How to add cuda to webrtc native?

[johnso...@gmail.com]

Hi,

I am adding hardware acceleration (nvenc) to webrtc native but am stucked in compiling webrtc with cuda.

I have created a new rtc_library called 'nvenc_h264' to replace 'webrtc_h264'. The BUILD.gn looks like following:

rtc_library("nvenc_h264") {
  visibility = [ "*" ]
  sources = [
    "/usr/local/cuda/include/cuda.h",
    "codecs/h264/h264_nvenc_encoder.cc",
    "codecs/h264/h264_nvenc_encoder.h",
    "codecs/h264/h264_nvenc_decoder.cc",
    "codecs/h264/h264_nvenc_decoder.h",
    "codecs/h264/nvEncodeAPI.h",
    "codecs/h264/NvEncoder.cc",
    "codecs/h264/NvEncoder.h",
    "codecs/h264/NvEncoderCuda.cc",
    "codecs/h264/NvEncoderCuda.h",
  ]

  defines = []
 
  lib_dirs = [
    "/home/lix16/Workspace/webrtc/src/build/linux/debian_bullseye_amd64-sysroot/usr/lib/x86_64-linux-gnu"
  ]

  libs = [
    "cuda",
  ]

  deps = [
    ":video_codec_interface",
    ":video_coding_utility",
    "../../api/video:video_frame",
    "../../api/video:video_frame_i010",
    "../../api/video:video_rtp_headers",
    "../../api/video_codecs:scalability_mode",
    "../../api/video_codecs:video_codecs_api",
    "../../common_video",
    "../../media:rtc_media_base",
    "../../rtc_base",
    "../../rtc_base:checks",
    "../../rtc_base:event_tracer",
    "../../rtc_base:logging",
    "../../rtc_base:timeutils",
    "../../rtc_base/system:rtc_export",
    "../../system_wrappers:field_trial",
    "../../system_wrappers:metrics",
    "//third_party/libyuv",
  ]
  absl_deps = [
    "//third_party/abseil-cpp/absl/container:inlined_vector",
    "//third_party/abseil-cpp/absl/strings",
    "//third_party/abseil-cpp/absl/types: optional",
  ]
}

I have manually copied libcuda.so.1 from my home system to /home/lix16/Workspace/webrtc/src/build/linux/debian_bullseye_amd64-sysroot/usr/lib/x86_64-linux-gnu. However, the ld still complains about not finding cuda:
ld.lld: error: unable to find library -lcuda

Any idea of solving this issue? If I am adding cuda in a wrong way, please give me insights on a better solution.

Thanks a lot.

Regards,

Xuebing

[Johnson Li]

The problem is solved by using cuda's original path:

lib_dirs = [
    "/usr/local/cuda-12.1/targets/x86_64-linux/lib/stubs",
]