libtriple: improve debug architecture

every libtriple module can have its debug output enabled separately
by exporting the TRIPLE_DEBUG variable

libtriple/lt_debug.cpp

@@ -2,17 +2,74 @@
 
 #include <stdarg.h>
 #include <stdio.h>
+#include <stdlib.h>
 
-int cnxt_debug = 0;
+int cnxt_debug = 0; /* compat, unused */
 
-void lt_debug(const char *fmt, ...)
+int debuglevel = -1;
+
+static const char* lt_facility[] = {
+	"audio ",
+	"video ",
+	"demux ",
+	"record",
+	"play  ",
+	"power ",
+	"init  ",
+	"ca    ",
+	NULL
+};
+
+void _lt_info(int facility, const char *fmt, ...)
 {
-	if (! cnxt_debug)
-		return;
-
+	fprintf(stderr, "[libtriple:%s] ", lt_facility[facility]);
 	va_list args;
 	va_start(args, fmt);
 	vfprintf(stderr, fmt, args);
 	va_end(args);
 }
 
+
+void _lt_debug(int facility, const char *fmt, ...)
+{
+	if (debuglevel < 0)
+		fprintf(stderr, "lt_debug: debuglevel not initialized!\n");
+
+	if (! ((1 << facility) & debuglevel))
+		return;
+
+	fprintf(stderr, "[libtriple:%s] ", lt_facility[facility]);
+	va_list args;
+	va_start(args, fmt);
+	vfprintf(stderr, fmt, args);
+	va_end(args);
+}
+
+void lt_debug_init(void)
+{
+	int i = 0;
+	char *tmp = getenv("TRIPLE_DEBUG");
+	if (! tmp)
+		debuglevel = 0;
+	else
+		debuglevel = (int) strtol(tmp, NULL, 0);
+
+	if (debuglevel == 0)
+	{
+		fprintf(stderr, "libtriple debug options can be set by exporting TRIPLE_DEBUG.\n");
+		fprintf(stderr, "The following values (or bitwise OR combinations) are valid:\n");
+		while (lt_facility[i]) {
+			fprintf(stderr, "\tcomponent: %s  0x%02x\n", lt_facility[i], 1 << i);
+			i++;
+		}
+		fprintf(stderr, "\tall components:    0x%02x\n", (1 << i) - 1);
+	} else {
+		fprintf(stderr, "libtriple debug is active for the following components:\n");
+		while (lt_facility[i]) {
+			if (debuglevel & (1 << i))
+				fprintf(stderr, "%s ", lt_facility[i]);
+			i++;
+		}
+		fprintf(stderr, "\n");
+	}
+}