/[svn]/linuxsampler/trunk/src/engines/common/Resampler.h
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Sat Jul 22 14:22:53 2006 UTC (17 years, 8 months ago) by persson
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* real support for 24 bit samples - samples are not truncated to 16
  bits anymore
* support for aftertouch (channel pressure, not polyphonic aftertouch)

1 schoenebeck 320 /***************************************************************************
2     * *
3     * LinuxSampler - modular, streaming capable sampler *
4     * *
5     * Copyright (C) 2003, 2004 by Benno Senoner and Christian Schoenebeck *
6 schoenebeck 617 * Copyright (C) 2005 Christian Schoenebeck *
7 schoenebeck 320 * *
8     * This program is free software; you can redistribute it and/or modify *
9     * it under the terms of the GNU General Public License as published by *
10     * the Free Software Foundation; either version 2 of the License, or *
11     * (at your option) any later version. *
12     * *
13     * This program is distributed in the hope that it will be useful, *
14     * but WITHOUT ANY WARRANTY; without even the implied warranty of *
15     * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
16     * GNU General Public License for more details. *
17     * *
18     * You should have received a copy of the GNU General Public License *
19     * along with this program; if not, write to the Free Software *
20     * Foundation, Inc., 59 Temple Place, Suite 330, Boston, *
21     * MA 02111-1307 USA *
22     ***************************************************************************/
23    
24     #ifndef __LS_RESAMPLER_H__
25     #define __LS_RESAMPLER_H__
26    
27     #include "../../common/global.h"
28    
29     // TODO: cubic interpolation is not yet supported by the MMX/SSE(1) version though
30 persson 903 // TODO: cubic interpolation is not supported for 24 bit samples
31 schoenebeck 320 #ifndef USE_LINEAR_INTERPOLATION
32     # define USE_LINEAR_INTERPOLATION 1 ///< set to 0 if you prefer cubic interpolation (slower, better quality)
33     #endif
34    
35     namespace LinuxSampler {
36    
37 schoenebeck 563 /** @brief Stereo sample point
38     *
39     * Encapsulates one stereo sample point, thus signal value for one
40     * sample point for left and right channel.
41     */
42 schoenebeck 320 struct stereo_sample_t {
43     float left;
44     float right;
45     };
46    
47 schoenebeck 563 /** @brief Resampler Template
48     *
49     * This template provides pure C++ and MMX/SSE assembly implementations
50     * for linear and cubic interpolation for pitching a mono or stereo
51     * input signal.
52     */
53 persson 903 template<bool INTERPOLATE,bool BITDEPTH24>
54 schoenebeck 320 class Resampler {
55     public:
56     inline static float GetNextSampleMonoCPP(sample_t* pSrc, double* Pos, float& Pitch) {
57     if (INTERPOLATE) return Interpolate1StepMonoCPP(pSrc, Pos, Pitch);
58     else { // no pitch, so no interpolation necessary
59     int pos_int = (int) *Pos;
60     *Pos += 1.0;
61     return pSrc [pos_int];
62     }
63     }
64    
65     inline static stereo_sample_t GetNextSampleStereoCPP(sample_t* pSrc, double* Pos, float& Pitch) {
66     if (INTERPOLATE) return Interpolate1StepStereoCPP(pSrc, Pos, Pitch);
67     else { // no pitch, so no interpolation necessary
68     int pos_int = (int) *Pos;
69     pos_int <<= 1;
70     *Pos += 1.0;
71     stereo_sample_t samplePoint;
72     samplePoint.left = pSrc[pos_int];
73     samplePoint.right = pSrc[pos_int+1];
74     return samplePoint;
75     }
76     }
77    
78 schoenebeck 617 #if CONFIG_ASM && ARCH_X86
79 schoenebeck 320 inline static void GetNext4SamplesMonoMMXSSE(sample_t* pSrc, void* Pos, float& Pitch) {
80     if (INTERPOLATE) Interpolate4StepsMonoMMXSSE(pSrc, Pos, Pitch);
81     else { // no pitch, so no interpolation necessary
82     const float __4f = 4.0f;
83     __asm__ __volatile__ (
84     "movss (%1), %%xmm5 # load Pos\n\t"
85     "cvtss2si %%xmm5, %%edi # int(Pos)\n\t"
86     "addss %2, %%xmm5 # Pos += 4.0f\n\t"
87     "movswl (%0,%%edi,2), %%eax # load sample 0\n\t"
88     "cvtsi2ss %%eax, %%xmm2 # convert to float\n\t"
89     "shufps $0x93, %%xmm2, %%xmm2 # shift up\n\t"
90     "movswl 2(%0,%%edi,2), %%edx # load sample 1\n\t"
91     "cvtsi2ss %%edx, %%xmm2 # convert to float\n\t"
92     "shufps $0x93, %%xmm2, %%xmm2 # shift up\n\t"
93     "movss %%xmm5, (%1) # update Pos\n\t"
94     "movswl 4(%0,%%edi,2), %%eax # load sample 2\n\t"
95     "cvtsi2ss %%eax, %%xmm2 # convert to float\n\t"
96     "shufps $0x93, %%xmm2, %%xmm2 # shift up\n\t"
97     "movswl 6(%0,%%edi,2), %%edx # load sample 3\n\t"
98     "cvtsi2ss %%edx, %%xmm2 # convert to float\n\t"
99     "shufps $0x1b, %%xmm2, %%xmm2 # swap to correct order\n\t"
100     :: "r" (pSrc), "r" (Pos), "m" (__4f)
101     : "%eax", "%edx", "%edi"
102     );
103     }
104     }
105    
106     inline static void GetNext4SamplesStereoMMXSSE(sample_t* pSrc, void* Pos, float& Pitch) {
107     if (INTERPOLATE) {
108     Interpolate4StepsStereoMMXSSE(pSrc, Pos, Pitch);
109     //EMMS;
110     } else { // no pitch, so no interpolation necessary
111     const float __4f = 4.0f;
112     __asm__ __volatile__ (
113     "movss (%1), %%xmm5 # load Pos\n\t"
114     "cvtss2si %%xmm5, %%edi # int(Pos)\n\t"
115     "addss %2, %%xmm5 # Pos += 4.0f\n\t"
116     "movswl (%0, %%edi,4), %%eax # load sample 0 (left)\n\t"
117     "cvtsi2ss %%eax, %%xmm2 # convert to float\n\t"
118     "shufps $0x93, %%xmm2, %%xmm2 # shift up\n\t"
119     "movss %%xmm5, (%1) # update Pos\n\t"
120     "movswl 2(%0, %%edi,4), %%edx # load sample 0 (left)\n\t"
121     "cvtsi2ss %%edx, %%xmm3 # convert to float\n\t"
122     "shufps $0x93, %%xmm3, %%xmm3 # shift up\n\t"
123     "movswl 4(%0, %%edi,4), %%eax # load sample 1 (left)\n\t"
124     "cvtsi2ss %%eax, %%xmm2 # convert to float\n\t"
125     "shufps $0x93, %%xmm2, %%xmm2 # shift up\n\t"
126     "movswl 6(%0, %%edi,4), %%edx # load sample 1 (right)\n\t"
127     "cvtsi2ss %%edx, %%xmm3 # convert to float\n\t"
128     "shufps $0x93, %%xmm3, %%xmm3 # shift up\n\t"
129     "movswl 8(%0, %%edi,4), %%eax # load sample 2 (left)\n\t"
130     "cvtsi2ss %%eax, %%xmm2 # convert to float\n\t"
131     "shufps $0x93, %%xmm2, %%xmm2 # shift up\n\t"
132     "movswl 10(%0, %%edi,4), %%edx # load sample 2 (right)\n\t"
133     "cvtsi2ss %%edx, %%xmm3 # convert to float\n\t"
134     "shufps $0x93, %%xmm3, %%xmm3 # shift up\n\t"
135     "movswl 12(%0, %%edi,4), %%eax # load sample 3 (left)\n\t"
136     "cvtsi2ss %%eax, %%xmm2 # convert to float\n\t"
137     "shufps $0x1b, %%xmm2, %%xmm2 # swap to correct order\n\t"
138     "movswl 14(%0, %%edi,4), %%edx # load sample 3 (right)\n\t"
139     "cvtsi2ss %%edx, %%xmm3 # convert to float\n\t"
140     "shufps $0x1b, %%xmm3, %%xmm3 # swap to correct order\n\t"
141     :: "r" (pSrc), "r" (Pos), "m" (__4f)
142     : "%eax", "%edx", "%edi"
143     );
144     }
145     }
146 schoenebeck 617 #endif // CONFIG_ASM && ARCH_X86
147 schoenebeck 320
148     protected:
149    
150 persson 903 static int getSample(sample_t* src, int pos) {
151     if (BITDEPTH24) {
152     pos *= 3;
153     unsigned char* p = (unsigned char*)src;
154     return p[pos] << 8 | p[pos + 1] << 16 | p[pos + 2] << 24;
155     } else {
156     return src[pos];
157     }
158     }
159    
160 schoenebeck 320 inline static float Interpolate1StepMonoCPP(sample_t* pSrc, double* Pos, float& Pitch) {
161     int pos_int = (int) *Pos; // integer position
162     float pos_fract = *Pos - pos_int; // fractional part of position
163    
164     #if USE_LINEAR_INTERPOLATION
165 persson 903 int x1 = getSample(pSrc, pos_int);
166     int x2 = getSample(pSrc, pos_int + 1);
167     float samplePoint = (x1 + pos_fract * (x2 - x1));
168 schoenebeck 320 #else // polynomial interpolation
169     float xm1 = pSrc[pos_int];
170     float x0 = pSrc[pos_int+1];
171     float x1 = pSrc[pos_int+2];
172     float x2 = pSrc[pos_int+3];
173     float a = (3.0f * (x0 - x1) - xm1 + x2) * 0.5f;
174     float b = 2.0f * x1 + xm1 - (5.0f * x0 + x2) * 0.5f;
175     float c = (x1 - xm1) * 0.5f;
176     float samplePoint = (((a * pos_fract) + b) * pos_fract + c) * pos_fract + x0;
177     #endif // USE_LINEAR_INTERPOLATION
178    
179     *Pos += Pitch;
180     return samplePoint;
181     }
182    
183     inline static stereo_sample_t Interpolate1StepStereoCPP(sample_t* pSrc, double* Pos, float& Pitch) {
184     int pos_int = (int) *Pos; // integer position
185     float pos_fract = *Pos - pos_int; // fractional part of position
186     pos_int <<= 1;
187    
188     stereo_sample_t samplePoint;
189    
190     #if USE_LINEAR_INTERPOLATION
191     // left channel
192 persson 903 int x1 = getSample(pSrc, pos_int);
193     int x2 = getSample(pSrc, pos_int + 2);
194     samplePoint.left = (x1 + pos_fract * (x2 - x1));
195 schoenebeck 320 // right channel
196 persson 903 x1 = getSample(pSrc, pos_int + 1);
197     x2 = getSample(pSrc, pos_int + 3);
198     samplePoint.right = (x1 + pos_fract * (x2 - x1));
199 schoenebeck 320 #else // polynomial interpolation
200     // calculate left channel
201     float xm1 = pSrc[pos_int];
202     float x0 = pSrc[pos_int+2];
203     float x1 = pSrc[pos_int+4];
204     float x2 = pSrc[pos_int+6];
205     float a = (3.0f * (x0 - x1) - xm1 + x2) * 0.5f;
206     float b = 2.0f * x1 + xm1 - (5.0f * x0 + x2) * 0.5f;
207     float c = (x1 - xm1) * 0.5f;
208     samplePoint.left = (((a * pos_fract) + b) * pos_fract + c) * pos_fract + x0;
209    
210     //calculate right channel
211     xm1 = pSrc[pos_int+1];
212     x0 = pSrc[pos_int+3];
213     x1 = pSrc[pos_int+5];
214     x2 = pSrc[pos_int+7];
215     a = (3.0f * (x0 - x1) - xm1 + x2) * 0.5f;
216     b = 2.0f * x1 + xm1 - (5.0f * x0 + x2) * 0.5f;
217     c = (x1 - xm1) * 0.5f;
218     samplePoint.right = (((a * pos_fract) + b) * pos_fract + c) * pos_fract + x0;
219     #endif // USE_LINEAR_INTERPOLATION
220    
221     *Pos += Pitch;
222     return samplePoint;
223     }
224    
225 schoenebeck 617 #if CONFIG_ASM && ARCH_X86
226 schoenebeck 320 // TODO: no support for cubic interpolation yet
227     inline static void Interpolate4StepsMonoMMXSSE(sample_t* pSrc, void* Pos, float& Pitch) {
228     /* calculate playback position of each of the 4 samples by adding the associated pitch */
229     __asm__ __volatile__ (
230     "movss (%0),%%xmm0 # sample position of sample[0] -> xmm0[0]\n\t"
231     "movss %1,%%xmm1 # copy pitch -> xmm1[0]\n\t"
232     "shufps $0x90,%%xmm0,%%xmm0 # shift up, but keep xmm0[0]\n\t"
233     "addss %%xmm1,%%xmm0 # calculate sample position of sample[1]\n\t"
234     "shufps $0x90,%%xmm0,%%xmm0 # shift up, but keep xmm0[0]\n\t"
235     "addss %%xmm1,%%xmm0 # calculate sample position of sample[2]\n\t"
236     "shufps $0x90,%%xmm0,%%xmm0 # shift up, but keep xmm0[0]\n\t"
237     "addss %%xmm1,%%xmm0 # calculate sample position of sample[3]\n\t"
238     "movss %%xmm0,%%xmm2 # xmm0[0] -> xmm2[0]\n\t"
239     "addss %%xmm1,%%xmm2 # calculate initial sample position for the next 4-sample cycle\n\t"
240     "movss %%xmm2,(%0) # update 'Pos'\n\t"
241     "shufps $0x1b,%%xmm0,%%xmm0 # swap, so that xmm0[0]=sample pos 0, xmm0[1]=sample pos 1,...\n\t"
242     "cvttps2pi %%xmm0,%%mm4 # int(xmm0[0-1]) -> mm4\n\t"
243     "shufps $0xe4,%%xmm0,%%xmm1 # xmm0[2-3] -> xmm1[2-3]\n\t"
244     "shufps $0x0e,%%xmm1,%%xmm1 # xmm1[2-3] -> xmm1[0-1]\n\t"
245     "cvttps2pi %%xmm1,%%mm5 # int(xmm1[0-1]) -> mm5\n\t"
246     "cvtpi2ps %%mm5,%%xmm1 # double(mm5) -> xmm1[0-1]\n\t"
247     "shufps $0x44,%%xmm1,%%xmm1 # shift lower 2 FPs up to the upper 2 cells\n\t"
248     "cvtpi2ps %%mm4,%%xmm1 # double(mm4) -> xmm1[0-1]\n\t"
249     "subps %%xmm1,%%xmm0 # xmm0[1-3] = xmm0[1-3] - xmm1[1-3]\n\t"
250     :
251     : "r" (Pos), /* %0 */
252     "m" (Pitch) /* %1 */
253     : "%xmm0", /* holds fractional position (0.0 <= x < 1.0) of sample 0-3 at the end */
254     "%xmm1", /* holds integer position (back converted to SPFP) of sample 0-3 at the end */
255     "mm4", /* holds integer position of sample 0-1 at the end */
256     "mm5", /* holds integer position of sample 2-3 at the end */
257     "st", "st(1)", "st(2)", "st(3)", "st(4)", "st(5)", "st(6)", "st(7)"
258     );
259     /* get sample values of pSrc[pos_int] and pSrc[pos_int+1] of the 4 samples */
260     __asm__ __volatile__ (
261     "movd %%mm4,%%edi # sample position of sample 0\n\t"
262     "psrlq $32,%%mm4 # mm4 >> 32\n\t"
263     "movswl (%0,%%edi,2),%%eax # pSrc[pos_int] (sample 0)\n\t"
264     "movswl 2(%0,%%edi,2),%%ecx # pSrc[pos_int] (sample 0+1)\n\t"
265     "cvtsi2ss %%eax, %%xmm2 # pSrc[pos_int] -> xmm2[0]\n\t"
266     "cvtsi2ss %%ecx, %%xmm3 # pSrc[pos_int] -> xmm3[0]\n\t"
267     "shufps $0x93, %%xmm2, %%xmm2 # shift up\n\t"
268     "shufps $0x93, %%xmm3, %%xmm3 # shift up\n\t"
269     "movd %%mm4,%%edi # sample position of sample 1\n\t"
270     "movswl (%0,%%edi,2),%%eax # pSrc[pos_int] (sample 1)\n\t"
271     "movswl 2(%0,%%edi,2),%%ecx # pSrc[pos_int] (sample 1+1)\n\t"
272     "cvtsi2ss %%eax, %%xmm2 # pSrc[pos_int] -> xmm2[0]\n\t"
273     "cvtsi2ss %%ecx, %%xmm3 # pSrc[pos_int] -> xmm3[0]\n\t"
274     "shufps $0x93, %%xmm2, %%xmm2 # shift up\n\t"
275     "shufps $0x93, %%xmm3, %%xmm3 # shift up\n\t"
276     "movd %%mm5,%%edi # sample position of sample 2\n\t"
277     "psrlq $32,%%mm5 # mm5 >> 32\n\t"
278     "movswl (%0,%%edi,2),%%eax # pSrc[pos_int] (sample 2)\n\t"
279     "movswl 2(%0,%%edi,2),%%ecx # pSrc[pos_int] (sample 2+1)\n\t"
280     "cvtsi2ss %%eax, %%xmm2 # pSrc[pos_int] -> xmm2[0]\n\t"
281     "cvtsi2ss %%ecx, %%xmm3 # pSrc[pos_int] -> xmm3[0]\n\t"
282     "shufps $0x93, %%xmm2, %%xmm2 # shift up\n\t"
283     "shufps $0x93, %%xmm3, %%xmm3 # shift up\n\t"
284     "movd %%mm5,%%edi # sample position of sample 2\n\t"
285     "movswl (%0,%%edi,2),%%eax # pSrc[pos_int] (sample 3)\n\t"
286     "movswl 2(%0,%%edi,2),%%ecx # pSrc[pos_int] (sample 3+1)\n\t"
287     "cvtsi2ss %%eax, %%xmm2 # pSrc[pos_int] -> xmm2[0]\n\t"
288     "cvtsi2ss %%ecx, %%xmm3 # pSrc[pos_int] -> xmm3[0]\n\t"
289     "shufps $0x1b, %%xmm2, %%xmm2 # swap to correct order\n\t"
290     "shufps $0x1b, %%xmm3, %%xmm3 # swap to correct order\n\t"
291     : /* no output */
292     : "S" (pSrc) /* %0 - sample read position */
293     : "%eax", "%ecx", /*"%edx",*/ "%edi",
294     "%xmm2", /* holds pSrc[int_pos] of the 4 samples at the end */
295     "%xmm3", /* holds pSrc[int_pos+1] of the 4 samples at the end */
296     "mm4", /* holds integer position of sample 0-1 at the end */
297     "mm5", /* holds integer position of sample 2-3 at the end */
298     "st", "st(1)", "st(2)", "st(3)", "st(4)", "st(5)", "st(6)", "st(7)"
299     );
300     /* linear interpolation of the 4 samples simultaniously */
301     __asm__ __volatile__ (
302     "subps %%xmm2,%%xmm3 # xmm3 = pSrc[pos_int+1] - pSrc[pos_int]\n\t"
303     "mulps %%xmm0,%%xmm3 # xmm3 = pos_fract * (pSrc[pos_int+1] - pSrc[pos_int])\n\t"
304     "addps %%xmm3,%%xmm2 # xmm2 = pSrc[pos_int] + (pos_fract * (pSrc[pos_int+1] - pSrc[pos_int]))\n\t"
305     : /* no output */
306     : /* no input */
307     : "%xmm2" /* holds linear interpolated sample point (of all 4 samples) at the end */
308     );
309     }
310    
311     // TODO: no support for cubic interpolation yet
312     inline static void Interpolate4StepsStereoMMXSSE(sample_t* pSrc, void* Pos, float& Pitch) {
313     /* calculate playback position of each of the 4 samples by adding the associated pitch */
314     __asm__ __volatile__ (
315     "movss (%0),%%xmm0 # sample position of sample[0] -> xmm0[0]\n\t"
316     "movss %1,%%xmm1 # copy pitch -> xmm1[0]\n\t"
317     "shufps $0x90,%%xmm0,%%xmm0 # shift up, but keep xmm0[0]\n\t"
318     "addss %%xmm1,%%xmm0 # calculate sample position of sample[1]\n\t"
319     "shufps $0x90,%%xmm0,%%xmm0 # shift up, but keep xmm0[0]\n\t"
320     "addss %%xmm1,%%xmm0 # calculate sample position of sample[2]\n\t"
321     "shufps $0x90,%%xmm0,%%xmm0 # shift up, but keep xmm0[0]\n\t"
322     "addss %%xmm1,%%xmm0 # calculate sample position of sample[3]\n\t"
323     "movss %%xmm0,%%xmm2 # xmm0[0] -> xmm2[0]\n\t"
324     "addss %%xmm1,%%xmm2 # calculate initial sample position for the next 4-sample cycle\n\t"
325     "movss %%xmm2,(%0) # update 'Pos'\n\t"
326     "shufps $0x1b,%%xmm0,%%xmm0 # swap, so that xmm0[0]=sample pos 0, xmm0[1]=sample pos 1,...\n\t"
327     "cvttps2pi %%xmm0,%%mm4 # int(xmm0[0-1]) -> mm4\n\t"
328     "shufps $0xe4,%%xmm0,%%xmm1 # xmm0[2-3] -> xmm1[2-3]\n\t"
329     "shufps $0x0e,%%xmm1,%%xmm1 # xmm1[2-3] -> xmm1[0-1]\n\t"
330     "cvttps2pi %%xmm1,%%mm5 # int(xmm1[0-1]) -> mm5\n\t"
331     "cvtpi2ps %%mm5,%%xmm1 # double(mm5) -> xmm1[0-1]\n\t"
332     "shufps $0x44,%%xmm1,%%xmm1 # shift lower 2 FPs up to the upper 2 cells\n\t"
333     "cvtpi2ps %%mm4,%%xmm1 # double(mm4) -> xmm1[0-1]\n\t"
334     "subps %%xmm1,%%xmm0 # xmm0[1-3] = xmm0[1-3] - xmm1[1-3]\n\t"
335     :
336     : "r" (Pos), /* %0 */
337     "m" (Pitch) /* %1 */
338     : "%xmm0", /* holds fractional position (0.0 <= x < 1.0) of sample 0-3 at the end */
339     "%xmm1", /* holds integer position (back converted to SPFP) of sample 0-3 at the end */
340     "mm4", /* holds integer position of sample 0-1 at the end */
341     "mm5", /* holds integer position of sample 2-3 at the end */
342     "st", "st(1)", "st(2)", "st(3)", "st(4)", "st(5)", "st(6)", "st(7)"
343     );
344    
345     /* get sample values of pSrc[pos_int], pSrc[pos_int+1], pSrc[pos_int+2] and pSrc[pos_int+3] of the 4 samples */
346     __asm__ __volatile__ (
347     "xorl %%eax,%%eax # clear eax\n\t"
348     "xorl %%edx,%%edx # clear edx\n\t"
349     "movd %%mm4,%%edi # sample position of sample 0\n\t"
350     "psrlq $32,%%mm4 # mm4 >> 32\n\t"
351     "movswl (%0,%%edi,4),%%eax # pSrc[pos_int] (sample 0)\n\t"
352     "cvtsi2ss %%eax, %%xmm2 # pSrc[pos_int] -> xmm2[0]\n\t"
353     "shufps $0x93, %%xmm2, %%xmm2 # shift up\n\t"
354     "movswl 2(%0,%%edi,4),%%edx # pSrc[pos_int] (sample 0+1)\n\t"
355     "cvtsi2ss %%edx, %%xmm3 # pSrc[pos_int] -> xmm3[0]\n\t"
356     "shufps $0x93, %%xmm3, %%xmm3 # shift up\n\t"
357     "movswl 4(%0,%%edi,4),%%eax # pSrc[pos_int] (sample 0+2)\n\t"
358     "cvtsi2ss %%eax, %%xmm4 # pSrc[pos_int] -> xmm4[0]\n\t"
359     "shufps $0x93, %%xmm4, %%xmm4 # shift up\n\t"
360     "movswl 6(%0,%%edi,4),%%edx # pSrc[pos_int] (sample 0+3)\n\t"
361     "cvtsi2ss %%edx, %%xmm5 # pSrc[pos_int] -> xmm5[0]\n\t"
362     "movd %%mm4,%%edi # sample position of sample 1\n\t"
363     "shufps $0x93, %%xmm5, %%xmm5 # shift up\n\t"
364     "movswl (%0,%%edi,4),%%eax # pSrc[pos_int] (sample 1)\n\t"
365     "cvtsi2ss %%eax, %%xmm2 # pSrc[pos_int] -> xmm2[0]\n\t"
366     "shufps $0x93, %%xmm2, %%xmm2 # shift up\n\t"
367     "movswl 2(%0,%%edi,4),%%edx # pSrc[pos_int] (sample 1+1)\n\t"
368     "cvtsi2ss %%edx, %%xmm3 # pSrc[pos_int] -> xmm3[0]\n\t"
369     "shufps $0x93, %%xmm3, %%xmm3 # shift up\n\t"
370     "movswl 4(%0,%%edi,4),%%eax # pSrc[pos_int] (sample 1+2)\n\t"
371     "cvtsi2ss %%eax, %%xmm4 # pSrc[pos_int] -> xmm4[0]\n\t"
372     "shufps $0x93, %%xmm4, %%xmm4 # shift up\n\t"
373     "movswl 6(%0,%%edi,4),%%edx # pSrc[pos_int] (sample 1+3)\n\t"
374     "cvtsi2ss %%edx, %%xmm5 # pSrc[pos_int] -> xmm5[0]\n\t"
375     "movd %%mm5,%%edi # sample position of sample 2\n\t"
376     "shufps $0x93, %%xmm5, %%xmm5 # shift up\n\t"
377     "psrlq $32,%%mm5 # mm5 >> 32\n\t"
378     "movswl (%0,%%edi,4),%%eax # pSrc[pos_int] (sample 2)\n\t"
379     "cvtsi2ss %%eax, %%xmm2 # pSrc[pos_int] -> xmm2[0]\n\t"
380     "shufps $0x93, %%xmm2, %%xmm2 # shift up\n\t"
381     "movswl 2(%0,%%edi,4),%%edx # pSrc[pos_int] (sample 2+1)\n\t"
382     "cvtsi2ss %%edx, %%xmm3 # pSrc[pos_int] -> xmm3[0]\n\t"
383     "shufps $0x93, %%xmm3, %%xmm3 # shift up\n\t"
384     "movswl 4(%0,%%edi,4),%%eax # pSrc[pos_int] (sample 2+2)\n\t"
385     "cvtsi2ss %%eax, %%xmm4 # pSrc[pos_int] -> xmm4[0]\n\t"
386     "shufps $0x93, %%xmm4, %%xmm4 # shift up\n\t"
387     "movswl 6(%0,%%edi,4),%%edx # pSrc[pos_int] (sample 2+3)\n\t"
388     "cvtsi2ss %%edx, %%xmm5 # pSrc[pos_int] -> xmm5[0]\n\t"
389     "movd %%mm5,%%edi # sample position of sample 3\n\t"
390     "shufps $0x93, %%xmm5, %%xmm5 # shift up\n\t"
391     "movswl (%0,%%edi,4),%%eax # pSrc[pos_int] (sample 3)\n\t"
392     "cvtsi2ss %%eax, %%xmm2 # pSrc[pos_int] -> xmm2[0]\n\t"
393     "shufps $0x1b, %%xmm2, %%xmm2 # shift up\n\t"
394     "movswl 2(%0,%%edi,4),%%edx # pSrc[pos_int] (sample 3+1)\n\t"
395     "cvtsi2ss %%edx, %%xmm3 # pSrc[pos_int] -> xmm3[0]\n\t"
396     "shufps $0x1b, %%xmm3, %%xmm3 # shift up\n\t"
397     "movswl 4(%0,%%edi,4),%%eax # pSrc[pos_int] (sample 3+2)\n\t"
398     "cvtsi2ss %%eax, %%xmm4 # pSrc[pos_int] -> xmm4[0]\n\t"
399     "shufps $0x1b, %%xmm4, %%xmm4 # swap to correct order\n\t"
400     "movswl 6(%0,%%edi,4),%%edx # pSrc[pos_int] (sample 3+3)\n\t"
401     "cvtsi2ss %%edx, %%xmm5 # pSrc[pos_int] -> xmm5[0]\n\t"
402     "shufps $0x1b, %%xmm5, %%xmm5 # swap to correct order\n\t"
403     : /* no output */
404     : "S" (pSrc) /* %0 - sample read position */
405     : "%eax", "%edx", "%edi",
406     "xmm2", /* holds pSrc[int_pos] of the 4 samples at the end */
407     "xmm3", /* holds pSrc[int_pos+1] of the 4 samples at the end */
408     "xmm4", /* holds pSrc[int_pos+2] of the 4 samples at the end */
409     "xmm5", /* holds pSrc[int_pos+3] of the 4 samples at the end */
410     "mm4", /* holds integer position of sample 0-1 at the end */
411     "mm5", /* holds integer position of sample 2-3 at the end */
412     "st", "st(1)", "st(2)", "st(3)", "st(4)", "st(5)", "st(6)", "st(7)"
413     );
414     /* linear interpolation of the 4 samples (left & right channel) simultaniously */
415     __asm__ __volatile__ (
416     "subps %%xmm2,%%xmm4 # xmm4 = pSrc[pos_int+2] - pSrc[pos_int] (left channel)\n\t"
417     "mulps %%xmm0,%%xmm4 # xmm4 = pos_fract * (pSrc[pos_int+2] - pSrc[pos_int]) (left channel)\n\t"
418     "addps %%xmm4,%%xmm2 # xmm2 = pSrc[pos_int] + (pos_fract * (pSrc[pos_int+2] - pSrc[pos_int])) (left channel)\n\t"
419     "subps %%xmm3,%%xmm5 # xmm5 = pSrc[pos_int+3] - pSrc[pos_int+1] (right channel)\n\t"
420     "mulps %%xmm0,%%xmm5 # xmm5 = pos_fract * (pSrc[pos_int+3] - pSrc[pos_int+1]) (right channel)\n\t"
421     "addps %%xmm5,%%xmm3 # xmm3 = pSrc[pos_int+1] + (pos_fract * (pSrc[pos_int+3] - pSrc[pos_int+1])) (right channel)\n\t"
422     : /* no output */
423     : /* no input */
424     : "%xmm2", /* holds linear interpolated sample of left channel (of all 4 samples) at the end */
425     "%xmm3" /* holds linear interpolated sample of right channel (of all 4 samples) at the end */
426     );
427     }
428 schoenebeck 617 #endif // CONFIG_ASM && ARCH_X86
429 schoenebeck 320 };
430    
431     } // namespace LinuxSampler
432    
433     #endif // __LS_RESAMPLER_H__

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