73 |
|
|
74 |
} MACROBLOCK; |
} MACROBLOCK; |
75 |
|
|
76 |
static __inline int8_t get_dc_scaler(int32_t quant, uint32_t lum) |
static __inline int8_t get_dc_scaler(uint32_t quant, uint32_t lum) |
77 |
{ |
{ |
78 |
int8_t dc_scaler; |
if(quant < 5) |
79 |
|
return 8; |
80 |
|
|
81 |
if(quant > 0 && quant < 5) { |
if(quant < 25 && !lum) |
82 |
dc_scaler = 8; |
return (quant + 13) / 2; |
|
return dc_scaler; |
|
|
} |
|
83 |
|
|
84 |
if(quant < 25 && !lum) { |
if(quant < 9) |
85 |
dc_scaler = (quant + 13) >> 1; |
return 2 * quant; |
|
return dc_scaler; |
|
|
} |
|
86 |
|
|
87 |
if(quant < 9) { |
if(quant < 25) |
88 |
dc_scaler = quant << 1; |
return quant + 8; |
|
return dc_scaler; |
|
|
} |
|
|
|
|
|
if(quant < 25) { |
|
|
dc_scaler = quant + 8; |
|
|
return dc_scaler; |
|
|
} |
|
89 |
|
|
90 |
if(lum) |
if(lum) |
91 |
dc_scaler = (quant << 1) - 16; |
return 2 * quant - 16; |
92 |
else |
else |
93 |
dc_scaler = quant - 6; |
return quant - 6; |
|
|
|
|
return dc_scaler; |
|
94 |
} |
} |
95 |
|
|
|
|
|
96 |
// useful macros |
// useful macros |
97 |
|
|
98 |
#define MIN(X, Y) ((X)<(Y)?(X):(Y)) |
#define MIN(X, Y) ((X)<(Y)?(X):(Y)) |