Adding third_party/openh264 build files for encoding

third_party/openh264/BUILD.gn

Index: third_party/openh264/BUILD.gn
diff --git a/third_party/openh264/BUILD.gn b/third_party/openh264/BUILD.gn
new file mode 100644
index 0000000000000000000000000000000000000000..e522ce06136992ce81d6ec5e671dbe14f76dde89
--- /dev/null
+++ b/third_party/openh264/BUILD.gn
@@ -0,0 +1,91 @@
+# Copyright 2015 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("//third_party/openh264/openh264_args.gni")
+
+if (use_openh264) {

[brettw, 2015/11/25 19:26:34]

As-is, this is unnecessary because this file will only be loaded when people
refer to targets in it, and when this isn't defined, there are no targets.

You can remove this and replace it with:
  assert(use_openh264)
to catch some common mistakes.

[hbos_chromium, 2015/11/26 12:19:24]

Done.

+  # Import source and include variables from openh264.gypi.
+  openh264_gypi_values = exec_script("//build/gypi_to_gn.py",
+                                     [ rebase_path("openh264.gypi") ],
+                                     "scope")
+
+  # Config shared by all openh264 targets.
+  config("openh264_config") {
+    cflags = []
+    defines = []
+
+    # Compiler warnings to ignore.
+    if (!is_win) {
+      # GCC flags
+      cflags += [
+        "-Wno-header-hygiene",
+        "-Wno-unused-value",
+      ]
+    }
+
+    # Platform-specific defines.
+    if (is_android) {
+      # Android NDK is necessary for its cpufeatures and this define is what
+      # OpenH264 code uses to check if it should be used.
+      defines += [ "ANDROID_NDK" ]
+    }
+  }
+
+  source_set("openh264_common") {
+    sources = openh264_gypi_values.openh264_common_sources
+    include_dirs = openh264_gypi_values.openh264_common_includes
+    configs -= [ "//build/config/compiler:chromium_code" ]
+    configs += [ "//build/config/compiler:no_chromium_code" ]
+    configs += [ ":openh264_config" ]
+    deps = []
+    if (is_android) {
+      deps += [
+        # Defines "android_get/setCpu..." functions. The original OpenH264 build
+        # files replaces these using macros for "wels_..." versions of the same
+        # functions. We do not have access to these and use the <cpu-features.h>
+        # ones instead.
+        "//third_party/android_tools:cpu_features",
+      ]
+    }
+  }
+
+  source_set("openh264_processing") {
+    sources = openh264_gypi_values.openh264_processing_sources
+    include_dirs = openh264_gypi_values.openh264_processing_includes
+    configs -= [ "//build/config/compiler:chromium_code" ]
+    configs += [ "//build/config/compiler:no_chromium_code" ]
+    configs += [ ":openh264_config" ]
+    deps = [
+      ":openh264_common",
+    ]
+  }
+
+  source_set("openh264_encoder") {
+    sources = openh264_gypi_values.openh264_encoder_sources
+    include_dirs = openh264_gypi_values.openh264_encoder_includes
+    configs -= [ "//build/config/compiler:chromium_code" ]
+    configs += [ "//build/config/compiler:no_chromium_code" ]
+    configs += [ ":openh264_config" ]
+    deps = [
+      ":openh264_common",
+      ":openh264_processing",
+    ]
+  }
+
+  source_set("openh264_decoder") {
+    sources = openh264_gypi_values.openh264_decoder_sources
+    include_dirs = openh264_gypi_values.openh264_decoder_includes
+    configs -= [ "//build/config/compiler:chromium_code" ]
+    configs += [ "//build/config/compiler:no_chromium_code" ]
+    configs += [ ":openh264_config" ]
+    deps = [
+      ":openh264_common",
+      ":openh264_processing",
+    ]
+    defines = [
+      # Disables decoder_core.cpp debug prints.
+      "CODEC_FOR_TESTBED",
+    ]
+  }
+}