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/*
mpeg video picture
Copyright (C) 2000 Martin Vogt
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU Library General Public License as published by
the Free Software Foundation.
For more information look at the file COPYRIGHT in this package
*/
#include "picture.h"
Picture::Picture() {
/* Initialize pointers to extension and user data. */
extraBit=0;
startOfPicStamp=new TimeStamp();
extension=new MpegExtension();
}
Picture::~Picture() {
delete startOfPicStamp;
delete extension;
}
/*
*--------------------------------------------------------------
*
* ParsePicture --
*
* Parses picture header. Marks picture to be presented
* at particular time given a time stamp.
*
* Results:
* Values from picture header put into video stream structure.
*
* Side effects:
* Bit stream irreversibly parsed.
*
*--------------------------------------------------------------
*/
int Picture::processPicture(MpegVideoStream* mpegVideoStream) {
TimeStamp* stamp;
/* Flush header start code. */
mpegVideoStream->flushBits(32);
/* Parse off temporal reference. */
temp_ref=mpegVideoStream->getBits(10);
/* Parse of picture type. */
code_type=mpegVideoStream->getBits(3);
// get timestamp from stamp queue
stamp=mpegVideoStream->getCurrentTimeStamp();
stamp->copyTo(startOfPicStamp);
// now invalidate the PTSFlag
stamp->setPTSFlag(false);
/* Parse off vbv buffer delay value. */
vbv_delay=mpegVideoStream->getBits(16);
/* If P or B type frame... */
if ((code_type == P_TYPE) || (code_type == B_TYPE)) {
/* Parse off forward vector full pixel flag. sets it to true/false*/
full_pel_forw_vector=mpegVideoStream->getBits(1);
/* Parse of forw_r_code. */
/* Decode forw_r_code into forw_r_size and forw_f. */
forw_r_size=mpegVideoStream->getBits(3);
forw_r_size--;
forw_f = (1 << forw_r_size);
}
/* If B type frame... */
if (code_type == B_TYPE) {
/* Parse off back vector full pixel flag. */
full_pel_back_vector=mpegVideoStream->getBits(1);
/* Parse off back_r_code. */
/* Decode back_r_code into back_r_size and back_f. */
back_r_size=mpegVideoStream->getBits(3);
back_r_size--;
back_f = (1 << back_r_size);
}
/* Get extra bit picture info. */
/*
extraBit=mpegVideoStream->getBits(1);
if (extraBit) {
cout << "extraBit"<<endl;
exit(0);
extension->processExtBuffer(mpegVideoStream);
}
*/
extension->processExtra_bit_info(mpegVideoStream);
extension->processExtensionData(mpegVideoStream);
return true;
}
int Picture::processPictureCodingExtension(MpegVideoStream* ) {
return true;
}
unsigned int Picture::geth_back_r(MpegVideoStream* mpegVideoStream) {
return mpegVideoStream->getBits(back_r_size);
}
unsigned int Picture::getv_back_r(MpegVideoStream* mpegVideoStream) {
return mpegVideoStream->getBits(back_r_size);
}
unsigned int Picture::geth_forw_r(MpegVideoStream* mpegVideoStream) {
return mpegVideoStream->getBits(forw_r_size);
}
unsigned int Picture::getv_forw_r(MpegVideoStream* mpegVideoStream) {
return mpegVideoStream->getBits(forw_r_size);
}
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