Rename neteq4 folder to neteq

Keep the old neteq4/audio_decoder_unittests.isolate while waiting for
a hard-coded reference to change.

This CL effectively reverts r6257 "Rename neteq4 folder to neteq".

BUG=2996
TBR=tina.legrand@webrtc.org

Review URL: https://webrtc-codereview.appspot.com/21629004

git-svn-id: http://webrtc.googlecode.com/svn/trunk@6367 4adac7df-926f-26a2-2b94-8c16560cd09d

webrtc/modules/audio_coding/neteq/tools/audio_loop.h

@@ -0,0 +1,59 @@
+/*
+ *  Copyright (c) 2013 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_TOOLS_AUDIO_LOOP_H_
+#define WEBRTC_MODULES_AUDIO_CODING_NETEQ_TOOLS_AUDIO_LOOP_H_
+
+#include <string>
+
+#include "webrtc/base/constructormagic.h"
+#include "webrtc/system_wrappers/interface/scoped_ptr.h"
+#include "webrtc/typedefs.h"
+
+namespace webrtc {
+namespace test {
+
+// Class serving as an infinite source of audio, realized by looping an audio
+// clip.
+class AudioLoop {
+ public:
+  AudioLoop()
+      : next_index_(0),
+        loop_length_samples_(0),
+        block_length_samples_(0) {
+  }
+
+  virtual ~AudioLoop() {}
+
+  // Initializes the AudioLoop by reading from |file_name|. The loop will be no
+  // longer than |max_loop_length_samples|, if the length of the file is
+  // greater. Otherwise, the loop length is the same as the file length.
+  // The audio will be delivered in blocks of |block_length_samples|.
+  // Returns false if the initialization failed, otherwise true.
+  bool Init(const std::string file_name, size_t max_loop_length_samples,
+            size_t block_length_samples);
+
+  // Returns a pointer to the next block of audio. The number given as
+  // |block_length_samples| to the Init() function determines how many samples
+  // that can be safely read from the pointer.
+  const int16_t* GetNextBlock();
+
+ private:
+  size_t next_index_;
+  size_t loop_length_samples_;
+  size_t block_length_samples_;
+  scoped_ptr<int16_t[]> audio_array_;
+
+  DISALLOW_COPY_AND_ASSIGN(AudioLoop);
+};
+
+}  // namespace test
+}  // namespace webrtc
+#endif  // WEBRTC_MODULES_AUDIO_CODING_NETEQ_TOOLS_AUDIO_LOOP_H_