| /********** |
| This library is free software; you can redistribute it and/or modify it under |
| the terms of the GNU Lesser General Public License as published by the |
| Free Software Foundation; either version 3 of the License, or (at your |
| option) any later version. (See <http://www.gnu.org/copyleft/lesser.html>.) |
| |
| This library is distributed in the hope that it will be useful, but WITHOUT |
| ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS |
| FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for |
| more details. |
| |
| You should have received a copy of the GNU Lesser General Public License |
| along with this library; if not, write to the Free Software Foundation, Inc., |
| 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
| **********/ |
| // "liveMedia" |
| // Copyright (c) 1996-2020 Live Networks, Inc. All rights reserved. |
| // Interleaving of MP3 ADUs |
| // C++ header |
| |
| #ifndef _MP3_ADU_INTERLEAVING_HH |
| #define _MP3_ADU_INTERLEAVING_HH |
| |
| #ifndef _FRAMED_FILTER_HH |
| #include "FramedFilter.hh" |
| #endif |
| |
| // A data structure used to represent an interleaving |
| #define MAX_CYCLE_SIZE 256 |
| class Interleaving { |
| public: |
| Interleaving(unsigned cycleSize, unsigned char const* cycleArray); |
| virtual ~Interleaving(); |
| |
| unsigned cycleSize() const {return fCycleSize;} |
| unsigned char lookupInverseCycle(unsigned char index) const { |
| return fInverseCycle[index]; |
| } |
| |
| private: |
| unsigned fCycleSize; |
| unsigned char fInverseCycle[MAX_CYCLE_SIZE]; |
| }; |
| |
| // This class is used only as a base for the following two: |
| |
| class MP3ADUinterleaverBase: public FramedFilter { |
| protected: |
| MP3ADUinterleaverBase(UsageEnvironment& env, |
| FramedSource* inputSource); |
| // abstract base class |
| virtual ~MP3ADUinterleaverBase(); |
| |
| static FramedSource* getInputSource(UsageEnvironment& env, |
| char const* inputSourceName); |
| static void afterGettingFrame(void* clientData, |
| unsigned numBytesRead, |
| unsigned numTruncatedBytes, |
| struct timeval presentationTime, |
| unsigned durationInMicroseconds); |
| virtual void afterGettingFrame(unsigned numBytesRead, |
| struct timeval presentationTime, |
| unsigned durationInMicroseconds) = 0; |
| }; |
| |
| // This class is used to convert an ADU sequence from non-interleaved |
| // to interleaved form: |
| |
| class MP3ADUinterleaver: public MP3ADUinterleaverBase { |
| public: |
| static MP3ADUinterleaver* createNew(UsageEnvironment& env, |
| Interleaving const& interleaving, |
| FramedSource* inputSource); |
| |
| protected: |
| MP3ADUinterleaver(UsageEnvironment& env, |
| Interleaving const& interleaving, |
| FramedSource* inputSource); |
| // called only by createNew() |
| virtual ~MP3ADUinterleaver(); |
| |
| private: |
| // redefined virtual functions: |
| virtual void doGetNextFrame(); |
| virtual void afterGettingFrame(unsigned numBytesRead, |
| struct timeval presentationTime, |
| unsigned durationInMicroseconds); |
| |
| private: |
| void releaseOutgoingFrame(); |
| |
| private: |
| Interleaving const fInterleaving; |
| class InterleavingFrames* fFrames; |
| unsigned char fPositionOfNextIncomingFrame; |
| unsigned fII, fICC; |
| }; |
| |
| // This class is used to convert an ADU sequence from interleaved |
| // to non-interleaved form: |
| |
| class MP3ADUdeinterleaver: public MP3ADUinterleaverBase { |
| public: |
| static MP3ADUdeinterleaver* createNew(UsageEnvironment& env, |
| FramedSource* inputSource); |
| |
| protected: |
| MP3ADUdeinterleaver(UsageEnvironment& env, |
| FramedSource* inputSource); |
| // called only by createNew() |
| virtual ~MP3ADUdeinterleaver(); |
| |
| private: |
| // redefined virtual functions: |
| virtual void doGetNextFrame(); |
| virtual void afterGettingFrame(unsigned numBytesRead, |
| struct timeval presentationTime, |
| unsigned durationInMicroseconds); |
| |
| private: |
| void releaseOutgoingFrame(); |
| |
| private: |
| class DeinterleavingFrames* fFrames; |
| unsigned fIIlastSeen, fICClastSeen; |
| }; |
| |
| #endif |
| |