osb/source/core/StarAudio.hpp

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#pragma once
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#include "StarIODevice.hpp"
namespace Star {
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extern float const DefaultPerceptualRangeDb;
extern float const DefaultPerceptualBoostRangeDb;
float perceptualToAmplitude(float perceptual, float normalizedMax = 1.f,
float range = DefaultPerceptualRangeDb, float boostRange = DefaultPerceptualBoostRangeDb);
float amplitudeToPerceptual(float amp, float normalizedMax = 1.f,
float range = DefaultPerceptualRangeDb, float boostRange = DefaultPerceptualBoostRangeDb);
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STAR_CLASS(CompressedAudioImpl);
STAR_CLASS(UncompressedAudioImpl);
STAR_CLASS(Audio);
STAR_EXCEPTION(AudioException, StarException);
// Simple class for reading audio files in ogg/vorbis and wav format.
// Reads and allows for decompression of a limited subset of ogg/vorbis. Does
// not handle multiple bitstreams, sample rate or channel number changes.
// Entire stream is kept in memory, and is implicitly shared so copying Audio
// instances is not expensive.
class Audio {
public:
explicit Audio(IODevicePtr device);
Audio(Audio const& audio);
Audio(Audio&& audio);
Audio& operator=(Audio const& audio);
Audio& operator=(Audio&& audio);
// This function returns the number of channels that this file has. Channels
// are static throughout file.
unsigned channels() const;
// This function returns the sample rate that this file has. Sample rates
// are static throughout file.
unsigned sampleRate() const;
// This function returns the playtime duration of the file.
double totalTime() const;
// This function returns total number of samples in this file.
uint64_t totalSamples() const;
// This function returns true when the datastream or file being read from is
// a vorbis compressed file. False otherwise.
bool compressed() const;
// If compressed, permanently uncompresses audio for faster reading. The
// uncompressed buffer is shared with all further copies of Audio, and this
// is irreversible.
void uncompress();
// This function seeks the data stream to the given time in seconds.
void seekTime(double time);
// This function seeks the data stream to the given sample number
void seekSample(uint64_t sample);
// This function converts the current offset of the file to the time value of
// that offset in seconds.
double currentTime() const;
// This function converts the current offset of the file to the current
// sample number.
uint64_t currentSample() const;
// Reads into 16 bit signed buffer with channels interleaved. Returns total
// number of samples read (counting each channel individually). 0 indicates
// end of stream.
size_t readPartial(int16_t* buffer, size_t bufferSize);
// Same as readPartial, but repeats read attempting to fill buffer as much as
// possible
size_t read(int16_t* buffer, size_t bufferSize);
// Read into a given buffer, while also converting into the given number of
// channels at the given sample rate and playback velocity. If the number of
// channels in the file is higher, only populates lower channels, if it is
// lower, the last channel is copied to the remaining channels. Attempts to
// fill the buffer as much as possible up to end of stream. May fail to fill
// an entire buffer depending on the destinationSampleRate / velocity /
// available samples.
size_t resample(unsigned destinationChannels, unsigned destinationSampleRate,
int16_t* destinationBuffer, size_t destinationBufferSize,
double velocity = 1.0);
private:
// If audio is uncompressed, this will be null.
CompressedAudioImplPtr m_compressed;
UncompressedAudioImplPtr m_uncompressed;
ByteArray m_workingBuffer;
};
}