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48 lines
1.4 KiB
C++
48 lines
1.4 KiB
C++
#ifndef MANGLE_SOUND_SAMPLE_READER_H
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#define MANGLE_SOUND_SAMPLE_READER_H
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#include "../source.hpp"
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namespace Mangle {
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namespace Sound {
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/* This is a helper base class for other SampleSource
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implementations. Certain sources (like Audiere and libsndfile)
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insist on reading whole samples rather than bytes. This class
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compensates for that, and allows you to read bytes rather than
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samples.
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There are two ways for subclasses to use this class. EITHER call
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setup() with the size of frameSize. This will allocate a buffer,
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which the destructor frees. OR set frameSize manually and
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manipulate the pullOver pointer yourself. In that case you MUST
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reset it to NULL if you don't want the destructor to call
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delete[] on it.
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*/
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class SampleReader : public SampleSource
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{
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// How much of the above buffer is in use.
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int pullSize;
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protected:
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// Pullover buffer
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char* pullOver;
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// Size of one frame, in bytes. This is also the size of the
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// pullOver buffer.
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int frameSize;
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// The parameter gives the size of one sample/frame, in bytes.
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void setup(int);
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// Read the given number of samples, in multiples of frameSize. Does
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// not have to set or respect isEof.
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virtual size_t readSamples(void *data, size_t num) = 0;
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public:
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SampleReader() : pullSize(0), pullOver(NULL) {}
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~SampleReader();
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size_t read(void *data, size_t length);
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};
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}} // Namespace
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#endif
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