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.
36093 Commits
32 Branches
444MB
Tree: 9f50dafe90
Branches Tags
${ item.name }
Create branch ${ searchTerm }
from '9f50dafe90'
${ noResults }
FFmpeg/libswscale/swscale_unscaled.c

1040 lines
40KB
Raw Blame History 

  1. /*

  2.  * Copyright (C) 2001-2011 Michael Niedermayer <michaelni@gmx.at>

  3.  *

  4.  * This file is part of FFmpeg.

  5.  *

  6.  * FFmpeg 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.  * FFmpeg 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 FFmpeg; 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. #define RGB2YUV_SHIFT 15

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

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

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

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

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

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

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

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

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

  47. 

  48. static void fillPlane(uint8_t *plane, int stride, int width, int height, int y,

  49.                       uint8_t val)

  50. {

  51.     int i;

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

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

  54.         memset(ptr, val, width);

  55.         ptr += stride;

  56.     }

  57. }

  58. 

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

  60.                       int srcSliceY, int srcSliceH, int width,

  61.                       uint8_t *dst, int dstStride)

  62. {

  63.     dst += dstStride * srcSliceY;

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

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

  66.     } else {

  67.         int i;

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

  69.             memcpy(dst, src, width);

  70.             src += srcStride;

  71.             dst += dstStride;

  72.         }

  73.     }

  74. }

  75. 

  76. static int planarToNv12Wrapper(SwsContext *c, const uint8_t *src[],

  77.                                int srcStride[], int srcSliceY,

  78.                                int srcSliceH, uint8_t *dstParam[],

  79.                                int dstStride[])

  80. {

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

  82. 

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

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

  85. 

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

  87.         interleaveBytes(src[1], src[2], dst, c->srcW / 2, srcSliceH / 2,

  88.                         srcStride[1], srcStride[2], dstStride[0]);

  89.     else

  90.         interleaveBytes(src[2], src[1], dst, c->srcW / 2, srcSliceH / 2,

  91.                         srcStride[2], srcStride[1], dstStride[0]);

  92. 

  93.     return srcSliceH;

  94. }

  95. 

  96. static int planarToYuy2Wrapper(SwsContext *c, const uint8_t *src[],

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

  98.                                uint8_t *dstParam[], int dstStride[])

  99. {

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

  101. 

  102.     yv12toyuy2(src[0], src[1], src[2], dst, c->srcW, srcSliceH, srcStride[0],

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

  104. 

  105.     return srcSliceH;

  106. }

  107. 

  108. static int planarToUyvyWrapper(SwsContext *c, const uint8_t *src[],

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

  110.                                uint8_t *dstParam[], int dstStride[])

  111. {

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

  113. 

  114.     yv12touyvy(src[0], src[1], src[2], dst, c->srcW, srcSliceH, srcStride[0],

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

  116. 

  117.     return srcSliceH;

  118. }

  119. 

  120. static int yuv422pToYuy2Wrapper(SwsContext *c, const uint8_t *src[],

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

  122.                                 uint8_t *dstParam[], int dstStride[])

  123. {

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

  125. 

  126.     yuv422ptoyuy2(src[0], src[1], src[2], dst, c->srcW, srcSliceH, srcStride[0],

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

  128. 

  129.     return srcSliceH;

  130. }

  131. 

  132. static int yuv422pToUyvyWrapper(SwsContext *c, const uint8_t *src[],

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

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

  135. {

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

  137. 

  138.     yuv422ptouyvy(src[0], src[1], src[2], dst, c->srcW, srcSliceH, srcStride[0],

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

  140. 

  141.     return srcSliceH;

  142. }

  143. 

  144. static int yuyvToYuv420Wrapper(SwsContext *c, const uint8_t *src[],

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

  146.                                uint8_t *dstParam[], int dstStride[])

  147. {

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

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

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

  151. 

  152.     yuyvtoyuv420(ydst, udst, vdst, src[0], c->srcW, srcSliceH, dstStride[0],

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

  154. 

  155.     if (dstParam[3])

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

  157. 

  158.     return srcSliceH;

  159. }

  160. 

  161. static int yuyvToYuv422Wrapper(SwsContext *c, const uint8_t *src[],

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

  163.                                uint8_t *dstParam[], int dstStride[])

  164. {

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

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

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

  168. 

  169.     yuyvtoyuv422(ydst, udst, vdst, src[0], c->srcW, srcSliceH, dstStride[0],

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

  171. 

  172.     return srcSliceH;

  173. }

  174. 

  175. static int uyvyToYuv420Wrapper(SwsContext *c, const uint8_t *src[],

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

  177.                                uint8_t *dstParam[], int dstStride[])

  178. {

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

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

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

  182. 

  183.     uyvytoyuv420(ydst, udst, vdst, src[0], c->srcW, srcSliceH, dstStride[0],

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

  185. 

  186.     if (dstParam[3])

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

  188. 

  189.     return srcSliceH;

  190. }

  191. 

  192. static int uyvyToYuv422Wrapper(SwsContext *c, const uint8_t *src[],

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

  194.                                uint8_t *dstParam[], int dstStride[])

  195. {

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

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

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

  199. 

  200.     uyvytoyuv422(ydst, udst, vdst, src[0], c->srcW, srcSliceH, dstStride[0],

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

  202. 

  203.     return srcSliceH;

  204. }

  205. 

  206. static void gray8aToPacked32(const uint8_t *src, uint8_t *dst, int num_pixels,

  207.                              const uint8_t *palette)

  208. {

  209.     int i;

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

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

  212. }

  213. 

  214. static void gray8aToPacked32_1(const uint8_t *src, uint8_t *dst, int num_pixels,

  215.                                const uint8_t *palette)

  216. {

  217.     int i;

  218. 

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

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

  221. }

  222. 

  223. static void gray8aToPacked24(const uint8_t *src, uint8_t *dst, int num_pixels,

  224.                              const uint8_t *palette)

  225. {

  226.     int i;

  227. 

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

  229.         //FIXME slow?

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

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

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

  233.         dst += 3;

  234.     }

  235. }

  236. 

  237. static int packed_16bpc_bswap(SwsContext *c, const uint8_t *src[],

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

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

  240. {

  241.     int i, j;

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

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

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

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

  246. 

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

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

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

  250.         }

  251.         srcPtr += srcstr;

  252.         dstPtr += dststr;

  253.     }

  254. 

  255.     return srcSliceH;

  256. }

  257. 

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

  259.                            int srcSliceY, int srcSliceH, uint8_t *dst[],

  260.                            int dstStride[])

  261. {

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

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

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

  265.                  const uint8_t *palette) = NULL;

  266.     int i;

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

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

  269. 

  270.     if (srcFormat == PIX_FMT_GRAY8A) {

  271.         switch (dstFormat) {

  272.         case PIX_FMT_RGB32  : conv = gray8aToPacked32; break;

  273.         case PIX_FMT_BGR32  : conv = gray8aToPacked32; break;

  274.         case PIX_FMT_BGR32_1: conv = gray8aToPacked32_1; break;

  275.         case PIX_FMT_RGB32_1: conv = gray8aToPacked32_1; break;

  276.         case PIX_FMT_RGB24  : conv = gray8aToPacked24; break;

  277.         case PIX_FMT_BGR24  : conv = gray8aToPacked24; break;

  278.         }

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

  280.         switch (dstFormat) {

  281.         case PIX_FMT_RGB32  : conv = sws_convertPalette8ToPacked32; break;

  282.         case PIX_FMT_BGR32  : conv = sws_convertPalette8ToPacked32; break;

  283.         case PIX_FMT_BGR32_1: conv = sws_convertPalette8ToPacked32; break;

  284.         case PIX_FMT_RGB32_1: conv = sws_convertPalette8ToPacked32; break;

  285.         case PIX_FMT_RGB24  : conv = sws_convertPalette8ToPacked24; break;

  286.         case PIX_FMT_BGR24  : conv = sws_convertPalette8ToPacked24; break;

  287.         }

  288.     }

  289. 

  290.     if (!conv)

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

  292.                av_get_pix_fmt_name(srcFormat), av_get_pix_fmt_name(dstFormat));

  293.     else {

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

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

  296.             srcPtr += srcStride[0];

  297.             dstPtr += dstStride[0];

  298.         }

  299.     }

  300. 

  301.     return srcSliceH;

  302. }

  303. 

  304. static void gbr24ptopacked24(const uint8_t* src[], int srcStride[], uint8_t* dst, int dstStride, int srcSliceH, int width)

  305. {

  306.     int x, h, i;

  307.     for (h = 0; h < srcSliceH; h++) {

  308.         uint8_t *dest = dst + dstStride * h;

  309.         for (x = 0; x < width; x++) {

  310.             *dest++ = src[0][x];

  311.             *dest++ = src[1][x];

  312.             *dest++ = src[2][x];

  313.         }

  314. 

  315.         for (i = 0; i < 3; i++)

  316.             src[i] += srcStride[i];

  317.     }

  318. }

  319. 

  320. static void gbr24ptopacked32(const uint8_t* src[], int srcStride[], uint8_t* dst, int dstStride, int srcSliceH, int alpha_first, int width)

  321. {

  322.     int x, h, i;

  323.     for (h = 0; h < srcSliceH; h++) {

  324.         uint8_t *dest = dst + dstStride * h;

  325. 

  326.         if (alpha_first) {

  327.             for (x = 0; x < width; x++) {

  328.                 *dest++ = 0xff;

  329.                 *dest++ = src[0][x];

  330.                 *dest++ = src[1][x];

  331.                 *dest++ = src[2][x];

  332.             }

  333.         } else {

  334.             for (x = 0; x < width; x++) {

  335.                 *dest++ = src[0][x];

  336.                 *dest++ = src[1][x];

  337.                 *dest++ = src[2][x];

  338.                 *dest++ = 0xff;

  339.             }

  340.         }

  341. 

  342.         for (i = 0; i < 3; i++)

  343.             src[i] += srcStride[i];

  344.     }

  345. }

  346. 

  347. static int planarRgbToRgbWrapper(SwsContext *c, const uint8_t* src[], int srcStride[], int srcSliceY,

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

  349. {

  350.     int alpha_first = 0;

  351.     if (c->srcFormat != PIX_FMT_GBR24P) {

  352.         av_log(c, AV_LOG_ERROR, "unsupported planar RGB conversion %s -> %s\n",

  353.               av_get_pix_fmt_name(c->srcFormat), av_get_pix_fmt_name(c->dstFormat));

  354.         return srcSliceH;

  355.     }

  356. 

  357.     switch (c->dstFormat) {

  358.         case PIX_FMT_BGR24:

  359.             gbr24ptopacked24((const uint8_t* []) {src[1], src[0], src[2]}, (int []) {srcStride[1], srcStride[0], srcStride[2]},

  360.                   dst[0] + srcSliceY * dstStride[0], dstStride[0], srcSliceH, c->srcW);

  361.             break;

  362. 

  363.         case PIX_FMT_RGB24:

  364.             gbr24ptopacked24((const uint8_t* []) {src[2], src[0], src[1]}, (int []) {srcStride[2], srcStride[0], srcStride[1]},

  365.                   dst[0] + srcSliceY * dstStride[0], dstStride[0], srcSliceH, c->srcW);

  366.             break;

  367. 

  368.         case PIX_FMT_ARGB:

  369.             alpha_first = 1;

  370.         case PIX_FMT_RGBA:

  371.             gbr24ptopacked32((const uint8_t* []) {src[2], src[0], src[1]}, (int []) {srcStride[2], srcStride[0], srcStride[1]},

  372.                   dst[0] + srcSliceY * dstStride[0], dstStride[0], srcSliceH, alpha_first, c->srcW);

  373.             break;

  374. 

  375.         case PIX_FMT_ABGR:

  376.             alpha_first = 1;

  377.         case PIX_FMT_BGRA:

  378.             gbr24ptopacked32((const uint8_t* []) {src[1], src[0], src[2]}, (int []) {srcStride[1], srcStride[0], srcStride[2]},

  379.                   dst[0] + srcSliceY * dstStride[0], dstStride[0], srcSliceH, alpha_first, c->srcW);

  380.             break;

  381. 

  382.         default:

  383.             av_log(c, AV_LOG_ERROR, "unsupported planar RGB conversion %s -> %s\n",

  384.                     av_get_pix_fmt_name(c->srcFormat), av_get_pix_fmt_name(c->dstFormat));

  385.     }

  386. 

  387.     return srcSliceH;

  388. }

  389. 

  390. #define isRGBA32(x) (            \

  391.            (x) == PIX_FMT_ARGB   \

  392.         || (x) == PIX_FMT_RGBA   \

  393.         || (x) == PIX_FMT_BGRA   \

  394.         || (x) == PIX_FMT_ABGR   \

  395.         )

  396. 

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

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

  399.                            int srcSliceY, int srcSliceH, uint8_t *dst[],

  400.                            int dstStride[])

  401. {

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

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

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

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

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

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

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

  409. 

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

  411. 

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

  413.         if (     CONV_IS(ABGR, RGBA)

  414.               || CONV_IS(ARGB, BGRA)

  415.               || CONV_IS(BGRA, ARGB)

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

  417.         else if (CONV_IS(ABGR, ARGB)

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

  419.         else if (CONV_IS(ABGR, BGRA)

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

  421.         else if (CONV_IS(BGRA, RGBA)

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

  423.         else if (CONV_IS(BGRA, ABGR)

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

  425.     } else

  426.     /* BGR -> BGR */

  427.     if ((isBGRinInt(srcFormat) && isBGRinInt(dstFormat)) ||

  428.         (isRGBinInt(srcFormat) && isRGBinInt(dstFormat))) {

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

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

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

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

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

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

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

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

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

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

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

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

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

  442.         }

  443.     } else if ((isBGRinInt(srcFormat) && isRGBinInt(dstFormat)) ||

  444.                (isRGBinInt(srcFormat) && isBGRinInt(dstFormat))) {

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

  461.         }

  462.     }

  463. 

  464.     if (!conv) {

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

  466.                av_get_pix_fmt_name(srcFormat), av_get_pix_fmt_name(dstFormat));

  467.     } else {

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

  469.               uint8_t *dstPtr = dst[0];

  470.         if ((srcFormat == PIX_FMT_RGB32_1 || srcFormat == PIX_FMT_BGR32_1) &&

  471.             !isRGBA32(dstFormat))

  472.             srcPtr += ALT32_CORR;

  473. 

  474.         if ((dstFormat == PIX_FMT_RGB32_1 || dstFormat == PIX_FMT_BGR32_1) &&

  475.             !isRGBA32(srcFormat))

  476.             dstPtr += ALT32_CORR;

  477. 

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

  479.             !(srcStride[0] % srcBpp))

  480.             conv(srcPtr, dstPtr + dstStride[0] * srcSliceY,

  481.                  srcSliceH * srcStride[0]);

  482.         else {

  483.             int i;

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

  485. 

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

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

  488.                 srcPtr += srcStride[0];

  489.                 dstPtr += dstStride[0];

  490.             }

  491.         }

  492.     }

  493.     return srcSliceH;

  494. }

  495. 

  496. static int bgr24ToYv12Wrapper(SwsContext *c, const uint8_t *src[],

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

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

  499. {

  500.     rgb24toyv12(

  501.         src[0],

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

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

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

  505.         c->srcW, srcSliceH,

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

  507.     if (dst[3])

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

  509.     return srcSliceH;

  510. }

  511. 

  512. static int yvu9ToYv12Wrapper(SwsContext *c, const uint8_t *src[],

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

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

  515. {

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

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

  518. 

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

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

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

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

  523.     if (dst[3])

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

  525.     return srcSliceH;

  526. }

  527. 

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

  529. static int packedCopyWrapper(SwsContext *c, const uint8_t *src[],

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

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

  532. {

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

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

  535.     else {

  536.         int i;

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

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

  539.         int length = 0;

  540. 

  541.         /* universal length finder */

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

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

  544.             length += c->srcW;

  545.         assert(length != 0);

  546. 

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

  548.             memcpy(dstPtr, srcPtr, length);

  549.             srcPtr += srcStride[0];

  550.             dstPtr += dstStride[0];

  551.         }

  552.     }

  553.     return srcSliceH;

  554. }

  555. 

  556. #define DITHER_COPY(dst, dstStride, src, srcStride, bswap, dbswap)\

  557.     uint16_t scale= dither_scale[dst_depth-1][src_depth-1];\

  558.     int shift= src_depth-dst_depth + dither_scale[src_depth-2][dst_depth-1];\

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

  560.         const uint8_t *dither= dithers[src_depth-9][i&7];\

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

  562.             dst[j+0] = dbswap((bswap(src[j+0]) + dither[0])*scale>>shift);\

  563.             dst[j+1] = dbswap((bswap(src[j+1]) + dither[1])*scale>>shift);\

  564.             dst[j+2] = dbswap((bswap(src[j+2]) + dither[2])*scale>>shift);\

  565.             dst[j+3] = dbswap((bswap(src[j+3]) + dither[3])*scale>>shift);\

  566.             dst[j+4] = dbswap((bswap(src[j+4]) + dither[4])*scale>>shift);\

  567.             dst[j+5] = dbswap((bswap(src[j+5]) + dither[5])*scale>>shift);\

  568.             dst[j+6] = dbswap((bswap(src[j+6]) + dither[6])*scale>>shift);\

  569.             dst[j+7] = dbswap((bswap(src[j+7]) + dither[7])*scale>>shift);\

  570.         }\

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

  572.             dst[j] = dbswap((bswap(src[j]) + dither[j&7])*scale>>shift);\

  573.         dst += dstStride;\

  574.         src += srcStride;\

  575.     }

  576. 

  577. static int planarCopyWrapper(SwsContext *c, const uint8_t *src[],

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

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

  580. {

  581.     int plane, i, j;

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

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

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

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

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

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

  588.         int shiftonly= plane==1 || plane==2 || (!c->srcRange && plane==0);

  589. 

  590.         if (!dst[plane])

  591.             continue;

  592.         // ignore palette for GRAY8

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

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

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

  596.                 length *= 2;

  597.             fillPlane(dst[plane], dstStride[plane], length, height, y,

  598.                       (plane == 3) ? 255 : 128);

  599.         } else {

  600.             if(isNBPS(c->srcFormat) || isNBPS(c->dstFormat)

  601.                || (is16BPS(c->srcFormat) != is16BPS(c->dstFormat))

  602.             ) {

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

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

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

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

  607. 

  608.                 if (dst_depth == 8) {

  609.                     if(isBE(c->srcFormat) == HAVE_BIGENDIAN){

  610.                         DITHER_COPY(dstPtr, dstStride[plane], srcPtr2, srcStride[plane]/2, , )

  611.                     } else {

  612.                         DITHER_COPY(dstPtr, dstStride[plane], srcPtr2, srcStride[plane]/2, av_bswap16, )

  613.                     }

  614.                 } else if (src_depth == 8) {

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

  616.                         #define COPY816(w)\

  617.                         if(shiftonly){\

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

  619.                                 w(&dstPtr2[j], srcPtr[j]<<(dst_depth-8));\

  620.                         }else{\

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

  622.                                 w(&dstPtr2[j], (srcPtr[j]<<(dst_depth-8)) |\

  623.                                                (srcPtr[j]>>(2*8-dst_depth)));\

  624.                         }

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

  626.                             COPY816(AV_WB16)

  627.                         } else {

  628.                             COPY816(AV_WL16)

  629.                         }

  630.                         dstPtr2 += dstStride[plane]/2;

  631.                         srcPtr  += srcStride[plane];

  632.                     }

  633.                 } else if (src_depth <= dst_depth) {

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

  635. #define COPY_UP(r,w) \

  636.     if(shiftonly){\

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

  638.             unsigned int v= r(&srcPtr2[j]);\

  639.             w(&dstPtr2[j], v<<(dst_depth-src_depth));\

  640.         }\

  641.     }else{\

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

  643.             unsigned int v= r(&srcPtr2[j]);\

  644.             w(&dstPtr2[j], (v<<(dst_depth-src_depth)) | \

  645.                         (v>>(2*src_depth-dst_depth)));\

  646.         }\

  647.     }

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

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

  650.                                 COPY_UP(AV_RB16, AV_WB16)

  651.                             } else {

  652.                                 COPY_UP(AV_RB16, AV_WL16)

  653.                             }

  654.                         } else {

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

  656.                                 COPY_UP(AV_RL16, AV_WB16)

  657.                             } else {

  658.                                 COPY_UP(AV_RL16, AV_WL16)

  659.                             }

  660.                         }

  661.                         dstPtr2 += dstStride[plane]/2;

  662.                         srcPtr2 += srcStride[plane]/2;

  663.                     }

  664.                 } else {

  665.                     if(isBE(c->srcFormat) == HAVE_BIGENDIAN){

  666.                         if(isBE(c->dstFormat) == HAVE_BIGENDIAN){

  667.                             DITHER_COPY(dstPtr2, dstStride[plane]/2, srcPtr2, srcStride[plane]/2, , )

  668.                         } else {

  669.                             DITHER_COPY(dstPtr2, dstStride[plane]/2, srcPtr2, srcStride[plane]/2, , av_bswap16)

  670.                         }

  671.                     }else{

  672.                         if(isBE(c->dstFormat) == HAVE_BIGENDIAN){

  673.                             DITHER_COPY(dstPtr2, dstStride[plane]/2, srcPtr2, srcStride[plane]/2, av_bswap16, )

  674.                         } else {

  675.                             DITHER_COPY(dstPtr2, dstStride[plane]/2, srcPtr2, srcStride[plane]/2, av_bswap16, av_bswap16)

  676.                         }

  677.                     }

  678.                 }

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

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

  681. 

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

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

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

  685.                     srcPtr += srcStride[plane];

  686.                     dstPtr += dstStride[plane];

  687.                 }

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

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

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

  691.                        height * dstStride[plane]);

  692.             } else {

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

  694.                     length *= 2;

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

  696.                     memcpy(dstPtr, srcPtr, length);

  697.                     srcPtr += srcStride[plane];

  698.                     dstPtr += dstStride[plane];

  699.                 }

  700.             }

  701.         }

  702.     }

  703.     return srcSliceH;

  704. }

  705. 

  706. 

  707. #define IS_DIFFERENT_ENDIANESS(src_fmt, dst_fmt, pix_fmt)          \

  708.     ((src_fmt == pix_fmt ## BE && dst_fmt == pix_fmt ## LE) ||     \

  709.      (src_fmt == pix_fmt ## LE && dst_fmt == pix_fmt ## BE))

  710. 

  711. 

  712. void ff_get_unscaled_swscale(SwsContext *c)

  713. {

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

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

  716.     const int flags = c->flags;

  717.     const int dstH = c->dstH;

  718.     int needsDither;

  719. 

  720.     needsDither = isAnyRGB(dstFormat) &&

  721.             c->dstFormatBpp < 24 &&

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

  723. 

  724.     /* yv12_to_nv12 */

  725.     if ((srcFormat == PIX_FMT_YUV420P || srcFormat == PIX_FMT_YUVA420P) &&

  726.         (dstFormat == PIX_FMT_NV12 || dstFormat == PIX_FMT_NV21)) {

  727.         c->swScale = planarToNv12Wrapper;

  728.     }

  729.     /* yuv2bgr */

  730.     if ((srcFormat == PIX_FMT_YUV420P || srcFormat == PIX_FMT_YUV422P ||

  731.          srcFormat == PIX_FMT_YUVA420P) && isAnyRGB(dstFormat) &&

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

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

  734.     }

  735. 

  736.     if (srcFormat == PIX_FMT_YUV410P &&

  737.         (dstFormat == PIX_FMT_YUV420P || dstFormat == PIX_FMT_YUVA420P) &&

  738.         !(flags & SWS_BITEXACT)) {

  739.         c->swScale = yvu9ToYv12Wrapper;

  740.     }

  741. 

  742.     /* bgr24toYV12 */

  743.     if (srcFormat == PIX_FMT_BGR24 &&

  744.         (dstFormat == PIX_FMT_YUV420P || dstFormat == PIX_FMT_YUVA420P) &&

  745.         !(flags & SWS_ACCURATE_RND))

  746.         c->swScale = bgr24ToYv12Wrapper;

  747. 

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

  749.     if (   isAnyRGB(srcFormat)

  750.         && isAnyRGB(dstFormat)

  751.         && srcFormat != PIX_FMT_BGR8      && dstFormat != PIX_FMT_BGR8

  752.         && srcFormat != PIX_FMT_RGB8      && dstFormat != PIX_FMT_RGB8

  753.         && srcFormat != PIX_FMT_BGR4      && dstFormat != PIX_FMT_BGR4

  754.         && srcFormat != PIX_FMT_RGB4      && dstFormat != PIX_FMT_RGB4

  755.         && srcFormat != PIX_FMT_BGR4_BYTE && dstFormat != PIX_FMT_BGR4_BYTE

  756.         && srcFormat != PIX_FMT_RGB4_BYTE && dstFormat != PIX_FMT_RGB4_BYTE

  757.         && srcFormat != PIX_FMT_MONOBLACK && dstFormat != PIX_FMT_MONOBLACK

  758.         && srcFormat != PIX_FMT_MONOWHITE && dstFormat != PIX_FMT_MONOWHITE

  759.         && srcFormat != PIX_FMT_RGB48LE   && dstFormat != PIX_FMT_RGB48LE

  760.         && srcFormat != PIX_FMT_RGB48BE   && dstFormat != PIX_FMT_RGB48BE

  761.         && srcFormat != PIX_FMT_BGR48LE   && dstFormat != PIX_FMT_BGR48LE

  762.         && srcFormat != PIX_FMT_BGR48BE   && dstFormat != PIX_FMT_BGR48BE

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

  764.         c->swScale= rgbToRgbWrapper;

  765. 

  766. #define isByteRGB(f) (\

  767.         f == PIX_FMT_RGB32   ||\

  768.         f == PIX_FMT_RGB32_1 ||\

  769.         f == PIX_FMT_RGB24   ||\

  770.         f == PIX_FMT_BGR32   ||\

  771.         f == PIX_FMT_BGR32_1 ||\

  772.         f == PIX_FMT_BGR24)

  773. 

  774.     if (isAnyRGB(srcFormat) && isPlanar(srcFormat) && isByteRGB(dstFormat))

  775.         c->swScale= planarRgbToRgbWrapper;

  776. 

  777.     /* bswap 16 bits per pixel/component packed formats */

  778.     if (IS_DIFFERENT_ENDIANESS(srcFormat, dstFormat, PIX_FMT_BGR444) ||

  779.         IS_DIFFERENT_ENDIANESS(srcFormat, dstFormat, PIX_FMT_BGR48)  ||

  780.         IS_DIFFERENT_ENDIANESS(srcFormat, dstFormat, PIX_FMT_BGR555) ||

  781.         IS_DIFFERENT_ENDIANESS(srcFormat, dstFormat, PIX_FMT_BGR565) ||

  782.         IS_DIFFERENT_ENDIANESS(srcFormat, dstFormat, PIX_FMT_GRAY16) ||

  783.         IS_DIFFERENT_ENDIANESS(srcFormat, dstFormat, PIX_FMT_RGB444) ||

  784.         IS_DIFFERENT_ENDIANESS(srcFormat, dstFormat, PIX_FMT_RGB48)  ||

  785.         IS_DIFFERENT_ENDIANESS(srcFormat, dstFormat, PIX_FMT_RGB555) ||

  786.         IS_DIFFERENT_ENDIANESS(srcFormat, dstFormat, PIX_FMT_RGB565))

  787.         c->swScale = packed_16bpc_bswap;

  788. 

  789.     if (usePal(srcFormat) && isByteRGB(dstFormat))

  790.         c->swScale = palToRgbWrapper;

  791. 

  792.     if (srcFormat == PIX_FMT_YUV422P) {

  793.         if (dstFormat == PIX_FMT_YUYV422)

  794.             c->swScale = yuv422pToYuy2Wrapper;

  795.         else if (dstFormat == PIX_FMT_UYVY422)

  796.             c->swScale = yuv422pToUyvyWrapper;

  797.     }

  798. 

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

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

  801.         /* yv12_to_yuy2 */

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

  803.             if (dstFormat == PIX_FMT_YUYV422)

  804.                 c->swScale = planarToYuy2Wrapper;

  805.             else if (dstFormat == PIX_FMT_UYVY422)

  806.                 c->swScale = planarToUyvyWrapper;

  807.         }

  808.     }

  809.     if (srcFormat == PIX_FMT_YUYV422 &&

  810.        (dstFormat == PIX_FMT_YUV420P || dstFormat == PIX_FMT_YUVA420P))

  811.         c->swScale = yuyvToYuv420Wrapper;

  812.     if (srcFormat == PIX_FMT_UYVY422 &&

  813.        (dstFormat == PIX_FMT_YUV420P || dstFormat == PIX_FMT_YUVA420P))

  814.         c->swScale = uyvyToYuv420Wrapper;

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

  816.         c->swScale = yuyvToYuv422Wrapper;

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

  818.         c->swScale = uyvyToYuv422Wrapper;

  819. 

  820.     /* simple copy */

  821.     if ( srcFormat == dstFormat ||

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

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

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

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

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

  827.         (isPlanarYUV(srcFormat) && isPlanarYUV(dstFormat) &&

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

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

  830.          dstFormat != PIX_FMT_NV12 && dstFormat != PIX_FMT_NV21 &&

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

  832.     {

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

  834.             c->swScale = packedCopyWrapper;

  835.         else /* Planar YUV or gray */

  836.             c->swScale = planarCopyWrapper;

  837.     }

  838. 

  839.     if (ARCH_BFIN)

  840.         ff_bfin_get_unscaled_swscale(c);

  841.     if (HAVE_ALTIVEC)

  842.         ff_swscale_get_unscaled_altivec(c);

  843. }

  844. 

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

  846. {

  847.     if (!isALPHA(format))

  848.         src[3] = NULL;

  849.     if (!isPlanar(format)) {

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

  851. 

  852.         if (!usePal(format))

  853.             src[1] = NULL;

  854.     }

  855. }

  856. 

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

  858.                                 const int linesizes[4])

  859. {

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

  861.     int i;

  862. 

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

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

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

  866.             return 0;

  867.     }

  868. 

  869.     return 1;

  870. }

  871. 

  872. /**

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

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

  875.  */

  876. int attribute_align_arg sws_scale(struct SwsContext *c,

  877.                                   const uint8_t * const srcSlice[],

  878.                                   const int srcStride[], int srcSliceY,

  879.                                   int srcSliceH, uint8_t *const dst[],

  880.                                   const int dstStride[])

  881. {

  882.     int i;

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

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

  885. 

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

  887.     if (srcSliceH == 0)

  888.         return 0;

  889. 

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

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

  892.         return 0;

  893.     }

  894.     if (!check_image_pointers((const uint8_t* const*)dst, c->dstFormat, dstStride)) {

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

  896.         return 0;

  897.     }

  898. 

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

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

  901.         return 0;

  902.     }

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

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

  905.     }

  906. 

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

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

  909.             int p, r, g, b, y, u, v, a = 0xff;

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

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

  912.                 a = (p >> 24) & 0xFF;

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

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

  915.                 b =  p        & 0xFF;

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

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

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

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

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

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

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

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

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

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

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

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

  928.             } else if (c->srcFormat == PIX_FMT_GRAY8 || c->srcFormat == PIX_FMT_GRAY8A) {

  929.                 r = g = b = i;

  930.             } else {

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

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

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

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

  935.             }

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

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

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

  939.             c->pal_yuv[i]= y + (u<<8) + (v<<16) + (a<<24);

  940. 

  941.             switch (c->dstFormat) {

  942.             case PIX_FMT_BGR32:

  943. #if !HAVE_BIGENDIAN

  944.             case PIX_FMT_RGB24:

  945. #endif

  946.                 c->pal_rgb[i]=  r + (g<<8) + (b<<16) + (a<<24);

  947.                 break;

  948.             case PIX_FMT_BGR32_1:

  949. #if HAVE_BIGENDIAN

  950.             case PIX_FMT_BGR24:

  951. #endif

  952.                 c->pal_rgb[i]= a + (r<<8) + (g<<16) + (b<<24);

  953.                 break;

  954.             case PIX_FMT_RGB32_1:

  955. #if HAVE_BIGENDIAN

  956.             case PIX_FMT_RGB24:

  957. #endif

  958.                 c->pal_rgb[i]= a + (b<<8) + (g<<16) + (r<<24);

  959.                 break;

  960.             case PIX_FMT_RGB32:

  961. #if !HAVE_BIGENDIAN

  962.             case PIX_FMT_BGR24:

  963. #endif

  964.             default:

  965.                 c->pal_rgb[i]=  b + (g<<8) + (r<<16) + (a<<24);

  966.             }

  967.         }

  968.     }

  969. 

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

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

  972.         // slices go from top to bottom

  973.         int srcStride2[4] = { srcStride[0], srcStride[1], srcStride[2],

  974.                               srcStride[3] };

  975.         int dstStride2[4] = { dstStride[0], dstStride[1], dstStride[2],

  976.                               dstStride[3] };

  977. 

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

  979.         reset_ptr((void*)dst2, c->dstFormat);

  980. 

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

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

  983.             c->sliceDir = 0;

  984. 

  985.         return c->swScale(c, src2, srcStride2, srcSliceY, srcSliceH, dst2,

  986.                           dstStride2);

  987.     } else {

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

  989.         int srcStride2[4] = { -srcStride[0], -srcStride[1], -srcStride[2],

  990.                               -srcStride[3] };

  991.         int dstStride2[4] = { -dstStride[0], -dstStride[1], -dstStride[2],

  992.                               -dstStride[3] };

  993. 

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

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

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

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

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

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

  1000.         dst2[1] += ((c->dstH >> c->chrDstVSubSample) - 1) * dstStride[1];

  1001.         dst2[2] += ((c->dstH >> c->chrDstVSubSample) - 1) * dstStride[2];

  1002.         dst2[3] += ( c->dstH                         - 1) * dstStride[3];

  1003. 

  1004.         reset_ptr(src2, c->srcFormat);

  1005.         reset_ptr((void*)dst2, c->dstFormat);

  1006. 

  1007.         /* reset slice direction at end of frame */

  1008.         if (!srcSliceY)

  1009.             c->sliceDir = 0;

  1010. 

  1011.         return c->swScale(c, src2, srcStride2, c->srcH-srcSliceY-srcSliceH,

  1012.                           srcSliceH, dst2, dstStride2);

  1013.     }

  1014. }

  1015. 

  1016. /* Convert the palette to the same packed 32-bit format as the palette */

  1017. void sws_convertPalette8ToPacked32(const uint8_t *src, uint8_t *dst,

  1018.                                    int num_pixels, const uint8_t *palette)

  1019. {

  1020.     int i;

  1021. 

  1022.     for (i = 0; i < num_pixels; i++)

  1023.         ((uint32_t *) dst)[i] = ((const uint32_t *) palette)[src[i]];

  1024. }

  1025. 

  1026. /* Palette format: ABCD -> dst format: ABC */

  1027. void sws_convertPalette8ToPacked24(const uint8_t *src, uint8_t *dst,

  1028.                                    int num_pixels, const uint8_t *palette)

  1029. {

  1030.     int i;

  1031. 

  1032.     for (i = 0; i < num_pixels; i++) {

  1033.         //FIXME slow?

  1034.         dst[0] = palette[src[i] * 4 + 0];

  1035.         dst[1] = palette[src[i] * 4 + 1];

  1036.         dst[2] = palette[src[i] * 4 + 2];

  1037.         dst += 3;

  1038.     }

  1039. }