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Offset AR coefficients to get the AV1 range #116

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Offset AR coefficients to get the AV1 range #116

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6 changes: 3 additions & 3 deletions 07.bitstream.semantics.md
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Original file line number Diff line number Diff line change
Expand Up @@ -536,7 +536,7 @@ luma and chroma.
The values of auto-regressive coefficients plus 128 for the luma component ArCoeffsYPlus128[ i ] are derived as follows
~~~~~ c
for ( i = 0; i < numPosLuma; i++ )
ArCoeffsYPlus128[ i ] = ar_coeffs_y[ i ] - (1<<(BitsArY - 1)).
ArCoeffsYPlus128[ i ] = ar_coeffs_y[ i ] - (1<<(BitsArY - 1)) + 128.
~~~~~

**bits_per_ar_coeff_cb_minus5** plus 5 specifies the number of bits used to signal ar_coeffs_cb[ i ].
Expand All @@ -546,7 +546,7 @@ for ( i = 0; i < numPosLuma; i++ )
The values of the auto-regressive coefficients plus 128 for the Cb component ArCoeffsCbPlus128[ i ] are derived as follows:
~~~~~ c
for ( i = 0; i < numPosChroma; i++ )
ArCoeffsCbPlus128[ i ] = ar_coeffs_cb[ i ] - (1<<(BitsArCb - 1)).
ArCoeffsCbPlus128[ i ] = ar_coeffs_cb[ i ] - (1<<(BitsArCb - 1)) + 128.
~~~~~

**bits_per_ar_coeff_cr_minus5** plus 5 specifies the number of bits used to signal ar_coeffs_cr[ i ].
Expand All @@ -556,7 +556,7 @@ for ( i = 0; i < numPosChroma; i++ )
The values of the auto-regressive coefficients plus 128 for the Cr component ArCoeffsCrPlus128[ i ] are derived as follows:
~~~~~ c
for ( i = 0; i < numPosChroma; i++ )
ArCoeffsCrPlus128[ i ] = ar_coeffs_cr[ i ] - (1<<(BitsArCr - 1)).
ArCoeffsCrPlus128[ i ] = ar_coeffs_cr[ i ] - (1<<(BitsArCr - 1)) + 128.
~~~~~

**ar_coeff_shift_minus6** specifies the range of the auto-regressive coefficients. Values of 0, 1, 2, and 3
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