build_file = "//third_party/fft2d:fft2d.BUILD",
+        sha256 = "5f4dabc2ae21e1f537425d58a49cdca1c49ea11db0d6271e2a4b27e9697548eb",
+        strip_prefix = "OouraFFT-1.0",
+        urls = tf_mirror_urls("https://github.com/petewarden/OouraFFT/archive/v1.0.tar.gz"),
+    )
+    # LINT.ThenChange(//tensorflow/lite/tools/cmake/modules/fft2d.cmake)