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150 lines
3.2 KiB
150 lines
3.2 KiB
/*
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mpeg video picture
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Copyright (C) 2000 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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#include "picture.h"
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Picture::Picture() {
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/* Initialize pointers to extension and user data. */
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extraBit=0;
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startOfPicStamp=new TimeStamp();
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extension=new MpegExtension();
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}
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Picture::~Picture() {
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delete startOfPicStamp;
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delete extension;
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}
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/*
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*--------------------------------------------------------------
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*
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* ParsePicture --
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*
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* Parses picture header. Marks picture to be presented
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* at particular time given a time stamp.
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*
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* Results:
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* Values from picture header put into video stream structure.
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*
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* Side effects:
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* Bit stream irreversibly parsed.
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*
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*--------------------------------------------------------------
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*/
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int Picture::processPicture(MpegVideoStream* mpegVideoStream) {
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TimeStamp* stamp;
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/* Flush header start code. */
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mpegVideoStream->flushBits(32);
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/* Parse off temporal reference. */
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temp_ref=mpegVideoStream->getBits(10);
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/* Parse of picture type. */
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code_type=mpegVideoStream->getBits(3);
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// get timestamp from stamp queue
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stamp=mpegVideoStream->getCurrentTimeStamp();
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stamp->copyTo(startOfPicStamp);
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// now invalidate the PTSFlag
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stamp->setPTSFlag(false);
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/* Parse off vbv buffer delay value. */
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vbv_delay=mpegVideoStream->getBits(16);
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/* If P or B type frame... */
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if ((code_type == P_TYPE) || (code_type == B_TYPE)) {
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/* Parse off forward vector full pixel flag. sets it to true/false*/
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full_pel_forw_vector=mpegVideoStream->getBits(1);
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/* Parse of forw_r_code. */
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/* Decode forw_r_code into forw_r_size and forw_f. */
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forw_r_size=mpegVideoStream->getBits(3);
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forw_r_size--;
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forw_f = (1 << forw_r_size);
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}
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/* If B type frame... */
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if (code_type == B_TYPE) {
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/* Parse off back vector full pixel flag. */
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full_pel_back_vector=mpegVideoStream->getBits(1);
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/* Parse off back_r_code. */
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/* Decode back_r_code into back_r_size and back_f. */
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back_r_size=mpegVideoStream->getBits(3);
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back_r_size--;
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back_f = (1 << back_r_size);
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}
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/* Get extra bit picture info. */
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/*
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extraBit=mpegVideoStream->getBits(1);
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if (extraBit) {
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cout << "extraBit"<<endl;
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exit(0);
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extension->processExtBuffer(mpegVideoStream);
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}
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*/
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extension->processExtra_bit_info(mpegVideoStream);
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extension->processExtensionData(mpegVideoStream);
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return true;
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}
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int Picture::processPictureCodingExtension(MpegVideoStream* ) {
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return true;
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}
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unsigned int Picture::geth_back_r(MpegVideoStream* mpegVideoStream) {
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return mpegVideoStream->getBits(back_r_size);
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}
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unsigned int Picture::getv_back_r(MpegVideoStream* mpegVideoStream) {
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return mpegVideoStream->getBits(back_r_size);
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}
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unsigned int Picture::geth_forw_r(MpegVideoStream* mpegVideoStream) {
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return mpegVideoStream->getBits(forw_r_size);
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}
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unsigned int Picture::getv_forw_r(MpegVideoStream* mpegVideoStream) {
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return mpegVideoStream->getBits(forw_r_size);
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}
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