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dca: improve default stereo downmix coefficients.

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Previous coefficients were producing a non-normalized, incorrect Lt/Rt downmix.

The new coefficients produce a standard Lo/Ro downmix with 3dB attenuation.

This should match the typical default coefficients used by DTS encoders.

Signed-off-by: Anton Khirnov <anton@khirnov.net>
pull/49/head
Tim Walker 11 years ago committed by Anton Khirnov
parent 44b17d794a
commit 149438cfe5
1 changed files with 6 additions and 6 deletions
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  1. 12
      libavcodec/dcadata.h

12
libavcodec/dcadata.h
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@ -7552,16 +7552,16 @@ static const float dca_dmixtable[241] = {
};
static const float dca_default_coeffs[10][5][2] = {
{ { 0.707946, 0.707946 }, }, // A
{ { 0.707107, 0.707107 }, }, // A
{ { 1.000000, 0.000000 }, { 0.000000, 1.000000 }, }, // A + B (dual mono)
{ { 1.000000, 0.000000 }, { 0.000000, 1.000000 }, }, // L + R (stereo)
{ { 1.000000, 0.000000 }, { 0.000000, 1.000000 }, }, // (L+R) + (L-R) (sum-difference)
{ { 1.000000, 0.000000 }, { 0.000000, 1.000000 }, }, // LT + RT (left and right total)
{ { 0.865964, 0.865964 }, { 1.000000, 0.501187 }, { 0.501187, 1.000000 }, }, // C + L + R
{ { 1.000000, 0.501187 }, { 0.501187, 1.000000 }, { 0.707946, 0.707946 }, }, // L + R + S
{ { 0.865964, 0.865964 }, { 1.000000, 0.501187 }, { 0.501187, 1.000000 }, { 0.707946, 0.707946 }, }, // C + L + R + S
{ { 1.000000, 0.501187 }, { 0.501187, 1.000000 }, { 1.000000, 0.707946 }, { 0.707946, 1.000000 }, }, // L + R + SL + SR
{ { 0.865964, 0.865964 }, { 1.000000, 0.501187 }, { 0.501187, 1.000000 }, { 1.000000, 0.707946 }, { 0.707946, 1.000000 }, }, // C + L + R + SL + SR
{ { 0.501187, 0.501187 }, { 0.707107, 0.000000 }, { 0.000000, 0.707107 }, }, // C + L + R
{ { 0.707107, 0.000000 }, { 0.000000, 0.707107 }, { 0.501187, 0.501187 }, }, // L + R + S
{ { 0.501187, 0.501187 }, { 0.707107, 0.000000 }, { 0.000000, 0.707107 }, { 0.501187, 0.501187 }, }, // C + L + R + S
{ { 0.707107, 0.000000 }, { 0.000000, 0.707107 }, { 0.501187, 0.000000 }, { 0.000000, 0.501187 }, }, // L + R + SL + SR
{ { 0.501187, 0.501187 }, { 0.707107, 0.000000 }, { 0.000000, 0.707107 }, { 0.501187, 0.000000 }, { 0.000000, 0.501187 }, }, // C + L + R + SL + SR
};
/* downmix coeffs

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