nvdec: Add meson build with Windows support

meson_options.txt

@@ -113,6 +113,7 @@ option('mplex', type : 'feature', value : 'auto', description : 'mplex audio/vid
 option('msdk', type : 'feature', value : 'auto', description : 'Intel Media SDK video encoder/decoder plugin')
 option('musepack', type : 'feature', value : 'auto', description : 'libmpcdec Musepack decoder plugin')
 option('neon', type : 'feature', value : 'auto', description : 'NEON HTTP source plugin')
+option('nvdec', type : 'feature', value : 'auto', description : 'NVIDIA GPU decoder plugin')
 option('openh264', type : 'feature', value : 'auto', description : 'H.264 video codec plugin')
 option('openjpeg', type : 'feature', value : 'auto', description : 'JPEG2000 image codec plugin')
 option('opensles', type : 'feature', value : 'auto', description : 'OpenSL ES audio source/sink plugin')

sys/meson.build

@@ -15,7 +15,6 @@ subdir('fbdev')
 subdir('ipcpipeline')
 subdir('kms')
 subdir('msdk')
-#subdir('nvenc')
 subdir('opensles')
 subdir('shm')
 subdir('uvch264')
@@ -24,3 +23,90 @@ subdir('uvch264')
 subdir('wasapi')
 subdir('winks')
 subdir('winscreencap')
+
+# CUDA dependency
+cuda_dep = dependency('', required : false)
+cudart_dep = dependency('', required : false)
+cuda_libdir = ''
+cuda_incdir = ''
+
+if host_machine.system() == 'windows'
+  # On windows, CUDA_PATH env will be set by installer
+  cuda_root = run_command(python3, '-c', 'import os; print(os.environ.get("CUDA_PATH"))').stdout().strip()
+  if cuda_root != ''
+    arc = ''
+    if build_machine.cpu_family() == 'x86_64'
+      arc = 'x64'
+    else
+      arc = 'Win32'
+    endif
+    cuda_libdir = join_paths (cuda_root, 'lib', arc)
+    cuda_incdir = join_paths (cuda_root, 'include')
+    cuda_lib = cc.find_library('cuda', dirs: cuda_libdir, required: false)
+    cudart_lib = cc.find_library('cudart', dirs: cuda_libdir, required: false)
+    if cuda_lib.found()
+      cuda_header_found = cc.has_header('cuda.h', args: '-I' + cuda_incdir)
+      cuda_lib_found = cc.has_function('cuInit', dependencies: cuda_lib)
+      if cuda_header_found and cuda_lib_found
+        cuda_dep = declare_dependency(include_directories: include_directories(cuda_incdir),
+                                      dependencies: cuda_lib)
+      endif
+    endif
+
+    if cudart_lib.found()
+      cudart_header_found = cc.has_header('cuda_runtime_api.h', args: '-I' + cuda_incdir)
+      cudart_lib_found = cc.has_function('cudaGetErrorString', dependencies: cudart_lib)
+      if cudart_header_found and cudart_lib_found
+        cudart_dep = declare_dependency(dependencies: cudart_lib)
+      endif
+    endif
+  endif
+else
+  cuda_versions = [
+    '10.0',
+    '9.2',
+    '9.1',
+    '9.0',
+    '8.0',
+    '7.5',
+    '7.0',
+    '6.5',
+  ]
+  cuda_ver = ''
+
+  # FIXME: use break syntax when we use meson >= '0.49'
+  foreach v : cuda_versions
+    if cuda_ver == ''
+      cuda_dep = dependency('cuda-' + v, required: false)
+      cudart_dep = dependency('cudart-' + v, required: false)
+      if cuda_dep.found() and cudart_dep.found()
+        cuda_ver = v
+      endif
+    endif
+  endforeach
+
+  if cuda_dep.found()
+    cuda_header_found = cc.has_header('cuda.h', dependencies: cuda_dep)
+    cuda_lib_found = cc.has_function('cuInit', dependencies: cuda_dep)
+    if not cuda_header_found or not cuda_lib_found
+      message ('Missing required header and/or function in cuda dependency')
+      cuda_dep = dependency('', required : false)
+    endif
+  endif
+
+  if cudart_dep.found()
+    cudart_header_found = cc.has_header('cuda_runtime_api.h', dependencies: cudart_dep)
+    cudart_lib_found = cc.has_function('cudaGetErrorString', dependencies: cudart_dep)
+    if not cudart_header_found or not cudart_lib_found
+      message ('Missing required header and/or function in cudart dependency')
+      cudart_dep = dependency('', required : false)
+    endif
+  endif
+endif
+
+if cuda_dep.found() and cudart_dep.found()
+  subdir('nvdec')
+  #subdir('nvenc')
+elif get_option('nvdec').enabled()
+  error('The nvdec plugin was enabled explicitly, but required CUDA dependencies were not found.')
+endif

sys/nvdec/meson.build

@@ -0,0 +1,38 @@
+nvdec_sources = [
+  'gstnvdec.c',
+  'plugin.c'
+]
+
+nvdec_option = get_option('nvdec')
+if nvdec_option.disabled()
+  subdir_done()
+endif
+
+nvcuvid_dep_found = false
+if host_machine.system() == 'windows'
+  nvcuvid_lib = cc.find_library('nvcuvid', dirs: cuda_libdir, required: nvdec_option)
+else
+  nvcuvid_lib = cc.find_library('nvcuvid', required: nvdec_option)
+endif
+
+if nvcuvid_lib.found() and cc.has_function('cuvidCtxLock', dependencies: nvcuvid_lib)
+  nvcuvid_dep = declare_dependency(dependencies: nvcuvid_lib)
+  nvcuvid_dep_found = true
+endif
+
+if nvdec_option.enabled() and not nvcuvid_dep_found
+  error('The nvdec plugin was enabled explicitly, but required nvcuvid library was not found.')
+endif
+
+if nvcuvid_dep_found
+  gstnvdec = library('gstnvdec',
+    nvdec_sources,
+    c_args : gst_plugins_bad_args,
+    include_directories : [configinc],
+    dependencies : [gstbase_dep, gstvideo_dep, gstpbutils_dep, gstgl_dep, cuda_dep, cudart_dep, nvcuvid_dep],
+    install : true,
+    install_dir : plugins_install_dir,
+  )
+  pkgconfig.generate(gstnvdec, install_dir : plugins_pkgconfig_install_dir)
+endif
+