Mpeg: Initialize esBuffer to safer values.

Makes the audio work properly in Dan Ball Senki W (#4786.)

Core/HLE/sceMpeg.cpp

@@ -1320,15 +1320,19 @@ static int sceMpegInitAu(u32 mpeg, u32 bufferAddr, u32 auPointer)
 
 	if (bufferAddr >= 1 && bufferAddr <= (u32)MPEG_DATA_ES_BUFFERS && ctx->esBuffers[bufferAddr - 1]) {
 		// This esbuffer has been allocated for Avc.
-		sceAu.esBuffer = bufferAddr;   // Can this be right??? not much of a buffer pointer..
+		// Default to 0, since we stuff the stream id in here.  Technically, we shouldn't.
+		// TODO: Do something better to track the AU data.  This used to be bufferAddr.
+		sceAu.esBuffer = 0;
 		sceAu.esSize = MPEG_AVC_ES_SIZE;
 		sceAu.dts = 0;
 		sceAu.pts = 0;
 
 		sceAu.write(auPointer);
 	} else {
 		// This esbuffer has been left as Atrac.
-		sceAu.esBuffer = bufferAddr;
+		// Default to 0, since we stuff the stream id in here.  Technically, we shouldn't.
+		// TODO: Do something better to track the AU data.  This used to be bufferAddr.
+		sceAu.esBuffer = 0;
 		sceAu.esSize = MPEG_ATRAC_ES_SIZE;
 		sceAu.pts = 0;
 		sceAu.dts = UNKNOWN_TIMESTAMP;