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JUCE
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This class is used to wrap an AudioFormatReader and only read from a subsection of the file. More...
Inheritance diagram for AudioSubsectionReader:Public Member Functions | |
| AudioSubsectionReader (AudioFormatReader *sourceReader, int64 subsectionStartSample, int64 subsectionLength, bool deleteSourceWhenDeleted) | |
| Creates an AudioSubsectionReader for a given data source. More... | |
| ~AudioSubsectionReader () | |
| Destructor. More... | |
| bool | readSamples (int **destSamples, int numDestChannels, int startOffsetInDestBuffer, int64 startSampleInFile, int numSamples) override |
| Subclasses must implement this method to perform the low-level read operation. More... | |
| void | readMaxLevels (int64 startSample, int64 numSamples, Range< float > *results, int numChannelsToRead) override |
| Finds the highest and lowest sample levels from a section of the audio stream. More... | |
| Public Member Functions inherited from AudioFormatReader | |
| virtual | ~AudioFormatReader () |
| Destructor. More... | |
| const String & | getFormatName () const noexcept |
| Returns a description of what type of format this is. More... | |
| bool | read (int *const *destSamples, int numDestChannels, int64 startSampleInSource, int numSamplesToRead, bool fillLeftoverChannelsWithCopies) |
| Reads samples from the stream. More... | |
| void | read (AudioSampleBuffer *buffer, int startSampleInDestBuffer, int numSamples, int64 readerStartSample, bool useReaderLeftChan, bool useReaderRightChan) |
| Fills a section of an AudioSampleBuffer from this reader. More... | |
| 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. More... | |
| 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. More... | |
Additional Inherited Members | |
| Public Attributes inherited from AudioFormatReader | |
| double | sampleRate |
| The sample-rate of the stream. More... | |
| unsigned int | bitsPerSample |
| The number of bits per sample, e.g. More... | |
| int64 | lengthInSamples |
| The total number of samples in the audio stream. More... | |
| unsigned int | numChannels |
| The total number of channels in the audio stream. More... | |
| bool | usesFloatingPointData |
| Indicates whether the data is floating-point or fixed. More... | |
| StringPairArray | metadataValues |
| A set of metadata values that the reader has pulled out of the stream. More... | |
| InputStream * | input |
| The input stream, for use by subclasses. More... | |
| Protected Member Functions inherited from AudioFormatReader | |
| AudioFormatReader (InputStream *sourceStream, const String &formatName) | |
| Creates an AudioFormatReader object. More... | |
| Static Protected Member Functions inherited from AudioFormatReader | |
| static void | clearSamplesBeyondAvailableLength (int **destSamples, 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. More... | |
This class is used to wrap an AudioFormatReader and only read from a subsection of the file.
So if you have a reader which can read a 1000 sample file, you could wrap it in one of these to only access, e.g. samples 100 to 200, and any samples outside that will come back as 0. Accessing sample 0 from this reader will actually read the first sample from the other's subsection, which might be at a non-zero position.
| AudioSubsectionReader::AudioSubsectionReader | ( | AudioFormatReader * | sourceReader, |
| int64 | subsectionStartSample, | ||
| int64 | subsectionLength, | ||
| bool | deleteSourceWhenDeleted | ||
| ) |
Creates an AudioSubsectionReader for a given data source.
| sourceReader | the source reader from which we'll be taking data |
| subsectionStartSample | the sample within the source reader which will be mapped onto sample 0 for this reader. |
| subsectionLength | the number of samples from the source that will make up the subsection. If this reader is asked for any samples beyond this region, it will return zero. |
| deleteSourceWhenDeleted | if true, the sourceReader object will be deleted when this object is deleted. |
| AudioSubsectionReader::~AudioSubsectionReader | ( | ) |
Destructor.
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overridevirtual |
Subclasses must implement this method to perform the low-level read operation.
Callers should use read() instead of calling this directly.
| destSamples | the array of destination buffers to fill. Some of these pointers may be null |
| numDestChannels | the number of items in the destSamples array. This value is guaranteed not to be greater than the number of channels that this reader object contains |
| startOffsetInDestBuffer | the number of samples from the start of the dest data at which to begin writing |
| startSampleInFile | the number of samples into the source data at which to begin reading. This value is guaranteed to be >= 0. |
| numSamples | the number of samples to read |
Implements AudioFormatReader.
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overridevirtual |
Finds the highest and lowest sample levels from a section of the audio stream.
This will read a block of samples from the stream, and measure the highest and lowest sample levels from the channels in that section, returning these as normalised floating-point levels.
| startSample | the offset into the audio stream to start reading from. It's ok for this to be beyond the start or end of the stream. |
| numSamples | how many samples to read |
| results | this array will be filled with Range values for each channel. The array must contain numChannels elements. |
| numChannelsToRead | the number of channels of data to scan. This must be more than zero, but not more than the total number of channels that the reader contains |
Reimplemented from AudioFormatReader.
