feat(video): detect HDR Vivid metadata in performance overlay

[qiin2333]

改了啥呀

• 新增 HEVC Annex-B SEI 扫描器，支持跨 scatter segment 起始码、RBSP 防竞争字节，以及 prefix/suffix SEI
• 按 CUVA 005.1 的 T.35 标识 0x26 / 0x0004 / 0x0005 判断真实 HDR Vivid 动态元数据
• 将检测结果通过 native stats、NAPI 和 StreamingSession 送到性能覆盖层
• 解码器标签现在区分 HDR PQ、HDR HLG 和 HDR Vivid
• 补充有效 CUVA、普通 HEVC、HDR10+、分段输入和防竞争字节测试

为啥要改

HLG 配置只能说明传输函数，不能证明码流真的带了 HDR Vivid 动态元数据。现在直接看码流证据，纯 HLG 不用再被杂鱼误判硬塞成 Vivid 啦。

扫描仅发生在 HEVC HLG 会话开始阶段，命中后保持会话状态，避免给正常解码路径增加持续开销。

验证

• c++ -std=c++17 -Wall -Wextra -Werror -I nativelib/src/main/cpp nativelib/src/main/cpp/hdr_vivid_metadata_scanner.cpp nativelib/src/test/cpp/hdr_vivid_metadata_scanner_test.cpp -o /tmp/moonlight_hdr_vivid_scanner_test && /tmp/moonlight_hdr_vivid_scanner_test
• npm run check:scripts
• DEVECO_SDK_HOME=/Users/mac/ohos-sdk-cache/6.1-Release-mac/sdk-ci-shape JAVA_HOME=/Applications/DevEco-Studio.app/Contents/jbr/Contents/Home node hvigorw.js assembleApp --mode project -p product=default -p buildMode=debug --no-daemon
• Hvigor 完整构建成功；仅有仓库原有的设备类型、签名和 API 弃用警告

Summary by CodeRabbit

• 新功能

  • 新增 HDR Vivid 内容检测，可在播放统计中显示检测结果。
  • 性能面板中的解码器信息支持更精确区分 HDR Vivid、HDR HLG 和 HDR PQ。

• 问题修复

  • 优化 HDR 视频解码信息展示，确保其与实际视频元数据保持一致。

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Review details

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: CHILL

Plan: Pro Plus

Run ID: d9e58fc3-cebf-4fce-9068-50b3651d1699

📥 Commits

Reviewing files that changed from the base of the PR and between 7cca95c and 10a54a6.

📒 Files selected for processing (3)

• nativelib/src/main/cpp/video_decoder.cpp
• nativelib/src/main/cpp/video_decoder.h
• nativelib/src/test/cpp/hdr_vivid_metadata_scanner_test.cpp

📝 Walkthrough

Walkthrough

新增 HDR Vivid 元数据扫描器，在 HEVC HLG 解码过程中检测 CUVA T.35 SEI，并将结果经 native bridge 与串流统计传递至性能覆盖层，显示 HDR Vivid、HLG 或 PQ 解码器信息。

Changes

HDR Vivid 检测链路

Layer / File(s)	Summary
CUVA 元数据扫描器 nativelib/src/main/cpp/hdr_vivid_metadata_scanner.*, nativelib/src/main/cpp/CMakeLists.txt	新增支持分段 Annex-B 数据、SEI/RBSP 解析、CUVA 标识匹配的扫描器，并加入 native 构建。
解码器探测与统计输出 nativelib/src/main/cpp/video_decoder.*, nativelib/src/main/cpp/moonlight_bridge.cpp	VideoDecoder 在限定的 HEVC HLG 解码单元中执行扫描，并将检测结果加入视频统计和 bridge 返回对象。
串流统计与覆盖层展示 entry/src/main/ets/service/streaming/StreamingSession.ets, entry/src/main/ets/components/PerformanceOverlay*.ets	串流统计传递 hdrVivid，覆盖层同步该状态，并生成 HDR Vivid、HLG 或 PQ 解码器文案。
扫描器行为验证 nativelib/src/test/cpp/hdr_vivid_metadata_scanner_test.cpp	测试分段输入、前后缀 SEI、无关 T.35 数据及仿真防护字节场景。

Estimated code review effort: 4 (Complex) | ~45 minutes

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 14.29% which is insufficient. The required threshold is 80.00%.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	标题准确概括了本次变更：在性能覆盖层中检测并展示 HDR Vivid 元数据。
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch codex/hdr-vivid-overlay-detection

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[coderabbitai]

Actionable comments posted: 1

🤖 Prompt for all review comments with AI agents

Verify each finding against current code. Fix only still-valid issues, skip the
rest with a brief reason, keep changes minimal, and validate.

Inline comments:
In `@nativelib/src/test/cpp/hdr_vivid_metadata_scanner_test.cpp`:
- Line 28: Replace the sole assert in main’s ScanSegments test with an explicit
failure check that remains active in release builds. When ScanSegments(segments)
returns false, emit an error message and return a nonzero status; retain the
success path only when scanning succeeds.

🪄 Autofix (Beta)

Fix all unresolved CodeRabbit comments on this PR:

• Push a commit to this branch (recommended)
• Create a new PR with the fixes

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: CHILL

Plan: Pro Plus

Run ID: fc7bc75c-e44e-4a9d-8aaf-7ecb76f5b55b

📥 Commits

Reviewing files that changed from the base of the PR and between de28af2 and 7cca95c.

📒 Files selected for processing (10)

• entry/src/main/ets/components/PerformanceOverlay.ets
• entry/src/main/ets/components/PerformanceOverlayManager.ets
• entry/src/main/ets/service/streaming/StreamingSession.ets
• nativelib/src/main/cpp/CMakeLists.txt
• nativelib/src/main/cpp/hdr_vivid_metadata_scanner.cpp
• nativelib/src/main/cpp/hdr_vivid_metadata_scanner.h
• nativelib/src/main/cpp/moonlight_bridge.cpp
• nativelib/src/main/cpp/video_decoder.cpp
• nativelib/src/main/cpp/video_decoder.h
• nativelib/src/test/cpp/hdr_vivid_metadata_scanner_test.cpp