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combine prestep and step1/2

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UnknownShadow200 2018-08-10 00:30:03 +10:00
parent 57d52b5da7
commit 6b39f11cc0
1 changed files with 13 additions and 22 deletions
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35
src/Client/Vorbis.c
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@ -850,21 +850,16 @@ void imdct_calc(Real32* in, Real32* out, struct imdct_state* state) {
Real32 u[VORBIS_MAX_BLOCK_SIZE];
Real32 v[VORBIS_MAX_BLOCK_SIZE];
Real32 w[VORBIS_MAX_BLOCK_SIZE];
/* spectral coefficients */
for (k = 0; k < n2; k++) u[k] = in[k];
for ( ; k < n; k++) u[k] = -in[n-k-1];
/* step 1 and step 2 */
/* spectral coefficients, step 1, step 2 */
for (k = 0, k2 = 0, k4 = 0; k < n8; k++, k2 += 2, k4 += 4) {
Real32 e_1 = u[n-4-k4], e_2 = u[n-2-k4];
Real32 f_1 = u[k4+3], f_2 = u[k4+1];
Real32 g_1 = (e_1 - f_1) * A[n2-1-k2] + (e_2 - f_2) * A[n2-2-k2];
Real32 g_2 = (e_1 - f_1) * A[n2-2-k2] - (e_2 - f_2) * A[n2-1-k2];
Real32 e_1 = -in[k4+3], e_2 = -in[k4+1];
Real32 g_1 = 2*e_1 * A[n2-1-k2] + 2*e_2 * A[n2-2-k2];
Real32 g_2 = 2*e_1 * A[n2-2-k2] - 2*e_2 * A[n2-1-k2];
Real32 x_1 = u[n2-k4-4], x_2 = u[n2-k4-2];
Real32 y_1 = u[n2+k4+3], y_2 = u[n2+k4+1];
Real32 h_2 = (x_1 - y_1) * A[n4-2-k2] - (x_2 - y_2) * A[n4-1-k2];
Real32 h_1 = (x_1 - y_1) * A[n4-1-k2] + (x_2 - y_2) * A[n4-2-k2];
Real32 f_1 = in[n2-4-k4], f_2 = in[n2-2-k4];
Real32 h_2 = 2*f_1 * A[n4-2-k2] - 2*f_2 * A[n4-1-k2];
Real32 h_1 = 2*f_1 * A[n4-1-k2] + 2*f_2 * A[n4-2-k2];
w[n2+3+k4] = h_2 + g_2;
w[n2+1+k4] = h_1 + g_1;
@ -916,16 +911,12 @@ void imdct_calc(Real32* in, Real32* out, struct imdct_state* state) {
out[n3_4-1-k] = 0.5f * -x_1;
out[n3_4+k] = 0.5f * -x_1;
Int32 tmp = k, tmp2 = k2;
k = n4-1-k; k2 = n2-2-k2;
Real32 y_1 = h_1 * B[k2] + h_2 * B[k2+1];
Real32 y_2 = h_1 * B[k2+1] - h_2 * B[k2];
out[n4-1-k] = 0.5f * y_2;
out[n4+k] = 0.5f * -y_2;
out[n3_4-1-k] = 0.5f * -y_1;
out[n3_4+k] = 0.5f * -y_1;
k = tmp; k2 = tmp2;
Real32 y_1 = h_1 * B[n2-2-k2] + h_2 * B[n2-1-k2];
Real32 y_2 = h_1 * B[n2-1-k2] - h_2 * B[n2-2-k2];
out[k] = 0.5f * y_2;
out[n2-1-k] = 0.5f * -y_2;
out[n2+k] = 0.5f * -y_1;
out[n-1-k] = 0.5f * -y_1;
}
}