H.264 video codec support using OpenH264/FFmpeg

webrtc/build/common.gypi

 # Copyright (c) 2012 The WebRTC project authors. All Rights Reserved.
 #
 # Use of this source code is governed by a BSD-style license
 # that can be found in the LICENSE file in the root of the source
 # tree. An additional intellectual property rights grant can be found
 # in the file PATENTS.  All contributing project authors may
 # be found in the AUTHORS file in the root of the source tree.
 
 # This file contains common settings for building WebRTC components.
 
@@ skipping 107 matching lines @@
 
     # Defer ssl perference to that specified through sslconfig.h instead of
     # choosing openssl or nss directly.  In practice, this can be used to
     # enable schannel on windows.
     'use_legacy_ssl_defaults%': 0,
 
     # Determines whether NEON code will be built.
     'build_with_neon%': 0,
 
     # Enable this to use HW H.264 encoder/decoder on iOS/Mac PeerConnections.
-    # Enabling this may break interop with Android clients that support H264.
+    # Enabling this may break interop with Android clients that support H.264.
     'use_objc_h264%': 0,
 
+    # Enable this to build OpenH264 SW H.264 encoder/decoder.
+    # CHECK THE OPENH264 LICENCE BEFORE BUILDING, YOU MAY LIABLE TO PAY
+    # LICENSING.
+    'use_openh264%': 0,
+
     'conditions': [
       ['build_with_chromium==1', {
         # Exclude pulse audio on Chromium since its prerequisites don't require
         # pulse audio.
         'include_pulse_audio%': 0,
 
         # Exclude internal ADM since Chromium uses its own IO handling.
         'include_internal_audio_device%': 0,
       }, {  # Settings for the standalone (not-in-Chromium) build.
         # TODO(andrew): For now, disable the Chrome plugins, which causes a
@@ skipping 194 matching lines @@
         'defines': [
           'WEBRTC_MAC',
           'WEBRTC_IOS',
         ],
       }],
       ['OS=="ios" and use_objc_h264==1', {
         'defines': [
           'WEBRTC_OBJC_H264',
         ],
       }],
+      ['use_openh264==1', {
+        'defines': [
+          'WEBRTC_OPENH264',
+        ],
+      }],
       ['OS=="linux"', {
         'defines': [
           'WEBRTC_LINUX',
         ],
       }],
       ['OS=="mac"', {
         'defines': [
           'WEBRTC_MAC',
         ],
       }],
@@ skipping 91 matching lines @@
           # of a more specific macro.
           'defines': [
             'WEBRTC_POSIX',
           ],
         }],
       ],
     },
   }, # target_defaults
 }