Reland of Moved ring-buffer related files from common_audio to audio_processing"

webrtc/common_audio/lapped_transform.h

Index: webrtc/common_audio/lapped_transform.h
diff --git a/webrtc/common_audio/lapped_transform.h b/webrtc/common_audio/lapped_transform.h
index 832735991befd208a516a304a7d64eca5292f3f8..18b77685a3f7a7bad1b9c8f5ec61a3fa669702ff 100644
--- a/webrtc/common_audio/lapped_transform.h
+++ b/webrtc/common_audio/lapped_transform.h
@@ -1,5 +1,5 @@
 /*
- *  Copyright (c) 2014 The WebRTC project authors. All Rights Reserved.
+ *  Copyright (c) 2016 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
@@ -11,115 +11,7 @@
 #ifndef WEBRTC_COMMON_AUDIO_LAPPED_TRANSFORM_H_
 #define WEBRTC_COMMON_AUDIO_LAPPED_TRANSFORM_H_
 
-#include <complex>
-#include <memory>
-
-#include "webrtc/common_audio/blocker.h"
-#include "webrtc/common_audio/real_fourier.h"
-#include "webrtc/system_wrappers/include/aligned_array.h"
-
-namespace webrtc {
-
-// Helper class for audio processing modules which operate on frequency domain
-// input derived from the windowed time domain audio stream.
-//
-// The input audio chunk is sliced into possibly overlapping blocks, multiplied
-// by a window and transformed with an FFT implementation. The transformed data
-// is supplied to the given callback for processing. The processed output is
-// then inverse transformed into the time domain and spliced back into a chunk
-// which constitutes the final output of this processing module.
-class LappedTransform {
- public:
-  class Callback {
-   public:
-    virtual ~Callback() {}
-
-    virtual void ProcessAudioBlock(const std::complex<float>* const* in_block,
-                                   size_t num_in_channels, size_t frames,
-                                   size_t num_out_channels,
-                                   std::complex<float>* const* out_block) = 0;
-  };
-
-  // Construct a transform instance. |chunk_length| is the number of samples in
-  // each channel. |window| defines the window, owned by the caller (a copy is
-  // made internally); |window| should have length equal to |block_length|.
-  // |block_length| defines the length of a block, in samples.
-  // |shift_amount| is in samples. |callback| is the caller-owned audio
-  // processing function called for each block of the input chunk.
-  LappedTransform(size_t num_in_channels,
-                  size_t num_out_channels,
-                  size_t chunk_length,
-                  const float* window,
-                  size_t block_length,
-                  size_t shift_amount,
-                  Callback* callback);
-  ~LappedTransform() {}
-
-  // Main audio processing helper method. Internally slices |in_chunk| into
-  // blocks, transforms them to frequency domain, calls the callback for each
-  // block and returns a de-blocked time domain chunk of audio through
-  // |out_chunk|. Both buffers are caller-owned.
-  void ProcessChunk(const float* const* in_chunk, float* const* out_chunk);
-
-  // Get the chunk length.
-  //
-  // The chunk length is the number of samples per channel that must be passed
-  // to ProcessChunk via the parameter in_chunk.
-  //
-  // Returns the same chunk_length passed to the LappedTransform constructor.
-  size_t chunk_length() const { return chunk_length_; }
-
-  // Get the number of input channels.
-  //
-  // This is the number of arrays that must be passed to ProcessChunk via
-  // in_chunk.
-  //
-  // Returns the same num_in_channels passed to the LappedTransform constructor.
-  size_t num_in_channels() const { return num_in_channels_; }
-
-  // Get the number of output channels.
-  //
-  // This is the number of arrays that must be passed to ProcessChunk via
-  // out_chunk.
-  //
-  // Returns the same num_out_channels passed to the LappedTransform
-  // constructor.
-  size_t num_out_channels() const { return num_out_channels_; }
-
- private:
-  // Internal middleware callback, given to the blocker. Transforms each block
-  // and hands it over to the processing method given at construction time.
-  class BlockThunk : public BlockerCallback {
-   public:
-    explicit BlockThunk(LappedTransform* parent) : parent_(parent) {}
-
-    virtual void ProcessBlock(const float* const* input,
-                              size_t num_frames,
-                              size_t num_input_channels,
-                              size_t num_output_channels,
-                              float* const* output);
-
-   private:
-    LappedTransform* const parent_;
-  } blocker_callback_;
-
-  const size_t num_in_channels_;
-  const size_t num_out_channels_;
-
-  const size_t block_length_;
-  const size_t chunk_length_;
-
-  Callback* const block_processor_;
-  Blocker blocker_;
-
-  std::unique_ptr<RealFourier> fft_;
-  const size_t cplx_length_;
-  AlignedArray<float> real_buf_;
-  AlignedArray<std::complex<float> > cplx_pre_;
-  AlignedArray<std::complex<float> > cplx_post_;
-};
-
-}  // namespace webrtc
+// TODO(peah): Remove as soon as all downstream dependencies are resolved.
+#include "webrtc/modules/audio_processing/utility/lapped_transform.h
 
 #endif  // WEBRTC_COMMON_AUDIO_LAPPED_TRANSFORM_H_
-