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 #include "modules/audio_coding/neteq/tools/input_audio_file.h"
12
13 #include "rtc_base/checks.h"
14
15 namespace webrtc {
16 namespace test {
17
InputAudioFile(const std::string file_name,bool loop_at_end)18 InputAudioFile::InputAudioFile(const std::string file_name, bool loop_at_end)
19 : loop_at_end_(loop_at_end) {
20 fp_ = fopen(file_name.c_str(), "rb");
21 RTC_DCHECK(fp_) << file_name << " could not be opened.";
22 }
23
~InputAudioFile()24 InputAudioFile::~InputAudioFile() {
25 RTC_DCHECK(fp_);
26 fclose(fp_);
27 }
28
Read(size_t samples,int16_t * destination)29 bool InputAudioFile::Read(size_t samples, int16_t* destination) {
30 if (!fp_) {
31 return false;
32 }
33 size_t samples_read = fread(destination, sizeof(int16_t), samples, fp_);
34 if (samples_read < samples) {
35 if (!loop_at_end_) {
36 return false;
37 }
38 // Rewind and read the missing samples.
39 rewind(fp_);
40 size_t missing_samples = samples - samples_read;
41 if (fread(destination + samples_read, sizeof(int16_t), missing_samples,
42 fp_) < missing_samples) {
43 // Could not read enough even after rewinding the file.
44 return false;
45 }
46 }
47 return true;
48 }
49
Seek(int samples)50 bool InputAudioFile::Seek(int samples) {
51 if (!fp_) {
52 return false;
53 }
54 // Find file boundaries.
55 const long current_pos = ftell(fp_);
56 RTC_CHECK_NE(EOF, current_pos)
57 << "Error returned when getting file position.";
58 RTC_CHECK_EQ(0, fseek(fp_, 0, SEEK_END)); // Move to end of file.
59 const long file_size = ftell(fp_);
60 RTC_CHECK_NE(EOF, file_size) << "Error returned when getting file position.";
61 // Find new position.
62 long new_pos = current_pos + sizeof(int16_t) * samples; // Samples to bytes.
63 if (loop_at_end_) {
64 new_pos = new_pos % file_size; // Wrap around the end of the file.
65 if (new_pos < 0) {
66 // For negative values of new_pos, newpos % file_size will also be
67 // negative. To get the correct result it's needed to add file_size.
68 new_pos += file_size;
69 }
70 } else {
71 new_pos = new_pos > file_size ? file_size : new_pos; // Don't loop.
72 }
73 RTC_CHECK_GE(new_pos, 0)
74 << "Trying to move to before the beginning of the file";
75 // Move to new position relative to the beginning of the file.
76 RTC_CHECK_EQ(0, fseek(fp_, new_pos, SEEK_SET));
77 return true;
78 }
79
DuplicateInterleaved(const int16_t * source,size_t samples,size_t channels,int16_t * destination)80 void InputAudioFile::DuplicateInterleaved(const int16_t* source,
81 size_t samples,
82 size_t channels,
83 int16_t* destination) {
84 // Start from the end of |source| and |destination|, and work towards the
85 // beginning. This is to allow in-place interleaving of the same array (i.e.,
86 // |source| and |destination| are the same array).
87 for (int i = static_cast<int>(samples - 1); i >= 0; --i) {
88 for (int j = static_cast<int>(channels - 1); j >= 0; --j) {
89 destination[i * channels + j] = source[i];
90 }
91 }
92 }
93
94 } // namespace test
95 } // namespace webrtc
96