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-rw-r--r--dom/midi/MIDILog.cpp46
1 files changed, 46 insertions, 0 deletions
diff --git a/dom/midi/MIDILog.cpp b/dom/midi/MIDILog.cpp
new file mode 100644
index 0000000000..cc9945ed58
--- /dev/null
+++ b/dom/midi/MIDILog.cpp
@@ -0,0 +1,46 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "MIDILog.h"
+
+#include "mozilla/dom/MIDITypes.h"
+#include "mozilla/dom/MIDIPortBinding.h"
+
+mozilla::LazyLogModule gWebMIDILog("WebMIDI");
+
+void LogMIDIMessage(const mozilla::dom::MIDIMessage& aMessage,
+ const nsAString& aPortId,
+ mozilla::dom::MIDIPortType aDirection) {
+ if (MOZ_LOG_TEST(gWebMIDILog, mozilla::LogLevel::Debug)) {
+ if (MOZ_LOG_TEST(gWebMIDILog, mozilla::LogLevel::Verbose)) {
+ uint32_t byteCount = aMessage.data().Length();
+ nsAutoCString logMessage;
+ // Log long messages inline with the timestamp and the length, log
+ // longer messages a bit like xxd
+ logMessage.AppendPrintf(
+ "%s %s length=%u", NS_ConvertUTF16toUTF8(aPortId).get(),
+ aDirection == mozilla::dom::MIDIPortType::Input ? "->" : "<-",
+ byteCount);
+
+ if (byteCount <= 3) {
+ logMessage.AppendPrintf(" [");
+ // Regular messages
+ for (uint32_t i = 0; i < byteCount - 1; i++) {
+ logMessage.AppendPrintf("%x ", aMessage.data()[i]);
+ }
+ logMessage.AppendPrintf("%x]", aMessage.data()[byteCount - 1]);
+ } else {
+ // Longer messages
+ for (uint32_t i = 0; i < byteCount; i++) {
+ if (!(i % 8)) {
+ logMessage.AppendPrintf("\n%08u:\t", i);
+ }
+ logMessage.AppendPrintf("%x ", aMessage.data()[i]);
+ }
+ }
+ MOZ_LOG(gWebMIDILog, mozilla::LogLevel::Verbose,
+ ("%s", logMessage.get()));
+ }
+ }
+}