Adding third_party/openh264 build files for encoding

third_party/openh264/openh264.gyp

+# 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.
+
+{
+  'includes': [
+    'openh264_args.gypi',
+  ],
+  'conditions': [
+    ['use_openh264==1', {
+      # Settings shared by all openh264 targets.
+      'target_defaults': {
+        'variables': {
+          'chromium_code': 0,
+          'conditions': [
+            ['OS!="win"', {
+              # GCC flags
+              'openh264_cflags_add': [
+                '-Wno-macro-redefined',  # due to VERSION_NUMBER workaround
+                '-Wno-unused-value',
+              ],
+              'openh264_cflags_remove': [
+                '-Wheader-hygiene',
+              ],
+            },{
+              # Windows uses 'msvs_disabled_warnings' instead, for MSVC flags.
+              'openh264_cflags_add': [],
+              'openh264_cflags_remove': [],
+            }],
+          ],
+        },
+        'cflags': [ '<@(openh264_cflags_add)' ],
+        'cflags!': [ '<@(openh264_cflags_remove)' ],
+        'xcode_settings': {
+          'WARNING_CFLAGS': [ '<@(openh264_cflags_add)' ],
+          'WARNING_CFLAGS!': [ '<@(openh264_cflags_remove)' ],
+        },
+        'msvs_disabled_warnings': [
+          4005,  # macro redefinition - due to VERSION_NUMBER workaround
+          4324,  # structure was padded
+          4245,  # signed/unsigned mismatch
+          4701,  # uninitialized variable used
+          4702,  # unreachable code
+        ],
+
+        # Platform-specific defines.
+        'conditions': [
+          ['OS=="android"', {
+            'defines': [
+              'ANDROID_NDK',
+            ],
+          }],
+        ],
+
+        # Workaround relating to the VERSION_NUMBER macro in version.h.
+        # TODO(hbos): Fix cause of the issue instead of this workaround.
+        'defines': [
+          # On some builds VERSION_NUMBER is not defined when including
+          # version.h (probably another file is included named version.h, I have
+          # not been able to reproduce the problem on a local machine). Since
+          # the macro is only used for debug printing in wels[En/De]coderExt.cpp
+          # we can get around the undeclared identifier error by giving it a
+          # default value ourselves.
+          'VERSION_NUMBER="openh264 v.?.?"',
+        ],
+      },
+      'includes': [
+        'openh264.gypi',
+      ],
+      'targets': [
+        {
+          'target_name': 'openh264_common',
+          'type': 'static_library',
+          'conditions': [
+            ['OS=="android"', {
+              'dependencies': [
+                # 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.
+                '<(DEPTH)/build/android/ndk.gyp:cpu_features',
+              ],
+            }],
+          ],
+          'include_dirs': [ '<@(openh264_common_includes)' ],
+          'sources': [ '<@(openh264_common_sources)' ],
+        },
+        {
+          'target_name': 'openh264_processing',
+          'type': 'static_library',
+          'dependencies': [
+            'openh264_common',
+          ],
+          'include_dirs': [ '<@(openh264_processing_includes)' ],
+          'sources': [ '<@(openh264_processing_sources)' ],
+        },
+        {
+          'target_name': 'openh264_encoder',
+          'type': 'static_library',
+          'dependencies': [
+            'openh264_common',
+            'openh264_processing',
+          ],
+          'include_dirs': [ '<@(openh264_encoder_includes)' ],
+          'sources': [ '<@(openh264_encoder_sources)' ],
+        },
+        {
+          'target_name': 'openh264_decoder',
+          'type': 'static_library',
+          'dependencies': [
+            'openh264_common',
+            'openh264_processing',
+          ],
+          'defines': [
+            # Disables decoder_core.cpp debug prints.
+            'CODEC_FOR_TESTBED',
+          ],
+          'include_dirs': [ '<@(openh264_decoder_includes)' ],
+          'sources': [ '<@(openh264_decoder_sources)' ],
+        },
+      ],
+    },{
+      # Building without OpenH264. Defining a dummy target because every build
+      # file needs to have at least one target.
+      'targets': [
+        {
+          'target_name': 'openh264_dummy_target',
+          'type': 'none',
+        }
+      ],
+    }],
+  ],
+}