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feat(encode): add Jetson Multimedia API encoder backend

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Integrate a native Jetson Multimedia API encoder path and keep the existing encoded access-unit contract for RTMP, RTP, and recording consumers.

This adds conditional Jetson MMAPI detection in CMake, builds the required NVIDIA sample common classes into a dedicated support library, and compiles the new backend only when the platform dependencies are present.

The runtime selector now lets encoder.backend=auto prefer Jetson MM for NVIDIA hardware requests while keeping encoder.backend=ffmpeg as an explicit FFmpeg path. Device selection semantics are updated so nvidia requires the Jetson backend, auto can fall back to FFmpeg software, and software remains FFmpeg-only.

The Jetson backend converts supported raw inputs through swscale, feeds NvVideoEncoder in YUV420M, emits Annex-B access units, and harvests decoder configuration from a warmup keyframe so downstream packetizers keep their existing contract.

This also splits FFmpeg encoder option handling into a shared header, updates runtime config/help text and tester defaults, and refreshes compatibility/caveat documentation to reflect the new selection behavior.

Build-tree runtime RPATH handling is tightened so GCC 15 builds keep the matching libstdc++ visible locally. Verification covered GCC 15 builds, RTP H.264/H.265 tester runs, RTMP H.264 stub publish, local live SRS smoke with cvmmap://zed1, and remote execution on 192.168.2.155 using the deployed bundle lib directory for the GCC 15 runtime.
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crosstyan
2026-04-15 18:37:44 +08:00
parent 16a1a38645
commit 51d03d4279
12 changed files with 1538 additions and 323 deletions
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docs/compat_matrix.md
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@@ -27,7 +27,7 @@ Notes:
- RTMP is Enhanced RTMP only.
- The custom RTMP packetizer and domestic mode are removed.
- `encoder.backend` remains `auto|ffmpeg`; both resolve to FFmpeg.
- `encoder.backend` remains `auto|ffmpeg`; `auto` may select Jetson Multimedia API on Jetson builds, while `ffmpeg` forces the FFmpeg encoder path.
## Optional Checks (Non-Blocking)
@@ -60,7 +60,7 @@ Current recording scope:
| Setting | Value |
|---------|-------|
| Encoder backend | `auto` -> FFmpeg |
| Encoder backend | `auto` -> Jetson MM on Jetson hardware requests, else FFmpeg |
| RTMP transport | `libavformat` |
| RTMP mode | Enhanced only |
| Encoder device | `auto` |