c3fcee7c3a
This is a refactor to simplify a follow-up CL of adding SdpVideoFormat::IsSameCodec. The original files media/base/h264_profile_level_id.* and media/base/vp9_profile.h must be kept until downstream projects stop using them. Bug: chroimium:1187565 Change-Id: Ib39eca095a3d61939a914d9bffaf4b891ddd222f Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/215236 Reviewed-by: Harald Alvestrand <hta@webrtc.org> Reviewed-by: Kári Helgason <kthelgason@webrtc.org> Reviewed-by: Niels Moller <nisse@webrtc.org> Reviewed-by: Mirko Bonadei <mbonadei@webrtc.org> Commit-Queue: Johannes Kron <kron@webrtc.org> Cr-Commit-Position: refs/heads/master@{#33782}
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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