text: /*
   * libjingle
   * Copyright 2011 Google Inc.
   *
   * Redistribution and use in source and binary forms, with or without
   * modification, are permitted provided that the following conditions are met:
   *
   *  1. Redistributions of source code must retain the above copyright notice,
   *     this list of conditions and the following disclaimer.
   *  2. Redistributions in binary form must reproduce the above copyright notice,
   *     this list of conditions and the following disclaimer in the documentation
   *     and/or other materials provided with the distribution.
   *  3. The name of the author may not be used to endorse or promote products
   *     derived from this software without specific prior written permission.
   *
   * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
   * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
   * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
   * EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
   * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
   * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
   * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
   * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
   * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
   * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   */
  
  #include "talk/session/media/rtcpmuxfilter.h"
  
  #include "talk/media/base/testutils.h"
  #include "webrtc/base/gunit.h"
  
  TEST(RtcpMuxFilterTest, DemuxRtcpSender) {
    cricket::RtcpMuxFilter filter;
    const char data[] = { 0, 73, 0, 0 };
    const int len = 4;
  
    // Init state - refuse to demux
    EXPECT_FALSE(filter.DemuxRtcp(data, len));
    // After sent offer, demux should be enabled
    filter.SetOffer(true, cricket::CS_LOCAL);
    EXPECT_TRUE(filter.DemuxRtcp(data, len));
    // Remote accepted, demux should be enabled
    filter.SetAnswer(true, cricket::CS_REMOTE);
    EXPECT_TRUE(filter.DemuxRtcp(data, len));
  }
  
  TEST(RtcpMuxFilterTest, DemuxRtcpReceiver) {
    cricket::RtcpMuxFilter filter;
    const char data[] = { 0, 73, 0, 0 };
    const int len = 4;
  
    // Init state - refuse to demux
    EXPECT_FALSE(filter.DemuxRtcp(data, len));
    // After received offer, demux should not be enabled
    filter.SetOffer(true, cricket::CS_REMOTE);
    EXPECT_FALSE(filter.DemuxRtcp(data, len));
    // We accept, demux is now enabled
    filter.SetAnswer(true, cricket::CS_LOCAL);
    EXPECT_TRUE(filter.DemuxRtcp(data, len));
  }
  
  TEST(RtcpMuxFilterTest, DemuxRtcpSenderProvisionalAnswer) {
    cricket::RtcpMuxFilter filter;
    const char data[] = { 0, 73, 0, 0 };
    const int len = 4;
  
    filter.SetOffer(true, cricket::CS_REMOTE);
    // Received provisional answer without mux enabled.
    filter.SetProvisionalAnswer(false, cricket::CS_LOCAL);
    EXPECT_FALSE(filter.DemuxRtcp(data, len));
    // Received provisional answer with mux enabled.
    filter.SetProvisionalAnswer(true, cricket::CS_LOCAL);
    EXPECT_TRUE(filter.DemuxRtcp(data, len));
    // Remote accepted, demux should be enabled.
    filter.SetAnswer(true, cricket::CS_LOCAL);
    EXPECT_TRUE(filter.DemuxRtcp(data, len));
  }
  
  TEST(RtcpMuxFilterTest, DemuxRtcpReceiverProvisionalAnswer) {
    cricket::RtcpMuxFilter filter;
    const char data[] = { 0, 73, 0, 0 };
    const int len = 4;
  
    filter.SetOffer(true, cricket::CS_LOCAL);
    // Received provisional answer without mux enabled.
    filter.SetProvisionalAnswer(false, cricket::CS_REMOTE);
    // After sent offer, demux should be enabled until we have received a
    // final answer.
    EXPECT_TRUE(filter.DemuxRtcp(data, len));
    // Received provisional answer with mux enabled.
    filter.SetProvisionalAnswer(true, cricket::CS_REMOTE);
    EXPECT_TRUE(filter.DemuxRtcp(data, len));
    // Remote accepted, demux should be enabled.
    filter.SetAnswer(true, cricket::CS_REMOTE);
    EXPECT_TRUE(filter.DemuxRtcp(data, len));
  }
  
  TEST(RtcpMuxFilterTest, IsActiveSender) {
    cricket::RtcpMuxFilter filter;
    // Init state - not active
    EXPECT_FALSE(filter.IsActive());
    // After sent offer, demux should not be active.
    filter.SetOffer(true, cricket::CS_LOCAL);
    EXPECT_FALSE(filter.IsActive());
    // Remote accepted, filter is now active.
    filter.SetAnswer(true, cricket::CS_REMOTE);
    EXPECT_TRUE(filter.IsActive());
  }
  
  // Test that we can receive provisional answer and final answer.
  TEST(RtcpMuxFilterTest, ReceivePrAnswer) {
    cricket::RtcpMuxFilter filter;
    filter.SetOffer(true, cricket::CS_LOCAL);
    // Received provisional answer with mux enabled.
    EXPECT_TRUE(filter.SetProvisionalAnswer(true, cricket::CS_REMOTE));
    // We are now active since both sender and receiver support mux.
    EXPECT_TRUE(filter.IsActive());
    // Received provisional answer with mux disabled.
    EXPECT_TRUE(filter.SetProvisionalAnswer(false, cricket::CS_REMOTE));
    // We are now inactive since the receiver doesn't support mux.
    EXPECT_FALSE(filter.IsActive());
    // Received final answer with mux enabled.
    EXPECT_TRUE(filter.SetAnswer(true, cricket::CS_REMOTE));
    EXPECT_TRUE(filter.IsActive());
  }
  
  TEST(RtcpMuxFilterTest, IsActiveReceiver) {
    cricket::RtcpMuxFilter filter;
    // Init state - not active.
    EXPECT_FALSE(filter.IsActive());
    // After received offer, demux should not be active
    filter.SetOffer(true, cricket::CS_REMOTE);
    EXPECT_FALSE(filter.IsActive());
    // We accept, filter is now active
    filter.SetAnswer(true, cricket::CS_LOCAL);
    EXPECT_TRUE(filter.IsActive());
  }
  
  // Test that we can send provisional answer and final answer.
  TEST(RtcpMuxFilterTest, SendPrAnswer) {
    cricket::RtcpMuxFilter filter;
    filter.SetOffer(true, cricket::CS_REMOTE);
    // Send provisional answer with mux enabled.
    EXPECT_TRUE(filter.SetProvisionalAnswer(true, cricket::CS_LOCAL));
    EXPECT_TRUE(filter.IsActive());
    // Received provisional answer with mux disabled.
    EXPECT_TRUE(filter.SetProvisionalAnswer(false, cricket::CS_LOCAL));
    EXPECT_FALSE(filter.IsActive());
    // Send final answer with mux enabled.
    EXPECT_TRUE(filter.SetAnswer(true, cricket::CS_LOCAL));
    EXPECT_TRUE(filter.IsActive());
  }
  
  // Test that we can enable the filter in an update.
  // We can not disable the filter later since that would mean we need to
  // recreate a rtcp transport channel.
  TEST(RtcpMuxFilterTest, EnableFilterDuringUpdate) {
    cricket::RtcpMuxFilter filter;
    EXPECT_FALSE(filter.IsActive());
    EXPECT_TRUE(filter.SetOffer(false, cricket::CS_REMOTE));
    EXPECT_TRUE(filter.SetAnswer(false, cricket::CS_LOCAL));
    EXPECT_FALSE(filter.IsActive());
  
    EXPECT_TRUE(filter.SetOffer(true, cricket::CS_REMOTE));
    EXPECT_TRUE(filter.SetAnswer(true, cricket::CS_LOCAL));
    EXPECT_TRUE(filter.IsActive());
  
    EXPECT_FALSE(filter.SetOffer(false, cricket::CS_REMOTE));
    EXPECT_FALSE(filter.SetAnswer(false, cricket::CS_LOCAL));
    EXPECT_TRUE(filter.IsActive());
  }
  
  // Test that SetOffer can be called twice.
  TEST(RtcpMuxFilterTest, SetOfferTwice) {
    cricket::RtcpMuxFilter filter;
  
    EXPECT_TRUE(filter.SetOffer(true, cricket::CS_REMOTE));
    EXPECT_TRUE(filter.SetOffer(true, cricket::CS_REMOTE));
    EXPECT_TRUE(filter.SetAnswer(true, cricket::CS_LOCAL));
    EXPECT_TRUE(filter.IsActive());
  
    cricket::RtcpMuxFilter filter2;
    EXPECT_TRUE(filter2.SetOffer(false, cricket::CS_LOCAL));
    EXPECT_TRUE(filter2.SetOffer(false, cricket::CS_LOCAL));
    EXPECT_TRUE(filter2.SetAnswer(false, cricket::CS_REMOTE));
    EXPECT_FALSE(filter2.IsActive());
  }
  
  // Test that the filter can be enabled twice.
  TEST(RtcpMuxFilterTest, EnableFilterTwiceDuringUpdate) {
    cricket::RtcpMuxFilter filter;
  
    EXPECT_TRUE(filter.SetOffer(true, cricket::CS_REMOTE));
    EXPECT_TRUE(filter.SetAnswer(true, cricket::CS_LOCAL));
    EXPECT_TRUE(filter.IsActive());
  
    EXPECT_TRUE(filter.SetOffer(true, cricket::CS_REMOTE));
    EXPECT_TRUE(filter.SetAnswer(true, cricket::CS_LOCAL));
    EXPECT_TRUE(filter.IsActive());
  }
  
  // Test that the filter can be kept disabled during updates.
  TEST(RtcpMuxFilterTest, KeepFilterDisabledDuringUpdate) {
    cricket::RtcpMuxFilter filter;
  
    EXPECT_TRUE(filter.SetOffer(false, cricket::CS_REMOTE));
    EXPECT_TRUE(filter.SetAnswer(false, cricket::CS_LOCAL));
    EXPECT_FALSE(filter.IsActive());
  
    EXPECT_TRUE(filter.SetOffer(false, cricket::CS_REMOTE));
    EXPECT_TRUE(filter.SetAnswer(false, cricket::CS_LOCAL));
    EXPECT_FALSE(filter.IsActive());
  }
  
  // Test that we can SetActive and then can't deactivate.
  TEST(RtcpMuxFilterTest, SetActiveCantDeactivate) {
    cricket::RtcpMuxFilter filter;
    const char data[] = { 0, 73, 0, 0 };
    const int len = 4;
  
    filter.SetActive();
    EXPECT_TRUE(filter.IsActive());
    EXPECT_TRUE(filter.DemuxRtcp(data, len));
  
    EXPECT_FALSE(filter.SetOffer(false, cricket::CS_LOCAL));
    EXPECT_TRUE(filter.IsActive());
    EXPECT_TRUE(filter.SetOffer(true, cricket::CS_LOCAL));
    EXPECT_TRUE(filter.IsActive());
  
    EXPECT_FALSE(filter.SetProvisionalAnswer(false, cricket::CS_REMOTE));
    EXPECT_TRUE(filter.IsActive());
    EXPECT_TRUE(filter.SetProvisionalAnswer(true, cricket::CS_REMOTE));
    EXPECT_TRUE(filter.IsActive());
  
    EXPECT_FALSE(filter.SetAnswer(false, cricket::CS_REMOTE));
    EXPECT_TRUE(filter.IsActive());
    EXPECT_TRUE(filter.SetAnswer(true, cricket::CS_REMOTE));
    EXPECT_TRUE(filter.IsActive());
  
    EXPECT_FALSE(filter.SetOffer(false, cricket::CS_REMOTE));
    EXPECT_TRUE(filter.IsActive());
    EXPECT_TRUE(filter.SetOffer(true, cricket::CS_REMOTE));
    EXPECT_TRUE(filter.IsActive());
  
    EXPECT_FALSE(filter.SetProvisionalAnswer(false, cricket::CS_LOCAL));
    EXPECT_TRUE(filter.IsActive());
    EXPECT_TRUE(filter.SetProvisionalAnswer(true, cricket::CS_LOCAL));
    EXPECT_TRUE(filter.IsActive());
  
    EXPECT_FALSE(filter.SetAnswer(false, cricket::CS_LOCAL));
    EXPECT_TRUE(filter.IsActive());
    EXPECT_TRUE(filter.SetAnswer(true, cricket::CS_LOCAL));
    EXPECT_TRUE(filter.IsActive());
  }
  