swscale_template.c

ffmpeg的完整源代码和作者自己写的文档。不但有在Linux的工程哦

/*
 * Copyright (C) 2001-2003 Michael Niedermayer <[e-mail]>
 *
 * This file is part of FFmpeg.
 *
 * FFmpeg 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.
 *
 * FFmpeg 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 FFmpeg; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
 *
 * the C code (not assembly, mmx, ...) of this file can be used
 * under the LGPL license too
 */

#undef REAL_MOVNTQ
#undef MOVNTQ
#undef PAVGB
#undef PREFETCH
#undef PREFETCHW
#undef EMMS
#undef SFENCE

#ifdef HAVE_3DNOW
/* On K6 femms is faster of emms. On K7 femms is directly mapped on emms. */
#define EMMS     "femms"
#else
#define EMMS     "emms"
#endif

#ifdef HAVE_3DNOW
#define PREFETCH  "prefetch"
#define PREFETCHW "prefetchw"
#elif defined ( HAVE_MMX2 )
#define PREFETCH "prefetchnta"
#define PREFETCHW "prefetcht0"
#else
#define PREFETCH  " # nop"
#define PREFETCHW " # nop"
#endif

#ifdef HAVE_MMX2
#define SFENCE "sfence"
#else
#define SFENCE " # nop"
#endif

#ifdef HAVE_MMX2
#define PAVGB(a,b) "pavgb " #a ", " #b " \n\t"
#elif defined (HAVE_3DNOW)
#define PAVGB(a,b) "pavgusb " #a ", " #b " \n\t"
#endif

#ifdef HAVE_MMX2
#define REAL_MOVNTQ(a,b) "movntq " #a ", " #b " \n\t"
#else
#define REAL_MOVNTQ(a,b) "movq " #a ", " #b " \n\t"
#endif
#define MOVNTQ(a,b)  REAL_MOVNTQ(a,b)

#ifdef HAVE_ALTIVEC
#include "swscale_altivec_template.c"
#endif

#define YSCALEYUV2YV12X(x, offset, dest, width) \
    asm volatile(\
    "xor                          %%"REG_a", %%"REG_a"  \n\t"\
    "movq             "VROUNDER_OFFSET"(%0), %%mm3      \n\t"\
    "movq                             %%mm3, %%mm4      \n\t"\
    "lea                     " offset "(%0), %%"REG_d"  \n\t"\
    "mov                        (%%"REG_d"), %%"REG_S"  \n\t"\
    ASMALIGN(4) /* FIXME Unroll? */\
    "1:                                                 \n\t"\
    "movq                      8(%%"REG_d"), %%mm0      \n\t" /* filterCoeff */\
    "movq   " #x "(%%"REG_S", %%"REG_a", 2), %%mm2      \n\t" /* srcData */\
    "movq 8+" #x "(%%"REG_S", %%"REG_a", 2), %%mm5      \n\t" /* srcData */\
    "add                                $16, %%"REG_d"  \n\t"\
    "mov                        (%%"REG_d"), %%"REG_S"  \n\t"\
    "test                         %%"REG_S", %%"REG_S"  \n\t"\
    "pmulhw                           %%mm0, %%mm2      \n\t"\
    "pmulhw                           %%mm0, %%mm5      \n\t"\
    "paddw                            %%mm2, %%mm3      \n\t"\
    "paddw                            %%mm5, %%mm4      \n\t"\
    " jnz                                1b             \n\t"\
    "psraw                               $3, %%mm3      \n\t"\
    "psraw                               $3, %%mm4      \n\t"\
    "packuswb                         %%mm4, %%mm3      \n\t"\
    MOVNTQ(%%mm3, (%1, %%REGa))\
    "add                                 $8, %%"REG_a"  \n\t"\
    "cmp                                 %2, %%"REG_a"  \n\t"\
    "movq             "VROUNDER_OFFSET"(%0), %%mm3      \n\t"\
    "movq                             %%mm3, %%mm4      \n\t"\
    "lea                     " offset "(%0), %%"REG_d"  \n\t"\
    "mov                        (%%"REG_d"), %%"REG_S"  \n\t"\
    "jb                                  1b             \n\t"\
    :: "r" (&c->redDither),\
    "r" (dest), "g" (width)\
    : "%"REG_a, "%"REG_d, "%"REG_S\
    );

#define YSCALEYUV2YV12X_ACCURATE(x, offset, dest, width) \
    asm volatile(\
    "lea                     " offset "(%0), %%"REG_d"  \n\t"\
    "xor                          %%"REG_a", %%"REG_a"  \n\t"\
    "pxor                             %%mm4, %%mm4      \n\t"\
    "pxor                             %%mm5, %%mm5      \n\t"\
    "pxor                             %%mm6, %%mm6      \n\t"\
    "pxor                             %%mm7, %%mm7      \n\t"\
    "mov                        (%%"REG_d"), %%"REG_S"  \n\t"\
    ASMALIGN(4) \
    "1:                                                 \n\t"\
    "movq   " #x "(%%"REG_S", %%"REG_a", 2), %%mm0      \n\t" /* srcData */\
    "movq 8+" #x "(%%"REG_S", %%"REG_a", 2), %%mm2      \n\t" /* srcData */\
    "mov                       4(%%"REG_d"), %%"REG_S"  \n\t"\
    "movq   " #x "(%%"REG_S", %%"REG_a", 2), %%mm1      \n\t" /* srcData */\
    "movq                             %%mm0, %%mm3      \n\t"\
    "punpcklwd                        %%mm1, %%mm0      \n\t"\
    "punpckhwd                        %%mm1, %%mm3      \n\t"\
    "movq                      8(%%"REG_d"), %%mm1      \n\t" /* filterCoeff */\
    "pmaddwd                          %%mm1, %%mm0      \n\t"\
    "pmaddwd                          %%mm1, %%mm3      \n\t"\
    "paddd                            %%mm0, %%mm4      \n\t"\
    "paddd                            %%mm3, %%mm5      \n\t"\
    "movq 8+" #x "(%%"REG_S", %%"REG_a", 2), %%mm3      \n\t" /* srcData */\
    "mov                      16(%%"REG_d"), %%"REG_S"  \n\t"\
    "add                                $16, %%"REG_d"  \n\t"\
    "test                         %%"REG_S", %%"REG_S"  \n\t"\
    "movq                             %%mm2, %%mm0      \n\t"\
    "punpcklwd                        %%mm3, %%mm2      \n\t"\
    "punpckhwd                        %%mm3, %%mm0      \n\t"\
    "pmaddwd                          %%mm1, %%mm2      \n\t"\
    "pmaddwd                          %%mm1, %%mm0      \n\t"\
    "paddd                            %%mm2, %%mm6      \n\t"\
    "paddd                            %%mm0, %%mm7      \n\t"\
    " jnz                                1b             \n\t"\
    "psrad                              $16, %%mm4      \n\t"\
    "psrad                              $16, %%mm5      \n\t"\
    "psrad                              $16, %%mm6      \n\t"\
    "psrad                              $16, %%mm7      \n\t"\
    "movq             "VROUNDER_OFFSET"(%0), %%mm0      \n\t"\
    "packssdw                         %%mm5, %%mm4      \n\t"\
    "packssdw                         %%mm7, %%mm6      \n\t"\
    "paddw                            %%mm0, %%mm4      \n\t"\
    "paddw                            %%mm0, %%mm6      \n\t"\
    "psraw                               $3, %%mm4      \n\t"\
    "psraw                               $3, %%mm6      \n\t"\
    "packuswb                         %%mm6, %%mm4      \n\t"\
    MOVNTQ(%%mm4, (%1, %%REGa))\
    "add                                 $8, %%"REG_a"  \n\t"\
    "cmp                                 %2, %%"REG_a"  \n\t"\
    "lea                     " offset "(%0), %%"REG_d"  \n\t"\
    "pxor                             %%mm4, %%mm4      \n\t"\
    "pxor                             %%mm5, %%mm5      \n\t"\
    "pxor                             %%mm6, %%mm6      \n\t"\
    "pxor                             %%mm7, %%mm7      \n\t"\
    "mov                        (%%"REG_d"), %%"REG_S"  \n\t"\
    "jb                                  1b             \n\t"\
    :: "r" (&c->redDither),\
    "r" (dest), "g" (width)\
    : "%"REG_a, "%"REG_d, "%"REG_S\
    );

#define YSCALEYUV2YV121 \
    "mov %2, %%"REG_a"                    \n\t"\
    ASMALIGN(4) /* FIXME Unroll? */\
    "1:                                   \n\t"\
    "movq  (%0, %%"REG_a", 2), %%mm0      \n\t"\
    "movq 8(%0, %%"REG_a", 2), %%mm1      \n\t"\
    "psraw                 $7, %%mm0      \n\t"\
    "psraw                 $7, %%mm1      \n\t"\
    "packuswb           %%mm1, %%mm0      \n\t"\
    MOVNTQ(%%mm0, (%1, %%REGa))\
    "add                   $8, %%"REG_a"  \n\t"\
    "jnc                   1b             \n\t"

/*
    :: "m" (-lumFilterSize), "m" (-chrFilterSize),
       "m" (lumMmxFilter+lumFilterSize*4), "m" (chrMmxFilter+chrFilterSize*4),
       "r" (dest), "m" (dstW),
       "m" (lumSrc+lumFilterSize), "m" (chrSrc+chrFilterSize)
    : "%eax", "%ebx", "%ecx", "%edx", "%esi"
*/
#define YSCALEYUV2PACKEDX \
    asm volatile(\
    "xor                   %%"REG_a", %%"REG_a"     \n\t"\
    ASMALIGN(4)\
    "nop                                            \n\t"\
    "1:                                             \n\t"\
    "lea "CHR_MMX_FILTER_OFFSET"(%0), %%"REG_d"     \n\t"\
    "mov                 (%%"REG_d"), %%"REG_S"     \n\t"\
    "movq      "VROUNDER_OFFSET"(%0), %%mm3         \n\t"\
    "movq                      %%mm3, %%mm4         \n\t"\
    ASMALIGN(4)\
    "2:                                             \n\t"\
    "movq               8(%%"REG_d"), %%mm0         \n\t" /* filterCoeff */\
    "movq     (%%"REG_S", %%"REG_a"), %%mm2         \n\t" /* UsrcData */\
    "movq 4096(%%"REG_S", %%"REG_a"), %%mm5         \n\t" /* VsrcData */\
    "add                         $16, %%"REG_d"     \n\t"\
    "mov                 (%%"REG_d"), %%"REG_S"     \n\t"\
    "pmulhw                    %%mm0, %%mm2         \n\t"\
    "pmulhw                    %%mm0, %%mm5         \n\t"\
    "paddw                     %%mm2, %%mm3         \n\t"\
    "paddw                     %%mm5, %%mm4         \n\t"\
    "test                  %%"REG_S", %%"REG_S"     \n\t"\
    " jnz                         2b                \n\t"\
\
    "lea "LUM_MMX_FILTER_OFFSET"(%0), %%"REG_d"     \n\t"\
    "mov                 (%%"REG_d"), %%"REG_S"     \n\t"\
    "movq      "VROUNDER_OFFSET"(%0), %%mm1         \n\t"\
    "movq                      %%mm1, %%mm7         \n\t"\
    ASMALIGN(4)\
    "2:                                             \n\t"\
    "movq               8(%%"REG_d"), %%mm0         \n\t" /* filterCoeff */\
    "movq  (%%"REG_S", %%"REG_a", 2), %%mm2         \n\t" /* Y1srcData */\
    "movq 8(%%"REG_S", %%"REG_a", 2), %%mm5         \n\t" /* Y2srcData */\
    "add                         $16, %%"REG_d"            \n\t"\
    "mov                 (%%"REG_d"), %%"REG_S"     \n\t"\
    "pmulhw                    %%mm0, %%mm2         \n\t"\
    "pmulhw                    %%mm0, %%mm5         \n\t"\
    "paddw                     %%mm2, %%mm1         \n\t"\
    "paddw                     %%mm5, %%mm7         \n\t"\
    "test                  %%"REG_S", %%"REG_S"     \n\t"\
    " jnz                         2b                \n\t"\

#define YSCALEYUV2PACKEDX_END                 \
    :: "r" (&c->redDither),                   \
        "m" (dummy), "m" (dummy), "m" (dummy),\
        "r" (dest), "m" (dstW)                \
    : "%"REG_a, "%"REG_d, "%"REG_S            \
    );

#define YSCALEYUV2PACKEDX_ACCURATE \
    asm volatile(\
    "xor %%"REG_a", %%"REG_a"                       \n\t"\
    ASMALIGN(4)\
    "nop                                            \n\t"\
    "1:                                             \n\t"\
    "lea "CHR_MMX_FILTER_OFFSET"(%0), %%"REG_d"     \n\t"\
    "mov                 (%%"REG_d"), %%"REG_S"     \n\t"\
    "pxor                      %%mm4, %%mm4         \n\t"\
    "pxor                      %%mm5, %%mm5         \n\t"\
    "pxor                      %%mm6, %%mm6         \n\t"\
    "pxor                      %%mm7, %%mm7         \n\t"\
    ASMALIGN(4)\
    "2:                                             \n\t"\
    "movq     (%%"REG_S", %%"REG_a"), %%mm0         \n\t" /* UsrcData */\
    "movq 4096(%%"REG_S", %%"REG_a"), %%mm2         \n\t" /* VsrcData */\
    "mov                4(%%"REG_d"), %%"REG_S"     \n\t"\
    "movq     (%%"REG_S", %%"REG_a"), %%mm1         \n\t" /* UsrcData */\
    "movq                      %%mm0, %%mm3         \n\t"\
    "punpcklwd                 %%mm1, %%mm0         \n\t"\
    "punpckhwd                 %%mm1, %%mm3         \n\t"\
    "movq               8(%%"REG_d"), %%mm1         \n\t" /* filterCoeff */\
    "pmaddwd                   %%mm1, %%mm0         \n\t"\
    "pmaddwd                   %%mm1, %%mm3         \n\t"\
    "paddd                     %%mm0, %%mm4         \n\t"\
    "paddd                     %%mm3, %%mm5         \n\t"\
    "movq 4096(%%"REG_S", %%"REG_a"), %%mm3         \n\t" /* VsrcData */\
    "mov               16(%%"REG_d"), %%"REG_S"     \n\t"\
    "add                         $16, %%"REG_d"     \n\t"\
    "test                  %%"REG_S", %%"REG_S"     \n\t"\
    "movq                      %%mm2, %%mm0         \n\t"\
    "punpcklwd                 %%mm3, %%mm2         \n\t"\
    "punpckhwd                 %%mm3, %%mm0         \n\t"\
    "pmaddwd                   %%mm1, %%mm2         \n\t"\
    "pmaddwd                   %%mm1, %%mm0         \n\t"\
    "paddd                     %%mm2, %%mm6         \n\t"\
    "paddd                     %%mm0, %%mm7         \n\t"\
    " jnz                         2b                \n\t"\
    "psrad                       $16, %%mm4         \n\t"\
    "psrad                       $16, %%mm5         \n\t"\
    "psrad                       $16, %%mm6         \n\t"\
    "psrad                       $16, %%mm7         \n\t"\
    "movq      "VROUNDER_OFFSET"(%0), %%mm0         \n\t"\
    "packssdw                  %%mm5, %%mm4         \n\t"\
    "packssdw                  %%mm7, %%mm6         \n\t"\
    "paddw                     %%mm0, %%mm4         \n\t"\
    "paddw                     %%mm0, %%mm6         \n\t"\
    "movq                      %%mm4, "U_TEMP"(%0)  \n\t"\
    "movq                      %%mm6, "V_TEMP"(%0)  \n\t"\
\