1 public class SideInfoBuffer {
4 * The frame buffer that holds the data for the current frame.
6 private final int[] framebuffer = new int[BUFFER_INT_SIZE];
9 * Maximum size of the frame buffer.
11 private static final int BUFFER_INT_SIZE = 433;
14 * Index into <code>framebuffer</code> where the next bits are retrieved.
16 private int wordpointer;
19 * Number (0-31, from MSB to LSB) of next bit for get_bits()
23 private int main_data_begin;
25 public int getMain_data_begin() {
26 return main_data_begin;
29 public void setMain_data_begin(int main_data_begin) {
30 this.main_data_begin = main_data_begin;
33 private final int bitmask[] = {
35 0x00000001, 0x00000003, 0x00000007, 0x0000000F, 0x0000001F,
36 0x0000003F, 0x0000007F, 0x000000FF, 0x000001FF, 0x000003FF,
37 0x000007FF, 0x00000FFF, 0x00001FFF, 0x00003FFF, 0x00007FFF,
38 0x0000FFFF, 0x0001FFFF };
40 public int get_bits(int number_of_bits) {
42 int sum = bitindex + number_of_bits;
43 // System.out.println("bitindex=" + bitindex + " wordpointer="
46 // There is a problem here, wordpointer could be -1 ?!
52 // all bits contained in *wordpointer
53 returnvalue = (framebuffer[wordpointer] >>> (32 - sum))
54 & bitmask[number_of_bits];
55 // returnvalue = (wordpointer[0] >> (32 - sum)) &
56 // bitmask[number_of_bits];
57 if ((bitindex += number_of_bits) == 32) {
59 wordpointer++; // added by me!
65 // ((short[])&returnvalue)[0] = ((short[])wordpointer + 1)[0];
66 // wordpointer++; // Added by me!
67 // ((short[])&returnvalue + 1)[0] = ((short[])wordpointer)[0];
68 int Right = (framebuffer[wordpointer] & 0x0000FFFF);
70 int Left = (framebuffer[wordpointer] & 0xFFFF0000);
71 returnvalue = ((Right << 16) & 0xFFFF0000)
72 | ((Left >>> 16) & 0x0000FFFF);
74 returnvalue >>>= 48 - sum; // returnvalue >>= 16 - (number_of_bits - (32
76 returnvalue &= bitmask[number_of_bits];
81 public void setBuffer(int idx, int value) {
82 framebuffer[idx] = value;