vstream.cc
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上传日期:2007-01-06
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文件大小:2k
- /*
- File: vstream.cc
- By: Alex Theo de Jong
- Created: February 1996
-
- Description:
- Video Stream buffer for MPEG player
- */
- #ifdef __GNUG__
- #pragma implementation
- #endif
- #include <stdio.h>
- #include <fstream.h>
- #include <sys/time.h>
- #include "athread.hh"
- #include "error.hh"
- #include "debug.hh"
- #include "util.hh"
- #include "sync.hh"
- #include "mpeg2const.hh"
- #include "mpeg2buff.hh"
- #include "vstream.hh"
- /*
- *
- * VideoStream
- *
- */
- VideoStream::VideoStream(const char* filename, int bitrate) :
- bfr(0), value(0), bytes(0), bytes_available(0), chunksize(512), incnt(0), file(True) {
- inputstream=new Mpeg2Input(filename, 8196, bitrate);
- sync=0;
- }
- VideoStream::VideoStream(Mpeg2Buffer* input, Synchronization* s) :
- bfr(0), value(0), bytes(0), bytes_available(0), chunksize(512*10), incnt(0), file(False) {
- inputstream=input;
- sync=s;
- }
- VideoStream::~VideoStream(){
- inputstream->close();
- if (file) delete inputstream;
- }
- unsigned int VideoStream::getNewByte(){
- int i;
- if (sync) i = sync->usedbytes(1, chunksize);
- if ((bytes=bytes_available=inputstream->waitforbytes(chunksize))<=0){
- TRACER("Video done - exit on waitforbytes");
- athr_exit(0);
- }
- // if (sync) sync->usedbytes(1, bytes);
- // if (sync) sync->usedbytes(1, chunksize);
- return inputstream->getbyte();
- }
- #ifdef DEBUG
- // This stuff is declared inline if not DEBUG
- void VideoStream::fill(){
- if (!incnt) bfr=0; for (; incnt<=24; incnt+=8) bfr|=(getbyte() << (24 - incnt));
- }
- unsigned int VideoStream::startcode(){
- if (incnt&7){ bfr<<=(incnt&7); incnt-=(incnt&7); } // Byte align & fill bfr
- fill();
- for (; ((bfr >> 8)!=Packet_start_code_prefix); ){ bfr<<=8; bfr|=getbyte(); } // search
- return bfr;
- }
- #endif