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| | |
| | | /********** |
| | | 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) 1996-2017 Live Networks, Inc. All rights reserved. |
| | | // 'ADU' MP3 streams (for improved loss-tolerance) |
| | | // C++ header |
| | | |
| | | #ifndef _MP3_ADU_HH |
| | | #define _MP3_ADU_HH |
| | | |
| | | #ifndef _FRAMED_FILTER_HH |
| | | #include "FramedFilter.hh" |
| | | #endif |
| | | |
| | | class ADUFromMP3Source: public FramedFilter { |
| | | public: |
| | | static ADUFromMP3Source* createNew(UsageEnvironment& env, |
| | | FramedSource* inputSource, |
| | | Boolean includeADUdescriptors = True); |
| | | |
| | | void resetInput(); |
| | | // This is called whenever there's a discontinuity in the input MP3 source |
| | | // (e.g., due to seeking within the source). It causes any still-unprocessed |
| | | // MP3 frame data within our queue to be discarded, so that it does not |
| | | // erroneously get used by backpointers from the new MP3 frames. |
| | | |
| | | Boolean setScaleFactor(int scale); |
| | | |
| | | protected: |
| | | ADUFromMP3Source(UsageEnvironment& env, |
| | | FramedSource* inputSource, |
| | | Boolean includeADUdescriptors); |
| | | // called only by createNew() |
| | | virtual ~ADUFromMP3Source(); |
| | | |
| | | private: |
| | | // Redefined virtual functions: |
| | | virtual void doGetNextFrame(); |
| | | virtual char const* MIMEtype() const; |
| | | |
| | | private: |
| | | Boolean doGetNextFrame1(); |
| | | |
| | | private: |
| | | Boolean fAreEnqueueingMP3Frame; |
| | | class SegmentQueue* fSegments; |
| | | Boolean fIncludeADUdescriptors; |
| | | unsigned fTotalDataSizeBeforePreviousRead; |
| | | int fScale; |
| | | unsigned fFrameCounter; |
| | | }; |
| | | |
| | | class MP3FromADUSource: public FramedFilter { |
| | | public: |
| | | static MP3FromADUSource* createNew(UsageEnvironment& env, |
| | | FramedSource* inputSource, |
| | | Boolean includeADUdescriptors = True); |
| | | |
| | | protected: |
| | | MP3FromADUSource(UsageEnvironment& env, |
| | | FramedSource* inputSource, |
| | | Boolean includeADUdescriptors); |
| | | // called only by createNew() |
| | | virtual ~MP3FromADUSource(); |
| | | |
| | | private: |
| | | // Redefined virtual functions: |
| | | virtual void doGetNextFrame(); |
| | | virtual char const* MIMEtype() const; |
| | | |
| | | private: |
| | | Boolean needToGetAnADU(); |
| | | void insertDummyADUsIfNecessary(); |
| | | Boolean generateFrameFromHeadADU(); |
| | | |
| | | private: |
| | | Boolean fAreEnqueueingADU; |
| | | class SegmentQueue* fSegments; |
| | | }; |
| | | |
| | | // Definitions of external C functions that implement various MP3 operations: |
| | | extern "C" int mp3ZeroOutSideInfo(unsigned char*, unsigned, unsigned); |
| | | |
| | | #endif |