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 dfa52f2cbdde71ec50fd67d43dee5c7e4ef9d7f8..e467bac42231e5bc08a403ff46e2ec69fe17daa1 100644
--- a/webrtc/build/common.gypi
+++ b/webrtc/build/common.gypi
@@ -120,9 +120,20 @@
     '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 H.264 encoder/decoder using third party libraries.
+    # Encoding uses OpenH264 and decoding uses FFmpeg. Because of this, OpenH264
+    # and FFmpeg have to be correctly enabled separately.
+    # - 'use_openh264=1' is required for OpenH264 targets to be defined.
+    # - 'ffmpeg_branding=Chrome' is one way to support H.264 decoding in FFmpeg.
+    #   FFmpeg can be built with/without H.264 support, see 'ffmpeg_branding'.
+    #   Without it, it compiles but H264DecoderImpl fails to initialize.
+    # CHECK THE OPENH264, FFMPEG AND H.264 LICENSES/PATENTS BEFORE BUILDING.
+    # http://www.openh264.org, https://www.ffmpeg.org/
+    'use_third_party_h264%': 0,
+
     'conditions': [
       ['build_with_chromium==1', {
         # Exclude pulse audio on Chromium since its prerequisites don't require
@@ -335,6 +346,11 @@
           'WEBRTC_OBJC_H264',
         ],
       }],
+      ['use_third_party_h264==1', {
+        'defines': [
+          'WEBRTC_THIRD_PARTY_H264',
+        ],
+      }],
       ['OS=="linux"', {
         'defines': [
           'WEBRTC_LINUX',