memops.c 17.7 KB
Newer Older
sletz's avatar
sletz committed
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
/*
    Copyright (C) 2000 Paul Davis 

    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation; either version 2 of the License, or
    (at your option) any later version.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with this program; if not, write to the Free Software
    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.

*/

#define _ISOC9X_SOURCE  1
#define _ISOC99_SOURCE  1

#define __USE_ISOC9X    1
#define __USE_ISOC99    1

#include <stdio.h>
#include <string.h>
#include <math.h>
#include <memory.h>
#include <stdlib.h>
31
#include <stdint.h>
sletz's avatar
sletz committed
32
#include <limits.h>
sletz's avatar
sletz committed
33
#include <endian.h>
34

sletz's avatar
sletz committed
35
36
#include "memops.h"

37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
/* Notes about these *_SCALING values.

   the MAX_<N>BIT values are floating point. when multiplied by
   a full-scale normalized floating point sample value (-1.0..+1.0)
   they should give the maxium value representable with an integer
   sample type of N bits. Note that this is asymmetric. Sample ranges 
   for signed integer, 2's complement values are -(2^(N-1) to +(2^(N-1)-1)

   Complications
   -------------
   If we use +2^(N-1) for the scaling factors, we run into a problem:

   if we start with a normalized float value of -1.0, scaling
   to 24 bits would give -8388608 (-2^23), which is ideal.
   But with +1.0, we get +8388608, which is technically out of range.

   We never multiply a full range normalized value by this constant,
   but we could multiply it by a positive value that is close enough to +1.0
   to produce a value > +(2^(N-1)-1.

   There is no way around this paradox without wasting CPU cycles to determine
   which scaling factor to use (i.e. determine if its negative or not,
   use the right factor).

   So, for now (October 2008) we use 2^(N-1)-1 as the scaling factor.
*/

#define SAMPLE_24BIT_SCALING  8388607.0f
#define SAMPLE_16BIT_SCALING  32767.0f

/* these are just values to use if the floating point value was out of range
   
   advice from Fons Adriaensen: make the limits symmetrical
 */

#define SAMPLE_24BIT_MAX  8388607  
#define SAMPLE_24BIT_MIN  -8388607 
#define SAMPLE_24BIT_MAX_F  8388607.0f  
#define SAMPLE_24BIT_MIN_F  -8388607.0f 

#define SAMPLE_16BIT_MAX  32767
#define SAMPLE_16BIT_MIN  -32767
#define SAMPLE_16BIT_MAX_F  32767.0f
#define SAMPLE_16BIT_MIN_F  -32767.0f

/* these mark the outer edges of the range considered "within" range
   for a floating point sample value. values outside (and on the boundaries) 
   of this range will be clipped before conversion; values within this 
   range will be scaled to appropriate values for the target sample
   type.
*/

#define NORMALIZED_FLOAT_MIN -1.0f
#define NORMALIZED_FLOAT_MAX  1.0f
sletz's avatar
sletz committed
91

92
93
94
/* define this in case we end up on a platform that is missing
   the real lrintf functions
*/
sletz's avatar
sletz committed
95
96
97

#define f_round(f) lrintf(f)

98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
#define float_16(s, d)\
	if ((s) <= NORMALIZED_FLOAT_MIN) {\
		(d) = SAMPLE_16BIT_MIN;\
	} else if ((s) >= NORMALIZED_FLOAT_MAX) {\
		(d) = SAMPLE_16BIT_MAX;\
	} else {\
		(d) = f_round ((s) * SAMPLE_16BIT_SCALING);\
	}

/* call this when "s" has already been scaled (e.g. when dithering)
 */

#define float_16_scaled(s, d)\
        if ((s) <= SAMPLE_16BIT_MIN_F) {\
		(d) = SAMPLE_16BIT_MIN_F;\
	} else if ((s) >= SAMPLE_16BIT_MAX_F) {	\
		(d) = SAMPLE_16BIT_MAX;\
	} else {\
	        (d) = f_round ((s));\
	}

#define float_24u32(s, d) \
	if ((s) <= NORMALIZED_FLOAT_MIN) {\
		(d) = SAMPLE_24BIT_MIN << 8;\
	} else if ((s) >= NORMALIZED_FLOAT_MAX) {\
		(d) = SAMPLE_24BIT_MAX << 8;\
	} else {\
		(d) = f_round ((s) * SAMPLE_24BIT_SCALING) << 8;\
	}

/* call this when "s" has already been scaled (e.g. when dithering)
 */

#define float_24u32_scaled(s, d)\
        if ((s) <= SAMPLE_24BIT_MIN_F) {\
		(d) = SAMPLE_24BIT_MIN << 8;\
	} else if ((s) >= SAMPLE_24BIT_MAX_F) {	\
		(d) = SAMPLE_24BIT_MAX << 8;		\
	} else {\
		(d) = f_round ((s)) << 8; \
	}

#define float_24(s, d) \
	if ((s) <= NORMALIZED_FLOAT_MIN) {\
		(d) = SAMPLE_24BIT_MIN;\
	} else if ((s) >= NORMALIZED_FLOAT_MAX) {\
		(d) = SAMPLE_24BIT_MAX;\
	} else {\
		(d) = f_round ((s) * SAMPLE_24BIT_SCALING);\
	}

/* call this when "s" has already been scaled (e.g. when dithering)
 */

#define float_24_scaled(s, d)\
        if ((s) <= SAMPLE_24BIT_MIN_F) {\
		(d) = SAMPLE_24BIT_MIN;\
	} else if ((s) >= SAMPLE_24BIT_MAX_F) {	\
		(d) = SAMPLE_24BIT_MAX;		\
	} else {\
		(d) = f_round ((s)); \
	}


sletz's avatar
sletz committed
162
/* Linear Congruential noise generator. From the music-dsp list
163
164
 * less random than rand(), but good enough and 10x faster 
 */
sletz's avatar
sletz committed
165
166
167
168
169
170
171
172

inline unsigned int fast_rand() {
	static unsigned int seed = 22222;
	seed = (seed * 96314165) + 907633515;

	return seed;
}

173
174
175
176

/* functions for native float sample data */

void sample_move_floatLE_sSs (jack_default_audio_sample_t *dst, char *src, unsigned long nsamples, unsigned long src_skip) {
177
178
179
180
181
	while (nsamples--) {
		*dst = *((float *) src);
		dst++;
		src += src_skip;
	}
182
183
184
}

void sample_move_dS_floatLE (char *dst, jack_default_audio_sample_t *src, unsigned long nsamples, unsigned long dst_skip, dither_state_t *state) {
185
186
187
188
189
	while (nsamples--) {
		*((float *) dst) = *src;
		dst += dst_skip;
		src++;
	}
190
191
}

192
/* NOTES on function naming:
193

194
   foo_bar_d<TYPE>_s<TYPE>
195

196
197
   the "d<TYPE>" component defines the destination type for the operation
   the "s<TYPE>" component defines the source type for the operation
198

199
200
201
202
203
204
205
206
207
208
   TYPE can be one of:
   
   S      - sample is a jack_default_audio_sample_t, currently (October 2008) a 32 bit floating point value
   Ss     - like S but reverse endian from the host CPU
   32u24  - sample is an signed 32 bit integer value, but data is in upper 24 bits only
   32u24s - like 32u24 but reverse endian from the host CPU
   24     - sample is an signed 24 bit integer value
   24s    - like 24 but reverse endian from the host CPU
   16     - sample is an signed 16 bit integer value
   16s    - like 16 but reverse endian from the host CPU
sletz's avatar
sletz committed
209

210
211
212
213
214
215
216
217
   For obvious reasons, the reverse endian versions only show as source types.

   This covers all known sample formats at 16 bits or larger.
*/   

/* functions for native integer sample data */

void sample_move_d32u24_sSs (char *dst, jack_default_audio_sample_t *src, unsigned long nsamples, unsigned long dst_skip, dither_state_t *state)
sletz's avatar
sletz committed
218
{
219
	int32_t z;
sletz's avatar
sletz committed
220
221

	while (nsamples--) {
222
223
224
225

		float_24u32 (*src, z);


sletz's avatar
sletz committed
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
#if __BYTE_ORDER == __LITTLE_ENDIAN
		dst[0]=(char)(z>>24);
		dst[1]=(char)(z>>16);
		dst[2]=(char)(z>>8);
		dst[3]=(char)(z);
#elif __BYTE_ORDER == __BIG_ENDIAN
		dst[0]=(char)(z);
		dst[1]=(char)(z>>8);
		dst[2]=(char)(z>>16);
		dst[3]=(char)(z>>24);
#endif
		dst += dst_skip;
		src++;
	}
}	

sletz's avatar
sletz committed
242
243
244
void sample_move_d32u24_sS (char *dst, jack_default_audio_sample_t *src, unsigned long nsamples, unsigned long dst_skip, dither_state_t *state)
{
	while (nsamples--) {
245
		float_24u32 (*src, *((int32_t*) dst));
sletz's avatar
sletz committed
246
247
248
249
250
		dst += dst_skip;
		src++;
	}
}	

sletz's avatar
sletz committed
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
void sample_move_dS_s32u24s (jack_default_audio_sample_t *dst, char *src, unsigned long nsamples, unsigned long src_skip)
{
	/* ALERT: signed sign-extension portability !!! */

	while (nsamples--) {
		int x;
#if __BYTE_ORDER == __LITTLE_ENDIAN
		x = (unsigned char)(src[0]);
		x <<= 8;
		x |= (unsigned char)(src[1]);
		x <<= 8;
		x |= (unsigned char)(src[2]);
		x <<= 8;
		x |= (unsigned char)(src[3]);
#elif __BYTE_ORDER == __BIG_ENDIAN
		x = (unsigned char)(src[3]);
		x <<= 8;
		x |= (unsigned char)(src[2]);
		x <<= 8;
		x |= (unsigned char)(src[1]);
		x <<= 8;
		x |= (unsigned char)(src[0]);
#endif
274
		*dst = (x >> 8) / SAMPLE_24BIT_SCALING;
sletz's avatar
sletz committed
275
276
277
278
279
		dst++;
		src += src_skip;
	}
}	

sletz's avatar
sletz committed
280
281
282
283
284
void sample_move_dS_s32u24 (jack_default_audio_sample_t *dst, char *src, unsigned long nsamples, unsigned long src_skip)
{
	/* ALERT: signed sign-extension portability !!! */

	while (nsamples--) {
285
		*dst = (*((int *) src) >> 8) / SAMPLE_24BIT_SCALING;
sletz's avatar
sletz committed
286
287
288
289
290
		dst++;
		src += src_skip;
	}
}	

sletz's avatar
sletz committed
291
292
void sample_move_d24_sSs (char *dst, jack_default_audio_sample_t *src, unsigned long nsamples, unsigned long dst_skip, dither_state_t *state)
{
293
	int32_t z;
sletz's avatar
sletz committed
294
295

	while (nsamples--) {
296
		float_24 (*src, z);
sletz's avatar
sletz committed
297
298
299
300
301
302
303
304
305
306
307
308
309
310
#if __BYTE_ORDER == __LITTLE_ENDIAN
		dst[0]=(char)(z>>16);
		dst[1]=(char)(z>>8);
		dst[2]=(char)(z);
#elif __BYTE_ORDER == __BIG_ENDIAN
		dst[0]=(char)(z);
		dst[1]=(char)(z>>8);
		dst[2]=(char)(z>>16);
#endif
		dst += dst_skip;
		src++;
	}
}	

sletz's avatar
sletz committed
311
312
void sample_move_d24_sS (char *dst, jack_default_audio_sample_t *src, unsigned long nsamples, unsigned long dst_skip, dither_state_t *state)
{
313
314
        int32_t z;
	
sletz's avatar
sletz committed
315
	while (nsamples--) {
316
		float_24 (*src, z);
sletz's avatar
sletz committed
317
#if __BYTE_ORDER == __LITTLE_ENDIAN
318
		memcpy (dst, &z, 3);
sletz's avatar
sletz committed
319
#elif __BYTE_ORDER == __BIG_ENDIAN
320
		memcpy (dst, (char *)&z + 1, 3);
sletz's avatar
sletz committed
321
322
323
324
325
326
#endif
		dst += dst_skip;
		src++;
	}
}	

sletz's avatar
sletz committed
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
void sample_move_dS_s24s (jack_default_audio_sample_t *dst, char *src, unsigned long nsamples, unsigned long src_skip)
{
	/* ALERT: signed sign-extension portability !!! */

	while (nsamples--) {
		int x;
#if __BYTE_ORDER == __LITTLE_ENDIAN
		x = (unsigned char)(src[0]);
		x <<= 8;
		x |= (unsigned char)(src[1]);
		x <<= 8;
		x |= (unsigned char)(src[2]);
		/* correct sign bit and the rest of the top byte */
		if (src[0] & 0x80) {
			x |= 0xff << 24;
		}
#elif __BYTE_ORDER == __BIG_ENDIAN
		x = (unsigned char)(src[2]);
		x <<= 8;
		x |= (unsigned char)(src[1]);
		x <<= 8;
		x |= (unsigned char)(src[0]);
		/* correct sign bit and the rest of the top byte */
		if (src[0] & 0x80) {
			x |= 0xff << 24;
		}
#endif
354
		*dst = x / SAMPLE_24BIT_SCALING;
sletz's avatar
sletz committed
355
356
357
358
359
		dst++;
		src += src_skip;
	}
}	

sletz's avatar
sletz committed
360
361
362
363
364
365
366
367
368
369
370
371
void sample_move_dS_s24 (jack_default_audio_sample_t *dst, char *src, unsigned long nsamples, unsigned long src_skip)
{
	/* ALERT: signed sign-extension portability !!! */

	while (nsamples--) {
		int x;
#if __BYTE_ORDER == __LITTLE_ENDIAN
		memcpy((char*)&x + 1, src, 3);
#elif __BYTE_ORDER == __BIG_ENDIAN
		memcpy(&x, src, 3);
#endif
		x >>= 8;
372
		*dst = x / SAMPLE_24BIT_SCALING;
sletz's avatar
sletz committed
373
374
375
376
377
		dst++;
		src += src_skip;
	}
}	

sletz's avatar
sletz committed
378

379
void sample_move_d16_sSs (char *dst,  jack_default_audio_sample_t *src, unsigned long nsamples, unsigned long dst_skip, dither_state_t *state)	
sletz's avatar
sletz committed
380
{
381
	int16_t tmp;
sletz's avatar
sletz committed
382
383

	while (nsamples--) {
384
		// float_16 (*src, tmp);
sletz's avatar
sletz committed
385

386
387
388
389
		if (*src <= NORMALIZED_FLOAT_MIN) {
			tmp = SAMPLE_16BIT_MIN;
		} else if (*src >= NORMALIZED_FLOAT_MAX) {
			tmp = SAMPLE_16BIT_MAX;
sletz's avatar
sletz committed
390
		} else {
391
			tmp = (int16_t) f_round (*src * SAMPLE_16BIT_SCALING);
sletz's avatar
sletz committed
392
		}
sletz's avatar
sletz committed
393

sletz's avatar
sletz committed
394
395
396
397
398
399
400
401
402
403
404
405
#if __BYTE_ORDER == __LITTLE_ENDIAN
		dst[0]=(char)(tmp>>8);
		dst[1]=(char)(tmp);
#elif __BYTE_ORDER == __BIG_ENDIAN
		dst[0]=(char)(tmp);
		dst[1]=(char)(tmp>>8);
#endif
		dst += dst_skip;
		src++;
	}
}

406
void sample_move_d16_sS (char *dst,  jack_default_audio_sample_t *src, unsigned long nsamples, unsigned long dst_skip, dither_state_t *state)	
sletz's avatar
sletz committed
407
408
{
	while (nsamples--) {
409
		float_16 (*src, *((int16_t*) dst));
sletz's avatar
sletz committed
410
411
412
413
414
		dst += dst_skip;
		src++;
	}
}

415
void sample_move_dither_rect_d16_sSs (char *dst,  jack_default_audio_sample_t *src, unsigned long nsamples, unsigned long dst_skip, dither_state_t *state)	
sletz's avatar
sletz committed
416
417
{
	jack_default_audio_sample_t val;
418
	int16_t      tmp;
sletz's avatar
sletz committed
419
420

	while (nsamples--) {
421
422
		val = (*src * SAMPLE_16BIT_SCALING) + fast_rand() / (float) UINT_MAX - 0.5f;
		float_16_scaled (val, tmp);
sletz's avatar
sletz committed
423
424
425
426
427
428
429
430
431
432
433
434
#if __BYTE_ORDER == __LITTLE_ENDIAN
		dst[0]=(char)(tmp>>8);
		dst[1]=(char)(tmp);
#elif __BYTE_ORDER == __BIG_ENDIAN
		dst[0]=(char)(tmp);
		dst[1]=(char)(tmp>>8);
#endif
		dst += dst_skip;
		src++;
	}
}

435
void sample_move_dither_rect_d16_sS (char *dst,  jack_default_audio_sample_t *src, unsigned long nsamples, unsigned long dst_skip, dither_state_t *state)	
sletz's avatar
sletz committed
436
437
438
439
{
	jack_default_audio_sample_t val;

	while (nsamples--) {
440
441
		val = (*src * SAMPLE_16BIT_SCALING) + fast_rand() / (float)UINT_MAX - 0.5f;
		float_16_scaled (val, *((int16_t*) dst));
sletz's avatar
sletz committed
442
443
444
445
446
		dst += dst_skip;
		src++;
	}
}

447
void sample_move_dither_tri_d16_sSs (char *dst,  jack_default_audio_sample_t *src, unsigned long nsamples, unsigned long dst_skip, dither_state_t *state)	
sletz's avatar
sletz committed
448
{
449
450
	jack_default_audio_sample_t val;
	int16_t      tmp;
sletz's avatar
sletz committed
451
452

	while (nsamples--) {
453
454
		val = (*src * SAMPLE_16BIT_SCALING) + ((float)fast_rand() + (float)fast_rand()) / (float)UINT_MAX - 1.0f;
		float_16_scaled (val, tmp);
sletz's avatar
sletz committed
455
456

#if __BYTE_ORDER == __LITTLE_ENDIAN
457
458
		dst[0]=(char)(tmp>>8);
		dst[1]=(char)(tmp);
sletz's avatar
sletz committed
459
#elif __BYTE_ORDER == __BIG_ENDIAN
460
461
		dst[0]=(char)(tmp);
		dst[1]=(char)(tmp>>8);
sletz's avatar
sletz committed
462
463
464
465
466
467
#endif
		dst += dst_skip;
		src++;
	}
}

468
void sample_move_dither_tri_d16_sS (char *dst,  jack_default_audio_sample_t *src, unsigned long nsamples, unsigned long dst_skip, dither_state_t *state)	
sletz's avatar
sletz committed
469
{
470
	jack_default_audio_sample_t val;
sletz's avatar
sletz committed
471
472

	while (nsamples--) {
473
474
		val = (*src * SAMPLE_16BIT_SCALING) + ((float)fast_rand() + (float)fast_rand()) / (float)UINT_MAX - 1.0f;
		float_16_scaled (val, *((int16_t*) dst));
sletz's avatar
sletz committed
475
476
477
478
479
		dst += dst_skip;
		src++;
	}
}

480
void sample_move_dither_shaped_d16_sSs (char *dst,  jack_default_audio_sample_t *src, unsigned long nsamples, unsigned long dst_skip, dither_state_t *state)	
sletz's avatar
sletz committed
481
482
483
484
485
486
487
{
	jack_default_audio_sample_t     x;
	jack_default_audio_sample_t     xe; /* the innput sample - filtered error */
	jack_default_audio_sample_t     xp; /* x' */
	float        r;
	float        rm1 = state->rm1;
	unsigned int idx = state->idx;
488
	int16_t      tmp;
sletz's avatar
sletz committed
489
490

	while (nsamples--) {
491
492
		x = *src * SAMPLE_16BIT_SCALING;
		r = ((float)fast_rand() + (float)fast_rand())  / (float)UINT_MAX - 1.0f;
sletz's avatar
sletz committed
493
494
495
496
497
498
499
500
501
502
503
		/* Filter the error with Lipshitz's minimally audible FIR:
		   [2.033 -2.165 1.959 -1.590 0.6149] */
		xe = x
		     - state->e[idx] * 2.033f
		     + state->e[(idx - 1) & DITHER_BUF_MASK] * 2.165f
		     - state->e[(idx - 2) & DITHER_BUF_MASK] * 1.959f
		     + state->e[(idx - 3) & DITHER_BUF_MASK] * 1.590f
		     - state->e[(idx - 4) & DITHER_BUF_MASK] * 0.6149f;
		xp = xe + r - rm1;
		rm1 = r;

504
		float_16_scaled (xp, tmp);
sletz's avatar
sletz committed
505
506
507

		/* Intrinsic z^-1 delay */
		idx = (idx + 1) & DITHER_BUF_MASK;
508
		state->e[idx] = xp - xe;
sletz's avatar
sletz committed
509
510

#if __BYTE_ORDER == __LITTLE_ENDIAN
511
512
		dst[0]=(char)(tmp>>8);
		dst[1]=(char)(tmp);
sletz's avatar
sletz committed
513
#elif __BYTE_ORDER == __BIG_ENDIAN
514
515
		dst[0]=(char)(tmp);
		dst[1]=(char)(tmp>>8);
sletz's avatar
sletz committed
516
517
518
519
520
521
522
523
#endif
		dst += dst_skip;
		src++;
	}
	state->rm1 = rm1;
	state->idx = idx;
}

524
void sample_move_dither_shaped_d16_sS (char *dst,  jack_default_audio_sample_t *src, unsigned long nsamples, unsigned long dst_skip, dither_state_t *state)	
sletz's avatar
sletz committed
525
526
527
528
529
530
531
532
533
{
	jack_default_audio_sample_t     x;
	jack_default_audio_sample_t     xe; /* the innput sample - filtered error */
	jack_default_audio_sample_t     xp; /* x' */
	float        r;
	float        rm1 = state->rm1;
	unsigned int idx = state->idx;

	while (nsamples--) {
534
535
		x = *src * SAMPLE_16BIT_SCALING;
		r = ((float)fast_rand() + (float)fast_rand()) / (float)UINT_MAX - 1.0f;
sletz's avatar
sletz committed
536
537
538
539
540
541
542
543
544
545
546
		/* Filter the error with Lipshitz's minimally audible FIR:
		   [2.033 -2.165 1.959 -1.590 0.6149] */
		xe = x
		     - state->e[idx] * 2.033f
		     + state->e[(idx - 1) & DITHER_BUF_MASK] * 2.165f
		     - state->e[(idx - 2) & DITHER_BUF_MASK] * 1.959f
		     + state->e[(idx - 3) & DITHER_BUF_MASK] * 1.590f
		     - state->e[(idx - 4) & DITHER_BUF_MASK] * 0.6149f;
		xp = xe + r - rm1;
		rm1 = r;

547
		float_16_scaled (xp, *((int16_t*) dst));
sletz's avatar
sletz committed
548
549
550

		/* Intrinsic z^-1 delay */
		idx = (idx + 1) & DITHER_BUF_MASK;
551
		state->e[idx] = *((int16_t*) dst) - xe;
sletz's avatar
sletz committed
552
553
554
555
556
557
558
559

		dst += dst_skip;
		src++;
	}
	state->rm1 = rm1;
	state->idx = idx;
}

560
void sample_move_dS_s16s (jack_default_audio_sample_t *dst, char *src, unsigned long nsamples, unsigned long src_skip) 	
sletz's avatar
sletz committed
561
562
563
564
565
566
567
568
569
570
571
572
573
574
{
	short z;

	/* ALERT: signed sign-extension portability !!! */
	while (nsamples--) {
#if __BYTE_ORDER == __LITTLE_ENDIAN
		z = (unsigned char)(src[0]);
		z <<= 8;
		z |= (unsigned char)(src[1]);
#elif __BYTE_ORDER == __BIG_ENDIAN
		z = (unsigned char)(src[1]);
		z <<= 8;
		z |= (unsigned char)(src[0]);
#endif
575
		*dst = z / SAMPLE_16BIT_SCALING;
sletz's avatar
sletz committed
576
577
578
579
580
		dst++;
		src += src_skip;
	}
}	

sletz's avatar
sletz committed
581
582
583
584
585
void sample_move_dS_s16 (jack_default_audio_sample_t *dst, char *src, unsigned long nsamples, unsigned long src_skip) 
	
{
	/* ALERT: signed sign-extension portability !!! */
	while (nsamples--) {
586
		*dst = (*((short *) src)) / SAMPLE_16BIT_SCALING;
sletz's avatar
sletz committed
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
		dst++;
		src += src_skip;
	}
}	

void memset_interleave (char *dst, char val, unsigned long bytes, 
			unsigned long unit_bytes, 
			unsigned long skip_bytes) 
{
	switch (unit_bytes) {
	case 1:
		while (bytes--) {
			*dst = val;
			dst += skip_bytes;
		}
		break;
	case 2:
		while (bytes) {
			*((short *) dst) = (short) val;
			dst += skip_bytes;
			bytes -= 2;
		}
		break;
	case 4:		    
		while (bytes) {
			*((int *) dst) = (int) val;
			dst += skip_bytes;
			bytes -= 4;
		}
		break;
	default:
		while (bytes) {
			memset(dst, val, unit_bytes);
			dst += skip_bytes;
			bytes -= unit_bytes;
		}
		break;
	}
}

/* COPY FUNCTIONS: used to move data from an input channel to an
   output channel. Note that we assume that the skip distance
   is the same for both channels. This is completely fine
   unless the input and output were on different audio interfaces that
   were interleaved differently. We don't try to handle that.
*/

void 
memcpy_fake (char *dst, char *src, unsigned long src_bytes, unsigned long foo, unsigned long bar)
{
	memcpy (dst, src, src_bytes);
}

void 
memcpy_interleave_d16_s16 (char *dst, char *src, unsigned long src_bytes,
			   unsigned long dst_skip_bytes, unsigned long src_skip_bytes)
{
	while (src_bytes) {
		*((short *) dst) = *((short *) src);
		dst += dst_skip_bytes;
		src += src_skip_bytes;
		src_bytes -= 2;
	}
}

void 
memcpy_interleave_d24_s24 (char *dst, char *src, unsigned long src_bytes,
			   unsigned long dst_skip_bytes, unsigned long src_skip_bytes)

{
	while (src_bytes) {
		memcpy(dst, src, 3);
		dst += dst_skip_bytes;
		src += src_skip_bytes;
		src_bytes -= 3;
	}
}

void 
memcpy_interleave_d32_s32 (char *dst, char *src, unsigned long src_bytes,
			   unsigned long dst_skip_bytes, unsigned long src_skip_bytes)

{
	while (src_bytes) {
		*((int *) dst) = *((int *) src);
		dst += dst_skip_bytes;
		src += src_skip_bytes;
		src_bytes -= 4;
	}
}
677