Add header extension filtering for WebRtcVoiceEngine/MediaChannel.

talk/media/webrtc/webrtcmediaengine_unittest.cc

Index: talk/media/webrtc/webrtcmediaengine_unittest.cc
diff --git a/talk/media/webrtc/webrtcmediaengine_unittest.cc b/talk/media/webrtc/webrtcmediaengine_unittest.cc
new file mode 100644
index 0000000000000000000000000000000000000000..7c80e773015e27587ad76d194776d3d84af9148d
--- /dev/null
+++ b/talk/media/webrtc/webrtcmediaengine_unittest.cc
@@ -0,0 +1,205 @@
+/*
+ * libjingle
+ * Copyright 2015 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 "testing/gtest/include/gtest/gtest.h"
+
+#include "talk/media/webrtc/webrtcmediaengine.h"
+
+namespace cricket {
+namespace {
+
+std::vector<RtpHeaderExtension> MakeUniqueExtensions() {
+  std::vector<RtpHeaderExtension> result;
+  char name[] = "a";
+  for (int i = 0; i < 7; ++i) {
+    result.push_back(RtpHeaderExtension(name, 1 + i));
+    name[0]++;
+    result.push_back(RtpHeaderExtension(name, 14 - i));
+    name[0]++;
+  }
+  return result;
+}
+
+std::vector<RtpHeaderExtension> MakeRedundantExtensions() {
+  std::vector<RtpHeaderExtension> result;
+  char name[] = "a";
+  for (int i = 0; i < 7; ++i) {
+    result.push_back(RtpHeaderExtension(name, 1 + i));
+    result.push_back(RtpHeaderExtension(name, 14 - i));
+    name[0]++;
+  }
+  return result;
+}
+
+bool SupportedExtensions1(const std::string& name) {
+  return name == "c" || name == "i";
+}
+
+bool SupportedExtensions2(const std::string& name) {
+  return name != "a" && name != "n";
+}
+
+bool IsSorted(const std::vector<webrtc::RtpExtension>& extensions) {
+  const std::string* last = nullptr;
+  for (const auto& extension : extensions) {
+    if (last && *last > extension.name) {
+      return false;
+    }
+    last = &extension.name;
+  }
+  return true;
+}
+}  // namespace
+
+TEST(WebRtcMediaEngineTest, ValidateRtpExtensions_EmptyList) {
+  std::vector<RtpHeaderExtension> extensions;
+  EXPECT_TRUE(ValidateRtpExtensions(extensions));
+}
+
+TEST(WebRtcMediaEngineTest, ValidateRtpExtensions_AllGood) {
+  std::vector<RtpHeaderExtension> extensions = MakeUniqueExtensions();
+  EXPECT_TRUE(ValidateRtpExtensions(extensions));
+}
+
+TEST(WebRtcMediaEngineTest, ValidateRtpExtensions_OutOfRangeId_Low) {
+  std::vector<RtpHeaderExtension> extensions = MakeUniqueExtensions();
+  extensions.push_back(RtpHeaderExtension("foo", 0));
+  EXPECT_FALSE(ValidateRtpExtensions(extensions));
+}
+
+TEST(WebRtcMediaEngineTest, ValidateRtpExtensions_OutOfRangeId_High) {
+  std::vector<RtpHeaderExtension> extensions = MakeUniqueExtensions();
+  extensions.push_back(RtpHeaderExtension("foo", 15));
+  EXPECT_FALSE(ValidateRtpExtensions(extensions));
+}
+
+TEST(WebRtcMediaEngineTest, ValidateRtpExtensions_OverlappingIds_StartOfSet) {
+  std::vector<RtpHeaderExtension> extensions = MakeUniqueExtensions();
+  extensions.push_back(RtpHeaderExtension("foo", 1));
+  EXPECT_FALSE(ValidateRtpExtensions(extensions));
+}
+
+TEST(WebRtcMediaEngineTest, ValidateRtpExtensions_OverlappingIds_EndOfSet) {
+  std::vector<RtpHeaderExtension> extensions = MakeUniqueExtensions();
+  extensions.push_back(RtpHeaderExtension("foo", 14));
+  EXPECT_FALSE(ValidateRtpExtensions(extensions));
+}
+
+TEST(WebRtcMediaEngineTest, FilterRtpExtensions_EmptyList) {
+  std::vector<RtpHeaderExtension> extensions;
+  std::vector<webrtc::RtpExtension> filtered =
+      FilterRtpExtensions(extensions, SupportedExtensions1, true);
+  EXPECT_EQ(0, filtered.size());
+}
+
+TEST(WebRtcMediaEngineTest, FilterRtpExtensions_IncludeOnlySupported) {
+  std::vector<RtpHeaderExtension> extensions = MakeUniqueExtensions();
+  std::vector<webrtc::RtpExtension> filtered =
+      FilterRtpExtensions(extensions, SupportedExtensions1, false);
+  EXPECT_EQ(2, filtered.size());
+  EXPECT_EQ("c", filtered[0].name);
+  EXPECT_EQ("i", filtered[1].name);
+}
+
+TEST(WebRtcMediaEngineTest, FilterRtpExtensions_SortedByName_1) {
+  std::vector<RtpHeaderExtension> extensions = MakeUniqueExtensions();
+  std::vector<webrtc::RtpExtension> filtered =
+      FilterRtpExtensions(extensions, SupportedExtensions2, false);
+  EXPECT_EQ(12, filtered.size());
+  EXPECT_TRUE(IsSorted(filtered));
+}
+
+TEST(WebRtcMediaEngineTest, FilterRtpExtensions_SortedByName_2) {
+  std::vector<RtpHeaderExtension> extensions = MakeUniqueExtensions();
+  std::vector<webrtc::RtpExtension> filtered =
+      FilterRtpExtensions(extensions, SupportedExtensions2, true);
+  EXPECT_EQ(12, filtered.size());
+  EXPECT_TRUE(IsSorted(filtered));
+}
+
+TEST(WebRtcMediaEngineTest, FilterRtpExtensions_DontRemoveRedundant) {
+  std::vector<RtpHeaderExtension> extensions = MakeRedundantExtensions();
+  std::vector<webrtc::RtpExtension> filtered =
+      FilterRtpExtensions(extensions, SupportedExtensions2, false);
+  EXPECT_EQ(12, filtered.size());
+  EXPECT_TRUE(IsSorted(filtered));
+  EXPECT_EQ(filtered[0].name, filtered[1].name);
+}
+
+TEST(WebRtcMediaEngineTest, FilterRtpExtensions_RemoveRedundant) {
+  std::vector<RtpHeaderExtension> extensions = MakeRedundantExtensions();
+  std::vector<webrtc::RtpExtension> filtered =
+      FilterRtpExtensions(extensions, SupportedExtensions2, true);
+  EXPECT_EQ(6, filtered.size());
+  EXPECT_TRUE(IsSorted(filtered));
+  EXPECT_NE(filtered[0].name, filtered[1].name);
+}
+
+TEST(WebRtcMediaEngineTest, FilterRtpExtensions_RemoveRedundantBwe_1) {
+  std::vector<RtpHeaderExtension> extensions;
+  extensions.push_back(
+      RtpHeaderExtension(kRtpTransportSequenceNumberHeaderExtension, 3));
+  extensions.push_back(
+      RtpHeaderExtension(kRtpTimestampOffsetHeaderExtension, 9));
+  extensions.push_back(
+      RtpHeaderExtension(kRtpAbsoluteSenderTimeHeaderExtension, 6));
+  extensions.push_back(
+      RtpHeaderExtension(kRtpTransportSequenceNumberHeaderExtension, 1));
+  extensions.push_back(
+      RtpHeaderExtension(kRtpTimestampOffsetHeaderExtension, 14));
+  std::vector<webrtc::RtpExtension> filtered =
+      FilterRtpExtensions(extensions, SupportedExtensions2, true);
+  EXPECT_EQ(1, filtered.size());
+  EXPECT_EQ(kRtpTransportSequenceNumberHeaderExtension, filtered[0].name);
+}
+
+TEST(WebRtcMediaEngineTest, FilterRtpExtensions_RemoveRedundantBwe_2) {
+  std::vector<RtpHeaderExtension> extensions;
+  extensions.push_back(
+      RtpHeaderExtension(kRtpTimestampOffsetHeaderExtension, 1));
+  extensions.push_back(
+      RtpHeaderExtension(kRtpAbsoluteSenderTimeHeaderExtension, 14));
+  extensions.push_back(
+      RtpHeaderExtension(kRtpTimestampOffsetHeaderExtension, 7));
+  std::vector<webrtc::RtpExtension> filtered =
+      FilterRtpExtensions(extensions, SupportedExtensions2, true);
+  EXPECT_EQ(1, filtered.size());
+  EXPECT_EQ(kRtpAbsoluteSenderTimeHeaderExtension, filtered[0].name);
+}
+
+TEST(WebRtcMediaEngineTest, FilterRtpExtensions_RemoveRedundantBwe_3) {
+  std::vector<RtpHeaderExtension> extensions;
+  extensions.push_back(
+      RtpHeaderExtension(kRtpTimestampOffsetHeaderExtension, 2));
+  extensions.push_back(
+      RtpHeaderExtension(kRtpTimestampOffsetHeaderExtension, 14));
+  std::vector<webrtc::RtpExtension> filtered =
+      FilterRtpExtensions(extensions, SupportedExtensions2, true);
+  EXPECT_EQ(1, filtered.size());
+  EXPECT_EQ(kRtpTimestampOffsetHeaderExtension, filtered[0].name);
+}
+}  // namespace cricket