80 lines
1.6 KiB
C
80 lines
1.6 KiB
C
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#ifndef DECODER_H
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#define DECODER_H
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/**
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* @todo write docs
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*/
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#include <deque>
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#include <emscripten/val.h>
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#include <emscripten/bind.h>
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#include "mad.h"
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#define GLUE_LENGTH 6000
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#define DEBUGGING false
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class Decoder {
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public:
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Decoder();
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~Decoder();
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void addFragment(const emscripten::val& array);
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emscripten::val decode(uint32_t count = UINT32_MAX);
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bool hasMore() const;
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uint32_t framesLeft(uint32_t max = UINT32_MAX);
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private:
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enum State {
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empty,
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onBufferHalf,
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onBufferFull,
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onGlueHalf,
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onGlueFull
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};
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struct RawBuffer {
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uint8_t* ptr;
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uint32_t length;
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};
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State state;
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uint32_t sampleRate;
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uint8_t channels;
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uint32_t cachedLength;
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uint16_t samplesPerFrame;
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uint8_t* glue;
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uint8_t const* cachedNext;
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uint8_t const* cachedThis;
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mad_error cachedError;
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bool cached;
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mad_synth* synth;
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mad_stream* stream;
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mad_frame* frame;
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emscripten::val context;
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std::deque<RawBuffer> pending;
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private:
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void pullBuffer();
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void changeBuffer();
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void prepareNextBuffer();
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void initializeProbe(mad_stream& probe);
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void switchToGlue();
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void switchBuffer(uint8_t* bufferPtr, uint32_t length);
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};
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EMSCRIPTEN_BINDINGS(jsmad) {
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emscripten::class_<Decoder>("Decoder")
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.constructor<>()
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.function("addFragment", &Decoder::addFragment)
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.function("hasMore", &Decoder::hasMore)
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.function("framesLeft", &Decoder::framesLeft)
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.function("decode", &Decoder::decode);
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}
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#endif // DECODER_H
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