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.
29469 Commits
32 Branches
325MB
Tree: 96c1e6d40d
Branches Tags
${ item.name }
Create branch ${ searchTerm }
from '96c1e6d40d'
${ noResults }
FFmpeg/libswscale/swscale_unscaled.c

960 lines
38KB
Raw Blame History 

  1. /*

  2.  * Copyright (C) 2001-2003 Michael Niedermayer <michaelni@gmx.at>

  3.  *

  4.  * This file is part of Libav.

  5.  *

  6.  * Libav is free software; you can redistribute it and/or

  7.  * modify it under the terms of the GNU Lesser General Public

  8.  * License as published by the Free Software Foundation; either

  9.  * version 2.1 of the License, or (at your option) any later version.

  10.  *

  11.  * Libav is distributed in the hope that it will be useful,

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

  13.  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

  14.  * Lesser General Public License for more details.

  15.  *

  16.  * You should have received a copy of the GNU Lesser General Public

  17.  * License along with Libav; if not, write to the Free Software

  18.  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA

  19.  */

  20. 

  21. #include <inttypes.h>

  22. #include <string.h>

  23. #include <math.h>

  24. #include <stdio.h>

  25. #include "config.h"

  26. #include <assert.h>

  27. #include "swscale.h"

  28. #include "swscale_internal.h"

  29. #include "rgb2rgb.h"

  30. #include "libavutil/intreadwrite.h"

  31. #include "libavutil/cpu.h"

  32. #include "libavutil/avutil.h"

  33. #include "libavutil/mathematics.h"

  34. #include "libavutil/bswap.h"

  35. #include "libavutil/pixdesc.h"

  36. 

  37. DECLARE_ALIGNED(8, const uint8_t, dither_8x8_1)[8][8] = {

  38.     {   0,  1,  0,  1,  0,  1,  0,  1,},

  39.     {   1,  0,  1,  0,  1,  0,  1,  0,},

  40.     {   0,  1,  0,  1,  0,  1,  0,  1,},

  41.     {   1,  0,  1,  0,  1,  0,  1,  0,},

  42.     {   0,  1,  0,  1,  0,  1,  0,  1,},

  43.     {   1,  0,  1,  0,  1,  0,  1,  0,},

  44.     {   0,  1,  0,  1,  0,  1,  0,  1,},

  45.     {   1,  0,  1,  0,  1,  0,  1,  0,},

  46. };

  47. DECLARE_ALIGNED(8, const uint8_t, dither_8x8_3)[8][8] = {

  48.     {   1,  2,  1,  2,  1,  2,  1,  2,},

  49.     {   3,  0,  3,  0,  3,  0,  3,  0,},

  50.     {   1,  2,  1,  2,  1,  2,  1,  2,},

  51.     {   3,  0,  3,  0,  3,  0,  3,  0,},

  52.     {   1,  2,  1,  2,  1,  2,  1,  2,},

  53.     {   3,  0,  3,  0,  3,  0,  3,  0,},

  54.     {   1,  2,  1,  2,  1,  2,  1,  2,},

  55.     {   3,  0,  3,  0,  3,  0,  3,  0,},

  56. };

  57. DECLARE_ALIGNED(8, const uint8_t, dither_8x8_64)[8][8] = {

  58.     {  18, 34, 30, 46, 17, 33, 29, 45,},

  59.     {  50,  2, 62, 14, 49,  1, 61, 13,},

  60.     {  26, 42, 22, 38, 25, 41, 21, 37,},

  61.     {  58, 10, 54,  6, 57,  9, 53,  5,},

  62.     {  16, 32, 28, 44, 19, 35, 31, 47,},

  63.     {  48,  0, 60, 12, 51,  3, 63, 15,},

  64.     {  24, 40, 20, 36, 27, 43, 23, 39,},

  65.     {  56,  8, 52,  4, 59, 11, 55,  7,},

  66. };

  67. extern const uint8_t dither_8x8_128[8][8];

  68. DECLARE_ALIGNED(8, const uint8_t, dither_8x8_256)[8][8] = {

  69.     {  72, 136, 120, 184,  68, 132, 116, 180,},

  70.     { 200,   8, 248,  56, 196,   4, 244,  52,},

  71.     { 104, 168,  88, 152, 100, 164,  84, 148,},

  72.     { 232,  40, 216,  24, 228,  36, 212,  20,},

  73.     {  64, 128, 102, 176,  76, 140, 124, 188,},

  74.     { 192,   0, 240,  48, 204,  12, 252,  60,},

  75.     {  96, 160,  80, 144, 108, 172,  92, 156,},

  76.     { 224,  32, 208,  16, 236,  44, 220,  28,},

  77. };

  78. 

  79. #define RGB2YUV_SHIFT 15

  80. #define BY ( (int)(0.114*219/255*(1<<RGB2YUV_SHIFT)+0.5))

  81. #define BV (-(int)(0.081*224/255*(1<<RGB2YUV_SHIFT)+0.5))

  82. #define BU ( (int)(0.500*224/255*(1<<RGB2YUV_SHIFT)+0.5))

  83. #define GY ( (int)(0.587*219/255*(1<<RGB2YUV_SHIFT)+0.5))

  84. #define GV (-(int)(0.419*224/255*(1<<RGB2YUV_SHIFT)+0.5))

  85. #define GU (-(int)(0.331*224/255*(1<<RGB2YUV_SHIFT)+0.5))

  86. #define RY ( (int)(0.299*219/255*(1<<RGB2YUV_SHIFT)+0.5))

  87. #define RV ( (int)(0.500*224/255*(1<<RGB2YUV_SHIFT)+0.5))

  88. #define RU (-(int)(0.169*224/255*(1<<RGB2YUV_SHIFT)+0.5))

  89. 

  90. static void fillPlane(uint8_t* plane, int stride, int width, int height, int y, uint8_t val)

  91. {

  92.     int i;

  93.     uint8_t *ptr = plane + stride*y;

  94.     for (i=0; i<height; i++) {

  95.         memset(ptr, val, width);

  96.         ptr += stride;

  97.     }

  98. }

  99. 

  100. static void copyPlane(const uint8_t *src, int srcStride,

  101.                       int srcSliceY, int srcSliceH, int width,

  102.                       uint8_t *dst, int dstStride)

  103. {

  104.     dst += dstStride * srcSliceY;

  105.     if (dstStride == srcStride && srcStride > 0) {

  106.         memcpy(dst, src, srcSliceH * dstStride);

  107.     } else {

  108.         int i;

  109.         for (i=0; i<srcSliceH; i++) {

  110.             memcpy(dst, src, width);

  111.             src += srcStride;

  112.             dst += dstStride;

  113.         }

  114.     }

  115. }

  116. 

  117. static int planarToNv12Wrapper(SwsContext *c, const uint8_t* src[], int srcStride[], int srcSliceY,

  118.                                int srcSliceH, uint8_t* dstParam[], int dstStride[])

  119. {

  120.     uint8_t *dst = dstParam[1] + dstStride[1]*srcSliceY/2;

  121. 

  122.     copyPlane(src[0], srcStride[0], srcSliceY, srcSliceH, c->srcW,

  123.               dstParam[0], dstStride[0]);

  124. 

  125.     if (c->dstFormat == PIX_FMT_NV12)

  126.         interleaveBytes(src[1], src[2], dst, c->srcW/2, srcSliceH/2, srcStride[1], srcStride[2], dstStride[0]);

  127.     else

  128.         interleaveBytes(src[2], src[1], dst, c->srcW/2, srcSliceH/2, srcStride[2], srcStride[1], dstStride[0]);

  129. 

  130.     return srcSliceH;

  131. }

  132. 

  133. static int planarToYuy2Wrapper(SwsContext *c, const uint8_t* src[], int srcStride[], int srcSliceY,

  134.                                int srcSliceH, uint8_t* dstParam[], int dstStride[])

  135. {

  136.     uint8_t *dst=dstParam[0] + dstStride[0]*srcSliceY;

  137. 

  138.     yv12toyuy2(src[0], src[1], src[2], dst, c->srcW, srcSliceH, srcStride[0], srcStride[1], dstStride[0]);

  139. 

  140.     return srcSliceH;

  141. }

  142. 

  143. static int planarToUyvyWrapper(SwsContext *c, const uint8_t* src[], int srcStride[], int srcSliceY,

  144.                                int srcSliceH, uint8_t* dstParam[], int dstStride[])

  145. {

  146.     uint8_t *dst=dstParam[0] + dstStride[0]*srcSliceY;

  147. 

  148.     yv12touyvy(src[0], src[1], src[2], dst, c->srcW, srcSliceH, srcStride[0], srcStride[1], dstStride[0]);

  149. 

  150.     return srcSliceH;

  151. }

  152. 

  153. static int yuv422pToYuy2Wrapper(SwsContext *c, const uint8_t* src[], int srcStride[], int srcSliceY,

  154.                                 int srcSliceH, uint8_t* dstParam[], int dstStride[])

  155. {

  156.     uint8_t *dst=dstParam[0] + dstStride[0]*srcSliceY;

  157. 

  158.     yuv422ptoyuy2(src[0],src[1],src[2],dst,c->srcW,srcSliceH,srcStride[0],srcStride[1],dstStride[0]);

  159. 

  160.     return srcSliceH;

  161. }

  162. 

  163. static int yuv422pToUyvyWrapper(SwsContext *c, const uint8_t* src[], int srcStride[], int srcSliceY,

  164.                                 int srcSliceH, uint8_t* dstParam[], int dstStride[])

  165. {

  166.     uint8_t *dst=dstParam[0] + dstStride[0]*srcSliceY;

  167. 

  168.     yuv422ptouyvy(src[0],src[1],src[2],dst,c->srcW,srcSliceH,srcStride[0],srcStride[1],dstStride[0]);

  169. 

  170.     return srcSliceH;

  171. }

  172. 

  173. static int yuyvToYuv420Wrapper(SwsContext *c, const uint8_t* src[], int srcStride[], int srcSliceY,

  174.                                int srcSliceH, uint8_t* dstParam[], int dstStride[])

  175. {

  176.     uint8_t *ydst=dstParam[0] + dstStride[0]*srcSliceY;

  177.     uint8_t *udst=dstParam[1] + dstStride[1]*srcSliceY/2;

  178.     uint8_t *vdst=dstParam[2] + dstStride[2]*srcSliceY/2;

  179. 

  180.     yuyvtoyuv420(ydst, udst, vdst, src[0], c->srcW, srcSliceH, dstStride[0], dstStride[1], srcStride[0]);

  181. 

  182.     if (dstParam[3])

  183.         fillPlane(dstParam[3], dstStride[3], c->srcW, srcSliceH, srcSliceY, 255);

  184. 

  185.     return srcSliceH;

  186. }

  187. 

  188. static int yuyvToYuv422Wrapper(SwsContext *c, const uint8_t* src[], int srcStride[], int srcSliceY,

  189.                                int srcSliceH, uint8_t* dstParam[], int dstStride[])

  190. {

  191.     uint8_t *ydst=dstParam[0] + dstStride[0]*srcSliceY;

  192.     uint8_t *udst=dstParam[1] + dstStride[1]*srcSliceY;

  193.     uint8_t *vdst=dstParam[2] + dstStride[2]*srcSliceY;

  194. 

  195.     yuyvtoyuv422(ydst, udst, vdst, src[0], c->srcW, srcSliceH, dstStride[0], dstStride[1], srcStride[0]);

  196. 

  197.     return srcSliceH;

  198. }

  199. 

  200. static int uyvyToYuv420Wrapper(SwsContext *c, const uint8_t* src[], int srcStride[], int srcSliceY,

  201.                                int srcSliceH, uint8_t* dstParam[], int dstStride[])

  202. {

  203.     uint8_t *ydst=dstParam[0] + dstStride[0]*srcSliceY;

  204.     uint8_t *udst=dstParam[1] + dstStride[1]*srcSliceY/2;

  205.     uint8_t *vdst=dstParam[2] + dstStride[2]*srcSliceY/2;

  206. 

  207.     uyvytoyuv420(ydst, udst, vdst, src[0], c->srcW, srcSliceH, dstStride[0], dstStride[1], srcStride[0]);

  208. 

  209.     if (dstParam[3])

  210.         fillPlane(dstParam[3], dstStride[3], c->srcW, srcSliceH, srcSliceY, 255);

  211. 

  212.     return srcSliceH;

  213. }

  214. 

  215. static int uyvyToYuv422Wrapper(SwsContext *c, const uint8_t* src[], int srcStride[], int srcSliceY,

  216.                                int srcSliceH, uint8_t* dstParam[], int dstStride[])

  217. {

  218.     uint8_t *ydst=dstParam[0] + dstStride[0]*srcSliceY;

  219.     uint8_t *udst=dstParam[1] + dstStride[1]*srcSliceY;

  220.     uint8_t *vdst=dstParam[2] + dstStride[2]*srcSliceY;

  221. 

  222.     uyvytoyuv422(ydst, udst, vdst, src[0], c->srcW, srcSliceH, dstStride[0], dstStride[1], srcStride[0]);

  223. 

  224.     return srcSliceH;

  225. }

  226. 

  227. static void gray8aToPacked32(const uint8_t *src, uint8_t *dst, int num_pixels, const uint8_t *palette)

  228. {

  229.     int i;

  230.     for (i=0; i<num_pixels; i++)

  231.         ((uint32_t *) dst)[i] = ((const uint32_t *)palette)[src[i<<1]] | (src[(i<<1)+1] << 24);

  232. }

  233. 

  234. static void gray8aToPacked32_1(const uint8_t *src, uint8_t *dst, int num_pixels, const uint8_t *palette)

  235. {

  236.     int i;

  237. 

  238.     for (i=0; i<num_pixels; i++)

  239.         ((uint32_t *) dst)[i] = ((const uint32_t *)palette)[src[i<<1]] | src[(i<<1)+1];

  240. }

  241. 

  242. static void gray8aToPacked24(const uint8_t *src, uint8_t *dst, int num_pixels, const uint8_t *palette)

  243. {

  244.     int i;

  245. 

  246.     for (i=0; i<num_pixels; i++) {

  247.         //FIXME slow?

  248.         dst[0]= palette[src[i<<1]*4+0];

  249.         dst[1]= palette[src[i<<1]*4+1];

  250.         dst[2]= palette[src[i<<1]*4+2];

  251.         dst+= 3;

  252.     }

  253. }

  254. 

  255. static int palToRgbWrapper(SwsContext *c, const uint8_t* src[], int srcStride[], int srcSliceY,

  256.                            int srcSliceH, uint8_t* dst[], int dstStride[])

  257. {

  258.     const enum PixelFormat srcFormat= c->srcFormat;

  259.     const enum PixelFormat dstFormat= c->dstFormat;

  260.     void (*conv)(const uint8_t *src, uint8_t *dst, int num_pixels,

  261.                  const uint8_t *palette)=NULL;

  262.     int i;

  263.     uint8_t *dstPtr= dst[0] + dstStride[0]*srcSliceY;

  264.     const uint8_t *srcPtr= src[0];

  265. 

  266.     if (srcFormat == PIX_FMT_Y400A) {

  267.         switch (dstFormat) {

  268.         case PIX_FMT_RGB32  : conv = gray8aToPacked32; break;

  269.         case PIX_FMT_BGR32  : conv = gray8aToPacked32; break;

  270.         case PIX_FMT_BGR32_1: conv = gray8aToPacked32_1; break;

  271.         case PIX_FMT_RGB32_1: conv = gray8aToPacked32_1; break;

  272.         case PIX_FMT_RGB24  : conv = gray8aToPacked24; break;

  273.         case PIX_FMT_BGR24  : conv = gray8aToPacked24; break;

  274.         }

  275.     } else if (usePal(srcFormat)) {

  276.         switch (dstFormat) {

  277.         case PIX_FMT_RGB32  : conv = sws_convertPalette8ToPacked32; break;

  278.         case PIX_FMT_BGR32  : conv = sws_convertPalette8ToPacked32; break;

  279.         case PIX_FMT_BGR32_1: conv = sws_convertPalette8ToPacked32; break;

  280.         case PIX_FMT_RGB32_1: conv = sws_convertPalette8ToPacked32; break;

  281.         case PIX_FMT_RGB24  : conv = sws_convertPalette8ToPacked24; break;

  282.         case PIX_FMT_BGR24  : conv = sws_convertPalette8ToPacked24; break;

  283.         }

  284.     }

  285. 

  286.     if (!conv)

  287.         av_log(c, AV_LOG_ERROR, "internal error %s -> %s converter\n",

  288.                sws_format_name(srcFormat), sws_format_name(dstFormat));

  289.     else {

  290.         for (i=0; i<srcSliceH; i++) {

  291.             conv(srcPtr, dstPtr, c->srcW, (uint8_t *) c->pal_rgb);

  292.             srcPtr+= srcStride[0];

  293.             dstPtr+= dstStride[0];

  294.         }

  295.     }

  296. 

  297.     return srcSliceH;

  298. }

  299. 

  300. #define isRGBA32(x) (            \

  301.            (x) == PIX_FMT_ARGB   \

  302.         || (x) == PIX_FMT_RGBA   \

  303.         || (x) == PIX_FMT_BGRA   \

  304.         || (x) == PIX_FMT_ABGR   \

  305.         )

  306. 

  307. /* {RGB,BGR}{15,16,24,32,32_1} -> {RGB,BGR}{15,16,24,32} */

  308. static int rgbToRgbWrapper(SwsContext *c, const uint8_t* src[], int srcStride[], int srcSliceY,

  309.                            int srcSliceH, uint8_t* dst[], int dstStride[])

  310. {

  311.     const enum PixelFormat srcFormat= c->srcFormat;

  312.     const enum PixelFormat dstFormat= c->dstFormat;

  313.     const int srcBpp= (c->srcFormatBpp + 7) >> 3;

  314.     const int dstBpp= (c->dstFormatBpp + 7) >> 3;

  315.     const int srcId= c->srcFormatBpp >> 2; /* 1:0, 4:1, 8:2, 15:3, 16:4, 24:6, 32:8 */

  316.     const int dstId= c->dstFormatBpp >> 2;

  317.     void (*conv)(const uint8_t *src, uint8_t *dst, int src_size)=NULL;

  318. 

  319. #define CONV_IS(src, dst) (srcFormat == PIX_FMT_##src && dstFormat == PIX_FMT_##dst)

  320. 

  321.     if (isRGBA32(srcFormat) && isRGBA32(dstFormat)) {

  322.         if (     CONV_IS(ABGR, RGBA)

  323.               || CONV_IS(ARGB, BGRA)

  324.               || CONV_IS(BGRA, ARGB)

  325.               || CONV_IS(RGBA, ABGR)) conv = shuffle_bytes_3210;

  326.         else if (CONV_IS(ABGR, ARGB)

  327.               || CONV_IS(ARGB, ABGR)) conv = shuffle_bytes_0321;

  328.         else if (CONV_IS(ABGR, BGRA)

  329.               || CONV_IS(ARGB, RGBA)) conv = shuffle_bytes_1230;

  330.         else if (CONV_IS(BGRA, RGBA)

  331.               || CONV_IS(RGBA, BGRA)) conv = shuffle_bytes_2103;

  332.         else if (CONV_IS(BGRA, ABGR)

  333.               || CONV_IS(RGBA, ARGB)) conv = shuffle_bytes_3012;

  334.     } else

  335.     /* BGR -> BGR */

  336.     if (  (isBGRinInt(srcFormat) && isBGRinInt(dstFormat))

  337.        || (isRGBinInt(srcFormat) && isRGBinInt(dstFormat))) {

  338.         switch(srcId | (dstId<<4)) {

  339.         case 0x34: conv= rgb16to15; break;

  340.         case 0x36: conv= rgb24to15; break;

  341.         case 0x38: conv= rgb32to15; break;

  342.         case 0x43: conv= rgb15to16; break;

  343.         case 0x46: conv= rgb24to16; break;

  344.         case 0x48: conv= rgb32to16; break;

  345.         case 0x63: conv= rgb15to24; break;

  346.         case 0x64: conv= rgb16to24; break;

  347.         case 0x68: conv= rgb32to24; break;

  348.         case 0x83: conv= rgb15to32; break;

  349.         case 0x84: conv= rgb16to32; break;

  350.         case 0x86: conv= rgb24to32; break;

  351.         }

  352.     } else if (  (isBGRinInt(srcFormat) && isRGBinInt(dstFormat))

  353.              || (isRGBinInt(srcFormat) && isBGRinInt(dstFormat))) {

  354.         switch(srcId | (dstId<<4)) {

  355.         case 0x33: conv= rgb15tobgr15; break;

  356.         case 0x34: conv= rgb16tobgr15; break;

  357.         case 0x36: conv= rgb24tobgr15; break;

  358.         case 0x38: conv= rgb32tobgr15; break;

  359.         case 0x43: conv= rgb15tobgr16; break;

  360.         case 0x44: conv= rgb16tobgr16; break;

  361.         case 0x46: conv= rgb24tobgr16; break;

  362.         case 0x48: conv= rgb32tobgr16; break;

  363.         case 0x63: conv= rgb15tobgr24; break;

  364.         case 0x64: conv= rgb16tobgr24; break;

  365.         case 0x66: conv= rgb24tobgr24; break;

  366.         case 0x68: conv= rgb32tobgr24; break;

  367.         case 0x83: conv= rgb15tobgr32; break;

  368.         case 0x84: conv= rgb16tobgr32; break;

  369.         case 0x86: conv= rgb24tobgr32; break;

  370.         }

  371.     }

  372. 

  373.     if (!conv) {

  374.         av_log(c, AV_LOG_ERROR, "internal error %s -> %s converter\n",

  375.                sws_format_name(srcFormat), sws_format_name(dstFormat));

  376.     } else {

  377.         const uint8_t *srcPtr= src[0];

  378.               uint8_t *dstPtr= dst[0];

  379.         if ((srcFormat == PIX_FMT_RGB32_1 || srcFormat == PIX_FMT_BGR32_1) && !isRGBA32(dstFormat))

  380.             srcPtr += ALT32_CORR;

  381. 

  382.         if ((dstFormat == PIX_FMT_RGB32_1 || dstFormat == PIX_FMT_BGR32_1) && !isRGBA32(srcFormat))

  383.             dstPtr += ALT32_CORR;

  384. 

  385.         if (dstStride[0]*srcBpp == srcStride[0]*dstBpp && srcStride[0] > 0)

  386.             conv(srcPtr, dstPtr + dstStride[0]*srcSliceY, srcSliceH*srcStride[0]);

  387.         else {

  388.             int i;

  389.             dstPtr += dstStride[0]*srcSliceY;

  390. 

  391.             for (i=0; i<srcSliceH; i++) {

  392.                 conv(srcPtr, dstPtr, c->srcW*srcBpp);

  393.                 srcPtr+= srcStride[0];

  394.                 dstPtr+= dstStride[0];

  395.             }

  396.         }

  397.     }

  398.     return srcSliceH;

  399. }

  400. 

  401. static int bgr24ToYv12Wrapper(SwsContext *c, const uint8_t* src[], int srcStride[], int srcSliceY,

  402.                               int srcSliceH, uint8_t* dst[], int dstStride[])

  403. {

  404.     rgb24toyv12(

  405.         src[0],

  406.         dst[0]+ srcSliceY    *dstStride[0],

  407.         dst[1]+(srcSliceY>>1)*dstStride[1],

  408.         dst[2]+(srcSliceY>>1)*dstStride[2],

  409.         c->srcW, srcSliceH,

  410.         dstStride[0], dstStride[1], srcStride[0]);

  411.     if (dst[3])

  412.         fillPlane(dst[3], dstStride[3], c->srcW, srcSliceH, srcSliceY, 255);

  413.     return srcSliceH;

  414. }

  415. 

  416. static int yvu9ToYv12Wrapper(SwsContext *c, const uint8_t* src[], int srcStride[], int srcSliceY,

  417.                              int srcSliceH, uint8_t* dst[], int dstStride[])

  418. {

  419.     copyPlane(src[0], srcStride[0], srcSliceY, srcSliceH, c->srcW,

  420.               dst[0], dstStride[0]);

  421. 

  422.     planar2x(src[1], dst[1] + dstStride[1]*(srcSliceY >> 1), c->chrSrcW,

  423.              srcSliceH >> 2, srcStride[1], dstStride[1]);

  424.     planar2x(src[2], dst[2] + dstStride[2]*(srcSliceY >> 1), c->chrSrcW,

  425.              srcSliceH >> 2, srcStride[2], dstStride[2]);

  426.     if (dst[3])

  427.         fillPlane(dst[3], dstStride[3], c->srcW, srcSliceH, srcSliceY, 255);

  428.     return srcSliceH;

  429. }

  430. 

  431. /* unscaled copy like stuff (assumes nearly identical formats) */

  432. static int packedCopyWrapper(SwsContext *c, const uint8_t* src[], int srcStride[], int srcSliceY,

  433.                              int srcSliceH, uint8_t* dst[], int dstStride[])

  434. {

  435.     if (dstStride[0]==srcStride[0] && srcStride[0] > 0)

  436.         memcpy(dst[0] + dstStride[0]*srcSliceY, src[0], srcSliceH*dstStride[0]);

  437.     else {

  438.         int i;

  439.         const uint8_t *srcPtr= src[0];

  440.         uint8_t *dstPtr= dst[0] + dstStride[0]*srcSliceY;

  441.         int length=0;

  442. 

  443.         /* universal length finder */

  444.         while(length+c->srcW <= FFABS(dstStride[0])

  445.            && length+c->srcW <= FFABS(srcStride[0])) length+= c->srcW;

  446.         assert(length!=0);

  447. 

  448.         for (i=0; i<srcSliceH; i++) {

  449.             memcpy(dstPtr, srcPtr, length);

  450.             srcPtr+= srcStride[0];

  451.             dstPtr+= dstStride[0];

  452.         }

  453.     }

  454.     return srcSliceH;

  455. }

  456. 

  457. #define DITHER_COPY(dst, dstStride, wfunc, src, srcStride, rfunc, dithers, shift) \

  458.     for (i = 0; i < height; i++) { \

  459.         const uint8_t *dither = dithers[i & 7]; \

  460.         for (j = 0; j < length - 7; j += 8) { \

  461.             wfunc(&dst[j + 0], (rfunc(&src[j + 0]) + dither[0]) >> shift); \

  462.             wfunc(&dst[j + 1], (rfunc(&src[j + 1]) + dither[1]) >> shift); \

  463.             wfunc(&dst[j + 2], (rfunc(&src[j + 2]) + dither[2]) >> shift); \

  464.             wfunc(&dst[j + 3], (rfunc(&src[j + 3]) + dither[3]) >> shift); \

  465.             wfunc(&dst[j + 4], (rfunc(&src[j + 4]) + dither[4]) >> shift); \

  466.             wfunc(&dst[j + 5], (rfunc(&src[j + 5]) + dither[5]) >> shift); \

  467.             wfunc(&dst[j + 6], (rfunc(&src[j + 6]) + dither[6]) >> shift); \

  468.             wfunc(&dst[j + 7], (rfunc(&src[j + 7]) + dither[7]) >> shift); \

  469.         } \

  470.         for (; j < length; j++) \

  471.             wfunc(&dst[j],     (rfunc(&src[j]) + dither[j & 7]) >> shift); \

  472.         dst += dstStride; \

  473.         src += srcStride; \

  474.     }

  475. 

  476. static int planarCopyWrapper(SwsContext *c, const uint8_t* src[], int srcStride[], int srcSliceY,

  477.                              int srcSliceH, uint8_t* dst[], int dstStride[])

  478. {

  479.     int plane, i, j;

  480.     for (plane=0; plane<4; plane++) {

  481.         int length= (plane==0 || plane==3) ? c->srcW  : -((-c->srcW  )>>c->chrDstHSubSample);

  482.         int y=      (plane==0 || plane==3) ? srcSliceY: -((-srcSliceY)>>c->chrDstVSubSample);

  483.         int height= (plane==0 || plane==3) ? srcSliceH: -((-srcSliceH)>>c->chrDstVSubSample);

  484.         const uint8_t *srcPtr= src[plane];

  485.         uint8_t *dstPtr= dst[plane] + dstStride[plane]*y;

  486. 

  487.         if (!dst[plane]) continue;

  488.         // ignore palette for GRAY8

  489.         if (plane == 1 && !dst[2]) continue;

  490.         if (!src[plane] || (plane == 1 && !src[2])) {

  491.             if(is16BPS(c->dstFormat))

  492.                 length*=2;

  493.             fillPlane(dst[plane], dstStride[plane], length, height, y, (plane==3) ? 255 : 128);

  494.         } else {

  495.             if(is9_OR_10BPS(c->srcFormat)) {

  496.                 const int src_depth = av_pix_fmt_descriptors[c->srcFormat].comp[plane].depth_minus1+1;

  497.                 const int dst_depth = av_pix_fmt_descriptors[c->dstFormat].comp[plane].depth_minus1+1;

  498.                 const uint16_t *srcPtr2 = (const uint16_t*)srcPtr;

  499. 

  500.                 if (is16BPS(c->dstFormat)) {

  501.                     uint16_t *dstPtr2 = (uint16_t*)dstPtr;

  502. #define COPY9_OR_10TO16(rfunc, wfunc) \

  503.                     for (i = 0; i < height; i++) { \

  504.                         for (j = 0; j < length; j++) { \

  505.                             int srcpx = rfunc(&srcPtr2[j]); \

  506.                             wfunc(&dstPtr2[j], (srcpx<<(16-src_depth)) | (srcpx>>(2*src_depth-16))); \

  507.                         } \

  508.                         dstPtr2 += dstStride[plane]/2; \

  509.                         srcPtr2 += srcStride[plane]/2; \

  510.                     }

  511.                     if (isBE(c->dstFormat)) {

  512.                         if (isBE(c->srcFormat)) {

  513.                             COPY9_OR_10TO16(AV_RB16, AV_WB16);

  514.                         } else {

  515.                             COPY9_OR_10TO16(AV_RL16, AV_WB16);

  516.                         }

  517.                     } else {

  518.                         if (isBE(c->srcFormat)) {

  519.                             COPY9_OR_10TO16(AV_RB16, AV_WL16);

  520.                         } else {

  521.                             COPY9_OR_10TO16(AV_RL16, AV_WL16);

  522.                         }

  523.                     }

  524.                 } else if (is9_OR_10BPS(c->dstFormat)) {

  525.                     uint16_t *dstPtr2 = (uint16_t*)dstPtr;

  526. #define COPY9_OR_10TO9_OR_10(loop) \

  527.                     for (i = 0; i < height; i++) { \

  528.                         for (j = 0; j < length; j++) { \

  529.                             loop; \

  530.                         } \

  531.                         dstPtr2 += dstStride[plane]/2; \

  532.                         srcPtr2 += srcStride[plane]/2; \

  533.                     }

  534. #define COPY9_OR_10TO9_OR_10_2(rfunc, wfunc) \

  535.                     if (dst_depth > src_depth) { \

  536.                         COPY9_OR_10TO9_OR_10(int srcpx = rfunc(&srcPtr2[j]); \

  537.                             wfunc(&dstPtr2[j], (srcpx << 1) | (srcpx >> 9))); \

  538.                     } else if (dst_depth < src_depth) { \

  539.                         DITHER_COPY(dstPtr2, dstStride[plane]/2, wfunc, \

  540.                                     srcPtr2, srcStride[plane]/2, rfunc, \

  541.                                     dither_8x8_1, 1); \

  542.                     } else { \

  543.                         COPY9_OR_10TO9_OR_10(wfunc(&dstPtr2[j], rfunc(&srcPtr2[j]))); \

  544.                     }

  545.                     if (isBE(c->dstFormat)) {

  546.                         if (isBE(c->srcFormat)) {

  547.                             COPY9_OR_10TO9_OR_10_2(AV_RB16, AV_WB16);

  548.                         } else {

  549.                             COPY9_OR_10TO9_OR_10_2(AV_RL16, AV_WB16);

  550.                         }

  551.                     } else {

  552.                         if (isBE(c->srcFormat)) {

  553.                             COPY9_OR_10TO9_OR_10_2(AV_RB16, AV_WL16);

  554.                         } else {

  555.                             COPY9_OR_10TO9_OR_10_2(AV_RL16, AV_WL16);

  556.                         }

  557.                     }

  558.                 } else {

  559. #define W8(a, b) { *(a) = (b); }

  560. #define COPY9_OR_10TO8(rfunc) \

  561.                     if (src_depth == 9) { \

  562.                         DITHER_COPY(dstPtr,  dstStride[plane],   W8, \

  563.                                     srcPtr2, srcStride[plane]/2, rfunc, \

  564.                                     dither_8x8_1, 1); \

  565.                     } else { \

  566.                         DITHER_COPY(dstPtr,  dstStride[plane],   W8, \

  567.                                     srcPtr2, srcStride[plane]/2, rfunc, \

  568.                                     dither_8x8_3, 2); \

  569.                     }

  570.                     if (isBE(c->srcFormat)) {

  571.                         COPY9_OR_10TO8(AV_RB16);

  572.                     } else {

  573.                         COPY9_OR_10TO8(AV_RL16);

  574.                     }

  575.                 }

  576.             } else if(is9_OR_10BPS(c->dstFormat)) {

  577.                 const int dst_depth = av_pix_fmt_descriptors[c->dstFormat].comp[plane].depth_minus1+1;

  578.                 uint16_t *dstPtr2 = (uint16_t*)dstPtr;

  579. 

  580.                 if (is16BPS(c->srcFormat)) {

  581.                     const uint16_t *srcPtr2 = (const uint16_t*)srcPtr;

  582. #define COPY16TO9_OR_10(rfunc, wfunc) \

  583.                     if (dst_depth == 9) { \

  584.                         DITHER_COPY(dstPtr2, dstStride[plane]/2, wfunc, \

  585.                                     srcPtr2, srcStride[plane]/2, rfunc, \

  586.                                     dither_8x8_128, 7); \

  587.                     } else { \

  588.                         DITHER_COPY(dstPtr2, dstStride[plane]/2, wfunc, \

  589.                                     srcPtr2, srcStride[plane]/2, rfunc, \

  590.                                     dither_8x8_64, 6); \

  591.                     }

  592.                     if (isBE(c->dstFormat)) {

  593.                         if (isBE(c->srcFormat)) {

  594.                             COPY16TO9_OR_10(AV_RB16, AV_WB16);

  595.                         } else {

  596.                             COPY16TO9_OR_10(AV_RL16, AV_WB16);

  597.                         }

  598.                     } else {

  599.                         if (isBE(c->srcFormat)) {

  600.                             COPY16TO9_OR_10(AV_RB16, AV_WL16);

  601.                         } else {

  602.                             COPY16TO9_OR_10(AV_RL16, AV_WL16);

  603.                         }

  604.                     }

  605.                 } else /* 8bit */ {

  606. #define COPY8TO9_OR_10(wfunc) \

  607.                     for (i = 0; i < height; i++) { \

  608.                         for (j = 0; j < length; j++) { \

  609.                             const int srcpx = srcPtr[j]; \

  610.                             wfunc(&dstPtr2[j], (srcpx<<(dst_depth-8)) | (srcpx >> (16-dst_depth))); \

  611.                         } \

  612.                         dstPtr2 += dstStride[plane]/2; \

  613.                         srcPtr  += srcStride[plane]; \

  614.                     }

  615.                     if (isBE(c->dstFormat)) {

  616.                         COPY8TO9_OR_10(AV_WB16);

  617.                     } else {

  618.                         COPY8TO9_OR_10(AV_WL16);

  619.                     }

  620.                 }

  621.             } else if(is16BPS(c->srcFormat) && !is16BPS(c->dstFormat)) {

  622.                 const uint16_t *srcPtr2 = (const uint16_t*)srcPtr;

  623. #define COPY16TO8(rfunc) \

  624.                     DITHER_COPY(dstPtr,  dstStride[plane],   W8, \

  625.                                 srcPtr2, srcStride[plane]/2, rfunc, \

  626.                                 dither_8x8_256, 8);

  627.                 if (isBE(c->srcFormat)) {

  628.                     COPY16TO8(AV_RB16);

  629.                 } else {

  630.                     COPY16TO8(AV_RL16);

  631.                 }

  632.             } else if(!is16BPS(c->srcFormat) && is16BPS(c->dstFormat)) {

  633.                 for (i=0; i<height; i++) {

  634.                     for (j=0; j<length; j++) {

  635.                         dstPtr[ j<<1   ] = srcPtr[j];

  636.                         dstPtr[(j<<1)+1] = srcPtr[j];

  637.                     }

  638.                     srcPtr+= srcStride[plane];

  639.                     dstPtr+= dstStride[plane];

  640.                 }

  641.             } else if(is16BPS(c->srcFormat) && is16BPS(c->dstFormat)

  642.                   && isBE(c->srcFormat) != isBE(c->dstFormat)) {

  643. 

  644.                 for (i=0; i<height; i++) {

  645.                     for (j=0; j<length; j++)

  646.                         ((uint16_t*)dstPtr)[j] = av_bswap16(((const uint16_t*)srcPtr)[j]);

  647.                     srcPtr+= srcStride[plane];

  648.                     dstPtr+= dstStride[plane];

  649.                 }

  650.             } else if (dstStride[plane] == srcStride[plane] &&

  651.                        srcStride[plane] > 0 && srcStride[plane] == length) {

  652.                 memcpy(dst[plane] + dstStride[plane]*y, src[plane],

  653.                        height*dstStride[plane]);

  654.             } else {

  655.                 if(is16BPS(c->srcFormat) && is16BPS(c->dstFormat))

  656.                     length*=2;

  657.                 for (i=0; i<height; i++) {

  658.                     memcpy(dstPtr, srcPtr, length);

  659.                     srcPtr+= srcStride[plane];

  660.                     dstPtr+= dstStride[plane];

  661.                 }

  662.             }

  663.         }

  664.     }

  665.     return srcSliceH;

  666. }

  667. 

  668. void ff_get_unscaled_swscale(SwsContext *c)

  669. {

  670.     const enum PixelFormat srcFormat = c->srcFormat;

  671.     const enum PixelFormat dstFormat = c->dstFormat;

  672.     const int flags = c->flags;

  673.     const int dstH = c->dstH;

  674.     int needsDither;

  675. 

  676.     needsDither= isAnyRGB(dstFormat)

  677.         &&  c->dstFormatBpp < 24

  678.         && (c->dstFormatBpp < c->srcFormatBpp || (!isAnyRGB(srcFormat)));

  679. 

  680.     /* yv12_to_nv12 */

  681.     if ((srcFormat == PIX_FMT_YUV420P || srcFormat == PIX_FMT_YUVA420P) && (dstFormat == PIX_FMT_NV12 || dstFormat == PIX_FMT_NV21)) {

  682.         c->swScale= planarToNv12Wrapper;

  683.     }

  684.     /* yuv2bgr */

  685.     if ((srcFormat==PIX_FMT_YUV420P || srcFormat==PIX_FMT_YUV422P || srcFormat==PIX_FMT_YUVA420P) && isAnyRGB(dstFormat)

  686.         && !(flags & SWS_ACCURATE_RND) && !(dstH&1)) {

  687.         c->swScale= ff_yuv2rgb_get_func_ptr(c);

  688.     }

  689. 

  690.     if (srcFormat==PIX_FMT_YUV410P && (dstFormat==PIX_FMT_YUV420P || dstFormat==PIX_FMT_YUVA420P) && !(flags & SWS_BITEXACT)) {

  691.         c->swScale= yvu9ToYv12Wrapper;

  692.     }

  693. 

  694.     /* bgr24toYV12 */

  695.     if (srcFormat==PIX_FMT_BGR24 && (dstFormat==PIX_FMT_YUV420P || dstFormat==PIX_FMT_YUVA420P) && !(flags & SWS_ACCURATE_RND))

  696.         c->swScale= bgr24ToYv12Wrapper;

  697. 

  698.     /* RGB/BGR -> RGB/BGR (no dither needed forms) */

  699.     if (   isAnyRGB(srcFormat)

  700.         && isAnyRGB(dstFormat)

  701.         && srcFormat != PIX_FMT_BGR8      && dstFormat != PIX_FMT_BGR8

  702.         && srcFormat != PIX_FMT_RGB8      && dstFormat != PIX_FMT_RGB8

  703.         && srcFormat != PIX_FMT_BGR4      && dstFormat != PIX_FMT_BGR4

  704.         && srcFormat != PIX_FMT_RGB4      && dstFormat != PIX_FMT_RGB4

  705.         && srcFormat != PIX_FMT_BGR4_BYTE && dstFormat != PIX_FMT_BGR4_BYTE

  706.         && srcFormat != PIX_FMT_RGB4_BYTE && dstFormat != PIX_FMT_RGB4_BYTE

  707.         && srcFormat != PIX_FMT_MONOBLACK && dstFormat != PIX_FMT_MONOBLACK

  708.         && srcFormat != PIX_FMT_MONOWHITE && dstFormat != PIX_FMT_MONOWHITE

  709.         && srcFormat != PIX_FMT_RGB48LE   && dstFormat != PIX_FMT_RGB48LE

  710.         && srcFormat != PIX_FMT_RGB48BE   && dstFormat != PIX_FMT_RGB48BE

  711.         && srcFormat != PIX_FMT_BGR48LE   && dstFormat != PIX_FMT_BGR48LE

  712.         && srcFormat != PIX_FMT_BGR48BE   && dstFormat != PIX_FMT_BGR48BE

  713.         && (!needsDither || (c->flags&(SWS_FAST_BILINEAR|SWS_POINT))))

  714.         c->swScale= rgbToRgbWrapper;

  715. 

  716.     if ((usePal(srcFormat) && (

  717.         dstFormat == PIX_FMT_RGB32   ||

  718.         dstFormat == PIX_FMT_RGB32_1 ||

  719.         dstFormat == PIX_FMT_RGB24   ||

  720.         dstFormat == PIX_FMT_BGR32   ||

  721.         dstFormat == PIX_FMT_BGR32_1 ||

  722.         dstFormat == PIX_FMT_BGR24)))

  723.         c->swScale= palToRgbWrapper;

  724. 

  725.     if (srcFormat == PIX_FMT_YUV422P) {

  726.         if (dstFormat == PIX_FMT_YUYV422)

  727.             c->swScale= yuv422pToYuy2Wrapper;

  728.         else if (dstFormat == PIX_FMT_UYVY422)

  729.             c->swScale= yuv422pToUyvyWrapper;

  730.     }

  731. 

  732.     /* LQ converters if -sws 0 or -sws 4*/

  733.     if (c->flags&(SWS_FAST_BILINEAR|SWS_POINT)) {

  734.         /* yv12_to_yuy2 */

  735.         if (srcFormat == PIX_FMT_YUV420P || srcFormat == PIX_FMT_YUVA420P) {

  736.             if (dstFormat == PIX_FMT_YUYV422)

  737.                 c->swScale= planarToYuy2Wrapper;

  738.             else if (dstFormat == PIX_FMT_UYVY422)

  739.                 c->swScale= planarToUyvyWrapper;

  740.         }

  741.     }

  742.     if(srcFormat == PIX_FMT_YUYV422 && (dstFormat == PIX_FMT_YUV420P || dstFormat == PIX_FMT_YUVA420P))

  743.         c->swScale= yuyvToYuv420Wrapper;

  744.     if(srcFormat == PIX_FMT_UYVY422 && (dstFormat == PIX_FMT_YUV420P || dstFormat == PIX_FMT_YUVA420P))

  745.         c->swScale= uyvyToYuv420Wrapper;

  746.     if(srcFormat == PIX_FMT_YUYV422 && dstFormat == PIX_FMT_YUV422P)

  747.         c->swScale= yuyvToYuv422Wrapper;

  748.     if(srcFormat == PIX_FMT_UYVY422 && dstFormat == PIX_FMT_YUV422P)

  749.         c->swScale= uyvyToYuv422Wrapper;

  750. 

  751.     /* simple copy */

  752.     if (  srcFormat == dstFormat

  753.         || (srcFormat == PIX_FMT_YUVA420P && dstFormat == PIX_FMT_YUV420P)

  754.         || (srcFormat == PIX_FMT_YUV420P && dstFormat == PIX_FMT_YUVA420P)

  755.         || (isPlanarYUV(srcFormat) && isGray(dstFormat))

  756.         || (isPlanarYUV(dstFormat) && isGray(srcFormat))

  757.         || (isGray(dstFormat) && isGray(srcFormat))

  758.         || (isPlanarYUV(srcFormat) && isPlanarYUV(dstFormat)

  759.             && c->chrDstHSubSample == c->chrSrcHSubSample

  760.             && c->chrDstVSubSample == c->chrSrcVSubSample

  761.             && dstFormat != PIX_FMT_NV12 && dstFormat != PIX_FMT_NV21

  762.             && srcFormat != PIX_FMT_NV12 && srcFormat != PIX_FMT_NV21))

  763.     {

  764.         if (isPacked(c->srcFormat))

  765.             c->swScale= packedCopyWrapper;

  766.         else /* Planar YUV or gray */

  767.             c->swScale= planarCopyWrapper;

  768.     }

  769. 

  770.     if (ARCH_BFIN)

  771.         ff_bfin_get_unscaled_swscale(c);

  772.     if (HAVE_ALTIVEC)

  773.         ff_swscale_get_unscaled_altivec(c);

  774. }

  775. 

  776. static void reset_ptr(const uint8_t* src[], int format)

  777. {

  778.     if(!isALPHA(format))

  779.         src[3]=NULL;

  780.     if(!isPlanarYUV(format)) {

  781.         src[3]=src[2]=NULL;

  782. 

  783.         if (!usePal(format))

  784.             src[1]= NULL;

  785.     }

  786. }

  787. 

  788. static int check_image_pointers(uint8_t *data[4], enum PixelFormat pix_fmt,

  789.                                 const int linesizes[4])

  790. {

  791.     const AVPixFmtDescriptor *desc = &av_pix_fmt_descriptors[pix_fmt];

  792.     int i;

  793. 

  794.     for (i = 0; i < 4; i++) {

  795.         int plane = desc->comp[i].plane;

  796.         if (!data[plane] || !linesizes[plane])

  797.             return 0;

  798.     }

  799. 

  800.     return 1;

  801. }

  802. 

  803. /**

  804.  * swscale wrapper, so we don't need to export the SwsContext.

  805.  * Assumes planar YUV to be in YUV order instead of YVU.

  806.  */

  807. int sws_scale(struct SwsContext *c, const uint8_t* const srcSlice[],

  808.               const int srcStride[], int srcSliceY, int srcSliceH,

  809.               uint8_t* const dst[], const int dstStride[])

  810. {

  811.     int i;

  812.     const uint8_t* src2[4]= {srcSlice[0], srcSlice[1], srcSlice[2], srcSlice[3]};

  813.     uint8_t* dst2[4]= {dst[0], dst[1], dst[2], dst[3]};

  814. 

  815.     // do not mess up sliceDir if we have a "trailing" 0-size slice

  816.     if (srcSliceH == 0)

  817.         return 0;

  818. 

  819.     if (!check_image_pointers(srcSlice, c->srcFormat, srcStride)) {

  820.         av_log(c, AV_LOG_ERROR, "bad src image pointers\n");

  821.         return 0;

  822.     }

  823.     if (!check_image_pointers(dst, c->dstFormat, dstStride)) {

  824.         av_log(c, AV_LOG_ERROR, "bad dst image pointers\n");

  825.         return 0;

  826.     }

  827. 

  828.     if (c->sliceDir == 0 && srcSliceY != 0 && srcSliceY + srcSliceH != c->srcH) {

  829.         av_log(c, AV_LOG_ERROR, "Slices start in the middle!\n");

  830.         return 0;

  831.     }

  832.     if (c->sliceDir == 0) {

  833.         if (srcSliceY == 0) c->sliceDir = 1; else c->sliceDir = -1;

  834.     }

  835. 

  836.     if (usePal(c->srcFormat)) {

  837.         for (i=0; i<256; i++) {

  838.             int p, r, g, b,y,u,v;

  839.             if(c->srcFormat == PIX_FMT_PAL8) {

  840.                 p=((const uint32_t*)(srcSlice[1]))[i];

  841.                 r= (p>>16)&0xFF;

  842.                 g= (p>> 8)&0xFF;

  843.                 b=  p     &0xFF;

  844.             } else if(c->srcFormat == PIX_FMT_RGB8) {

  845.                 r= (i>>5    )*36;

  846.                 g= ((i>>2)&7)*36;

  847.                 b= (i&3     )*85;

  848.             } else if(c->srcFormat == PIX_FMT_BGR8) {

  849.                 b= (i>>6    )*85;

  850.                 g= ((i>>3)&7)*36;

  851.                 r= (i&7     )*36;

  852.             } else if(c->srcFormat == PIX_FMT_RGB4_BYTE) {

  853.                 r= (i>>3    )*255;

  854.                 g= ((i>>1)&3)*85;

  855.                 b= (i&1     )*255;

  856.             } else if(c->srcFormat == PIX_FMT_GRAY8 || c->srcFormat == PIX_FMT_Y400A) {

  857.                 r = g = b = i;

  858.             } else {

  859.                 assert(c->srcFormat == PIX_FMT_BGR4_BYTE);

  860.                 b= (i>>3    )*255;

  861.                 g= ((i>>1)&3)*85;

  862.                 r= (i&1     )*255;

  863.             }

  864.             y= av_clip_uint8((RY*r + GY*g + BY*b + ( 33<<(RGB2YUV_SHIFT-1)))>>RGB2YUV_SHIFT);

  865.             u= av_clip_uint8((RU*r + GU*g + BU*b + (257<<(RGB2YUV_SHIFT-1)))>>RGB2YUV_SHIFT);

  866.             v= av_clip_uint8((RV*r + GV*g + BV*b + (257<<(RGB2YUV_SHIFT-1)))>>RGB2YUV_SHIFT);

  867.             c->pal_yuv[i]= y + (u<<8) + (v<<16);

  868. 

  869.             switch(c->dstFormat) {

  870.             case PIX_FMT_BGR32:

  871. #if !HAVE_BIGENDIAN

  872.             case PIX_FMT_RGB24:

  873. #endif

  874.                 c->pal_rgb[i]=  r + (g<<8) + (b<<16);

  875.                 break;

  876.             case PIX_FMT_BGR32_1:

  877. #if HAVE_BIGENDIAN

  878.             case PIX_FMT_BGR24:

  879. #endif

  880.                 c->pal_rgb[i]= (r + (g<<8) + (b<<16)) << 8;

  881.                 break;

  882.             case PIX_FMT_RGB32_1:

  883. #if HAVE_BIGENDIAN

  884.             case PIX_FMT_RGB24:

  885. #endif

  886.                 c->pal_rgb[i]= (b + (g<<8) + (r<<16)) << 8;

  887.                 break;

  888.             case PIX_FMT_RGB32:

  889. #if !HAVE_BIGENDIAN

  890.             case PIX_FMT_BGR24:

  891. #endif

  892.             default:

  893.                 c->pal_rgb[i]=  b + (g<<8) + (r<<16);

  894.             }

  895.         }

  896.     }

  897. 

  898.     // copy strides, so they can safely be modified

  899.     if (c->sliceDir == 1) {

  900.         // slices go from top to bottom

  901.         int srcStride2[4]= {srcStride[0], srcStride[1], srcStride[2], srcStride[3]};

  902.         int dstStride2[4]= {dstStride[0], dstStride[1], dstStride[2], dstStride[3]};

  903. 

  904.         reset_ptr(src2, c->srcFormat);

  905.         reset_ptr((const uint8_t**)dst2, c->dstFormat);

  906. 

  907.         /* reset slice direction at end of frame */

  908.         if (srcSliceY + srcSliceH == c->srcH)

  909.             c->sliceDir = 0;

  910. 

  911.         return c->swScale(c, src2, srcStride2, srcSliceY, srcSliceH, dst2, dstStride2);

  912.     } else {

  913.         // slices go from bottom to top => we flip the image internally

  914.         int srcStride2[4]= {-srcStride[0], -srcStride[1], -srcStride[2], -srcStride[3]};

  915.         int dstStride2[4]= {-dstStride[0], -dstStride[1], -dstStride[2], -dstStride[3]};

  916. 

  917.         src2[0] += (srcSliceH-1)*srcStride[0];

  918.         if (!usePal(c->srcFormat))

  919.             src2[1] += ((srcSliceH>>c->chrSrcVSubSample)-1)*srcStride[1];

  920.         src2[2] += ((srcSliceH>>c->chrSrcVSubSample)-1)*srcStride[2];

  921.         src2[3] += (srcSliceH-1)*srcStride[3];

  922.         dst2[0] += ( c->dstH                      -1)*dstStride[0];

  923.         dst2[1] += ((c->dstH>>c->chrDstVSubSample)-1)*dstStride[1];

  924.         dst2[2] += ((c->dstH>>c->chrDstVSubSample)-1)*dstStride[2];

  925.         dst2[3] += ( c->dstH                      -1)*dstStride[3];

  926. 

  927.         reset_ptr(src2, c->srcFormat);

  928.         reset_ptr((const uint8_t**)dst2, c->dstFormat);

  929. 

  930.         /* reset slice direction at end of frame */

  931.         if (!srcSliceY)

  932.             c->sliceDir = 0;

  933. 

  934.         return c->swScale(c, src2, srcStride2, c->srcH-srcSliceY-srcSliceH, srcSliceH, dst2, dstStride2);

  935.     }

  936. }

  937. 

  938. /* Convert the palette to the same packed 32-bit format as the palette */

  939. void sws_convertPalette8ToPacked32(const uint8_t *src, uint8_t *dst, int num_pixels, const uint8_t *palette)

  940. {

  941.     int i;

  942. 

  943.     for (i=0; i<num_pixels; i++)

  944.         ((uint32_t *) dst)[i] = ((const uint32_t *) palette)[src[i]];

  945. }

  946. 

  947. /* Palette format: ABCD -> dst format: ABC */

  948. void sws_convertPalette8ToPacked24(const uint8_t *src, uint8_t *dst, int num_pixels, const uint8_t *palette)

  949. {

  950.     int i;

  951. 

  952.     for (i=0; i<num_pixels; i++) {

  953.         //FIXME slow?

  954.         dst[0]= palette[src[i]*4+0];

  955.         dst[1]= palette[src[i]*4+1];

  956.         dst[2]= palette[src[i]*4+2];

  957.         dst+= 3;

  958.     }

  959. }