VC-1 Zigzag Tables

2006-10-25T00:28:51Z

Llchao:

''Part of [[Understanding VC-1]]''

'''ZigZag Tables'''

These tables are used in AC Coefficient Decode. They are selected based on the following factors:

* Progressive vs Interlaced
* Intra vs Inter
* Ac Prediction Parameters
** Prediction Direction
** ACPRED syntax element
* Profile
* Transform Type

----

<code>
const BYTE8 vc1_Inv_Intra_Normal_Scan [64] = /* Table 226 */
{
0, 8, 1, 2, 9, 16, 24, 17,
10, 3, 4, 11, 18, 25, 32, 40,
33, 48, 26, 19, 12, 5, 6, 13,
20, 27, 34, 41, 56, 49, 57, 42,
35, 28, 21, 14, 7, 15, 22, 29,
36, 43, 50, 58, 51, 59, 44, 37,
30, 23, 31, 38, 45, 52, 60, 53,
61, 46, 39, 47, 54, 62, 55, 63
};
</code>

<code>
const BYTE8 vc1_Inv_Intra_Horizontal_Scan [64] = /* Table 227 */
{
0, 1, 8, 2, 3, 9, 16, 24,
17, 10, 4, 5, 11, 18, 25, 32,
40, 48, 33, 26, 19, 12, 6, 7,
13, 20, 27, 34, 41, 56, 49, 57,
42, 35, 28, 21, 14, 15, 22, 29,
36, 43, 50, 58, 51, 44, 37, 30,
23, 31, 38, 45, 52, 59, 60, 53,
46, 39, 47, 54, 61, 62, 55, 63
};
</code>

<code>
const BYTE8 vc1_Inv_Intra_Vertical_Scan [64] = /* Table 228 */
{
0, 8, 16, 1, 24, 32, 40, 9,
2, 3, 10, 17, 25, 48, 56, 41,
33, 26, 18, 11, 4, 5, 12, 19,
27, 34, 49, 57, 50, 42, 35, 28,
20, 13, 6, 7, 14, 21, 29, 36,
43, 51, 58, 59, 52, 44, 37, 30,
22, 15, 23, 31, 38, 45, 60, 53,
46, 39, 47, 54, 61, 62, 55, 63
};
</code>

<code>
const BYTE8 vc1_Inv_Inter_8x8_Scan_Simple_Main_Profiles_Progressive_Advanced_Profile [64] = /* Table 229 */
{
0, 8, 1, 2, 9, 16, 24, 17,
10, 3, 4, 11, 18, 25, 32, 40,
48, 56, 41, 33, 26, 19, 12, 5,
6, 13, 20, 27, 34, 49, 57, 58,
50, 42, 35, 28, 21, 14, 7, 15,
22, 29, 36, 43, 51, 59, 60, 52,
44, 37, 30, 23, 31, 38, 45, 53,
61, 62, 54, 46, 39, 47, 55, 63
};
</code>
<code>
const BYTE8 vc1_Inv_Inter_8x4_Scan_Simple_Main_Profiles [32] = /* Table 230 */
{
0, 1, 2, 8, 3, 9, 10, 16,
4, 11, 17, 24, 18, 12, 5, 19,
25, 13, 20, 26, 27, 6, 21, 28,
14, 22, 29, 7, 30, 15, 23, 31
};
</code>
<code>
const BYTE8 vc1_Inv_Inter_4x8_Scan_Simple_Main_Profiles [32] = /* Table 231 */
{
0, 8, 1, 16,
9, 24, 17, 2,
32, 10, 25, 40,
18, 48, 33, 26,
56, 41, 34, 3,
49, 57, 11, 42,
19, 50, 27, 58,
35, 43, 51, 59
};
</code>
<code>
const BYTE8 vc1_Inv_Inter_4x4_Scan_Simple_Main_Profiles_Progressive_Advanced_Profile [16] = /* Table 232 */
{
0, 8, 16, 1,
9, 24, 17, 2,
10, 18, 25, 3,
11, 26, 19, 27
};
</code>
<code>
const BYTE8 vc1_Inv_Progressive_Inter_8x4_Scan_Advanced_Profile [32] = /* Table 233 */
{
0, 8, 1, 16, 2, 9, 10, 3,
24, 17, 4, 11, 18, 12, 5, 19,
25, 13, 20, 26, 27, 6, 21, 28,
14, 22, 29, 7, 30, 15, 23, 31
};
</code>
<code>
const BYTE8 vc1_Inv_Progressive_Inter_4x8_Scan_Advanced_Profile [32] = /* Table 234 */
{
0, 1, 8, 2,
9, 16, 17, 24,
10, 32, 25, 18,
40, 3, 33, 26,
48, 11, 56, 41,
34, 49, 57, 42,
19, 50, 27, 58,
35, 43, 51, 59
};
</code>
<code>
const BYTE8 vc1_Inv_Interlace_Inter_8x8_Scan_Advanced_Profile [64] = /* Table 235 */
{
0, 8, 1, 16, 24, 9, 2, 32,
40, 48, 56, 17, 10, 3, 25, 18,
11, 4, 33, 41, 49, 57, 26, 34,
42, 50, 58, 19, 12, 5, 27, 20,
13, 6, 35, 28, 21, 14, 7, 15,
22, 29, 36, 43, 51, 59, 60, 52,
44, 37, 30, 23, 31, 38, 45, 53,
61, 62, 54, 46, 39, 47, 55, 63
};
</code>
<code>
const BYTE8 vc1_Inv_Interlace_Inter_8x4_Scan_Advanced_Profile [32] = /* Table 236 */
{
0, 8, 16, 24, 1, 9, 2, 17,
25, 10, 3, 18, 26, 4, 11, 19,
12, 5, 13, 20, 27, 6, 21, 28,
14, 22, 29, 7, 30, 15, 23, 31
};
</code>
<code>
const BYTE8 vc1_Inv_Interlace_Inter_4x8_Scan_Advanced_Profile [32] = /* Table 237 */
{
0, 1, 2, 8,
16, 9, 24, 17,
10, 3, 32, 40,
48, 56, 25, 18,
33, 26, 41, 34,
49, 57, 11, 42,
19, 50, 27, 58,
35, 43, 51, 59
};
</code>
<code>
const BYTE8 vc1_Inv_Interlace_Inter_4x4_Scan_Advanced_Profile [16] = /* Table 238 */
{
0, 8, 16, 24,
1, 9, 17, 2,
25, 10, 18, 3,
26, 11, 19, 27
};
</code>

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VC-1 Zigzag Tables