rtcp::Pli moved into own file and got a Parse function

webrtc/modules/rtp_rtcp/source/rtcp_packet/pli_unittest.cc

+/*
+ *  Copyright (c) 2015 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/rtp_rtcp/source/rtcp_packet/pli.h"
+
+#include "testing/gtest/include/gtest/gtest.h"
+#include "webrtc/modules/rtp_rtcp/source/rtcp_utility.h"
+
+using webrtc::rtcp::Pli;
+using webrtc::rtcp::RawPacket;
+using webrtc::RTCPUtility::RtcpCommonHeader;
+using webrtc::RTCPUtility::RtcpParseCommonHeader;
+
+namespace webrtc {
+namespace {
+
+const uint32_t kSenderSsrc = 0x12345678;
+const uint32_t kRemoteSsrc = 0x23456789;
+// Manually created Pli packet matching constants above.
+const uint8_t kPacket[] = {0x81, 206,  0x00, 0x02,
+                           0x12, 0x34, 0x56, 0x78,
+                           0x23, 0x45, 0x67, 0x89};
+const size_t kPacketLength = sizeof(kPacket);
+
+TEST(RtcpPacketPliTest, Parse) {
+  RtcpCommonHeader header;
+  EXPECT_TRUE(RtcpParseCommonHeader(kPacket, kPacketLength, &header));
+  Pli mutable_parsed;
+  EXPECT_TRUE(mutable_parsed.Parse(
+      header, kPacket + RtcpCommonHeader::kHeaderSizeBytes));
+  const Pli& parsed = mutable_parsed;  // Read values from constant object.
+
+  EXPECT_EQ(kSenderSsrc, parsed.sender_ssrc());
+  EXPECT_EQ(kRemoteSsrc, parsed.media_ssrc());
+}
+
+TEST(RtcpPacketPliTest, Create) {
+  Pli pli;
+  pli.From(kSenderSsrc);
+  pli.To(kRemoteSsrc);
+
+  rtc::scoped_ptr<RawPacket> packet(pli.Build());
+
+  ASSERT_EQ(kPacketLength, packet->Length());
+  EXPECT_EQ(0, memcmp(kPacket, packet->Buffer(), kPacketLength));
+}
+
+TEST(RtcpPacketPliTest, ParseFailsOnTooSmallPacket) {
+  RtcpCommonHeader header;
+  EXPECT_TRUE(RtcpParseCommonHeader(kPacket, kPacketLength, &header));
+  header.payload_size_bytes--;
+
+  Pli parsed;
+  EXPECT_FALSE(
+      parsed.Parse(header, kPacket + RtcpCommonHeader::kHeaderSizeBytes));
+}
+
+}  // namespace
+}  // namespace webrtc