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.
---
libavcodec/dcadata.h | 12 ++++++------
1 file changed, 6 insertions(+), 6 deletions(-)
diff --git a/libavcodec/dcadata.h b/libavcodec/dcadata.h
index 156a2c3..e6997bc 100644
--- a/libavcodec/dcadata.h
+++ b/libavcodec/dcadata.h
@@ -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
--
1.8.3.4 (Apple Git-47)
_______________________________________________
libav-devel mailing list
[email protected]
https://lists.libav.org/mailman/listinfo/libav-devel
