dom/midi/MIDILog.cpp

   1 /* This Source Code Form is subject to the terms of the Mozilla Public
   2  * License, v. 2.0. If a copy of the MPL was not distributed with this file,
   3  * You can obtain one at http://mozilla.org/MPL/2.0/. */
   4
   5 #include "MIDILog.h"
   6
   7 #include "mozilla/dom/MIDITypes.h"
   8 #include "mozilla/dom/MIDIPortBinding.h"
   9
  10 mozilla::LazyLogModule gWebMIDILog("WebMIDI");
  11
  12 void LogMIDIMessage(const mozilla::dom::MIDIMessage& aMessage,
  13                     const nsAString& aPortId,
  14                     mozilla::dom::MIDIPortType aDirection) {
  15   if (MOZ_LOG_TEST(gWebMIDILog, mozilla::LogLevel::Debug)) {
  16     if (MOZ_LOG_TEST(gWebMIDILog, mozilla::LogLevel::Verbose)) {
  17       uint32_t byteCount = aMessage.data().Length();
  18       nsAutoCString logMessage;
  19       // Log long messages inline with the timestamp and the length, log
  20       // longer messages a bit like xxd
  21       logMessage.AppendPrintf(
  22           "%s %s length=%u", NS_ConvertUTF16toUTF8(aPortId).get(),
  23           aDirection == mozilla::dom::MIDIPortType::Input ? "->" : "<-",
  24           byteCount);
  25
  26       if (byteCount <= 3) {
  27         logMessage.AppendPrintf(" [");
  28         // Regular messages
  29         for (uint32_t i = 0; i < byteCount - 1; i++) {
  30           logMessage.AppendPrintf("%x ", aMessage.data()[i]);
  31         }
  32         logMessage.AppendPrintf("%x]", aMessage.data()[byteCount - 1]);
  33       } else {
  34         // Longer messages
  35         for (uint32_t i = 0; i < byteCount; i++) {
  36           if (!(i % 8)) {
  37             logMessage.AppendPrintf("\n%08u:\t", i);
  38           }
  39           logMessage.AppendPrintf("%x ", aMessage.data()[i]);
  40         }
  41       }
  42       MOZ_LOG(gWebMIDILog, mozilla::LogLevel::Verbose,
  43               ("%s", logMessage.get()));
  44     }
  45   }
  46 }