XINTRA8: Difference between revisions
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An XIntra8 frame (also known as a J-type frame or J-frame) is a type of frame similar to an [[I-frame]]. They are used in Microsoft's MPEG-4 variation codec [[WMV2]]/[[WMV8]] and the same coding method (with a different header) is used in [[WMV3]] Complex Profile under the name "X8". XIntra8 frames are a type of intra frame ([[spatial prediction]]). This is why they are said to be similar to I-frames, because both B-frames and P-frames use ''inter''-frame prediction ([[temporal prediction]]). XIntra8 frames operate on 8x8 pixel blocks. XIntra8 frame types are missing in WMV9. XIntra8 frames reportedly operate in 10 different modes ( | An XIntra8 frame (also known as a J-type frame or J-frame) is a type of frame similar to an [[I-frame]]. They are used in Microsoft's MPEG-4 variation codec [[WMV2]]/[[WMV8]] and the same coding method (with a different header) is used in [[WMV3]] Complex Profile under the name "X8". XIntra8 frames are a type of intra frame ([[spatial prediction]]). This is why they are said to be similar to I-frames, because both B-frames and P-frames use ''inter''-frame prediction ([[temporal prediction]]). XIntra8 frames operate on 8x8 pixel blocks. XIntra8 frame types are missing in WMV9. XIntra8 frames reportedly operate in 10 different modes (more information needed). | ||
[[MPlayer]] on x86 can play files containing these frames using a binary codec. | [[MPlayer]] on x86 can play files containing these frames using a binary codec. FFmpeg can also decode files containing Xintra8 frames, but those frames will be skipped. Xintra8 frames have not been reverse engineered, so there is no documentation available. If a stream contains Xintra8 frames the Xintra8 bit will be set in the stream's extradata. | ||
Note: J-frame is the notation used by FFmpeg developers. [[XMV]] SDK calls it XIntra8 frame and in WMV3 | Note: J-frame is the notation used by FFmpeg developers. The [[XMV]] SDK calls it XIntra8 frame and in WMV3 they are called Intra_X8. | ||
The main differences between XIntra8-frames and I-frames: | The main differences between XIntra8-frames and I-frames: | ||
# They are not derived from MPEG-4 standard. | # They are not derived from the MPEG-4 standard. | ||
# | # The picture is coded as blocks, ''not'' as macroblocks. | ||
# Each frame may use its own Huffman codes. | # Each frame may use its own [[Huffman]] codes. | ||
reference [http://keyj.s2000.ws/files/projects/videocomp.pdf] (in German) | |||
== Decoding == | == Decoding == | ||
| Line 27: | Line 27: | ||
=== Huffman Decoding === | === Huffman Decoding === | ||
When each type code is read first time, reader checks if VLC table is set. If not then it reads | When each type code is read for the first time, the reader checks if the VLC table is set. If not then it reads code lengths as nibbles and constructs a balanced tree from them. | ||
=== Block Decoding === | === Block Decoding === | ||
# Read "joint" code | # Read "joint" code. | ||
# Divide this code into two parts - DC value and block_coded bit | # Divide this code into two parts - DC value and block_coded bit. | ||
# If block is coded then decode coefficients | # If block is coded then decode coefficients. | ||
## Read code | ## Read code. | ||
## Split read code into vector (value, skip, last) | ## Split read code into vector (value, skip, last). | ||
## Skip ''skip'' coefficients and set coefficient value to ''value'' | ## Skip ''skip'' coefficients and set coefficient value to ''value''. | ||
## If ''last'' is true then end decoding | ## If ''last'' is true then end decoding. | ||
Decoding AC coefficient: | Decoding AC coefficient: | ||
| Line 75: | Line 75: | ||
=== Tables === | === Tables === | ||
Arrays with the | Arrays with the Huffman code lengths that WMV2 J-Frames use (not sure all are really used) in a sanitized form (decoder stores 2 per byte and with -1 offset). There are codes for values 0..11, 0..76 (these are used for AC decoding) and 0..33. | ||
<pre> | <pre> | ||
Huffman header: | |||
index for code table: depends on number of code tables for mode (1, 2 or 3 bits) | index for code table: depends on number of code tables for mode (1, 2 or 3 bits) | ||
Revision as of 08:03, 8 June 2007
An XIntra8 frame (also known as a J-type frame or J-frame) is a type of frame similar to an I-frame. They are used in Microsoft's MPEG-4 variation codec WMV2/WMV8 and the same coding method (with a different header) is used in WMV3 Complex Profile under the name "X8". XIntra8 frames are a type of intra frame (spatial prediction). This is why they are said to be similar to I-frames, because both B-frames and P-frames use inter-frame prediction (temporal prediction). XIntra8 frames operate on 8x8 pixel blocks. XIntra8 frame types are missing in WMV9. XIntra8 frames reportedly operate in 10 different modes (more information needed).
MPlayer on x86 can play files containing these frames using a binary codec. FFmpeg can also decode files containing Xintra8 frames, but those frames will be skipped. Xintra8 frames have not been reverse engineered, so there is no documentation available. If a stream contains Xintra8 frames the Xintra8 bit will be set in the stream's extradata.
Note: J-frame is the notation used by FFmpeg developers. The XMV SDK calls it XIntra8 frame and in WMV3 they are called Intra_X8.
The main differences between XIntra8-frames and I-frames:
- They are not derived from the MPEG-4 standard.
- The picture is coded as blocks, not as macroblocks.
- Each frame may use its own Huffman codes.
reference [1] (in German)
Decoding
Overall decoding process:
for(y = 0; y < blocks_height; y++){
for(x = 0; x < blocks_width; x++){
decode_block(luma, x, y);
if ((x & 1) && (y & 1)){
decode_block(chroma_u, x/2, y/2);
decode_block(chroma_v, x/2, y/2);
}
}
}
Huffman Decoding
When each type code is read for the first time, the reader checks if the VLC table is set. If not then it reads code lengths as nibbles and constructs a balanced tree from them.
Block Decoding
- Read "joint" code.
- Divide this code into two parts - DC value and block_coded bit.
- If block is coded then decode coefficients.
- Read code.
- Split read code into vector (value, skip, last).
- Skip skip coefficients and set coefficient value to value.
- If last is true then end decoding.
Decoding AC coefficient:
vlc = read_vlc();
base = some_table[vlc];
if(!base) base = read_vlc();
vlc = 0..15: skip = 0; value = vlc; last = 0;
vlc = 16..19: skip = 1; value = vlc-16; last = 0;
vlc = 20..21: skip = 2; value = vlc-20; last = 0;
vlc = 22: skip = 3; value = 0; last = 0;
vlc = 23..38: skip = 0; value = vlc-23; last = 1;
vlc = 39..42: skip = 1; value = vlc-39; last = 1;
vlc = 43..44: skip = 2; value = vlc-43; last = 1;
vlc = 45: skip = 3; value = 0; last = 1;
vlc = 46..47: skip = 0; value = Off0[vlc-46]+base; last = 0;
vlc = 48..49: skip = 1; value = Off0[vlc-46]+base; last = 0;
vlc = 50: skip = 0; value = Off0[vlc-46]+base; last = 0;
vlc = 51: skip = 1; value = Off0[vlc-46]+base; last = 0;
vlc = 52..56: skip = 0; value = Off0[vlc-46]+base; last = 0;
vlc = 57..58: skip = 0; value = Off0[vlc-46]+base; last = 0;
vlc = 59..64: skip = 0; value = Off1[vlc-59]+base; last = 1;
vlc = 65..67: skip = 1; value = Off1[vlc-59]+base; last = 1;
vlc = 68..70: skip = 0; value = Off1[vlc-59]+base; last = 1;
vlc = 71..72: skip = 1; value = Off1[vlc-59]+base; last = 1;
vlc = 73..74:
code = base & 3;
base >>= 2;
switch(code){
case 0: skip = 2; value = base + 2;
case 1: skip = 2; value = base + 3;
case 2: skip = (base & 1)+3; value = (base>>1) + 3;
case 3: skip = (base & 3)+5; value = (base>>2) + 3;
}
last = vlc - 73;
else: skip = base>>7; value = (base>>1) & 0x3F; last = base & 1;
Tables
Arrays with the Huffman code lengths that WMV2 J-Frames use (not sure all are really used) in a sanitized form (decoder stores 2 per byte and with -1 offset). There are codes for values 0..11, 0..76 (these are used for AC decoding) and 0..33.
Huffman header:
index for code table: depends on number of code tables for mode (1, 2 or 3 bits)
gacCodeLengthsOrientLowRate[][] = {
{2, 2, 3, 3, 3, 6, 5, 6, 6, 6, 6, 6},
{1, 2, 3, 5, 5, 7, 6, 7, 7, 7, 7, 7}
};
gacCodeLengthsOrientHighRate[][] = {
{1, 3, 3, 4, 4, 6, 5, 6, 6, 6, 6, 6},
{5, 5, 5, 2, 2, 4, 5, 3, 4, 4, 5, 5},
{2, 2, 3, 3, 3, 6, 6, 5, 6, 6, 6, 6},
{3, 4, 4, 2, 2, 5, 5, 4, 5, 5, 5, 5}
};
gacCodeLengthsInterLowRate[][] = {
{
3, 4, 6, 6, 7, 6, 15, 8, 15, 9, 15, 9, 15, 15, 15, 14,
5, 6, 9, 9, 7, 7, 9, 2, 3, 4, 4, 5, 6, 8, 7, 6,
7, 8, 14, 7, 7, 7, 9, 5, 6, 9, 8, 9, 9, 14, 14, 14,
8, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 9, 14, 14, 14, 14,
14, 14, 9, 14, 9, 14, 14, 14, 14, 9, 14, 14, 14
},{
3, 4, 4, 5, 6, 6, 6, 6, 7, 8, 8, 8, 8, 14, 10, 10,
4, 5, 6, 7, 5, 6, 5, 4, 5, 5, 6, 6, 6, 6, 6, 7,
8, 8, 7, 7, 7, 7, 8, 7, 7, 8, 8, 8, 14, 10, 9, 14,
5, 9, 14, 14, 5, 8, 14, 14, 14, 6, 8, 7, 8, 9, 8, 14,
14, 8, 9, 14, 14, 14, 14, 9, 14, 5, 8, 9, 14
},{
4, 5, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 11, 11, 11, 11,
11, 11, 11, 11, 11, 11, 11, 1, 2, 5, 5, 5, 11, 11, 11, 11,
11, 11, 11, 11, 11, 11, 11, 5, 11, 11, 11, 11, 11, 11, 11, 11,
11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11,
11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11
},{
8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8,
8, 8, 8, 8, 8, 8, 8, 1, 8, 7, 7, 7, 7, 7, 7, 7,
7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7,
7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7,
7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7
},{
9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9,
9, 9, 9, 9, 9, 9, 8, 2, 1, 8, 8, 8, 8, 8, 8, 8,
8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8,
8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8,
8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8
},{
10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10,
10, 10, 10, 10, 9, 9, 9, 1, 3, 9, 9, 2, 9, 9, 9, 9,
9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9,
9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9,
9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9
},{
2, 4, 5, 5, 6, 6, 7, 8, 8, 8, 9, 9, 10, 9, 10, 15,
3, 5, 6, 6, 4, 7, 5, 5, 7, 7, 7, 8, 7, 7, 8, 8,
8, 8, 8, 8, 8, 9, 8, 8, 8, 9, 15, 10, 10, 10, 15, 10,
6, 9, 15, 15, 4, 6, 10, 15, 14, 6, 8, 14, 10, 14, 14, 14,
14, 8, 10, 10, 14, 14, 14, 14, 14, 5, 10, 14, 14
},{
3, 4, 5, 5, 6, 8, 7, 6, 7, 13, 8, 8, 13, 13, 13, 8,
4, 5, 7, 6, 6, 7, 6, 3, 5, 5, 4, 6, 6, 6, 5, 8,
6, 6, 6, 6, 8, 8, 7, 5, 7, 7, 13, 7, 8, 13, 13, 13,
7, 7, 13, 13, 8, 13, 13, 13, 13, 8, 13, 7, 8, 13, 13, 13,
13, 8, 13, 13, 13, 13, 13, 8, 12, 6, 12, 12, 12
}
};
gacCodeLengthsInterHighRate[][] = {
{
2, 3, 4, 5, 6, 7, 7, 7, 9, 8, 8, 8, 10, 10, 10, 10,
4, 7, 9, 10, 6, 7, 7, 4, 4, 5, 5, 5, 6, 6, 6, 6,
7, 7, 7, 7, 7, 7, 7, 8, 9, 10, 14, 14, 14, 14, 10, 14,
9, 14, 14, 14, 8, 14, 14, 14, 14, 10, 14, 7, 8, 8, 9, 14,
14, 14, 14, 14, 14, 14, 14, 14, 13, 13, 13, 13, 13
},{
3, 5, 7, 6, 6, 8, 8, 8, 14, 14, 7, 14, 14, 14, 14, 14,
6, 8, 14, 8, 14, 14, 14, 2, 3, 5, 4, 4, 4, 6, 7, 7,
7, 7, 8, 7, 6, 6, 6, 6, 8, 14, 8, 8, 8, 14, 14, 14,
8, 14, 14, 14, 13, 13, 13, 13, 13, 13, 13, 6, 13, 13, 13, 13,
13, 7, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13
},{
2, 3, 3, 4, 5, 5, 6, 6, 7, 7, 7, 8, 8, 8, 9, 10,
4, 6, 8, 9, 6, 9, 8, 5, 6, 6, 6, 7, 7, 7, 7, 7,
7, 7, 7, 7, 7, 7, 8, 16, 16, 15, 12, 15, 15, 15, 8, 10,
9, 12, 15, 15, 8, 15, 15, 15, 15, 9, 15, 7, 8, 8, 11, 12,
15, 15, 15, 15, 15, 15, 15, 15, 15, 9, 15, 15, 15
},{
2, 3, 4, 5, 5, 6, 6, 7, 7, 8, 8, 9, 9, 9, 10, 10,
3, 5, 7, 7, 4, 7, 5, 6, 7, 7, 7, 8, 8, 8, 8, 8,
8, 9, 8, 8, 8, 9, 11, 10, 11, 15, 10, 15, 15, 15, 9, 11,
7, 12, 15, 15, 5, 7, 8, 10, 11, 7, 10, 8, 8, 10, 10, 12,
15, 11, 15, 15, 15, 15, 15, 15, 15, 7, 14, 12, 12
},{
3, 4, 4, 5, 6, 6, 6, 7, 6, 7, 8, 8, 8, 9, 9, 8,
4, 5, 6, 6, 4, 6, 5, 5, 6, 6, 6, 6, 6, 6, 6, 7,
7, 7, 7, 7, 7, 8, 11, 7, 7, 8, 9, 9, 9, 10, 9, 10,
6, 8, 15, 15, 4, 7, 9, 15, 15, 6, 10, 7, 8, 8, 10, 9,
15, 9, 10, 10, 10, 15, 14, 14, 14, 5, 9, 14, 14
},{
2, 4, 5, 5, 6, 6, 7, 8, 8, 8, 9, 11, 8, 10, 11, 15,
3, 5, 6, 7, 4, 6, 5, 6, 7, 8, 7, 8, 7, 8, 7, 8,
8, 9, 9, 9, 9, 9, 11, 9, 10, 11, 15, 10, 11, 11, 10, 11,
6, 8, 15, 15, 4, 5, 7, 7, 9, 6, 8, 8, 10, 11, 15, 10,
15, 10, 10, 15, 15, 14, 14, 14, 14, 5, 10, 11, 9
},{
2, 4, 5, 6, 6, 8, 9, 10, 10, 9, 15, 15, 10, 15, 10, 15,
4, 5, 8, 8, 5, 9, 8, 3, 3, 4, 5, 6, 6, 7, 7, 7,
8, 8, 9, 8, 10, 15, 9, 6, 6, 9, 10, 8, 8, 10, 15, 15,
9, 15, 15, 15, 8, 15, 15, 15, 15, 9, 15, 9, 15, 15, 15, 15,
15, 10, 10, 15, 15, 15, 15, 15, 15, 8, 14, 14, 14
},{
4, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11,
11, 10, 10, 10, 10, 10, 10, 1, 2, 10, 4, 4, 10, 10, 10, 10,
10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10,
10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10,
10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10
}
};
gacCodeLengthsIntraLowRate[][] = {
3, 4, 5, 5, 5, 5, 6, 7, 6, 7, 8, 7, 7, 8, 8, 9,
4, 6, 6, 7, 5, 8, 6, 4, 4, 5, 6, 6, 6, 6, 7, 7,
7, 7, 7, 7, 7, 7, 7, 7, 7, 9, 9, 9, 11, 9, 6, 8,
5, 7, 9, 9, 7, 10, 14, 14, 14, 7, 10, 7, 8, 9, 8, 7,
14, 7, 7, 10, 10, 14, 14, 10, 14, 6, 9, 8, 14
},{
2, 4, 5, 5, 6, 7, 7, 7, 8, 9, 9, 9, 9, 15, 10, 11,
3, 5, 6, 7, 4, 5, 4, 6, 7, 7, 8, 8, 7, 8, 9, 8,
9, 9, 9, 9, 10, 11, 11, 9, 9, 11, 15, 10, 15, 15, 15, 15,
6, 8, 15, 15, 4, 7, 8, 11, 15, 5, 8, 11, 10, 15, 15, 15,
15, 9, 15, 14, 14, 14, 14, 14, 14, 5, 14, 14, 14
},{
3, 4, 4, 5, 6, 7, 6, 7, 9, 9, 8, 15, 9, 15, 15, 15,
3, 5, 7, 7, 4, 6, 5, 4, 4, 5, 6, 6, 6, 6, 7, 8,
7, 8, 10, 8, 9, 10, 10, 6, 7, 9, 9, 8, 10, 9, 15, 15,
7, 9, 15, 15, 5, 8, 14, 14, 14, 6, 9, 9, 10, 10, 14, 14,
14, 8, 14, 14, 10, 14, 14, 9, 14, 6, 8, 9, 14
},{
3, 4, 5, 5, 6, 6, 7, 7, 6, 6, 7, 7, 9, 9, 7, 8,
5, 6, 9, 7, 6, 7, 7, 3, 3, 5, 5, 6, 6, 6, 7, 7,
8, 8, 8, 8, 7, 6, 7, 7, 6, 8, 9, 14, 14, 14, 7, 9,
7, 8, 14, 14, 8, 14, 13, 13, 13, 8, 13, 6, 7, 9, 6, 7,
13, 7, 7, 13, 13, 13, 13, 13, 13, 8, 13, 9, 13
},{
2, 4, 5, 5, 6, 6, 7, 7, 7, 8, 9, 9, 10, 10, 10, 15,
3, 5, 6, 7, 4, 6, 6, 4, 5, 6, 6, 6, 7, 7, 7, 7,
8, 8, 8, 8, 8, 8, 10, 7, 8, 9, 9, 10, 10, 12, 10, 12,
6, 8, 15, 15, 6, 9, 15, 15, 15, 7, 12, 10, 10, 15, 12, 11,
15, 8, 9, 15, 12, 15, 15, 15, 14, 6, 12, 11, 14
},{
3, 4, 4, 5, 5, 6, 7, 8, 11, 9, 11, 10, 11, 15, 15, 15,
4, 5, 6, 7, 5, 7, 6, 3, 4, 5, 5, 5, 5, 6, 6, 7,
8, 8, 8, 7, 8, 9, 11, 5, 7, 8, 8, 7, 10, 9, 9, 15,
7, 15, 15, 15, 7, 11, 15, 14, 14, 7, 14, 9, 10, 10, 9, 14,
14, 8, 11, 14, 14, 14, 14, 9, 14, 7, 9, 14, 14
},{
3, 4, 4, 5, 5, 5, 5, 6, 7, 5, 7, 13, 7, 13, 7, 13,
4, 6, 7, 7, 5, 7, 5, 6, 6, 7, 6, 7, 7, 13, 7, 7,
13, 13, 12, 7, 7, 12, 12, 7, 12, 12, 12, 12, 12, 12, 5, 6,
4, 5, 12, 7, 5, 12, 12, 12, 12, 6, 12, 6, 12, 12, 12, 12,
12, 6, 12, 12, 12, 12, 12, 12, 12, 5, 12, 7, 12
},{
3, 4, 5, 6, 6, 8, 8, 8, 11, 15, 15, 15, 15, 15, 15, 15,
4, 6, 7, 9, 5, 8, 8, 2, 3, 5, 5, 5, 6, 6, 8, 8,
9, 8, 7, 8, 9, 11, 15, 5, 7, 8, 9, 8, 9, 9, 15, 15,
8, 10, 15, 15, 8, 15, 15, 15, 15, 9, 15, 8, 9, 15, 15, 15,
15, 9, 15, 15, 15, 15, 15, 10, 14, 7, 9, 14, 14
}
};
gacCodeLengthsIntraHighRate[][] = {
{
3, 4, 4, 5, 6, 7, 6, 8, 8, 9, 10, 9, 9, 9, 15, 11,
4, 5, 6, 7, 5, 7, 5, 3, 4, 5, 5, 5, 5, 6, 6, 7,
8, 8, 8, 8, 8, 9, 10, 6, 7, 8, 8, 8, 11, 10, 11, 15,
7, 14, 14, 14, 6, 10, 14, 14, 14, 7, 14, 8, 9, 11, 10, 11,
14, 8, 10, 14, 14, 14, 14, 14, 14, 6, 9, 11, 14
},{
2, 3, 4, 5, 6, 6, 7, 8, 8, 8, 9, 9, 11, 11, 11, 11,
3, 5, 6, 7, 4, 6, 4, 8, 9, 10, 9, 10, 10, 12, 10, 10,
10, 10, 11, 12, 10, 12, 12, 15, 15, 15, 15, 14, 14, 14, 11, 11,
8, 10, 12, 14, 4, 6, 7, 8, 10, 6, 8, 11, 10, 14, 11, 12,
14, 14, 14, 14, 14, 14, 14, 14, 14, 6, 11, 11, 10
},{
3, 4, 5, 6, 7, 8, 8, 8, 10, 9, 10, 10, 16, 10, 10, 16,
3, 5, 6, 8, 3, 5, 4, 7, 9, 9, 9, 9, 9, 10, 10, 10,
10, 10, 10, 9, 10, 11, 16, 10, 11, 10, 11, 10, 16, 11, 15, 15,
7, 9, 15, 15, 3, 4, 6, 6, 8, 5, 7, 15, 15, 15, 15, 11,
15, 11, 11, 11, 15, 15, 15, 15, 15, 5, 11, 8, 8
},{
2, 3, 4, 4, 5, 5, 6, 6, 6, 6, 7, 7, 8, 8, 8, 9,
4, 6, 7, 9, 6, 8, 7, 6, 6, 6, 6, 6, 7, 7, 7, 7,
7, 7, 7, 7, 8, 8, 9, 11, 10, 15, 15, 15, 15, 15, 7, 8,
8, 12, 9, 15, 7, 9, 15, 15, 15, 8, 11, 6, 7, 8, 8, 7,
9, 11, 11, 15, 15, 15, 14, 14, 14, 8, 14, 14, 14
},{
2, 4, 5, 6, 6, 7, 7, 8, 8, 8, 9, 9, 10, 10, 14, 12,
3, 5, 6, 7, 4, 6, 5, 5, 6, 6, 6, 7, 7, 8, 7, 8,
8, 8, 8, 8, 9, 10, 10, 7, 8, 9, 9, 10, 11, 9, 9, 10,
7, 8, 12, 12, 4, 6, 8, 8, 9, 6, 8, 9, 10, 10, 11, 10,
11, 9, 9, 11, 11, 14, 14, 11, 14, 6, 9, 9, 10
},{
2, 3, 4, 5, 5, 6, 6, 7, 7, 7, 8, 8, 8, 9, 10, 9,
3, 5, 7, 8, 5, 7, 6, 5, 6, 7, 7, 7, 8, 8, 7, 8,
8, 8, 8, 8, 8, 9, 9, 11, 12, 12, 15, 13, 15, 15, 8, 9,
8, 10, 9, 13, 5, 7, 9, 9, 15, 7, 11, 8, 8, 8, 9, 8,
11, 12, 13, 15, 15, 15, 15, 15, 15, 7, 14, 11, 11
},{
3, 4, 4, 5, 5, 6, 6, 7, 8, 8, 8, 9, 9, 9, 11, 12,
3, 5, 6, 7, 4, 6, 5, 4, 5, 6, 6, 7, 7, 7, 7, 7,
7, 8, 8, 8, 9, 8, 10, 7, 8, 9, 11, 9, 10, 12, 9, 15,
6, 7, 15, 15, 5, 7, 9, 11, 15, 6, 9, 8, 9, 10, 10, 11,
15, 8, 9, 15, 15, 15, 14, 14, 14, 5, 10, 9, 14
},{
2, 4, 5, 6, 7, 7, 8, 8, 9, 9, 9, 10, 15, 15, 15, 15,
3, 5, 6, 7, 4, 6, 4, 8, 8, 9, 10, 9, 10, 9, 10, 10,
15, 10, 11, 11, 15, 10, 15, 9, 11, 15, 15, 11, 11, 15, 11, 15,
7, 10, 15, 15, 3, 5, 7, 7, 9, 5, 7, 9, 11, 15, 14, 14,
14, 9, 9, 14, 14, 14, 14, 14, 14, 5, 11, 8, 10
}
};
gacCodeLengthsDCLowRate[][] = {
{ 5, 4, 4, 5, 5, 4, 5, 5, 7, 7, 12, 12, 12, 12, 12, 12, 12,
3, 2, 3, 4, 5, 5, 7, 8, 12, 12, 12, 12, 12, 12, 12, 12, 12 },
{ 3, 3, 3, 4, 4, 3, 4, 4, 6, 7, 7, 11, 11, 11, 11, 11, 11,
6, 4, 5, 5, 6, 5, 7, 7, 11, 7, 11, 11, 11, 11, 11, 10, 10 },
{ 7, 7, 6, 7, 6, 7, 8, 8, 13, 13, 13, 13, 13, 13, 13, 13, 12,
1, 2, 3, 5, 6, 8, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12 },
{ 4, 3, 3, 4, 4, 3, 3, 3, 5, 5, 7, 11, 11, 11, 11, 11, 11,
5, 7, 6, 6, 7, 7, 7, 7, 11, 11, 11, 7, 11, 11, 11, 10, 10 },
{ 8, 7, 7, 7, 9, 8, 9, 14, 14, 14, 14, 14, 14, 14, 14, 13, 13,
2, 1, 3, 4, 6, 7, 9, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13 },
{ 7, 7, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6,
6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 1, 6, 6, 6, 6, 6, 6 },
{ 5, 4, 5, 5, 6, 5, 6, 6, 8, 8, 13, 13, 13, 13, 13, 13, 13,
2, 2, 3, 4, 5, 5, 8, 9, 13, 13, 13, 13, 13, 13, 13, 13, 13 },
{ 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7,
1, 2, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7 }
};
gacCodeLengthsDCHighRate[][] = {
{ 5, 4, 5, 5, 5, 5, 6, 6, 8, 8, 13, 13, 13, 13, 13, 13, 13,
2, 2, 3, 4, 5, 6, 8, 9, 13, 13, 13, 13, 13, 13, 13, 13, 13 },
{ 4, 3, 3, 4, 4, 3, 4, 3, 4, 4, 5, 6, 9, 9, 13, 13, 13,
6, 6, 6, 7, 9, 7, 8, 9, 13, 13, 13, 12, 12, 9, 12, 12, 12 },
{ 4, 3, 3, 4, 4, 4, 4, 4, 6, 6, 7, 7, 12, 12, 12, 12, 12,
4, 3, 4, 5, 6, 6, 7, 8, 12, 12, 12, 12, 12, 12, 12, 11, 11 },
{ 4, 2, 3, 3, 3, 3, 4, 4, 6, 6, 7, 8, 14, 14, 14, 14, 13,
9, 7, 8, 8, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13 },
{ 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7,
1, 2, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7 },
{ 5, 4, 5, 6, 6, 6, 7, 6, 7, 6, 8, 7, 8, 13, 13, 13, 13,
3, 1, 3, 7, 8, 9, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 12 },
{ 4, 2, 3, 3, 4, 4, 5, 6, 7, 7, 8, 14, 14, 10, 9, 14, 14,
4, 3, 5, 6, 8, 8, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 13 },
{ 6, 6, 6, 7, 7, 6, 6, 6, 7, 8, 8, 9, 10, 14, 14, 14, 14,
1, 2, 4, 5, 6, 7, 8, 14, 14, 14, 14, 14, 14, 14, 14, 13, 13 }
};
ReconstructionLevels[64] = {
256,256,256,256,256,256,259,262,
265,269,272,275,278,282,285,288,
292,295,299,303,306,310,314,317,
321,325,329,333,337,341,345,349,
353,358,362,366,371,375,379,384,
389,393,398,403,408,413,417,422,
428,433,438,443,448,454,459,465,
470,476,482,488,493,499,505,511,
};