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86 lines
2.0 KiB
86 lines
2.0 KiB
15 years ago
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/*
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class for managing byte positions and associated time positions
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Copyright (C) 1999 Martin Vogt
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU Library General Public License as published by
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the Free Software Foundation.
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For more information look at the file COPYRIGHT in this package
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*/
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#ifndef __TIMESTAMPARRAY_H
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#define __TIMESTAMPARRAY_H
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#include "abstract/abs_thread.h"
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#include "timeStamp.h"
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/**
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This class deals with the problem to sync audio and video.
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Both streams are decoded in different threads, sometimes
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the video is decoded faster than the audio and sometimes
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not.
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<p>
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You need a general mechanism to decide, which is faster.
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It works like this:
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<p>
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When the mpeg stream is split in video/audio part the split thread
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writes the video/audio data to the inputInterface.
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Additionally it writes a timestamp to the interface.
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The interface counts the bytes and forward the bytes/timeStamp
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pait to this class.
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Later when the threads write to the outputInterface the ask
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this class (with the bytePostions) which timestamp it
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has and hass the data and the timestamp to the outputInterface.
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There we can decide what to do with the data.
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<p>
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1) audio faster than video = drop video picture
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<p>
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2) video faster than audio - wait for audio.
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*/
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class TimeStampArray {
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TimeStamp** tStampArray;
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int lastWritePos;
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int writePos;
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int readPos;
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int fillgrade;
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char* name;
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int entries;
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abs_thread_mutex_t writeInMut;
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abs_thread_mutex_t changeMut;
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public:
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TimeStampArray(char* name,int entries);
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~TimeStampArray();
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int insertTimeStamp(TimeStamp* src,long key,int len);
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TimeStamp* getReadTimeStamp();
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TimeStamp* getTimeStamp(long key);
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int getFillgrade();
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void forward();
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void clear();
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int bytesUntilNext(long key);
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private:
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void lockStampArray();
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void unlockStampArray();
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void internalForward();
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};
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#endif
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