openshot-audio
0.1.4
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#include <juce_audio_formats.h>
Public Member Functions | |
AudioSubsectionReader (AudioFormatReader *sourceReader, int64 subsectionStartSample, int64 subsectionLength, bool deleteSourceWhenDeleted) | |
~AudioSubsectionReader () | |
bool | readSamples (int **destSamples, int numDestChannels, int startOffsetInDestBuffer, int64 startSampleInFile, int numSamples) override |
void | readMaxLevels (int64 startSample, int64 numSamples, Range< float > *results, int numChannelsToRead) override |
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virtual | ~AudioFormatReader () |
const String & | getFormatName () const noexcept |
bool | read (int *const *destSamples, int numDestChannels, int64 startSampleInSource, int numSamplesToRead, bool fillLeftoverChannelsWithCopies) |
void | read (AudioSampleBuffer *buffer, int startSampleInDestBuffer, int numSamples, int64 readerStartSample, bool useReaderLeftChan, bool useReaderRightChan) |
virtual void | readMaxLevels (int64 startSample, int64 numSamples, float &lowestLeft, float &highestLeft, float &lowestRight, float &highestRight) |
int64 | searchForLevel (int64 startSample, int64 numSamplesToSearch, double magnitudeRangeMinimum, double magnitudeRangeMaximum, int minimumConsecutiveSamples) |
Additional Inherited Members | |
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double | sampleRate |
unsigned int | bitsPerSample |
int64 | lengthInSamples |
unsigned int | numChannels |
bool | usesFloatingPointData |
StringPairArray | metadataValues |
InputStream * | input |
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AudioFormatReader (InputStream *sourceStream, const String &formatName) | |
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static void | clearSamplesBeyondAvailableLength (int **destSamples, int numDestChannels, int startOffsetInDestBuffer, int64 startSampleInFile, int &numSamples, int64 fileLengthInSamples) |
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 |
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 juce::AudioFormatReader.
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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 juce::AudioFormatReader.