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ARAPlaybackRegionReader Class Reference

Subclass of AudioFormatReader that reads samples from a group of playback regions. More...

#include <juce_ARAAudioReaders.h>

Inheritance diagram for ARAPlaybackRegionReader:

Public Member Functions

 ARAPlaybackRegionReader (ARAPlaybackRegion *playbackRegion)
 Create an ARAPlaybackRegionReader instance to read the given playbackRegion, using the sample rate and channel count of the underlying ARAAudioSource.
 
 ARAPlaybackRegionReader (double sampleRate, int numChannels, const std::vector< ARAPlaybackRegion * > &playbackRegions)
 Create an ARAPlaybackRegionReader instance to read the given playbackRegions.
 
 ~ARAPlaybackRegionReader () override
 
bool isValid () const
 Returns true as long as any of the reader's underlying playback region's haven't changed.
 
void invalidate ()
 Invalidate the reader - this should be called if the sample content of any of the reader's ARAPlaybackRegions changes.
 
bool readSamples (int *const *destSamples, int numDestChannels, int startOffsetInDestBuffer, int64 startSampleInFile, int numSamples) override
 Subclasses must implement this method to perform the low-level read operation.
 
void willUpdatePlaybackRegionProperties (ARAPlaybackRegion *playbackRegion, ARAPlaybackRegion::PropertiesPtr newProperties) override
 Called before the playback region's properties are updated.
 
void didUpdatePlaybackRegionContent (ARAPlaybackRegion *playbackRegion, ARAContentUpdateScopes scopeFlags) override
 Called when the playback region's content (i.e.
 
void willDestroyPlaybackRegion (ARAPlaybackRegion *playbackRegion) override
 Called before the playback region is destroyed.
 
- Public Member Functions inherited from AudioFormatReader
virtual ~AudioFormatReader ()
 Destructor.
 
const StringgetFormatName () const noexcept
 Returns a description of what type of format this is.
 
bool read (float *const *destChannels, int numDestChannels, int64 startSampleInSource, int numSamplesToRead)
 Reads samples from the stream.
 
bool read (int *const *destChannels, int numDestChannels, int64 startSampleInSource, int numSamplesToRead, bool fillLeftoverChannelsWithCopies)
 Reads samples from the stream.
 
bool read (AudioBuffer< float > *buffer, int startSampleInDestBuffer, int numSamples, int64 readerStartSample, bool useReaderLeftChan, bool useReaderRightChan)
 Fills a section of an AudioBuffer from this reader.
 
virtual void readMaxLevels (int64 startSample, int64 numSamples, Range< float > *results, int numChannelsToRead)
 Finds the highest and lowest sample levels from a section of the audio stream.
 
virtual void readMaxLevels (int64 startSample, int64 numSamples, float &lowestLeft, float &highestLeft, float &lowestRight, float &highestRight)
 Finds the highest and lowest sample levels from a section of the audio stream.
 
int64 searchForLevel (int64 startSample, int64 numSamplesToSearch, double magnitudeRangeMinimum, double magnitudeRangeMaximum, int minimumConsecutiveSamples)
 Scans the source looking for a sample whose magnitude is in a specified range.
 
virtual AudioChannelSet getChannelLayout ()
 Get the channel layout of the audio stream.
 

Public Attributes

int64 startInSamples = 0
 The starting point of the reader in playback samples.
 
- Public Attributes inherited from AudioFormatReader
double sampleRate = 0
 The sample-rate of the stream.
 
unsigned int bitsPerSample = 0
 The number of bits per sample, e.g.
 
int64 lengthInSamples = 0
 The total number of samples in the audio stream.
 
unsigned int numChannels = 0
 The total number of channels in the audio stream.
 
bool usesFloatingPointData = false
 Indicates whether the data is floating-point or fixed.
 
StringPairArray metadataValues
 A set of metadata values that the reader has pulled out of the stream.
 
InputStreaminput
 The input stream, for use by subclasses.
 

Additional Inherited Members

- Protected Member Functions inherited from AudioFormatReader
 AudioFormatReader (InputStream *sourceStream, const String &formatName)
 Creates an AudioFormatReader object.
 
- Static Protected Member Functions inherited from AudioFormatReader
static void clearSamplesBeyondAvailableLength (int *const *destChannels, int numDestChannels, int startOffsetInDestBuffer, int64 startSampleInFile, int &numSamples, int64 fileLengthInSamples)
 Used by AudioFormatReader subclasses to clear any parts of the data blocks that lie beyond the end of their available length.
 

Detailed Description

Subclass of AudioFormatReader that reads samples from a group of playback regions.

Plug-Ins typically use this to draw the output of a playback region in their UI.

In order to read from playback regions, the reader requires an audio processor that acts as ARA playback renderer. Configuring the audio processor for real-time operation results in the reader being real-time capable too, unlike most other AudioFormatReaders. The reader instance will take care of adding all regions being read to the renderer and invoke its processBlock function in order to read the region samples.

The reader becomes invalid if

  • any region properties are updated in a way that would affect its samples,
  • any region content is updated in a way that would affect its samples, or
  • any of its regions are destroyed.

Constructor & Destructor Documentation

◆ ARAPlaybackRegionReader() [1/2]

ARAPlaybackRegionReader::ARAPlaybackRegionReader ( ARAPlaybackRegion * playbackRegion)
explicit

Create an ARAPlaybackRegionReader instance to read the given playbackRegion, using the sample rate and channel count of the underlying ARAAudioSource.

Parameters
playbackRegionThe playback region that should be read - must not be nullptr!

◆ ARAPlaybackRegionReader() [2/2]

ARAPlaybackRegionReader::ARAPlaybackRegionReader ( double sampleRate,
int numChannels,
const std::vector< ARAPlaybackRegion * > & playbackRegions )

Create an ARAPlaybackRegionReader instance to read the given playbackRegions.

Parameters
sampleRateThe sample rate that should be used for reading.
numChannelsThe channel count that should be used for reading.
playbackRegionsThe vector of playback regions that should be read - must not be empty! All regions must be part of the same ARADocument.

◆ ~ARAPlaybackRegionReader()

ARAPlaybackRegionReader::~ARAPlaybackRegionReader ( )
override

Member Function Documentation

◆ isValid()

bool ARAPlaybackRegionReader::isValid ( ) const

Returns true as long as any of the reader's underlying playback region's haven't changed.

◆ invalidate()

void ARAPlaybackRegionReader::invalidate ( )

Invalidate the reader - this should be called if the sample content of any of the reader's ARAPlaybackRegions changes.

◆ readSamples()

bool ARAPlaybackRegionReader::readSamples ( int *const * destChannels,
int numDestChannels,
int startOffsetInDestBuffer,
int64 startSampleInFile,
int numSamples )
overridevirtual

Subclasses must implement this method to perform the low-level read operation.

Callers should use read() instead of calling this directly.

Parameters
destChannelsthe array of destination buffers to fill. Some of these pointers may be null
numDestChannelsthe number of items in the destChannels array. This value is guaranteed not to be greater than the number of channels that this reader object contains
startOffsetInDestBufferthe number of samples from the start of the dest data at which to begin writing
startSampleInFilethe number of samples into the source data at which to begin reading. This value is guaranteed to be >= 0.
numSamplesthe number of samples to read

Implements AudioFormatReader.

◆ willUpdatePlaybackRegionProperties()

void ARAPlaybackRegionReader::willUpdatePlaybackRegionProperties ( ARAPlaybackRegion * playbackRegion,
ARAPlaybackRegion::PropertiesPtr newProperties )
overridevirtual

Called before the playback region's properties are updated.

Parameters
playbackRegionThe playback region whose properties will be updated.
newPropertiesThe playback region properties that will be assigned to playbackRegion.

Reimplemented from ARAPlaybackRegionListener.

◆ didUpdatePlaybackRegionContent()

void ARAPlaybackRegionReader::didUpdatePlaybackRegionContent ( ARAPlaybackRegion * playbackRegion,
ARAContentUpdateScopes scopeFlags )
overridevirtual

Called when the playback region's content (i.e.

samples or notes) changes.

Parameters
playbackRegionThe playback region with updated content.
scopeFlagsThe scope of the content update.

Reimplemented from ARAPlaybackRegionListener.

◆ willDestroyPlaybackRegion()

void ARAPlaybackRegionReader::willDestroyPlaybackRegion ( ARAPlaybackRegion * playbackRegion)
overridevirtual

Called before the playback region is destroyed.

Parameters
playbackRegionThe playback region that will be destroyed.

Reimplemented from ARAPlaybackRegionListener.

Member Data Documentation

◆ startInSamples

int64 ARAPlaybackRegionReader::startInSamples = 0

The starting point of the reader in playback samples.


The documentation for this class was generated from the following file:
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