Tuan Nghia Nguyen 53a82da74a Add nvJPEG GPU-accelerated JPEG encoding with NVIDIA auto-detection ...

BmpToJpeg was slow (~25-45ms for 4K) due to two bottlenecks:
1. cv::imdecode for BMP parsing (unnecessary for uncompressed BMP)
2. TurboJPEG CPU encoding (~11ms for 4K)

Fix 1: Zero-copy BMP parsing — parse header directly and wrap pixel
data in cv::Mat without allocation or copy. Eliminates ~47MB of heap
allocations per 4K frame.

Fix 2: NvJpegCompressor class using nvJPEG hardware encoder on NVIDIA
GPUs (~1-2ms for 4K). Integrated into CompressJpegToString so all 5
JPEG encoding callsites benefit automatically. Reusable GPU buffer
avoids per-frame cudaMalloc/cudaFree. Silent fallback to TurboJPEG
on Intel/AMD or if nvJPEG fails.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

2026-04-16 07:50:13 +10:00

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