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FFmpeg/libswscale/swscale_unscaled.c

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  1. /*

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

  3.  *

  4.  * This file is part of Libav.

  5.  *

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

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

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

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

  10.  *

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

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

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

  14.  * Lesser General Public License for more details.

  15.  *

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

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

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

  19.  */

  20. 

  21. #include <inttypes.h>

  22. #include <string.h>

  23. #include <math.h>

  24. #include <stdio.h>

  25. #include "config.h"

  26. #include <assert.h>

  27. #include "swscale.h"

  28. #include "swscale_internal.h"

  29. #include "rgb2rgb.h"

  30. #include "libavutil/intreadwrite.h"

  31. #include "libavutil/cpu.h"

  32. #include "libavutil/avutil.h"

  33. #include "libavutil/mathematics.h"

  34. #include "libavutil/bswap.h"

  35. #include "libavutil/pixdesc.h"

  36. 

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

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

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

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

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

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

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

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

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

  46. };

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

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

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

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

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

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

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

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

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

  56. };

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

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

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

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

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

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

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

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

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

  66. };

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

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

  69.     { 200,   8, 248,  56, 196,   4, 244,  52,},

  70.     { 104, 168,  88, 152, 100, 164,  84, 148,},

  71.     { 232,  40, 216,  24, 228,  36, 212,  20,},

  72.     {  64, 128, 102, 176,  76, 140, 124, 188,},

  73.     { 192,   0, 240,  48, 204,  12, 252,  60,},

  74.     {  96, 160,  80, 144, 108, 172,  92, 156,},

  75.     { 224,  32, 208,  16, 236,  44, 220,  28,},

  76. };

  77. 

  78. #define RGB2YUV_SHIFT 15

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

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

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

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

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

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

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

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

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

  88. 

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

  90.                       uint8_t val)

  91. {

  92.     int i;

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

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

  95.         memset(ptr, val, width);

  96.         ptr += stride;

  97.     }

  98. }

  99. 

  100. static void fill_plane9or10(uint8_t *plane, int stride, int width,

  101.                             int height, int y, uint8_t val,

  102.                             const int dst_depth, const int big_endian)

  103. {

  104.     int i, j;

  105.     uint16_t *dst = (uint16_t *) (plane + stride * y);

  106. #define FILL8TO9_OR_10(wfunc) \

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

  108.         for (j = 0; j < width; j++) { \

  109.             wfunc(&dst[j], (val << (dst_depth - 8)) |  \

  110.                                (val >> (16 - dst_depth))); \

  111.         } \

  112.         dst += stride / 2; \

  113.     }

  114.     if (big_endian) {

  115.         FILL8TO9_OR_10(AV_WB16);

  116.     } else {

  117.         FILL8TO9_OR_10(AV_WL16);

  118.     }

  119. }

  120. 

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

  122.                       int srcSliceY, int srcSliceH, int width,

  123.                       uint8_t *dst, int dstStride)

  124. {

  125.     dst += dstStride * srcSliceY;

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

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

  128.     } else {

  129.         int i;

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

  131.             memcpy(dst, src, width);

  132.             src += srcStride;

  133.             dst += dstStride;

  134.         }

  135.     }

  136. }

  137. 

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

  139.                                int srcStride[], int srcSliceY,

  140.                                int srcSliceH, uint8_t *dstParam[],

  141.                                int dstStride[])

  142. {

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

  144. 

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

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

  147. 

  148.     if (c->dstFormat == AV_PIX_FMT_NV12)

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

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

  151.     else

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

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

  154. 

  155.     return srcSliceH;

  156. }

  157. 

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

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

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

  161. {

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

  163. 

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

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

  166. 

  167.     return srcSliceH;

  168. }

  169. 

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

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

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

  173. {

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

  175. 

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

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

  178. 

  179.     return srcSliceH;

  180. }

  181. 

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

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

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

  185. {

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

  187. 

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

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

  190. 

  191.     return srcSliceH;

  192. }

  193. 

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

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

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

  197. {

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

  199. 

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

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

  202. 

  203.     return srcSliceH;

  204. }

  205. 

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

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

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

  209. {

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

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

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

  213. 

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

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

  216. 

  217.     if (dstParam[3])

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

  219. 

  220.     return srcSliceH;

  221. }

  222. 

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

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

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

  226. {

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

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

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

  230. 

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

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

  233. 

  234.     return srcSliceH;

  235. }

  236. 

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

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

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

  240. {

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

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

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

  244. 

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

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

  247. 

  248.     if (dstParam[3])

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

  250. 

  251.     return srcSliceH;

  252. }

  253. 

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

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

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

  257. {

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

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

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

  261. 

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

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

  264. 

  265.     return srcSliceH;

  266. }

  267. 

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

  269.                              const uint8_t *palette)

  270. {

  271.     int i;

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

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

  274. }

  275. 

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

  277.                                const uint8_t *palette)

  278. {

  279.     int i;

  280. 

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

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

  283. }

  284. 

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

  286.                              const uint8_t *palette)

  287. {

  288.     int i;

  289. 

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

  291.         //FIXME slow?

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

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

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

  295.         dst += 3;

  296.     }

  297. }

  298. 

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

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

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

  302. {

  303.     int i, j;

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

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

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

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

  308.     int min_stride         = FFMIN(srcstr, dststr);

  309. 

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

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

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

  313.         }

  314.         srcPtr += srcstr;

  315.         dstPtr += dststr;

  316.     }

  317. 

  318.     return srcSliceH;

  319. }

  320. 

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

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

  323.                            int dstStride[])

  324. {

  325.     const enum AVPixelFormat srcFormat = c->srcFormat;

  326.     const enum AVPixelFormat dstFormat = c->dstFormat;

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

  328.                  const uint8_t *palette) = NULL;

  329.     int i;

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

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

  332. 

  333.     if (srcFormat == AV_PIX_FMT_Y400A) {

  334.         switch (dstFormat) {

  335.         case AV_PIX_FMT_RGB32  : conv = gray8aToPacked32; break;

  336.         case AV_PIX_FMT_BGR32  : conv = gray8aToPacked32; break;

  337.         case AV_PIX_FMT_BGR32_1: conv = gray8aToPacked32_1; break;

  338.         case AV_PIX_FMT_RGB32_1: conv = gray8aToPacked32_1; break;

  339.         case AV_PIX_FMT_RGB24  : conv = gray8aToPacked24; break;

  340.         case AV_PIX_FMT_BGR24  : conv = gray8aToPacked24; break;

  341.         }

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

  343.         switch (dstFormat) {

  344.         case AV_PIX_FMT_RGB32  : conv = sws_convertPalette8ToPacked32; break;

  345.         case AV_PIX_FMT_BGR32  : conv = sws_convertPalette8ToPacked32; break;

  346.         case AV_PIX_FMT_BGR32_1: conv = sws_convertPalette8ToPacked32; break;

  347.         case AV_PIX_FMT_RGB32_1: conv = sws_convertPalette8ToPacked32; break;

  348.         case AV_PIX_FMT_RGB24  : conv = sws_convertPalette8ToPacked24; break;

  349.         case AV_PIX_FMT_BGR24  : conv = sws_convertPalette8ToPacked24; break;

  350.         }

  351.     }

  352. 

  353.     if (!conv)

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

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

  356.     else {

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

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

  359.             srcPtr += srcStride[0];

  360.             dstPtr += dstStride[0];

  361.         }

  362.     }

  363. 

  364.     return srcSliceH;

  365. }

  366. 

  367. static void gbr24ptopacked24(const uint8_t *src[], int srcStride[],

  368.                              uint8_t *dst, int dstStride, int srcSliceH,

  369.                              int width)

  370. {

  371.     int x, h, i;

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

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

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

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

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

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

  378.         }

  379. 

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

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

  382.     }

  383. }

  384. 

  385. static void gbr24ptopacked32(const uint8_t *src[], int srcStride[],

  386.                              uint8_t *dst, int dstStride, int srcSliceH,

  387.                              int alpha_first, int width)

  388. {

  389.     int x, h, i;

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

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

  392. 

  393.         if (alpha_first) {

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

  395.                 *dest++ = 0xff;

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

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

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

  399.             }

  400.         } else {

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

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

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

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

  405.                 *dest++ = 0xff;

  406.             }

  407.         }

  408. 

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

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

  411.     }

  412. }

  413. 

  414. static int planarRgbToRgbWrapper(SwsContext *c, const uint8_t *src[],

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

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

  417. {

  418.     int alpha_first = 0;

  419.     const uint8_t *src102[] = { src[1], src[0], src[2] };

  420.     const uint8_t *src201[] = { src[2], src[0], src[1] };

  421.     int stride102[] = { srcStride[1], srcStride[0], srcStride[2] };

  422.     int stride201[] = { srcStride[2], srcStride[0], srcStride[1] };

  423. 

  424.     if (c->srcFormat != AV_PIX_FMT_GBRP) {

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

  426.                av_get_pix_fmt_name(c->srcFormat),

  427.                av_get_pix_fmt_name(c->dstFormat));

  428.         return srcSliceH;

  429.     }

  430. 

  431.     switch (c->dstFormat) {

  432.     case AV_PIX_FMT_BGR24:

  433.         gbr24ptopacked24(src102, stride102,

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

  435.                          srcSliceH, c->srcW);

  436.         break;

  437. 

  438.     case AV_PIX_FMT_RGB24:

  439.         gbr24ptopacked24(src201, stride201,

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

  441.                          srcSliceH, c->srcW);

  442.         break;

  443. 

  444.     case AV_PIX_FMT_ARGB:

  445.         alpha_first = 1;

  446.     case AV_PIX_FMT_RGBA:

  447.         gbr24ptopacked32(src201, stride201,

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

  449.                          srcSliceH, alpha_first, c->srcW);

  450.         break;

  451. 

  452.     case AV_PIX_FMT_ABGR:

  453.         alpha_first = 1;

  454.     case AV_PIX_FMT_BGRA:

  455.         gbr24ptopacked32(src102, stride102,

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

  457.                          srcSliceH, alpha_first, c->srcW);

  458.         break;

  459. 

  460.     default:

  461.         av_log(c, AV_LOG_ERROR,

  462.                "unsupported planar RGB conversion %s -> %s\n",

  463.                av_get_pix_fmt_name(c->srcFormat),

  464.                av_get_pix_fmt_name(c->dstFormat));

  465.     }

  466. 

  467.     return srcSliceH;

  468. }

  469. 

  470. static void packedtogbr24p(const uint8_t *src, int srcStride,

  471.                            uint8_t *dst[], int dstStride[], int srcSliceH,

  472.                            int alpha_first, int inc_size, int width)

  473. {

  474.     uint8_t *dest[3];

  475.     int x, h;

  476. 

  477.     dest[0] = dst[0];

  478.     dest[1] = dst[1];

  479.     dest[2] = dst[2];

  480. 

  481.     if (alpha_first)

  482.         src++;

  483. 

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

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

  486.             dest[0][x] = src[0];

  487.             dest[1][x] = src[1];

  488.             dest[2][x] = src[2];

  489. 

  490.             src += inc_size;

  491.         }

  492.         src     += srcStride - width * inc_size;

  493.         dest[0] += dstStride[0];

  494.         dest[1] += dstStride[1];

  495.         dest[2] += dstStride[2];

  496.     }

  497. }

  498. 

  499. static int rgbToPlanarRgbWrapper(SwsContext *c, const uint8_t *src[],

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

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

  502. {

  503.     int alpha_first = 0;

  504.     int stride102[] = { dstStride[1], dstStride[0], dstStride[2] };

  505.     int stride201[] = { dstStride[2], dstStride[0], dstStride[1] };

  506.     uint8_t *dst102[] = { dst[1] + srcSliceY * dstStride[1],

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

  508.                           dst[2] + srcSliceY * dstStride[2] };

  509.     uint8_t *dst201[] = { dst[2] + srcSliceY * dstStride[2],

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

  511.                           dst[1] + srcSliceY * dstStride[1] };

  512. 

  513.     switch (c->srcFormat) {

  514.     case AV_PIX_FMT_RGB24:

  515.         packedtogbr24p((const uint8_t *) src[0], srcStride[0], dst201,

  516.                        stride201, srcSliceH, alpha_first, 3, c->srcW);

  517.         break;

  518.     case AV_PIX_FMT_BGR24:

  519.         packedtogbr24p((const uint8_t *) src[0], srcStride[0], dst102,

  520.                        stride102, srcSliceH, alpha_first, 3, c->srcW);

  521.         break;

  522.     case AV_PIX_FMT_ARGB:

  523.         alpha_first = 1;

  524.     case AV_PIX_FMT_RGBA:

  525.         packedtogbr24p((const uint8_t *) src[0], srcStride[0], dst201,

  526.                        stride201, srcSliceH, alpha_first, 4, c->srcW);

  527.         break;

  528.     case AV_PIX_FMT_ABGR:

  529.         alpha_first = 1;

  530.     case AV_PIX_FMT_BGRA:

  531.         packedtogbr24p((const uint8_t *) src[0], srcStride[0], dst102,

  532.                        stride102, srcSliceH, alpha_first, 4, c->srcW);

  533.         break;

  534.     default:

  535.         av_log(c, AV_LOG_ERROR,

  536.                "unsupported planar RGB conversion %s -> %s\n",

  537.                av_get_pix_fmt_name(c->srcFormat),

  538.                av_get_pix_fmt_name(c->dstFormat));

  539.     }

  540. 

  541.     return srcSliceH;

  542. }

  543. 

  544. #define isRGBA32(x) (            \

  545.            (x) == AV_PIX_FMT_ARGB   \

  546.         || (x) == AV_PIX_FMT_RGBA   \

  547.         || (x) == AV_PIX_FMT_BGRA   \

  548.         || (x) == AV_PIX_FMT_ABGR   \

  549.         )

  550. 

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

  552. typedef void (* rgbConvFn) (const uint8_t *, uint8_t *, int);

  553. static rgbConvFn findRgbConvFn(SwsContext *c)

  554. {

  555.     const enum AVPixelFormat srcFormat = c->srcFormat;

  556.     const enum AVPixelFormat dstFormat = c->dstFormat;

  557.     const int srcId = c->srcFormatBpp;

  558.     const int dstId = c->dstFormatBpp;

  559.     rgbConvFn conv = NULL;

  560.     const AVPixFmtDescriptor *desc_src = av_pix_fmt_desc_get(srcFormat);

  561.     const AVPixFmtDescriptor *desc_dst = av_pix_fmt_desc_get(dstFormat);

  562. 

  563. #define IS_NOT_NE(bpp, desc) \

  564.     (((bpp + 7) >> 3) == 2 && \

  565.      (!(desc->flags & AV_PIX_FMT_FLAG_BE) != !HAVE_BIGENDIAN))

  566. 

  567.     /* if this is non-native rgb444/555/565, don't handle it here. */

  568.     if (IS_NOT_NE(srcId, desc_src) || IS_NOT_NE(dstId, desc_dst))

  569.         return NULL;

  570. 

  571. #define CONV_IS(src, dst) (srcFormat == AV_PIX_FMT_##src && dstFormat == AV_PIX_FMT_##dst)

  572. 

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

  574.         if (     CONV_IS(ABGR, RGBA)

  575.               || CONV_IS(ARGB, BGRA)

  576.               || CONV_IS(BGRA, ARGB)

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

  578.         else if (CONV_IS(ABGR, ARGB)

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

  580.         else if (CONV_IS(ABGR, BGRA)

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

  582.         else if (CONV_IS(BGRA, RGBA)

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

  584.         else if (CONV_IS(BGRA, ABGR)

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

  586.     } else

  587.     /* BGR -> BGR */

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

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

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

  591.         case 0x000F000C: conv = rgb12to15; break;

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

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

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

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

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

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

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

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

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

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

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

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

  604.         }

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

  624.         }

  625.     }

  626. 

  627.     return conv;

  628. }

  629. 

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

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

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

  633.                            int dstStride[])

  634. 

  635. {

  636.     const enum AVPixelFormat srcFormat = c->srcFormat;

  637.     const enum AVPixelFormat dstFormat = c->dstFormat;

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

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

  640.     rgbConvFn conv = findRgbConvFn(c);

  641. 

  642.     if (!conv) {

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

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

  645.     } else {

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

  647.               uint8_t *dstPtr = dst[0];

  648.         if ((srcFormat == AV_PIX_FMT_RGB32_1 || srcFormat == AV_PIX_FMT_BGR32_1) &&

  649.             !isRGBA32(dstFormat))

  650.             srcPtr += ALT32_CORR;

  651. 

  652.         if ((dstFormat == AV_PIX_FMT_RGB32_1 || dstFormat == AV_PIX_FMT_BGR32_1) &&

  653.             !isRGBA32(srcFormat))

  654.             dstPtr += ALT32_CORR;

  655. 

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

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

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

  659.                  srcSliceH * srcStride[0]);

  660.         else {

  661.             int i;

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

  663. 

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

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

  666.                 srcPtr += srcStride[0];

  667.                 dstPtr += dstStride[0];

  668.             }

  669.         }

  670.     }

  671.     return srcSliceH;

  672. }

  673. 

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

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

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

  677. {

  678.     rgb24toyv12(

  679.         src[0],

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

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

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

  683.         c->srcW, srcSliceH,

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

  685.     if (dst[3])

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

  687.     return srcSliceH;

  688. }

  689. 

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

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

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

  693. {

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

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

  696. 

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

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

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

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

  701.     if (dst[3])

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

  703.     return srcSliceH;

  704. }

  705. 

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

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

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

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

  710. {

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

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

  713.     else {

  714.         int i;

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

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

  717.         int length = 0;

  718. 

  719.         /* universal length finder */

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

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

  722.             length += c->srcW;

  723.         assert(length != 0);

  724. 

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

  726.             memcpy(dstPtr, srcPtr, length);

  727.             srcPtr += srcStride[0];

  728.             dstPtr += dstStride[0];

  729.         }

  730.     }

  731.     return srcSliceH;

  732. }

  733. 

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

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

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

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

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

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

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

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

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

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

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

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

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

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

  748.         } \

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

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

  751.         dst += dstStride; \

  752.         src += srcStride; \

  753.     }

  754. 

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

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

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

  758. {

  759.     const AVPixFmtDescriptor *desc_src = av_pix_fmt_desc_get(c->srcFormat);

  760.     const AVPixFmtDescriptor *desc_dst = av_pix_fmt_desc_get(c->dstFormat);

  761.     int plane, i, j;

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

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

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

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

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

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

  768. 

  769.         if (!dst[plane])

  770.             continue;

  771.         // ignore palette for GRAY8

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

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

  774.             int val = (plane == 3) ? 255 : 128;

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

  776.                 length *= 2;

  777.             if (is9_OR_10BPS(c->dstFormat)) {

  778.                 fill_plane9or10(dst[plane], dstStride[plane],

  779.                                 length, height, y, val,

  780.                                 desc_dst->comp[plane].depth_minus1 + 1,

  781.                                 isBE(c->dstFormat));

  782.             } else

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

  784.                           val);

  785.         } else {

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

  787.                 const int src_depth = desc_src->comp[plane].depth_minus1 + 1;

  788.                 const int dst_depth = desc_dst->comp[plane].depth_minus1 + 1;

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

  790. 

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

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

  793. #define COPY9_OR_10TO16(rfunc, wfunc) \

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

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

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

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

  798.                         } \

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

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

  801.                     }

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

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

  804.                             COPY9_OR_10TO16(AV_RB16, AV_WB16);

  805.                         } else {

  806.                             COPY9_OR_10TO16(AV_RL16, AV_WB16);

  807.                         }

  808.                     } else {

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

  810.                             COPY9_OR_10TO16(AV_RB16, AV_WL16);

  811.                         } else {

  812.                             COPY9_OR_10TO16(AV_RL16, AV_WL16);

  813.                         }

  814.                     }

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

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

  817. #define COPY9_OR_10TO9_OR_10(loop) \

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

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

  820.                             loop; \

  821.                         } \

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

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

  824.                     }

  825. #define COPY9_OR_10TO9_OR_10_2(rfunc, wfunc) \

  826.                     if (dst_depth > src_depth) { \

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

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

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

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

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

  832.                                     dither_8x8_1, 1, clip9); \

  833.                     } else { \

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

  835.                     }

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

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

  838.                             COPY9_OR_10TO9_OR_10_2(AV_RB16, AV_WB16);

  839.                         } else {

  840.                             COPY9_OR_10TO9_OR_10_2(AV_RL16, AV_WB16);

  841.                         }

  842.                     } else {

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

  844.                             COPY9_OR_10TO9_OR_10_2(AV_RB16, AV_WL16);

  845.                         } else {

  846.                             COPY9_OR_10TO9_OR_10_2(AV_RL16, AV_WL16);

  847.                         }

  848.                     }

  849.                 } else {

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

  851. #define COPY9_OR_10TO8(rfunc) \

  852.                     if (src_depth == 9) { \

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

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

  855.                                     dither_8x8_1, 1, av_clip_uint8); \

  856.                     } else { \

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

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

  859.                                     dither_8x8_3, 2, av_clip_uint8); \

  860.                     }

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

  862.                         COPY9_OR_10TO8(AV_RB16);

  863.                     } else {

  864.                         COPY9_OR_10TO8(AV_RL16);

  865.                     }

  866.                 }

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

  868.                 const int dst_depth = desc_dst->comp[plane].depth_minus1 + 1;

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

  870. 

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

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

  873. #define COPY16TO9_OR_10(rfunc, wfunc) \

  874.                     if (dst_depth == 9) { \

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

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

  877.                                     ff_dither_8x8_128, 7, clip9); \

  878.                     } else { \

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

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

  881.                                     dither_8x8_64, 6, clip10); \

  882.                     }

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

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

  885.                             COPY16TO9_OR_10(AV_RB16, AV_WB16);

  886.                         } else {

  887.                             COPY16TO9_OR_10(AV_RL16, AV_WB16);

  888.                         }

  889.                     } else {

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

  891.                             COPY16TO9_OR_10(AV_RB16, AV_WL16);

  892.                         } else {

  893.                             COPY16TO9_OR_10(AV_RL16, AV_WL16);

  894.                         }

  895.                     }

  896.                 } else /* 8bit */ {

  897. #define COPY8TO9_OR_10(wfunc) \

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

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

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

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

  902.                         } \

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

  904.                         srcPtr  += srcStride[plane]; \

  905.                     }

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

  907.                         COPY8TO9_OR_10(AV_WB16);

  908.                     } else {

  909.                         COPY8TO9_OR_10(AV_WL16);

  910.                     }

  911.                 }

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

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

  914. #define COPY16TO8(rfunc) \

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

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

  917.                                 dither_8x8_256, 8, av_clip_uint8);

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

  919.                     COPY16TO8(AV_RB16);

  920.                 } else {

  921.                     COPY16TO8(AV_RL16);

  922.                 }

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

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

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

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

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

  928.                     }

  929.                     srcPtr += srcStride[plane];

  930.                     dstPtr += dstStride[plane];

  931.                 }

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

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

  934. 

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

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

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

  938.                     srcPtr += srcStride[plane];

  939.                     dstPtr += dstStride[plane];

  940.                 }

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

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

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

  944.                        height * dstStride[plane]);

  945.             } else {

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

  947.                     length *= 2;

  948.                 else if (!desc_src->comp[0].depth_minus1)

  949.                     length >>= 3; // monowhite/black

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

  951.                     memcpy(dstPtr, srcPtr, length);

  952.                     srcPtr += srcStride[plane];

  953.                     dstPtr += dstStride[plane];

  954.                 }

  955.             }

  956.         }

  957.     }

  958.     return srcSliceH;

  959. }

  960. 

  961. 

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

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

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

  965. 

  966. 

  967. void ff_get_unscaled_swscale(SwsContext *c)

  968. {

  969.     const enum AVPixelFormat srcFormat = c->srcFormat;

  970.     const enum AVPixelFormat dstFormat = c->dstFormat;

  971.     const int flags = c->flags;

  972.     const int dstH = c->dstH;

  973.     int needsDither;

  974. 

  975.     needsDither = isAnyRGB(dstFormat) &&

  976.             c->dstFormatBpp < 24 &&

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

  978. 

  979.     /* yv12_to_nv12 */

  980.     if ((srcFormat == AV_PIX_FMT_YUV420P || srcFormat == AV_PIX_FMT_YUVA420P) &&

  981.         (dstFormat == AV_PIX_FMT_NV12 || dstFormat == AV_PIX_FMT_NV21)) {

  982.         c->swscale = planarToNv12Wrapper;

  983.     }

  984.     /* yuv2bgr */

  985.     if ((srcFormat == AV_PIX_FMT_YUV420P || srcFormat == AV_PIX_FMT_YUV422P ||

  986.          srcFormat == AV_PIX_FMT_YUVA420P) && isAnyRGB(dstFormat) &&

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

  988.         c->swscale = ff_yuv2rgb_get_func_ptr(c);

  989.     }

  990. 

  991.     if (srcFormat == AV_PIX_FMT_YUV410P &&

  992.         (dstFormat == AV_PIX_FMT_YUV420P || dstFormat == AV_PIX_FMT_YUVA420P) &&

  993.         !(flags & SWS_BITEXACT)) {

  994.         c->swscale = yvu9ToYv12Wrapper;

  995.     }

  996. 

  997.     /* bgr24toYV12 */

  998.     if (srcFormat == AV_PIX_FMT_BGR24 &&

  999.         (dstFormat == AV_PIX_FMT_YUV420P || dstFormat == AV_PIX_FMT_YUVA420P) &&

  1000.         !(flags & SWS_ACCURATE_RND))

  1001.         c->swscale = bgr24ToYv12Wrapper;

  1002. 

  1003.     /* RGB/BGR -> RGB/BGR (no dither needed forms) */

  1004.     if (isAnyRGB(srcFormat) && isAnyRGB(dstFormat) && findRgbConvFn(c)

  1005.         && (!needsDither || (c->flags&(SWS_FAST_BILINEAR|SWS_POINT))))

  1006.         c->swscale = rgbToRgbWrapper;

  1007. 

  1008. #define isByteRGB(f) (             \

  1009.         f == AV_PIX_FMT_RGB32   || \

  1010.         f == AV_PIX_FMT_RGB32_1 || \

  1011.         f == AV_PIX_FMT_RGB24   || \

  1012.         f == AV_PIX_FMT_BGR32   || \

  1013.         f == AV_PIX_FMT_BGR32_1 || \

  1014.         f == AV_PIX_FMT_BGR24)

  1015. 

  1016.     if (srcFormat == AV_PIX_FMT_GBRP && isPlanar(srcFormat) && isByteRGB(dstFormat))

  1017.         c->swscale = planarRgbToRgbWrapper;

  1018. 

  1019.     if (av_pix_fmt_desc_get(srcFormat)->comp[0].depth_minus1 == 7 &&

  1020.         isPackedRGB(srcFormat) && dstFormat == AV_PIX_FMT_GBRP)

  1021.         c->swscale = rgbToPlanarRgbWrapper;

  1022. 

  1023.     /* bswap 16 bits per pixel/component packed formats */

  1024.     if (IS_DIFFERENT_ENDIANESS(srcFormat, dstFormat, AV_PIX_FMT_BGR444) ||

  1025.         IS_DIFFERENT_ENDIANESS(srcFormat, dstFormat, AV_PIX_FMT_BGR48)  ||

  1026.         IS_DIFFERENT_ENDIANESS(srcFormat, dstFormat, AV_PIX_FMT_BGR555) ||

  1027.         IS_DIFFERENT_ENDIANESS(srcFormat, dstFormat, AV_PIX_FMT_BGR565) ||

  1028.         IS_DIFFERENT_ENDIANESS(srcFormat, dstFormat, AV_PIX_FMT_GRAY16) ||

  1029.         IS_DIFFERENT_ENDIANESS(srcFormat, dstFormat, AV_PIX_FMT_RGB444) ||

  1030.         IS_DIFFERENT_ENDIANESS(srcFormat, dstFormat, AV_PIX_FMT_RGB48)  ||

  1031.         IS_DIFFERENT_ENDIANESS(srcFormat, dstFormat, AV_PIX_FMT_RGB555) ||

  1032.         IS_DIFFERENT_ENDIANESS(srcFormat, dstFormat, AV_PIX_FMT_RGB565) ||

  1033.         IS_DIFFERENT_ENDIANESS(srcFormat, dstFormat, AV_PIX_FMT_XYZ12))

  1034.         c->swscale = packed_16bpc_bswap;

  1035. 

  1036.     if ((usePal(srcFormat) && (

  1037.         dstFormat == AV_PIX_FMT_RGB32   ||

  1038.         dstFormat == AV_PIX_FMT_RGB32_1 ||

  1039.         dstFormat == AV_PIX_FMT_RGB24   ||

  1040.         dstFormat == AV_PIX_FMT_BGR32   ||

  1041.         dstFormat == AV_PIX_FMT_BGR32_1 ||

  1042.         dstFormat == AV_PIX_FMT_BGR24)))

  1043.         c->swscale = palToRgbWrapper;

  1044. 

  1045.     if (srcFormat == AV_PIX_FMT_YUV422P) {

  1046.         if (dstFormat == AV_PIX_FMT_YUYV422)

  1047.             c->swscale = yuv422pToYuy2Wrapper;

  1048.         else if (dstFormat == AV_PIX_FMT_UYVY422)

  1049.             c->swscale = yuv422pToUyvyWrapper;

  1050.     }

  1051. 

  1052.     /* LQ converters if -sws 0 or -sws 4*/

  1053.     if (c->flags&(SWS_FAST_BILINEAR|SWS_POINT)) {

  1054.         /* yv12_to_yuy2 */

  1055.         if (srcFormat == AV_PIX_FMT_YUV420P || srcFormat == AV_PIX_FMT_YUVA420P) {

  1056.             if (dstFormat == AV_PIX_FMT_YUYV422)

  1057.                 c->swscale = planarToYuy2Wrapper;

  1058.             else if (dstFormat == AV_PIX_FMT_UYVY422)

  1059.                 c->swscale = planarToUyvyWrapper;

  1060.         }

  1061.     }

  1062.     if (srcFormat == AV_PIX_FMT_YUYV422 &&

  1063.        (dstFormat == AV_PIX_FMT_YUV420P || dstFormat == AV_PIX_FMT_YUVA420P))

  1064.         c->swscale = yuyvToYuv420Wrapper;

  1065.     if (srcFormat == AV_PIX_FMT_UYVY422 &&

  1066.        (dstFormat == AV_PIX_FMT_YUV420P || dstFormat == AV_PIX_FMT_YUVA420P))

  1067.         c->swscale = uyvyToYuv420Wrapper;

  1068.     if (srcFormat == AV_PIX_FMT_YUYV422 && dstFormat == AV_PIX_FMT_YUV422P)

  1069.         c->swscale = yuyvToYuv422Wrapper;

  1070.     if (srcFormat == AV_PIX_FMT_UYVY422 && dstFormat == AV_PIX_FMT_YUV422P)

  1071.         c->swscale = uyvyToYuv422Wrapper;

  1072. 

  1073.     /* simple copy */

  1074.     if ( srcFormat == dstFormat ||

  1075.         (srcFormat == AV_PIX_FMT_YUVA420P && dstFormat == AV_PIX_FMT_YUV420P) ||

  1076.         (srcFormat == AV_PIX_FMT_YUV420P && dstFormat == AV_PIX_FMT_YUVA420P) ||

  1077.         (isPlanarYUV(srcFormat) && isGray(dstFormat)) ||

  1078.         (isPlanarYUV(dstFormat) && isGray(srcFormat)) ||

  1079.         (isGray(dstFormat) && isGray(srcFormat)) ||

  1080.         (isPlanarYUV(srcFormat) && isPlanarYUV(dstFormat) &&

  1081.          c->chrDstHSubSample == c->chrSrcHSubSample &&

  1082.          c->chrDstVSubSample == c->chrSrcVSubSample &&

  1083.          dstFormat != AV_PIX_FMT_NV12 && dstFormat != AV_PIX_FMT_NV21 &&

  1084.          srcFormat != AV_PIX_FMT_NV12 && srcFormat != AV_PIX_FMT_NV21))

  1085.     {

  1086.         if (isPacked(c->srcFormat))

  1087.             c->swscale = packedCopyWrapper;

  1088.         else /* Planar YUV or gray */

  1089.             c->swscale = planarCopyWrapper;

  1090.     }

  1091. 

  1092.     if (ARCH_BFIN)

  1093.         ff_get_unscaled_swscale_bfin(c);

  1094.     if (ARCH_PPC)

  1095.         ff_get_unscaled_swscale_ppc(c);

  1096. }

  1097. 

  1098. static void reset_ptr(const uint8_t *src[], int format)

  1099. {

  1100.     if (!isALPHA(format))

  1101.         src[3] = NULL;

  1102.     if (!isPlanar(format)) {

  1103.         src[3] = src[2] = NULL;

  1104. 

  1105.         if (!usePal(format))

  1106.             src[1] = NULL;

  1107.     }

  1108. }

  1109. 

  1110. static int check_image_pointers(uint8_t *data[4], enum AVPixelFormat pix_fmt,

  1111.                                 const int linesizes[4])

  1112. {

  1113.     const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(pix_fmt);

  1114.     int i;

  1115. 

  1116.     for (i = 0; i < 4; i++) {

  1117.         int plane = desc->comp[i].plane;

  1118.         if (!data[plane] || !linesizes[plane])

  1119.             return 0;

  1120.     }

  1121. 

  1122.     return 1;

  1123. }

  1124. 

  1125. /**

  1126.  * swscale wrapper, so we don't need to export the SwsContext.

  1127.  * Assumes planar YUV to be in YUV order instead of YVU.

  1128.  */

  1129. int attribute_align_arg sws_scale(struct SwsContext *c,

  1130.                                   const uint8_t * const srcSlice[],

  1131.                                   const int srcStride[], int srcSliceY,

  1132.                                   int srcSliceH, uint8_t *const dst[],

  1133.                                   const int dstStride[])

  1134. {

  1135.     int i;

  1136.     const uint8_t *src2[4] = { srcSlice[0], srcSlice[1], srcSlice[2], srcSlice[3] };

  1137.     uint8_t *dst2[4] = { dst[0], dst[1], dst[2], dst[3] };

  1138. 

  1139.     // do not mess up sliceDir if we have a "trailing" 0-size slice

  1140.     if (srcSliceH == 0)

  1141.         return 0;

  1142. 

  1143.     if (!check_image_pointers(srcSlice, c->srcFormat, srcStride)) {

  1144.         av_log(c, AV_LOG_ERROR, "bad src image pointers\n");

  1145.         return 0;

  1146.     }

  1147.     if (!check_image_pointers(dst, c->dstFormat, dstStride)) {

  1148.         av_log(c, AV_LOG_ERROR, "bad dst image pointers\n");

  1149.         return 0;

  1150.     }

  1151. 

  1152.     if (c->sliceDir == 0 && srcSliceY != 0 && srcSliceY + srcSliceH != c->srcH) {

  1153.         av_log(c, AV_LOG_ERROR, "Slices start in the middle!\n");

  1154.         return 0;

  1155.     }

  1156.     if (c->sliceDir == 0) {

  1157.         if (srcSliceY == 0) c->sliceDir = 1; else c->sliceDir = -1;

  1158.     }

  1159. 

  1160.     if (usePal(c->srcFormat)) {

  1161.         for (i = 0; i < 256; i++) {

  1162.             int p, r, g, b, y, u, v;

  1163.             if (c->srcFormat == AV_PIX_FMT_PAL8) {

  1164.                 p = ((const uint32_t *)(srcSlice[1]))[i];

  1165.                 r = (p >> 16) & 0xFF;

  1166.                 g = (p >>  8) & 0xFF;

  1167.                 b =  p        & 0xFF;

  1168.             } else if (c->srcFormat == AV_PIX_FMT_RGB8) {

  1169.                 r = ( i >> 5     ) * 36;

  1170.                 g = ((i >> 2) & 7) * 36;

  1171.                 b = ( i       & 3) * 85;

  1172.             } else if (c->srcFormat == AV_PIX_FMT_BGR8) {

  1173.                 b = ( i >> 6     ) * 85;

  1174.                 g = ((i >> 3) & 7) * 36;

  1175.                 r = ( i       & 7) * 36;

  1176.             } else if (c->srcFormat == AV_PIX_FMT_RGB4_BYTE) {

  1177.                 r = ( i >> 3     ) * 255;

  1178.                 g = ((i >> 1) & 3) * 85;

  1179.                 b = ( i       & 1) * 255;

  1180.             } else if (c->srcFormat == AV_PIX_FMT_GRAY8 ||

  1181.                       c->srcFormat == AV_PIX_FMT_Y400A) {

  1182.                 r = g = b = i;

  1183.             } else {

  1184.                 assert(c->srcFormat == AV_PIX_FMT_BGR4_BYTE);

  1185.                 b = ( i >> 3     ) * 255;

  1186.                 g = ((i >> 1) & 3) * 85;

  1187.                 r = ( i       & 1) * 255;

  1188.             }

  1189.             y = av_clip_uint8((RY * r + GY * g + BY * b + ( 33 << (RGB2YUV_SHIFT - 1))) >> RGB2YUV_SHIFT);

  1190.             u = av_clip_uint8((RU * r + GU * g + BU * b + (257 << (RGB2YUV_SHIFT - 1))) >> RGB2YUV_SHIFT);

  1191.             v = av_clip_uint8((RV * r + GV * g + BV * b + (257 << (RGB2YUV_SHIFT - 1))) >> RGB2YUV_SHIFT);

  1192.             c->pal_yuv[i] = y + (u << 8) + (v << 16);

  1193. 

  1194.             switch (c->dstFormat) {

  1195.             case AV_PIX_FMT_BGR32:

  1196. #if !HAVE_BIGENDIAN

  1197.             case AV_PIX_FMT_RGB24:

  1198. #endif

  1199.                 c->pal_rgb[i] =  r + (g << 8) + (b << 16);

  1200.                 break;

  1201.             case AV_PIX_FMT_BGR32_1:

  1202. #if HAVE_BIGENDIAN

  1203.             case AV_PIX_FMT_BGR24:

  1204. #endif

  1205.                 c->pal_rgb[i] = (r + (g << 8) + (b << 16)) << 8;

  1206.                 break;

  1207.             case AV_PIX_FMT_RGB32_1:

  1208. #if HAVE_BIGENDIAN

  1209.             case AV_PIX_FMT_RGB24:

  1210. #endif

  1211.                 c->pal_rgb[i] = (b + (g << 8) + (r << 16)) << 8;

  1212.                 break;

  1213.             case AV_PIX_FMT_RGB32:

  1214. #if !HAVE_BIGENDIAN

  1215.             case AV_PIX_FMT_BGR24:

  1216. #endif

  1217.             default:

  1218.                 c->pal_rgb[i] =  b + (g << 8) + (r << 16);

  1219.             }

  1220.         }

  1221.     }

  1222. 

  1223.     // copy strides, so they can safely be modified

  1224.     if (c->sliceDir == 1) {

  1225.         // slices go from top to bottom

  1226.         int srcStride2[4] = { srcStride[0], srcStride[1], srcStride[2],

  1227.                               srcStride[3] };

  1228.         int dstStride2[4] = { dstStride[0], dstStride[1], dstStride[2],

  1229.                               dstStride[3] };

  1230. 

  1231.         reset_ptr(src2, c->srcFormat);

  1232.         reset_ptr((const uint8_t **) dst2, c->dstFormat);

  1233. 

  1234.         /* reset slice direction at end of frame */

  1235.         if (srcSliceY + srcSliceH == c->srcH)

  1236.             c->sliceDir = 0;

  1237. 

  1238.         return c->swscale(c, src2, srcStride2, srcSliceY, srcSliceH, dst2,

  1239.                           dstStride2);

  1240.     } else {

  1241.         // slices go from bottom to top => we flip the image internally

  1242.         int srcStride2[4] = { -srcStride[0], -srcStride[1], -srcStride[2],

  1243.                               -srcStride[3] };

  1244.         int dstStride2[4] = { -dstStride[0], -dstStride[1], -dstStride[2],

  1245.                               -dstStride[3] };

  1246. 

  1247.         src2[0] += (srcSliceH - 1) * srcStride[0];

  1248.         if (!usePal(c->srcFormat))

  1249.             src2[1] += ((srcSliceH >> c->chrSrcVSubSample) - 1) * srcStride[1];

  1250.         src2[2] += ((srcSliceH >> c->chrSrcVSubSample) - 1) * srcStride[2];

  1251.         src2[3] += (srcSliceH - 1) * srcStride[3];

  1252.         dst2[0] += ( c->dstH                         - 1) * dstStride[0];

  1253.         dst2[1] += ((c->dstH >> c->chrDstVSubSample) - 1) * dstStride[1];

  1254.         dst2[2] += ((c->dstH >> c->chrDstVSubSample) - 1) * dstStride[2];

  1255.         dst2[3] += ( c->dstH                         - 1) * dstStride[3];

  1256. 

  1257.         reset_ptr(src2, c->srcFormat);

  1258.         reset_ptr((const uint8_t **) dst2, c->dstFormat);

  1259. 

  1260.         /* reset slice direction at end of frame */

  1261.         if (!srcSliceY)

  1262.             c->sliceDir = 0;

  1263. 

  1264.         return c->swscale(c, src2, srcStride2, c->srcH-srcSliceY-srcSliceH,

  1265.                           srcSliceH, dst2, dstStride2);

  1266.     }

  1267. }

  1268. 

  1269. /* Convert the palette to the same packed 32-bit format as the palette */

  1270. void sws_convertPalette8ToPacked32(const uint8_t *src, uint8_t *dst,

  1271.                                    int num_pixels, const uint8_t *palette)

  1272. {

  1273.     int i;

  1274. 

  1275.     for (i = 0; i < num_pixels; i++)

  1276.         ((uint32_t *) dst)[i] = ((const uint32_t *) palette)[src[i]];

  1277. }

  1278. 

  1279. /* Palette format: ABCD -> dst format: ABC */

  1280. void sws_convertPalette8ToPacked24(const uint8_t *src, uint8_t *dst,

  1281.                                    int num_pixels, const uint8_t *palette)

  1282. {

  1283.     int i;

  1284. 

  1285.     for (i = 0; i < num_pixels; i++) {

  1286.         //FIXME slow?

  1287.         dst[0] = palette[src[i] * 4 + 0];

  1288.         dst[1] = palette[src[i] * 4 + 1];

  1289.         dst[2] = palette[src[i] * 4 + 2];

  1290.         dst += 3;

  1291.     }

  1292. }