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/*
* Copyright (c) 2021 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 API_VIDEO_CODECS_H264_PROFILE_LEVEL_ID_H_
#define API_VIDEO_CODECS_H264_PROFILE_LEVEL_ID_H_
#include <string>
#include "absl/types/optional.h"
#include "api/video_codecs/sdp_video_format.h"
#include "rtc_base/system/rtc_export.h"
namespace webrtc {
enum class H264Profile {
kProfileConstrainedBaseline,
kProfileBaseline,
kProfileMain,
kProfileConstrainedHigh,
kProfileHigh,
kProfilePredictiveHigh444,
};
// All values are equal to ten times the level number, except level 1b which is
// special.
enum class H264Level {
kLevel1_b = 0,
kLevel1 = 10,
kLevel1_1 = 11,
kLevel1_2 = 12,
kLevel1_3 = 13,
kLevel2 = 20,
kLevel2_1 = 21,
kLevel2_2 = 22,
kLevel3 = 30,
kLevel3_1 = 31,
kLevel3_2 = 32,
kLevel4 = 40,
kLevel4_1 = 41,
kLevel4_2 = 42,
kLevel5 = 50,
kLevel5_1 = 51,
kLevel5_2 = 52
};
struct H264ProfileLevelId {
constexpr H264ProfileLevelId(H264Profile profile, H264Level level)
: profile(profile), level(level) {}
H264Profile profile;
H264Level level;
};
// Parse profile level id that is represented as a string of 3 hex bytes.
// Nothing will be returned if the string is not a recognized H264
// profile level id.
absl::optional<H264ProfileLevelId> ParseH264ProfileLevelId(const char* str);
// Parse profile level id that is represented as a string of 3 hex bytes
// contained in an SDP key-value map. A default profile level id will be
// returned if the profile-level-id key is missing. Nothing will be returned if
// the key is present but the string is invalid.
RTC_EXPORT absl::optional<H264ProfileLevelId> ParseSdpForH264ProfileLevelId(
const SdpVideoFormat::Parameters& params);
// Given that a decoder supports up to a given frame size (in pixels) at up to a
// given number of frames per second, return the highest H.264 level where it
// can guarantee that it will be able to support all valid encoded streams that
// are within that level.
RTC_EXPORT absl::optional<H264Level> H264SupportedLevel(
int max_frame_pixel_count,
float max_fps);
// Returns canonical string representation as three hex bytes of the profile
// level id, or returns nothing for invalid profile level ids.
RTC_EXPORT absl::optional<std::string> H264ProfileLevelIdToString(
const H264ProfileLevelId& profile_level_id);
// Returns true if the parameters have the same H264 profile (Baseline, High,
// etc).
RTC_EXPORT bool H264IsSameProfile(const SdpVideoFormat::Parameters& params1,
const SdpVideoFormat::Parameters& params2);
} // namespace webrtc
#endif // API_VIDEO_CODECS_H264_PROFILE_LEVEL_ID_H_
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