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/array_view.h" 17 #include "webrtc/base/constructormagic.h" 18 #include "webrtc/base/scoped_ptr.h" 19 #include "webrtc/typedefs.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: AudioLoop()28 AudioLoop() 29 : next_index_(0), 30 loop_length_samples_(0), 31 block_length_samples_(0) { 32 } 33 ~AudioLoop()34 virtual ~AudioLoop() {} 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(const std::string file_name, 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 rtc::scoped_ptr<int16_t[]> audio_array_; 53 54 RTC_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