NetEq: Implement logging of Delayed Packet Outage Events

webrtc/modules/audio_coding/neteq/tools/input_audio_file.cc

 /*
  *  Copyright (c) 2013 The WebRTC project authors. All Rights Reserved.
  *
  *  Use of this source code is governed by a BSD-style license
  *  that can be found in the LICENSE file in the root of the source
  *  tree. An additional intellectual property rights grant can be found
  *  in the file PATENTS.  All contributing project authors may
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
 #include "webrtc/modules/audio_coding/neteq/tools/input_audio_file.h"
 
+#include "webrtc/base/checks.h"
+
 namespace webrtc {
 namespace test {
 
 InputAudioFile::InputAudioFile(const std::string file_name) {
   fp_ = fopen(file_name.c_str(), "rb");
 }
 
 InputAudioFile::~InputAudioFile() { fclose(fp_); }
 
 bool InputAudioFile::Read(size_t samples, int16_t* destination) {
   if (!fp_) {
     return false;
   }
   size_t samples_read = fread(destination, sizeof(int16_t), samples, fp_);
   if (samples_read < samples) {
     // Rewind and read the missing samples.
     rewind(fp_);
     size_t missing_samples = samples - samples_read;
     if (fread(destination, sizeof(int16_t), missing_samples, fp_) <
         missing_samples) {
       // Could not read enough even after rewinding the file.
       return false;
     }
   }
   return true;
 }
 
+bool InputAudioFile::Seek(int samples) {
+  if (!fp_) {
+    return false;
+  }
+  // Find file boundaries.
+  const long current_pos = ftell(fp_);
+  CHECK_NE(EOF, current_pos) << "Error returned when getting file position.";
+  CHECK_EQ(0, fseek(fp_, 0, SEEK_END));  // Move to end of file.
+  const long file_size = ftell(fp_);
+  CHECK_NE(EOF, file_size) << "Error returned when getting file position.";
+  // Find new position.
+  long new_pos = current_pos + sizeof(int16_t) * samples;  // Samples to bytes.
+  CHECK_GE(new_pos, 0) << "Trying to move to before the beginning of the file";
+  new_pos = new_pos % file_size;  // Wrap around the end of the file.
+  // Move to new position relative to the beginning of the file.
+  CHECK_EQ(0, fseek(fp_, new_pos, SEEK_SET));
+  return true;
+}
+
 void InputAudioFile::DuplicateInterleaved(const int16_t* source, size_t samples,
                                           size_t channels,
                                           int16_t* destination) {
   // Start from the end of |source| and |destination|, and work towards the
   // beginning. This is to allow in-place interleaving of the same array (i.e.,
   // |source| and |destination| are the same array).
   for (int i = static_cast<int>(samples - 1); i >= 0; --i) {
     for (int j = static_cast<int>(channels - 1); j >= 0; --j) {
       destination[i * channels + j] = source[i];
     }
   }
 }
 
 }  // namespace test
 }  // namespace webrtc