Oy, after all that difficult 6 hours of labor
Sherman came along and told me he had a dream last night in which an easier way came to him. Bless his heart. Let me explain. The basic dilemma was that the file name for the demuxed audio cannot be created with the metadata until we actually receive a THD frame carrying the metadata (PID, rate, channels, delay and all that nonsense). But we were getting an embedded AC3 frame first, so we had nowhere to write it because the output file was not yet created (waiting for the first THD frame to have the metadata). My stupid fix was to save off the embedded AC3 frame(s) and then write them out first when the first THD frame is received and the file gets opened. It works but requires lots of icky memory management for the save buffer(s).
Sherman said why not just go ahead and open the output file when the embedded AC3 frame arrives but with a generic name containing only the PID. Then when the file is closed rename it as needed (with metadata). I implemented that and it works just fine. Children these days!
