NetEq: Implement logging of Delayed Packet Outage Events

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

Index: webrtc/modules/audio_coding/neteq/tools/input_audio_file.cc
diff --git a/webrtc/modules/audio_coding/neteq/tools/input_audio_file.cc b/webrtc/modules/audio_coding/neteq/tools/input_audio_file.cc
index 6bbb3286e4943b38d32e4a7244458cf90518e9d9..e2ec419b24d828b2fd1ff1af50ccb0f27906d22d 100644
--- a/webrtc/modules/audio_coding/neteq/tools/input_audio_file.cc
+++ b/webrtc/modules/audio_coding/neteq/tools/input_audio_file.cc
@@ -10,6 +10,8 @@
 
 #include "webrtc/modules/audio_coding/neteq/tools/input_audio_file.h"
 
+#include "webrtc/base/checks.h"
+
 namespace webrtc {
 namespace test {
 
@@ -37,6 +39,25 @@ bool InputAudioFile::Read(size_t samples, int16_t* destination) {
   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) {