diff --git a/apu/hermite_resampler.h b/apu/hermite_resampler.h index 394ecee5..e3fdbb36 100644 --- a/apu/hermite_resampler.h +++ b/apu/hermite_resampler.h @@ -19,27 +19,25 @@ class HermiteResampler : public Resampler int r_left[4], r_right[4]; static inline int32 - hermite (uint32 mu1, int32 a, int32 b, int32 c, int32 d) + hermite (int32 mu1, int32 a, int32 b, int32 c, int32 d) { - uint32 mu2, mu3, m0, m1, a0, a1, a2, a3; + int32 mu2, mu3, m0, m1, a0, a1, a2, a3; mu2 = (mu1 * mu1) >> 15; mu3 = (mu2 * mu1) >> 15; - m0 = (c - a + 32768) << 14; - m1 = (d - b + 32768) << 14; + m0 = (c - a) << 14; + m1 = (d - b) << 14; a0 = (mu3 << 1) - (3 * mu2) + (1 << 15); a1 = mu3 - (mu2 << 1) + mu1; a2 = mu3 - mu2; a3 = 3 * mu2 - (mu3 << 1); - return (int32) (( - (a0 * (b + 32768)) + - ((a1 * m0) >> 15) + - ((a2 * m1) >> 15) + - (a3 * (c + 32768)) - ) >> 15) - 32768; + return (a0 * b) + + ((a1 * m0) >> 15) + + ((a2 * m1) >> 15) + + (a3 * c) >> 15; } public: @@ -55,7 +53,7 @@ class HermiteResampler : public Resampler void time_ratio (double ratio) { - r_step = (1 << 15) * ratio; + r_step = (1 << 16) * ratio; clear (); } @@ -63,7 +61,7 @@ class HermiteResampler : public Resampler clear (void) { ring_buffer::clear (); - r_frac = (1 << 15); + r_frac = (1 << 16); r_left [0] = r_left [1] = r_left [2] = r_left [3] = 0; r_right[0] = r_right[1] = r_right[2] = r_right[3] = 0; } @@ -83,11 +81,11 @@ class HermiteResampler : public Resampler int s_right = internal_buffer[i_position + 1]; int hermite_val; - while (r_frac <= (1 << 15) && o_position < num_samples) + while (r_frac <= (1 << 16) && o_position < num_samples) { - hermite_val = hermite (r_frac, r_left [0], r_left [1], r_left [2], r_left [3]); + hermite_val = hermite (r_frac >> 1, r_left [0], r_left [1], r_left [2], r_left [3]); data[o_position] = SHORT_CLAMP (hermite_val); - hermite_val = hermite (r_frac, r_right[0], r_right[1], r_right[2], r_right[3]); + hermite_val = hermite (r_frac >> 1, r_right[0], r_right[1], r_right[2], r_right[3]); data[o_position + 1] = SHORT_CLAMP (hermite_val); o_position += 2; @@ -95,7 +93,7 @@ class HermiteResampler : public Resampler r_frac += r_step; } - if (r_frac > (1 << 15)) + if (r_frac > (1 << 16)) { r_left [0] = r_left [1]; r_left [1] = r_left [2]; @@ -107,7 +105,7 @@ class HermiteResampler : public Resampler r_right[2] = r_right[3]; r_right[3] = s_right; - r_frac -= (1 << 15); + r_frac -= (1 << 16); i_position += 2; if (i_position >= max_samples) @@ -125,7 +123,7 @@ class HermiteResampler : public Resampler inline int avail (void) { - return ((((uint32) size) << 13) - r_frac) / r_step * 2; + return ((((uint32) size) << 14) - r_frac) / r_step * 2; } };