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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. |
| | | // A filter that breaks up an AC3 audio elementary stream into frames |
| | | // C++ header |
| | | |
| | | #ifndef _AC3_AUDIO_STREAM_FRAMER_HH |
| | | #define _AC3_AUDIO_STREAM_FRAMER_HH |
| | | |
| | | #ifndef _FRAMED_FILTER_HH |
| | | #include "FramedFilter.hh" |
| | | #endif |
| | | |
| | | class AC3AudioStreamFramer: public FramedFilter { |
| | | public: |
| | | static AC3AudioStreamFramer* |
| | | createNew(UsageEnvironment& env, FramedSource* inputSource, |
| | | unsigned char streamCode = 0); |
| | | // If "streamCode" != 0, then we assume that there's a 1-byte code at the beginning of each chunk of data that we read from |
| | | // our source. If that code is not the value we want, we discard the chunk of data. |
| | | // However, if "streamCode" == 0 (the default), then we don't expect this 1-byte code. |
| | | |
| | | unsigned samplingRate(); |
| | | |
| | | void flushInput(); // called if there is a discontinuity (seeking) in the input |
| | | |
| | | private: |
| | | AC3AudioStreamFramer(UsageEnvironment& env, FramedSource* inputSource, |
| | | unsigned char streamCode); |
| | | // called only by createNew() |
| | | virtual ~AC3AudioStreamFramer(); |
| | | |
| | | static void handleNewData(void* clientData, |
| | | unsigned char* ptr, unsigned size, |
| | | struct timeval presentationTime); |
| | | void handleNewData(unsigned char* ptr, unsigned size); |
| | | |
| | | void parseNextFrame(); |
| | | |
| | | private: |
| | | // redefined virtual functions: |
| | | virtual void doGetNextFrame(); |
| | | |
| | | private: |
| | | struct timeval currentFramePlayTime() const; |
| | | |
| | | private: |
| | | struct timeval fNextFramePresentationTime; |
| | | |
| | | private: // parsing state |
| | | class AC3AudioStreamParser* fParser; |
| | | unsigned char fOurStreamCode; |
| | | friend class AC3AudioStreamParser; // hack |
| | | }; |
| | | |
| | | #endif |