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 WEBRTC_MODULES_AUDIO_CODING_NETEQ_TOOLS_AUDIO_LOOP_H_ 12 #define WEBRTC_MODULES_AUDIO_CODING_NETEQ_TOOLS_AUDIO_LOOP_H_ 13 14 #include <string> 15 16 #include "webrtc/base/constructormagic.h" 17 #include "webrtc/system_wrappers/interface/scoped_ptr.h" 18 #include "webrtc/typedefs.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: 27 AudioLoop() 28 : next_index_(0), 29 loop_length_samples_(0), 30 block_length_samples_(0) { 31 } 32 33 virtual ~AudioLoop() {} 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(const std::string file_name, size_t max_loop_length_samples, 41 size_t block_length_samples); 42 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(); 47 48 private: 49 size_t next_index_; 50 size_t loop_length_samples_; 51 size_t block_length_samples_; 52 scoped_ptr<int16_t[]> audio_array_; 53 54 DISALLOW_COPY_AND_ASSIGN(AudioLoop); 55 }; 56 57 } // namespace test 58 } // namespace webrtc 59 #endif // WEBRTC_MODULES_AUDIO_CODING_NETEQ_TOOLS_AUDIO_LOOP_H_ 60
