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TAD: more tuning

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minjaesong
2025-11-07 10:51:01 +09:00
parent d9d395c62c
commit e743fbf3c0
2 changed files with 6 additions and 6 deletions
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6
video_encoder/decoder_tad.c
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@@ -31,7 +31,7 @@ static const float BASE_QUANTISER_WEIGHTS[2][10] = {
1.0f, // H (L4) 1 khz
1.0f, // H (L3) 2 khz
1.3f, // H (L2) 4 khz
1.8f // H (L1) 8 khz
2.0f // H (L1) 8 khz
},
{ // side channel
6.0f, // LL (L9) DC
@@ -380,9 +380,9 @@ static void expand_gamma(float *left, float *right, size_t count) {
for (size_t i = 0; i < count; i++) {
// decode(y) = sign(y) * |y|^(1/γ) where γ=0.5
float x = left[i]; float a = fabsf(x);
left[i] = signum(x) * powf(a, 1.4142f);
left[i] = signum(x) * powf(a, 1.6f);
float y = right[i]; float b = fabsf(y);
right[i] = signum(y) * powf(b, 1.4142f);
right[i] = signum(y) * powf(b, 1.6f);
}
}

6
video_encoder/encoder_tad.c
View File

@@ -31,7 +31,7 @@ static const float BASE_QUANTISER_WEIGHTS[2][10] = {
1.0f, // H (L4) 1 khz
1.0f, // H (L3) 2 khz
1.3f, // H (L2) 4 khz
1.8f // H (L1) 8 khz
2.0f // H (L1) 8 khz
},
{ // side channel
6.0f, // LL (L9) DC
@@ -229,9 +229,9 @@ static void compress_gamma(float *left, float *right, size_t count) {
for (size_t i = 0; i < count; i++) {
// encode(x) = sign(x) * |x|^γ where γ=0.5
float x = left[i];
left[i] = signum(x) * powf(fabsf(x), 1.0f / 1.4142f);
left[i] = signum(x) * powf(fabsf(x), 0.625f);
float y = right[i];
right[i] = signum(y) * powf(fabsf(y), 1.0f / 1.4142f);
right[i] = signum(y) * powf(fabsf(y), 0.625f);
}
}