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authortoma <toma@283d02a7-25f6-0310-bc7c-ecb5cbfe19da>2009-11-25 17:56:58 +0000
committertoma <toma@283d02a7-25f6-0310-bc7c-ecb5cbfe19da>2009-11-25 17:56:58 +0000
commite2de64d6f1beb9e492daf5b886e19933c1fa41dd (patch)
tree9047cf9e6b5c43878d5bf82660adae77ceee097a /mpeglib/lib/mpegplay/motionVector.cpp
downloadtdemultimedia-e2de64d6f1beb9e492daf5b886e19933c1fa41dd.tar.gz
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Copy the KDE 3.5 branch to branches/trinity for new KDE 3.5 features.
BUG:215923 git-svn-id: svn://anonsvn.kde.org/home/kde/branches/trinity/kdemultimedia@1054174 283d02a7-25f6-0310-bc7c-ecb5cbfe19da
Diffstat (limited to 'mpeglib/lib/mpegplay/motionVector.cpp')
-rw-r--r--mpeglib/lib/mpegplay/motionVector.cpp130
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diff --git a/mpeglib/lib/mpegplay/motionVector.cpp b/mpeglib/lib/mpegplay/motionVector.cpp
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+/*
+ class for motionvectors
+ Copyright (C) 1999 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 "motionVector.h"
+
+
+
+
+
+MotionVector::MotionVector() {
+}
+
+
+MotionVector::~MotionVector() {
+}
+
+
+
+/*
+ *--------------------------------------------------------------
+ *
+ * ComputeVector --
+ *
+ * Computes motion vector given parameters previously parsed
+ * and reconstructed.
+ *
+ * Results:
+ * Reconstructed motion vector info is put into recon_* parameters
+ * passed to this function. Also updated previous motion vector
+ * information.
+ *
+ * Side effects:
+ * None.
+ *
+ *--------------------------------------------------------------
+ */
+void MotionVector::computeVector(int* recon_right_ptr,
+ int* recon_down_ptr,
+ int& recon_right_prev,
+ int& recon_down_prev,
+ unsigned int& f,
+ unsigned int& full_pel_vector,
+ int& motion_h_code,
+ int& motion_v_code,
+ unsigned int& motion_h_r,
+ unsigned int& motion_v_r) {
+
+
+ int comp_h_r, comp_v_r;
+ int right_little, right_big, down_little, down_big;
+ int max, min, new_vector;
+
+ /* The following procedure for the reconstruction of motion vectors
+ is a direct and simple implementation of the instructions given
+ in the mpeg December 1991 standard draft.
+ */
+
+ if (f == 1 || motion_h_code == 0)
+ comp_h_r = 0;
+ else
+ comp_h_r = f - 1 - motion_h_r;
+
+ if (f == 1 || motion_v_code == 0)
+ comp_v_r = 0;
+ else
+ comp_v_r = f - 1 - motion_v_r;
+
+ right_little = motion_h_code * f;
+ if (right_little == 0)
+ right_big = 0;
+ else {
+ if (right_little > 0) {
+ right_little = right_little - comp_h_r;
+ right_big = right_little - 32 * f;
+ }
+ else {
+ right_little = right_little + comp_h_r;
+ right_big = right_little + 32 * f;
+ }
+ }
+
+ down_little = motion_v_code * f;
+ if (down_little == 0)
+ down_big = 0;
+ else {
+ if (down_little > 0) {
+ down_little = down_little - comp_v_r;
+ down_big = down_little - 32 * f;
+ }
+ else {
+ down_little = down_little + comp_v_r;
+ down_big = down_little + 32 * f;
+ }
+ }
+
+ max = 16 * f - 1;
+ min = -16 * f;
+
+ new_vector = recon_right_prev + right_little;
+
+ if (new_vector <= max && new_vector >= min)
+ *recon_right_ptr = recon_right_prev + right_little;
+ /* just new_vector */
+ else
+ *recon_right_ptr = recon_right_prev + right_big;
+ recon_right_prev = *recon_right_ptr;
+ if (full_pel_vector)
+ *recon_right_ptr = *recon_right_ptr << 1;
+
+ new_vector = recon_down_prev + down_little;
+ if (new_vector <= max && new_vector >= min)
+ *recon_down_ptr = recon_down_prev + down_little;
+ /* just new_vector */
+ else
+ *recon_down_ptr = recon_down_prev + down_big;
+ recon_down_prev = *recon_down_ptr;
+ if (full_pel_vector)
+ *recon_down_ptr = *recon_down_ptr << 1;
+
+}