Add a ParseHeader method to RtcpPacket, for parsing common RTCP header.

webrtc/modules/rtp_rtcp/source/rtcp_packet_unittest.cc

 /*
  *  Copyright (c) 2014 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.
  *
  * This file includes unit tests for the RtcpPacket.
  */
 
 #include "testing/gmock/include/gmock/gmock.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
+#include "webrtc/base/checks.h"
+#include "webrtc/modules/rtp_rtcp/source/byte_io.h"
 #include "webrtc/modules/rtp_rtcp/source/rtcp_packet.h"
 #include "webrtc/test/rtcp_packet_parser.h"
 
 using ::testing::ElementsAre;
 
 using webrtc::rtcp::App;
 using webrtc::rtcp::Bye;
 using webrtc::rtcp::Dlrr;
 using webrtc::rtcp::Empty;
 using webrtc::rtcp::Fir;
@@ skipping 10 matching lines @@
 using webrtc::rtcp::Rpsi;
 using webrtc::rtcp::Rrtr;
 using webrtc::rtcp::SenderReport;
 using webrtc::rtcp::Tmmbn;
 using webrtc::rtcp::Tmmbr;
 using webrtc::rtcp::VoipMetric;
 using webrtc::rtcp::Xr;
 using webrtc::test::RtcpPacketParser;
 
 namespace webrtc {
+namespace rtcp {
 
 const uint32_t kSenderSsrc = 0x12345678;
 const uint32_t kRemoteSsrc = 0x23456789;
 
+// Override RtcpPacket so we can test protected methods.
+class RtcpPacketHeaderTest : public ::testing::Test,
+                             protected RtcpPacket {
+ public:
+  RtcpPacketHeaderTest() {
+    memset(buffer, 0, kBufferCapacity);
+  }
+
+  virtual ~RtcpPacketHeaderTest() {}
+
+  bool Create(uint8_t* packet,
+              size_t* index,
+              size_t max_length,
+              PacketReadyCallback* callback) const override {
+    RTC_NOTREACHED();
+    return false;
+  }
+
+  size_t BlockLength() const { return 0; }
+
+ protected:
+  static const size_t kHeaderSize = 4;
+  static const size_t kBufferCapacity = 40;
+  uint8_t buffer[kBufferCapacity];
+  RtcpPacket::CommonHeader header;
+};
+
+TEST_F(RtcpPacketHeaderTest, HeaderSize) {
+  // Buffer needs to be able to hold the header.
+  for (size_t i = 0; i < kHeaderSize; ++i)
+    EXPECT_FALSE(ParseHeader(buffer, 0, i, &header));
+}
+
+TEST_F(RtcpPacketHeaderTest, Version) {
+  // Version 2 is the only allowed for now.
+  for (int v = 0; v < 4; ++v) {
+    buffer[0] = v << 6;
+    EXPECT_EQ(v == 2, ParseHeader(buffer, 0, kHeaderSize, &header));
+  }
+}
+
+TEST_F(RtcpPacketHeaderTest, PacketSize) {
+  // Set v = 2, leave p, fmt, pt as 0.
+  buffer[0] = 2 << 6;
+
+  const size_t kBlockSize = 3;
+  ByteWriter<uint16_t>::WriteBigEndian(&buffer[2], kBlockSize);
+  const size_t kSizeInBytes = (kBlockSize + 1) * 4;
+
+  EXPECT_FALSE(ParseHeader(buffer, 0, kSizeInBytes - 1, &header));
+  EXPECT_TRUE(ParseHeader(buffer, 0, kSizeInBytes, &header));
+}
+
+TEST_F(RtcpPacketHeaderTest, PayloadSize) {
+  // Set v = 2, p = 1, but leave fmt, pt as 0.
+  buffer[0] = (2 << 6) | (1 << 5);
+
+  const size_t kBlockSize = 3;
+  ByteWriter<uint16_t>::WriteBigEndian(&buffer[2], kBlockSize);
+  const size_t kSizeInBytes = (kBlockSize + 1) * 4;
+  const size_t kPayloadSize = kSizeInBytes - kHeaderSize;
+
+  // Padding one byte larger than possible.
+  buffer[kSizeInBytes - 1] = kPayloadSize + 1;
+  EXPECT_FALSE(ParseHeader(buffer, 0, kSizeInBytes, &header));
+
+  // Pure padding packet?
+  buffer[kSizeInBytes - 1] = kPayloadSize;
+  EXPECT_TRUE(ParseHeader(buffer, 0, kSizeInBytes, &header));
+  EXPECT_EQ(0u, header.payload_size_bytes);
+
+  // Single byte of actual data.
+  buffer[kSizeInBytes - 1] = kPayloadSize - 1;
+  EXPECT_TRUE(ParseHeader(buffer, 0, kSizeInBytes, &header));
+  EXPECT_EQ(1u, header.payload_size_bytes);
+
+}
+
+TEST_F(RtcpPacketHeaderTest, FormatAndPayloadType) {
+
+}
+
 TEST(RtcpPacketTest, Rr) {
   ReceiverReport rr;
   rr.From(kSenderSsrc);
 
   rtc::scoped_ptr<RawPacket> packet(rr.Build());
   RtcpPacketParser parser;
   parser.Parse(packet->Buffer(), packet->Length());
   EXPECT_EQ(1, parser.receiver_report()->num_packets());
   EXPECT_EQ(kSenderSsrc, parser.receiver_report()->Ssrc());
   EXPECT_EQ(0, parser.report_block()->num_packets());
@@ skipping 1018 matching lines @@
   for (int i = 0; i < kMaxBlocks; ++i)
     EXPECT_TRUE(xr.WithDlrr(&dlrr));
   EXPECT_FALSE(xr.WithDlrr(&dlrr));
 
   VoipMetric voip_metric;
   for (int i = 0; i < kMaxBlocks; ++i)
     EXPECT_TRUE(xr.WithVoipMetric(&voip_metric));
   EXPECT_FALSE(xr.WithVoipMetric(&voip_metric));
 }
 
+}  // namespace rtcp
 }  // namespace webrtc