1 /* 2 * Copyright (c) 2013 The WebRTC project authors. All Rights Reserved. 3 * 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. 9 */ 10 11 #ifndef MODULES_AUDIO_CODING_NETEQ_TOOLS_AUDIO_LOOP_H_ 12 #define MODULES_AUDIO_CODING_NETEQ_TOOLS_AUDIO_LOOP_H_ 13 14 #include <memory> 15 #include <string> 16 17 #include "absl/strings/string_view.h" 18 #include "api/array_view.h" 19 20 namespace webrtc { 21 namespace test { 22 23 // Class serving as an infinite source of audio, realized by looping an audio 24 // clip. 25 class AudioLoop { 26 public: AudioLoop()27 AudioLoop() 28 : next_index_(0), loop_length_samples_(0), block_length_samples_(0) {} 29 ~AudioLoop()30 virtual ~AudioLoop() {} 31 32 AudioLoop(const AudioLoop&) = delete; 33 AudioLoop& operator=(const AudioLoop&) = delete; 34 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(absl::string_view file_name, 41 size_t max_loop_length_samples, 42 size_t block_length_samples); 43 44 // Returns a (pointer,size) pair for the next block of audio. The size is 45 // equal to the `block_length_samples` Init() argument. 46 rtc::ArrayView<const int16_t> GetNextBlock(); 47 48 private: 49 size_t next_index_; 50 size_t loop_length_samples_; 51 size_t block_length_samples_; 52 std::unique_ptr<int16_t[]> audio_array_; 53 }; 54 55 } // namespace test 56 } // namespace webrtc 57 #endif // MODULES_AUDIO_CODING_NETEQ_TOOLS_AUDIO_LOOP_H_ 58