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jack1/drivers/alsa/memops.c

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  1. /*

  2.     Copyright (C) 2000 Paul Davis 

  3. 

  4.     This program is free software; you can redistribute it and/or modify

  5.     it under the terms of the GNU General Public License as published by

  6.     the Free Software Foundation; either version 2 of the License, or

  7.     (at your option) any later version.

  8. 

  9.     This program is distributed in the hope that it will be useful,

  10.     but WITHOUT ANY WARRANTY; without even the implied warranty of

  11.     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

  12.     GNU General Public License for more details.

  13. 

  14.     You should have received a copy of the GNU General Public License

  15.     along with this program; if not, write to the Free Software

  16.     Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.

  17. 

  18. */

  19. 

  20. #define _ISOC9X_SOURCE  1

  21. #define _ISOC99_SOURCE  1

  22. 

  23. #define __USE_ISOC9X    1

  24. #define __USE_ISOC99    1

  25. 

  26. #include <stdio.h>

  27. #include <string.h>

  28. #include <math.h>

  29. #include <memory.h>

  30. #include <stdlib.h>

  31. #include <limits.h>

  32. #include <endian.h>

  33. 

  34. #include <jack/memops.h>

  35. 

  36. #define SAMPLE_MAX_24BIT  8388608.0f

  37. #define SAMPLE_MAX_16BIT  32768.0f

  38. 

  39. #define f_round(f) lrintf(f)

  40. 

  41. /* Linear Congruential noise generator. From the music-dsp list

  42.  * less random than rand(), but good enough and 10x faster */

  43. inline unsigned int fast_rand();

  44. 

  45. inline unsigned int fast_rand() {

  46. 	static unsigned int seed = 22222;

  47. 	seed = (seed * 96314165) + 907633515;

  48. 

  49. 	return seed;

  50. }

  51. 

  52. 

  53. /* functions for native float sample data */

  54. 

  55. void sample_move_floatLE_sSs (jack_default_audio_sample_t *dst, char *src, unsigned long nsamples, unsigned long src_skip) {

  56. 	while (nsamples--) {

  57. 		*dst = *((float *) src);

  58. 		dst++;

  59. 		src += src_skip;

  60. 	}

  61. }

  62. 

  63. void sample_move_dS_floatLE (char *dst, jack_default_audio_sample_t *src, unsigned long nsamples, unsigned long dst_skip, dither_state_t *state) {

  64. 	while (nsamples--) {

  65. 		*((float *) dst) = *src;

  66. 		dst += dst_skip;

  67. 		src++;

  68. 	}

  69. }

  70. 

  71. /* functions for native integer sample data */

  72. 

  73. void sample_move_d32u24_sSs (char *dst, jack_default_audio_sample_t *src, unsigned long nsamples, unsigned long dst_skip, dither_state_t *state)

  74. {

  75.         long long y;

  76. 	int z;

  77. 

  78. 	while (nsamples--) {

  79. 		y = (long long)(*src * SAMPLE_MAX_24BIT) << 8;

  80. 		if (y > INT_MAX) {

  81. 			z = INT_MAX;

  82. 		} else if (y < INT_MIN) {

  83. 			z = INT_MIN;

  84. 		} else {

  85. 			z = (int)y;

  86. 		}

  87. #if __BYTE_ORDER == __LITTLE_ENDIAN

  88. 		dst[0]=(char)(z>>24);

  89. 		dst[1]=(char)(z>>16);

  90. 		dst[2]=(char)(z>>8);

  91. 		dst[3]=(char)(z);

  92. #elif __BYTE_ORDER == __BIG_ENDIAN

  93. 		dst[0]=(char)(z);

  94. 		dst[1]=(char)(z>>8);

  95. 		dst[2]=(char)(z>>16);

  96. 		dst[3]=(char)(z>>24);

  97. #endif

  98. 		dst += dst_skip;

  99. 		src++;

  100. 	}

  101. }	

  102. 

  103. void sample_move_d32u24_sS (char *dst, jack_default_audio_sample_t *src, unsigned long nsamples, unsigned long dst_skip, dither_state_t *state)

  104. {

  105.     long long y;

  106. 

  107. 	while (nsamples--) {

  108. 		y = (long long)(*src * SAMPLE_MAX_24BIT) << 8;

  109. 		if (y > INT_MAX) {

  110. 			*((int *) dst) = INT_MAX;

  111. 		} else if (y < INT_MIN) {

  112. 			*((int *) dst) = INT_MIN;

  113. 		} else {

  114. 			*((int *) dst) = (int)y;

  115. 		}

  116. 		dst += dst_skip;

  117. 		src++;

  118. 	}

  119. }	

  120. 

  121. void sample_move_dS_s32u24s (jack_default_audio_sample_t *dst, char *src, unsigned long nsamples, unsigned long src_skip)

  122. {

  123. 	/* ALERT: signed sign-extension portability !!! */

  124. 

  125. 	while (nsamples--) {

  126. 		int x;

  127. #if __BYTE_ORDER == __LITTLE_ENDIAN

  128. 		x = (unsigned char)(src[0]);

  129. 		x <<= 8;

  130. 		x |= (unsigned char)(src[1]);

  131. 		x <<= 8;

  132. 		x |= (unsigned char)(src[2]);

  133. 		x <<= 8;

  134. 		x |= (unsigned char)(src[3]);

  135. #elif __BYTE_ORDER == __BIG_ENDIAN

  136. 		x = (unsigned char)(src[3]);

  137. 		x <<= 8;

  138. 		x |= (unsigned char)(src[2]);

  139. 		x <<= 8;

  140. 		x |= (unsigned char)(src[1]);

  141. 		x <<= 8;

  142. 		x |= (unsigned char)(src[0]);

  143. #endif

  144. 		*dst = (x >> 8) / SAMPLE_MAX_24BIT;

  145. 		dst++;

  146. 		src += src_skip;

  147. 	}

  148. }	

  149. 

  150. void sample_move_dS_s32u24 (jack_default_audio_sample_t *dst, char *src, unsigned long nsamples, unsigned long src_skip)

  151. {

  152. 	/* ALERT: signed sign-extension portability !!! */

  153. 

  154. 	while (nsamples--) {

  155. 		*dst = (*((int *) src) >> 8) / SAMPLE_MAX_24BIT;

  156. 		dst++;

  157. 		src += src_skip;

  158. 	}

  159. }	

  160. 

  161. void sample_move_dither_rect_d32u24_sSs (char *dst, jack_default_audio_sample_t *src, unsigned long nsamples, unsigned long dst_skip, dither_state_t *state)

  162. {

  163. 	/* ALERT: signed sign-extension portability !!! */

  164. 	jack_default_audio_sample_t  x;

  165. 	long long y;

  166. 	int z;

  167. 

  168. 	while (nsamples--) {

  169. 		x = *src * SAMPLE_MAX_16BIT;

  170. 		x -= (float)fast_rand() / (float)INT_MAX;

  171. 		y = (long long)f_round(x);

  172. 		y <<= 16;

  173. 		if (y > INT_MAX) {

  174. 			z = INT_MAX;

  175. 		} else if (y < INT_MIN) {

  176. 			z = INT_MIN;

  177. 		} else {

  178. 			z = (int)y;

  179. 		}

  180. #if __BYTE_ORDER == __LITTLE_ENDIAN

  181. 		dst[0]=(char)(z>>24);

  182. 		dst[1]=(char)(z>>16);

  183. 		dst[2]=(char)(z>>8);

  184. 		dst[3]=(char)(z);

  185. #elif __BYTE_ORDER == __BIG_ENDIAN

  186. 		dst[0]=(char)(z);

  187. 		dst[1]=(char)(z>>8);

  188. 		dst[2]=(char)(z>>16);

  189. 		dst[3]=(char)(z>>24);

  190. #endif

  191. 		dst += dst_skip;

  192. 		src++;

  193. 	}

  194. }	

  195. 

  196. void sample_move_dither_rect_d32u24_sS (char *dst, jack_default_audio_sample_t *src, unsigned long nsamples, unsigned long dst_skip, dither_state_t *state)

  197. {

  198. 	/* ALERT: signed sign-extension portability !!! */

  199. 	jack_default_audio_sample_t  x;

  200. 	long long y;

  201. 

  202. 	while (nsamples--) {

  203. 		x = *src * SAMPLE_MAX_16BIT;

  204. 		x -= (float)fast_rand() / (float)INT_MAX;

  205. 		y = (long long)f_round(x);

  206. 		y <<= 16;

  207. 		if (y > INT_MAX) {

  208. 			*((int *) dst) = INT_MAX;

  209. 		} else if (y < INT_MIN) {

  210. 			*((int *) dst) = INT_MIN;

  211. 		} else {

  212. 			*((int *) dst) = (int)y;

  213. 		}

  214. 		dst += dst_skip;

  215. 		src++;

  216. 	}

  217. }	

  218. 

  219. void sample_move_dither_tri_d32u24_sSs (char *dst,  jack_default_audio_sample_t *src, unsigned long nsamples, unsigned long dst_skip, dither_state_t *state)	

  220. {

  221. 	jack_default_audio_sample_t  x;

  222. 	float     r;

  223. 	float     rm1 = state->rm1;

  224. 	long long y;

  225. 	int z;

  226. 

  227. 	while (nsamples--) {

  228. 		x = *src * (float)SAMPLE_MAX_16BIT;

  229. 		r = 2.0f * (float)fast_rand() / (float)INT_MAX - 1.0f;

  230. 		x += r - rm1;

  231. 		rm1 = r;

  232. 		y = (long long)f_round(x);

  233. 		y <<= 16;

  234. 

  235. 		if (y > INT_MAX) {

  236. 			z = INT_MAX;

  237. 		} else if (y < INT_MIN) {

  238. 			z = INT_MIN;

  239. 		} else {

  240. 			z = (int)y;

  241. 		}

  242. #if __BYTE_ORDER == __LITTLE_ENDIAN

  243. 		dst[0]=(char)(z>>24);

  244. 		dst[1]=(char)(z>>16);

  245. 		dst[2]=(char)(z>>8);

  246. 		dst[3]=(char)(z);

  247. #elif __BYTE_ORDER == __BIG_ENDIAN

  248. 		dst[0]=(char)(z);

  249. 		dst[1]=(char)(z>>8);

  250. 		dst[2]=(char)(z>>16);

  251. 		dst[3]=(char)(z>>24);

  252. #endif

  253. 		dst += dst_skip;

  254. 		src++;

  255. 	}

  256. 	state->rm1 = rm1;

  257. }

  258. 

  259. void sample_move_dither_tri_d32u24_sS (char *dst,  jack_default_audio_sample_t *src, unsigned long nsamples, unsigned long dst_skip, dither_state_t *state)	

  260. {

  261. 	jack_default_audio_sample_t  x;

  262. 	float     r;

  263. 	float     rm1 = state->rm1;

  264. 	long long y;

  265. 

  266. 	while (nsamples--) {

  267. 		x = *src * (float)SAMPLE_MAX_16BIT;

  268. 		r = 2.0f * (float)fast_rand() / (float)INT_MAX - 1.0f;

  269. 		x += r - rm1;

  270. 		rm1 = r;

  271. 		y = (long long)f_round(x);

  272. 		y <<= 16;

  273. 

  274. 		if (y > INT_MAX) {

  275. 			*((int *) dst) = INT_MAX;

  276. 		} else if (y < INT_MIN) {

  277. 			*((int *) dst) = INT_MIN;

  278. 		} else {

  279. 			*((int *) dst) = (int)y;

  280. 		}

  281. 

  282. 		dst += dst_skip;

  283. 		src++;

  284. 	}

  285. 	state->rm1 = rm1;

  286. }

  287. 

  288. void sample_move_dither_shaped_d32u24_sSs (char *dst,  jack_default_audio_sample_t *src, unsigned long nsamples, unsigned long dst_skip, dither_state_t *state)	

  289. {

  290. 	jack_default_audio_sample_t     x;

  291. 	jack_default_audio_sample_t     xe; /* the innput sample - filtered error */

  292. 	jack_default_audio_sample_t     xp; /* x' */

  293. 	float        r;

  294. 	float        rm1 = state->rm1;

  295. 	unsigned int idx = state->idx;

  296. 	long long    y;

  297. 	int z;

  298. 

  299. 	while (nsamples--) {

  300. 		x = *src * (float)SAMPLE_MAX_16BIT;

  301. 		r = 2.0f * (float)fast_rand() / (float)INT_MAX - 1.0f;

  302. 		/* Filter the error with Lipshitz's minimally audible FIR:

  303. 		   [2.033 -2.165 1.959 -1.590 0.6149] */

  304. 		xe = x

  305. 		     - state->e[idx] * 2.033f

  306. 		     + state->e[(idx - 1) & DITHER_BUF_MASK] * 2.165f

  307. 		     - state->e[(idx - 2) & DITHER_BUF_MASK] * 1.959f

  308. 		     + state->e[(idx - 3) & DITHER_BUF_MASK] * 1.590f

  309. 		     - state->e[(idx - 4) & DITHER_BUF_MASK] * 0.6149f;

  310. 		xp = xe + r - rm1;

  311. 		rm1 = r;

  312. 

  313. 		/* This could be some inline asm on x86 */

  314. 		y = (long long)f_round(xp);

  315. 

  316. 		/* Intrinsic z^-1 delay */

  317. 		idx = (idx + 1) & DITHER_BUF_MASK;

  318. 		state->e[idx] = y - xe;

  319. 

  320. 		y <<= 16;

  321. 

  322. 		if (y > INT_MAX) {

  323. 			z = INT_MAX;

  324. 		} else if (y < INT_MIN) {

  325. 			z = INT_MIN;

  326. 		} else {

  327. 			z = (int)y;

  328. 		}

  329. #if __BYTE_ORDER == __LITTLE_ENDIAN

  330. 		dst[0]=(char)(z>>24);

  331. 		dst[1]=(char)(z>>16);

  332. 		dst[2]=(char)(z>>8);

  333. 		dst[3]=(char)(z);

  334. #elif __BYTE_ORDER == __BIG_ENDIAN

  335. 		dst[0]=(char)(z);

  336. 		dst[1]=(char)(z>>8);

  337. 		dst[2]=(char)(z>>16);

  338. 		dst[3]=(char)(z>>24);

  339. #endif

  340. 		dst += dst_skip;

  341. 		src++;

  342. 	}

  343. 	state->rm1 = rm1;

  344. 	state->idx = idx;

  345. }

  346. 

  347. void sample_move_dither_shaped_d32u24_sS (char *dst,  jack_default_audio_sample_t *src, unsigned long nsamples, unsigned long dst_skip, dither_state_t *state)	

  348. {

  349. 	jack_default_audio_sample_t     x;

  350. 	jack_default_audio_sample_t     xe; /* the innput sample - filtered error */

  351. 	jack_default_audio_sample_t     xp; /* x' */

  352. 	float        r;

  353. 	float        rm1 = state->rm1;

  354. 	unsigned int idx = state->idx;

  355. 	long long    y;

  356. 

  357. 	while (nsamples--) {

  358. 		x = *src * (float)SAMPLE_MAX_16BIT;

  359. 		r = 2.0f * (float)fast_rand() / (float)INT_MAX - 1.0f;

  360. 		/* Filter the error with Lipshitz's minimally audible FIR:

  361. 		   [2.033 -2.165 1.959 -1.590 0.6149] */

  362. 		xe = x

  363. 		     - state->e[idx] * 2.033f

  364. 		     + state->e[(idx - 1) & DITHER_BUF_MASK] * 2.165f

  365. 		     - state->e[(idx - 2) & DITHER_BUF_MASK] * 1.959f

  366. 		     + state->e[(idx - 3) & DITHER_BUF_MASK] * 1.590f

  367. 		     - state->e[(idx - 4) & DITHER_BUF_MASK] * 0.6149f;

  368. 		xp = xe + r - rm1;

  369. 		rm1 = r;

  370. 

  371. 		/* This could be some inline asm on x86 */

  372. 		y = (long long)f_round(xp);

  373. 

  374. 		/* Intrinsic z^-1 delay */

  375. 		idx = (idx + 1) & DITHER_BUF_MASK;

  376. 		state->e[idx] = y - xe;

  377. 

  378. 		y <<= 16;

  379. 

  380. 		if (y > INT_MAX) {

  381. 			*((int *) dst) = INT_MAX;

  382. 		} else if (y < INT_MIN) {

  383. 			*((int *) dst) = INT_MIN;

  384. 		} else {

  385. 			*((int *) dst) = y;

  386. 		}

  387. 		dst += dst_skip;

  388. 		src++;

  389. 	}

  390. 	state->rm1 = rm1;

  391. 	state->idx = idx;

  392. }

  393. 

  394. void sample_move_d24_sSs (char *dst, jack_default_audio_sample_t *src, unsigned long nsamples, unsigned long dst_skip, dither_state_t *state)

  395. {

  396.         long long y;

  397. 	int z;

  398. 

  399. 	while (nsamples--) {

  400. 		y = (long long)(*src * SAMPLE_MAX_24BIT);

  401. 

  402. 		if (y > (INT_MAX >> 8 )) {

  403. 			z = (INT_MAX >> 8);

  404. 		} else if (y < (INT_MIN >> 8 )) {

  405. 			z = (INT_MIN >> 8 );

  406. 		} else {

  407. 			z = (int)y;

  408. 		}

  409. #if __BYTE_ORDER == __LITTLE_ENDIAN

  410. 		dst[0]=(char)(z>>16);

  411. 		dst[1]=(char)(z>>8);

  412. 		dst[2]=(char)(z);

  413. #elif __BYTE_ORDER == __BIG_ENDIAN

  414. 		dst[0]=(char)(z);

  415. 		dst[1]=(char)(z>>8);

  416. 		dst[2]=(char)(z>>16);

  417. #endif

  418. 		dst += dst_skip;

  419. 		src++;

  420. 	}

  421. }	

  422. 

  423. void sample_move_d24_sS (char *dst, jack_default_audio_sample_t *src, unsigned long nsamples, unsigned long dst_skip, dither_state_t *state)

  424. {

  425.         long long y;

  426. 

  427. 	while (nsamples--) {

  428. 		y = (long long)(*src * SAMPLE_MAX_24BIT);

  429. 

  430. 		if (y > (INT_MAX >> 8 )) {

  431. 			y = (INT_MAX >> 8);

  432. 		} else if (y < (INT_MIN >> 8 )) {

  433. 			y = (INT_MIN >> 8 );

  434. 		}

  435. #if __BYTE_ORDER == __LITTLE_ENDIAN

  436. 		memcpy (dst, &y, 3);

  437. #elif __BYTE_ORDER == __BIG_ENDIAN

  438. 		memcpy (dst, (char *)&y + 5, 3);

  439. #endif

  440. 		dst += dst_skip;

  441. 		src++;

  442. 	}

  443. }	

  444. 

  445. void sample_move_dS_s24s (jack_default_audio_sample_t *dst, char *src, unsigned long nsamples, unsigned long src_skip)

  446. {

  447. 	/* ALERT: signed sign-extension portability !!! */

  448. 

  449. 	while (nsamples--) {

  450. 		int x;

  451. #if __BYTE_ORDER == __LITTLE_ENDIAN

  452. 		x = (unsigned char)(src[0]);

  453. 		x <<= 8;

  454. 		x |= (unsigned char)(src[1]);

  455. 		x <<= 8;

  456. 		x |= (unsigned char)(src[2]);

  457. 		/* correct sign bit and the rest of the top byte */

  458. 		if (src[0] & 0x80) {

  459. 			x |= 0xff << 24;

  460. 		}

  461. #elif __BYTE_ORDER == __BIG_ENDIAN

  462. 		x = (unsigned char)(src[2]);

  463. 		x <<= 8;

  464. 		x |= (unsigned char)(src[1]);

  465. 		x <<= 8;

  466. 		x |= (unsigned char)(src[0]);

  467. 		/* correct sign bit and the rest of the top byte */

  468. 		if (src[0] & 0x80) {

  469. 			x |= 0xff << 24;

  470. 		}

  471. #endif

  472. 		*dst = x / SAMPLE_MAX_24BIT;

  473. 		dst++;

  474. 		src += src_skip;

  475. 	}

  476. }	

  477. 

  478. void sample_move_dS_s24 (jack_default_audio_sample_t *dst, char *src, unsigned long nsamples, unsigned long src_skip)

  479. {

  480. 	/* ALERT: signed sign-extension portability !!! */

  481. 

  482. 	while (nsamples--) {

  483. 		int x;

  484. #if __BYTE_ORDER == __LITTLE_ENDIAN

  485. 		memcpy((char*)&x + 1, src, 3);

  486. #elif __BYTE_ORDER == __BIG_ENDIAN

  487. 		memcpy(&x, src, 3);

  488. #endif

  489. 		x >>= 8;

  490. 		*dst = x / SAMPLE_MAX_24BIT;

  491. 		dst++;

  492. 		src += src_skip;

  493. 	}

  494. }	

  495. 

  496. void sample_move_dither_rect_d24_sSs (char *dst, jack_default_audio_sample_t *src, unsigned long nsamples, unsigned long dst_skip, dither_state_t *state)

  497. {

  498. 	/* ALERT: signed sign-extension portability !!! */

  499. 	jack_default_audio_sample_t  x;

  500. 	long long y;

  501. 	int z;

  502. 

  503. 	while (nsamples--) {

  504. 		x = *src * SAMPLE_MAX_16BIT;

  505. 		x -= (float)fast_rand() / (float)INT_MAX;

  506. 		y = (long long)f_round(x);

  507. 

  508. 		y <<= 8;

  509. 

  510. 		if (y > (INT_MAX >> 8)) {

  511. 			z = (INT_MAX >> 8);

  512. 		} else if (y < (INT_MIN >> 8)) {

  513. 			z = (INT_MIN >> 8);

  514. 		} else {

  515. 			z = (int)y;

  516. 		}

  517. #if __BYTE_ORDER == __LITTLE_ENDIAN

  518. 		dst[0]=(char)(z>>16);

  519. 		dst[1]=(char)(z>>8);

  520. 		dst[2]=(char)(z);

  521. #elif __BYTE_ORDER == __BIG_ENDIAN

  522. 		dst[0]=(char)(z);

  523. 		dst[1]=(char)(z>>8);

  524. 		dst[2]=(char)(z>>16);

  525. #endif

  526. 		dst += dst_skip;

  527. 		src++;

  528. 	}

  529. }	

  530. 

  531. void sample_move_dither_rect_d24_sS (char *dst, jack_default_audio_sample_t *src, unsigned long nsamples, unsigned long dst_skip, dither_state_t *state)

  532. {

  533. 	/* ALERT: signed sign-extension portability !!! */

  534. 	jack_default_audio_sample_t  x;

  535. 	long long y;

  536. 

  537. 	while (nsamples--) {

  538. 		x = *src * SAMPLE_MAX_16BIT;

  539. 		x -= (float)fast_rand() / (float)INT_MAX;

  540. 		y = (long long)f_round(x);

  541. 

  542. 		y <<= 8;

  543. 

  544. 		if (y > (INT_MAX >> 8)) {

  545. 			y = (INT_MAX >> 8);

  546. 		} else if (y < (INT_MIN >> 8)) {

  547. 			y = (INT_MIN >> 8);

  548. 		}

  549. #if __BYTE_ORDER == __LITTLE_ENDIAN

  550. 		memcpy (dst, &y, 3);

  551. #elif __BYTE_ORDER == __BIG_ENDIAN

  552. 		memcpy (dst, (char *)&y + 5, 3);

  553. #endif

  554. 

  555. 		dst += dst_skip;

  556. 		src++;

  557. 	}

  558. }	

  559. 

  560. void sample_move_dither_tri_d24_sSs (char *dst,  jack_default_audio_sample_t *src, unsigned long nsamples, unsigned long dst_skip, dither_state_t *state)	

  561. {

  562. 	jack_default_audio_sample_t  x;

  563. 	float     r;

  564. 	float     rm1 = state->rm1;

  565. 	long long y;

  566. 	int z;

  567. 

  568. 	while (nsamples--) {

  569. 		x = *src * (float)SAMPLE_MAX_16BIT;

  570. 		r = 2.0f * (float)fast_rand() / (float)INT_MAX - 1.0f;

  571. 		x += r - rm1;

  572. 		rm1 = r;

  573. 		y = (long long)f_round(x);

  574. 

  575. 		y <<= 8;

  576. 

  577. 		if (y > (INT_MAX >> 8)) {

  578. 			z = (INT_MAX >> 8);

  579. 		} else if (y < (INT_MIN >> 8)) {

  580. 			z = (INT_MIN >> 8);

  581. 		} else {

  582. 			z = (int)y;

  583. 		}

  584. #if __BYTE_ORDER == __LITTLE_ENDIAN

  585. 		dst[0]=(char)(z>>16);

  586. 		dst[1]=(char)(z>>8);

  587. 		dst[2]=(char)(z);

  588. #elif __BYTE_ORDER == __BIG_ENDIAN

  589. 		dst[0]=(char)(z);

  590. 		dst[1]=(char)(z>>8);

  591. 		dst[2]=(char)(z>>16);

  592. #endif

  593. 		dst += dst_skip;

  594. 		src++;

  595. 	}

  596. 	state->rm1 = rm1;

  597. }

  598. 

  599. void sample_move_dither_tri_d24_sS (char *dst,  jack_default_audio_sample_t *src, unsigned long nsamples, unsigned long dst_skip, dither_state_t *state)	

  600. {

  601. 	jack_default_audio_sample_t  x;

  602. 	float     r;

  603. 	float     rm1 = state->rm1;

  604. 	long long y;

  605. 

  606. 	while (nsamples--) {

  607. 		x = *src * (float)SAMPLE_MAX_16BIT;

  608. 		r = 2.0f * (float)fast_rand() / (float)INT_MAX - 1.0f;

  609. 		x += r - rm1;

  610. 		rm1 = r;

  611. 		y = (long long)f_round(x);

  612. 

  613. 		y <<= 8;

  614. 

  615. 		if (y > (INT_MAX >> 8)) {

  616. 			y = (INT_MAX >> 8);

  617. 		} else if (y < (INT_MIN >> 8)) {

  618. 			y = (INT_MIN >> 8);

  619. 		}

  620. #if __BYTE_ORDER == __LITTLE_ENDIAN

  621. 		memcpy (dst, &y, 3);

  622. #elif __BYTE_ORDER == __BIG_ENDIAN

  623. 		memcpy (dst, (char *)&y + 5, 3);

  624. #endif

  625. 

  626. 		dst += dst_skip;

  627. 		src++;

  628. 	}

  629. 	state->rm1 = rm1;

  630. }

  631. 

  632. void sample_move_dither_shaped_d24_sSs (char *dst,  jack_default_audio_sample_t *src, unsigned long nsamples, unsigned long dst_skip, dither_state_t *state)	

  633. {

  634. 	jack_default_audio_sample_t     x;

  635. 	jack_default_audio_sample_t     xe; /* the innput sample - filtered error */

  636. 	jack_default_audio_sample_t     xp; /* x' */

  637. 	float        r;

  638. 	float        rm1 = state->rm1;

  639. 	unsigned int idx = state->idx;

  640. 	long long    y;

  641. 	int z;

  642. 

  643. 	while (nsamples--) {

  644. 		x = *src * (float)SAMPLE_MAX_16BIT;

  645. 		r = 2.0f * (float)fast_rand() / (float)INT_MAX - 1.0f;

  646. 		/* Filter the error with Lipshitz's minimally audible FIR:

  647. 		   [2.033 -2.165 1.959 -1.590 0.6149] */

  648. 		xe = x

  649. 		     - state->e[idx] * 2.033f

  650. 		     + state->e[(idx - 1) & DITHER_BUF_MASK] * 2.165f

  651. 		     - state->e[(idx - 2) & DITHER_BUF_MASK] * 1.959f

  652. 		     + state->e[(idx - 3) & DITHER_BUF_MASK] * 1.590f

  653. 		     - state->e[(idx - 4) & DITHER_BUF_MASK] * 0.6149f;

  654. 		xp = xe + r - rm1;

  655. 		rm1 = r;

  656. 

  657. 		/* This could be some inline asm on x86 */

  658. 		y = (long long)f_round(xp);

  659. 

  660. 		/* Intrinsic z^-1 delay */

  661. 		idx = (idx + 1) & DITHER_BUF_MASK;

  662. 		state->e[idx] = y - xe;

  663. 

  664. 		y <<= 8;

  665. 

  666. 		if (y > (INT_MAX >> 8)) {

  667. 			z = (INT_MAX >> 8);

  668. 		} else if (y < (INT_MIN >> 8)) {

  669. 			z = (INT_MIN >> 8);

  670. 		} else {

  671. 			z = (int)y;

  672. 		}

  673. #if __BYTE_ORDER == __LITTLE_ENDIAN

  674. 		dst[0]=(char)(z>>16);

  675. 		dst[1]=(char)(z>>8);

  676. 		dst[2]=(char)(z);

  677. #elif __BYTE_ORDER == __BIG_ENDIAN

  678. 		dst[0]=(char)(z);

  679. 		dst[1]=(char)(z>>8);

  680. 		dst[2]=(char)(z>>16);

  681. #endif

  682. 		dst += dst_skip;

  683. 		src++;

  684. 	}

  685. 	state->rm1 = rm1;

  686. 	state->idx = idx;

  687. }

  688. 

  689. void sample_move_dither_shaped_d24_sS (char *dst,  jack_default_audio_sample_t *src, unsigned long nsamples, unsigned long dst_skip, dither_state_t *state)	

  690. {

  691. 	jack_default_audio_sample_t     x;

  692. 	jack_default_audio_sample_t     xe; /* the innput sample - filtered error */

  693. 	jack_default_audio_sample_t     xp; /* x' */

  694. 	float        r;

  695. 	float        rm1 = state->rm1;

  696. 	unsigned int idx = state->idx;

  697. 	long long    y;

  698. 

  699. 	while (nsamples--) {

  700. 		x = *src * (float)SAMPLE_MAX_16BIT;

  701. 		r = 2.0f * (float)fast_rand() / (float)INT_MAX - 1.0f;

  702. 		/* Filter the error with Lipshitz's minimally audible FIR:

  703. 		   [2.033 -2.165 1.959 -1.590 0.6149] */

  704. 		xe = x

  705. 		     - state->e[idx] * 2.033f

  706. 		     + state->e[(idx - 1) & DITHER_BUF_MASK] * 2.165f

  707. 		     - state->e[(idx - 2) & DITHER_BUF_MASK] * 1.959f

  708. 		     + state->e[(idx - 3) & DITHER_BUF_MASK] * 1.590f

  709. 		     - state->e[(idx - 4) & DITHER_BUF_MASK] * 0.6149f;

  710. 		xp = xe + r - rm1;

  711. 		rm1 = r;

  712. 

  713. 		/* This could be some inline asm on x86 */

  714. 		y = (long long)f_round(xp);

  715. 

  716. 		/* Intrinsic z^-1 delay */

  717. 		idx = (idx + 1) & DITHER_BUF_MASK;

  718. 		state->e[idx] = y - xe;

  719. 

  720. 		y <<= 8;

  721. 

  722. 		if (y > (INT_MAX >> 8)) {

  723. 			y = (INT_MAX >> 8);

  724. 		} else if (y < (INT_MIN >> 8)) {

  725. 			y = (INT_MIN >> 8);

  726. 		}

  727. #if __BYTE_ORDER == __LITTLE_ENDIAN

  728. 		memcpy (dst, &y, 3);

  729. #elif __BYTE_ORDER == __BIG_ENDIAN

  730. 		memcpy (dst, (char *)&y + 5, 3);

  731. #endif

  732. 

  733. 		dst += dst_skip;

  734. 		src++;

  735. 	}

  736. 	state->rm1 = rm1;

  737. 	state->idx = idx;

  738. }

  739. 

  740. void sample_move_d16_sSs (char *dst,  jack_default_audio_sample_t *src, unsigned long nsamples, unsigned long dst_skip, dither_state_t *state)	

  741. {

  742. 	int tmp;

  743. 

  744. 	/* ALERT: signed sign-extension portability !!! */

  745. 

  746. 	while (nsamples--) {

  747. 		tmp = f_round(*src * SAMPLE_MAX_16BIT);

  748. 		if (tmp > SHRT_MAX) {

  749. 			tmp = SHRT_MAX;

  750. 		} else if (tmp < SHRT_MIN) {

  751. 			tmp = SHRT_MIN;

  752. 		}

  753. #if __BYTE_ORDER == __LITTLE_ENDIAN

  754. 		dst[0]=(char)(tmp>>8);

  755. 		dst[1]=(char)(tmp);

  756. #elif __BYTE_ORDER == __BIG_ENDIAN

  757. 		dst[0]=(char)(tmp);

  758. 		dst[1]=(char)(tmp>>8);

  759. #endif

  760. 		dst += dst_skip;

  761. 		src++;

  762. 	}

  763. }

  764. 

  765. void sample_move_d16_sS (char *dst,  jack_default_audio_sample_t *src, unsigned long nsamples, unsigned long dst_skip, dither_state_t *state)	

  766. {

  767. 	int tmp;

  768. 

  769. 	/* ALERT: signed sign-extension portability !!! */

  770. 

  771. 	while (nsamples--) {

  772. 		tmp = f_round(*src * SAMPLE_MAX_16BIT);

  773. 		if (tmp > SHRT_MAX) {

  774. 			*((short *)dst) = SHRT_MAX;

  775. 		} else if (tmp < SHRT_MIN) {

  776. 			*((short *)dst) = SHRT_MIN;

  777. 		} else {

  778. 			*((short *) dst) = (short) tmp;

  779. 		}

  780. 		dst += dst_skip;

  781. 		src++;

  782. 	}

  783. }

  784. 

  785. 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)	

  786. {

  787. 	jack_default_audio_sample_t val;

  788. 	int      tmp;

  789. 

  790. 	while (nsamples--) {

  791. 		val = *src * (float)SAMPLE_MAX_16BIT;

  792. 		val -= (float)fast_rand() / (float)INT_MAX;

  793. 		tmp = f_round(val);

  794. 		if (tmp > SHRT_MAX) {

  795. 			tmp = SHRT_MAX;

  796. 		} else if (tmp < SHRT_MIN) {

  797. 			tmp = SHRT_MIN;

  798. 		}

  799. #if __BYTE_ORDER == __LITTLE_ENDIAN

  800. 		dst[0]=(char)(tmp>>8);

  801. 		dst[1]=(char)(tmp);

  802. #elif __BYTE_ORDER == __BIG_ENDIAN

  803. 		dst[0]=(char)(tmp);

  804. 		dst[1]=(char)(tmp>>8);

  805. #endif

  806. 		dst += dst_skip;

  807. 		src++;

  808. 	}

  809. }

  810. 

  811. 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)	

  812. {

  813. 	jack_default_audio_sample_t val;

  814. 	int      tmp;

  815. 

  816. 	while (nsamples--) {

  817. 		val = *src * (float)SAMPLE_MAX_16BIT;

  818. 		val -= (float)fast_rand() / (float)INT_MAX;

  819. 		tmp = f_round(val);

  820. 		if (tmp > SHRT_MAX) {

  821. 			*((short *)dst) = SHRT_MAX;

  822. 		} else if (tmp < SHRT_MIN) {

  823. 			*((short *)dst) = SHRT_MIN;

  824. 		} else {

  825. 			*((short *) dst) = (short)tmp;

  826. 		}

  827. 		dst += dst_skip;

  828. 		src++;

  829. 	}

  830. }

  831. 

  832. 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)	

  833. {

  834. 	jack_default_audio_sample_t x;

  835. 	float    r;

  836. 	float    rm1 = state->rm1;

  837. 	int      y;

  838. 

  839. 	while (nsamples--) {

  840. 		x = *src * (float)SAMPLE_MAX_16BIT;

  841. 		r = 2.0f * (float)fast_rand() / (float)INT_MAX - 1.0f;

  842. 		x += r - rm1;

  843. 		rm1 = r;

  844. 		y = f_round(x);

  845. 

  846. 		if (y > SHRT_MAX) {

  847. 			y = SHRT_MAX;

  848. 		} else if (y < SHRT_MIN) {

  849. 			y = SHRT_MIN;

  850. 		}

  851. #if __BYTE_ORDER == __LITTLE_ENDIAN

  852. 		dst[0]=(char)(y>>8);

  853. 		dst[1]=(char)(y);

  854. #elif __BYTE_ORDER == __BIG_ENDIAN

  855. 		dst[0]=(char)(y);

  856. 		dst[1]=(char)(y>>8);

  857. #endif

  858. 		dst += dst_skip;

  859. 		src++;

  860. 	}

  861. 	state->rm1 = rm1;

  862. }

  863. 

  864. 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)	

  865. {

  866. 	jack_default_audio_sample_t x;

  867. 	float    r;

  868. 	float    rm1 = state->rm1;

  869. 	int      y;

  870. 

  871. 	while (nsamples--) {

  872. 		x = *src * (float)SAMPLE_MAX_16BIT;

  873. 		r = 2.0f * (float)fast_rand() / (float)INT_MAX - 1.0f;

  874. 		x += r - rm1;

  875. 		rm1 = r;

  876. 		y = f_round(x);

  877. 

  878. 		if (y > SHRT_MAX) {

  879. 			*((short *)dst) = SHRT_MAX;

  880. 		} else if (y < SHRT_MIN) {

  881. 			*((short *)dst) = SHRT_MIN;

  882. 		} else {

  883. 			*((short *) dst) = (short)y;

  884. 		}

  885. 

  886. 		dst += dst_skip;

  887. 		src++;

  888. 	}

  889. 	state->rm1 = rm1;

  890. }

  891. 

  892. 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)	

  893. {

  894. 	jack_default_audio_sample_t     x;

  895. 	jack_default_audio_sample_t     xe; /* the innput sample - filtered error */

  896. 	jack_default_audio_sample_t     xp; /* x' */

  897. 	float        r;

  898. 	float        rm1 = state->rm1;

  899. 	unsigned int idx = state->idx;

  900. 	int          y;

  901. 

  902. 	while (nsamples--) {

  903. 		x = *src * (float)SAMPLE_MAX_16BIT;

  904. 		r = 2.0f * (float)fast_rand() / (float)INT_MAX - 1.0f;

  905. 		/* Filter the error with Lipshitz's minimally audible FIR:

  906. 		   [2.033 -2.165 1.959 -1.590 0.6149] */

  907. 		xe = x

  908. 		     - state->e[idx] * 2.033f

  909. 		     + state->e[(idx - 1) & DITHER_BUF_MASK] * 2.165f

  910. 		     - state->e[(idx - 2) & DITHER_BUF_MASK] * 1.959f

  911. 		     + state->e[(idx - 3) & DITHER_BUF_MASK] * 1.590f

  912. 		     - state->e[(idx - 4) & DITHER_BUF_MASK] * 0.6149f;

  913. 		xp = xe + r - rm1;

  914. 		rm1 = r;

  915. 

  916. 		/* This could be some inline asm on x86 */

  917. 		y = f_round(xp);

  918. 

  919. 		/* Intrinsic z^-1 delay */

  920. 		idx = (idx + 1) & DITHER_BUF_MASK;

  921. 		state->e[idx] = y - xe;

  922. 

  923. 		if (y > SHRT_MAX) {

  924. 			y = SHRT_MAX;

  925. 		} else if (y < SHRT_MIN) {

  926. 			y = SHRT_MIN;

  927. 		}

  928. #if __BYTE_ORDER == __LITTLE_ENDIAN

  929. 		dst[0]=(char)(y>>8);

  930. 		dst[1]=(char)(y);

  931. #elif __BYTE_ORDER == __BIG_ENDIAN

  932. 		dst[0]=(char)(y);

  933. 		dst[1]=(char)(y>>8);

  934. #endif

  935. 		dst += dst_skip;

  936. 		src++;

  937. 	}

  938. 	state->rm1 = rm1;

  939. 	state->idx = idx;

  940. }

  941. 

  942. 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)	

  943. {

  944. 	jack_default_audio_sample_t     x;

  945. 	jack_default_audio_sample_t     xe; /* the innput sample - filtered error */

  946. 	jack_default_audio_sample_t     xp; /* x' */

  947. 	float        r;

  948. 	float        rm1 = state->rm1;

  949. 	unsigned int idx = state->idx;

  950. 	int          y;

  951. 

  952. 	while (nsamples--) {

  953. 		x = *src * (float)SAMPLE_MAX_16BIT;

  954. 		r = 2.0f * (float)fast_rand() / (float)INT_MAX - 1.0f;

  955. 		/* Filter the error with Lipshitz's minimally audible FIR:

  956. 		   [2.033 -2.165 1.959 -1.590 0.6149] */

  957. 		xe = x

  958. 		     - state->e[idx] * 2.033f

  959. 		     + state->e[(idx - 1) & DITHER_BUF_MASK] * 2.165f

  960. 		     - state->e[(idx - 2) & DITHER_BUF_MASK] * 1.959f

  961. 		     + state->e[(idx - 3) & DITHER_BUF_MASK] * 1.590f

  962. 		     - state->e[(idx - 4) & DITHER_BUF_MASK] * 0.6149f;

  963. 		xp = xe + r - rm1;

  964. 		rm1 = r;

  965. 

  966. 		/* This could be some inline asm on x86 */

  967. 		y = f_round(xp);

  968. 

  969. 		/* Intrinsic z^-1 delay */

  970. 		idx = (idx + 1) & DITHER_BUF_MASK;

  971. 		state->e[idx] = y - xe;

  972. 

  973. 		if (y > SHRT_MAX) {

  974. 			*((short *)dst) = SHRT_MAX;

  975. 		} else if (y < SHRT_MIN) {

  976. 			*((short *)dst) = SHRT_MIN;

  977. 		} else {

  978. 			*((short *) dst) = (short)y;

  979. 		}

  980. 		dst += dst_skip;

  981. 		src++;

  982. 	}

  983. 	state->rm1 = rm1;

  984. 	state->idx = idx;

  985. }

  986. 

  987. void sample_move_dS_s16s (jack_default_audio_sample_t *dst, char *src, unsigned long nsamples, unsigned long src_skip) 	

  988. {

  989. 	short z;

  990. 

  991. 	/* ALERT: signed sign-extension portability !!! */

  992. 	while (nsamples--) {

  993. #if __BYTE_ORDER == __LITTLE_ENDIAN

  994. 		z = (unsigned char)(src[0]);

  995. 		z <<= 8;

  996. 		z |= (unsigned char)(src[1]);

  997. #elif __BYTE_ORDER == __BIG_ENDIAN

  998. 		z = (unsigned char)(src[1]);

  999. 		z <<= 8;

  1000. 		z |= (unsigned char)(src[0]);

  1001. #endif

  1002. 		*dst = z / SAMPLE_MAX_16BIT;

  1003. 		dst++;

  1004. 		src += src_skip;

  1005. 	}

  1006. }	

  1007. 

  1008. void sample_move_dS_s16 (jack_default_audio_sample_t *dst, char *src, unsigned long nsamples, unsigned long src_skip) 

  1009. 	

  1010. {

  1011. 	/* ALERT: signed sign-extension portability !!! */

  1012. 	while (nsamples--) {

  1013. 		*dst = (*((short *) src)) / SAMPLE_MAX_16BIT;

  1014. 		dst++;

  1015. 		src += src_skip;

  1016. 	}

  1017. }	

  1018. 

  1019. void sample_merge_d16_sS (char *dst,  jack_default_audio_sample_t *src, unsigned long nsamples, unsigned long dst_skip, dither_state_t *state)

  1020. {

  1021. 	short val;

  1022. 

  1023. 	/* ALERT: signed sign-extension portability !!! */

  1024. 	

  1025. 	while (nsamples--) {

  1026. 		val = (short) (*src * SAMPLE_MAX_16BIT);

  1027. 		

  1028. 		if (val > SHRT_MAX - *((short *) dst)) {

  1029. 			*((short *)dst) = SHRT_MAX;

  1030. 		} else if (val < SHRT_MIN - *((short *) dst)) {

  1031. 			*((short *)dst) = SHRT_MIN;

  1032. 		} else {

  1033. 			*((short *) dst) += val;

  1034. 		}

  1035. 		dst += dst_skip;

  1036. 		src++;

  1037. 	}

  1038. }	

  1039. 

  1040. void sample_merge_d32u24_sS (char *dst, jack_default_audio_sample_t *src, unsigned long nsamples, unsigned long dst_skip, dither_state_t *state)

  1041. {

  1042. 	/* ALERT: signed sign-extension portability !!! */

  1043. 

  1044. 	while (nsamples--) {

  1045. 		*((int *) dst) += (((int) (*src * SAMPLE_MAX_24BIT)) << 8);

  1046. 		dst += dst_skip;

  1047. 		src++;

  1048. 	}

  1049. }	

  1050. 

  1051. void memset_interleave (char *dst, char val, unsigned long bytes, 

  1052. 			unsigned long unit_bytes, 

  1053. 			unsigned long skip_bytes) 

  1054. {

  1055. 	switch (unit_bytes) {

  1056. 	case 1:

  1057. 		while (bytes--) {

  1058. 			*dst = val;

  1059. 			dst += skip_bytes;

  1060. 		}

  1061. 		break;

  1062. 	case 2:

  1063. 		while (bytes) {

  1064. 			*((short *) dst) = (short) val;

  1065. 			dst += skip_bytes;

  1066. 			bytes -= 2;

  1067. 		}

  1068. 		break;

  1069. 	case 4:		    

  1070. 		while (bytes) {

  1071. 			*((int *) dst) = (int) val;

  1072. 			dst += skip_bytes;

  1073. 			bytes -= 4;

  1074. 		}

  1075. 		break;

  1076. 	default:

  1077. 		while (bytes) {

  1078. 			memset(dst, val, unit_bytes);

  1079. 			dst += skip_bytes;

  1080. 			bytes -= unit_bytes;

  1081. 		}

  1082. 		break;

  1083. 	}

  1084. }

  1085. 

  1086. /* COPY FUNCTIONS: used to move data from an input channel to an

  1087.    output channel. Note that we assume that the skip distance

  1088.    is the same for both channels. This is completely fine

  1089.    unless the input and output were on different audio interfaces that

  1090.    were interleaved differently. We don't try to handle that.

  1091. */

  1092. 

  1093. void 

  1094. memcpy_fake (char *dst, char *src, unsigned long src_bytes, unsigned long foo, unsigned long bar)

  1095. {

  1096. 	memcpy (dst, src, src_bytes);

  1097. }

  1098. 

  1099. void 

  1100. merge_memcpy_d16_s16 (char *dst, char *src, unsigned long src_bytes,

  1101. 		      unsigned long dst_skip_bytes, unsigned long src_skip_bytes)

  1102. {

  1103. 	while (src_bytes) {

  1104. 		*((short *) dst) += *((short *) src);

  1105. 		dst += 2;

  1106. 		src += 2;

  1107. 		src_bytes -= 2;

  1108. 	}

  1109. }

  1110. 

  1111. void 

  1112. merge_memcpy_d32_s32 (char *dst, char *src, unsigned long src_bytes,

  1113. 		      unsigned long dst_skip_bytes, unsigned long src_skip_bytes)

  1114. 

  1115. {

  1116. 	while (src_bytes) {

  1117. 		*((int *) dst) += *((int *) src);

  1118. 		dst += 4;

  1119. 		src += 4;

  1120. 		src_bytes -= 4;

  1121. 	}

  1122. }

  1123. 

  1124. void 

  1125. merge_memcpy_interleave_d16_s16 (char *dst, char *src, unsigned long src_bytes, 

  1126. 				 unsigned long dst_skip_bytes, unsigned long src_skip_bytes)

  1127. {

  1128. 	while (src_bytes) {

  1129. 		*((short *) dst) += *((short *) src);

  1130. 		dst += dst_skip_bytes;

  1131. 		src += src_skip_bytes;

  1132. 		src_bytes -= 2;

  1133. 	}

  1134. }

  1135. 

  1136. void 

  1137. merge_memcpy_interleave_d32_s32 (char *dst, char *src, unsigned long src_bytes,

  1138. 				 unsigned long dst_skip_bytes, unsigned long src_skip_bytes)

  1139. {

  1140. 	while (src_bytes) {

  1141. 		*((int *) dst) += *((int *) src);

  1142. 		dst += dst_skip_bytes;

  1143. 		src += src_skip_bytes;

  1144. 		src_bytes -= 4;

  1145. 	}

  1146. }

  1147. 

  1148. void 

  1149. merge_memcpy_interleave_d24_s24 (char *dst, char *src, unsigned long src_bytes,

  1150. 				 unsigned long dst_skip_bytes, unsigned long src_skip_bytes)

  1151. {

  1152. 	while (src_bytes) {

  1153. 		int acc = (*(int *)dst & 0xFFFFFF) + (*(int *)src & 0xFFFFFF);

  1154. 		memcpy(dst, &acc, 3);

  1155. 		dst += dst_skip_bytes;

  1156. 		src += src_skip_bytes;

  1157. 		src_bytes -= 3;

  1158. 	}

  1159. }

  1160. 

  1161. void 

  1162. memcpy_interleave_d16_s16 (char *dst, char *src, unsigned long src_bytes,

  1163. 			   unsigned long dst_skip_bytes, unsigned long src_skip_bytes)

  1164. {

  1165. 	while (src_bytes) {

  1166. 		*((short *) dst) = *((short *) src);

  1167. 		dst += dst_skip_bytes;

  1168. 		src += src_skip_bytes;

  1169. 		src_bytes -= 2;

  1170. 	}

  1171. }

  1172. 

  1173. void 

  1174. memcpy_interleave_d24_s24 (char *dst, char *src, unsigned long src_bytes,

  1175. 			   unsigned long dst_skip_bytes, unsigned long src_skip_bytes)

  1176. 

  1177. {

  1178. 	while (src_bytes) {

  1179. 		memcpy(dst, src, 3);

  1180. 		dst += dst_skip_bytes;

  1181. 		src += src_skip_bytes;

  1182. 		src_bytes -= 3;

  1183. 	}

  1184. }

  1185. 

  1186. void 

  1187. memcpy_interleave_d32_s32 (char *dst, char *src, unsigned long src_bytes,

  1188. 			   unsigned long dst_skip_bytes, unsigned long src_skip_bytes)

  1189. 

  1190. {

  1191. 	while (src_bytes) {

  1192. 		*((int *) dst) = *((int *) src);

  1193. 		dst += dst_skip_bytes;

  1194. 		src += src_skip_bytes;

  1195. 		src_bytes -= 4;

  1196. 	}

  1197. }