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package arithmetic
import (
"fmt"
"strings"
)
// DecoderStats is the structure that contains arithmetic decode context.
type DecoderStats struct {
index int32
contextSize int32
codingContextTable []byte
mps []byte
}
// NewStats creates new DecoderStats of size 'contextSize'.
func NewStats(contextSize int32, index int32) *DecoderStats {
return &DecoderStats{
index: index,
contextSize: contextSize,
codingContextTable: make([]byte, contextSize),
mps: make([]byte, contextSize),
}
}
// Copy copies the DecoderStats.
func (d *DecoderStats) Copy() *DecoderStats {
cp := &DecoderStats{
contextSize: d.contextSize,
codingContextTable: make([]byte, d.contextSize),
}
for i := 0; i < len(d.codingContextTable); i++ {
cp.codingContextTable[i] = d.codingContextTable[i]
}
return cp
}
// Overwrite overwrites the codingContextTable from new DecoderStats 'dNew'.
func (d *DecoderStats) Overwrite(dNew *DecoderStats) {
for i := 0; i < len(d.codingContextTable); i++ {
d.codingContextTable[i] = dNew.codingContextTable[i]
d.mps[i] = dNew.mps[i]
}
}
// Reset resets current decoder stats.
func (d *DecoderStats) Reset() {
for i := 0; i < len(d.codingContextTable); i++ {
d.codingContextTable[i] = 0
d.mps[i] = 0
}
}
// SetIndex sets current decoder stats 'index'.
func (d *DecoderStats) SetIndex(index int32) {
d.index = index
}
// String implements Stringer interface.
func (d *DecoderStats) String() string {
b := &strings.Builder{}
b.WriteString(fmt.Sprintf("Stats: %d\n", len(d.codingContextTable)))
for i, v := range d.codingContextTable {
if v != 0 {
b.WriteString(fmt.Sprintf("Not zero at: %d - %d\n", i, v))
}
}
return b.String()
}
func (d *DecoderStats) cx() byte {
return d.codingContextTable[d.index]
}
func (d *DecoderStats) getMps() byte {
return d.mps[d.index]
}
// setEntry sets the decoder stats coding context table with moreprobableSymbol.
func (d *DecoderStats) setEntry(value int) {
v := byte(value & 0x7f)
d.codingContextTable[d.index] = v
}
// toggleMps flips the bit in the actual more predictable index.
func (d *DecoderStats) toggleMps() {
d.mps[d.index] ^= 1
}
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