audio_loop.h (1922B)
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 <cstddef> 15 #include <cstdint> 16 #include <memory> 17 18 #include "absl/strings/string_view.h" 19 #include "api/array_view.h" 20 21 namespace webrtc { 22 namespace test { 23 24 // Class serving as an infinite source of audio, realized by looping an audio 25 // clip. 26 class AudioLoop { 27 public: 28 AudioLoop() 29 : next_index_(0), loop_length_samples_(0), block_length_samples_(0) {} 30 31 virtual ~AudioLoop() {} 32 33 AudioLoop(const AudioLoop&) = delete; 34 AudioLoop& operator=(const AudioLoop&) = delete; 35 36 // Initializes the AudioLoop by reading from `file_name`. The loop will be no 37 // longer than `max_loop_length_samples`, if the length of the file is 38 // greater. Otherwise, the loop length is the same as the file length. 39 // The audio will be delivered in blocks of `block_length_samples`. 40 // Returns false if the initialization failed, otherwise true. 41 bool Init(absl::string_view file_name, 42 size_t max_loop_length_samples, 43 size_t block_length_samples); 44 45 // Returns a (pointer,size) pair for the next block of audio. The size is 46 // equal to the `block_length_samples` Init() argument. 47 ArrayView<const int16_t> GetNextBlock(); 48 49 private: 50 size_t next_index_; 51 size_t loop_length_samples_; 52 size_t block_length_samples_; 53 std::unique_ptr<int16_t[]> audio_array_; 54 }; 55 56 } // namespace test 57 } // namespace webrtc 58 #endif // MODULES_AUDIO_CODING_NETEQ_TOOLS_AUDIO_LOOP_H_