winamp/Src/f263/vlc.cpp

188 lines
4.8 KiB
C++
Raw Normal View History

2024-09-24 12:54:57 +00:00
#include "Decoder.h"
#include "vlc_table.h"
static int PRED_type_EP[] = {0,0,1,1,1,2,2,2,3,3};
static int QUANT_present_EP[] = {0,1,0,0,1,0,0,1,0,1};
static int CBP_present_EP[] = {1,1,0,1,1,0,1,1,1,1};
static VLCtab MBTYPEtabEP[] = {
{-1,0}, {9,8}, {8,7}, {8,7}, {7,6}, {7,6}, {7,6}, {7,6},
{4,5}, {4,5}, {4,5}, {4,5}, {4,5}, {4,5}, {4,5}, {4,5},
{5,5}, {5,5}, {5,5}, {5,5}, {5,5}, {5,5}, {5,5}, {5,5},
{6,5}, {6,5}, {6,5}, {6,5}, {6,5}, {6,5}, {6,5}, {6,5},
{1,3}, {1,3}, {1,3}, {1,3}, {1,3}, {1,3}, {1,3}, {1,3},
{1,3}, {1,3}, {1,3}, {1,3}, {1,3}, {1,3}, {1,3}, {1,3},
{1,3}, {1,3}, {1,3}, {1,3}, {1,3}, {1,3}, {1,3}, {1,3},
{1,3}, {1,3}, {1,3}, {1,3}, {1,3}, {1,3}, {1,3}, {1,3},
{2,3}, {2,3}, {2,3}, {2,3}, {2,3}, {2,3}, {2,3}, {2,3},
{2,3}, {2,3}, {2,3}, {2,3}, {2,3}, {2,3}, {2,3}, {2,3},
{2,3}, {2,3}, {2,3}, {2,3}, {2,3}, {2,3}, {2,3}, {2,3},
{2,3}, {2,3}, {2,3}, {2,3}, {2,3}, {2,3}, {2,3}, {2,3},
{3,3}, {3,3}, {3,3}, {3,3}, {3,3}, {3,3}, {3,3}, {3,3},
{3,3}, {3,3}, {3,3}, {3,3}, {3,3}, {3,3}, {3,3}, {3,3},
{3,3}, {3,3}, {3,3}, {3,3}, {3,3}, {3,3}, {3,3}, {3,3},
{3,3}, {3,3}, {3,3}, {3,3}, {3,3}, {3,3}, {3,3}, {3,3}
};
static int PRED_type_B[] = {0,0,1,1,1,2,2,2,3,3,3,4,4};
static int QUANT_present_B[] = {0,1,0,0,1,0,0,1,0,0,1,0,1};
static int CBPC_pattern_EI[] = {0,1,2,3,0,1,2,3,0,1,2,3,0,1,2,3};
static int CBP_present_B[] = {1,1,0,1,1,0,1,1,0,1,1,1,1};
static VLCtab MBTYPEtabB[] = {
{-1,0}, {12,7}, {11,6}, {11,6}, {10,5}, {10,5}, {10,5}, {10,5},
{1,4}, {1,4}, {1,4}, {1,4}, {1,4}, {1,4}, {1,4}, {1,4},
{8,5}, {8,5}, {8,5}, {8,5}, {9,5}, {9,5}, {9,5}, {9,5},
{4,5}, {4,5}, {4,5}, {4,5}, {7,5}, {7,5}, {7,5}, {7,5},
{5,3}, {5,3}, {5,3}, {5,3}, {5,3}, {5,3}, {5,3}, {5,3},
{5,3}, {5,3}, {5,3}, {5,3}, {5,3}, {5,3}, {5,3}, {5,3},
{6,3}, {6,3}, {6,3}, {6,3}, {6,3}, {6,3}, {6,3}, {6,3},
{6,3}, {6,3}, {6,3}, {6,3}, {6,3}, {6,3}, {6,3}, {6,3},
{2,3}, {2,3}, {2,3}, {2,3}, {2,3}, {2,3}, {2,3}, {2,3},
{2,3}, {2,3}, {2,3}, {2,3}, {2,3}, {2,3}, {2,3}, {2,3},
{3,3}, {3,3}, {3,3}, {3,3}, {3,3}, {3,3}, {3,3}, {3,3},
{3,3}, {3,3}, {3,3}, {3,3}, {3,3}, {3,3}, {3,3}, {3,3}
};
static int QUANT_present_EI[] = {0,0,0,0,1,1,1,1,0,0,0,0,1,1,1,1};
static VLCtab MBTYPEtabEI[] = {
{-1,0}, {8,8}, {5,7}, {5,7}, {6,7}, {6,7}, {7,7}, {7,7},
{-1,0}, {9,8}, {10,8}, {11,8}, {12,8}, {13,8}, {14,8}, {15,8},
{4,4}, {4,4}, {4,4}, {4,4}, {4,4}, {4,4}, {4,4}, {4,4},
{4,4}, {4,4}, {4,4}, {4,4}, {4,4}, {4,4}, {4,4}, {4,4},
{1,3}, {1,3}, {1,3}, {1,3}, {1,3}, {1,3}, {1,3}, {1,3},
{1,3}, {1,3}, {1,3}, {1,3}, {1,3}, {1,3}, {1,3}, {1,3},
{1,3}, {1,3}, {1,3}, {1,3}, {1,3}, {1,3}, {1,3}, {1,3},
{1,3}, {1,3}, {1,3}, {1,3}, {1,3}, {1,3}, {1,3}, {1,3},
{2,3}, {2,3}, {2,3}, {2,3}, {2,3}, {2,3}, {2,3}, {2,3},
{2,3}, {2,3}, {2,3}, {2,3}, {2,3}, {2,3}, {2,3}, {2,3},
{2,3}, {2,3}, {2,3}, {2,3}, {2,3}, {2,3}, {2,3}, {2,3},
{2,3}, {2,3}, {2,3}, {2,3}, {2,3}, {2,3}, {2,3}, {2,3},
{3,3}, {3,3}, {3,3}, {3,3}, {3,3}, {3,3}, {3,3}, {3,3},
{3,3}, {3,3}, {3,3}, {3,3}, {3,3}, {3,3}, {3,3}, {3,3},
{3,3}, {3,3}, {3,3}, {3,3}, {3,3}, {3,3}, {3,3}, {3,3},
{3,3}, {3,3}, {3,3}, {3,3}, {3,3}, {3,3}, {3,3}, {3,3}
};
static int PRED_type_EI[] = {1,1,1,1,1,1,1,1,3,3,3,3,3,3,3,3};
int Decoder::getTMNMV()
{
int code;
if (buffer.getbits1())
{
return 0;
}
if ((code = buffer.showbits(12))>=512)
{
code = (code>>8) - 2;
buffer.flushbits(TMNMVtab0[code].len);
return TMNMVtab0[code].val;
}
if (code>=128)
{
code = (code>>2) -32;
buffer.flushbits(TMNMVtab1[code].len);
return TMNMVtab1[code].val;
}
if ((code-=5)<0)
{
fault=1;
return 0;
}
buffer.flushbits(TMNMVtab2[code].len);
return TMNMVtab2[code].val;
}
int Decoder::getMCBPC()
{
int code;
code = buffer.showbits (13);
if (code >> 4 == 1)
{
/* macroblock stuffing */
buffer.flushbits (9);
return 255;
}
if (code == 0)
{
fault = 1;
return 0;
}
if (code >= 4096)
{
buffer.flushbits (1);
return 0;
}
if (code >= 16)
{
buffer.flushbits (MCBPCtab0[code >> 4].len);
return MCBPCtab0[code >> 4].val;
}
else
{
buffer.flushbits (MCBPCtab1[code - 8].len);
return MCBPCtab1[code - 8].val;
}
}
int Decoder::getMCBPCintra()
{
int code;
code = buffer.showbits(9);
if (code == 1) {
/* macroblock stuffing */
buffer.flushbits(9);
return 255;
}
if (code < 8) {
fault = 1;
return 0;
}
code >>= 3;
if (code>=32)
{
buffer.flushbits(1);
return 3;
}
buffer.flushbits(MCBPCtabintra[code].len);
return MCBPCtabintra[code].val;
}
int Decoder::getCBPY()
{
int code;
code = buffer.showbits(6);
if (code < 2) {
fault = 1;
return -1;
}
if (code>=48)
{
buffer.flushbits(2);
return 0;
}
buffer.flushbits(CBPYtab[code].len);
return CBPYtab[code].val;
}