37f664f6d5
Bug: webrtc:12338 Change-Id: Ia800a4017ede1f647b36f809ef3c5b37a2616fdd Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/226949 Reviewed-by: Harald Alvestrand <hta@webrtc.org> Commit-Queue: Artem Titov <titovartem@webrtc.org> Cr-Commit-Position: refs/heads/master@{#34567}
53 lines
2.6 KiB
C++
53 lines
2.6 KiB
C++
/*
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* Copyright (c) 2019 The WebRTC project authors. All Rights Reserved.
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*
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* Use of this source code is governed by a BSD-style license
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* that can be found in the LICENSE file in the root of the source
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* tree. An additional intellectual property rights grant can be found
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* in the file PATENTS. All contributing project authors may
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* be found in the AUTHORS file in the root of the source tree.
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*/
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#ifndef MEDIA_BASE_SDP_VIDEO_FORMAT_UTILS_H_
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#define MEDIA_BASE_SDP_VIDEO_FORMAT_UTILS_H_
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#include "absl/types/optional.h"
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#include "api/video_codecs/sdp_video_format.h"
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namespace webrtc {
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// Generate codec parameters that will be used as answer in an SDP negotiation
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// based on local supported parameters and remote offered parameters. Both
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// `local_supported_params`, `remote_offered_params`, and `answer_params`
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// represent sendrecv media descriptions, i.e they are a mix of both encode and
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// decode capabilities. In theory, when the profile in `local_supported_params`
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// represent a strict superset of the profile in `remote_offered_params`, we
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// could limit the profile in `answer_params` to the profile in
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// `remote_offered_params`. However, to simplify the code, each supported H264
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// profile should be listed explicitly in the list of local supported codecs,
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// even if they are redundant. Then each local codec in the list should be
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// tested one at a time against the remote codec, and only when the profiles are
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// equal should this function be called. Therefore, this function does not need
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// to handle profile intersection, and the profile of `local_supported_params`
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// and `remote_offered_params` must be equal before calling this function. The
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// parameters that are used when negotiating are the level part of
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// profile-level-id and level-asymmetry-allowed.
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void H264GenerateProfileLevelIdForAnswer(
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const SdpVideoFormat::Parameters& local_supported_params,
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const SdpVideoFormat::Parameters& remote_offered_params,
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SdpVideoFormat::Parameters* answer_params);
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// Parse max frame rate from SDP FMTP line. absl::nullopt is returned if the
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// field is missing or not a number.
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absl::optional<int> ParseSdpForVPxMaxFrameRate(
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const SdpVideoFormat::Parameters& params);
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// Parse max frame size from SDP FMTP line. absl::nullopt is returned if the
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// field is missing or not a number. Please note that the value is stored in sub
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// blocks but the returned value is in total number of pixels.
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absl::optional<int> ParseSdpForVPxMaxFrameSize(
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const SdpVideoFormat::Parameters& params);
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} // namespace webrtc
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#endif // MEDIA_BASE_SDP_VIDEO_FORMAT_UTILS_H_
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