| # Copyright 2014 The Chromium Authors. All rights reserved. |
| # Use of this source code is governed by a BSD-style license that can be |
| # found in the LICENSE file. |
| |
| import("ffmpeg_generated.gni") |
| import("ffmpeg_options.gni") |
| |
| import("//build/buildflag_header.gni") |
| import("//build/config/compiler/compiler.gni") |
| import("//build/config/sanitizers/sanitizers.gni") |
| |
| # Path to platform configuration files. |
| platform_config_root = |
| "chromium/config/$ffmpeg_branding/$os_config/$ffmpeg_arch" |
| |
| has_nasm_deps = |
| ffmpeg_asm_sources != [] && |
| (current_cpu == "x86" || current_cpu == "x64") && os_config != "linux-noasm" |
| if (has_nasm_deps) { |
| import("//third_party/nasm/nasm_assemble.gni") |
| |
| # x86inc.asm ignores the PIC flag when compiling for x86 which unfortunately |
| # causes text relocations in the object files generated by the assembler. We |
| # must disable the warning to allow linking with lld. Unlike gold, ld which |
| # will silently allow text relocations, lld support must be explicit. |
| # |
| # See https://crbug.com/911658#c19 for more information. Tracked upstream at |
| # https://trac.ffmpeg.org/ticket/7878 |
| config("fix_textrels") { |
| ldflags = [ "-Wl,-z,notext" ] |
| } |
| |
| nasm_assemble("ffmpeg_nasm") { |
| sources = ffmpeg_asm_sources |
| |
| # Ensure the architecture defines go in the command line before the -P |
| # file below, so don't use defines. |
| nasm_flags = [] |
| if (current_cpu == "x86") { |
| nasm_flags += [ "-DARCH_X86_32" ] |
| } else if (current_cpu == "x64") { |
| nasm_flags += [ "-DARCH_X86_64" ] |
| } |
| |
| inputs = [ |
| # Sets visibility hidden for cglobal functions. Explicitly included |
| # to avoid overlooking changes to this file in incremental builds. |
| "libavutil/x86/x86inc.asm", |
| ] |
| |
| defines = [ "PIC" ] |
| include_dirs = [ |
| platform_config_root, |
| "libavcodec/x86", |
| "libavutil/x86", |
| ".", |
| ] |
| |
| nasm_flags += [ |
| "-W+error=all", |
| "-Wno-macro-params-legacy", |
| "-P" + rebase_path("$platform_config_root/config.asm", root_build_dir), |
| ] |
| |
| if (is_mac) { |
| # Necessary to ensure symbols end up with a _ prefix; added by |
| # yasm_assemble.gni for Windows, but not Mac. |
| defines += [ "PREFIX" ] |
| } |
| |
| # See comments on fix_textrels config. |
| if (use_lld && current_cpu == "x86" && !is_win) { |
| all_dependent_configs = [ ":fix_textrels" ] |
| } |
| } |
| } |
| |
| config("ffmpeg_dependent_config") { |
| include_dirs = [ |
| platform_config_root, |
| ".", |
| ] |
| } |
| |
| if (is_win) { |
| # Stub generator script and signatures of all functions used by Chrome. |
| generate_stubs_script = "//tools/generate_stubs/generate_stubs.py" |
| |
| # Used by ffmpeg_generate_stubs and ffmpeg_generate_def |
| sig_files = [ "chromium/ffmpeg.sigs" ] |
| |
| action("ffmpeg_generate_def") { |
| script = generate_stubs_script |
| sources = sig_files |
| outputs = [ |
| "$target_gen_dir/ffmpeg.def", |
| ] |
| args = [ |
| "-i", |
| rebase_path(target_out_dir, root_build_dir), |
| "-o", |
| rebase_path(target_gen_dir, root_build_dir), |
| "-t", |
| "windows_def", |
| "-m", |
| "ffmpeg.dll", |
| ] + rebase_path(sources, root_build_dir) |
| } |
| } |
| |
| # gn orders flags on a target before flags from configs. The default config |
| # adds -Wall, and these flags have to be after -Wall -- so they need to come |
| # from a config and can't be on the target directly. |
| config("ffmpeg_warnings") { |
| if (is_clang) { |
| cflags = [ |
| "-Wno-absolute-value", |
| |
| # ffmpeg uses its own deprecated functions. |
| "-Wno-deprecated-declarations", |
| |
| # ffmpeg doesn't care about pointer constness. |
| "-Wno-incompatible-pointer-types", |
| |
| # ffmpeg doesn't follow usual parentheses conventions. |
| "-Wno-logical-op-parentheses", |
| |
| # ffmpeg doesn't care about pointer signedness. |
| "-Wno-parentheses", |
| |
| # ffmpeg doesn't care about pointer signedness. |
| "-Wno-pointer-sign", |
| |
| # ffmpeg doesn't believe in exhaustive switch statements. |
| "-Wno-switch", |
| |
| # matroskadec.c has a "failed:" label that's only used if some |
| # CONFIG_ flags we don't set are set. |
| "-Wno-unused-label", |
| |
| # ffmpeg has a lot of unused variables. |
| "-Wno-unused-variable", |
| |
| # This fires on `av_assert0(!"valid element size")` in utils.c |
| "-Wno-string-conversion", |
| |
| # This fires on `pos_min` and `pos_max` in |
| # autorename_libavformat_utils.c |
| "-Wno-sometimes-uninitialized", |
| |
| # clock_gettime is marked as 10.12+ in the 10.12 SDK, but ffmpeg does |
| # correctly check for that before calling. |
| "-Wno-unguarded-availability", |
| |
| # ffmpeg contains static functions in header files, which lead |
| # to unused function warnings. There are a few legit unused |
| # functions too. |
| "-Wno-unused-function", |
| |
| # vp3data.h's vp31_inter_dequant stores '128' in an int8_t array. |
| "-Wno-constant-conversion", |
| |
| # utils.c does |
| # `return LICENSE_PREFIX FFMPEG_LICENSE + sizeof(LICENSE_PREFIX) - 1;` |
| # while -Wstring-plus-int wants &FFMPEG_LICENSE[sizeof(LICENSE_PREFIX)-1] |
| "-Wno-string-plus-int", |
| |
| # video_enc_params.c has a condition that is always false when size_t is |
| # 64 bits. |
| "-Wno-tautological-constant-out-of-range-compare", |
| ] |
| |
| if (target_cpu == "arm" || target_cpu == "arm64") { |
| # ffmpeg uses ARM instructions that clang deems deprecated. |
| cflags += [ "-Wno-inline-asm" ] |
| } |
| |
| if (is_win) { |
| # This corresponds to /wd4273 below. |
| cflags += [ "-Wno-inconsistent-dllimport" ] |
| } |
| } |
| } |
| |
| buildflag_header("ffmpeg_features") { |
| header = "ffmpeg_features.h" |
| flags = [ "USE_SYSTEM_FFMPEG=false" ] |
| } |
| |
| if (is_component_ffmpeg) { |
| link_target_type = "source_set" |
| } else { |
| # This must be a static_library in non-component builds to avoid pulling |
| # in many large global arrays (and associated code) into chrome.dll. |
| link_target_type = "static_library" |
| } |
| target(link_target_type, "ffmpeg_internal") { |
| sources = ffmpeg_c_sources + ffmpeg_gas_sources + [ |
| "$platform_config_root/config.h", |
| "$platform_config_root/libavutil/avconfig.h", |
| ] |
| include_dirs = [ |
| platform_config_root, |
| ".", |
| ] |
| defines = [ |
| "HAVE_AV_CONFIG_H", |
| "_POSIX_C_SOURCE=200112", |
| "_XOPEN_SOURCE=600", |
| "PIC", |
| "FFMPEG_CONFIGURATION=NULL", |
| ] |
| |
| if (is_component_ffmpeg) { |
| configs += [ "//build/config/sanitizers:cfi_icall_disable" ] |
| } |
| |
| # Disable internal ffmpeg logs in the official build; this saves ~158kb. |
| if (is_official_build) { |
| defines += [ "CHROMIUM_NO_LOGGING" ] |
| } |
| |
| # So we can append below and assume they're defined. |
| cflags = [] |
| ldflags = [] |
| libs = [] |
| deps = [ |
| ":ffmpeg_features", |
| "//third_party/opus", |
| ] |
| |
| configs -= [ "//build/config/compiler:chromium_code" ] |
| configs += [ |
| "//build/config/compiler:no_chromium_code", |
| |
| # These must be after no_chromium_code for warning flags to be ordered |
| # correctly. |
| "//build/config/compiler:no_incompatible_pointer_warnings", |
| ":ffmpeg_warnings", |
| ] |
| |
| # Since we are not often debugging FFmpeg, and performance is |
| # unacceptable without optimization, freeze the optimizations to -O2. |
| # If someone really wants -O1 , they can change these in their checkout. |
| # If you want -O0, see the Gotchas in README.Chromium for why that |
| # won't work. |
| # |
| # In addition to the above reasons, /Od optimization won't remove symbols |
| # that are under "if (0)" style sections. Which lead to link time errors |
| # when for example it tries to link an ARM symbol on X86. |
| configs -= [ "//build/config/compiler:default_optimization" ] |
| configs += [ "//build/config/compiler:optimize_max" ] |
| |
| if (ffmpeg_use_unsafe_atomics) { |
| if (is_posix || is_fuchsia) { |
| include_dirs += [ "compat/atomics/gcc" ] |
| } else if (is_win) { |
| include_dirs += [ "compat/atomics/win32" ] |
| } |
| } |
| |
| # On x86, sanitizers will fail to compiler the H264 CABAC code due to |
| # insufficient registers unless we disable EBP usage. https://crbug.com/786760 |
| # |
| # Windows builds can't compile without EBP because we can't omit frame |
| # pointers like we do on posix. |
| if (current_cpu == "x86") { |
| if (using_sanitizer || is_win || use_lld) { |
| defines += [ "HAVE_EBP_AVAILABLE=0" ] |
| } else { |
| defines += [ "HAVE_EBP_AVAILABLE=1" ] |
| } |
| |
| # Despite the name, this isn't fixing any bugs with the linker. It's just |
| # preventing ffmpeg from silently emitting text relocations. See discussion |
| # https://crbug.com/911658#c19 and https://trac.ffmpeg.org/ticket/7878 |
| if (use_lld && !is_win) { |
| defines += [ "BROKEN_RELOCATIONS=1" ] |
| } |
| } |
| |
| if (is_fuchsia || is_posix) { |
| cflags += [ |
| "-fPIC", |
| |
| # ffmpeg uses its own deprecated functions. |
| "-Wno-deprecated-declarations", |
| ] |
| |
| if (!(is_android && use_call_graph)) { |
| # Remove default stack frames config so we can force -fomit-frame-pointer. |
| configs -= [ "//build/config/compiler:default_stack_frames" ] |
| |
| cflags += [ |
| "-fomit-frame-pointer", |
| ] |
| } |
| |
| if (!is_clang) { |
| # gcc doesn't have flags for specific warnings, so disable them |
| # all. |
| cflags += [ "-w" ] |
| } |
| |
| if (current_cpu == "arm" || current_cpu == "arm64") { |
| asmflags = [] |
| if (arm_float_abi == "hard") { |
| asmflags += [ "-DHAVE_VFP_ARGS=1" ] |
| } else { |
| asmflags += [ "-DHAVE_VFP_ARGS=0" ] |
| } |
| } |
| } |
| |
| if (is_fuchsia || (is_posix && !is_mac)) { |
| defines += [ |
| "_ISOC99_SOURCE", |
| "_LARGEFILE_SOURCE", |
| ] |
| cflags += [ |
| "-std=c99", |
| "-pthread", |
| "-fno-math-errno", |
| "-fno-signed-zeros", |
| "-fno-tree-vectorize", |
| ] |
| ldflags = [ |
| "-L", |
| rebase_path(target_gen_dir, root_build_dir), |
| ] |
| if (!is_android && !is_fuchsia) { |
| # OS=android requires that both -lz and -lm occur after |
| # -lc++_shared on the link command line. Android link rules |
| # already include -lm, and we get -lz as a transitive dependency |
| # of libandroid.so, so simply moving both to the non-Android |
| # section solves the problem. |
| # |
| # The root cause of this problem is certain system libraries |
| # (libm starting with MNC and libz before MNC, among others) |
| # re-export the libgcc unwinder, and libc++ exports the |
| # libc++abi unwinder. As we build against libc++ headers, libc++ |
| # must be the first in the runtime symbol lookup order (among |
| # all unwinder-providing libraries). |
| |
| # librt for clock_gettime on precise |
| libs += [ |
| "m", |
| "z", |
| "rt", |
| ] |
| } |
| if (is_component_ffmpeg) { |
| # Export all symbols when building as component. |
| configs -= [ "//build/config/gcc:symbol_visibility_hidden" ] |
| configs += [ "//build/config/gcc:symbol_visibility_default" ] |
| } |
| } |
| if (is_mac) { |
| if (is_component_ffmpeg) { |
| # Export all symbols when building as component. |
| configs -= [ "//build/config/gcc:symbol_visibility_hidden" ] |
| configs += [ "//build/config/gcc:symbol_visibility_default" ] |
| } |
| |
| defines += [ "_DARWIN_C_SOURCE" ] |
| } else if (is_win) { |
| defines += [ |
| "_ISOC99_SOURCE", |
| "_LARGEFILE_SOURCE", |
| "HAVE_AV_CONFIG_H", |
| ] |
| |
| if (is_component_ffmpeg) { |
| # Required to avoid 4049 and 4217 errors around redundant imports. |
| cflags += [ |
| "/FIcompat/msvcrt/snprintf.h", |
| "/FIcompat/msvcrt/strtod.h", |
| ] |
| } |
| |
| # TODO(dalecurtis): We should fix these. http://crbug.com/154421 |
| cflags += [ |
| "/wd4996", # 'function': was declared deprecated |
| "/wd4018", # 'expression': signed/unsigned mismatch |
| "/wd4090", # 'operation' : different 'modifier' qualifiers |
| "/wd4305", # 'identifier': truncation from 'type1' to 'type2' |
| "/wd4133", # 'type' : incompatible types - from 'type1' to 'type2' |
| "/wd4146", # unary minus operator applied to unsigned type, result |
| # still unsigned |
| |
| "/wd4554", # 'operator' : check operator precedence for possible |
| # error; use parentheses to clarify precedence |
| |
| "/wd4028", # formal parameter 'number' different from declaration |
| "/wd4334", # 'operator' : result of 32-bit shift implicitly |
| # converted to 64 bits (was 64-bit shift intended?) |
| |
| "/wd4101", # 'identifier' : unreferenced local variable |
| "/wd4102", # 'label' : unreferenced label |
| "/wd4116", # unnamed type definition in parentheses |
| "/wd4307", # 'operator' : integral constant overflow |
| "/wd4273", # 'function' : inconsistent DLL linkage |
| "/wd4005", # 'identifier' : macro redefinition |
| "/wd4056", # overflow in floating point constant arithmetic |
| "/wd4756", # overflow in constant arithmetic |
| ] |
| if (current_cpu == "x64") { |
| # TODO(wolenetz): We should fix this. http://crbug.com/171009 |
| cflags += [ "/wd4267" ] # Conversion from size_t to 'type'. |
| } |
| } |
| |
| if (has_nasm_deps) { |
| deps += [ ":ffmpeg_nasm" ] |
| } |
| } |
| |
| if (is_component_ffmpeg) { |
| shared_library("ffmpeg") { |
| if (is_android) { |
| configs -= [ "//build/config/android:hide_all_but_jni_onload" ] |
| } |
| public_configs = [ ":ffmpeg_dependent_config" ] |
| deps = [ |
| ":ffmpeg_internal", |
| ] |
| |
| # So we can append below and assume they're defined. |
| ldflags = [] |
| |
| if (is_fuchsia || (is_posix && !is_mac)) { |
| # Fixes warnings PIC relocation when building as component. |
| ldflags += [ |
| "-Wl,-Bsymbolic", |
| "-L", |
| rebase_path(target_gen_dir, root_build_dir), |
| ] |
| } else if (is_win) { |
| # Windows component build needs the .def file to export ffmpeg symbols. |
| deps += [ ":ffmpeg_generate_def" ] |
| sources = [ |
| "$target_gen_dir/ffmpeg.def", |
| ] |
| } |
| |
| if (is_mac && !is_component_build) { |
| ldflags += [ "-Wl,-install_name,@rpath/libffmpeg.dylib" ] |
| } |
| } |
| } else { |
| source_set("ffmpeg") { |
| public_configs = [ ":ffmpeg_dependent_config" ] |
| deps = [ |
| ":ffmpeg_internal", |
| ] |
| } |
| } |