26namespace MidiFileHelpers
28 static void writeVariableLengthInt (OutputStream& out, uint32 v)
30 auto buffer = v & 0x7f;
32 while ((v >>= 7) != 0)
35 buffer |= ((v & 0x7f) | 0x80);
40 out.writeByte ((
char) buffer);
49 static bool parseMidiHeader (
const uint8* &data,
short& timeFormat,
short& fileType,
short& numberOfTracks)
noexcept
60 for (
int i = 0; i < 8; ++i)
86 data += bytesRemaining;
91 static double convertTicksToSeconds (
double time,
92 const MidiMessageSequence& tempoEvents,
96 return time / (-(timeFormat >> 8) * (timeFormat & 0xff));
98 double lastTime = 0, correctedTime = 0;
99 auto tickLen = 1.0 / (timeFormat & 0x7fff);
100 auto secsPerTick = 0.5 * tickLen;
101 auto numEvents = tempoEvents.getNumEvents();
103 for (
int i = 0; i < numEvents; ++i)
105 auto& m = tempoEvents.getEventPointer(i)->message;
106 auto eventTime = m.getTimeStamp();
108 if (eventTime >= time)
111 correctedTime += (eventTime - lastTime) * secsPerTick;
112 lastTime = eventTime;
114 if (m.isTempoMetaEvent())
115 secsPerTick = tickLen * m.getTempoSecondsPerQuarterNote();
117 while (i + 1 < numEvents)
119 auto& m2 = tempoEvents.getEventPointer(i + 1)->message;
121 if (m2.getTimeStamp() != eventTime)
124 if (m2.isTempoMetaEvent())
125 secsPerTick = tickLen * m2.getTempoSecondsPerQuarterNote();
131 return correctedTime + (time - lastTime) * secsPerTick;
134 template <
typename MethodType>
135 static void findAllMatchingEvents (
const OwnedArray<MidiMessageSequence>& tracks,
136 MidiMessageSequence& results,
139 for (
auto* track : tracks)
141 auto numEvents = track->getNumEvents();
143 for (
int j = 0; j < numEvents; ++j)
145 auto& m = track->getEventPointer(j)->message;
148 results.addEvent (m);
160 tracks.addCopiesOf (
other.tracks);
166 tracks.addCopiesOf (
other.tracks);
167 timeFormat =
other.timeFormat;
172 : tracks (std::move (
other.tracks)),
173 timeFormat (
other.timeFormat)
179 tracks = std::move (
other.tracks);
180 timeFormat =
other.timeFormat;
192 return tracks.
size();
197 return tracks[index];
241 for (
auto*
ms : tracks)
242 t = jmax (
t,
ms->getEndTime());
259 auto d =
static_cast<const uint8*
> (data.
getData());
264 size -= (
size_t) (d -
static_cast<const uint8*
> (data.
getData()));
274 if (chunkSize <= 0 || (
size_t) chunkSize > size)
283 size -= (
size_t) chunkSize + 8;
327 std::stable_sort (result.list.
begin(), result.list.
end(),
328 [] (
const MidiMessageSequence::MidiEventHolder* a,
329 const MidiMessageSequence::MidiEventHolder* b)
331 auto t1 = a->message.getTimeStamp();
332 auto t2 = b->message.getTimeStamp();
334 if (t1 < t2) return true;
335 if (t2 < t1) return false;
337 return a->message.isNoteOff() && b->message.isNoteOn();
342 if (createMatchingNoteOffs)
343 tracks.getLast()->updateMatchedPairs();
355 for (
auto*
ms : tracks)
357 for (
int j =
ms->getNumEvents(); --
j >= 0;)
359 auto& m =
ms->getEventPointer(
j)->message;
360 m.setTimeStamp (MidiFileHelpers::convertTicksToSeconds (m.getTimeStamp(),
tempoEvents, timeFormat));
372 if (!
out.writeIntBigEndian (6))
return false;
374 if (!
out.writeShortBigEndian ((
short) tracks.size()))
return false;
375 if (!
out.writeShortBigEndian (timeFormat))
return false;
377 for (
auto*
ms : tracks)
378 if (! writeTrack (
out, *
ms))
393 for (
int i = 0; i <
ms.getNumEvents(); ++i)
395 auto&
mm =
ms.getEventPointer(i)->message;
397 if (
mm.isEndOfTrackMetaEvent())
400 auto tick = roundToInt (
mm.getTimeStamp());
402 MidiFileHelpers::writeVariableLengthInt (
out, (uint32)
delta);
405 auto* data =
mm.getRawData();
406 auto dataSize =
mm.getRawDataSize();
417 else if (statusByte == 0xf0)
424 MidiFileHelpers::writeVariableLengthInt (out, (uint32) dataSize);
427 out.
write (data, (
size_t) dataSize);
428 lastStatusByte = statusByte;
431 if (! endOfTrackEventWritten)
435 out.
write (m.getRawData(), (
size_t) m.getRawDataSize());
int size() const noexcept
ElementType * begin() noexcept
ElementType * end() noexcept
void add(const ElementType &newElement)
static JUCE_CONSTEXPR uint16 bigEndianShort(const void *bytes) noexcept
static JUCE_CONSTEXPR uint32 bigEndianInt(const void *bytes) noexcept
void * getData() noexcept
size_t getSize() const noexcept
size_t getDataSize() const noexcept
bool write(const void *, size_t) override
void convertTimestampTicksToSeconds()
void addTrack(const MidiMessageSequence &trackSequence)
void setTicksPerQuarterNote(int ticksPerQuarterNote) noexcept
int getNumTracks() const noexcept
short getTimeFormat() const noexcept
void setSmpteTimeFormat(int framesPerSecond, int subframeResolution) noexcept
double getLastTimestamp() const
bool readFrom(InputStream &sourceStream, bool createMatchingNoteOffs=true)
MidiFile & operator=(const MidiFile &)
void findAllTimeSigEvents(MidiMessageSequence &timeSigEvents) const
void findAllKeySigEvents(MidiMessageSequence &keySigEvents) const
void findAllTempoEvents(MidiMessageSequence &tempoChangeEvents) const
const MidiMessageSequence * getTrack(int index) const noexcept
bool writeTo(OutputStream &destStream, int midiFileType=1) const
MidiEventHolder * addEvent(const MidiMessage &newMessage, double timeAdjustment=0)
static int readVariableLengthVal(const uint8 *data, int &numBytesUsed) noexcept
bool isKeySignatureMetaEvent() const noexcept
bool isTimeSignatureMetaEvent() const noexcept
bool isTempoMetaEvent() const noexcept
static MidiMessage endOfTrack() noexcept
virtual bool writeByte(char byte)
virtual bool writeIntBigEndian(int value)