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/*
* 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.
*/
#ifndef PC_RTP_PARAMETERS_CONVERSION_H_
#define PC_RTP_PARAMETERS_CONVERSION_H_
#include <vector>
#include "absl/types/optional.h"
#include "api/rtc_error.h"
#include "api/rtp_parameters.h"
#include "media/base/codec.h"
#include "media/base/stream_params.h"
#include "pc/session_description.h"
namespace webrtc {
// NOTE: Some functions are templated for convenience, such that template-based
// code dealing with AudioContentDescription and VideoContentDescription can
// use this easily. Such methods are usable with cricket::AudioCodec and
// cricket::VideoCodec.
//***************************************************************************
// Functions for converting from new webrtc:: structures to old cricket::
// structures.
//
// As the return values imply, all of these functions do validation of the
// parameters and return an error if they're invalid. It's expected that any
// default values (such as video clock rate of 90000) have been filled by the
// time the webrtc:: structure is being converted to the cricket:: one.
//
// These are expected to be used when parameters are passed into an RtpSender
// or RtpReceiver, and need to be validated and converted so they can be
// applied to the media engine level.
//***************************************************************************
// Returns error on invalid input. Certain message types are only valid for
// certain feedback types.
RTCErrorOr<cricket::FeedbackParam> ToCricketFeedbackParam(
const RtcpFeedback& feedback);
// Verifies that the codec kind is correct, and it has mandatory parameters
// filled, with values in valid ranges.
template <typename C>
RTCErrorOr<C> ToCricketCodec(const RtpCodecParameters& codec);
// Verifies that payload types aren't duplicated, in addition to normal
// validation.
template <typename C>
RTCErrorOr<std::vector<C>> ToCricketCodecs(
const std::vector<RtpCodecParameters>& codecs);
// SSRCs are allowed to be ommitted. This may be used for receive parameters
// where SSRCs are unsignaled.
RTCErrorOr<cricket::StreamParamsVec> ToCricketStreamParamsVec(
const std::vector<RtpEncodingParameters>& encodings);
//*****************************************************************************
// Functions for converting from old cricket:: structures to new webrtc::
// structures. Unlike the above functions, these are permissive with regards to
// input validation; it's assumed that any necessary validation already
// occurred.
//
// These are expected to be used either to convert from audio/video engine
// capabilities to RtpCapabilities, or to convert from already-parsed SDP
// (in the form of cricket:: structures) to webrtc:: structures. The latter
// functionality is not yet implemented.
//*****************************************************************************
// Returns empty value if `cricket_feedback` is a feedback type not
// supported/recognized.
absl::optional<RtcpFeedback> ToRtcpFeedback(
const cricket::FeedbackParam& cricket_feedback);
std::vector<RtpEncodingParameters> ToRtpEncodings(
const cricket::StreamParamsVec& stream_params);
template <typename C>
RtpCodecParameters ToRtpCodecParameters(const C& cricket_codec);
template <typename C>
RtpCodecCapability ToRtpCodecCapability(const C& cricket_codec);
template <class C>
RtpCapabilities ToRtpCapabilities(
const std::vector<C>& cricket_codecs,
const cricket::RtpHeaderExtensions& cricket_extensions);
template <class C>
RtpParameters ToRtpParameters(
const std::vector<C>& cricket_codecs,
const cricket::RtpHeaderExtensions& cricket_extensions,
const cricket::StreamParamsVec& stream_params);
} // namespace webrtc
#endif // PC_RTP_PARAMETERS_CONVERSION_H_
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