falkTX
/
FFmpeg
mirror of https://github.com/falkTX/FFmpeg.git
1
0
Fork 0
Code Issues 0 Releases 338 Wiki Activity
You can not select more than 25 topics Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
382 Commits
32 Branches
5.3GB
Tree: 1e98dffb7a
Branches Tags
${ item.name }
Create branch ${ searchTerm }
from '1e98dffb7a'
${ noResults }
FFmpeg/postproc/swscale.c

1127 lines
31KB
Raw Blame History 

  1. 

  2. // Software scaling and colorspace conversion routines for MPlayer

  3. 

  4. // Orginal C implementation by A'rpi/ESP-team <arpi@thot.banki.hu>

  5. // current version mostly by Michael Niedermayer (michaelni@gmx.at)

  6. // the parts written by michael are under GNU GPL

  7. 

  8. /*

  9.   supported Input formats: YV12 (grayscale soon too)

  10.   supported output formats: YV12, BGR15, BGR16, BGR24, BGR32 (grayscale soon too)

  11. */

  12. 

  13. #include <inttypes.h>

  14. #include <string.h>

  15. #include <math.h>

  16. #include <stdio.h>

  17. #include "../config.h"

  18. #include "../mangle.h"

  19. #ifdef HAVE_MALLOC_H

  20. #include <malloc.h>

  21. #endif

  22. #include "swscale.h"

  23. #include "../cpudetect.h"

  24. #include "../libvo/img_format.h"

  25. #undef MOVNTQ

  26. #undef PAVGB

  27. 

  28. //#undef HAVE_MMX2

  29. //#define HAVE_3DNOW

  30. //#undef HAVE_MMX

  31. //#undef ARCH_X86

  32. #define DITHER1XBPP

  33. 

  34. #define RET 0xC3 //near return opcode

  35. 

  36. #ifdef MP_DEBUG

  37. #define ASSERT(x) if(!(x)) { printf("ASSERT " #x " failed\n"); *((int*)0)=0; }

  38. #else

  39. #define ASSERT(x) ;

  40. #endif

  41. 

  42. #ifdef M_PI

  43. #define PI M_PI

  44. #else

  45. #define PI 3.14159265358979323846

  46. #endif

  47. 

  48. extern int verbose; // defined in mplayer.c

  49. /*

  50. NOTES

  51. 

  52. known BUGS with known cause (no bugreports please!, but patches are welcome :) )

  53. horizontal fast_bilinear MMX2 scaler reads 1-7 samples too much (might cause a sig11)

  54. 

  55. Supported output formats BGR15 BGR16 BGR24 BGR32 YV12

  56. BGR15 & BGR16 MMX verions support dithering

  57. Special versions: fast Y 1:1 scaling (no interpolation in y direction)

  58. 

  59. TODO

  60. more intelligent missalignment avoidance for the horizontal scaler

  61. dither in C

  62. change the distance of the u & v buffer

  63. Move static / global vars into a struct so multiple scalers can be used

  64. write special vertical cubic upscale version

  65. Optimize C code (yv12 / minmax)

  66. */

  67. 

  68. #define ABS(a) ((a) > 0 ? (a) : (-(a)))

  69. #define MIN(a,b) ((a) > (b) ? (b) : (a))

  70. #define MAX(a,b) ((a) < (b) ? (b) : (a))

  71. 

  72. #ifdef ARCH_X86

  73. #define CAN_COMPILE_X86_ASM

  74. #endif

  75. 

  76. #ifdef CAN_COMPILE_X86_ASM

  77. static uint64_t __attribute__((aligned(8))) yCoeff=    0x2568256825682568LL;

  78. static uint64_t __attribute__((aligned(8))) vrCoeff=   0x3343334333433343LL;

  79. static uint64_t __attribute__((aligned(8))) ubCoeff=   0x40cf40cf40cf40cfLL;

  80. static uint64_t __attribute__((aligned(8))) vgCoeff=   0xE5E2E5E2E5E2E5E2LL;

  81. static uint64_t __attribute__((aligned(8))) ugCoeff=   0xF36EF36EF36EF36ELL;

  82. static uint64_t __attribute__((aligned(8))) bF8=       0xF8F8F8F8F8F8F8F8LL;

  83. static uint64_t __attribute__((aligned(8))) bFC=       0xFCFCFCFCFCFCFCFCLL;

  84. static uint64_t __attribute__((aligned(8))) w400=      0x0400040004000400LL;

  85. static uint64_t __attribute__((aligned(8))) w80=       0x0080008000800080LL;

  86. static uint64_t __attribute__((aligned(8))) w10=       0x0010001000100010LL;

  87. static uint64_t __attribute__((aligned(8))) w02=       0x0002000200020002LL;

  88. static uint64_t __attribute__((aligned(8))) bm00001111=0x00000000FFFFFFFFLL;

  89. static uint64_t __attribute__((aligned(8))) bm00000111=0x0000000000FFFFFFLL;

  90. static uint64_t __attribute__((aligned(8))) bm11111000=0xFFFFFFFFFF000000LL;

  91. 

  92. static volatile uint64_t __attribute__((aligned(8))) b5Dither;

  93. static volatile uint64_t __attribute__((aligned(8))) g5Dither;

  94. static volatile uint64_t __attribute__((aligned(8))) g6Dither;

  95. static volatile uint64_t __attribute__((aligned(8))) r5Dither;

  96. 

  97. static uint64_t __attribute__((aligned(8))) dither4[2]={

  98. 	0x0103010301030103LL,

  99. 	0x0200020002000200LL,};

  100. 

  101. static uint64_t __attribute__((aligned(8))) dither8[2]={

  102. 	0x0602060206020602LL,

  103. 	0x0004000400040004LL,};

  104. 

  105. static uint64_t __attribute__((aligned(8))) b16Mask=   0x001F001F001F001FLL;

  106. static uint64_t __attribute__((aligned(8))) g16Mask=   0x07E007E007E007E0LL;

  107. static uint64_t __attribute__((aligned(8))) r16Mask=   0xF800F800F800F800LL;

  108. static uint64_t __attribute__((aligned(8))) b15Mask=   0x001F001F001F001FLL;

  109. static uint64_t __attribute__((aligned(8))) g15Mask=   0x03E003E003E003E0LL;

  110. static uint64_t __attribute__((aligned(8))) r15Mask=   0x7C007C007C007C00LL;

  111. 

  112. static uint64_t __attribute__((aligned(8))) M24A=   0x00FF0000FF0000FFLL;

  113. static uint64_t __attribute__((aligned(8))) M24B=   0xFF0000FF0000FF00LL;

  114. static uint64_t __attribute__((aligned(8))) M24C=   0x0000FF0000FF0000LL;

  115. 

  116. // FIXME remove

  117. static uint64_t __attribute__((aligned(8))) asm_yalpha1;

  118. static uint64_t __attribute__((aligned(8))) asm_uvalpha1;

  119. #endif

  120. 

  121. // clipping helper table for C implementations:

  122. static unsigned char clip_table[768];

  123. 

  124. static unsigned short clip_table16b[768];

  125. static unsigned short clip_table16g[768];

  126. static unsigned short clip_table16r[768];

  127. static unsigned short clip_table15b[768];

  128. static unsigned short clip_table15g[768];

  129. static unsigned short clip_table15r[768];

  130. 

  131. // yuv->rgb conversion tables:

  132. static    int yuvtab_2568[256];

  133. static    int yuvtab_3343[256];

  134. static    int yuvtab_0c92[256];

  135. static    int yuvtab_1a1e[256];

  136. static    int yuvtab_40cf[256];

  137. // Needed for cubic scaler to catch overflows

  138. static    int clip_yuvtab_2568[768];

  139. static    int clip_yuvtab_3343[768];

  140. static    int clip_yuvtab_0c92[768];

  141. static    int clip_yuvtab_1a1e[768];

  142. static    int clip_yuvtab_40cf[768];

  143. 

  144. //global sws_flags from the command line

  145. int sws_flags=0;

  146. 

  147. /* cpuCaps combined from cpudetect and whats actually compiled in

  148.    (if there is no support for something compiled in it wont appear here) */

  149. static CpuCaps cpuCaps;

  150. 

  151. void (*swScale)(SwsContext *context, uint8_t* src[], int srcStride[], int srcSliceY,

  152.              int srcSliceH, uint8_t* dst[], int dstStride[])=NULL;

  153. 

  154. #ifdef CAN_COMPILE_X86_ASM

  155. void in_asm_used_var_warning_killer()

  156. {

  157.  volatile int i= yCoeff+vrCoeff+ubCoeff+vgCoeff+ugCoeff+bF8+bFC+w400+w80+w10+

  158.  bm00001111+bm00000111+bm11111000+b16Mask+g16Mask+r16Mask+b15Mask+g15Mask+r15Mask+asm_yalpha1+ asm_uvalpha1+

  159.  M24A+M24B+M24C+w02 + b5Dither+g5Dither+r5Dither+g6Dither+dither4[0]+dither8[0];

  160.  if(i) i=0;

  161. }

  162. #endif

  163. 

  164. static inline void yuv2yuvXinC(int16_t *lumFilter, int16_t **lumSrc, int lumFilterSize,

  165. 				    int16_t *chrFilter, int16_t **chrSrc, int chrFilterSize,

  166. 				    uint8_t *dest, uint8_t *uDest, uint8_t *vDest, int dstW)

  167. {

  168. 	//FIXME Optimize (just quickly writen not opti..)

  169. 	int i;

  170. 	for(i=0; i<dstW; i++)

  171. 	{

  172. 		int val=0;

  173. 		int j;

  174. 		for(j=0; j<lumFilterSize; j++)

  175. 			val += lumSrc[j][i] * lumFilter[j];

  176. 

  177. 		dest[i]= MIN(MAX(val>>19, 0), 255);

  178. 	}

  179. 

  180. 	if(uDest != NULL)

  181. 		for(i=0; i<(dstW>>1); i++)

  182. 		{

  183. 			int u=0;

  184. 			int v=0;

  185. 			int j;

  186. 			for(j=0; j<chrFilterSize; j++)

  187. 			{

  188. 				u += chrSrc[j][i] * chrFilter[j];

  189. 				v += chrSrc[j][i + 2048] * chrFilter[j];

  190. 			}

  191. 

  192. 			uDest[i]= MIN(MAX(u>>19, 0), 255);

  193. 			vDest[i]= MIN(MAX(v>>19, 0), 255);

  194. 		}

  195. }

  196. 

  197. static inline void yuv2rgbXinC(int16_t *lumFilter, int16_t **lumSrc, int lumFilterSize,

  198. 				    int16_t *chrFilter, int16_t **chrSrc, int chrFilterSize,

  199. 				    uint8_t *dest, int dstW, int dstFormat)

  200. {

  201. 	if(dstFormat==IMGFMT_BGR32)

  202. 	{

  203. 		int i;

  204. 		for(i=0; i<(dstW>>1); i++){

  205. 			int j;

  206. 			int Y1=0;

  207. 			int Y2=0;

  208. 			int U=0;

  209. 			int V=0;

  210. 			int Cb, Cr, Cg;

  211. 			for(j=0; j<lumFilterSize; j++)

  212. 			{

  213. 				Y1 += lumSrc[j][2*i] * lumFilter[j];

  214. 				Y2 += lumSrc[j][2*i+1] * lumFilter[j];

  215. 			}

  216. 			for(j=0; j<chrFilterSize; j++)

  217. 			{

  218. 				U += chrSrc[j][i] * chrFilter[j];

  219. 				V += chrSrc[j][i+2048] * chrFilter[j];

  220. 			}

  221. 			Y1= clip_yuvtab_2568[ (Y1>>19) + 256 ];

  222. 			Y2= clip_yuvtab_2568[ (Y2>>19) + 256 ];

  223. 			U >>= 19;

  224. 			V >>= 19;

  225. 

  226. 			Cb= clip_yuvtab_40cf[U+ 256];

  227. 			Cg= clip_yuvtab_1a1e[V+ 256] + yuvtab_0c92[U+ 256];

  228. 			Cr= clip_yuvtab_3343[V+ 256];

  229. 

  230. 			dest[8*i+0]=clip_table[((Y1 + Cb) >>13)];

  231. 			dest[8*i+1]=clip_table[((Y1 + Cg) >>13)];

  232. 			dest[8*i+2]=clip_table[((Y1 + Cr) >>13)];

  233. 

  234. 			dest[8*i+4]=clip_table[((Y2 + Cb) >>13)];

  235. 			dest[8*i+5]=clip_table[((Y2 + Cg) >>13)];

  236. 			dest[8*i+6]=clip_table[((Y2 + Cr) >>13)];

  237. 		}

  238. 	}

  239. 	else if(dstFormat==IMGFMT_BGR24)

  240. 	{

  241. 		int i;

  242. 		for(i=0; i<(dstW>>1); i++){

  243. 			int j;

  244. 			int Y1=0;

  245. 			int Y2=0;

  246. 			int U=0;

  247. 			int V=0;

  248. 			int Cb, Cr, Cg;

  249. 			for(j=0; j<lumFilterSize; j++)

  250. 			{

  251. 				Y1 += lumSrc[j][2*i] * lumFilter[j];

  252. 				Y2 += lumSrc[j][2*i+1] * lumFilter[j];

  253. 			}

  254. 			for(j=0; j<chrFilterSize; j++)

  255. 			{

  256. 				U += chrSrc[j][i] * chrFilter[j];

  257. 				V += chrSrc[j][i+2048] * chrFilter[j];

  258. 			}

  259. 			Y1= clip_yuvtab_2568[ (Y1>>19) + 256 ];

  260. 			Y2= clip_yuvtab_2568[ (Y2>>19) + 256 ];

  261. 			U >>= 19;

  262. 			V >>= 19;

  263. 

  264. 			Cb= clip_yuvtab_40cf[U+ 256];

  265. 			Cg= clip_yuvtab_1a1e[V+ 256] + yuvtab_0c92[U+ 256];

  266. 			Cr= clip_yuvtab_3343[V+ 256];

  267. 

  268. 			dest[0]=clip_table[((Y1 + Cb) >>13)];

  269. 			dest[1]=clip_table[((Y1 + Cg) >>13)];

  270. 			dest[2]=clip_table[((Y1 + Cr) >>13)];

  271. 

  272. 			dest[3]=clip_table[((Y2 + Cb) >>13)];

  273. 			dest[4]=clip_table[((Y2 + Cg) >>13)];

  274. 			dest[5]=clip_table[((Y2 + Cr) >>13)];

  275. 			dest+=6;

  276. 		}

  277. 	}

  278. 	else if(dstFormat==IMGFMT_BGR16)

  279. 	{

  280. 		int i;

  281. 		for(i=0; i<(dstW>>1); i++){

  282. 			int j;

  283. 			int Y1=0;

  284. 			int Y2=0;

  285. 			int U=0;

  286. 			int V=0;

  287. 			int Cb, Cr, Cg;

  288. 			for(j=0; j<lumFilterSize; j++)

  289. 			{

  290. 				Y1 += lumSrc[j][2*i] * lumFilter[j];

  291. 				Y2 += lumSrc[j][2*i+1] * lumFilter[j];

  292. 			}

  293. 			for(j=0; j<chrFilterSize; j++)

  294. 			{

  295. 				U += chrSrc[j][i] * chrFilter[j];

  296. 				V += chrSrc[j][i+2048] * chrFilter[j];

  297. 			}

  298. 			Y1= clip_yuvtab_2568[ (Y1>>19) + 256 ];

  299. 			Y2= clip_yuvtab_2568[ (Y2>>19) + 256 ];

  300. 			U >>= 19;

  301. 			V >>= 19;

  302. 

  303. 			Cb= clip_yuvtab_40cf[U+ 256];

  304. 			Cg= clip_yuvtab_1a1e[V+ 256] + yuvtab_0c92[U+ 256];

  305. 			Cr= clip_yuvtab_3343[V+ 256];

  306. 

  307. 			((uint16_t*)dest)[2*i] =

  308. 				clip_table16b[(Y1 + Cb) >>13] |

  309. 				clip_table16g[(Y1 + Cg) >>13] |

  310. 				clip_table16r[(Y1 + Cr) >>13];

  311. 

  312. 			((uint16_t*)dest)[2*i+1] =

  313. 				clip_table16b[(Y2 + Cb) >>13] |

  314. 				clip_table16g[(Y2 + Cg) >>13] |

  315. 				clip_table16r[(Y2 + Cr) >>13];

  316. 		}

  317. 	}

  318. 	else if(dstFormat==IMGFMT_BGR15)

  319. 	{

  320. 		int i;

  321. 		for(i=0; i<(dstW>>1); i++){

  322. 			int j;

  323. 			int Y1=0;

  324. 			int Y2=0;

  325. 			int U=0;

  326. 			int V=0;

  327. 			int Cb, Cr, Cg;

  328. 			for(j=0; j<lumFilterSize; j++)

  329. 			{

  330. 				Y1 += lumSrc[j][2*i] * lumFilter[j];

  331. 				Y2 += lumSrc[j][2*i+1] * lumFilter[j];

  332. 			}

  333. 			for(j=0; j<chrFilterSize; j++)

  334. 			{

  335. 				U += chrSrc[j][i] * chrFilter[j];

  336. 				V += chrSrc[j][i+2048] * chrFilter[j];

  337. 			}

  338. 			Y1= clip_yuvtab_2568[ (Y1>>19) + 256 ];

  339. 			Y2= clip_yuvtab_2568[ (Y2>>19) + 256 ];

  340. 			U >>= 19;

  341. 			V >>= 19;

  342. 

  343. 			Cb= clip_yuvtab_40cf[U+ 256];

  344. 			Cg= clip_yuvtab_1a1e[V+ 256] + yuvtab_0c92[U+ 256];

  345. 			Cr= clip_yuvtab_3343[V+ 256];

  346. 

  347. 			((uint16_t*)dest)[2*i] =

  348. 				clip_table15b[(Y1 + Cb) >>13] |

  349. 				clip_table15g[(Y1 + Cg) >>13] |

  350. 				clip_table15r[(Y1 + Cr) >>13];

  351. 

  352. 			((uint16_t*)dest)[2*i+1] =

  353. 				clip_table15b[(Y2 + Cb) >>13] |

  354. 				clip_table15g[(Y2 + Cg) >>13] |

  355. 				clip_table15r[(Y2 + Cr) >>13];

  356. 		}

  357. 	}

  358. }

  359. 

  360. 

  361. //Note: we have C, X86, MMX, MMX2, 3DNOW version therse no 3DNOW+MMX2 one

  362. //Plain C versions

  363. #if !defined (HAVE_MMX) || defined (RUNTIME_CPUDETECT)

  364. #define COMPILE_C

  365. #endif

  366. 

  367. #ifdef CAN_COMPILE_X86_ASM

  368. 

  369. #if (defined (HAVE_MMX) && !defined (HAVE_3DNOW) && !defined (HAVE_MMX2)) || defined (RUNTIME_CPUDETECT)

  370. #define COMPILE_MMX

  371. #endif

  372. 

  373. #if defined (HAVE_MMX2) || defined (RUNTIME_CPUDETECT)

  374. #define COMPILE_MMX2

  375. #endif

  376. 

  377. #if (defined (HAVE_3DNOW) && !defined (HAVE_MMX2)) || defined (RUNTIME_CPUDETECT)

  378. #define COMPILE_3DNOW

  379. #endif

  380. #endif //CAN_COMPILE_X86_ASM

  381. 

  382. #undef HAVE_MMX

  383. #undef HAVE_MMX2

  384. #undef HAVE_3DNOW

  385. #undef ARCH_X86

  386. 

  387. #ifdef COMPILE_C

  388. #undef HAVE_MMX

  389. #undef HAVE_MMX2

  390. #undef HAVE_3DNOW

  391. #undef ARCH_X86

  392. #define RENAME(a) a ## _C

  393. #include "swscale_template.c"

  394. #endif

  395. 

  396. #ifdef CAN_COMPILE_X86_ASM

  397. 

  398. //X86 versions

  399. /*

  400. #undef RENAME

  401. #undef HAVE_MMX

  402. #undef HAVE_MMX2

  403. #undef HAVE_3DNOW

  404. #define ARCH_X86

  405. #define RENAME(a) a ## _X86

  406. #include "swscale_template.c"

  407. */

  408. //MMX versions

  409. #ifdef COMPILE_MMX

  410. #undef RENAME

  411. #define HAVE_MMX

  412. #undef HAVE_MMX2

  413. #undef HAVE_3DNOW

  414. #define ARCH_X86

  415. #define RENAME(a) a ## _MMX

  416. #include "swscale_template.c"

  417. #endif

  418. 

  419. //MMX2 versions

  420. #ifdef COMPILE_MMX2

  421. #undef RENAME

  422. #define HAVE_MMX

  423. #define HAVE_MMX2

  424. #undef HAVE_3DNOW

  425. #define ARCH_X86

  426. #define RENAME(a) a ## _MMX2

  427. #include "swscale_template.c"

  428. #endif

  429. 

  430. //3DNOW versions

  431. #ifdef COMPILE_3DNOW

  432. #undef RENAME

  433. #define HAVE_MMX

  434. #undef HAVE_MMX2

  435. #define HAVE_3DNOW

  436. #define ARCH_X86

  437. #define RENAME(a) a ## _3DNow

  438. #include "swscale_template.c"

  439. #endif

  440. 

  441. #endif //CAN_COMPILE_X86_ASM

  442. 

  443. // minor note: the HAVE_xyz is messed up after that line so dont use it

  444. 

  445. 

  446. // old global scaler, dont use for new code

  447. // will use sws_flags from the command line

  448. void SwScale_YV12slice(unsigned char* src[], int srcStride[], int srcSliceY ,

  449. 			     int srcSliceH, uint8_t* dst[], int dstStride, int dstbpp,

  450. 			     int srcW, int srcH, int dstW, int dstH){

  451. 

  452. 	static SwsContext *context=NULL;

  453. 	int dstFormat;

  454. 	int flags=0;

  455. 	static int firstTime=1;

  456. 	int dstStride3[3]= {dstStride, dstStride>>1, dstStride>>1};

  457. 

  458. 	if(firstTime)

  459. 	{

  460. 		flags= SWS_PRINT_INFO;

  461. 		firstTime=0;

  462. 	}

  463. 

  464. 	switch(dstbpp)

  465. 	{

  466. 		case 8 : dstFormat= IMGFMT_Y8;		break;

  467. 		case 12: dstFormat= IMGFMT_YV12;	break;

  468. 		case 15: dstFormat= IMGFMT_BGR15;	break;

  469. 		case 16: dstFormat= IMGFMT_BGR16;	break;

  470. 		case 24: dstFormat= IMGFMT_BGR24;	break;

  471. 		case 32: dstFormat= IMGFMT_BGR32;	break;

  472. 		default: return;

  473. 	}

  474. 

  475. 	switch(sws_flags)

  476. 	{

  477. 		case 0: flags|= SWS_FAST_BILINEAR; break;

  478. 		case 1: flags|= SWS_BILINEAR; break;

  479. 		case 2: flags|= SWS_BICUBIC; break;

  480. 		case 3: flags|= SWS_X; break;

  481. 		default:flags|= SWS_BILINEAR; break;

  482. 	}

  483. 

  484. 	if(!context) context=getSwsContext(srcW, srcH, IMGFMT_YV12, dstW, dstH, dstFormat, flags, NULL, NULL);

  485. 

  486. 

  487. 	swScale(context, src, srcStride, srcSliceY, srcSliceH, dst, dstStride3);

  488. }

  489. 

  490. static inline void initFilter(int16_t *dstFilter, int16_t *filterPos, int *filterSize, int xInc,

  491. 			      int srcW, int dstW, int filterAlign, int one, int flags)

  492. {

  493. 	int i;

  494. 	double filter[10000];

  495. #ifdef ARCH_X86

  496. 	if(gCpuCaps.hasMMX)

  497. 		asm volatile("emms\n\t"::: "memory"); //FIXME this shouldnt be required but it IS (even for non mmx versions)

  498. #endif

  499. 

  500. 	if(ABS(xInc - 0x10000) <10) // unscaled

  501. 	{

  502. 		int i;

  503. 		*filterSize= (1 +(filterAlign-1)) & (~(filterAlign-1)); // 1 or 4 normaly

  504. 		for(i=0; i<dstW*(*filterSize); i++) filter[i]=0;

  505. 

  506. 		for(i=0; i<dstW; i++)

  507. 		{

  508. 			filter[i*(*filterSize)]=1;

  509. 			filterPos[i]=i;

  510. 		}

  511. 

  512. 	}

  513. 	else if(xInc <= (1<<16) || (flags&SWS_FAST_BILINEAR)) // upscale

  514. 	{

  515. 		int i;

  516. 		int xDstInSrc;

  517. 		if     (flags&SWS_BICUBIC) *filterSize= 4;

  518. 		else if(flags&SWS_X      ) *filterSize= 4;

  519. 		else			   *filterSize= 2;

  520. //		printf("%d %d %d\n", filterSize, srcW, dstW);

  521. 		*filterSize= (*filterSize +(filterAlign-1)) & (~(filterAlign-1));

  522. 

  523. 		xDstInSrc= xInc/2 - 0x8000;

  524. 		for(i=0; i<dstW; i++)

  525. 		{

  526. 			int xx= (xDstInSrc>>16) - (*filterSize>>1) + 1;

  527. 			int j;

  528. 

  529. 			filterPos[i]= xx;

  530. 			if((flags & SWS_BICUBIC) || (flags & SWS_X))

  531. 			{

  532. 				double d= ABS(((xx+1)<<16) - xDstInSrc)/(double)(1<<16);

  533. 				double y1,y2,y3,y4;

  534. 				double A= -0.6;

  535. 				if(flags & SWS_BICUBIC){

  536. 						// Equation is from VirtualDub

  537. 					y1 = (        +     A*d -       2.0*A*d*d +       A*d*d*d);

  538. 					y2 = (+ 1.0             -     (A+3.0)*d*d + (A+2.0)*d*d*d);

  539. 					y3 = (        -     A*d + (2.0*A+3.0)*d*d - (A+2.0)*d*d*d);

  540. 					y4 = (                  +           A*d*d -       A*d*d*d);

  541. 				}else{

  542. 						// cubic interpolation (derived it myself)

  543. 					y1 = (    -2.0*d + 3.0*d*d - 1.0*d*d*d)/6.0;

  544. 					y2 = (6.0 -3.0*d - 6.0*d*d + 3.0*d*d*d)/6.0;

  545. 					y3 = (    +6.0*d + 3.0*d*d - 3.0*d*d*d)/6.0;

  546. 					y4 = (    -1.0*d           + 1.0*d*d*d)/6.0;

  547. 				}

  548. 

  549. //				printf("%d %d %d \n", coeff, (int)d, xDstInSrc);

  550. 				filter[i*(*filterSize) + 0]= y1;

  551. 				filter[i*(*filterSize) + 1]= y2;

  552. 				filter[i*(*filterSize) + 2]= y3;

  553. 				filter[i*(*filterSize) + 3]= y4;

  554. //				printf("%1.3f %1.3f %1.3f %1.3f %1.3f\n",d , y1, y2, y3, y4);

  555. 			}

  556. 			else

  557. 			{

  558. 				for(j=0; j<*filterSize; j++)

  559. 				{

  560. 					double d= ABS((xx<<16) - xDstInSrc)/(double)(1<<16);

  561. 					double coeff= 1.0 - d;

  562. 					if(coeff<0) coeff=0;

  563. 	//				printf("%d %d %d \n", coeff, (int)d, xDstInSrc);

  564. 					filter[i*(*filterSize) + j]= coeff;

  565. 					xx++;

  566. 				}

  567. 			}

  568. 			xDstInSrc+= xInc;

  569. 		}

  570. 	}

  571. 	else // downscale

  572. 	{

  573. 		int xDstInSrc;

  574. 		if(flags&SWS_BICUBIC) *filterSize= (int)ceil(1 + 4.0*srcW / (double)dstW);

  575. 		else if(flags&SWS_X)  *filterSize= (int)ceil(1 + 4.0*srcW / (double)dstW);

  576. 		else		      *filterSize= (int)ceil(1 + 2.0*srcW / (double)dstW);

  577. //		printf("%d %d %d\n", *filterSize, srcW, dstW);

  578. 		*filterSize= (*filterSize +(filterAlign-1)) & (~(filterAlign-1));

  579. 

  580. 		xDstInSrc= xInc/2 - 0x8000;

  581. 		for(i=0; i<dstW; i++)

  582. 		{

  583. 			int xx= (int)((double)xDstInSrc/(double)(1<<16) - ((*filterSize)-1)*0.5 + 0.5);

  584. 			int j;

  585. 			filterPos[i]= xx;

  586. 			for(j=0; j<*filterSize; j++)

  587. 			{

  588. 				double d= ABS((xx<<16) - xDstInSrc)/(double)xInc;

  589. 				double coeff;

  590. 				if((flags & SWS_BICUBIC) || (flags & SWS_X))

  591. 				{

  592. 					double A= -0.75;

  593. //					d*=2;

  594. 					// Equation is from VirtualDub

  595. 					if(d<1.0)

  596. 						coeff = (1.0 - (A+3.0)*d*d + (A+2.0)*d*d*d);

  597. 					else if(d<2.0)

  598. 						coeff = (-4.0*A + 8.0*A*d - 5.0*A*d*d + A*d*d*d);

  599. 					else

  600. 						coeff=0.0;

  601. 				}

  602. /*				else if(flags & SWS_X)

  603. 				{

  604. 				}*/

  605. 				else

  606. 				{

  607. 					coeff= 1.0 - d;

  608. 					if(coeff<0) coeff=0;

  609. 				}

  610. //				printf("%1.3f %d %d \n", coeff, (int)d, xDstInSrc);

  611. 				filter[i*(*filterSize) + j]= coeff;

  612. 				xx++;

  613. 			}

  614. 			xDstInSrc+= xInc;

  615. 		}

  616. 	}

  617. 

  618. 	//fix borders

  619. 	for(i=0; i<dstW; i++)

  620. 	{

  621. 		int j;

  622. 		if(filterPos[i] < 0)

  623. 		{

  624. 			// Move filter coeffs left to compensate for filterPos

  625. 			for(j=1; j<*filterSize; j++)

  626. 			{

  627. 				int left= MAX(j + filterPos[i], 0);

  628. 				filter[i*(*filterSize) + left] += filter[i*(*filterSize) + j];

  629. 				filter[i*(*filterSize) + j]=0;

  630. 			}

  631. 			filterPos[i]= 0;

  632. 		}

  633. 

  634. 		if(filterPos[i] + (*filterSize) > srcW)

  635. 		{

  636. 			int shift= filterPos[i] + (*filterSize) - srcW;

  637. 			// Move filter coeffs right to compensate for filterPos

  638. 			for(j=(*filterSize)-2; j>=0; j--)

  639. 			{

  640. 				int right= MIN(j + shift, (*filterSize)-1);

  641. 				filter[i*(*filterSize) +right] += filter[i*(*filterSize) +j];

  642. 				filter[i*(*filterSize) +j]=0;

  643. 			}

  644. 			filterPos[i]= srcW - (*filterSize);

  645. 		}

  646. 	}

  647. 

  648. 	//FIXME try to align filterpos if possible / try to shift filterpos to put zeros at the end

  649. 	// and skip these than later

  650. 

  651. 	//Normalize

  652. 	for(i=0; i<dstW; i++)

  653. 	{

  654. 		int j;

  655. 		double sum=0;

  656. 		double scale= one;

  657. 		for(j=0; j<*filterSize; j++)

  658. 		{

  659. 			sum+= filter[i*(*filterSize) + j];

  660. 		}

  661. 		scale/= sum;

  662. 		for(j=0; j<*filterSize; j++)

  663. 		{

  664. 			dstFilter[i*(*filterSize) + j]= (int)(filter[i*(*filterSize) + j]*scale);

  665. 		}

  666. 	}

  667. }

  668. 

  669. #ifdef ARCH_X86

  670. static void initMMX2HScaler(int dstW, int xInc, uint8_t *funnyCode)

  671. {

  672. 	uint8_t *fragment;

  673. 	int imm8OfPShufW1;

  674. 	int imm8OfPShufW2;

  675. 	int fragmentLength;

  676. 

  677. 	int xpos, i;

  678. 

  679. 	// create an optimized horizontal scaling routine

  680. 

  681. 	//code fragment

  682. 

  683. 	asm volatile(

  684. 		"jmp 9f				\n\t"

  685. 	// Begin

  686. 		"0:				\n\t"

  687. 		"movq (%%esi), %%mm0		\n\t" //FIXME Alignment

  688. 		"movq %%mm0, %%mm1		\n\t"

  689. 		"psrlq $8, %%mm0		\n\t"

  690. 		"punpcklbw %%mm7, %%mm1	\n\t"

  691. 		"movq %%mm2, %%mm3		\n\t"

  692. 		"punpcklbw %%mm7, %%mm0	\n\t"

  693. 		"addw %%bx, %%cx		\n\t" //2*xalpha += (4*lumXInc)&0xFFFF

  694. 		"pshufw $0xFF, %%mm1, %%mm1	\n\t"

  695. 		"1:				\n\t"

  696. 		"adcl %%edx, %%esi		\n\t" //xx+= (4*lumXInc)>>16 + carry

  697. 		"pshufw $0xFF, %%mm0, %%mm0	\n\t"

  698. 		"2:				\n\t"

  699. 		"psrlw $9, %%mm3		\n\t"

  700. 		"psubw %%mm1, %%mm0		\n\t"

  701. 		"pmullw %%mm3, %%mm0		\n\t"

  702. 		"paddw %%mm6, %%mm2		\n\t" // 2*alpha += xpos&0xFFFF

  703. 		"psllw $7, %%mm1		\n\t"

  704. 		"paddw %%mm1, %%mm0		\n\t"

  705. 

  706. 		"movq %%mm0, (%%edi, %%eax)	\n\t"

  707. 

  708. 		"addl $8, %%eax			\n\t"

  709. 	// End

  710. 		"9:				\n\t"

  711. //		"int $3\n\t"

  712. 		"leal 0b, %0			\n\t"

  713. 		"leal 1b, %1			\n\t"

  714. 		"leal 2b, %2			\n\t"

  715. 		"decl %1			\n\t"

  716. 		"decl %2			\n\t"

  717. 		"subl %0, %1			\n\t"

  718. 		"subl %0, %2			\n\t"

  719. 		"leal 9b, %3			\n\t"

  720. 		"subl %0, %3			\n\t"

  721. 		:"=r" (fragment), "=r" (imm8OfPShufW1), "=r" (imm8OfPShufW2),

  722. 		"=r" (fragmentLength)

  723. 	);

  724. 

  725. 	xpos= 0; //lumXInc/2 - 0x8000; // difference between pixel centers

  726. 

  727. 	for(i=0; i<dstW/8; i++)

  728. 	{

  729. 		int xx=xpos>>16;

  730. 

  731. 		if((i&3) == 0)

  732. 		{

  733. 			int a=0;

  734. 			int b=((xpos+xInc)>>16) - xx;

  735. 			int c=((xpos+xInc*2)>>16) - xx;

  736. 			int d=((xpos+xInc*3)>>16) - xx;

  737. 

  738. 			memcpy(funnyCode + fragmentLength*i/4, fragment, fragmentLength);

  739. 

  740. 			funnyCode[fragmentLength*i/4 + imm8OfPShufW1]=

  741. 			funnyCode[fragmentLength*i/4 + imm8OfPShufW2]=

  742. 				a | (b<<2) | (c<<4) | (d<<6);

  743. 

  744. 			// if we dont need to read 8 bytes than dont :), reduces the chance of

  745. 			// crossing a cache line

  746. 			if(d<3) funnyCode[fragmentLength*i/4 + 1]= 0x6E;

  747. 

  748. 			funnyCode[fragmentLength*(i+4)/4]= RET;

  749. 		}

  750. 		xpos+=xInc;

  751. 	}

  752. }

  753. #endif // ARCH_X86

  754. 

  755. //FIXME remove

  756. void SwScale_Init(){

  757. }

  758. 

  759. static void globalInit(){

  760.     // generating tables:

  761.     int i;

  762.     for(i=0; i<768; i++){

  763. 	int c= MIN(MAX(i-256, 0), 255);

  764. 	clip_table[i]=c;

  765. 	yuvtab_2568[c]= clip_yuvtab_2568[i]=(0x2568*(c-16))+(256<<13);

  766. 	yuvtab_3343[c]= clip_yuvtab_3343[i]=0x3343*(c-128);

  767. 	yuvtab_0c92[c]= clip_yuvtab_0c92[i]=-0x0c92*(c-128);

  768. 	yuvtab_1a1e[c]= clip_yuvtab_1a1e[i]=-0x1a1e*(c-128);

  769. 	yuvtab_40cf[c]= clip_yuvtab_40cf[i]=0x40cf*(c-128);

  770.     }

  771. 

  772.     for(i=0; i<768; i++)

  773.     {

  774. 	int v= clip_table[i];

  775. 	clip_table16b[i]= v>>3;

  776. 	clip_table16g[i]= (v<<3)&0x07E0;

  777. 	clip_table16r[i]= (v<<8)&0xF800;

  778. 	clip_table15b[i]= v>>3;

  779. 	clip_table15g[i]= (v<<2)&0x03E0;

  780. 	clip_table15r[i]= (v<<7)&0x7C00;

  781.     }

  782. 

  783. cpuCaps= gCpuCaps;

  784. 

  785. #ifdef RUNTIME_CPUDETECT

  786. #ifdef CAN_COMPILE_X86_ASM

  787. 	// ordered per speed fasterst first

  788. 	if(gCpuCaps.hasMMX2)

  789. 		swScale= swScale_MMX2;

  790. 	else if(gCpuCaps.has3DNow)

  791. 		swScale= swScale_3DNow;

  792. 	else if(gCpuCaps.hasMMX)

  793. 		swScale= swScale_MMX;

  794. 	else

  795. 		swScale= swScale_C;

  796. 

  797. #else

  798. 	swScale= swScale_C;

  799. 	cpuCaps.hasMMX2 = cpuCaps.hasMMX = cpuCaps.has3DNow = 0;

  800. #endif

  801. #else //RUNTIME_CPUDETECT

  802. #ifdef HAVE_MMX2

  803. 	swScale= swScale_MMX2;

  804. 	cpuCaps.has3DNow = 0;

  805. #elif defined (HAVE_3DNOW)

  806. 	swScale= swScale_3DNow;

  807. 	cpuCaps.hasMMX2 = 0;

  808. #elif defined (HAVE_MMX)

  809. 	swScale= swScale_MMX;

  810. 	cpuCaps.hasMMX2 = cpuCaps.has3DNow = 0;

  811. #else

  812. 	swScale= swScale_C;

  813. 	cpuCaps.hasMMX2 = cpuCaps.hasMMX = cpuCaps.has3DNow = 0;

  814. #endif

  815. #endif //!RUNTIME_CPUDETECT

  816. }

  817. 

  818. 

  819. SwsContext *getSwsContext(int srcW, int srcH, int srcFormat, int dstW, int dstH, int dstFormat, int flags,

  820.                          SwsFilter *srcFilter, SwsFilter *dstFilter){

  821. 

  822. 	const int widthAlign= dstFormat==IMGFMT_YV12 ? 16 : 8;

  823. 	SwsContext *c;

  824. 	int i;

  825. //const int bytespp= (dstbpp+1)/8; //(12->1, 15&16->2, 24->3, 32->4)

  826. //const int over= dstFormat==IMGFMT_YV12 ? 	  (((dstW+15)&(~15))) - dststride

  827. //						: (((dstW+7)&(~7)))*bytespp - dststride;

  828. 	if(swScale==NULL) globalInit();

  829. 

  830. 	/* sanity check */

  831. 	if(srcW<1 || srcH<1 || dstW<1 || dstH<1) return NULL;

  832. 	if(srcW>=SWS_MAX_SIZE || dstW>=SWS_MAX_SIZE || srcH>=SWS_MAX_SIZE || dstH>=SWS_MAX_SIZE)

  833. 	{

  834. 		fprintf(stderr, "size is too large, increase SWS_MAX_SIZE\n");

  835. 		return NULL;

  836. 	}

  837. 

  838. /* FIXME

  839. 	if(dstStride[0]%widthAlign !=0 )

  840. 	{

  841. 		if(flags & SWS_PRINT_INFO)

  842. 			fprintf(stderr, "SwScaler: Warning: dstStride is not a multiple of %d!\n"

  843. 					"SwScaler:          ->cannot do aligned memory acesses anymore\n",

  844. 					widthAlign);

  845. 	}

  846. */

  847. 	c= memalign(64, sizeof(SwsContext));

  848. 

  849. 	c->srcW= srcW;

  850. 	c->srcH= srcH;

  851. 	c->dstW= dstW;

  852. 	c->dstH= dstH;

  853. 	c->lumXInc= ((srcW<<16) + (1<<15))/dstW;

  854. 	c->lumYInc= ((srcH<<16) + (1<<15))/dstH;

  855. 	c->flags= flags;

  856. 	c->dstFormat= dstFormat;

  857. 	c->srcFormat= srcFormat;

  858. 

  859. 	if(cpuCaps.hasMMX2)

  860. 	{

  861. 		c->canMMX2BeUsed= (dstW >=srcW && (dstW&31)==0 && (srcW&15)==0) ? 1 : 0;

  862. 		if(!c->canMMX2BeUsed && dstW >=srcW && (srcW&15)==0 && (flags&SWS_FAST_BILINEAR))

  863. 		{

  864. 			if(flags&SWS_PRINT_INFO)

  865. 				fprintf(stderr, "SwScaler: output Width is not a multiple of 32 -> no MMX2 scaler\n");

  866. 		}

  867. 	}

  868. 	else

  869. 		c->canMMX2BeUsed=0;

  870. 

  871. 	// match pixel 0 of the src to pixel 0 of dst and match pixel n-2 of src to pixel n-2 of dst

  872. 	// but only for the FAST_BILINEAR mode otherwise do correct scaling

  873. 	// n-2 is the last chrominance sample available

  874. 	// this is not perfect, but noone shuld notice the difference, the more correct variant

  875. 	// would be like the vertical one, but that would require some special code for the

  876. 	// first and last pixel

  877. 	if(flags&SWS_FAST_BILINEAR)

  878. 	{

  879. 		if(c->canMMX2BeUsed) 	c->lumXInc+= 20;

  880. 		//we dont use the x86asm scaler if mmx is available

  881. 		else if(cpuCaps.hasMMX)	c->lumXInc = ((srcW-2)<<16)/(dstW-2) - 20;

  882. 	}

  883. 

  884. 	/* set chrXInc & chrDstW */

  885. 	if((flags&SWS_FULL_UV_IPOL) && dstFormat!=IMGFMT_YV12)

  886. 		c->chrXInc= c->lumXInc>>1, c->chrDstW= dstW;

  887. 	else

  888. 		c->chrXInc= c->lumXInc,    c->chrDstW= (dstW+1)>>1;

  889. 

  890. 	/* set chrYInc & chrDstH */

  891. 	if(dstFormat==IMGFMT_YV12)	c->chrYInc= c->lumYInc,    c->chrDstH= (dstH+1)>>1;

  892. 	else				c->chrYInc= c->lumYInc>>1, c->chrDstH= dstH;

  893. 

  894. 	/* precalculate horizontal scaler filter coefficients */

  895. 	{

  896. 		const int filterAlign= cpuCaps.hasMMX ? 4 : 1;

  897. 

  898. 		initFilter(c->hLumFilter, c->hLumFilterPos, &c->hLumFilterSize, c->lumXInc,

  899. 				 srcW      ,       dstW, filterAlign, 1<<14, flags);

  900. 		initFilter(c->hChrFilter, c->hChrFilterPos, &c->hChrFilterSize, c->chrXInc,

  901. 				(srcW+1)>>1, c->chrDstW, filterAlign, 1<<14, flags);

  902. 

  903. #ifdef ARCH_X86

  904. // cant downscale !!!

  905. 		if(c->canMMX2BeUsed && (flags & SWS_FAST_BILINEAR))

  906. 		{

  907. 			initMMX2HScaler(      dstW, c->lumXInc, c->funnyYCode);

  908. 			initMMX2HScaler(c->chrDstW, c->chrXInc, c->funnyUVCode);

  909. 		}

  910. #endif

  911. 	} // Init Horizontal stuff

  912. 

  913. 

  914. 

  915. 	/* precalculate vertical scaler filter coefficients */

  916. 	initFilter(c->vLumFilter, c->vLumFilterPos, &c->vLumFilterSize, c->lumYInc,

  917. 			srcH      ,        dstH, 1, (1<<12)-4, flags);

  918. 	initFilter(c->vChrFilter, c->vChrFilterPos, &c->vChrFilterSize, c->chrYInc,

  919. 			(srcH+1)>>1, c->chrDstH, 1, (1<<12)-4, flags);

  920. 

  921. 	// Calculate Buffer Sizes so that they wont run out while handling these damn slices

  922. 	c->vLumBufSize= c->vLumFilterSize;

  923. 	c->vChrBufSize= c->vChrFilterSize;

  924. 	for(i=0; i<dstH; i++)

  925. 	{

  926. 		int chrI= i*c->chrDstH / dstH;

  927. 		int nextSlice= MAX(c->vLumFilterPos[i   ] + c->vLumFilterSize - 1,

  928. 				 ((c->vChrFilterPos[chrI] + c->vChrFilterSize - 1)<<1));

  929. 		nextSlice&= ~1; // Slices start at even boundaries

  930. 		if(c->vLumFilterPos[i   ] + c->vLumBufSize < nextSlice)

  931. 			c->vLumBufSize= nextSlice - c->vLumFilterPos[i   ];

  932. 		if(c->vChrFilterPos[chrI] + c->vChrBufSize < (nextSlice>>1))

  933. 			c->vChrBufSize= (nextSlice>>1) - c->vChrFilterPos[chrI];

  934. 	}

  935. 

  936. 	// allocate pixbufs (we use dynamic allocation because otherwise we would need to

  937. 	// allocate several megabytes to handle all possible cases)

  938. 	for(i=0; i<c->vLumBufSize; i++)

  939. 		c->lumPixBuf[i]= c->lumPixBuf[i+c->vLumBufSize]= (uint16_t*)memalign(8, 4000);

  940. 	for(i=0; i<c->vChrBufSize; i++)

  941. 		c->chrPixBuf[i]= c->chrPixBuf[i+c->vChrBufSize]= (uint16_t*)memalign(8, 8000);

  942. 

  943. 	//try to avoid drawing green stuff between the right end and the stride end

  944. 	for(i=0; i<c->vLumBufSize; i++) memset(c->lumPixBuf[i], 0, 4000);

  945. 	for(i=0; i<c->vChrBufSize; i++) memset(c->chrPixBuf[i], 64, 8000);

  946. 

  947. 	ASSERT(c->chrDstH <= dstH)

  948. 	ASSERT(c->vLumFilterSize*      dstH*4 <= SWS_MAX_SIZE*20)

  949. 	ASSERT(c->vChrFilterSize*c->chrDstH*4 <= SWS_MAX_SIZE*20)

  950. 

  951. 	// pack filter data for mmx code

  952. 	if(cpuCaps.hasMMX)

  953. 	{

  954. 		for(i=0; i<c->vLumFilterSize*dstH; i++)

  955. 			c->lumMmxFilter[4*i]=c->lumMmxFilter[4*i+1]=c->lumMmxFilter[4*i+2]=c->lumMmxFilter[4*i+3]=

  956. 				c->vLumFilter[i];

  957. 		for(i=0; i<c->vChrFilterSize*c->chrDstH; i++)

  958. 			c->chrMmxFilter[4*i]=c->chrMmxFilter[4*i+1]=c->chrMmxFilter[4*i+2]=c->chrMmxFilter[4*i+3]=

  959. 				c->vChrFilter[i];

  960. 	}

  961. 

  962. 	if(flags&SWS_PRINT_INFO)

  963. 	{

  964. #ifdef DITHER1XBPP

  965. 		char *dither= cpuCaps.hasMMX ? " dithered" : "";

  966. #endif

  967. 		if(flags&SWS_FAST_BILINEAR)

  968. 			fprintf(stderr, "\nSwScaler: FAST_BILINEAR scaler ");

  969. 		else if(flags&SWS_BILINEAR)

  970. 			fprintf(stderr, "\nSwScaler: BILINEAR scaler ");

  971. 		else if(flags&SWS_BICUBIC)

  972. 			fprintf(stderr, "\nSwScaler: BICUBIC scaler ");

  973. 		else

  974. 			fprintf(stderr, "\nSwScaler: ehh flags invalid?! ");

  975. 

  976. 		if(dstFormat==IMGFMT_BGR15)

  977. 			fprintf(stderr, "with%s BGR15 output ", dither);

  978. 		else if(dstFormat==IMGFMT_BGR16)

  979. 			fprintf(stderr, "with%s BGR16 output ", dither);

  980. 		else if(dstFormat==IMGFMT_BGR24)

  981. 			fprintf(stderr, "with BGR24 output ");

  982. 		else if(dstFormat==IMGFMT_BGR32)

  983. 			fprintf(stderr, "with BGR32 output ");

  984. 		else if(dstFormat==IMGFMT_YV12)

  985. 			fprintf(stderr, "with YV12 output ");

  986. 		else

  987. 			fprintf(stderr, "without output ");

  988. 

  989. 		if(cpuCaps.hasMMX2)

  990. 			fprintf(stderr, "using MMX2\n");

  991. 		else if(cpuCaps.has3DNow)

  992. 			fprintf(stderr, "using 3DNOW\n");

  993. 		else if(cpuCaps.hasMMX)

  994. 			fprintf(stderr, "using MMX\n");

  995. 		else

  996. 			fprintf(stderr, "using C\n");

  997. 	}

  998. 

  999. 	if((flags & SWS_PRINT_INFO) && verbose)

  1000. 	{

  1001. 		if(cpuCaps.hasMMX)

  1002. 		{

  1003. 			if(c->canMMX2BeUsed && (flags&SWS_FAST_BILINEAR))

  1004. 				printf("SwScaler: using FAST_BILINEAR MMX2 scaler for horizontal scaling\n");

  1005. 			else

  1006. 			{

  1007. 				if(c->hLumFilterSize==4)

  1008. 					printf("SwScaler: using 4-tap MMX scaler for horizontal luminance scaling\n");

  1009. 				else if(c->hLumFilterSize==8)

  1010. 					printf("SwScaler: using 8-tap MMX scaler for horizontal luminance scaling\n");

  1011. 				else

  1012. 					printf("SwScaler: using n-tap MMX scaler for horizontal luminance scaling\n");

  1013. 

  1014. 				if(c->hChrFilterSize==4)

  1015. 					printf("SwScaler: using 4-tap MMX scaler for horizontal chrominance scaling\n");

  1016. 				else if(c->hChrFilterSize==8)

  1017. 					printf("SwScaler: using 8-tap MMX scaler for horizontal chrominance scaling\n");

  1018. 				else

  1019. 					printf("SwScaler: using n-tap MMX scaler for horizontal chrominance scaling\n");

  1020. 			}

  1021. 		}

  1022. 		else

  1023. 		{

  1024. #ifdef ARCH_X86

  1025. 			printf("SwScaler: using X86-Asm scaler for horizontal scaling\n");

  1026. #else

  1027. 			if(flags & SWS_FAST_BILINEAR)

  1028. 				printf("SwScaler: using FAST_BILINEAR C scaler for horizontal scaling\n");

  1029. 			else

  1030. 				printf("SwScaler: using C scaler for horizontal scaling\n");

  1031. #endif

  1032. 		}

  1033. 		if(dstFormat==IMGFMT_YV12)

  1034. 		{

  1035. 			if(c->vLumFilterSize==1)

  1036. 				printf("SwScaler: using 1-tap %s \"scaler\" for vertical scaling (YV12)\n", cpuCaps.hasMMX ? "MMX" : "C");

  1037. 			else

  1038. 				printf("SwScaler: using n-tap %s scaler for vertical scaling (YV12)\n", cpuCaps.hasMMX ? "MMX" : "C");

  1039. 		}

  1040. 		else

  1041. 		{

  1042. 			if(c->vLumFilterSize==1 && c->vChrFilterSize==2)

  1043. 				printf("SwScaler: using 1-tap %s \"scaler\" for vertical luminance scaling (BGR)\n"

  1044. 				       "SwScaler:       2-tap scaler for vertical chrominance scaling (BGR)\n",cpuCaps.hasMMX ? "MMX" : "C");

  1045. 			else if(c->vLumFilterSize==2 && c->vChrFilterSize==2)

  1046. 				printf("SwScaler: using 2-tap linear %s scaler for vertical scaling (BGR)\n", cpuCaps.hasMMX ? "MMX" : "C");

  1047. 			else

  1048. 				printf("SwScaler: using n-tap %s scaler for vertical scaling (BGR)\n", cpuCaps.hasMMX ? "MMX" : "C");

  1049. 		}

  1050. 

  1051. 		if(dstFormat==IMGFMT_BGR24)

  1052. 			printf("SwScaler: using %s YV12->BGR24 Converter\n",

  1053. 				cpuCaps.hasMMX2 ? "MMX2" : (cpuCaps.hasMMX ? "MMX" : "C"));

  1054. 		else

  1055. 			printf("SwScaler: using %s YV12->BGR Converter\n", cpuCaps.hasMMX ? "MMX" : "C");//FIXME print format

  1056. 

  1057. 		printf("SwScaler: %dx%d -> %dx%d\n", srcW, srcH, dstW, dstH);

  1058. 	}

  1059. 

  1060. 	return c;

  1061. }

  1062. 

  1063. /**

  1064.  * returns a normalized gaussian curve used to filter stuff

  1065.  * quality=3 is high quality, lowwer is lowwer quality

  1066.  */

  1067. double *getGaussian(double variance, double quality){

  1068. 	const int length= (int)(variance*quality + 0.5) | 1;

  1069. 	int i;

  1070. 	double *coeff= memalign(sizeof(double), length*sizeof(double));

  1071. 	double middle= (length-1)*0.5;

  1072. 

  1073. 	for(i=0; i<length; i++)

  1074. 	{

  1075. 		double dist= i-middle;

  1076. 		coeff[i]= exp( -dist*dist/(2*variance*variance) ) / sqrt(2*variance*PI);

  1077. 	}

  1078. 

  1079. 	normalize(coeff, length, 1.0);

  1080. 	return coeff;

  1081. }

  1082. 

  1083. void normalize(double *coeff, int length, double height){

  1084. 	int i;

  1085. 	double sum=0;

  1086. 	double inv;

  1087. 

  1088. 	for(i=0; i<length; i++)

  1089. 		sum+= coeff[i];

  1090. 

  1091. 	inv= height/sum;

  1092. 

  1093. 	for(i=0; i<length; i++)

  1094. 		coeff[i]*= height;

  1095. }

  1096. 

  1097. double *conv(double *a, int aLength, double *b, int bLength){

  1098. 	int length= aLength + bLength - 1;

  1099. 	double *coeff= memalign(sizeof(double), length*sizeof(double));

  1100. 	int i, j;

  1101. 

  1102. 	for(i=0; i<length; i++) coeff[i]= 0.0;

  1103. 

  1104. 	for(i=0; i<aLength; i++)

  1105. 	{

  1106. 		for(j=0; j<bLength; j++)

  1107. 		{

  1108. 			coeff[i+j]+= a[i]*b[j];

  1109. 		}

  1110. 	}

  1111. 

  1112. 	return coeff;

  1113. }

  1114. 

  1115. /*

  1116. double *sum(double *a, int aLength, double *b, int bLength){

  1117. 	int length= MAX(aLength, bLength);

  1118. 	double *coeff= memalign(sizeof(double), length*sizeof(double));

  1119. 	int i;

  1120. 

  1121. 	for(i=0; i<length; i++) coeff[i]= 0.0;

  1122. 

  1123. 	for(i=0; i<aLength; i++) coeff[i]+= a[i];

  1124. }

  1125. */