Add FlexfecReceiveStream.

webrtc/config.h

Index: webrtc/config.h
diff --git a/webrtc/config.h b/webrtc/config.h
index a6778715d87f634692a63b59aac64d3010ec73c6..8e4912cbcde03a3d907eb283160e16219af03a89 100644
--- a/webrtc/config.h
+++ b/webrtc/config.h
@@ -16,6 +16,7 @@
 #include <string>
 #include <vector>
 
+#include "webrtc/base/basictypes.h"
 #include "webrtc/base/optional.h"
 #include "webrtc/base/refcount.h"
 #include "webrtc/base/scoped_ref_ptr.h"
@@ -53,6 +54,23 @@ struct UlpfecConfig {
   int red_rtx_payload_type;
 };
 
+// Settings for FlexFEC forward error correction.
+// Set the payload type to '-1' to disable.
+struct FlexfecConfig {
+  FlexfecConfig()
+      : flexfec_payload_type(-1), flexfec_ssrc(0), protected_media_ssrc(0) {}
+  std::string ToString() const;
+
+  // Payload type of FlexFEC.
+  int flexfec_payload_type;
+
+  // SSRC of FlexFEC stream.
+  uint32_t flexfec_ssrc;
+
+  // SSRC of the single media stream that is protected.
+  uint32_t protected_media_ssrc;

[stefan-webrtc, 2016/10/17 17:56:04]

Should we make this a vector already now to avoid having to change the API
later?

[brandtr, 2016/10/18 14:31:18]

Yes, that seems like a good idea. Done.

+};
+
 // RTP header extension, see RFC 5285.
 struct RtpExtension {
   RtpExtension() : id(0) {}