1 files changed, 135 insertions, 0 deletions
diff --git a/src/3rdparty/resonance-audio/resonance_audio/utils/buffer_unpartitioner.h b/src/3rdparty/resonance-audio/resonance_audio/utils/buffer_unpartitioner.h
new file mode 100644
index 000000000..51a5793d3
--- /dev/null
+++ b/src/3rdparty/resonance-audio/resonance_audio/utils/buffer_unpartitioner.h
@@ -0,0 +1,135 @@
+/*
+Copyright 2018 Google Inc. 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.
+*/
+
+#ifndef RESONANCE_AUDIO_UTILS_BUFFER_UNPARTITIONER_H_
+#define RESONANCE_AUDIO_UTILS_BUFFER_UNPARTITIONER_H_
+
+#include <functional>
+#include <memory>
+
+#include "base/audio_buffer.h"
+#include "base/logging.h"
+
+namespace vraudio {
+
+// Unpackages |AudioBuffer| into output buffers of arbitrary sizes.
+class BufferUnpartitioner {
+ public:
+  // Callback to obtain input |AudioBuffer|s. Returns a nullptr if no buffers
+  // are available.
+  typedef std::function<const AudioBuffer*()> GetBufferCallback;
+
+  // Constructor.
+  //
+  // @param num_channels Number of audio channels in input and output buffers.
+  // @param frames_per_buffer Number of frames per input buffer.
+  // @param buffer_callback Callback to receive output |AudioBuffer|s.
+  BufferUnpartitioner(size_t num_channels, size_t frames_per_buffer,
+                      GetBufferCallback buffer_callback);
+
+  // Returns the number of input buffers required for a given number of output
+  // frames and based on the current fill state of the internal |temp_buffer_|.
+  //
+  // @param num_output_frames Number of output frames.
+  // @return Number of required input |AudioBuffer|s.
+  size_t GetNumBuffersRequestedForNumInputFrames(
+      size_t num_output_frames) const;
+
+  // Returns the number of buffered frames in internal |temp_buffer_|.
+  size_t GetNumBufferedFrames() const;
+
+  // Requests an interleaved int16 output buffer. This method triggers
+  // |GetBufferCallback|.
+  //
+  // @param output_buffer Interleaved output buffer to write to.
+  // @param num_channels Number of channels in output buffer.
+  // @param num_frames Number of frames in output buffer.
+  // @return Number of frames actually written.
+  size_t GetBuffer(int16* output_buffer, size_t num_channels,
+                   size_t num_frames);
+
+  // Requests an interleaved float output buffer. This method triggers
+  // |GetBufferCallback|.
+  //
+  // @param output_buffer Interleaved output buffer to write to.
+  // @param num_channels Number of channels in output buffer.
+  // @param num_frames Number of frames in output buffer.
+  // @return Number of frames actually written.
+  size_t GetBuffer(float* output_buffer, size_t num_channels,
+                   size_t num_frames);
+
+  // Requests a planar int16 output buffer. This method triggers
+  // |GetBufferCallback|.
+  //
+  // @param output_buffer Planar output buffer to write to.
+  // @param num_channels Number of channels in output buffer.
+  // @param num_frames Number of frames in output buffer.
+  // @return Number of frames actually written.
+  size_t GetBuffer(int16** output_buffer, size_t num_channels,
+                   size_t num_frames);
+
+  // Requests a planar float output buffer. This method triggers
+  // |GetBufferCallback|.
+  //
+  // @param output_buffer Planar output buffer to write to.
+  // @param num_channels Number of channels in output buffer.
+  // @param num_frames Number of frames in output buffer.
+  // @return Number of frames actually written.
+  size_t GetBuffer(float** output_buffer, size_t num_channels,
+                   size_t num_frames);
+
+  // Clears internal temporary buffer that holds remaining audio frames.
+  void Clear();
+
+ private:
+  // Returns the number of frames that are buffered in |current_input_buffer_|.
+  //
+  // @return Number of frames in |current_input_buffer_|. If
+  //     |current_input_buffer_| is undefined, it returns 0.
+  size_t GetNumFramesAvailableInBuffer() const;
+
+  // Writes output buffer into target buffer. Supported buffer types are planar
+  // and interleaved floating point abd interleaved int16 output. This method
+  // triggers |GetBufferCallback|.
+  //
+  // @tparam BufferType Output buffer type.
+  // @param buffer Output buffer to write to.
+  // @param num_channels Number of channels in output buffer.
+  // @param num_frames Number of frames in output buffer.
+  // @return Number of frames actually written.
+  template <typename BufferType>
+  size_t GetBufferTemplated(BufferType buffer, size_t num_channels,
+                            size_t num_frames);
+
+  // Number of channels in output buffers.
+  const size_t num_channels_;
+
+  // Number of frames per buffer in output buffers.
+  const size_t frames_per_buffer_;
+
+  // Callback to request input |AudioBuffer|s.
+  const GetBufferCallback buffer_callback_;
+
+  // Temporary buffer containing remaining audio frames.
+  const AudioBuffer* current_input_buffer_;  // Not owned.
+
+  // Current read position in |current_input_buffer_|.
+  size_t current_buffer_read_offset_frames_;
+};
+
+}  // namespace vraudio
+
+#endif  // RESONANCE_AUDIO_UTILS_BUFFER_UNPARTITIONER_H_