[DO-971] ffmpeg recipe with requirements (!9)

Co-authored-by: aleksandr.vodyanov <aleksandr.vodyanov@avroid.tech>
Reviewed-on: https://git.avroid.tech/Conan/conan_build/pulls/9

recipes/openh264/all/conanfile.py

@@ -0,0 +1,126 @@
+from conan import ConanFile
+from conan.tools.build import stdcpp_library, cross_building
+from conan.tools.env import VirtualBuildEnv
+from conan.tools.files import copy, get, rmdir, rm, rename, replace_in_file
+from conan.tools.layout import basic_layout
+from conan.tools.microsoft import is_msvc
+from conan.tools.apple import fix_apple_shared_install_name
+from conan.tools.scm import Version
+from conan.tools.meson import Meson, MesonToolchain
+from conan.errors import ConanInvalidConfiguration
+
+import os
+
+
+required_conan_version = ">=2.0.9"
+
+
+class OpenH264Conan(ConanFile):
+    name = "openh264"
+    description = "Open Source H.264 Codec"
+    license = "BSD-2-Clause"
+    url = "https://github.com/conan-io/conan-center-index"
+    homepage = "http://www.openh264.org/"
+    topics = ("h264", "codec", "video", "compression", )
+    package_type = "library"
+    settings = "os", "arch", "compiler", "build_type"
+    options = {
+        "shared": [True, False],
+        "fPIC": [True, False],
+    }
+    default_options = {
+        "shared": False,
+        "fPIC": True,
+    }
+    implements = ["auto_shared_fpic"]
+
+    @property
+    def _is_clang_cl(self):
+        return self.settings.os == 'Windows' and self.settings.compiler == 'clang'
+
+    @property
+    def _preserve_dll_name(self):
+        return (is_msvc(self) or self._is_clang_cl) and Version(self.version) <= "2.4.1" and self.options.shared
+
+    def layout(self):
+        basic_layout(self, src_folder="src")
+
+    def build_requirements(self):
+        #self.tool_requires("meson/1.4.1")
+        if not self.conf.get("tools.gnu:pkg_config", default=False, check_type=str):
+            self.tool_requires("pkgconf/[>=2.2 <3]")
+        if self.settings.arch in ["x86", "x86_64"]:
+            self.tool_requires("nasm/2.16.01")
+
+    def validate(self):
+        if Version(self.version) <= "2.1.1" and self.settings.os in ["Android", "Macos"]:
+            # INFO: ../src/meson.build:86:2: ERROR: Problem encountered: FIXME: Unhandled system android
+            # INFO: ../src/meson.build:86:2: ERROR: Problem encountered: FIXME: Unhandled system darwin
+            raise ConanInvalidConfiguration(f"{self.ref} does not support {self.settings.os}. Try a newer version.")
+
+    def source(self):
+        get(self, **self.conan_data["sources"][self.version],
+            destination=self.source_folder, strip_root=True)
+
+    def generate(self):
+        env = VirtualBuildEnv(self)
+        env.generate()
+        tc = MesonToolchain(self)
+        tc.project_options["tests"] = "disabled"
+        tc.generate()
+
+    def _patch_sources(self):
+        if self._preserve_dll_name:
+            # INFO: When generating with Meson, the library name is openh264-7.dll. This change preserves the old name openh264.dll
+            replace_in_file(self, os.path.join(self.source_folder, "meson.build"), "soversion: major_version,", "soversion: '',")
+
+    def build(self):
+        self._patch_sources()
+        meson = Meson(self)
+        meson.configure()
+        meson.build()
+
+    def package(self):
+        copy(self, pattern="LICENSE", dst=os.path.join(self.package_folder, "licenses"), src=self.source_folder)
+        meson = Meson(self)
+        meson.install()
+
+        rmdir(self, os.path.join(self.package_folder, "lib", "pkgconfig"))
+        # INFO: Version 2.1.1 installs both static and shared libraries using same target name
+        if Version(self.version) <= "2.1.1":
+            if self.options.shared:
+                rm(self, "*.a", os.path.join(self.package_folder, "lib"))
+            else:
+                rm(self, "*.so*", os.path.join(self.package_folder, "lib"))
+                rm(self, "*.dylib*", os.path.join(self.package_folder, "lib"))
+                rm(self, "*.dll", os.path.join(self.package_folder, "bin"))
+                rm(self, "openh264.lib", os.path.join(self.package_folder, "lib"))
+
+        if is_msvc(self) or self._is_clang_cl:
+            rm(self, "*.pdb", os.path.join(self.package_folder, "bin"))
+            if Version(self.version) <= "2.4.1":
+                if self.options.shared:
+                    # INFO: Preserve same old library name as when building with Make on Windows but using Meson
+                    rename(self, os.path.join(self.package_folder, "lib", "openh264.lib"),
+                           os.path.join(self.package_folder, "lib", "openh264_dll.lib"))
+            if not self.options.shared:
+                rename(self, os.path.join(self.package_folder, "lib", "libopenh264.a"),
+                        os.path.join(self.package_folder, "lib", "openh264.lib"))
+        fix_apple_shared_install_name(self)
+
+    def package_info(self):
+        suffix = "_dll" if self._preserve_dll_name else ""
+        self.cpp_info.libs = [f"openh264{suffix}"]
+        if self.settings.os in ("FreeBSD", "Linux"):
+            self.cpp_info.system_libs.extend(["m", "pthread"])
+        if self.settings.os == "Android":
+            self.cpp_info.system_libs.append("m")
+        if not self.options.shared:
+            libcxx = stdcpp_library(self)
+            if libcxx:
+                if self.settings.os == "Android" and libcxx == "c++_static":
+                    # INFO: When builing for Android, need to link against c++abi too. Otherwise will get linkage errors:
+                    # ld.lld: error: undefined symbol: operator new(unsigned long)
+                    # >>> referenced by welsEncoderExt.cpp
+                    self.cpp_info.system_libs.append("c++abi")
+                self.cpp_info.system_libs.append(libcxx)