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FFmpeg/libswscale/swscale_unscaled.c

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  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.     int min_stride         = FFMIN(srcstr, dststr);

  247. 

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

  249.         for (j = 0; j < min_stride; j++) {

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

  251.         }

  252.         srcPtr += srcstr;

  253.         dstPtr += dststr;

  254.     }

  255. 

  256.     return srcSliceH;

  257. }

  258. 

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

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

  261.                            int dstStride[])

  262. {

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

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

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

  266.                  const uint8_t *palette) = NULL;

  267.     int i;

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

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

  270. 

  271.     if (srcFormat == PIX_FMT_GRAY8A) {

  272.         switch (dstFormat) {

  273.         case PIX_FMT_RGB32  : conv = gray8aToPacked32; break;

  274.         case PIX_FMT_BGR32  : conv = gray8aToPacked32; break;

  275.         case PIX_FMT_BGR32_1: conv = gray8aToPacked32_1; break;

  276.         case PIX_FMT_RGB32_1: conv = gray8aToPacked32_1; break;

  277.         case PIX_FMT_RGB24  : conv = gray8aToPacked24; break;

  278.         case PIX_FMT_BGR24  : conv = gray8aToPacked24; break;

  279.         }

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

  281.         switch (dstFormat) {

  282.         case PIX_FMT_RGB32  : conv = sws_convertPalette8ToPacked32; break;

  283.         case PIX_FMT_BGR32  : conv = sws_convertPalette8ToPacked32; break;

  284.         case PIX_FMT_BGR32_1: conv = sws_convertPalette8ToPacked32; break;

  285.         case PIX_FMT_RGB32_1: conv = sws_convertPalette8ToPacked32; break;

  286.         case PIX_FMT_RGB24  : conv = sws_convertPalette8ToPacked24; break;

  287.         case PIX_FMT_BGR24  : conv = sws_convertPalette8ToPacked24; break;

  288.         }

  289.     }

  290. 

  291.     if (!conv)

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

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

  294.     else {

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

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

  297.             srcPtr += srcStride[0];

  298.             dstPtr += dstStride[0];

  299.         }

  300.     }

  301. 

  302.     return srcSliceH;

  303. }

  304. 

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

  306. {

  307.     int x, h, i;

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

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

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

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

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

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

  314.         }

  315. 

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

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

  318.     }

  319. }

  320. 

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

  322. {

  323.     int x, h, i;

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

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

  326. 

  327.         if (alpha_first) {

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

  329.                 *dest++ = 0xff;

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

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

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

  333.             }

  334.         } else {

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

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

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

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

  339.                 *dest++ = 0xff;

  340.             }

  341.         }

  342. 

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

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

  345.     }

  346. }

  347. 

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

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

  350. {

  351.     int alpha_first = 0;

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

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

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

  355.         return srcSliceH;

  356.     }

  357. 

  358.     switch (c->dstFormat) {

  359.         case PIX_FMT_BGR24:

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

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

  362.             break;

  363. 

  364.         case PIX_FMT_RGB24:

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

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

  367.             break;

  368. 

  369.         case PIX_FMT_ARGB:

  370.             alpha_first = 1;

  371.         case PIX_FMT_RGBA:

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

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

  374.             break;

  375. 

  376.         case PIX_FMT_ABGR:

  377.             alpha_first = 1;

  378.         case PIX_FMT_BGRA:

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

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

  381.             break;

  382. 

  383.         default:

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

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

  386.     }

  387. 

  388.     return srcSliceH;

  389. }

  390. 

  391. #define isRGBA32(x) (            \

  392.            (x) == PIX_FMT_ARGB   \

  393.         || (x) == PIX_FMT_RGBA   \

  394.         || (x) == PIX_FMT_BGRA   \

  395.         || (x) == PIX_FMT_ABGR   \

  396.         )

  397. 

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

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

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

  401.                            int dstStride[])

  402. {

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

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

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

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

  407.     const int srcId = c->srcFormatBpp;

  408.     const int dstId = c->dstFormatBpp;

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

  410. 

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

  412. 

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

  414.         if (     CONV_IS(ABGR, RGBA)

  415.               || CONV_IS(ARGB, BGRA)

  416.               || CONV_IS(BGRA, ARGB)

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

  418.         else if (CONV_IS(ABGR, ARGB)

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

  420.         else if (CONV_IS(ABGR, BGRA)

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

  422.         else if (CONV_IS(BGRA, RGBA)

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

  424.         else if (CONV_IS(BGRA, ABGR)

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

  426.     } else

  427.     /* BGR -> BGR */

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

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

  430.         switch (srcId | (dstId << 16)) {

  431.         case 0x000F0010: conv = rgb16to15; break;

  432.         case 0x000F0018: conv = rgb24to15; break;

  433.         case 0x000F0020: conv = rgb32to15; break;

  434.         case 0x0010000F: conv = rgb15to16; break;

  435.         case 0x00100018: conv = rgb24to16; break;

  436.         case 0x00100020: conv = rgb32to16; break;

  437.         case 0x0018000F: conv = rgb15to24; break;

  438.         case 0x00180010: conv = rgb16to24; break;

  439.         case 0x00180020: conv = rgb32to24; break;

  440.         case 0x0020000F: conv = rgb15to32; break;

  441.         case 0x00200010: conv = rgb16to32; break;

  442.         case 0x00200018: conv = rgb24to32; break;

  443.         }

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

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

  446.         switch (srcId | (dstId << 16)) {

  447.         case 0x000C000C: conv = rgb12tobgr12; break;

  448.         case 0x000F000F: conv = rgb15tobgr15; break;

  449.         case 0x000F0010: conv = rgb16tobgr15; break;

  450.         case 0x000F0018: conv = rgb24tobgr15; break;

  451.         case 0x000F0020: conv = rgb32tobgr15; break;

  452.         case 0x0010000F: conv = rgb15tobgr16; break;

  453.         case 0x00100010: conv = rgb16tobgr16; break;

  454.         case 0x00100018: conv = rgb24tobgr16; break;

  455.         case 0x00100020: conv = rgb32tobgr16; break;

  456.         case 0x0018000F: conv = rgb15tobgr24; break;

  457.         case 0x00180010: conv = rgb16tobgr24; break;

  458.         case 0x00180018: conv = rgb24tobgr24; break;

  459.         case 0x00180020: conv = rgb32tobgr24; break;

  460.         case 0x0020000F: conv = rgb15tobgr32; break;

  461.         case 0x00200010: conv = rgb16tobgr32; break;

  462.         case 0x00200018: conv = rgb24tobgr32; break;

  463.         }

  464.     }

  465. 

  466.     if (!conv) {

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

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

  469.     } else {

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

  471.               uint8_t *dstPtr = dst[0];

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

  473.             !isRGBA32(dstFormat))

  474.             srcPtr += ALT32_CORR;

  475. 

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

  477.             !isRGBA32(srcFormat))

  478.             dstPtr += ALT32_CORR;

  479. 

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

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

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

  483.                  srcSliceH * srcStride[0]);

  484.         else {

  485.             int i;

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

  487. 

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

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

  490.                 srcPtr += srcStride[0];

  491.                 dstPtr += dstStride[0];

  492.             }

  493.         }

  494.     }

  495.     return srcSliceH;

  496. }

  497. 

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

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

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

  501. {

  502.     rgb24toyv12(

  503.         src[0],

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

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

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

  507.         c->srcW, srcSliceH,

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

  509.     if (dst[3])

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

  511.     return srcSliceH;

  512. }

  513. 

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

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

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

  517. {

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

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

  520. 

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

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

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

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

  525.     if (dst[3])

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

  527.     return srcSliceH;

  528. }

  529. 

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

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

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

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

  534. {

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

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

  537.     else {

  538.         int i;

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

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

  541.         int length = 0;

  542. 

  543.         /* universal length finder */

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

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

  546.             length += c->srcW;

  547.         assert(length != 0);

  548. 

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

  550.             memcpy(dstPtr, srcPtr, length);

  551.             srcPtr += srcStride[0];

  552.             dstPtr += dstStride[0];

  553.         }

  554.     }

  555.     return srcSliceH;

  556. }

  557. 

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

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

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

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

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

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

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

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

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

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

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

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

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

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

  572.         }\

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

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

  575.         dst += dstStride;\

  576.         src += srcStride;\

  577.     }

  578. 

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

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

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

  582. {

  583.     int plane, i, j;

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

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

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

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

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

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

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

  591. 

  592.         if (!dst[plane])

  593.             continue;

  594.         // ignore palette for GRAY8

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

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

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

  598.                 length *= 2;

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

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

  601.         } else {

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

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

  604.             ) {

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

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

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

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

  609. 

  610.                 if (dst_depth == 8) {

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

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

  613.                     } else {

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

  615.                     }

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

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

  618.                         #define COPY816(w)\

  619.                         if(shiftonly){\

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

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

  622.                         }else{\

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

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

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

  626.                         }

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

  628.                             COPY816(AV_WB16)

  629.                         } else {

  630.                             COPY816(AV_WL16)

  631.                         }

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

  633.                         srcPtr  += srcStride[plane];

  634.                     }

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

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

  637. #define COPY_UP(r,w) \

  638.     if(shiftonly){\

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

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

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

  642.         }\

  643.     }else{\

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

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

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

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

  648.         }\

  649.     }

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

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

  652.                                 COPY_UP(AV_RB16, AV_WB16)

  653.                             } else {

  654.                                 COPY_UP(AV_RB16, AV_WL16)

  655.                             }

  656.                         } else {

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

  658.                                 COPY_UP(AV_RL16, AV_WB16)

  659.                             } else {

  660.                                 COPY_UP(AV_RL16, AV_WL16)

  661.                             }

  662.                         }

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

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

  665.                     }

  666.                 } else {

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

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

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

  670.                         } else {

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

  672.                         }

  673.                     }else{

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

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

  676.                         } else {

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

  678.                         }

  679.                     }

  680.                 }

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

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

  683. 

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

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

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

  687.                     srcPtr += srcStride[plane];

  688.                     dstPtr += dstStride[plane];

  689.                 }

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

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

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

  693.                        height * dstStride[plane]);

  694.             } else {

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

  696.                     length *= 2;

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

  698.                     memcpy(dstPtr, srcPtr, length);

  699.                     srcPtr += srcStride[plane];

  700.                     dstPtr += dstStride[plane];

  701.                 }

  702.             }

  703.         }

  704.     }

  705.     return srcSliceH;

  706. }

  707. 

  708. 

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

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

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

  712. 

  713. 

  714. void ff_get_unscaled_swscale(SwsContext *c)

  715. {

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

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

  718.     const int flags = c->flags;

  719.     const int dstH = c->dstH;

  720.     int needsDither;

  721. 

  722.     needsDither = isAnyRGB(dstFormat) &&

  723.             c->dstFormatBpp < 24 &&

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

  725. 

  726.     /* yv12_to_nv12 */

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

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

  729.         c->swScale = planarToNv12Wrapper;

  730.     }

  731.     /* yuv2bgr */

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

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

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

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

  736.     }

  737. 

  738.     if (srcFormat == PIX_FMT_YUV410P &&

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

  740.         !(flags & SWS_BITEXACT)) {

  741.         c->swScale = yvu9ToYv12Wrapper;

  742.     }

  743. 

  744.     /* bgr24toYV12 */

  745.     if (srcFormat == PIX_FMT_BGR24 &&

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

  747.         !(flags & SWS_ACCURATE_RND))

  748.         c->swScale = bgr24ToYv12Wrapper;

  749. 

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

  751.     if (   isAnyRGB(srcFormat)

  752.         && isAnyRGB(dstFormat)

  753.         && srcFormat != PIX_FMT_BGR8      && dstFormat != PIX_FMT_BGR8

  754.         && srcFormat != PIX_FMT_RGB8      && dstFormat != PIX_FMT_RGB8

  755.         && srcFormat != PIX_FMT_BGR4      && dstFormat != PIX_FMT_BGR4

  756.         && srcFormat != PIX_FMT_RGB4      && dstFormat != PIX_FMT_RGB4

  757.         && srcFormat != PIX_FMT_BGR4_BYTE && dstFormat != PIX_FMT_BGR4_BYTE

  758.         && srcFormat != PIX_FMT_RGB4_BYTE && dstFormat != PIX_FMT_RGB4_BYTE

  759.         && srcFormat != PIX_FMT_MONOBLACK && dstFormat != PIX_FMT_MONOBLACK

  760.         && srcFormat != PIX_FMT_MONOWHITE && dstFormat != PIX_FMT_MONOWHITE

  761.         && srcFormat != PIX_FMT_RGB48LE   && dstFormat != PIX_FMT_RGB48LE

  762.         && srcFormat != PIX_FMT_RGB48BE   && dstFormat != PIX_FMT_RGB48BE

  763.         && srcFormat != PIX_FMT_BGR48LE   && dstFormat != PIX_FMT_BGR48LE

  764.         && srcFormat != PIX_FMT_BGR48BE   && dstFormat != PIX_FMT_BGR48BE

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

  766.         && (!(av_pix_fmt_descriptors[srcFormat].flags & PIX_FMT_BE) == !HAVE_BIGENDIAN || (c->srcFormatBpp+7)/8!=2)

  767.         && (!(av_pix_fmt_descriptors[dstFormat].flags & PIX_FMT_BE) == !HAVE_BIGENDIAN || (c->dstFormatBpp+7)/8!=2)

  768.     )

  769.         c->swScale= rgbToRgbWrapper;

  770. 

  771. #define isByteRGB(f) (\

  772.         f == PIX_FMT_RGB32   ||\

  773.         f == PIX_FMT_RGB32_1 ||\

  774.         f == PIX_FMT_RGB24   ||\

  775.         f == PIX_FMT_BGR32   ||\

  776.         f == PIX_FMT_BGR32_1 ||\

  777.         f == PIX_FMT_BGR24)

  778. 

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

  780.         c->swScale= planarRgbToRgbWrapper;

  781. 

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

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

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

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

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

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

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

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

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

  791.         IS_DIFFERENT_ENDIANESS(srcFormat, dstFormat, PIX_FMT_RGB565))

  792.         c->swScale = packed_16bpc_bswap;

  793. 

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

  795.         c->swScale = palToRgbWrapper;

  796. 

  797.     if (srcFormat == PIX_FMT_YUV422P) {

  798.         if (dstFormat == PIX_FMT_YUYV422)

  799.             c->swScale = yuv422pToYuy2Wrapper;

  800.         else if (dstFormat == PIX_FMT_UYVY422)

  801.             c->swScale = yuv422pToUyvyWrapper;

  802.     }

  803. 

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

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

  806.         /* yv12_to_yuy2 */

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

  808.             if (dstFormat == PIX_FMT_YUYV422)

  809.                 c->swScale = planarToYuy2Wrapper;

  810.             else if (dstFormat == PIX_FMT_UYVY422)

  811.                 c->swScale = planarToUyvyWrapper;

  812.         }

  813.     }

  814.     if (srcFormat == PIX_FMT_YUYV422 &&

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

  816.         c->swScale = yuyvToYuv420Wrapper;

  817.     if (srcFormat == PIX_FMT_UYVY422 &&

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

  819.         c->swScale = uyvyToYuv420Wrapper;

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

  821.         c->swScale = yuyvToYuv422Wrapper;

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

  823.         c->swScale = uyvyToYuv422Wrapper;

  824. 

  825.     /* simple copy */

  826.     if ( srcFormat == dstFormat ||

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

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

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

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

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

  832.         (isPlanarYUV(srcFormat) && isPlanarYUV(dstFormat) &&

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

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

  835.          dstFormat != PIX_FMT_NV12 && dstFormat != PIX_FMT_NV21 &&

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

  837.     {

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

  839.             c->swScale = packedCopyWrapper;

  840.         else /* Planar YUV or gray */

  841.             c->swScale = planarCopyWrapper;

  842.     }

  843. 

  844.     if (ARCH_BFIN)

  845.         ff_bfin_get_unscaled_swscale(c);

  846.     if (HAVE_ALTIVEC)

  847.         ff_swscale_get_unscaled_altivec(c);

  848. }

  849. 

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

  851. {

  852.     if (!isALPHA(format))

  853.         src[3] = NULL;

  854.     if (!isPlanar(format)) {

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

  856. 

  857.         if (!usePal(format))

  858.             src[1] = NULL;

  859.     }

  860. }

  861. 

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

  863.                                 const int linesizes[4])

  864. {

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

  866.     int i;

  867. 

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

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

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

  871.             return 0;

  872.     }

  873. 

  874.     return 1;

  875. }

  876. 

  877. /**

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

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

  880.  */

  881. int attribute_align_arg sws_scale(struct SwsContext *c,

  882.                                   const uint8_t * const srcSlice[],

  883.                                   const int srcStride[], int srcSliceY,

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

  885.                                   const int dstStride[])

  886. {

  887.     int i;

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

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

  890. 

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

  892.     if (srcSliceH == 0)

  893.         return 0;

  894. 

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

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

  897.         return 0;

  898.     }

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

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

  901.         return 0;

  902.     }

  903. 

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

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

  906.         return 0;

  907.     }

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

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

  910.     }

  911. 

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

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

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

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

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

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

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

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

  920.                 b =  p        & 0xFF;

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

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

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

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

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

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

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

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

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

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

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

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

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

  934.                 r = g = b = i;

  935.             } else {

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

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

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

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

  940.             }

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

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

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

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

  945. 

  946.             switch (c->dstFormat) {

  947.             case PIX_FMT_BGR32:

  948. #if !HAVE_BIGENDIAN

  949.             case PIX_FMT_RGB24:

  950. #endif

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

  952.                 break;

  953.             case PIX_FMT_BGR32_1:

  954. #if HAVE_BIGENDIAN

  955.             case PIX_FMT_BGR24:

  956. #endif

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

  958.                 break;

  959.             case PIX_FMT_RGB32_1:

  960. #if HAVE_BIGENDIAN

  961.             case PIX_FMT_RGB24:

  962. #endif

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

  964.                 break;

  965.             case PIX_FMT_RGB32:

  966. #if !HAVE_BIGENDIAN

  967.             case PIX_FMT_BGR24:

  968. #endif

  969.             default:

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

  971.             }

  972.         }

  973.     }

  974. 

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

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

  977.         // slices go from top to bottom

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

  979.                               srcStride[3] };

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

  981.                               dstStride[3] };

  982. 

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

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

  985. 

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

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

  988.             c->sliceDir = 0;

  989. 

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

  991.                           dstStride2);

  992.     } else {

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

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

  995.                               -srcStride[3] };

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

  997.                               -dstStride[3] };

  998. 

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

  1000.         if (!usePal(c->srcFormat))

  1001.             src2[1] += ((srcSliceH >> c->chrSrcVSubSample) - 1) * srcStride[1];

  1002.         src2[2] += ((srcSliceH >> c->chrSrcVSubSample) - 1) * srcStride[2];

  1003.         src2[3] += (srcSliceH - 1) * srcStride[3];

  1004.         dst2[0] += ( c->dstH                         - 1) * dstStride[0];

  1005.         dst2[1] += ((c->dstH >> c->chrDstVSubSample) - 1) * dstStride[1];

  1006.         dst2[2] += ((c->dstH >> c->chrDstVSubSample) - 1) * dstStride[2];

  1007.         dst2[3] += ( c->dstH                         - 1) * dstStride[3];

  1008. 

  1009.         reset_ptr(src2, c->srcFormat);

  1010.         reset_ptr((void*)dst2, c->dstFormat);

  1011. 

  1012.         /* reset slice direction at end of frame */

  1013.         if (!srcSliceY)

  1014.             c->sliceDir = 0;

  1015. 

  1016.         return c->swScale(c, src2, srcStride2, c->srcH-srcSliceY-srcSliceH,

  1017.                           srcSliceH, dst2, dstStride2);

  1018.     }

  1019. }

  1020. 

  1021. /* Convert the palette to the same packed 32-bit format as the palette */

  1022. void sws_convertPalette8ToPacked32(const uint8_t *src, uint8_t *dst,

  1023.                                    int num_pixels, const uint8_t *palette)

  1024. {

  1025.     int i;

  1026. 

  1027.     for (i = 0; i < num_pixels; i++)

  1028.         ((uint32_t *) dst)[i] = ((const uint32_t *) palette)[src[i]];

  1029. }

  1030. 

  1031. /* Palette format: ABCD -> dst format: ABC */

  1032. void sws_convertPalette8ToPacked24(const uint8_t *src, uint8_t *dst,

  1033.                                    int num_pixels, const uint8_t *palette)

  1034. {

  1035.     int i;

  1036. 

  1037.     for (i = 0; i < num_pixels; i++) {

  1038.         //FIXME slow?

  1039.         dst[0] = palette[src[i] * 4 + 0];

  1040.         dst[1] = palette[src[i] * 4 + 1];

  1041.         dst[2] = palette[src[i] * 4 + 2];

  1042.         dst += 3;

  1043.     }

  1044. }