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_INPUT_AUDIO_FILE_H_ 12 #define MODULES_AUDIO_CODING_NETEQ_TOOLS_INPUT_AUDIO_FILE_H_ 13 14 #include <stdio.h> 15 16 #include <string> 17 18 #include "rtc_base/constructor_magic.h" 19 20 namespace webrtc { 21 namespace test { 22 23 // Class for handling a looping input audio file. 24 class InputAudioFile { 25 public: 26 explicit InputAudioFile(const std::string file_name, bool loop_at_end = true); 27 28 virtual ~InputAudioFile(); 29 30 // Reads |samples| elements from source file to |destination|. Returns true 31 // if the read was successful, otherwise false. If the file end is reached, 32 // the file is rewound and reading continues from the beginning. 33 // The output |destination| must have the capacity to hold |samples| elements. 34 virtual bool Read(size_t samples, int16_t* destination); 35 36 // Fast-forwards (|samples| > 0) or -backwards (|samples| < 0) the file by the 37 // indicated number of samples. Just like Read(), Seek() starts over at the 38 // beginning of the file if the end is reached. However, seeking backwards 39 // past the beginning of the file is not possible. 40 virtual bool Seek(int samples); 41 42 // Creates a multi-channel signal from a mono signal. Each sample is repeated 43 // |channels| times to create an interleaved multi-channel signal where all 44 // channels are identical. The output |destination| must have the capacity to 45 // hold samples * channels elements. Note that |source| and |destination| can 46 // be the same array (i.e., point to the same address). 47 static void DuplicateInterleaved(const int16_t* source, 48 size_t samples, 49 size_t channels, 50 int16_t* destination); 51 52 private: 53 FILE* fp_; 54 const bool loop_at_end_; 55 RTC_DISALLOW_COPY_AND_ASSIGN(InputAudioFile); 56 }; 57 58 } // namespace test 59 } // namespace webrtc 60 #endif // MODULES_AUDIO_CODING_NETEQ_TOOLS_INPUT_AUDIO_FILE_H_ 61