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Chris
@@ -5,43 +5,44 @@ namespace trnr {
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// mulaw companding based on code by Emilie Gillet / Mutable Instruments
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class mulaw {
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public:
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int8_t encode_samples(int16_t pcm_val) {
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int16_t mask;
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int16_t seg;
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uint8_t uval;
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pcm_val = pcm_val >> 2;
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if (pcm_val < 0) {
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pcm_val = -pcm_val;
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mask = 0x7f;
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} else {
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mask = 0xff;
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}
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if (pcm_val > 8159) pcm_val = 8159;
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pcm_val += (0x84 >> 2);
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if (pcm_val <= 0x3f) seg = 0;
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else if (pcm_val <= 0x7f) seg = 1;
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else if (pcm_val <= 0xff) seg = 2;
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else if (pcm_val <= 0x1ff) seg = 3;
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else if (pcm_val <= 0x3ff) seg = 4;
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else if (pcm_val <= 0x7ff) seg = 5;
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else if (pcm_val <= 0xfff) seg = 6;
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else if (pcm_val <= 0x1fff) seg = 7;
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else seg = 8;
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if (seg >= 8)
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return static_cast<uint8_t>(0x7f ^ mask);
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else {
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uval = static_cast<uint8_t>((seg << 4) | ((pcm_val >> (seg + 1)) & 0x0f));
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return (uval ^ mask);
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}
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}
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int8_t encode_samples(int16_t pcm_val)
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{
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int16_t mask;
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int16_t seg;
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uint8_t uval;
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pcm_val = pcm_val >> 2;
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if (pcm_val < 0) {
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pcm_val = -pcm_val;
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mask = 0x7f;
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} else {
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mask = 0xff;
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}
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if (pcm_val > 8159) pcm_val = 8159;
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pcm_val += (0x84 >> 2);
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int16_t decode_samples(uint8_t u_val) {
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int16_t t;
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u_val = ~u_val;
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t = ((u_val & 0xf) << 3) + 0x84;
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t <<= ((unsigned)u_val & 0x70) >> 4;
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return ((u_val & 0x80) ? (0x84 - t) : (t - 0x84));
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}
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if (pcm_val <= 0x3f) seg = 0;
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else if (pcm_val <= 0x7f) seg = 1;
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else if (pcm_val <= 0xff) seg = 2;
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else if (pcm_val <= 0x1ff) seg = 3;
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else if (pcm_val <= 0x3ff) seg = 4;
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else if (pcm_val <= 0x7ff) seg = 5;
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else if (pcm_val <= 0xfff) seg = 6;
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else if (pcm_val <= 0x1fff) seg = 7;
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else seg = 8;
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if (seg >= 8) return static_cast<uint8_t>(0x7f ^ mask);
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else {
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uval = static_cast<uint8_t>((seg << 4) | ((pcm_val >> (seg + 1)) & 0x0f));
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return (uval ^ mask);
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}
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}
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int16_t decode_samples(uint8_t u_val)
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{
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int16_t t;
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u_val = ~u_val;
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t = ((u_val & 0xf) << 3) + 0x84;
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t <<= ((unsigned)u_val & 0x70) >> 4;
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return ((u_val & 0x80) ? (0x84 - t) : (t - 0x84));
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}
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};
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}
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} // namespace trnr
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@@ -1,93 +1,108 @@
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#pragma once
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#include <stdlib.h>
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#include <cstdint>
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#include <cmath>
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#include <cstdint>
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#include <stdlib.h>
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namespace trnr {
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// ulaw compansion based on code by Chris Johnson
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class ulaw {
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public:
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ulaw() {
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fpd_l = 1.0; while (fpd_l < 16386) fpd_l = rand()*UINT32_MAX;
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fpd_r = 1.0; while (fpd_r < 16386) fpd_r = rand()*UINT32_MAX;
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}
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ulaw()
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{
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fpd_l = 1.0;
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while (fpd_l < 16386) fpd_l = rand() * UINT32_MAX;
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fpd_r = 1.0;
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while (fpd_r < 16386) fpd_r = rand() * UINT32_MAX;
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}
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void encode_samples(double& input_sample_l, double& input_sample_r) {
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void encode_samples(double& input_sample_l, double& input_sample_r)
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{
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// ulaw encoding
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static int noisesource_l = 0;
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static int noisesource_r = 850010;
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int residue;
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double applyresidue;
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noisesource_l = noisesource_l % 1700021; noisesource_l++;
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residue = noisesource_l * noisesource_l;
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residue = residue % 170003; residue *= residue;
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residue = residue % 17011; residue *= residue;
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residue = residue % 1709; residue *= residue;
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residue = residue % 173; residue *= residue;
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residue = residue % 17;
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applyresidue = residue;
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applyresidue *= 0.00000001;
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applyresidue *= 0.00000001;
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input_sample_l += applyresidue;
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if (input_sample_l<1.2e-38 && -input_sample_l<1.2e-38) {
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input_sample_l -= applyresidue;
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}
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noisesource_r = noisesource_r % 1700021; noisesource_r++;
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residue = noisesource_r * noisesource_r;
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residue = residue % 170003; residue *= residue;
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residue = residue % 17011; residue *= residue;
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residue = residue % 1709; residue *= residue;
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residue = residue % 173; residue *= residue;
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residue = residue % 17;
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applyresidue = residue;
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applyresidue *= 0.00000001;
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applyresidue *= 0.00000001;
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input_sample_r += applyresidue;
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if (input_sample_r<1.2e-38 && -input_sample_r<1.2e-38) {
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input_sample_r -= applyresidue;
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}
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if (input_sample_l > 1.0) input_sample_l = 1.0;
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if (input_sample_l < -1.0) input_sample_l = -1.0;
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if (input_sample_r > 1.0) input_sample_r = 1.0;
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if (input_sample_r < -1.0) input_sample_r = -1.0;
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if (input_sample_l > 0) input_sample_l = log(1.0+(255*fabs(input_sample_l))) / log(256);
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if (input_sample_l < 0) input_sample_l = -log(1.0+(255*fabs(input_sample_l))) / log(256);
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if (input_sample_r > 0) input_sample_r = log(1.0+(255*fabs(input_sample_r))) / log(256);
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if (input_sample_r < 0) input_sample_r = -log(1.0+(255*fabs(input_sample_r))) / log(256);
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}
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// ulaw encoding
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static int noisesource_l = 0;
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static int noisesource_r = 850010;
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int residue;
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double applyresidue;
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void decode_samples(double& input_sample_l, double& input_sample_r) {
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noisesource_l = noisesource_l % 1700021;
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noisesource_l++;
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residue = noisesource_l * noisesource_l;
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residue = residue % 170003;
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residue *= residue;
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residue = residue % 17011;
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residue *= residue;
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residue = residue % 1709;
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residue *= residue;
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residue = residue % 173;
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residue *= residue;
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residue = residue % 17;
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applyresidue = residue;
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applyresidue *= 0.00000001;
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applyresidue *= 0.00000001;
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input_sample_l += applyresidue;
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if (input_sample_l < 1.2e-38 && -input_sample_l < 1.2e-38) { input_sample_l -= applyresidue; }
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// ulaw decoding
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if (fabs(input_sample_l)<1.18e-23) input_sample_l = fpd_l * 1.18e-17;
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if (fabs(input_sample_r)<1.18e-23) input_sample_r = fpd_r * 1.18e-17;
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if (input_sample_l > 1.0) input_sample_l = 1.0;
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if (input_sample_l < -1.0) input_sample_l = -1.0;
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if (input_sample_r > 1.0) input_sample_r = 1.0;
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if (input_sample_r < -1.0) input_sample_r = -1.0;
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if (input_sample_l > 0) input_sample_l = (pow(256,fabs(input_sample_l))-1.0) / 255;
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if (input_sample_l < 0) input_sample_l = -(pow(256,fabs(input_sample_l))-1.0) / 255;
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if (input_sample_r > 0) input_sample_r = (pow(256,fabs(input_sample_r))-1.0) / 255;
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if (input_sample_r < 0) input_sample_r = -(pow(256,fabs(input_sample_r))-1.0) / 255;
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noisesource_r = noisesource_r % 1700021;
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noisesource_r++;
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residue = noisesource_r * noisesource_r;
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residue = residue % 170003;
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residue *= residue;
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residue = residue % 17011;
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residue *= residue;
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residue = residue % 1709;
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residue *= residue;
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residue = residue % 173;
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residue *= residue;
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residue = residue % 17;
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applyresidue = residue;
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applyresidue *= 0.00000001;
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applyresidue *= 0.00000001;
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input_sample_r += applyresidue;
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if (input_sample_r < 1.2e-38 && -input_sample_r < 1.2e-38) { input_sample_r -= applyresidue; }
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// 64 bit stereo floating point dither
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fpd_l ^= fpd_l << 13; fpd_l ^= fpd_l >> 17; fpd_l ^= fpd_l << 5;
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fpd_r ^= fpd_r << 13; fpd_r ^= fpd_r >> 17; fpd_r ^= fpd_r << 5;
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}
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if (input_sample_l > 1.0) input_sample_l = 1.0;
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if (input_sample_l < -1.0) input_sample_l = -1.0;
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if (input_sample_r > 1.0) input_sample_r = 1.0;
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if (input_sample_r < -1.0) input_sample_r = -1.0;
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if (input_sample_l > 0) input_sample_l = log(1.0 + (255 * fabs(input_sample_l))) / log(256);
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if (input_sample_l < 0) input_sample_l = -log(1.0 + (255 * fabs(input_sample_l))) / log(256);
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if (input_sample_r > 0) input_sample_r = log(1.0 + (255 * fabs(input_sample_r))) / log(256);
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if (input_sample_r < 0) input_sample_r = -log(1.0 + (255 * fabs(input_sample_r))) / log(256);
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}
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void decode_samples(double& input_sample_l, double& input_sample_r)
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{
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// ulaw decoding
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if (fabs(input_sample_l) < 1.18e-23) input_sample_l = fpd_l * 1.18e-17;
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if (fabs(input_sample_r) < 1.18e-23) input_sample_r = fpd_r * 1.18e-17;
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if (input_sample_l > 1.0) input_sample_l = 1.0;
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if (input_sample_l < -1.0) input_sample_l = -1.0;
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if (input_sample_r > 1.0) input_sample_r = 1.0;
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if (input_sample_r < -1.0) input_sample_r = -1.0;
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if (input_sample_l > 0) input_sample_l = (pow(256, fabs(input_sample_l)) - 1.0) / 255;
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if (input_sample_l < 0) input_sample_l = -(pow(256, fabs(input_sample_l)) - 1.0) / 255;
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if (input_sample_r > 0) input_sample_r = (pow(256, fabs(input_sample_r)) - 1.0) / 255;
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if (input_sample_r < 0) input_sample_r = -(pow(256, fabs(input_sample_r)) - 1.0) / 255;
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// 64 bit stereo floating point dither
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fpd_l ^= fpd_l << 13;
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fpd_l ^= fpd_l >> 17;
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fpd_l ^= fpd_l << 5;
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fpd_r ^= fpd_r << 13;
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fpd_r ^= fpd_r >> 17;
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fpd_r ^= fpd_r << 5;
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}
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private:
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uint32_t fpd_l;
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uint32_t fpd_l;
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uint32_t fpd_r;
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};
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}
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} // namespace trnr
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