vlc-0.8.4a: /home/huihoo/src/vlc/vlc-0.8.4a/modules/video_chroma/i420

00001 /*****************************************************************************
00002  * i420_rgb16.c : YUV to bitmap RGB conversion module for vlc
00003  *****************************************************************************
00004  * Copyright (C) 2000 the VideoLAN team
00005  * $Id: i420_rgb16.c 12684 2005-09-26 10:15:02Z sam $
00006  *
00007  * Authors: Samuel Hocevar <[email protected]>
00008  *
00009  * This program is free software; you can redistribute it and/or modify
00010  * it under the terms of the GNU General Public License as published by
00011  * the Free Software Foundation; either version 2 of the License, or
00012  * (at your option) any later version.
00013  * 
00014  * This program is distributed in the hope that it will be useful,
00015  * but WITHOUT ANY WARRANTY; without even the implied warranty of
00016  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
00017  * GNU General Public License for more details.
00018  *
00019  * You should have received a copy of the GNU General Public License
00020  * along with this program; if not, write to the Free Software
00021  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111, USA.
00022  *****************************************************************************/
00023 
00024 /*****************************************************************************
00025  * Preamble
00026  *****************************************************************************/
00027 #include <string.h>                                            /* strerror() */
00028 #include <stdlib.h>                                      /* malloc(), free() */
00029 
00030 #include <vlc/vlc.h>
00031 #include <vlc/vout.h>
00032 
00033 #include "i420_rgb.h"
00034 #if defined (MODULE_NAME_IS_i420_rgb)
00035 #   include "i420_rgb_c.h"
00036 #elif defined (MODULE_NAME_IS_i420_rgb_mmx)
00037 #   if defined(HAVE_MMX_INTRINSICS)
00038 #       include <mmintrin.h>
00039 #   endif
00040 #   include "i420_rgb_mmx.h"
00041 #endif
00042 
00043 static void SetOffset( int, int, int, int, vlc_bool_t *,
00044                        unsigned int *, int * );
00045 
00046 #if defined (MODULE_NAME_IS_i420_rgb)
00047 /*****************************************************************************
00048  * I420_RGB16: color YUV 4:2:0 to RGB 16 bpp with dithering
00049  *****************************************************************************
00050  * Horizontal alignment needed:
00051  *  - input: 8 pixels (8 Y bytes, 4 U/V bytes), margins not allowed
00052  *  - output: 1 pixel (2 bytes), margins allowed
00053  * Vertical alignment needed:
00054  *  - input: 2 lines (2 Y lines, 1 U/V line)
00055  *  - output: 1 line
00056  *****************************************************************************/
00057 void E_(I420_RGB16_dithering)( vout_thread_t *p_vout, picture_t *p_src,
00058                                                       picture_t *p_dest )
00059 {
00060     /* We got this one from the old arguments */
00061     uint16_t *p_pic = (uint16_t*)p_dest->p->p_pixels;
00062     uint8_t  *p_y   = p_src->Y_PIXELS;
00063     uint8_t  *p_u   = p_src->U_PIXELS;
00064     uint8_t  *p_v   = p_src->V_PIXELS;
00065 
00066     vlc_bool_t   b_hscale;                        /* horizontal scaling type */
00067     unsigned int i_vscale;                          /* vertical scaling type */
00068     unsigned int i_x, i_y;                /* horizontal and vertical indexes */
00069     unsigned int i_real_y;                                          /* y % 4 */
00070 
00071     int         i_right_margin;
00072     int         i_rewind;
00073     int         i_scale_count;                       /* scale modulo counter */
00074     int         i_chroma_width = p_vout->render.i_width / 2; /* chroma width */
00075     uint16_t *  p_pic_start;       /* beginning of the current line for copy */
00076     int         i_uval, i_vval;                           /* U and V samples */
00077     int         i_red, i_green, i_blue;          /* U and V modified samples */
00078     uint16_t *  p_yuv = p_vout->chroma.p_sys->p_rgb16;
00079     uint16_t *  p_ybase;                     /* Y dependant conversion table */
00080 
00081     /* Conversion buffer pointer */
00082     uint16_t *  p_buffer_start = (uint16_t*)p_vout->chroma.p_sys->p_buffer;
00083     uint16_t *  p_buffer;
00084 
00085     /* Offset array pointer */
00086     int *       p_offset_start = p_vout->chroma.p_sys->p_offset;
00087     int *       p_offset;
00088 
00089     const int i_source_margin = p_src->p[0].i_pitch
00090                                  - p_src->p[0].i_visible_pitch;
00091     const int i_source_margin_c = p_src->p[1].i_pitch
00092                                  - p_src->p[1].i_visible_pitch;
00093 
00094     /* The dithering matrices */
00095     int dither10[4] = {  0x0,  0x8,  0x2,  0xa };
00096     int dither11[4] = {  0xc,  0x4,  0xe,  0x6 };
00097     int dither12[4] = {  0x3,  0xb,  0x1,  0x9 };
00098     int dither13[4] = {  0xf,  0x7,  0xd,  0x5 };
00099 
00100     for(i_x = 0; i_x < 4; i_x++)
00101     {
00102         dither10[i_x] = dither10[i_x] << (SHIFT - 4 + p_vout->output.i_rrshift);
00103         dither11[i_x] = dither11[i_x] << (SHIFT - 4 + p_vout->output.i_rrshift);
00104         dither12[i_x] = dither12[i_x] << (SHIFT - 4 + p_vout->output.i_rrshift);
00105         dither13[i_x] = dither13[i_x] << (SHIFT - 4 + p_vout->output.i_rrshift);
00106     }
00107 
00108     i_right_margin = p_dest->p->i_pitch - p_dest->p->i_visible_pitch;
00109 
00110     if( p_vout->render.i_width & 7 )
00111     {
00112         i_rewind = 8 - ( p_vout->render.i_width & 7 );
00113     }
00114     else
00115     {
00116         i_rewind = 0;
00117     }
00118 
00119     /* Rule: when a picture of size (x1,y1) with aspect ratio r1 is rendered
00120      * on a picture of size (x2,y2) with aspect ratio r2, if x1 grows to x1'
00121      * then y1 grows to y1' = x1' * y2/x2 * r2/r1 */
00122     SetOffset( p_vout->render.i_width, p_vout->render.i_height,
00123                p_vout->output.i_width, p_vout->output.i_height,
00124                &b_hscale, &i_vscale, p_offset_start );
00125 
00126     /*
00127      * Perform conversion
00128      */
00129     i_scale_count = ( i_vscale == 1 ) ?
00130                     p_vout->output.i_height : p_vout->render.i_height;
00131     for( i_y = 0; i_y < p_vout->render.i_height; i_y++ )
00132     {
00133         i_real_y = i_y & 0x3;
00134         p_pic_start = p_pic;
00135         p_buffer = b_hscale ? p_buffer_start : p_pic;
00136 
00137         for ( i_x = p_vout->render.i_width / 8; i_x--; )
00138         {
00139             int *p_dither = dither10;
00140             CONVERT_YUV_PIXEL_DITHER(2);
00141             p_dither = dither11;
00142             CONVERT_Y_PIXEL_DITHER(2);
00143             p_dither = dither12;
00144             CONVERT_YUV_PIXEL_DITHER(2);
00145             p_dither = dither13;
00146             CONVERT_Y_PIXEL_DITHER(2);
00147             p_dither = dither10;
00148             CONVERT_YUV_PIXEL_DITHER(2);
00149             p_dither = dither11;
00150             CONVERT_Y_PIXEL_DITHER(2);
00151             p_dither = dither12;
00152             CONVERT_YUV_PIXEL_DITHER(2);
00153             p_dither = dither13;
00154             CONVERT_Y_PIXEL_DITHER(2);
00155         }
00156 
00157         /* Here we do some unaligned reads and duplicate conversions, but
00158          * at least we have all the pixels */
00159         if( i_rewind )
00160         {
00161             int *p_dither = dither10;
00162             p_y -= i_rewind;
00163             p_u -= i_rewind >> 1;
00164             p_v -= i_rewind >> 1;
00165             p_buffer -= i_rewind;
00166             CONVERT_YUV_PIXEL_DITHER(2);
00167             p_dither = dither11;
00168             CONVERT_Y_PIXEL_DITHER(2);
00169             p_dither = dither12;
00170             CONVERT_YUV_PIXEL_DITHER(2);
00171             p_dither = dither13;
00172             CONVERT_Y_PIXEL_DITHER(2);
00173             p_dither = dither10;
00174             CONVERT_YUV_PIXEL_DITHER(2);
00175             p_dither = dither11;
00176             CONVERT_Y_PIXEL_DITHER(2);
00177             p_dither = dither12;
00178             CONVERT_YUV_PIXEL_DITHER(2);
00179             p_dither = dither13;
00180             CONVERT_Y_PIXEL_DITHER(2);
00181         }
00182         SCALE_WIDTH;
00183         SCALE_HEIGHT( 420, 2 );
00184 
00185         p_y += i_source_margin;
00186         if( i_y % 2 )
00187         {
00188             p_u += i_source_margin_c;
00189             p_v += i_source_margin_c;
00190         }
00191     }
00192 }
00193 #endif
00194 
00195 /*****************************************************************************
00196  * I420_RGB16: color YUV 4:2:0 to RGB 16 bpp
00197  *****************************************************************************
00198  * Horizontal alignment needed:
00199  *  - input: 8 pixels (8 Y bytes, 4 U/V bytes), margins not allowed
00200  *  - output: 1 pixel (2 bytes), margins allowed
00201  * Vertical alignment needed:
00202  *  - input: 2 lines (2 Y lines, 1 U/V line)
00203  *  - output: 1 line
00204  *****************************************************************************/
00205 void E_(I420_RGB16)( vout_thread_t *p_vout, picture_t *p_src,
00206                                             picture_t *p_dest )
00207 {
00208     /* We got this one from the old arguments */
00209     uint16_t *p_pic = (uint16_t*)p_dest->p->p_pixels;
00210     uint8_t  *p_y   = p_src->Y_PIXELS;
00211     uint8_t  *p_u   = p_src->U_PIXELS;
00212     uint8_t  *p_v   = p_src->V_PIXELS;
00213 
00214     vlc_bool_t  b_hscale;                         /* horizontal scaling type */
00215     unsigned int i_vscale;                          /* vertical scaling type */
00216     unsigned int i_x, i_y;                /* horizontal and vertical indexes */
00217 
00218     int         i_right_margin;
00219     int         i_rewind;
00220     int         i_scale_count;                       /* scale modulo counter */
00221     int         i_chroma_width = p_vout->render.i_width / 2; /* chroma width */
00222     uint16_t *  p_pic_start;       /* beginning of the current line for copy */
00223 #if defined (MODULE_NAME_IS_i420_rgb)
00224     int         i_uval, i_vval;                           /* U and V samples */
00225     int         i_red, i_green, i_blue;          /* U and V modified samples */
00226     uint16_t *  p_yuv = p_vout->chroma.p_sys->p_rgb16;
00227     uint16_t *  p_ybase;                     /* Y dependant conversion table */
00228 #endif
00229 
00230     /* Conversion buffer pointer */
00231     uint16_t *  p_buffer_start = (uint16_t*)p_vout->chroma.p_sys->p_buffer;
00232     uint16_t *  p_buffer;
00233 
00234     /* Offset array pointer */
00235     int *       p_offset_start = p_vout->chroma.p_sys->p_offset;
00236     int *       p_offset;
00237 
00238     const int i_source_margin = p_src->p[0].i_pitch
00239                                  - p_src->p[0].i_visible_pitch;
00240     const int i_source_margin_c = p_src->p[1].i_pitch
00241                                  - p_src->p[1].i_visible_pitch;
00242 
00243     i_right_margin = p_dest->p->i_pitch - p_dest->p->i_visible_pitch;
00244 
00245     if( p_vout->render.i_width & 7 )
00246     {
00247         i_rewind = 8 - ( p_vout->render.i_width & 7 );
00248     }
00249     else
00250     {
00251         i_rewind = 0;
00252     }
00253 
00254     /* Rule: when a picture of size (x1,y1) with aspect ratio r1 is rendered
00255      * on a picture of size (x2,y2) with aspect ratio r2, if x1 grows to x1'
00256      * then y1 grows to y1' = x1' * y2/x2 * r2/r1 */
00257     SetOffset( p_vout->render.i_width, p_vout->render.i_height,
00258                p_vout->output.i_width, p_vout->output.i_height,
00259                &b_hscale, &i_vscale, p_offset_start );
00260 
00261     /*
00262      * Perform conversion
00263      */
00264     i_scale_count = ( i_vscale == 1 ) ?
00265                     p_vout->output.i_height : p_vout->render.i_height;
00266     for( i_y = 0; i_y < p_vout->render.i_height; i_y++ )
00267     {
00268         p_pic_start = p_pic;
00269         p_buffer = b_hscale ? p_buffer_start : p_pic;
00270 
00271 #if defined (MODULE_NAME_IS_i420_rgb)
00272         for ( i_x = p_vout->render.i_width / 8; i_x--; )
00273         {
00274             CONVERT_YUV_PIXEL(2);  CONVERT_Y_PIXEL(2);
00275             CONVERT_YUV_PIXEL(2);  CONVERT_Y_PIXEL(2);
00276             CONVERT_YUV_PIXEL(2);  CONVERT_Y_PIXEL(2);
00277             CONVERT_YUV_PIXEL(2);  CONVERT_Y_PIXEL(2);
00278         }
00279 #elif defined (MODULE_NAME_IS_i420_rgb_mmx)
00280         if( p_vout->output.i_rmask == 0x7c00 )
00281         {
00282             /* 15bpp 5/5/5 */
00283             for ( i_x = p_vout->render.i_width / 8; i_x--; )
00284             {
00285 #   if defined (HAVE_MMX_INTRINSICS)
00286                 __m64 mm0, mm1, mm2, mm3, mm4, mm5, mm6, mm7;
00287                 uint64_t tmp64;
00288                 INTRINSICS_INIT_16
00289                 INTRINSICS_YUV_MUL
00290                 INTRINSICS_YUV_ADD
00291                 INTRINSICS_UNPACK_15
00292 #   else
00293                 __asm__( MMX_INIT_16
00294                          : : "r" (p_y), "r" (p_u), "r" (p_v), "r" (p_buffer) );
00295 
00296                 __asm__( ".align 8"
00297                          MMX_YUV_MUL
00298                          MMX_YUV_ADD
00299                          MMX_UNPACK_15
00300                          : : "r" (p_y), "r" (p_u), "r" (p_v), "r" (p_buffer) );
00301 #   endif
00302 
00303                 p_y += 8;
00304                 p_u += 4;
00305                 p_v += 4;
00306                 p_buffer += 8;
00307             }
00308         }
00309         else
00310         {
00311             /* 16bpp 5/6/5 */
00312             for ( i_x = p_vout->render.i_width / 8; i_x--; )
00313             {
00314 #   if defined (HAVE_MMX_INTRINSICS)
00315                 __m64 mm0, mm1, mm2, mm3, mm4, mm5, mm6, mm7;
00316                 uint64_t tmp64;
00317                 INTRINSICS_INIT_16
00318                 INTRINSICS_YUV_MUL
00319                 INTRINSICS_YUV_ADD
00320                 INTRINSICS_UNPACK_16
00321 #   else
00322                 __asm__( MMX_INIT_16
00323                          : : "r" (p_y), "r" (p_u), "r" (p_v), "r" (p_buffer) );
00324 
00325                 __asm__( ".align 8"
00326                          MMX_YUV_MUL
00327                          MMX_YUV_ADD
00328                          MMX_UNPACK_16
00329                          : : "r" (p_y), "r" (p_u), "r" (p_v), "r" (p_buffer) );
00330 #   endif
00331 
00332                 p_y += 8;
00333                 p_u += 4;
00334                 p_v += 4;
00335                 p_buffer += 8;
00336             }
00337         }
00338 #endif
00339 
00340         /* Here we do some unaligned reads and duplicate conversions, but
00341          * at least we have all the pixels */
00342         if( i_rewind )
00343         {
00344 #if defined (MODULE_NAME_IS_i420_rgb_mmx)
00345 #   if defined (HAVE_MMX_INTRINSICS)
00346             __m64 mm0, mm1, mm2, mm3, mm4, mm5, mm6, mm7;
00347             uint64_t tmp64;
00348 #   endif
00349 #endif
00350             p_y -= i_rewind;
00351             p_u -= i_rewind >> 1;
00352             p_v -= i_rewind >> 1;
00353             p_buffer -= i_rewind;
00354 #if defined (MODULE_NAME_IS_i420_rgb)
00355             CONVERT_YUV_PIXEL(2);  CONVERT_Y_PIXEL(2);
00356             CONVERT_YUV_PIXEL(2);  CONVERT_Y_PIXEL(2);
00357             CONVERT_YUV_PIXEL(2);  CONVERT_Y_PIXEL(2);
00358             CONVERT_YUV_PIXEL(2);  CONVERT_Y_PIXEL(2);
00359 #elif defined (MODULE_NAME_IS_i420_rgb_mmx)
00360 
00361 #   if defined (HAVE_MMX_INTRINSICS)
00362             INTRINSICS_INIT_16
00363 #   else
00364             __asm__( MMX_INIT_16
00365                      : : "r" (p_y), "r" (p_u), "r" (p_v), "r" (p_buffer) );
00366 #   endif
00367 
00368             if( p_vout->output.i_rmask == 0x7c00 )
00369             {
00370                 /* 15bpp 5/5/5 */
00371 #   if defined (HAVE_MMX_INTRINSICS)
00372                 INTRINSICS_YUV_MUL
00373                 INTRINSICS_YUV_ADD
00374                 INTRINSICS_UNPACK_15
00375 #   else
00376                 __asm__( ".align 8"
00377                          MMX_YUV_MUL
00378                          MMX_YUV_ADD
00379                          MMX_UNPACK_15
00380                          : : "r" (p_y), "r" (p_u), "r" (p_v), "r" (p_buffer) );
00381 #   endif
00382             }
00383             else
00384             {
00385 #   if defined (HAVE_MMX_INTRINSICS)
00386                 INTRINSICS_YUV_MUL
00387                 INTRINSICS_YUV_ADD
00388                 INTRINSICS_UNPACK_16
00389 #   else
00390                 /* 16bpp 5/6/5 */
00391                 __asm__( ".align 8"
00392                          MMX_YUV_MUL
00393                          MMX_YUV_ADD
00394                          MMX_UNPACK_16
00395                          : : "r" (p_y), "r" (p_u), "r" (p_v), "r" (p_buffer) );
00396 #   endif
00397             }
00398 
00399             p_y += 8;
00400             p_u += 4;
00401             p_v += 4;
00402             p_buffer += 8;
00403 #endif
00404         }
00405         SCALE_WIDTH;
00406         SCALE_HEIGHT( 420, 2 );
00407 
00408         p_y += i_source_margin;
00409         if( i_y % 2 )
00410         {
00411             p_u += i_source_margin_c;
00412             p_v += i_source_margin_c;
00413         }
00414     }
00415 }
00416 
00417 /*****************************************************************************
00418  * I420_RGB32: color YUV 4:2:0 to RGB 32 bpp
00419  *****************************************************************************
00420  * Horizontal alignment needed:
00421  *  - input: 8 pixels (8 Y bytes, 4 U/V bytes), margins not allowed
00422  *  - output: 1 pixel (2 bytes), margins allowed
00423  * Vertical alignment needed:
00424  *  - input: 2 lines (2 Y lines, 1 U/V line)
00425  *  - output: 1 line
00426  *****************************************************************************/
00427 void E_(I420_RGB32)( vout_thread_t *p_vout, picture_t *p_src,
00428                                             picture_t *p_dest )
00429 {
00430     /* We got this one from the old arguments */
00431     uint32_t *p_pic = (uint32_t*)p_dest->p->p_pixels;
00432     uint8_t  *p_y   = p_src->Y_PIXELS;
00433     uint8_t  *p_u   = p_src->U_PIXELS;
00434     uint8_t  *p_v   = p_src->V_PIXELS;
00435 
00436     vlc_bool_t  b_hscale;                         /* horizontal scaling type */
00437     unsigned int i_vscale;                          /* vertical scaling type */
00438     unsigned int i_x, i_y;                /* horizontal and vertical indexes */
00439 
00440     int         i_right_margin;
00441     int         i_rewind;
00442     int         i_scale_count;                       /* scale modulo counter */
00443     int         i_chroma_width = p_vout->render.i_width / 2; /* chroma width */
00444     uint32_t *  p_pic_start;       /* beginning of the current line for copy */
00445 #if defined (MODULE_NAME_IS_i420_rgb)
00446     int         i_uval, i_vval;                           /* U and V samples */
00447     int         i_red, i_green, i_blue;          /* U and V modified samples */
00448     uint32_t *  p_yuv = p_vout->chroma.p_sys->p_rgb32;
00449     uint32_t *  p_ybase;                     /* Y dependant conversion table */
00450 #endif
00451 
00452     /* Conversion buffer pointer */
00453     uint32_t *  p_buffer_start = (uint32_t*)p_vout->chroma.p_sys->p_buffer;
00454     uint32_t *  p_buffer;
00455 
00456     /* Offset array pointer */
00457     int *       p_offset_start = p_vout->chroma.p_sys->p_offset;
00458     int *       p_offset;
00459 
00460     const int i_source_margin = p_src->p[0].i_pitch
00461                                  - p_src->p[0].i_visible_pitch;
00462     const int i_source_margin_c = p_src->p[1].i_pitch
00463                                  - p_src->p[1].i_visible_pitch;
00464 
00465     i_right_margin = p_dest->p->i_pitch - p_dest->p->i_visible_pitch;
00466 
00467     if( p_vout->render.i_width & 7 )
00468     {
00469         i_rewind = 8 - ( p_vout->render.i_width & 7 );
00470     }
00471     else
00472     {
00473         i_rewind = 0;
00474     }
00475 
00476     /* Rule: when a picture of size (x1,y1) with aspect ratio r1 is rendered
00477      * on a picture of size (x2,y2) with aspect ratio r2, if x1 grows to x1'
00478      * then y1 grows to y1' = x1' * y2/x2 * r2/r1 */
00479     SetOffset( p_vout->render.i_width, p_vout->render.i_height,
00480                p_vout->output.i_width, p_vout->output.i_height,
00481                &b_hscale, &i_vscale, p_offset_start );
00482 
00483     /*
00484      * Perform conversion
00485      */
00486     i_scale_count = ( i_vscale == 1 ) ?
00487                     p_vout->output.i_height : p_vout->render.i_height;
00488     for( i_y = 0; i_y < p_vout->render.i_height; i_y++ )
00489     {
00490         p_pic_start = p_pic;
00491         p_buffer = b_hscale ? p_buffer_start : p_pic;
00492 
00493         for ( i_x = p_vout->render.i_width / 8; i_x--; )
00494         {
00495 #if defined (MODULE_NAME_IS_i420_rgb)
00496             CONVERT_YUV_PIXEL(4);  CONVERT_Y_PIXEL(4);
00497             CONVERT_YUV_PIXEL(4);  CONVERT_Y_PIXEL(4);
00498             CONVERT_YUV_PIXEL(4);  CONVERT_Y_PIXEL(4);
00499             CONVERT_YUV_PIXEL(4);  CONVERT_Y_PIXEL(4);
00500 #elif defined (MODULE_NAME_IS_i420_rgb_mmx)
00501 #   if defined (HAVE_MMX_INTRINSICS)
00502             __m64 mm0, mm1, mm2, mm3, mm4, mm5, mm6, mm7;
00503             uint64_t tmp64;
00504             INTRINSICS_INIT_32
00505             INTRINSICS_YUV_MUL
00506             INTRINSICS_YUV_ADD
00507             INTRINSICS_UNPACK_32
00508 #   else
00509             __asm__( MMX_INIT_32
00510                      : : "r" (p_y), "r" (p_u), "r" (p_v), "r" (p_buffer) );
00511 
00512             __asm__( ".align 8"
00513                      MMX_YUV_MUL
00514                      MMX_YUV_ADD
00515                      MMX_UNPACK_32
00516                      : : "r" (p_y), "r" (p_u), "r" (p_v), "r" (p_buffer) );
00517 #   endif
00518 
00519             p_y += 8;
00520             p_u += 4;
00521             p_v += 4;
00522             p_buffer += 8;
00523 #endif
00524         }
00525 
00526         /* Here we do some unaligned reads and duplicate conversions, but
00527          * at least we have all the pixels */
00528         if( i_rewind )
00529         {
00530 #if defined (MODULE_NAME_IS_i420_rgb_mmx)
00531 #   if defined (HAVE_MMX_INTRINSICS)
00532             __m64 mm0, mm1, mm2, mm3, mm4, mm5, mm6, mm7;
00533             uint64_t tmp64;
00534 #   endif
00535 #endif
00536             p_y -= i_rewind;
00537             p_u -= i_rewind >> 1;
00538             p_v -= i_rewind >> 1;
00539             p_buffer -= i_rewind;
00540 #if defined (MODULE_NAME_IS_i420_rgb)
00541             CONVERT_YUV_PIXEL(4);  CONVERT_Y_PIXEL(4);
00542             CONVERT_YUV_PIXEL(4);  CONVERT_Y_PIXEL(4);
00543             CONVERT_YUV_PIXEL(4);  CONVERT_Y_PIXEL(4);
00544             CONVERT_YUV_PIXEL(4);  CONVERT_Y_PIXEL(4);
00545 #elif defined (MODULE_NAME_IS_i420_rgb_mmx)
00546 #   if defined (HAVE_MMX_INTRINSICS)
00547             INTRINSICS_INIT_32
00548             INTRINSICS_YUV_MUL
00549             INTRINSICS_YUV_ADD
00550             INTRINSICS_UNPACK_32
00551 #   else
00552             __asm__( MMX_INIT_32
00553                      : : "r" (p_y), "r" (p_u), "r" (p_v), "r" (p_buffer) );
00554 
00555             __asm__( ".align 8"
00556                      MMX_YUV_MUL
00557                      MMX_YUV_ADD
00558                      MMX_UNPACK_32
00559                      : : "r" (p_y), "r" (p_u), "r" (p_v), "r" (p_buffer) );
00560 #   endif
00561 
00562             p_y += 8;
00563             p_u += 4;
00564             p_v += 4;
00565             p_buffer += 8;
00566 #endif
00567         }
00568         SCALE_WIDTH;
00569         SCALE_HEIGHT( 420, 4 );
00570 
00571         p_y += i_source_margin;
00572         if( i_y % 2 )
00573         {
00574             p_u += i_source_margin_c;
00575             p_v += i_source_margin_c;
00576         }
00577     }
00578 }
00579 
00580 /* Following functions are local */
00581 
00582 /*****************************************************************************
00583  * SetOffset: build offset array for conversion functions
00584  *****************************************************************************
00585  * This function will build an offset array used in later conversion functions.
00586  * It will also set horizontal and vertical scaling indicators.
00587  *****************************************************************************/
00588 static void SetOffset( int i_width, int i_height, int i_pic_width,
00589                        int i_pic_height, vlc_bool_t *pb_hscale,
00590                        unsigned int *pi_vscale, int *p_offset )
00591 {
00592     int i_x;                                    /* x position in destination */
00593     int i_scale_count;                                     /* modulo counter */
00594 
00595     /*
00596      * Prepare horizontal offset array
00597      */
00598     if( i_pic_width - i_width == 0 )
00599     {
00600         /* No horizontal scaling: YUV conversion is done directly to picture */
00601         *pb_hscale = 0;
00602     }
00603     else if( i_pic_width - i_width > 0 )
00604     {
00605         /* Prepare scaling array for horizontal extension */
00606         *pb_hscale = 1;
00607         i_scale_count = i_pic_width;
00608         for( i_x = i_width; i_x--; )
00609         {
00610             while( (i_scale_count -= i_width) > 0 )
00611             {
00612                 *p_offset++ = 0;
00613             }
00614             *p_offset++ = 1;
00615             i_scale_count += i_pic_width;
00616         }
00617     }
00618     else /* if( i_pic_width - i_width < 0 ) */
00619     {
00620         /* Prepare scaling array for horizontal reduction */
00621         *pb_hscale = 1;
00622         i_scale_count = i_width;
00623         for( i_x = i_pic_width; i_x--; )
00624         {
00625             *p_offset = 1;
00626             while( (i_scale_count -= i_pic_width) > 0 )
00627             {
00628                 *p_offset += 1;
00629             }
00630             p_offset++;
00631             i_scale_count += i_width;
00632         }
00633     }
00634 
00635     /*
00636      * Set vertical scaling indicator
00637      */
00638     if( i_pic_height - i_height == 0 )
00639     {
00640         *pi_vscale = 0;
00641     }
00642     else if( i_pic_height - i_height > 0 )
00643     {
00644         *pi_vscale = 1;
00645     }
00646     else /* if( i_pic_height - i_height < 0 ) */
00647     {
00648         *pi_vscale = -1;
00649     }
00650 }
00651