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FFmpeg/libswscale/swscale_unscaled.c

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  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 packed_16bpc_bswap(SwsContext *c, const uint8_t* src[],

  256.                               int srcStride[], int srcSliceY, int srcSliceH,

  257.                               uint8_t* dst[], int dstStride[])

  258. {

  259.     int i, j;

  260.     int srcstr = srcStride[0] >> 1;

  261.     int dststr = dstStride[0] >> 1;

  262.     uint16_t       *dstPtr =       (uint16_t *)dst[0];

  263.     const uint16_t *srcPtr = (const uint16_t *)src[0];

  264. 

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

  266.         for (j = 0; j < srcstr; j++) {

  267.             dstPtr[j] = av_bswap16(srcPtr[j]);

  268.         }

  269.         srcPtr += srcstr;

  270.         dstPtr += dststr;

  271.     }

  272. 

  273.     return srcSliceH;

  274. }

  275. 

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

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

  278. {

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

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

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

  282.                  const uint8_t *palette)=NULL;

  283.     int i;

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

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

  286. 

  287.     if (srcFormat == PIX_FMT_Y400A) {

  288.         switch (dstFormat) {

  289.         case PIX_FMT_RGB32  : conv = gray8aToPacked32; break;

  290.         case PIX_FMT_BGR32  : conv = gray8aToPacked32; break;

  291.         case PIX_FMT_BGR32_1: conv = gray8aToPacked32_1; break;

  292.         case PIX_FMT_RGB32_1: conv = gray8aToPacked32_1; break;

  293.         case PIX_FMT_RGB24  : conv = gray8aToPacked24; break;

  294.         case PIX_FMT_BGR24  : conv = gray8aToPacked24; break;

  295.         }

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

  297.         switch (dstFormat) {

  298.         case PIX_FMT_RGB32  : conv = sws_convertPalette8ToPacked32; break;

  299.         case PIX_FMT_BGR32  : conv = sws_convertPalette8ToPacked32; break;

  300.         case PIX_FMT_BGR32_1: conv = sws_convertPalette8ToPacked32; break;

  301.         case PIX_FMT_RGB32_1: conv = sws_convertPalette8ToPacked32; break;

  302.         case PIX_FMT_RGB24  : conv = sws_convertPalette8ToPacked24; break;

  303.         case PIX_FMT_BGR24  : conv = sws_convertPalette8ToPacked24; break;

  304.         }

  305.     }

  306. 

  307.     if (!conv)

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

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

  310.     else {

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

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

  313.             srcPtr+= srcStride[0];

  314.             dstPtr+= dstStride[0];

  315.         }

  316.     }

  317. 

  318.     return srcSliceH;

  319. }

  320. 

  321. #define isRGBA32(x) (            \

  322.            (x) == PIX_FMT_ARGB   \

  323.         || (x) == PIX_FMT_RGBA   \

  324.         || (x) == PIX_FMT_BGRA   \

  325.         || (x) == PIX_FMT_ABGR   \

  326.         )

  327. 

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

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

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

  331. {

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

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

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

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

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

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

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

  339. 

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

  341. 

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

  343.         if (     CONV_IS(ABGR, RGBA)

  344.               || CONV_IS(ARGB, BGRA)

  345.               || CONV_IS(BGRA, ARGB)

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

  347.         else if (CONV_IS(ABGR, ARGB)

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

  349.         else if (CONV_IS(ABGR, BGRA)

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

  351.         else if (CONV_IS(BGRA, RGBA)

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

  353.         else if (CONV_IS(BGRA, ABGR)

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

  355.     } else

  356.     /* BGR -> BGR */

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

  372.         }

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

  391.         }

  392.     }

  393. 

  394.     if (!conv) {

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

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

  397.     } else {

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

  399.               uint8_t *dstPtr= dst[0];

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

  401.             srcPtr += ALT32_CORR;

  402. 

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

  404.             dstPtr += ALT32_CORR;

  405. 

  406.         if (dstStride[0]*srcBpp == srcStride[0]*dstBpp && srcStride[0] > 0 && !(srcStride[0] % srcBpp))

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

  408.         else {

  409.             int i;

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

  411. 

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

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

  414.                 srcPtr+= srcStride[0];

  415.                 dstPtr+= dstStride[0];

  416.             }

  417.         }

  418.     }

  419.     return srcSliceH;

  420. }

  421. 

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

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

  424. {

  425.     rgb24toyv12(

  426.         src[0],

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

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

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

  430.         c->srcW, srcSliceH,

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

  432.     if (dst[3])

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

  434.     return srcSliceH;

  435. }

  436. 

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

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

  439. {

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

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

  442. 

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

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

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

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

  447.     if (dst[3])

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

  449.     return srcSliceH;

  450. }

  451. 

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

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

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

  455. {

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

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

  458.     else {

  459.         int i;

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

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

  462.         int length=0;

  463. 

  464.         /* universal length finder */

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

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

  467.         assert(length!=0);

  468. 

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

  470.             memcpy(dstPtr, srcPtr, length);

  471.             srcPtr+= srcStride[0];

  472.             dstPtr+= dstStride[0];

  473.         }

  474.     }

  475.     return srcSliceH;

  476. }

  477. 

  478. #define clip9(x)  av_clip_uintp2(x,  9)

  479. #define clip10(x) av_clip_uintp2(x, 10)

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

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

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

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

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

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

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

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

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

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

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

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

  492.         } \

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

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

  495.         dst += dstStride; \

  496.         src += srcStride; \

  497.     }

  498. 

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

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

  501. {

  502.     int plane, i, j;

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

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

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

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

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

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

  509. 

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

  511.         // ignore palette for GRAY8

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

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

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

  515.                 length*=2;

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

  517.         } else {

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

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

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

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

  522. 

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

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

  525. #define COPY9_OR_10TO16(rfunc, wfunc) \

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

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

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

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

  530.                         } \

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

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

  533.                     }

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

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

  536.                             COPY9_OR_10TO16(AV_RB16, AV_WB16);

  537.                         } else {

  538.                             COPY9_OR_10TO16(AV_RL16, AV_WB16);

  539.                         }

  540.                     } else {

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

  542.                             COPY9_OR_10TO16(AV_RB16, AV_WL16);

  543.                         } else {

  544.                             COPY9_OR_10TO16(AV_RL16, AV_WL16);

  545.                         }

  546.                     }

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

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

  549. #define COPY9_OR_10TO9_OR_10(loop) \

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

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

  552.                             loop; \

  553.                         } \

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

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

  556.                     }

  557. #define COPY9_OR_10TO9_OR_10_2(rfunc, wfunc) \

  558.                     if (dst_depth > src_depth) { \

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

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

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

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

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

  564.                                     dither_8x8_1, 1, clip9); \

  565.                     } else { \

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

  567.                     }

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

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

  570.                             COPY9_OR_10TO9_OR_10_2(AV_RB16, AV_WB16);

  571.                         } else {

  572.                             COPY9_OR_10TO9_OR_10_2(AV_RL16, AV_WB16);

  573.                         }

  574.                     } else {

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

  576.                             COPY9_OR_10TO9_OR_10_2(AV_RB16, AV_WL16);

  577.                         } else {

  578.                             COPY9_OR_10TO9_OR_10_2(AV_RL16, AV_WL16);

  579.                         }

  580.                     }

  581.                 } else {

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

  583. #define COPY9_OR_10TO8(rfunc) \

  584.                     if (src_depth == 9) { \

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

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

  587.                                     dither_8x8_1, 1, av_clip_uint8); \

  588.                     } else { \

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

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

  591.                                     dither_8x8_3, 2, av_clip_uint8); \

  592.                     }

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

  594.                         COPY9_OR_10TO8(AV_RB16);

  595.                     } else {

  596.                         COPY9_OR_10TO8(AV_RL16);

  597.                     }

  598.                 }

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

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

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

  602. 

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

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

  605. #define COPY16TO9_OR_10(rfunc, wfunc) \

  606.                     if (dst_depth == 9) { \

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

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

  609.                                     dither_8x8_128, 7, clip9); \

  610.                     } else { \

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

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

  613.                                     dither_8x8_64, 6, clip10); \

  614.                     }

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

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

  617.                             COPY16TO9_OR_10(AV_RB16, AV_WB16);

  618.                         } else {

  619.                             COPY16TO9_OR_10(AV_RL16, AV_WB16);

  620.                         }

  621.                     } else {

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

  623.                             COPY16TO9_OR_10(AV_RB16, AV_WL16);

  624.                         } else {

  625.                             COPY16TO9_OR_10(AV_RL16, AV_WL16);

  626.                         }

  627.                     }

  628.                 } else /* 8bit */ {

  629. #define COPY8TO9_OR_10(wfunc) \

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

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

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

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

  634.                         } \

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

  636.                         srcPtr  += srcStride[plane]; \

  637.                     }

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

  639.                         COPY8TO9_OR_10(AV_WB16);

  640.                     } else {

  641.                         COPY8TO9_OR_10(AV_WL16);

  642.                     }

  643.                 }

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

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

  646. #define COPY16TO8(rfunc) \

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

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

  649.                                 dither_8x8_256, 8, av_clip_uint8);

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

  651.                     COPY16TO8(AV_RB16);

  652.                 } else {

  653.                     COPY16TO8(AV_RL16);

  654.                 }

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

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

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

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

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

  660.                     }

  661.                     srcPtr+= srcStride[plane];

  662.                     dstPtr+= dstStride[plane];

  663.                 }

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

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

  666. 

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

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

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

  670.                     srcPtr+= srcStride[plane];

  671.                     dstPtr+= dstStride[plane];

  672.                 }

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

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

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

  676.                        height*dstStride[plane]);

  677.             } else {

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

  679.                     length*=2;

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

  681.                     memcpy(dstPtr, srcPtr, length);

  682.                     srcPtr+= srcStride[plane];

  683.                     dstPtr+= dstStride[plane];

  684.                 }

  685.             }

  686.         }

  687.     }

  688.     return srcSliceH;

  689. }

  690. 

  691. void ff_get_unscaled_swscale(SwsContext *c)

  692. {

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

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

  695.     const int flags = c->flags;

  696.     const int dstH = c->dstH;

  697.     int needsDither;

  698. 

  699.     needsDither= isAnyRGB(dstFormat)

  700.         &&  c->dstFormatBpp < 24

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

  702. 

  703.     /* yv12_to_nv12 */

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

  705.         c->swScale= planarToNv12Wrapper;

  706.     }

  707.     /* yuv2bgr */

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

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

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

  711.     }

  712. 

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

  714.         c->swScale= yvu9ToYv12Wrapper;

  715.     }

  716. 

  717.     /* bgr24toYV12 */

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

  719.         c->swScale= bgr24ToYv12Wrapper;

  720. 

  721.     /* bswap 16 bits per component packed formats */

  722.     if ((srcFormat == PIX_FMT_RGB48LE  && dstFormat == PIX_FMT_RGB48BE)  ||

  723.         (srcFormat == PIX_FMT_RGB48BE  && dstFormat == PIX_FMT_RGB48LE)  ||

  724.         (srcFormat == PIX_FMT_BGR48LE  && dstFormat == PIX_FMT_BGR48BE)  ||

  725.         (srcFormat == PIX_FMT_BGR48BE  && dstFormat == PIX_FMT_BGR48LE)  ||

  726.         (srcFormat == PIX_FMT_GRAY16LE && dstFormat == PIX_FMT_GRAY16BE) ||

  727.         (srcFormat == PIX_FMT_GRAY16BE && dstFormat == PIX_FMT_GRAY16LE))

  728.         c->swScale = packed_16bpc_bswap;

  729. 

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

  731.     if (   isAnyRGB(srcFormat)

  732.         && isAnyRGB(dstFormat)

  733.         && srcFormat != PIX_FMT_BGR8      && dstFormat != PIX_FMT_BGR8

  734.         && srcFormat != PIX_FMT_RGB8      && dstFormat != PIX_FMT_RGB8

  735.         && srcFormat != PIX_FMT_BGR4      && dstFormat != PIX_FMT_BGR4

  736.         && srcFormat != PIX_FMT_RGB4      && dstFormat != PIX_FMT_RGB4

  737.         && srcFormat != PIX_FMT_BGR4_BYTE && dstFormat != PIX_FMT_BGR4_BYTE

  738.         && srcFormat != PIX_FMT_RGB4_BYTE && dstFormat != PIX_FMT_RGB4_BYTE

  739.         && srcFormat != PIX_FMT_MONOBLACK && dstFormat != PIX_FMT_MONOBLACK

  740.         && srcFormat != PIX_FMT_MONOWHITE && dstFormat != PIX_FMT_MONOWHITE

  741.         && srcFormat != PIX_FMT_RGB48LE   && dstFormat != PIX_FMT_RGB48LE

  742.         && srcFormat != PIX_FMT_RGB48BE   && dstFormat != PIX_FMT_RGB48BE

  743.         && srcFormat != PIX_FMT_BGR48LE   && dstFormat != PIX_FMT_BGR48LE

  744.         && srcFormat != PIX_FMT_BGR48BE   && dstFormat != PIX_FMT_BGR48BE

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

  746.         c->swScale= rgbToRgbWrapper;

  747. 

  748.     if ((usePal(srcFormat) && (

  749.         dstFormat == PIX_FMT_RGB32   ||

  750.         dstFormat == PIX_FMT_RGB32_1 ||

  751.         dstFormat == PIX_FMT_RGB24   ||

  752.         dstFormat == PIX_FMT_BGR32   ||

  753.         dstFormat == PIX_FMT_BGR32_1 ||

  754.         dstFormat == PIX_FMT_BGR24)))

  755.         c->swScale= palToRgbWrapper;

  756. 

  757.     if (srcFormat == PIX_FMT_YUV422P) {

  758.         if (dstFormat == PIX_FMT_YUYV422)

  759.             c->swScale= yuv422pToYuy2Wrapper;

  760.         else if (dstFormat == PIX_FMT_UYVY422)

  761.             c->swScale= yuv422pToUyvyWrapper;

  762.     }

  763. 

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

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

  766.         /* yv12_to_yuy2 */

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

  768.             if (dstFormat == PIX_FMT_YUYV422)

  769.                 c->swScale= planarToYuy2Wrapper;

  770.             else if (dstFormat == PIX_FMT_UYVY422)

  771.                 c->swScale= planarToUyvyWrapper;

  772.         }

  773.     }

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

  775.         c->swScale= yuyvToYuv420Wrapper;

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

  777.         c->swScale= uyvyToYuv420Wrapper;

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

  779.         c->swScale= yuyvToYuv422Wrapper;

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

  781.         c->swScale= uyvyToYuv422Wrapper;

  782. 

  783.     /* simple copy */

  784.     if (  srcFormat == dstFormat

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

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

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

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

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

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

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

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

  793.             && dstFormat != PIX_FMT_NV12 && dstFormat != PIX_FMT_NV21

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

  795.     {

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

  797.             c->swScale= packedCopyWrapper;

  798.         else /* Planar YUV or gray */

  799.             c->swScale= planarCopyWrapper;

  800.     }

  801. 

  802.     if (ARCH_BFIN)

  803.         ff_bfin_get_unscaled_swscale(c);

  804.     if (HAVE_ALTIVEC)

  805.         ff_swscale_get_unscaled_altivec(c);

  806. }

  807. 

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

  809. {

  810.     if(!isALPHA(format))

  811.         src[3]=NULL;

  812.     if (!isPlanar(format)) {

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

  814. 

  815.         if (!usePal(format))

  816.             src[1]= NULL;

  817.     }

  818. }

  819. 

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

  821.                                 const int linesizes[4])

  822. {

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

  824.     int i;

  825. 

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

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

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

  829.             return 0;

  830.     }

  831. 

  832.     return 1;

  833. }

  834. 

  835. /**

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

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

  838.  */

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

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

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

  842. {

  843.     int i;

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

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

  846. 

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

  848.     if (srcSliceH == 0)

  849.         return 0;

  850. 

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

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

  853.         return 0;

  854.     }

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

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

  857.         return 0;

  858.     }

  859. 

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

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

  862.         return 0;

  863.     }

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

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

  866.     }

  867. 

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

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

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

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

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

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

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

  875.                 b=  p     &0xFF;

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

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

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

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

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

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

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

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

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

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

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

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

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

  889.                 r = g = b = i;

  890.             } else {

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

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

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

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

  895.             }

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

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

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

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

  900. 

  901.             switch(c->dstFormat) {

  902.             case PIX_FMT_BGR32:

  903. #if !HAVE_BIGENDIAN

  904.             case PIX_FMT_RGB24:

  905. #endif

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

  907.                 break;

  908.             case PIX_FMT_BGR32_1:

  909. #if HAVE_BIGENDIAN

  910.             case PIX_FMT_BGR24:

  911. #endif

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

  913.                 break;

  914.             case PIX_FMT_RGB32_1:

  915. #if HAVE_BIGENDIAN

  916.             case PIX_FMT_RGB24:

  917. #endif

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

  919.                 break;

  920.             case PIX_FMT_RGB32:

  921. #if !HAVE_BIGENDIAN

  922.             case PIX_FMT_BGR24:

  923. #endif

  924.             default:

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

  926.             }

  927.         }

  928.     }

  929. 

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

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

  932.         // slices go from top to bottom

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

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

  935. 

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

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

  938. 

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

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

  941.             c->sliceDir = 0;

  942. 

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

  944.     } else {

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

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

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

  948. 

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

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

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

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

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

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

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

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

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

  958. 

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

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

  961. 

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

  963.         if (!srcSliceY)

  964.             c->sliceDir = 0;

  965. 

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

  967.     }

  968. }

  969. 

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

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

  972. {

  973.     int i;

  974. 

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

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

  977. }

  978. 

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

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

  981. {

  982.     int i;

  983. 

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

  985.         //FIXME slow?

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

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

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

  989.         dst+= 3;

  990.     }

  991. }