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 "api/array_view.h" 18 #include "rtc_base/constructor_magic.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 // Initializes the AudioLoop by reading from |file_name|. The loop will be no 33 // longer than |max_loop_length_samples|, if the length of the file is 34 // greater. Otherwise, the loop length is the same as the file length. 35 // The audio will be delivered in blocks of |block_length_samples|. 36 // Returns false if the initialization failed, otherwise true. 37 bool Init(const std::string file_name, 38 size_t max_loop_length_samples, 39 size_t block_length_samples); 40 41 // Returns a (pointer,size) pair for the next block of audio. The size is 42 // equal to the |block_length_samples| Init() argument. 43 rtc::ArrayView<const int16_t> GetNextBlock(); 44 45 private: 46 size_t next_index_; 47 size_t loop_length_samples_; 48 size_t block_length_samples_; 49 std::unique_ptr<int16_t[]> audio_array_; 50 51 RTC_DISALLOW_COPY_AND_ASSIGN(AudioLoop); 52 }; 53 54 } // namespace test 55 } // namespace webrtc 56 #endif // MODULES_AUDIO_CODING_NETEQ_TOOLS_AUDIO_LOOP_H_ 57