H.264 video codec support using OpenH264/FFmpeg

webrtc/video/loopback.cc

Index: webrtc/video/loopback.cc
diff --git a/webrtc/video/loopback.cc b/webrtc/video/loopback.cc
index 9083500c1e6a3a80583812f32a97c99e320595b2..eef8d9e5cbc2c09a524c3916f9a2f203a87d7b44 100644
--- a/webrtc/video/loopback.cc
+++ b/webrtc/video/loopback.cc
@@ -43,6 +43,7 @@ static const uint32_t kSendRtxSsrc = 0x654322;
 static const uint32_t kReceiverLocalSsrc = 0x123456;
 
 static const uint8_t kRtxVideoPayloadType = 96;
+static const uint8_t kVideoPayloadTypeH264 = 120;  // TODO(hbos): What value to use for H264?
 static const uint8_t kVideoPayloadTypeVP8 = 124;
 static const uint8_t kVideoPayloadTypeVP9 = 125;
 
@@ -98,17 +99,21 @@ void Loopback::Run() {
 
   send_config.local_renderer = local_preview.get();
   rtc::scoped_ptr<VideoEncoder> encoder;
-  if (config_.codec == "VP8") {
+  int payload_type;
+  if (config_.codec == "H264") {
+    encoder.reset(VideoEncoder::Create(VideoEncoder::kH264));
+    payload_type = kVideoPayloadTypeH264;
+  } else if (config_.codec == "VP8") {
     encoder.reset(VideoEncoder::Create(VideoEncoder::kVp8));
+    payload_type = kVideoPayloadTypeVP8;
   } else if (config_.codec == "VP9") {
     encoder.reset(VideoEncoder::Create(VideoEncoder::kVp9));
+    payload_type = kVideoPayloadTypeVP9;
   } else {
     // Codec not supported.
     RTC_NOTREACHED() << "Codec not supported!";
     return;
   }
-  const int payload_type =
-      config_.codec == "VP8" ? kVideoPayloadTypeVP8 : kVideoPayloadTypeVP9;
   send_config.encoder_settings.encoder = encoder.get();
   send_config.encoder_settings.payload_name = config_.codec;
   send_config.encoder_settings.payload_type = payload_type;