src/main/java/net/sourceforge/jaad/aac/sbr/TFGrid.java
public static int envelope_time_border_vector(SBR sbr, int ch) {
		int l, border, temp;
		int[] t_E_temp = new int[6];

		t_E_temp[0] = sbr.rate*sbr.abs_bord_lead[ch];
		t_E_temp[sbr.L_E[ch]] = sbr.rate*sbr.abs_bord_trail[ch];

		switch(sbr.bs_frame_class[ch]) {
			case FIXFIX:
				switch(sbr.L_E[ch]) {
					case 4:
						temp = (sbr.numTimeSlots/4);
						t_E_temp[3] = sbr.rate*3*temp;
						t_E_temp[2] = sbr.rate*2*temp;
						t_E_temp[1] = sbr.rate*temp;
						break;
					case 2:
						t_E_temp[1] = sbr.rate*(sbr.numTimeSlots/2);
						break;
					default:
						break;
				}
				break;

			case FIXVAR:
				if(sbr.L_E[ch]>1) {
					int i = sbr.L_E[ch];
					border = sbr.abs_bord_trail[ch];

					for(l = 0; l<(sbr.L_E[ch]-1); l++) {
						if(border<sbr.bs_rel_bord[ch][l])
							return 1;

						border -= sbr.bs_rel_bord[ch][l];
						t_E_temp[--i] = sbr.rate*border;
					}
				}
				break;

			case VARFIX:
				if(sbr.L_E[ch]>1) {
					int i = 1;
					border = sbr.abs_bord_lead[ch];

					for(l = 0; l<(sbr.L_E[ch]-1); l++) {
						border += sbr.bs_rel_bord[ch][l];

						if(sbr.rate*border+sbr.tHFAdj>sbr.numTimeSlotsRate+sbr.tHFGen)
							return 1;

						t_E_temp[i++] = sbr.rate*border;
					}
				}
				break;

			case VARVAR:
				if(sbr.bs_num_rel_0[ch]!=0) {
					int i = 1;
					border = sbr.abs_bord_lead[ch];

					for(l = 0; l<sbr.bs_num_rel_0[ch]; l++) {
						border += sbr.bs_rel_bord_0[ch][l];

						if(sbr.rate*border+sbr.tHFAdj>sbr.numTimeSlotsRate+sbr.tHFGen)
							return 1;

						t_E_temp[i++] = sbr.rate*border;
					}
				}

				if(sbr.bs_num_rel_1[ch]!=0) {
					int i = sbr.L_E[ch];
					border = sbr.abs_bord_trail[ch];

					for(l = 0; l<sbr.bs_num_rel_1[ch]; l++) {
						if(border<sbr.bs_rel_bord_1[ch][l])
							return 1;

						border -= sbr.bs_rel_bord_1[ch][l];
						t_E_temp[--i] = sbr.rate*border;
					}
				}
				break;
		}

		/* no error occured, we can safely use this t_E vector */
		for(l = 0; l<6; l++) {
			sbr.t_E[ch][l] = t_E_temp[l];
		}

		return 0;
	}
public static int envelope_time_border_vector(SBR sbr, int ch) {
		int l, border, temp;
		int[] t_E_temp = new int[6];

		t_E_temp[0] = sbr.rate*sbr.abs_bord_lead[ch];
		t_E_temp[sbr.L_E[ch]] = sbr.rate*sbr.abs_bord_trail[ch];

		switch(sbr.bs_frame_class[ch]) {
			case FIXFIX:
				switch(sbr.L_E[ch]) {
					case 4:
						temp = (sbr.numTimeSlots/4);
						t_E_temp[3] = sbr.rate*3*temp;
						t_E_temp[2] = sbr.rate*2*temp;
						t_E_temp[1] = sbr.rate*temp;
						break;
					case 2:
						t_E_temp[1] = sbr.rate*(sbr.numTimeSlots/2);
						break;
					default:
						break;
				}
				break;

			case FIXVAR:
				if(sbr.L_E[ch]>1) {
					int i = sbr.L_E[ch];
					border = sbr.abs_bord_trail[ch];

					for(l = 0; l<(sbr.L_E[ch]-1); l++) {
						if(border<sbr.bs_rel_bord[ch][l])
							return 1;

						border -= sbr.bs_rel_bord[ch][l];
						t_E_temp[--i] = sbr.rate*border;
					}
				}
				break;

			case VARFIX:
				if(sbr.L_E[ch]>1) {
					int i = 1;
					border = sbr.abs_bord_lead[ch];

					for(l = 0; l<(sbr.L_E[ch]-1); l++) {
						border += sbr.bs_rel_bord[ch][l];

						if(sbr.rate*border+sbr.tHFAdj>sbr.numTimeSlotsRate+sbr.tHFGen)
							return 1;

						t_E_temp[i++] = sbr.rate*border;
					}
				}
				break;

			case VARVAR:
				if(sbr.bs_num_rel_0[ch]!=0) {
					int i = 1;
					border = sbr.abs_bord_lead[ch];

					for(l = 0; l<sbr.bs_num_rel_0[ch]; l++) {
						border += sbr.bs_rel_bord_0[ch][l];

						if(sbr.rate*border+sbr.tHFAdj>sbr.numTimeSlotsRate+sbr.tHFGen)
							return 1;

						t_E_temp[i++] = sbr.rate*border;
					}
				}

				if(sbr.bs_num_rel_1[ch]!=0) {
					int i = sbr.L_E[ch];
					border = sbr.abs_bord_trail[ch];

					for(l = 0; l<sbr.bs_num_rel_1[ch]; l++) {
						if(border<sbr.bs_rel_bord_1[ch][l])
							return 1;

						border -= sbr.bs_rel_bord_1[ch][l];
						t_E_temp[--i] = sbr.rate*border;
					}
				}
				break;
		}

		/* no error occured, we can safely use this t_E vector */
		for(l = 0; l<6; l++) {
			sbr.t_E[ch][l] = t_E_temp[l];
		}

		return 0;
	}
/* first build into temp vector to be able to use previous vector on error