Add NetEqInput::PacketData::ToString method

This new method prints information about the packet.

BUG=webrtc:7467

Review-Url: https://codereview.webrtc.org/2844283002
Cr-Commit-Position: refs/heads/master@{#17922}

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

@@ -0,0 +1,32 @@
+/*
+ *  Copyright (c) 2017 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/neteq_input.h"
+
+#include <sstream>
+
+namespace webrtc {
+namespace test {
+
+std::string NetEqInput::PacketData::ToString() const {
+  std::stringstream ss;
+  ss << "{"
+     << "time_ms: " << static_cast<int64_t>(time_ms) << ", "
+     << "header: {"
+     << "pt: " << static_cast<int>(header.payloadType) << ", "
+     << "sn: " << header.sequenceNumber << ", "
+     << "ts: " << header.timestamp << ", "
+     << "ssrc: " << header.ssrc << "}, "
+     << "payload bytes: " << payload.size() << "}";
+  return ss.str();
+}
+
+}  // namespace test
+}  // namespace webrtc