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de17252e8e
This is a reland of commit 63d03f586b
Original change's description:
> Unify access to SDP codec parameters
>
> which come from the a=fmtp:<pt> lines in the SDP and were used as either
> std::map<std::string, std:string>
> with three aliases,
> cricket::CodecParameterMap
> SdpAudioFormat::Parameters
> SdpVideoFormat::Parameters
>
> Use webrtc::CodecParameterMap in all places.
>
> BUG=None
>
> Change-Id: If47692bde7347834c349c6539b43309d8770e67b
> Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/330420
> Reviewed-by: Florent Castelli <orphis@webrtc.org>
> Reviewed-by: Harald Alvestrand <hta@webrtc.org>
> Commit-Queue: Philipp Hancke <phancke@microsoft.com>
> Cr-Commit-Position: refs/heads/main@{#41375}
Bug: None
Change-Id: I5f8f45688df232eb37b12fa3e56a893a1c754e17
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/331402
Reviewed-by: Harald Alvestrand <hta@webrtc.org>
Reviewed-by: Florent Castelli <orphis@webrtc.org>
Commit-Queue: Philipp Hancke <phancke@microsoft.com>
Cr-Commit-Position: refs/heads/main@{#41467}
92 lines
2.9 KiB
C++
92 lines
2.9 KiB
C++
/*
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* Copyright (c) 2021 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 API_VIDEO_CODECS_H264_PROFILE_LEVEL_ID_H_
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#define API_VIDEO_CODECS_H264_PROFILE_LEVEL_ID_H_
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#include <string>
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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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#include "rtc_base/system/rtc_export.h"
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namespace webrtc {
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enum class H264Profile {
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kProfileConstrainedBaseline,
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kProfileBaseline,
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kProfileMain,
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kProfileConstrainedHigh,
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kProfileHigh,
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kProfilePredictiveHigh444,
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};
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// All values are equal to ten times the level number, except level 1b which is
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// special.
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enum class H264Level {
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kLevel1_b = 0,
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kLevel1 = 10,
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kLevel1_1 = 11,
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kLevel1_2 = 12,
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kLevel1_3 = 13,
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kLevel2 = 20,
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kLevel2_1 = 21,
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kLevel2_2 = 22,
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kLevel3 = 30,
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kLevel3_1 = 31,
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kLevel3_2 = 32,
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kLevel4 = 40,
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kLevel4_1 = 41,
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kLevel4_2 = 42,
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kLevel5 = 50,
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kLevel5_1 = 51,
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kLevel5_2 = 52
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};
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struct H264ProfileLevelId {
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constexpr H264ProfileLevelId(H264Profile profile, H264Level level)
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: profile(profile), level(level) {}
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H264Profile profile;
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H264Level level;
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};
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// Parse profile level id that is represented as a string of 3 hex bytes.
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// Nothing will be returned if the string is not a recognized H264
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// profile level id.
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absl::optional<H264ProfileLevelId> ParseH264ProfileLevelId(const char* str);
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// Parse profile level id that is represented as a string of 3 hex bytes
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// contained in an SDP key-value map. A default profile level id will be
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// returned if the profile-level-id key is missing. Nothing will be returned if
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// the key is present but the string is invalid.
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RTC_EXPORT absl::optional<H264ProfileLevelId> ParseSdpForH264ProfileLevelId(
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const CodecParameterMap& params);
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// Given that a decoder supports up to a given frame size (in pixels) at up to a
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// given number of frames per second, return the highest H.264 level where it
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// can guarantee that it will be able to support all valid encoded streams that
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// are within that level.
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RTC_EXPORT absl::optional<H264Level> H264SupportedLevel(
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int max_frame_pixel_count,
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float max_fps);
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// Returns canonical string representation as three hex bytes of the profile
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// level id, or returns nothing for invalid profile level ids.
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RTC_EXPORT absl::optional<std::string> H264ProfileLevelIdToString(
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const H264ProfileLevelId& profile_level_id);
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// Returns true if the parameters have the same H264 profile (Baseline, High,
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// etc).
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RTC_EXPORT bool H264IsSameProfile(const CodecParameterMap& params1,
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const CodecParameterMap& params2);
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} // namespace webrtc
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#endif // API_VIDEO_CODECS_H264_PROFILE_LEVEL_ID_H_
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