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

webrtc/ortc/rtpparametersconversion.cc

Index: webrtc/ortc/rtpparametersconversion.cc
diff --git a/webrtc/ortc/rtpparametersconversion.cc b/webrtc/ortc/rtpparametersconversion.cc
new file mode 100644
index 0000000000000000000000000000000000000000..63ee9c74dac6aec07b304fa73739a4834e2d145b
--- /dev/null
+++ b/webrtc/ortc/rtpparametersconversion.cc
@@ -0,0 +1,376 @@
+/*
+ *  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 "webrtc/ortc/rtpparametersconversion.h"
+
+#include <set>
+#include <sstream>
+#include <utility>
+
+#include "webrtc/media/base/rtputils.h"
+
+namespace webrtc {
+
+RTCErrorOr<cricket::FeedbackParam> ToCricketFeedbackParam(
+    const RtcpFeedback& feedback) {
+  switch (feedback.type) {
+    case RtcpFeedbackType::CCM:
+      if (!feedback.message_type) {
+        LOG_AND_RETURN_ERROR(RTCErrorType::INVALID_PARAMETER,
+                             "Missing message type in CCM RtcpFeedback.");
+      } else if (*feedback.message_type != RtcpFeedbackMessageType::FIR) {
+        LOG_AND_RETURN_ERROR(RTCErrorType::INVALID_PARAMETER,
+                             "Invalid message type in CCM RtcpFeedback.");
+      }
+      return cricket::FeedbackParam(cricket::kRtcpFbParamCcm,
+                                    cricket::kRtcpFbCcmParamFir);
+    case RtcpFeedbackType::NACK:
+      if (!feedback.message_type) {
+        LOG_AND_RETURN_ERROR(RTCErrorType::INVALID_PARAMETER,
+                             "Missing message type in NACK RtcpFeedback.");
+      }
+      switch (*feedback.message_type) {
+        case RtcpFeedbackMessageType::GENERIC_NACK:
+          return cricket::FeedbackParam(cricket::kRtcpFbParamNack);
+        case RtcpFeedbackMessageType::PLI:
+          return cricket::FeedbackParam(cricket::kRtcpFbParamNack,
+                                        cricket::kRtcpFbNackParamPli);
+        default:
+          LOG_AND_RETURN_ERROR(RTCErrorType::INVALID_PARAMETER,
+                               "Invalid message type in NACK RtcpFeedback.");
+      }
+    case RtcpFeedbackType::REMB:
+      if (feedback.message_type) {
+        LOG_AND_RETURN_ERROR(
+            RTCErrorType::INVALID_PARAMETER,
+            "Didn't expect message type in REMB RtcpFeedback.");
+      }
+      return cricket::FeedbackParam(cricket::kRtcpFbParamRemb);
+    case RtcpFeedbackType::TRANSPORT_CC:
+      if (feedback.message_type) {
+        LOG_AND_RETURN_ERROR(
+            RTCErrorType::INVALID_PARAMETER,
+            "Didn't expect message type in transport-cc RtcpFeedback.");
+      }
+      return cricket::FeedbackParam(cricket::kRtcpFbParamTransportCc);
+  }
+  // Not reached; avoids compile warning.
+  FATAL();
+}
+
+template <typename C>
+static RTCError ToCricketCodecTypeSpecific(const RtpCodecParameters& codec,
+                                           C* cricket_codec);
+
+template <>
+RTCError ToCricketCodecTypeSpecific<cricket::AudioCodec>(
+    const RtpCodecParameters& codec,
+    cricket::AudioCodec* cricket_codec) {
+  if (codec.kind != cricket::MEDIA_TYPE_AUDIO) {
+    LOG_AND_RETURN_ERROR(
+        RTCErrorType::INVALID_PARAMETER,
+        "Can't use video codec with audio sender or receiver.");
+  }
+  if (!codec.num_channels) {
+    LOG_AND_RETURN_ERROR(RTCErrorType::INVALID_PARAMETER,
+                         "Missing number of channels for audio codec.");
+  }
+  if (*codec.num_channels <= 0) {
+    LOG_AND_RETURN_ERROR(RTCErrorType::INVALID_RANGE,
+                         "Number of channels must be positive.");
+  }
+  cricket_codec->channels = *codec.num_channels;
+  if (!codec.clock_rate) {
+    LOG_AND_RETURN_ERROR(RTCErrorType::INVALID_PARAMETER,
+                         "Missing codec clock rate.");
+  }
+  if (*codec.clock_rate <= 0) {
+    LOG_AND_RETURN_ERROR(RTCErrorType::INVALID_RANGE,
+                         "Clock rate must be positive.");
+  }
+  cricket_codec->clockrate = *codec.clock_rate;
+  return RTCError::OK();
+}
+
+// Video codecs don't use num_channels or clock_rate, but they should at least
+// be validated to ensure the application isn't trying to do something it
+// doesn't intend to.
+template <>
+RTCError ToCricketCodecTypeSpecific<cricket::VideoCodec>(
+    const RtpCodecParameters& codec,
+    cricket::VideoCodec*) {
+  if (codec.kind != cricket::MEDIA_TYPE_VIDEO) {
+    LOG_AND_RETURN_ERROR(
+        RTCErrorType::INVALID_PARAMETER,
+        "Can't use audio codec with video sender or receiver.");
+  }
+  if (codec.num_channels) {
+    LOG_AND_RETURN_ERROR(RTCErrorType::INVALID_PARAMETER,
+                         "Video codec shouldn't have num_channels.");
+  }
+  if (!codec.clock_rate) {
+    LOG_AND_RETURN_ERROR(RTCErrorType::INVALID_PARAMETER,
+                         "Missing codec clock rate.");
+  }
+  if (*codec.clock_rate != cricket::kVideoCodecClockrate) {
+    LOG_AND_RETURN_ERROR(RTCErrorType::INVALID_PARAMETER,
+                         "Video clock rate must be 90000.");
+  }
+  return RTCError::OK();
+}
+
+template <typename C>
+RTCErrorOr<C> ToCricketCodec(const RtpCodecParameters& codec) {
+  C cricket_codec;
+  // Start with audio/video specific conversion.
+  RTCError err = ToCricketCodecTypeSpecific(codec, &cricket_codec);
+  if (!err.ok()) {
+    return std::move(err);
+  }
+  cricket_codec.name = codec.name;
+  if (!cricket::IsValidRtpPayloadType(codec.payload_type)) {
+    std::ostringstream oss;
+    oss << "Invalid payload type: " << codec.payload_type;
+    LOG_AND_RETURN_ERROR(RTCErrorType::INVALID_RANGE, oss.str());
+  }
+  cricket_codec.id = codec.payload_type;
+  for (const RtcpFeedback& feedback : codec.rtcp_feedback) {
+    auto result = ToCricketFeedbackParam(feedback);
+    if (!result.ok()) {
+      return result.MoveError();
+    }
+    cricket_codec.AddFeedbackParam(result.MoveValue());
+  }
+  cricket_codec.params.insert(codec.parameters.begin(), codec.parameters.end());
+  return std::move(cricket_codec);
+}
+
+template RTCErrorOr<cricket::AudioCodec> ToCricketCodec(
+    const RtpCodecParameters& codec);
+template RTCErrorOr<cricket::VideoCodec> ToCricketCodec(
+    const RtpCodecParameters& codec);
+
+template <typename C>
+RTCErrorOr<std::vector<C>> ToCricketCodecs(
+    const std::vector<RtpCodecParameters>& codecs) {
+  std::vector<C> cricket_codecs;
+  std::set<int> seen_payload_types;
+  for (const RtpCodecParameters& codec : codecs) {
+    auto result = ToCricketCodec<C>(codec);
+    if (!result.ok()) {
+      return result.MoveError();
+    }
+    if (!seen_payload_types.insert(codec.payload_type).second) {
+      std::ostringstream oss;
+      oss << "Duplicate payload type: " << codec.payload_type;
+      LOG_AND_RETURN_ERROR(RTCErrorType::INVALID_PARAMETER, oss.str());
+    }
+    cricket_codecs.push_back(result.MoveValue());
+  }
+  return std::move(cricket_codecs);
+}
+
+template RTCErrorOr<std::vector<cricket::AudioCodec>> ToCricketCodecs<
+    cricket::AudioCodec>(const std::vector<RtpCodecParameters>& codecs);
+
+template RTCErrorOr<std::vector<cricket::VideoCodec>> ToCricketCodecs<
+    cricket::VideoCodec>(const std::vector<RtpCodecParameters>& codecs);
+
+RTCErrorOr<cricket::RtpHeaderExtensions> ToCricketRtpHeaderExtensions(
+    const std::vector<RtpHeaderExtensionParameters>& extensions) {
+  cricket::RtpHeaderExtensions cricket_extensions;
+  std::ostringstream err_writer;
+  std::set<int> seen_header_extension_ids;
+  for (const RtpHeaderExtensionParameters& extension : extensions) {
+    if (extension.id < RtpHeaderExtensionParameters::kMinId ||
+        extension.id > RtpHeaderExtensionParameters::kMaxId) {
+      err_writer << "Invalid header extension id: " << extension.id;
+      LOG_AND_RETURN_ERROR(RTCErrorType::INVALID_RANGE, err_writer.str());
+    }
+    if (!seen_header_extension_ids.insert(extension.id).second) {
+      err_writer << "Duplicate header extension id: " << extension.id;
+      LOG_AND_RETURN_ERROR(RTCErrorType::INVALID_PARAMETER, err_writer.str());
+    }
+    cricket_extensions.push_back(extension);
+  }
+  return std::move(cricket_extensions);
+}
+
+RTCErrorOr<cricket::StreamParamsVec> ToCricketStreamParamsVec(
+    const std::vector<RtpEncodingParameters>& encodings) {
+  if (encodings.size() > 1u) {
+    LOG_AND_RETURN_ERROR(RTCErrorType::UNSUPPORTED_PARAMETER,
+                         "ORTC API implementation doesn't currently "
+                         "support simulcast or layered encodings.");
+  } else if (encodings.empty()) {
+    return cricket::StreamParamsVec();
+  }
+  cricket::StreamParamsVec cricket_streams;
+  const RtpEncodingParameters& encoding = encodings[0];
+  if (encoding.rtx && encoding.rtx->ssrc && !encoding.ssrc) {
+    LOG_AND_RETURN_ERROR(RTCErrorType::UNSUPPORTED_PARAMETER,
+                         "Setting an RTX SSRC explicitly while leaving the "
+                         "primary SSRC unset is not currently supported.");
+  }
+  if (encoding.ssrc) {
+    cricket::StreamParams stream_params;
+    stream_params.add_ssrc(*encoding.ssrc);
+    if (encoding.rtx && encoding.rtx->ssrc) {
+      stream_params.AddFidSsrc(*encoding.ssrc, *encoding.rtx->ssrc);
+    }
+    cricket_streams.push_back(std::move(stream_params));
+  }
+  return std::move(cricket_streams);
+}
+
+rtc::Optional<RtcpFeedback> ToRtcpFeedback(
+    const cricket::FeedbackParam& cricket_feedback) {
+  if (cricket_feedback.id() == cricket::kRtcpFbParamCcm) {
+    if (cricket_feedback.param() == cricket::kRtcpFbCcmParamFir) {
+      return rtc::Optional<RtcpFeedback>(
+          {RtcpFeedbackType::CCM, RtcpFeedbackMessageType::FIR});
+    } else {
+      LOG(LS_WARNING) << "Unsupported parameter for CCM RTCP feedback: "
+                      << cricket_feedback.param();
+      return rtc::Optional<RtcpFeedback>();
+    }
+  } else if (cricket_feedback.id() == cricket::kRtcpFbParamNack) {
+    if (cricket_feedback.param().empty()) {
+      return rtc::Optional<RtcpFeedback>(
+          {RtcpFeedbackType::NACK, RtcpFeedbackMessageType::GENERIC_NACK});
+    } else if (cricket_feedback.param() == cricket::kRtcpFbNackParamPli) {
+      return rtc::Optional<RtcpFeedback>(
+          {RtcpFeedbackType::NACK, RtcpFeedbackMessageType::PLI});
+    } else {
+      LOG(LS_WARNING) << "Unsupported parameter for NACK RTCP feedback: "
+                      << cricket_feedback.param();
+      return rtc::Optional<RtcpFeedback>();
+    }
+  } else if (cricket_feedback.id() == cricket::kRtcpFbParamRemb) {
+    if (!cricket_feedback.param().empty()) {
+      LOG(LS_WARNING) << "Unsupported parameter for REMB RTCP feedback: "
+                      << cricket_feedback.param();
+      return rtc::Optional<RtcpFeedback>();
+    } else {
+      return rtc::Optional<RtcpFeedback>(RtcpFeedback(RtcpFeedbackType::REMB));
+    }
+  } else if (cricket_feedback.id() == cricket::kRtcpFbParamTransportCc) {
+    if (!cricket_feedback.param().empty()) {
+      LOG(LS_WARNING)
+          << "Unsupported parameter for transport-cc RTCP feedback: "
+          << cricket_feedback.param();
+      return rtc::Optional<RtcpFeedback>();
+    } else {
+      return rtc::Optional<RtcpFeedback>(
+          RtcpFeedback(RtcpFeedbackType::TRANSPORT_CC));
+    }
+  }
+  LOG(LS_WARNING) << "Unsupported RTCP feedback type: "
+                  << cricket_feedback.id();
+  return rtc::Optional<RtcpFeedback>();
+}
+
+template <typename C>
+cricket::MediaType KindOfCodec();
+
+template <>
+cricket::MediaType KindOfCodec<cricket::AudioCodec>() {
+  return cricket::MEDIA_TYPE_AUDIO;
+}
+
+template <>
+cricket::MediaType KindOfCodec<cricket::VideoCodec>() {
+  return cricket::MEDIA_TYPE_VIDEO;
+}
+
+template <typename C>
+static void ToRtpCodecCapabilityTypeSpecific(const C& cricket_codec,
+                                             RtpCodecCapability* codec);
+
+template <>
+void ToRtpCodecCapabilityTypeSpecific<cricket::AudioCodec>(
+    const cricket::AudioCodec& cricket_codec,
+    RtpCodecCapability* codec) {
+  codec->num_channels =
+      rtc::Optional<int>(static_cast<int>(cricket_codec.channels));
+}
+
+template <>
+void ToRtpCodecCapabilityTypeSpecific<cricket::VideoCodec>(
+    const cricket::VideoCodec& cricket_codec,
+    RtpCodecCapability* codec) {}
+
+template <typename C>
+RtpCodecCapability ToRtpCodecCapability(const C& cricket_codec) {
+  RtpCodecCapability codec;
+  codec.name = cricket_codec.name;
+  codec.kind = KindOfCodec<C>();
+  codec.clock_rate.emplace(cricket_codec.clockrate);
+  codec.preferred_payload_type.emplace(cricket_codec.id);
+  for (const cricket::FeedbackParam& cricket_feedback :
+       cricket_codec.feedback_params.params()) {
+    rtc::Optional<RtcpFeedback> feedback = ToRtcpFeedback(cricket_feedback);
+    if (feedback) {
+      codec.rtcp_feedback.push_back(feedback.MoveValue());
+    }
+  }
+  ToRtpCodecCapabilityTypeSpecific(cricket_codec, &codec);
+  codec.parameters.insert(cricket_codec.params.begin(),
+                          cricket_codec.params.end());
+  return codec;
+}
+
+template RtpCodecCapability ToRtpCodecCapability<cricket::AudioCodec>(
+    const cricket::AudioCodec& cricket_codec);
+template RtpCodecCapability ToRtpCodecCapability<cricket::VideoCodec>(
+    const cricket::VideoCodec& cricket_codec);
+
+template <class C>
+RtpCapabilities ToRtpCapabilities(
+    const std::vector<C>& cricket_codecs,
+    const cricket::RtpHeaderExtensions& cricket_extensions) {
+  RtpCapabilities capabilities;
+  bool have_red = false;
+  bool have_ulpfec = false;
+  bool have_flexfec = false;
+  for (const C& cricket_codec : cricket_codecs) {
+    if (cricket_codec.name == cricket::kRedCodecName) {
+      have_red = true;
+    } else if (cricket_codec.name == cricket::kUlpfecCodecName) {
+      have_ulpfec = true;
+    } else if (cricket_codec.name == cricket::kFlexfecCodecName) {
+      have_flexfec = true;
+    }
+    capabilities.codecs.push_back(ToRtpCodecCapability(cricket_codec));
+  }
+  for (const RtpExtension& cricket_extension : cricket_extensions) {
+    capabilities.header_extensions.emplace_back(cricket_extension.uri,
+                                                cricket_extension.id);
+  }
+  if (have_red) {
+    capabilities.fec.push_back(FecMechanism::RED);
+  }
+  if (have_red && have_ulpfec) {
+    capabilities.fec.push_back(FecMechanism::RED_AND_ULPFEC);
+  }
+  if (have_flexfec) {
+    capabilities.fec.push_back(FecMechanism::FLEXFEC);
+  }
+  return capabilities;
+}
+
+template RtpCapabilities ToRtpCapabilities<cricket::AudioCodec>(
+    const std::vector<cricket::AudioCodec>& cricket_codecs,
+    const cricket::RtpHeaderExtensions& cricket_extensions);
+template RtpCapabilities ToRtpCapabilities<cricket::VideoCodec>(
+    const std::vector<cricket::VideoCodec>& cricket_codecs,
+    const cricket::RtpHeaderExtensions& cricket_extensions);
+
+}  // namespace webrtc