H.264 video codec support using OpenH264/FFmpeg

webrtc/build/common.gypi

Index: webrtc/build/common.gypi
diff --git a/webrtc/build/common.gypi b/webrtc/build/common.gypi
index 5caa6cc10c84d8d0206ba667606b1ad3dd7dfbf1..c656307bd66e847bd5fe17f4791fc23f2dbf7b48 100644
--- a/webrtc/build/common.gypi
+++ b/webrtc/build/common.gypi
@@ -125,9 +125,14 @@
     '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
@@ -342,6 +347,11 @@
           'WEBRTC_OBJC_H264',
         ],
       }],
+      ['use_openh264==1', {
+        'defines': [
+          'WEBRTC_OPENH264',
+        ],
+      }],
       ['OS=="linux"', {
         'defines': [
           'WEBRTC_LINUX',