mirror of https://github.com/snes9xgit/snes9x.git
Add a consolidated resampler.
This commit is contained in:
Brandon Wright
parent
5b4ca50792
commit
36406a6627
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@ -11,7 +11,7 @@
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#include "../msu1.h"
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#include "../snapshot.h"
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#include "../display.h"
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#include "hermite_resampler.h"
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#include "resampler.h"
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#include "bapu/snes/snes.hpp"
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@ -243,14 +243,14 @@ bool8 S9xInitSound(int buffer_ms, int unused2)
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if (!spc::resampler)
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{
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spc::resampler = new HermiteResampler(buffer_size_samples);
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spc::resampler = new Resampler(buffer_size_samples);
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if (!spc::resampler)
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return (FALSE);
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}
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if (!msu::resampler)
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{
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msu::resampler = new HermiteResampler(buffer_size_samples * 3 / 2);
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msu::resampler = new Resampler(buffer_size_samples * 3 / 2);
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if (!msu::resampler)
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return (FALSE);
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}
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@ -1,145 +0,0 @@
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/*****************************************************************************\
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Snes9x - Portable Super Nintendo Entertainment System (TM) emulator.
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This file is licensed under the Snes9x License.
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For further information, consult the LICENSE file in the root directory.
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\*****************************************************************************/
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#ifndef __HERMITE_RESAMPLER_H
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#define __HERMITE_RESAMPLER_H
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#include "resampler.h"
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#include <assert.h>
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#undef CLAMP
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#undef SHORT_CLAMP
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#define CLAMP(x, low, high) (((x) > (high)) ? (high) : (((x) < (low)) ? (low) : (x)))
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#define SHORT_CLAMP(n) ((short) CLAMP((n), -32768, 32767))
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class HermiteResampler : public Resampler
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{
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protected:
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float r_step;
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float r_frac;
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int r_left[4], r_right[4];
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static inline float
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hermite (float mu1, float a, float b, float c, float d)
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{
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float mu2, mu3, m0, m1, a0, a1, a2, a3;
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mu2 = mu1 * mu1;
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mu3 = mu2 * mu1;
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m0 = (c - a) * 0.5;
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m1 = (d - b) * 0.5;
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a0 = +2 * mu3 - 3 * mu2 + 1;
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a1 = mu3 - 2 * mu2 + mu1;
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a2 = mu3 - mu2;
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a3 = -2 * mu3 + 3 * mu2;
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return (a0 * b) + (a1 * m0) + (a2 * m1) + (a3 * c);
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}
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public:
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HermiteResampler (int num_samples) : Resampler (num_samples)
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{
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clear ();
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}
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~HermiteResampler ()
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{
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}
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void
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time_ratio (double ratio)
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{
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r_step = ratio;
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}
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void
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clear (void)
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{
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ring_buffer::clear ();
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r_frac = 0.0;
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r_left [0] = r_left [1] = r_left [2] = r_left [3] = 0;
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r_right[0] = r_right[1] = r_right[2] = r_right[3] = 0;
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}
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void
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read (short *data, int num_samples)
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{
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//If we are outputting the exact same ratio as the input, pull directly from the input buffer
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if (r_step == 1.0)
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{
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ring_buffer::pull((unsigned char*)data, num_samples * sizeof(short));
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return;
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}
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assert((num_samples & 1) == 0); // resampler always processes both stereo samples
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int i_position = start >> 1;
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int max_samples = buffer_size >> 1;
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short *internal_buffer = (short *) buffer;
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int o_position = 0;
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int consumed = 0;
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while (o_position < num_samples && consumed < buffer_size)
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{
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int s_left = internal_buffer[i_position];
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int s_right = internal_buffer[i_position + 1];
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float hermite_val[2];
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while (r_frac <= 1.0 && o_position < num_samples)
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{
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hermite_val[0] = hermite (r_frac, r_left [0], r_left [1], r_left [2], r_left [3]);
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hermite_val[1] = hermite (r_frac, r_right[0], r_right[1], r_right[2], r_right[3]);
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data[o_position] = SHORT_CLAMP (hermite_val[0]);
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data[o_position + 1] = SHORT_CLAMP (hermite_val[1]);
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o_position += 2;
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r_frac += r_step;
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}
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if (r_frac > 1.0)
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{
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r_left [0] = r_left [1];
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r_left [1] = r_left [2];
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r_left [2] = r_left [3];
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r_left [3] = s_left;
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r_right[0] = r_right[1];
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r_right[1] = r_right[2];
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r_right[2] = r_right[3];
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r_right[3] = s_right;
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r_frac -= 1.0;
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i_position += 2;
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if (i_position >= max_samples)
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i_position -= max_samples;
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consumed += 2;
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}
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}
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size -= consumed << 1;
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start += consumed << 1;
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if (start >= buffer_size)
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start -= buffer_size;
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}
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inline int
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avail (void)
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{
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//If we are outputting the exact same ratio as the input, find out directly from the input buffer
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if (r_step == 1.0)
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{
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return (ring_buffer::space_filled() + sizeof(short) - 1) / sizeof(short);
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}
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return (int) trunc (((size >> 2) - r_frac) / r_step) * 2;
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}
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};
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#endif /* __HERMITE_RESAMPLER_H */
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184
apu/resampler.h
184
apu/resampler.h
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@ -4,61 +4,193 @@
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For further information, consult the LICENSE file in the root directory.
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\*****************************************************************************/
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#ifndef __RESAMPLER_H
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#define __RESAMPLER_H
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#ifndef __NEW_RESAMPLER_H
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#define __NEW_RESAMPLER_H
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#include "ring_buffer.h"
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#include <cstring>
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#include <cassert>
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#include <cstdint>
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#include <cmath>
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class Resampler : public ring_buffer
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struct Resampler
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{
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public:
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virtual void clear (void) = 0;
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virtual void time_ratio (double) = 0;
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virtual void read (short *, int) = 0;
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virtual int avail (void) = 0;
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int size;
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int buffer_size;
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int start;
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int16_t *buffer;
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Resampler (int num_samples) : ring_buffer (num_samples << 1)
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float r_step;
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float r_frac;
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int r_left[4], r_right[4];
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static inline int16_t short_clamp(int16_t n)
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{
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return (int16_t)(((int16_t)n != n) ? (n >> 31) ^ 0x7fff : n);
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}
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virtual ~Resampler ()
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static inline int min(int a, int b)
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{
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return ((a) < (b) ? (a) : (b));
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}
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inline bool
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push (short *src, int num_samples)
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static inline float hermite(float mu1, float a, float b, float c, float d)
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{
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if (max_write () < num_samples)
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float mu2, mu3, m0, m1, a0, a1, a2, a3;
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mu2 = mu1 * mu1;
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mu3 = mu2 * mu1;
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m0 = (c - a) * 0.5;
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m1 = (d - b) * 0.5;
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a0 = +2 * mu3 - 3 * mu2 + 1;
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a1 = mu3 - 2 * mu2 + mu1;
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a2 = mu3 - mu2;
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a3 = -2 * mu3 + 3 * mu2;
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return (a0 * b) + (a1 * m0) + (a2 * m1) + (a3 * c);
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}
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Resampler(int num_samples)
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{
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this->buffer_size = num_samples;
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buffer = new int16_t[this->buffer_size];
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clear();
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}
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~Resampler()
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{
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delete[] buffer;
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}
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inline void time_ratio(double ratio)
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{
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r_step = ratio;
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}
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inline void clear(void)
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{
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start = 0;
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size = 0;
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memset(buffer, 0, buffer_size * 2);
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r_frac = 0.0;
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r_left[0] = r_left[1] = r_left[2] = r_left[3] = 0;
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r_right[0] = r_right[1] = r_right[2] = r_right[3] = 0;
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}
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inline bool pull(int16_t *dst, int num_samples)
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{
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if (space_filled() < num_samples)
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return false;
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!num_samples || ring_buffer::push ((unsigned char *) src, num_samples << 1);
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memcpy(dst, buffer + start, min(num_samples, buffer_size - start) * 2);
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if (num_samples > (buffer_size - start))
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memcpy(dst + (buffer_size - start), buffer, (num_samples - (buffer_size - start)) * 2);
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start = (start + num_samples) % buffer_size;
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size -= num_samples;
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return true;
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}
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inline int
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space_empty (void) const
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inline bool push(int16_t *src, int num_samples)
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{
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if (space_empty() < num_samples)
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return false;
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int end = (start + size) % buffer_size;
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int first_write_size = min(num_samples, buffer_size - end);
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memcpy(buffer + end, src, first_write_size * 2);
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if (num_samples > first_write_size)
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memcpy(buffer, src + first_write_size, (num_samples - first_write_size) * 2);
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size += num_samples;
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return true;
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}
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void read(int16_t *data, int num_samples)
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{
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//If we are outputting the exact same ratio as the input, pull directly from the input buffer
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if (r_step == 1.0)
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{
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pull(data, num_samples);
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return;
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}
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assert((num_samples & 1) == 0); // resampler always processes both stereo samples
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int o_position = 0;
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while (o_position < num_samples && size > 0)
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{
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int s_left = buffer[start];
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int s_right = buffer[start + 1];
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int hermite_val[2];
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while (r_frac <= 1.0 && o_position < num_samples)
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{
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hermite_val[0] = hermite(r_frac, r_left[0], r_left[1], r_left[2], r_left[3]);
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hermite_val[1] = hermite(r_frac, r_right[0], r_right[1], r_right[2], r_right[3]);
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data[o_position] = short_clamp(hermite_val[0]);
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data[o_position + 1] = short_clamp(hermite_val[1]);
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o_position += 2;
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r_frac += r_step;
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}
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if (r_frac > 1.0)
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{
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r_left[0] = r_left[1];
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r_left[1] = r_left[2];
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r_left[2] = r_left[3];
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r_left[3] = s_left;
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r_right[0] = r_right[1];
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r_right[1] = r_right[2];
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r_right[2] = r_right[3];
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r_right[3] = s_right;
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r_frac -= 1.0;
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start += 2;
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if (start >= buffer_size)
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start -= buffer_size;
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size -= 2;
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}
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}
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}
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inline int space_empty(void) const
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{
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return buffer_size - size;
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}
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inline int
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space_filled (void) const
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inline int space_filled(void) const
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{
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return size;
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}
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inline int
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max_write (void) const
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inline int avail(void)
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{
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return space_empty () >> 1;
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//If we are outputting the exact same ratio as the input, find out directly from the input buffer
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if (r_step == 1.0)
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return size;
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return (int)trunc(((size >> 1) - r_frac) / r_step) * 2;
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}
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inline void
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resize (int num_samples)
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inline void resize(int num_samples)
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{
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ring_buffer::resize (num_samples << 1);
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delete[] buffer;
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buffer_size = num_samples;
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buffer = new int16_t[buffer_size];
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clear();
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}
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};
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#endif /* __RESAMPLER_H */
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#endif /* __NEW_RESAMPLER_H */
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@ -1,115 +0,0 @@
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/*****************************************************************************\
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Snes9x - Portable Super Nintendo Entertainment System (TM) emulator.
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This file is licensed under the Snes9x License.
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For further information, consult the LICENSE file in the root directory.
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\*****************************************************************************/
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#ifndef __RING_BUFFER_H
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#define __RING_BUFFER_H
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#include <string.h>
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#undef MIN
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#define MIN(a, b) ((a) < (b) ? (a) : (b))
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class ring_buffer
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{
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protected:
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int size;
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int buffer_size;
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int start;
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unsigned char *buffer;
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public:
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ring_buffer (int buffer_size)
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{
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this->buffer_size = buffer_size;
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buffer = new unsigned char[this->buffer_size];
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memset (buffer, 0, this->buffer_size);
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size = 0;
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start = 0;
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}
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~ring_buffer (void)
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{
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delete[] buffer;
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}
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bool
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push (unsigned char *src, int bytes)
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{
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if (space_empty () < bytes)
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return false;
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int end = (start + size) % buffer_size;
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int first_write_size = MIN (bytes, buffer_size - end);
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memcpy (buffer + end, src, first_write_size);
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if (bytes > first_write_size)
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memcpy (buffer, src + first_write_size, bytes - first_write_size);
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size += bytes;
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return true;
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}
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bool
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pull (unsigned char *dst, int bytes)
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{
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if (space_filled () < bytes)
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return false;
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memcpy (dst, buffer + start, MIN (bytes, buffer_size - start));
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if (bytes > (buffer_size - start))
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memcpy (dst + (buffer_size - start), buffer, bytes - (buffer_size - start));
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start = (start + bytes) % buffer_size;
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size -= bytes;
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return true;
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}
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inline int
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space_empty (void) const
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{
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return buffer_size - size;
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}
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inline int
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space_filled (void) const
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{
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return size;
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}
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void
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clear (void)
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{
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start = 0;
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size = 0;
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memset (buffer, 0, buffer_size);
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}
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void
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resize (int size)
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{
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delete[] buffer;
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buffer_size = size;
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buffer = new unsigned char[buffer_size];
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memset (buffer, 0, this->buffer_size);
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this->size = 0;
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start = 0;
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}
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inline void
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cache_silence (void)
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{
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clear ();
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size = buffer_size;
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}
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};
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#endif
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