1 files changed, 101 insertions, 0 deletions
diff --git a/chromium/third_party/webrtc/modules/audio_coding/neteq/sync_buffer.h b/chromium/third_party/webrtc/modules/audio_coding/neteq/sync_buffer.h
new file mode 100644
index 00000000000..59bd4d87e26
--- /dev/null
+++ b/chromium/third_party/webrtc/modules/audio_coding/neteq/sync_buffer.h
@@ -0,0 +1,101 @@
+/*
+ *  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_MODULES_AUDIO_CODING_NETEQ_SYNC_BUFFER_H_
+#define WEBRTC_MODULES_AUDIO_CODING_NETEQ_SYNC_BUFFER_H_
+
+#include "webrtc/base/constructormagic.h"
+#include "webrtc/modules/audio_coding/neteq/audio_multi_vector.h"
+#include "webrtc/typedefs.h"
+
+namespace webrtc {
+
+class SyncBuffer : public AudioMultiVector {
+ public:
+  SyncBuffer(size_t channels, size_t length)
+      : AudioMultiVector(channels, length),
+        next_index_(length),
+        end_timestamp_(0),
+        dtmf_index_(0) {}
+
+  virtual ~SyncBuffer() {}
+
+  // Returns the number of samples yet to play out form the buffer.
+  size_t FutureLength() const;
+
+  // Adds the contents of |append_this| to the back of the SyncBuffer. Removes
+  // the same number of samples from the beginning of the SyncBuffer, to
+  // maintain a constant buffer size. The |next_index_| is updated to reflect
+  // the move of the beginning of "future" data.
+  void PushBack(const AudioMultiVector& append_this);
+
+  // Adds |length| zeros to the beginning of each channel. Removes
+  // the same number of samples from the end of the SyncBuffer, to
+  // maintain a constant buffer size. The |next_index_| is updated to reflect
+  // the move of the beginning of "future" data.
+  // Note that this operation may delete future samples that are waiting to
+  // be played.
+  void PushFrontZeros(size_t length);
+
+  // Inserts |length| zeros into each channel at index |position|. The size of
+  // the SyncBuffer is kept constant, which means that the last |length|
+  // elements in each channel will be purged.
+  virtual void InsertZerosAtIndex(size_t length, size_t position);
+
+  // Overwrites each channel in this SyncBuffer with values taken from
+  // |insert_this|. The values are taken from the beginning of |insert_this| and
+  // are inserted starting at |position|. |length| values are written into each
+  // channel. The size of the SyncBuffer is kept constant. That is, if |length|
+  // and |position| are selected such that the new data would extend beyond the
+  // end of the current SyncBuffer, the buffer is not extended.
+  // The |next_index_| is not updated.
+  virtual void ReplaceAtIndex(const AudioMultiVector& insert_this,
+                              size_t length,
+                              size_t position);
+
+  // Same as the above method, but where all of |insert_this| is written (with
+  // the same constraints as above, that the SyncBuffer is not extended).
+  virtual void ReplaceAtIndex(const AudioMultiVector& insert_this,
+                              size_t position);
+
+  // Reads |requested_len| samples from each channel and writes them interleaved
+  // into |output|. The |next_index_| is updated to point to the sample to read
+  // next time.
+  size_t GetNextAudioInterleaved(size_t requested_len, int16_t* output);
+
+  // Adds |increment| to |end_timestamp_|.
+  void IncreaseEndTimestamp(uint32_t increment);
+
+  // Flushes the buffer. The buffer will contain only zeros after the flush, and
+  // |next_index_| will point to the end, like when the buffer was first
+  // created.
+  void Flush();
+
+  const AudioVector& Channel(size_t n) const { return *channels_[n]; }
+  AudioVector& Channel(size_t n) { return *channels_[n]; }
+
+  // Accessors and mutators.
+  size_t next_index() const { return next_index_; }
+  void set_next_index(size_t value);
+  uint32_t end_timestamp() const { return end_timestamp_; }
+  void set_end_timestamp(uint32_t value) { end_timestamp_ = value; }
+  size_t dtmf_index() const { return dtmf_index_; }
+  void set_dtmf_index(size_t value);
+
+ private:
+  size_t next_index_;
+  uint32_t end_timestamp_;  // The timestamp of the last sample in the buffer.
+  size_t dtmf_index_;  // Index to the first non-DTMF sample in the buffer.
+
+  DISALLOW_COPY_AND_ASSIGN(SyncBuffer);
+};
+
+}  // namespace webrtc
+#endif  // WEBRTC_MODULES_AUDIO_CODING_NETEQ_SYNC_BUFFER_H_