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/*
* Copyright (c) 2019 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 MEDIA_BASE_SDP_VIDEO_FORMAT_UTILS_H_
#define MEDIA_BASE_SDP_VIDEO_FORMAT_UTILS_H_
#include "absl/types/optional.h"
#include "api/video_codecs/sdp_video_format.h"
namespace webrtc {
// Generate codec parameters that will be used as answer in an SDP negotiation
// based on local supported parameters and remote offered parameters. Both
// `local_supported_params`, `remote_offered_params`, and `answer_params`
// represent sendrecv media descriptions, i.e they are a mix of both encode and
// decode capabilities. In theory, when the profile in `local_supported_params`
// represent a strict superset of the profile in `remote_offered_params`, we
// could limit the profile in `answer_params` to the profile in
// `remote_offered_params`. However, to simplify the code, each supported H264
// profile should be listed explicitly in the list of local supported codecs,
// even if they are redundant. Then each local codec in the list should be
// tested one at a time against the remote codec, and only when the profiles are
// equal should this function be called. Therefore, this function does not need
// to handle profile intersection, and the profile of `local_supported_params`
// and `remote_offered_params` must be equal before calling this function. The
// parameters that are used when negotiating are the level part of
// profile-level-id and level-asymmetry-allowed.
void H264GenerateProfileLevelIdForAnswer(
const SdpVideoFormat::Parameters& local_supported_params,
const SdpVideoFormat::Parameters& remote_offered_params,
SdpVideoFormat::Parameters* answer_params);
// Parse max frame rate from SDP FMTP line. absl::nullopt is returned if the
// field is missing or not a number.
absl::optional<int> ParseSdpForVPxMaxFrameRate(
const SdpVideoFormat::Parameters& params);
// Parse max frame size from SDP FMTP line. absl::nullopt is returned if the
// field is missing or not a number. Please note that the value is stored in sub
// blocks but the returned value is in total number of pixels.
absl::optional<int> ParseSdpForVPxMaxFrameSize(
const SdpVideoFormat::Parameters& params);
} // namespace webrtc
#endif // MEDIA_BASE_SDP_VIDEO_FORMAT_UTILS_H_
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