| /********** |
| 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. |
| // 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 |