2 * Copyright (c) 2013 The WebRTC project authors. All Rights Reserved.
4 * Use of this source code is governed by a BSD-style license
5 * that can be found in the LICENSE file in the root of the source
6 * tree. An additional intellectual property rights grant can be found
7 * in the file PATENTS. All contributing project authors may
8 * be found in the AUTHORS file in the root of the source tree.
11 #ifndef WEBRTC_MODULES_AUDIO_CODING_NETEQ4_TOOLS_AUDIO_LOOP_H_
12 #define WEBRTC_MODULES_AUDIO_CODING_NETEQ4_TOOLS_AUDIO_LOOP_H_
16 #include "webrtc/system_wrappers/interface/constructor_magic.h"
17 #include "webrtc/system_wrappers/interface/scoped_ptr.h"
18 #include "webrtc/typedefs.h"
23 // Class serving as an infinite source of audio, realized by looping an audio
29 loop_length_samples_(0),
30 block_length_samples_(0) {
33 virtual ~AudioLoop() {}
35 // Initializes the AudioLoop by reading from |file_name|. The loop will be no
36 // longer than |max_loop_length_samples|, if the length of the file is
37 // greater. Otherwise, the loop length is the same as the file length.
38 // The audio will be delivered in blocks of |block_length_samples|.
39 // Returns false if the initialization failed, otherwise true.
40 bool Init(const std::string file_name, size_t max_loop_length_samples,
41 size_t block_length_samples);
43 // Returns a pointer to the next block of audio. The number given as
44 // |block_length_samples| to the Init() function determines how many samples
45 // that can be safely read from the pointer.
46 const int16_t* GetNextBlock();
50 size_t loop_length_samples_;
51 size_t block_length_samples_;
52 scoped_ptr<int16_t[]> audio_array_;
54 DISALLOW_COPY_AND_ASSIGN(AudioLoop);
59 #endif // WEBRTC_MODULES_AUDIO_CODING_NETEQ4_TOOLS_AUDIO_LOOP_H_