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vulkan/ffv1: unify encode and decode get/put primitives

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This simply makes a get_rac/put_rac_internal variant that can be
reused.
This commit is contained in:
Lynne
2025-05-06 11:20:19 +02:00
parent 7576410af7
commit cb8f4b675d
1 changed files with 17 additions and 40 deletions
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57
libavcodec/vulkan/rangecoder.comp
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@ -95,26 +95,26 @@ void renorm_encoder(inout RangeCoder c)
}
#endif
void put_rac_direct(inout RangeCoder c, inout uint8_t state, bool bit)
void put_rac_internal(inout RangeCoder c, const int range1, bool bit)
{
int range1 = uint16_t((c.range * state) >> 8);
#ifdef DEBUG
if (state == 0)
debugPrintfEXT("Error: state is zero");
if (range1 >= c.range)
debugPrintfEXT("Error: range1 >= c.range");
if (range1 <= 0)
debugPrintfEXT("Error: range1 <= 0");
#endif
int diff = c.range - range1;
c.low += bit ? diff : 0;
c.range = bit ? range1 : diff;
int ranged = c.range - range1;
c.low += bit ? ranged : 0;
c.range = bit ? range1 : ranged;
if (expectEXT(c.range < 0x100, false))
renorm_encoder(c);
}
void put_rac_direct(inout RangeCoder c, inout uint8_t state, bool bit)
{
put_rac_internal(c, (c.range * state) >> 8, bit);
state = zero_one_state[(uint(bit) << 8) + state];
}
@ -126,21 +126,7 @@ void put_rac(inout RangeCoder c, uint64_t state, bool bit)
/* Equiprobable bit */
void put_rac_equi(inout RangeCoder c, bool bit)
{
int range1 = c.range >> 1;
#ifdef DEBUG
if (range1 >= c.range)
debugPrintfEXT("Error: range1 >= c.range");
if (range1 <= 0)
debugPrintfEXT("Error: range1 <= 0");
#endif
int diff = c.range - range1;
c.low += bit ? diff : 0;
c.range = bit ? range1 : diff;
if (expectEXT(c.range < 0x100, false))
renorm_encoder(c);
put_rac_internal(c, c.range >> 1, bit);
}
void put_rac_terminate(inout RangeCoder c)
@ -224,11 +210,9 @@ void refill(inout RangeCoder c)
}
}
bool get_rac_direct(inout RangeCoder c, inout uint8_t state)
bool get_rac_internal(inout RangeCoder c, const int range1)
{
int range1 = c.range * state >> 8;
int ranged = c.range - range1;
bool bit = c.low >= ranged;
c.low -= bit ? ranged : 0;
c.range = (bit ? 0 : ranged) + (bit ? range1 : 0);
@ -236,6 +220,12 @@ bool get_rac_direct(inout RangeCoder c, inout uint8_t state)
if (expectEXT(c.range < 0x100, false))
refill(c);
return bit;
}
bool get_rac_direct(inout RangeCoder c, inout uint8_t state)
{
bool bit = get_rac_internal(c, c.range * state >> 8);
state = zero_one_state[state + (bit ? 256 : 0)];
return bit;
}
@ -247,18 +237,5 @@ bool get_rac(inout RangeCoder c, uint64_t state)
bool get_rac_equi(inout RangeCoder c)
{
int range1 = c.range >> 1;
c.range -= range1;
bool bit = c.low >= c.range;
if (bit) {
c.low -= c.range;
c.range = range1;
}
if (expectEXT(c.range < 0x100, false))
refill(c);
return bit;
return get_rac_internal(c, c.range >> 1);
}