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