Implement logging for at3_standalone

ext/at3_standalone/compat.cpp

@@ -1,3 +1,25 @@
-#include "compat.h"
+#include <cstdarg>
+#include <cstdio>
 
-void av_log(int level, const char *fmt, ...) {}
+#include "compat.h"
+#include "Common/Log.h"
+
+void av_log(int level, const char *fmt, ...) {
+	char buffer[512];
+	va_list vl;
+	va_start(vl, fmt);
+	size_t retval = vsnprintf(buffer, sizeof(buffer), fmt, vl);
+	va_end(vl);
+
+	// lazy
+	switch (level) {
+	case AV_LOG_DEBUG:
+	case AV_LOG_TRACE:
+	case AV_LOG_VERBOSE: DEBUG_LOG(ME, "Atrac3/3+: %s", buffer); break;
+	case AV_LOG_ERROR: ERROR_LOG(ME, "Atrac3/3+: %s", buffer); break;
+	case AV_LOG_INFO: INFO_LOG(ME, "Atrac3/3+: %s", buffer); break;
+	case AV_LOG_WARNING:
+	default:
+		WARN_LOG(ME, "Atrac3/3+: %s", buffer); break;
+	}
+}