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FFmpeg/libavcodec/i386/mpegvideo_mmx.c

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  1. /*

  2.  * The simplest mpeg encoder (well, it was the simplest!)

  3.  * Copyright (c) 2000,2001 Gerard Lantau.

  4.  *

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

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

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

  8.  * (at your option) any later version.

  9.  *

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

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

  12.  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

  13.  * GNU General Public License for more details.

  14.  *

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

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

  17.  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.

  18.  *

  19.  * Optimized for ia32 cpus by Nick Kurshev <nickols_k@mail.ru>

  20.  */

  21. 

  22. #include "../dsputil.h"

  23. #include "../mpegvideo.h"

  24. 

  25. #if 0

  26. 

  27. /* XXX: GL: I don't understand why this function needs optimization

  28.    (it is called only once per frame!), so I disabled it */

  29. 

  30. void MPV_frame_start(MpegEncContext *s)

  31. {

  32.     if (s->pict_type == B_TYPE) {

  33. 	__asm __volatile(

  34. 	    "movl	(%1), %%eax\n\t"

  35. 	    "movl	4(%1), %%edx\n\t"

  36. 	    "movl	8(%1), %%ecx\n\t"

  37. 	    "movl	%%eax, (%0)\n\t"

  38. 	    "movl	%%edx, 4(%0)\n\t"

  39. 	    "movl	%%ecx, 8(%0)\n\t"

  40. 	    :

  41. 	    :"r"(s->current_picture), "r"(s->aux_picture)

  42. 	    :"eax","edx","ecx","memory");

  43.     } else {

  44.             /* swap next and last */

  45. 	__asm __volatile(

  46. 	    "movl	(%1), %%eax\n\t"

  47. 	    "movl	4(%1), %%edx\n\t"

  48. 	    "movl	8(%1), %%ecx\n\t"

  49. 	    "xchgl	(%0), %%eax\n\t"

  50. 	    "xchgl	4(%0), %%edx\n\t"

  51. 	    "xchgl	8(%0), %%ecx\n\t"

  52. 	    "movl	%%eax, (%1)\n\t"

  53. 	    "movl	%%edx, 4(%1)\n\t"

  54. 	    "movl	%%ecx, 8(%1)\n\t"

  55. 	    "movl	%%eax, (%2)\n\t"

  56. 	    "movl	%%edx, 4(%2)\n\t"

  57. 	    "movl	%%ecx, 8(%2)\n\t"

  58. 	    :

  59. 	    :"r"(s->last_picture), "r"(s->next_picture), "r"(s->current_picture)

  60. 	    :"eax","edx","ecx","memory");

  61.     }

  62. }

  63. #endif

  64. 

  65. static const unsigned long long int mm_wabs __attribute__ ((aligned(8))) = 0xffffffffffffffffULL;

  66. static const unsigned long long int mm_wone __attribute__ ((aligned(8))) = 0x0001000100010001ULL;

  67. 

  68. /*

  69.   NK:

  70.   Note: looking at PARANOID:

  71.   "enable all paranoid tests for rounding, overflows, etc..."

  72. 

  73. #ifdef PARANOID

  74.                 if (level < -2048 || level > 2047)

  75.                     fprintf(stderr, "unquant error %d %d\n", i, level);

  76. #endif

  77.   We can suppose that result of two multiplications can't be greate of 0xFFFF

  78.   i.e. is 16-bit, so we use here only PMULLW instruction and can avoid

  79.   a complex multiplication.

  80. =====================================================

  81.  Full formula for multiplication of 2 integer numbers

  82.  which are represent as high:low words:

  83.  input: value1 = high1:low1

  84.         value2 = high2:low2

  85.  output: value3 = value1*value2

  86.  value3=high3:low3 (on overflow: modulus 2^32 wrap-around)

  87.  this mean that for 0x123456 * 0x123456 correct result is 0x766cb0ce4

  88.  but this algorithm will compute only 0x66cb0ce4

  89.  this limited by 16-bit size of operands

  90.  ---------------------------------

  91.  tlow1 = high1*low2

  92.  tlow2 = high2*low1

  93.  tlow1 = tlow1 + tlow2

  94.  high3:low3 = low1*low2

  95.  high3 += tlow1

  96. */

  97. static void dct_unquantize_mpeg1_mmx(MpegEncContext *s,

  98.                                      DCTELEM *block, int n, int qscale)

  99. {

  100.     int i, level;

  101.     const UINT16 *quant_matrix;

  102.     if (s->mb_intra) {

  103.         if (n < 4) 

  104.             block[0] = block[0] * s->y_dc_scale;

  105.         else

  106.             block[0] = block[0] * s->c_dc_scale;

  107.         if (s->out_format == FMT_H263) {

  108.             i = 1;

  109.             goto unquant_even;

  110.         }

  111.         /* XXX: only mpeg1 */

  112.         quant_matrix = s->intra_matrix;

  113. 	i=1;

  114. 	/* Align on 4 elements boundary */

  115. 	while(i&3)

  116. 	{

  117.             level = block[i];

  118.             if (level) {

  119.                 if (level < 0) level = -level;

  120.                     level = (int)(level * qscale * quant_matrix[i]) >> 3;

  121.                     level = (level - 1) | 1;

  122.                 if (block[i] < 0) level = -level;

  123.                 block[i] = level;

  124.             }

  125. 	    i++;

  126. 	}

  127. 	__asm __volatile(

  128. 	"movd	%0, %%mm6\n\t"       /* mm6 = qscale | 0  */

  129. 	"punpckldq %%mm6, %%mm6\n\t" /* mm6 = qscale | qscale */

  130. 	"movq	%2, %%mm4\n\t"

  131. 	"movq	%%mm6, %%mm7\n\t"

  132. 	"movq	%1, %%mm5\n\t"

  133. 	"packssdw %%mm6, %%mm7\n\t" /* mm7 = qscale | qscale | qscale | qscale */

  134. 	"pxor	%%mm6, %%mm6\n\t"

  135. 	::"g"(qscale),"m"(mm_wone),"m"(mm_wabs):"memory");

  136.         for(;i<64;i+=4) {

  137. 		__asm __volatile(

  138. 			"movq	%1, %%mm0\n\t"

  139. 			"movq	%%mm7, %%mm1\n\t"

  140. 			"movq	%%mm0, %%mm2\n\t"

  141. 			"movq	%%mm0, %%mm3\n\t"

  142. 			"pcmpgtw %%mm6, %%mm2\n\t"

  143. 			"pmullw	%2, %%mm1\n\t"

  144. 			"pandn	%%mm4, %%mm2\n\t"

  145. 			"por	%%mm5, %%mm2\n\t"  

  146. 			"pmullw	%%mm2, %%mm0\n\t" /* mm0 = abs(block[i]). */

  147. 			

  148. 			"pcmpeqw %%mm6, %%mm3\n\t"

  149. 			"pmullw	%%mm0, %%mm1\n\t"

  150. 			"psraw	$3, %%mm1\n\t"

  151. 			"psubw	%%mm5, %%mm1\n\t"   /* block[i] --; */

  152. 			"pandn	%%mm4, %%mm3\n\t"  /* fake of pcmpneqw : mm0 != 0 then mm1 = -1 */

  153. 			"por	%%mm5, %%mm1\n\t"   /* block[i] |= 1 */

  154. 			"pmullw %%mm2, %%mm1\n\t"   /* change signs again */

  155. 

  156. 			"pand	%%mm3, %%mm1\n\t" /* nullify if was zero */

  157. 			"movq	%%mm1, %0"

  158. 			:"=m"(block[i])

  159. 			:"m"(block[i]), "m"(quant_matrix[i])

  160. 			:"memory");

  161.         }

  162.     } else {

  163.         i = 0;

  164.     unquant_even:

  165.         quant_matrix = s->non_intra_matrix;

  166. 	/* Align on 4 elements boundary */

  167. 	while(i&3)

  168. 	{

  169. 	    level = block[i];

  170.             if (level) {

  171.                 if (level < 0) level = -level;

  172.                     level = (((level << 1) + 1) * qscale *

  173.                              ((int) quant_matrix[i])) >> 4;

  174.                     level = (level - 1) | 1;

  175.                 if(block[i] < 0) level = -level;

  176.                 block[i] = level;

  177. 	    }

  178. 	    i++;

  179. 	}

  180. 	__asm __volatile(

  181. 	"movd	%0, %%mm6\n\t"       /* mm6 = qscale | 0  */

  182. 	"punpckldq %%mm6, %%mm6\n\t" /* mm6 = qscale | qscale */

  183. 	"movq	%2, %%mm4\n\t"

  184. 	"movq	%%mm6, %%mm7\n\t"

  185. 	"movq	%1, %%mm5\n\t"

  186. 	"packssdw %%mm6, %%mm7\n\t" /* mm7 = qscale | qscale | qscale | qscale */

  187. 	"pxor	%%mm6, %%mm6\n\t"

  188. 	::"g"(qscale),"m"(mm_wone),"m"(mm_wabs):"memory");

  189.         for(;i<64;i+=4) {

  190. 		__asm __volatile(

  191. 			"movq	%1, %%mm0\n\t"

  192. 			"movq	%%mm7, %%mm1\n\t"

  193. 			"movq	%%mm0, %%mm2\n\t"

  194. 			"movq	%%mm0, %%mm3\n\t"

  195. 			"pcmpgtw %%mm6, %%mm2\n\t"

  196. 			"pmullw	%2, %%mm1\n\t"

  197. 			"pandn	%%mm4, %%mm2\n\t"

  198. 			"por	%%mm5, %%mm2\n\t"  

  199. 			"pmullw	%%mm2, %%mm0\n\t" /* mm0 = abs(block[i]). */

  200. 			"psllw	$1, %%mm0\n\t" /* block[i] <<= 1 */

  201. 			"paddw	%%mm5, %%mm0\n\t" /* block[i] ++ */

  202. 			

  203. 			"pmullw	%%mm0, %%mm1\n\t"

  204. 			"psraw	$4, %%mm1\n\t"

  205. 			"pcmpeqw %%mm6, %%mm3\n\t"

  206. 			"psubw	%%mm5, %%mm1\n\t"   /* block[i] --; */

  207. 			"pandn	%%mm4, %%mm3\n\t"  /* fake of pcmpneqw : mm0 != 0 then mm1 = -1 */

  208. 			"por	%%mm5, %%mm1\n\t"   /* block[i] |= 1 */

  209. 			"pmullw %%mm2, %%mm1\n\t"   /* change signs again */

  210. 

  211. 			"pand	%%mm3, %%mm1\n\t" /* nullify if was zero */

  212. 			"movq	%%mm1, %0"

  213. 			:"=m"(block[i])

  214. 			:"m"(block[i]), "m"(quant_matrix[i])

  215. 			:"memory");

  216.         }

  217.     }

  218. }

  219. 

  220. void MPV_common_init_mmx(MpegEncContext *s)

  221. {

  222.     if (mm_flags & MM_MMX) {

  223.         /* XXX: should include h263 optimization too. It would go even

  224.            faster! */

  225.         s->dct_unquantize = dct_unquantize_mpeg1_mmx;

  226.     }

  227. }