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juce_MidiBuffer.cpp
/*
==============================================================================
This file is part of the JUCE library.
Copyright (c) 2022 - Raw Material Software Limited
JUCE is an open source library subject to commercial or open-source
licensing.
The code included in this file is provided under the terms of the ISC license
http://www.isc.org/downloads/software-support-policy/isc-license. Permission
To use, copy, modify, and/or distribute this software for any purpose with or
without fee is hereby granted provided that the above copyright notice and
this permission notice appear in all copies.
JUCE IS PROVIDED "AS IS" WITHOUT ANY WARRANTY, AND ALL WARRANTIES, WHETHER
EXPRESSED OR IMPLIED, INCLUDING MERCHANTABILITY AND FITNESS FOR PURPOSE, ARE
DISCLAIMED.
==============================================================================
*/
namespace juce
{
namespace MidiBufferHelpers
{
inline int getEventTime (const void* d) noexcept
{
return readUnaligned<int32> (d);
}
inline uint16 getEventDataSize (const void* d) noexcept
{
return readUnaligned<uint16> (static_cast<const char*> (d) + sizeof (int32));
}
inline uint16 getEventTotalSize (const void* d) noexcept
{
return (uint16) (getEventDataSize (d) + sizeof (int32) + sizeof (uint16));
}
static int findActualEventLength (const uint8* data, int maxBytes) noexcept
{
auto byte = (unsigned int) *data;
if (byte == 0xf0 || byte == 0xf7)
{
int i = 1;
while (i < maxBytes)
if (data[i++] == 0xf7)
break;
return i;
}
if (byte == 0xff)
{
if (maxBytes == 1)
return 1;
const auto var = MidiMessage::readVariableLengthValue (data + 1, maxBytes - 1);
return jmin (maxBytes, var.value + 2 + var.bytesUsed);
}
if (byte >= 0x80)
return jmin (maxBytes, MidiMessage::getMessageLengthFromFirstByte ((uint8) byte));
return 0;
}
static uint8* findEventAfter (uint8* d, uint8* endData, int samplePosition) noexcept
{
while (d < endData && getEventTime (d) <= samplePosition)
d += getEventTotalSize (d);
return d;
}
}
//==============================================================================
MidiBufferIterator& MidiBufferIterator::operator++() noexcept
{
data += sizeof (int32) + sizeof (uint16) + size_t (MidiBufferHelpers::getEventDataSize (data));
return *this;
}
MidiBufferIterator MidiBufferIterator::operator++ (int) noexcept
{
auto copy = *this;
++(*this);
return copy;
}
MidiBufferIterator::reference MidiBufferIterator::operator*() const noexcept
{
return { data + sizeof (int32) + sizeof (uint16),
MidiBufferHelpers::getEventDataSize (data),
MidiBufferHelpers::getEventTime (data) };
}
//==============================================================================
MidiBuffer::MidiBuffer (const MidiMessage& message) noexcept
{
addEvent (message, 0);
}
void MidiBuffer::swapWith (MidiBuffer& other) noexcept { data.swapWith (other.data); }
void MidiBuffer::clear() noexcept { data.clearQuick(); }
void MidiBuffer::ensureSize (size_t minimumNumBytes) { data.ensureStorageAllocated ((int) minimumNumBytes); }
bool MidiBuffer::isEmpty() const noexcept { return data.size() == 0; }
void MidiBuffer::clear (int startSample, int numSamples)
{
auto start = MidiBufferHelpers::findEventAfter (data.begin(), data.end(), startSample - 1);
auto end = MidiBufferHelpers::findEventAfter (start, data.end(), startSample + numSamples - 1);
data.removeRange ((int) (start - data.begin()), (int) (end - start));
}
bool MidiBuffer::addEvent (const MidiMessage& m, int sampleNumber)
{
return addEvent (m.getRawData(), m.getRawDataSize(), sampleNumber);
}
bool MidiBuffer::addEvent (const void* newData, int maxBytes, int sampleNumber)
{
auto numBytes = MidiBufferHelpers::findActualEventLength (static_cast<const uint8*> (newData), maxBytes);
if (numBytes <= 0)
return true;
if (std::numeric_limits<uint16>::max() < numBytes)
{
// This method only supports messages smaller than (1 << 16) bytes
return false;
}
auto newItemSize = (size_t) numBytes + sizeof (int32) + sizeof (uint16);
auto offset = (int) (MidiBufferHelpers::findEventAfter (data.begin(), data.end(), sampleNumber) - data.begin());
data.insertMultiple (offset, 0, (int) newItemSize);
auto* d = data.begin() + offset;
writeUnaligned<int32> (d, sampleNumber);
d += sizeof (int32);
writeUnaligned<uint16> (d, static_cast<uint16> (numBytes));
d += sizeof (uint16);
memcpy (d, newData, (size_t) numBytes);
return true;
}
void MidiBuffer::addEvents (const MidiBuffer& otherBuffer,
int startSample, int numSamples, int sampleDeltaToAdd)
{
for (auto i = otherBuffer.findNextSamplePosition (startSample); i != otherBuffer.cend(); ++i)
{
const auto metadata = *i;
if (metadata.samplePosition >= startSample + numSamples && numSamples >= 0)
break;
addEvent (metadata.data, metadata.numBytes, metadata.samplePosition + sampleDeltaToAdd);
}
}
int MidiBuffer::getNumEvents() const noexcept
{
int n = 0;
auto end = data.end();
for (auto d = data.begin(); d < end; ++n)
d += MidiBufferHelpers::getEventTotalSize (d);
return n;
}
int MidiBuffer::getFirstEventTime() const noexcept
{
return data.size() > 0 ? MidiBufferHelpers::getEventTime (data.begin()) : 0;
}
int MidiBuffer::getLastEventTime() const noexcept
{
if (data.size() == 0)
return 0;
auto endData = data.end();
for (auto d = data.begin();;)
{
auto nextOne = d + MidiBufferHelpers::getEventTotalSize (d);
if (nextOne >= endData)
return MidiBufferHelpers::getEventTime (d);
d = nextOne;
}
}
MidiBufferIterator MidiBuffer::findNextSamplePosition (int samplePosition) const noexcept
{
return std::find_if (cbegin(), cend(), [&] (const MidiMessageMetadata& metadata) noexcept
{
return metadata.samplePosition >= samplePosition;
});
}
//==============================================================================
JUCE_BEGIN_IGNORE_WARNINGS_GCC_LIKE ("-Wdeprecated-declarations")
JUCE_BEGIN_IGNORE_WARNINGS_MSVC (4996)
MidiBuffer::Iterator::Iterator (const MidiBuffer& b) noexcept
: buffer (b), iterator (b.data.begin())
{
}
void MidiBuffer::Iterator::setNextSamplePosition (int samplePosition) noexcept
{
iterator = buffer.findNextSamplePosition (samplePosition);
}
bool MidiBuffer::Iterator::getNextEvent (const uint8*& midiData, int& numBytes, int& samplePosition) noexcept
{
if (iterator == buffer.cend())
return false;
const auto metadata = *iterator++;
midiData = metadata.data;
numBytes = metadata.numBytes;
samplePosition = metadata.samplePosition;
return true;
}
bool MidiBuffer::Iterator::getNextEvent (MidiMessage& result, int& samplePosition) noexcept
{
if (iterator == buffer.cend())
return false;
const auto metadata = *iterator++;
result = metadata.getMessage();
samplePosition = metadata.samplePosition;
return true;
}
JUCE_END_IGNORE_WARNINGS_MSVC
JUCE_END_IGNORE_WARNINGS_GCC_LIKE
//==============================================================================
//==============================================================================
#if JUCE_UNIT_TESTS
struct MidiBufferTest final : public UnitTest
{
MidiBufferTest()
: UnitTest ("MidiBuffer", UnitTestCategories::midi)
{}
void runTest() override
{
beginTest ("Clear messages");
{
const auto message = MidiMessage::noteOn (1, 64, 0.5f);
const auto testBuffer = [&]
{
MidiBuffer buffer;
buffer.addEvent (message, 0);
buffer.addEvent (message, 10);
buffer.addEvent (message, 20);
buffer.addEvent (message, 30);
return buffer;
}();
{
auto buffer = testBuffer;
buffer.clear (10, 0);
expectEquals (buffer.getNumEvents(), 4);
}
{
auto buffer = testBuffer;
buffer.clear (10, 1);
expectEquals (buffer.getNumEvents(), 3);
}
{
auto buffer = testBuffer;
buffer.clear (10, 10);
expectEquals (buffer.getNumEvents(), 3);
}
{
auto buffer = testBuffer;
buffer.clear (10, 20);
expectEquals (buffer.getNumEvents(), 2);
}
{
auto buffer = testBuffer;
buffer.clear (10, 30);
expectEquals (buffer.getNumEvents(), 1);
}
{
auto buffer = testBuffer;
buffer.clear (10, 300);
expectEquals (buffer.getNumEvents(), 1);
}
}
}
};
static MidiBufferTest midiBufferTest;
#endif
} // namespace juce
juce::MidiBufferIterator
Definition juce_MidiBuffer.h:79
juce::MidiBufferIterator::operator++
MidiBufferIterator & operator++() noexcept
Definition juce_MidiBuffer.cpp:83
juce::MidiBufferIterator::operator*
reference operator*() const noexcept
Definition juce_MidiBuffer.cpp:96
juce::MidiBuffer::Iterator::Iterator
Iterator(const MidiBuffer &b) noexcept
Definition juce_MidiBuffer.cpp:215
juce::MidiBuffer::Iterator::setNextSamplePosition
void setNextSamplePosition(int samplePosition) noexcept
Definition juce_MidiBuffer.cpp:220
juce::MidiBuffer::Iterator::getNextEvent
bool getNextEvent(MidiMessage &result, int &samplePosition) noexcept
Definition juce_MidiBuffer.cpp:237
juce::MidiBuffer
Definition juce_MidiBuffer.h:145
juce::MidiBuffer::getFirstEventTime
int getFirstEventTime() const noexcept
Definition juce_MidiBuffer.cpp:180
juce::MidiBuffer::getLastEventTime
int getLastEventTime() const noexcept
Definition juce_MidiBuffer.cpp:185
juce::MidiBuffer::ensureSize
void ensureSize(size_t minimumNumBytes)
Definition juce_MidiBuffer.cpp:111
juce::MidiBuffer::getNumEvents
int getNumEvents() const noexcept
Definition juce_MidiBuffer.cpp:169
juce::MidiBuffer::cbegin
MidiBufferIterator cbegin() const noexcept
Definition juce_MidiBuffer.h:265
juce::MidiBuffer::findNextSamplePosition
MidiBufferIterator findNextSamplePosition(int samplePosition) const noexcept
Definition juce_MidiBuffer.cpp:203
juce::MidiBuffer::cend
MidiBufferIterator cend() const noexcept
Definition juce_MidiBuffer.h:268
juce::MidiBuffer::isEmpty
bool isEmpty() const noexcept
Definition juce_MidiBuffer.cpp:112
juce::MidiBuffer::swapWith
void swapWith(MidiBuffer &) noexcept
Definition juce_MidiBuffer.cpp:109
juce::MidiBuffer::addEvent
bool addEvent(const MidiMessage &midiMessage, int sampleNumber)
Definition juce_MidiBuffer.cpp:122
juce::MidiBuffer::MidiBuffer
MidiBuffer() noexcept=default
juce::MidiBuffer::clear
void clear() noexcept
Definition juce_MidiBuffer.cpp:110
juce::MidiBuffer::addEvents
void addEvents(const MidiBuffer &otherBuffer, int startSample, int numSamples, int sampleDeltaToAdd)
Definition juce_MidiBuffer.cpp:155
juce::MidiBuffer::data
Array< uint8 > data
Definition juce_MidiBuffer.h:339
juce::MidiBuffer::begin
MidiBufferIterator begin() const noexcept
Definition juce_MidiBuffer.h:259
juce::MidiBuffer::end
MidiBufferIterator end() const noexcept
Definition juce_MidiBuffer.h:262
juce::MidiMessage
Definition juce_MidiMessage.h:35
juce::MidiMessage::getRawData
const uint8 * getRawData() const noexcept
Definition juce_MidiMessage.h:134
juce::MidiMessage::noteOn
static MidiMessage noteOn(int channel, int noteNumber, float velocity) noexcept
Definition juce_MidiMessage.cpp:604
juce::MidiMessage::getMessageLengthFromFirstByte
static int getMessageLengthFromFirstByte(uint8 firstByte) noexcept
Definition juce_MidiMessage.cpp:104
juce::MidiMessage::readVariableLengthValue
static VariableLengthValue readVariableLengthValue(const uint8 *data, int maxBytesToUse) noexcept
Definition juce_MidiMessage.cpp:60
juce::MidiMessage::getRawDataSize
int getRawDataSize() const noexcept
Definition juce_MidiMessage.h:139
juce::UnitTest
Definition juce_UnitTest.h:70
juce::MidiMessageMetadata
Definition juce_MidiBuffer.h:37
juce::MidiMessageMetadata::samplePosition
int samplePosition
Definition juce_MidiBuffer.h:58