Adding "adapter" ORTC objects on top of ChannelManager/BaseChannel/etc.

webrtc/ortc/rtpparametersconversion_unittest.cc

Index: webrtc/ortc/rtpparametersconversion_unittest.cc
diff --git a/webrtc/ortc/rtpparametersconversion_unittest.cc b/webrtc/ortc/rtpparametersconversion_unittest.cc
new file mode 100644
index 0000000000000000000000000000000000000000..932d8a91ca62988c495ce5f1f8f9e84a2a1600d0
--- /dev/null
+++ b/webrtc/ortc/rtpparametersconversion_unittest.cc
@@ -0,0 +1,535 @@
+/*
+ *  Copyright 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 <algorithm>
+
+#include "webrtc/base/gunit.h"
+#include "webrtc/ortc/rtpparametersconversion.h"
+#include "webrtc/ortc/testrtpparameters.h"
+
+namespace webrtc {
+
+TEST(RtpParametersConversionTest, ToFeedbackParam) {
+  auto result =
+      ToFeedbackParam({RtcpFeedbackType::CCM, RtcpFeedbackMessageType::FIR});
+  EXPECT_EQ(cricket::FeedbackParam("ccm", "fir"), result.value());
+  result = ToFeedbackParam(
+      {RtcpFeedbackType::NACK, RtcpFeedbackMessageType::GENERIC_NACK});
+  EXPECT_EQ(cricket::FeedbackParam("nack"), result.value());
+  result =
+      ToFeedbackParam({RtcpFeedbackType::NACK, RtcpFeedbackMessageType::PLI});
+  EXPECT_EQ(cricket::FeedbackParam("nack", "pli"), result.value());
+  result = ToFeedbackParam(RtcpFeedback(RtcpFeedbackType::REMB));
+  EXPECT_EQ(cricket::FeedbackParam("goog-remb"), result.value());
+  result = ToFeedbackParam(RtcpFeedback(RtcpFeedbackType::TRANSPORT_CC));
+  EXPECT_EQ(cricket::FeedbackParam("transport-cc"), result.value());
+}
+
+TEST(RtpParametersConversionTest, ToFeedbackParamErrors) {
+  // CCM with missing or invalid message type.
+  auto result = ToFeedbackParam(RtcpFeedback(RtcpFeedbackType::CCM));
+  EXPECT_EQ(RTCErrorType::INVALID_PARAMETER, result.error().type());
+  result =
+      ToFeedbackParam({RtcpFeedbackType::CCM, RtcpFeedbackMessageType::PLI});
+  EXPECT_EQ(RTCErrorType::INVALID_PARAMETER, result.error().type());
+  // NACK with missing or invalid message type.
+  result = ToFeedbackParam(RtcpFeedback(RtcpFeedbackType::NACK));
+  EXPECT_EQ(RTCErrorType::INVALID_PARAMETER, result.error().type());
+  result =
+      ToFeedbackParam({RtcpFeedbackType::NACK, RtcpFeedbackMessageType::FIR});
+  EXPECT_EQ(RTCErrorType::INVALID_PARAMETER, result.error().type());
+  // REMB with message type (should be left empty).
+  result = ToFeedbackParam(
+      {RtcpFeedbackType::REMB, RtcpFeedbackMessageType::GENERIC_NACK});
+  EXPECT_EQ(RTCErrorType::INVALID_PARAMETER, result.error().type());
+  // TRANSPORT_CC with message type (should be left empty).
+  result = ToFeedbackParam(
+      {RtcpFeedbackType::TRANSPORT_CC, RtcpFeedbackMessageType::FIR});
+  EXPECT_EQ(RTCErrorType::INVALID_PARAMETER, result.error().type());
+}
+
+TEST(RtpParametersConversionTest, ToAudioCodec) {
+  RtpCodecParameters codec;
+  codec.name = "AuDiO";
+  codec.kind = cricket::MEDIA_TYPE_AUDIO;
+  codec.payload_type = 120;
+  codec.clock_rate.emplace(36000);
+  codec.num_channels.emplace(6);
+  codec.parameters["foo"] = "bar";
+  codec.rtcp_feedback.emplace_back(RtcpFeedbackType::TRANSPORT_CC);
+  auto result = ToCricketCodec<cricket::AudioCodec>(codec);
+  ASSERT_TRUE(result.ok());
+
+  EXPECT_EQ("AuDiO", result.value().name);
+  EXPECT_EQ(120, result.value().id);
+  EXPECT_EQ(36000, result.value().clockrate);
+  EXPECT_EQ(6u, result.value().channels);
+  ASSERT_EQ(1u, result.value().params.size());
+  EXPECT_EQ("bar", result.value().params["foo"]);
+  EXPECT_EQ(1u, result.value().feedback_params.params().size());
+  EXPECT_TRUE(result.value().feedback_params.Has(
+      cricket::FeedbackParam("transport-cc")));
+}
+
+TEST(RtpParametersConversionTest, ToVideoCodec) {
+  RtpCodecParameters codec;
+  codec.name = "coolcodec";
+  codec.kind = cricket::MEDIA_TYPE_VIDEO;
+  codec.payload_type = 101;
+  codec.clock_rate.emplace(90000);
+  codec.parameters["foo"] = "bar";
+  codec.parameters["PING"] = "PONG";
+  codec.rtcp_feedback.emplace_back(RtcpFeedbackType::TRANSPORT_CC);
+  codec.rtcp_feedback.emplace_back(RtcpFeedbackType::NACK,
+                                   RtcpFeedbackMessageType::PLI);
+  auto result = ToCricketCodec<cricket::VideoCodec>(codec);
+  ASSERT_TRUE(result.ok());
+
+  EXPECT_EQ("coolcodec", result.value().name);
+  EXPECT_EQ(101, result.value().id);
+  EXPECT_EQ(90000, result.value().clockrate);
+  ASSERT_EQ(2u, result.value().params.size());
+  EXPECT_EQ("bar", result.value().params["foo"]);
+  EXPECT_EQ("PONG", result.value().params["PING"]);
+  EXPECT_EQ(2u, result.value().feedback_params.params().size());
+  EXPECT_TRUE(result.value().feedback_params.Has(
+      cricket::FeedbackParam("transport-cc")));
+  EXPECT_TRUE(result.value().feedback_params.Has(
+      cricket::FeedbackParam("nack", "pli")));
+}
+
+// Trying to convert to an AudioCodec if the kind is "video" should fail.
+TEST(RtpParametersConversionTest, ToCricketCodecInvalidKind) {
+  RtpCodecParameters audio_codec;
+  audio_codec.name = "opus";
+  audio_codec.kind = cricket::MEDIA_TYPE_VIDEO;
+  audio_codec.payload_type = 111;
+  audio_codec.clock_rate.emplace(48000);
+  audio_codec.num_channels.emplace(2);
+
+  RtpCodecParameters video_codec;
+  video_codec.name = "VP8";
+  video_codec.kind = cricket::MEDIA_TYPE_AUDIO;
+  video_codec.payload_type = 102;
+  video_codec.clock_rate.emplace(90000);
+
+  auto audio_result = ToCricketCodec<cricket::AudioCodec>(audio_codec);
+  EXPECT_EQ(RTCErrorType::INVALID_PARAMETER, audio_result.error().type());
+
+  auto video_result = ToCricketCodec<cricket::VideoCodec>(video_codec);
+  EXPECT_EQ(RTCErrorType::INVALID_PARAMETER, video_result.error().type());
+
+  // Sanity check that if the kind is correct, the conversion succeeds.
+  audio_codec.kind = cricket::MEDIA_TYPE_AUDIO;
+  video_codec.kind = cricket::MEDIA_TYPE_VIDEO;
+  audio_result = ToCricketCodec<cricket::AudioCodec>(audio_codec);
+  EXPECT_TRUE(audio_result.ok());
+  video_result = ToCricketCodec<cricket::VideoCodec>(video_codec);
+  EXPECT_TRUE(video_result.ok());
+}
+
+TEST(RtpParametersConversionTest, ToAudioCodecInvalidParameters) {
+  // Missing channels.
+  RtpCodecParameters codec;
+  codec.name = "opus";
+  codec.kind = cricket::MEDIA_TYPE_AUDIO;
+  codec.payload_type = 111;
+  codec.clock_rate.emplace(48000);
+  auto result = ToCricketCodec<cricket::AudioCodec>(codec);
+  EXPECT_EQ(RTCErrorType::INVALID_PARAMETER, result.error().type());
+
+  // Negative number of channels.
+  codec.num_channels.emplace(-1);
+  result = ToCricketCodec<cricket::AudioCodec>(codec);
+  EXPECT_EQ(RTCErrorType::INVALID_RANGE, result.error().type());
+
+  // Missing clock rate.
+  codec.num_channels.emplace(2);
+  codec.clock_rate.reset();
+  result = ToCricketCodec<cricket::AudioCodec>(codec);
+  EXPECT_EQ(RTCErrorType::INVALID_PARAMETER, result.error().type());
+
+  // Negative clock rate.
+  codec.clock_rate.emplace(-48000);
+  result = ToCricketCodec<cricket::AudioCodec>(codec);
+  EXPECT_EQ(RTCErrorType::INVALID_RANGE, result.error().type());
+
+  // Sanity check that conversion succeeds if these errors are fixed.
+  codec.clock_rate.emplace(48000);
+  result = ToCricketCodec<cricket::AudioCodec>(codec);
+  EXPECT_TRUE(result.ok());
+}
+
+TEST(RtpParametersConversionTest, ToVideoCodecInvalidParameters) {
+  // Missing clock rate.
+  RtpCodecParameters codec;
+  codec.name = "VP8";
+  codec.kind = cricket::MEDIA_TYPE_VIDEO;
+  codec.payload_type = 102;
+  auto result = ToCricketCodec<cricket::VideoCodec>(codec);
+  EXPECT_EQ(RTCErrorType::INVALID_PARAMETER, result.error().type());
+
+  // Invalid clock rate.
+  codec.clock_rate.emplace(48000);
+  result = ToCricketCodec<cricket::VideoCodec>(codec);
+  EXPECT_EQ(RTCErrorType::INVALID_PARAMETER, result.error().type());
+
+  // Channels set (should be unset).
+  codec.clock_rate.emplace(90000);
+  codec.num_channels.emplace(2);
+  result = ToCricketCodec<cricket::VideoCodec>(codec);
+  EXPECT_EQ(RTCErrorType::INVALID_PARAMETER, result.error().type());
+
+  // Sanity check that conversion succeeds if these errors are fixed.
+  codec.num_channels.reset();
+  result = ToCricketCodec<cricket::VideoCodec>(codec);
+  EXPECT_TRUE(result.ok());
+}
+
+TEST(RtpParametersConversionTest, ToCricketCodecInvalidPayloadType) {
+  RtpCodecParameters codec;
+  codec.name = "VP8";
+  codec.kind = cricket::MEDIA_TYPE_VIDEO;
+  codec.clock_rate.emplace(90000);
+
+  codec.payload_type = -1000;
+  auto result = ToCricketCodec<cricket::VideoCodec>(codec);
+  EXPECT_EQ(RTCErrorType::INVALID_RANGE, result.error().type());
+
+  // Max payload type is 127.
+  codec.payload_type = 128;
+  result = ToCricketCodec<cricket::VideoCodec>(codec);
+  EXPECT_EQ(RTCErrorType::INVALID_RANGE, result.error().type());
+
+  // Sanity check that conversion succeeds with a valid payload type.
+  codec.payload_type = 127;
+  result = ToCricketCodec<cricket::VideoCodec>(codec);
+  EXPECT_TRUE(result.ok());
+}
+
+// There are already tests for ToFeedbackParam, but ensure that those errors
+// are propogated from ToCricketCodec.
+TEST(RtpParametersConversionTest, ToCricketCodecInvalidRtcpFeedback) {
+  RtpCodecParameters codec;
+  codec.name = "VP8";
+  codec.kind = cricket::MEDIA_TYPE_VIDEO;
+  codec.clock_rate.emplace(90000);
+  codec.payload_type = 99;
+  codec.rtcp_feedback.emplace_back(RtcpFeedbackType::CCM,
+                                   RtcpFeedbackMessageType::PLI);
+
+  auto result = ToCricketCodec<cricket::VideoCodec>(codec);
+  EXPECT_EQ(RTCErrorType::INVALID_PARAMETER, result.error().type());
+
+  // Sanity check that conversion succeeds without invalid feedback.
+  codec.rtcp_feedback.clear();
+  result = ToCricketCodec<cricket::VideoCodec>(codec);
+  EXPECT_TRUE(result.ok());
+}
+
+TEST(RtpParametersConversionTest, ToCricketCodecs) {
+  std::vector<RtpCodecParameters> codecs;
+  RtpCodecParameters codec;
+  codec.name = "VP8";
+  codec.kind = cricket::MEDIA_TYPE_VIDEO;
+  codec.clock_rate.emplace(90000);
+  codec.payload_type = 99;
+  codecs.push_back(codec);
+
+  codec.name = "VP9";
+  codec.payload_type = 100;
+  codecs.push_back(codec);
+
+  auto result = ToCricketCodecs<cricket::VideoCodec>(codecs);
+  ASSERT_TRUE(result.ok());
+  ASSERT_EQ(2u, result.value().size());
+  EXPECT_EQ("VP8", result.value()[0].name);
+  EXPECT_EQ(99, result.value()[0].id);
+  EXPECT_EQ("VP9", result.value()[1].name);
+  EXPECT_EQ(100, result.value()[1].id);
+}
+
+TEST(RtpParametersConversionTest, ToCricketCodecsDuplicatePayloadType) {
+  std::vector<RtpCodecParameters> codecs;
+  RtpCodecParameters codec;
+  codec.name = "VP8";
+  codec.kind = cricket::MEDIA_TYPE_VIDEO;
+  codec.clock_rate.emplace(90000);
+  codec.payload_type = 99;
+  codecs.push_back(codec);
+
+  codec.name = "VP9";
+  codec.payload_type = 99;
+  codecs.push_back(codec);
+
+  auto result = ToCricketCodecs<cricket::VideoCodec>(codecs);
+  EXPECT_EQ(RTCErrorType::INVALID_PARAMETER, result.error().type());
+
+  // Sanity check that this succeeds without the duplicate payload type.
+  codecs[1].payload_type = 120;
+  result = ToCricketCodecs<cricket::VideoCodec>(codecs);
+  EXPECT_TRUE(result.ok());
+}
+
+TEST(RtpParametersConversionTest, ToRtpHeaderExtensions) {
+  std::vector<RtpHeaderExtensionParameters> extensions = {
+      {"http://example.com", 1}, {"urn:foo:bar", 14}};
+  auto result = ToRtpHeaderExtensions(extensions);
+  ASSERT_TRUE(result.ok());
+  ASSERT_EQ(2u, result.value().size());
+  EXPECT_EQ("http://example.com", result.value()[0].uri);
+  EXPECT_EQ(1, result.value()[0].id);
+  EXPECT_EQ("urn:foo:bar", result.value()[1].uri);
+  EXPECT_EQ(14, result.value()[1].id);
+}
+
+TEST(RtpParametersConversionTest, ToRtpHeaderExtensionsErrors) {
+  // First, IDs outside the range 1-14.
+  std::vector<RtpHeaderExtensionParameters> extensions = {
+      {"http://example.com", 0}};
+  auto result = ToRtpHeaderExtensions(extensions);
+  EXPECT_EQ(RTCErrorType::INVALID_RANGE, result.error().type());
+
+  extensions[0].id = 15;
+  result = ToRtpHeaderExtensions(extensions);
+  EXPECT_EQ(RTCErrorType::INVALID_RANGE, result.error().type());
+
+  // Duplicate IDs.
+  extensions = {{"http://example.com", 1}, {"urn:foo:bar", 1}};
+  result = ToRtpHeaderExtensions(extensions);
+  EXPECT_EQ(RTCErrorType::INVALID_PARAMETER, result.error().type());
+}
+
+TEST(RtpParametersConversionTest, ToStreamParamsVecSimple) {
+  std::vector<RtpEncodingParameters> encodings;
+  RtpEncodingParameters encoding;
+  encoding.ssrc.emplace(0xbaadf00d);
+  encodings.push_back(encoding);
+  auto result = ToStreamParamsVec(encodings);
+  ASSERT_TRUE(result.ok());
+  ASSERT_EQ(1u, result.value().size());
+  EXPECT_EQ(1u, result.value()[0].ssrcs.size());
+  EXPECT_EQ(0xbaadf00d, result.value()[0].first_ssrc());
+}
+
+TEST(RtpParametersConversionTest, ToStreamParamsVecWithRtx) {
+  std::vector<RtpEncodingParameters> encodings;
+  RtpEncodingParameters encoding;
+  // Test a corner case SSRC of 0.
+  encoding.ssrc.emplace(0u);
+  encoding.rtx.emplace(0xdeadbeef);
+  encodings.push_back(encoding);
+  auto result = ToStreamParamsVec(encodings);
+  ASSERT_TRUE(result.ok());
+  ASSERT_EQ(1u, result.value().size());
+  EXPECT_EQ(2u, result.value()[0].ssrcs.size());
+  EXPECT_EQ(0u, result.value()[0].first_ssrc());
+  uint32_t rtx_ssrc = 0;
+  EXPECT_TRUE(result.value()[0].GetFidSsrc(0u, &rtx_ssrc));
+  EXPECT_EQ(0xdeadbeef, rtx_ssrc);
+}
+
+// No encodings should be accepted; an endpoint may want to prepare a
+// decoder/encoder without having something to receive/send yet.
+TEST(RtpParametersConversionTest, ToStreamParamsVecNoEncodings) {
+  std::vector<RtpEncodingParameters> encodings;
+  auto result = ToStreamParamsVec(encodings);
+  ASSERT_TRUE(result.ok());
+  EXPECT_EQ(0u, result.value().size());
+}
+
+// An encoding without SSRCs should be accepted. This could be the case when
+// SSRCs aren't signaled and payload-type based demuxing is used.
+TEST(RtpParametersConversionTest, ToStreamParamsVecMissingSsrcs) {
+  std::vector<RtpEncodingParameters> encodings = {{}};
+  // Creates RtxParameters with empty SSRC.
+  encodings[0].rtx.emplace();
+  auto result = ToStreamParamsVec(encodings);
+  ASSERT_TRUE(result.ok());
+  EXPECT_EQ(0u, result.value().size());
+}
+
+// The media engine doesn't have a way of receiving an RTX SSRC that's known
+// with a primary SSRC that's unknown, so this should produce an error.
+TEST(RtpParametersConversionTest, ToStreamParamsWithPrimarySsrcSetAndRtxUnset) {
+  std::vector<RtpEncodingParameters> encodings = {{}};
+  encodings[0].rtx.emplace(0xdeadbeef);
+  EXPECT_EQ(RTCErrorType::UNSUPPORTED_PARAMETER,
+            ToStreamParamsVec(encodings).error().type());
+}
+
+// TODO(deadbeef): Update this test when we support multiple encodings.
+TEST(RtpParametersConversionTest, ToStreamParamsVecMultipleEncodings) {
+  std::vector<RtpEncodingParameters> encodings = {{}, {}};
+  auto result = ToStreamParamsVec(encodings);
+  EXPECT_EQ(RTCErrorType::UNSUPPORTED_PARAMETER, result.error().type());
+}
+
+TEST(RtpParametersConversionTest, ToRtcpFeedback) {
+  rtc::Optional<RtcpFeedback> result = ToRtcpFeedback({"ccm", "fir"});
+  EXPECT_EQ(RtcpFeedback(RtcpFeedbackType::CCM, RtcpFeedbackMessageType::FIR),
+            *result);
+  result = ToRtcpFeedback(cricket::FeedbackParam("nack"));
+  EXPECT_EQ(RtcpFeedback(RtcpFeedbackType::NACK,
+                         RtcpFeedbackMessageType::GENERIC_NACK),
+            *result);
+  result = ToRtcpFeedback({"nack", "pli"});
+  EXPECT_EQ(RtcpFeedback(RtcpFeedbackType::NACK, RtcpFeedbackMessageType::PLI),
+            *result);
+  result = ToRtcpFeedback(cricket::FeedbackParam("goog-remb"));
+  EXPECT_EQ(RtcpFeedback(RtcpFeedbackType::REMB), *result);
+  result = ToRtcpFeedback(cricket::FeedbackParam("transport-cc"));
+  EXPECT_EQ(RtcpFeedback(RtcpFeedbackType::TRANSPORT_CC), *result);
+}
+
+TEST(RtpParametersConversionTest, ToRtcpFeedbackErrors) {
+  // CCM with missing or invalid message type.
+  rtc::Optional<RtcpFeedback> result = ToRtcpFeedback({"ccm", "pli"});
+  EXPECT_FALSE(result);
+  result = ToRtcpFeedback(cricket::FeedbackParam("ccm"));
+  EXPECT_FALSE(result);
+  // NACK with missing or invalid message type.
+  result = ToRtcpFeedback({"nack", "fir"});
+  EXPECT_FALSE(result);
+  // REMB with message type (should be left empty).
+  result = ToRtcpFeedback({"goog-remb", "pli"});
+  EXPECT_FALSE(result);
+  // TRANSPORT_CC with message type (should be left empty).
+  result = ToRtcpFeedback({"transport-cc", "fir"});
+  EXPECT_FALSE(result);
+  // Unknown message type.
+  result = ToRtcpFeedback(cricket::FeedbackParam("foo"));
+  EXPECT_FALSE(result);
+}
+
+TEST(RtpParametersConversionTest, ToAudioRtpCodecCapability) {
+  cricket::AudioCodec cricket_codec;
+  cricket_codec.name = "foo";
+  cricket_codec.id = 50;
+  cricket_codec.clockrate = 22222;
+  cricket_codec.channels = 4;
+  cricket_codec.params["foo"] = "bar";
+  cricket_codec.feedback_params.Add(cricket::FeedbackParam("transport-cc"));
+  RtpCodecCapability codec = ToRtpCodecCapability(cricket_codec);
+
+  EXPECT_EQ("foo", codec.name);
+  EXPECT_EQ(cricket::MEDIA_TYPE_AUDIO, codec.kind);
+  EXPECT_EQ(rtc::Optional<int>(50), codec.preferred_payload_type);
+  EXPECT_EQ(rtc::Optional<int>(22222), codec.clock_rate);
+  EXPECT_EQ(rtc::Optional<int>(4), codec.num_channels);
+  ASSERT_EQ(1u, codec.parameters.size());
+  EXPECT_EQ("bar", codec.parameters["foo"]);
+  EXPECT_EQ(1u, codec.rtcp_feedback.size());
+  EXPECT_EQ(RtcpFeedback(RtcpFeedbackType::TRANSPORT_CC),
+            codec.rtcp_feedback[0]);
+}
+
+TEST(RtpParametersConversionTest, ToVideoRtpCodecCapability) {
+  cricket::VideoCodec cricket_codec;
+  cricket_codec.name = "VID";
+  cricket_codec.id = 101;
+  cricket_codec.clockrate = 80000;
+  cricket_codec.params["foo"] = "bar";
+  cricket_codec.params["ANOTHER"] = "param";
+  cricket_codec.feedback_params.Add(cricket::FeedbackParam("transport-cc"));
+  cricket_codec.feedback_params.Add({"nack", "pli"});
+  RtpCodecCapability codec = ToRtpCodecCapability(cricket_codec);
+
+  EXPECT_EQ("VID", codec.name);
+  EXPECT_EQ(cricket::MEDIA_TYPE_VIDEO, codec.kind);
+  EXPECT_EQ(rtc::Optional<int>(101), codec.preferred_payload_type);
+  EXPECT_EQ(rtc::Optional<int>(80000), codec.clock_rate);
+  ASSERT_EQ(2u, codec.parameters.size());
+  EXPECT_EQ("bar", codec.parameters["foo"]);
+  EXPECT_EQ("param", codec.parameters["ANOTHER"]);
+  EXPECT_EQ(2u, codec.rtcp_feedback.size());
+  EXPECT_EQ(RtcpFeedback(RtcpFeedbackType::TRANSPORT_CC),
+            codec.rtcp_feedback[0]);
+  EXPECT_EQ(RtcpFeedback(RtcpFeedbackType::NACK, RtcpFeedbackMessageType::PLI),
+            codec.rtcp_feedback[1]);
+}
+
+// An unknown feedback param should just be ignored.
+TEST(RtpParametersConversionTest, ToRtpCodecCapabilityUnknownFeedbackParam) {
+  cricket::AudioCodec cricket_codec;
+  cricket_codec.name = "foo";
+  cricket_codec.id = 50;
+  cricket_codec.clockrate = 22222;
+  cricket_codec.channels = 4;
+  cricket_codec.params["foo"] = "bar";
+  cricket_codec.feedback_params.Add({"unknown", "param"});
+  cricket_codec.feedback_params.Add(cricket::FeedbackParam("transport-cc"));
+  RtpCodecCapability codec = ToRtpCodecCapability(cricket_codec);
+
+  ASSERT_EQ(1u, codec.rtcp_feedback.size());
+  EXPECT_EQ(RtcpFeedback(RtcpFeedbackType::TRANSPORT_CC),
+            codec.rtcp_feedback[0]);
+}
+
+// Most of ToRtpCapabilities is tested by ToRtpCodecCapability, but we need to
+// test that the result of ToRtpCodecCapability ends up in the result, and that
+// the "fec" list is assembled correctly.
+TEST(RtpParametersConversionTest, ToRtpCapabilities) {
+  cricket::VideoCodec vp8;
+  vp8.name = "VP8";
+  vp8.id = 101;
+  vp8.clockrate = 90000;
+
+  cricket::VideoCodec red;
+  red.name = "red";
+  red.id = 102;
+  red.clockrate = 90000;
+
+  cricket::VideoCodec ulpfec;
+  ulpfec.name = "ulpfec";
+  ulpfec.id = 103;
+  ulpfec.clockrate = 90000;
+
+  cricket::VideoCodec flexfec;
+  flexfec.name = "flexfec-03";
+  flexfec.id = 102;
+  flexfec.clockrate = 90000;
+
+  RtpCapabilities capabilities = ToRtpCapabilities<cricket::VideoCodec>(
+      {vp8, ulpfec}, {{"uri", 1}, {"uri2", 3}});
+  ASSERT_EQ(2u, capabilities.codecs.size());
+  EXPECT_EQ("VP8", capabilities.codecs[0].name);
+  EXPECT_EQ("ulpfec", capabilities.codecs[1].name);
+  ASSERT_EQ(2u, capabilities.header_extensions.size());
+  EXPECT_EQ("uri", capabilities.header_extensions[0].uri);
+  EXPECT_EQ(1, capabilities.header_extensions[0].preferred_id);
+  EXPECT_EQ("uri2", capabilities.header_extensions[1].uri);
+  EXPECT_EQ(3, capabilities.header_extensions[1].preferred_id);
+  EXPECT_EQ(0u, capabilities.fec.size());
+
+  capabilities = ToRtpCapabilities<cricket::VideoCodec>(
+      {vp8, red, ulpfec}, cricket::RtpHeaderExtensions());
+  EXPECT_EQ(3u, capabilities.codecs.size());
+  EXPECT_EQ(2u, capabilities.fec.size());
+  EXPECT_NE(capabilities.fec.end(),
+            std::find(capabilities.fec.begin(), capabilities.fec.end(),
+                      FecMechanism::RED));
+  EXPECT_NE(capabilities.fec.end(),
+            std::find(capabilities.fec.begin(), capabilities.fec.end(),
+                      FecMechanism::RED_AND_ULPFEC));
+
+  capabilities = ToRtpCapabilities<cricket::VideoCodec>(
+      {vp8, red, flexfec}, cricket::RtpHeaderExtensions());
+  EXPECT_EQ(3u, capabilities.codecs.size());
+  EXPECT_EQ(2u, capabilities.fec.size());
+  EXPECT_NE(capabilities.fec.end(),
+            std::find(capabilities.fec.begin(), capabilities.fec.end(),
+                      FecMechanism::RED));
+  EXPECT_NE(capabilities.fec.end(),
+            std::find(capabilities.fec.begin(), capabilities.fec.end(),
+                      FecMechanism::FLEXFEC));
+}
+
+}  // namespace webrtc