/**********
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This library is free software; you can redistribute it and/or modify it under
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the terms of the GNU Lesser General Public License as published by the
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Free Software Foundation; either version 3 of the License, or (at your
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option) any later version. (See <http://www.gnu.org/copyleft/lesser.html>.)
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This library is distributed in the hope that it will be useful, but WITHOUT
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ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for
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more details.
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You should have received a copy of the GNU Lesser General Public License
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along with this library; if not, write to the Free Software Foundation, Inc.,
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51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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**********/
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// "liveMedia"
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// Copyright (c) 1996-2017 Live Networks, Inc. All rights reserved.
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// Interleaving of MP3 ADUs
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// C++ header
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#ifndef _MP3_ADU_INTERLEAVING_HH
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#define _MP3_ADU_INTERLEAVING_HH
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#ifndef _FRAMED_FILTER_HH
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#include "FramedFilter.hh"
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#endif
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// A data structure used to represent an interleaving
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#define MAX_CYCLE_SIZE 256
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class Interleaving {
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public:
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Interleaving(unsigned cycleSize, unsigned char const* cycleArray);
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virtual ~Interleaving();
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unsigned cycleSize() const {return fCycleSize;}
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unsigned char lookupInverseCycle(unsigned char index) const {
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return fInverseCycle[index];
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}
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private:
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unsigned fCycleSize;
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unsigned char fInverseCycle[MAX_CYCLE_SIZE];
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};
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// This class is used only as a base for the following two:
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class MP3ADUinterleaverBase: public FramedFilter {
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protected:
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MP3ADUinterleaverBase(UsageEnvironment& env,
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FramedSource* inputSource);
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// abstract base class
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virtual ~MP3ADUinterleaverBase();
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static FramedSource* getInputSource(UsageEnvironment& env,
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char const* inputSourceName);
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static void afterGettingFrame(void* clientData,
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unsigned numBytesRead,
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unsigned numTruncatedBytes,
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struct timeval presentationTime,
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unsigned durationInMicroseconds);
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virtual void afterGettingFrame(unsigned numBytesRead,
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struct timeval presentationTime,
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unsigned durationInMicroseconds) = 0;
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};
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// This class is used to convert an ADU sequence from non-interleaved
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// to interleaved form:
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class MP3ADUinterleaver: public MP3ADUinterleaverBase {
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public:
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static MP3ADUinterleaver* createNew(UsageEnvironment& env,
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Interleaving const& interleaving,
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FramedSource* inputSource);
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protected:
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MP3ADUinterleaver(UsageEnvironment& env,
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Interleaving const& interleaving,
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FramedSource* inputSource);
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// called only by createNew()
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virtual ~MP3ADUinterleaver();
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private:
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// redefined virtual functions:
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virtual void doGetNextFrame();
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virtual void afterGettingFrame(unsigned numBytesRead,
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struct timeval presentationTime,
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unsigned durationInMicroseconds);
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private:
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void releaseOutgoingFrame();
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private:
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Interleaving const fInterleaving;
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class InterleavingFrames* fFrames;
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unsigned char fPositionOfNextIncomingFrame;
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unsigned fII, fICC;
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};
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// This class is used to convert an ADU sequence from interleaved
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// to non-interleaved form:
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class MP3ADUdeinterleaver: public MP3ADUinterleaverBase {
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public:
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static MP3ADUdeinterleaver* createNew(UsageEnvironment& env,
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FramedSource* inputSource);
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protected:
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MP3ADUdeinterleaver(UsageEnvironment& env,
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FramedSource* inputSource);
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// called only by createNew()
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virtual ~MP3ADUdeinterleaver();
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private:
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// redefined virtual functions:
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virtual void doGetNextFrame();
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virtual void afterGettingFrame(unsigned numBytesRead,
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struct timeval presentationTime,
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unsigned durationInMicroseconds);
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private:
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void releaseOutgoingFrame();
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private:
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class DeinterleavingFrames* fFrames;
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unsigned fIIlastSeen, fICClastSeen;
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};
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#endif
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