Move src/ -> webrtc/

TBR=niklas.enbom@webrtc.org Review URL: https://webrtc-codereview.appspot.com/915006 git-svn-id: http://webrtc.googlecode.com/svn/trunk@2963 4adac7df-926f-26a2-2b94-8c16560cd09d
2012-10-22 18:19:23 +00:00
parent 24a419c0c7
commit 14b43beb7c
1888 changed files with 23 additions and 23 deletions
--- a/webrtc/common_audio/signal_processing/include/real_fft.h
+++ b/webrtc/common_audio/signal_processing/include/real_fft.h
@ -0,0 +1,86 @@
+/*
+ *  Copyright (c) 2012 The WebRTC 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 WEBRTC_COMMON_AUDIO_SIGNAL_PROCESSING_INCLUDE_REAL_FFT_H_
+#define WEBRTC_COMMON_AUDIO_SIGNAL_PROCESSING_INCLUDE_REAL_FFT_H_
+
+#include "typedefs.h"
+
+struct RealFFT;
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+typedef int (*RealForwardFFT)(struct RealFFT* self,
+                              const int16_t* data_in,
+                              int16_t* data_out);
+typedef int (*RealInverseFFT)(struct RealFFT* self,
+                              const int16_t* data_in,
+                              int16_t* data_out);
+
+extern RealForwardFFT WebRtcSpl_RealForwardFFT;
+extern RealInverseFFT WebRtcSpl_RealInverseFFT;
+
+struct RealFFT* WebRtcSpl_CreateRealFFT(int order);
+void WebRtcSpl_FreeRealFFT(struct RealFFT* self);
+
+// TODO(kma): Implement FFT functions for real signals.
+
+// Compute the forward FFT for a complex signal of length 2^order.
+// Input Arguments:
+//   self - pointer to preallocated and initialized FFT specification structure.
+//   data_in - the input signal.
+//
+// Output Arguments:
+//   data_out - the output signal; must be different to data_in.
+//
+// Return Value:
+//   0  - FFT calculation is successful.
+//   -1 - Error
+//
+int WebRtcSpl_RealForwardFFTC(struct RealFFT* self,
+                              const int16_t* data_in,
+                              int16_t* data_out);
+
+#if (defined WEBRTC_DETECT_ARM_NEON) || (defined WEBRTC_ARCH_ARM_NEON)
+int WebRtcSpl_RealForwardFFTNeon(struct RealFFT* self,
+                                 const int16_t* data_in,
+                                 int16_t* data_out);
+#endif
+
+// Compute the inverse FFT for a complex signal of length 2^order.
+// Input Arguments:
+//   self - pointer to preallocated and initialized FFT specification structure.
+//   data_in - the input signal.
+//
+// Output Arguments:
+//   data_out - the output signal; must be different to data_in.
+//
+// Return Value:
+//   0 or a positive number - a value that the elements in the |data_out| should
+//                            be shifted left with in order to get correct
+//                            physical values.
+//   -1                     - Error
+int WebRtcSpl_RealInverseFFTC(struct RealFFT* self,
+                              const int16_t* data_in,
+                              int16_t* data_out);
+
+#if (defined WEBRTC_DETECT_ARM_NEON) || (defined WEBRTC_ARCH_ARM_NEON)
+int WebRtcSpl_RealInverseFFTNeon(struct RealFFT* self,
+                                 const int16_t* data_in,
+                                 int16_t* data_out);
+#endif
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif  // WEBRTC_COMMON_AUDIO_SIGNAL_PROCESSING_INCLUDE_REAL_FFT_H_