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FFmpeg/libswscale/swscale_unscaled.c

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  1. /*

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

  3.  *

  4.  * This file is part of Libav.

  5.  *

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

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

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

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

  10.  *

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

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

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

  14.  * Lesser General Public License for more details.

  15.  *

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

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

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

  19.  */

  20. 

  21. #include <inttypes.h>

  22. #include <string.h>

  23. #include <math.h>

  24. #include <stdio.h>

  25. #include "config.h"

  26. #include <assert.h>

  27. #include "swscale.h"

  28. #include "swscale_internal.h"

  29. #include "rgb2rgb.h"

  30. #include "libavutil/intreadwrite.h"

  31. #include "libavutil/cpu.h"

  32. #include "libavutil/avutil.h"

  33. #include "libavutil/mathematics.h"

  34. #include "libavutil/bswap.h"

  35. #include "libavutil/pixdesc.h"

  36. 

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

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

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

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

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

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

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

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

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

  46. };

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

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

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

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

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

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

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

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

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

  56. };

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

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

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

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

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

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

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

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

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

  66. };

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

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

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

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

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

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

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

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

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

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

  77. };

  78. 

  79. #define RGB2YUV_SHIFT 15

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

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

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

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

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

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

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

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

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

  89. 

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

  91.                       uint8_t val)

  92. {

  93.     int i;

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

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

  96.         memset(ptr, val, width);

  97.         ptr += stride;

  98.     }

  99. }

  100. 

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

  102.                             int height, int y, uint8_t val,

  103.                             const int dst_depth, const int big_endian)

  104. {

  105.     int i, j;

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

  107. #define FILL8TO9_OR_10(wfunc) \

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

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

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

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

  112.         } \

  113.         dst += stride / 2; \

  114.     }

  115.     if (big_endian) {

  116.         FILL8TO9_OR_10(AV_WB16);

  117.     } else {

  118.         FILL8TO9_OR_10(AV_WL16);

  119.     }

  120. }

  121. 

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

  123.                       int srcSliceY, int srcSliceH, int width,

  124.                       uint8_t *dst, int dstStride)

  125. {

  126.     dst += dstStride * srcSliceY;

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

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

  129.     } else {

  130.         int i;

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

  132.             memcpy(dst, src, width);

  133.             src += srcStride;

  134.             dst += dstStride;

  135.         }

  136.     }

  137. }

  138. 

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

  140.                                int srcStride[], int srcSliceY,

  141.                                int srcSliceH, uint8_t *dstParam[],

  142.                                int dstStride[])

  143. {

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

  145. 

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

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

  148. 

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

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

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

  152.     else

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

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

  155. 

  156.     return srcSliceH;

  157. }

  158. 

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

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

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

  162. {

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

  164. 

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

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

  167. 

  168.     return srcSliceH;

  169. }

  170. 

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

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

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

  174. {

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

  176. 

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

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

  179. 

  180.     return srcSliceH;

  181. }

  182. 

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

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

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

  186. {

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

  188. 

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

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

  191. 

  192.     return srcSliceH;

  193. }

  194. 

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

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

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

  198. {

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

  200. 

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

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

  203. 

  204.     return srcSliceH;

  205. }

  206. 

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

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

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

  210. {

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

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

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

  214. 

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

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

  217. 

  218.     if (dstParam[3])

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

  220. 

  221.     return srcSliceH;

  222. }

  223. 

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

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

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

  227. {

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

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

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

  231. 

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

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

  234. 

  235.     return srcSliceH;

  236. }

  237. 

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

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

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

  241. {

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

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

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

  245. 

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

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

  248. 

  249.     if (dstParam[3])

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

  251. 

  252.     return srcSliceH;

  253. }

  254. 

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

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

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

  258. {

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

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

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

  262. 

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

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

  265. 

  266.     return srcSliceH;

  267. }

  268. 

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

  270.                              const uint8_t *palette)

  271. {

  272.     int i;

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

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

  275. }

  276. 

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

  278.                                const uint8_t *palette)

  279. {

  280.     int i;

  281. 

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

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

  284. }

  285. 

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

  287.                              const uint8_t *palette)

  288. {

  289.     int i;

  290. 

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

  292.         //FIXME slow?

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

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

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

  296.         dst += 3;

  297.     }

  298. }

  299. 

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

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

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

  303. {

  304.     int i, j;

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

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

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

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

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

  310. 

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

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

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

  314.         }

  315.         srcPtr += srcstr;

  316.         dstPtr += dststr;

  317.     }

  318. 

  319.     return srcSliceH;

  320. }

  321. 

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

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

  324.                            int dstStride[])

  325. {

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

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

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

  329.                  const uint8_t *palette) = NULL;

  330.     int i;

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

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

  333. 

  334.     if (srcFormat == AV_PIX_FMT_Y400A) {

  335.         switch (dstFormat) {

  336.         case AV_PIX_FMT_RGB32  : conv = gray8aToPacked32; break;

  337.         case AV_PIX_FMT_BGR32  : conv = gray8aToPacked32; break;

  338.         case AV_PIX_FMT_BGR32_1: conv = gray8aToPacked32_1; break;

  339.         case AV_PIX_FMT_RGB32_1: conv = gray8aToPacked32_1; break;

  340.         case AV_PIX_FMT_RGB24  : conv = gray8aToPacked24; break;

  341.         case AV_PIX_FMT_BGR24  : conv = gray8aToPacked24; break;

  342.         }

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

  344.         switch (dstFormat) {

  345.         case AV_PIX_FMT_RGB32  : conv = sws_convertPalette8ToPacked32; break;

  346.         case AV_PIX_FMT_BGR32  : conv = sws_convertPalette8ToPacked32; break;

  347.         case AV_PIX_FMT_BGR32_1: conv = sws_convertPalette8ToPacked32; break;

  348.         case AV_PIX_FMT_RGB32_1: conv = sws_convertPalette8ToPacked32; break;

  349.         case AV_PIX_FMT_RGB24  : conv = sws_convertPalette8ToPacked24; break;

  350.         case AV_PIX_FMT_BGR24  : conv = sws_convertPalette8ToPacked24; break;

  351.         }

  352.     }

  353. 

  354.     if (!conv)

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

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

  357.     else {

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

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

  360.             srcPtr += srcStride[0];

  361.             dstPtr += dstStride[0];

  362.         }

  363.     }

  364. 

  365.     return srcSliceH;

  366. }

  367. 

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

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

  370.                              int width)

  371. {

  372.     int x, h, i;

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

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

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

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

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

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

  379.         }

  380. 

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

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

  383.     }

  384. }

  385. 

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

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

  388.                              int alpha_first, int width)

  389. {

  390.     int x, h, i;

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

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

  393. 

  394.         if (alpha_first) {

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

  396.                 *dest++ = 0xff;

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

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

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

  400.             }

  401.         } else {

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

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

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

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

  406.                 *dest++ = 0xff;

  407.             }

  408.         }

  409. 

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

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

  412.     }

  413. }

  414. 

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

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

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

  418. {

  419.     int alpha_first = 0;

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

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

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

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

  424. 

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

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

  427.                av_get_pix_fmt_name(c->srcFormat),

  428.                av_get_pix_fmt_name(c->dstFormat));

  429.         return srcSliceH;

  430.     }

  431. 

  432.     switch (c->dstFormat) {

  433.     case AV_PIX_FMT_BGR24:

  434.         gbr24ptopacked24(src102, stride102,

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

  436.                          srcSliceH, c->srcW);

  437.         break;

  438. 

  439.     case AV_PIX_FMT_RGB24:

  440.         gbr24ptopacked24(src201, stride201,

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

  442.                          srcSliceH, c->srcW);

  443.         break;

  444. 

  445.     case AV_PIX_FMT_ARGB:

  446.         alpha_first = 1;

  447.     case AV_PIX_FMT_RGBA:

  448.         gbr24ptopacked32(src201, stride201,

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

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

  451.         break;

  452. 

  453.     case AV_PIX_FMT_ABGR:

  454.         alpha_first = 1;

  455.     case AV_PIX_FMT_BGRA:

  456.         gbr24ptopacked32(src102, stride102,

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

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

  459.         break;

  460. 

  461.     default:

  462.         av_log(c, AV_LOG_ERROR,

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

  464.                av_get_pix_fmt_name(c->srcFormat),

  465.                av_get_pix_fmt_name(c->dstFormat));

  466.     }

  467. 

  468.     return srcSliceH;

  469. }

  470. 

  471. #define isRGBA32(x) (            \

  472.            (x) == AV_PIX_FMT_ARGB   \

  473.         || (x) == AV_PIX_FMT_RGBA   \

  474.         || (x) == AV_PIX_FMT_BGRA   \

  475.         || (x) == AV_PIX_FMT_ABGR   \

  476.         )

  477. 

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

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

  480. static rgbConvFn findRgbConvFn(SwsContext *c)

  481. {

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

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

  484.     const int srcId = c->srcFormatBpp;

  485.     const int dstId = c->dstFormatBpp;

  486.     rgbConvFn conv = NULL;

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

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

  489. 

  490. #define IS_NOT_NE(bpp, desc) \

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

  492.      (!(desc->flags & PIX_FMT_BE) != !HAVE_BIGENDIAN))

  493. 

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

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

  496.         return NULL;

  497. 

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

  499. 

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

  501.         if (     CONV_IS(ABGR, RGBA)

  502.               || CONV_IS(ARGB, BGRA)

  503.               || CONV_IS(BGRA, ARGB)

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

  505.         else if (CONV_IS(ABGR, ARGB)

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

  507.         else if (CONV_IS(ABGR, BGRA)

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

  509.         else if (CONV_IS(BGRA, RGBA)

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

  511.         else if (CONV_IS(BGRA, ABGR)

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

  513.     } else

  514.     /* BGR -> BGR */

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

  531.         }

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

  551.         }

  552.     }

  553. 

  554.     return conv;

  555. }

  556. 

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

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

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

  560.                            int dstStride[])

  561. 

  562. {

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

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

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

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

  567.     rgbConvFn conv = findRgbConvFn(c);

  568. 

  569.     if (!conv) {

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

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

  572.     } else {

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

  574.               uint8_t *dstPtr = dst[0];

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

  576.             !isRGBA32(dstFormat))

  577.             srcPtr += ALT32_CORR;

  578. 

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

  580.             !isRGBA32(srcFormat))

  581.             dstPtr += ALT32_CORR;

  582. 

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

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

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

  586.                  srcSliceH * srcStride[0]);

  587.         else {

  588.             int i;

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

  590. 

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

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

  593.                 srcPtr += srcStride[0];

  594.                 dstPtr += dstStride[0];

  595.             }

  596.         }

  597.     }

  598.     return srcSliceH;

  599. }

  600. 

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

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

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

  604. {

  605.     rgb24toyv12(

  606.         src[0],

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

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

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

  610.         c->srcW, srcSliceH,

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

  612.     if (dst[3])

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

  614.     return srcSliceH;

  615. }

  616. 

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

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

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

  620. {

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

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

  623. 

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

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

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

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

  628.     if (dst[3])

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

  630.     return srcSliceH;

  631. }

  632. 

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

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

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

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

  637. {

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

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

  640.     else {

  641.         int i;

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

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

  644.         int length = 0;

  645. 

  646.         /* universal length finder */

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

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

  649.             length += c->srcW;

  650.         assert(length != 0);

  651. 

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

  653.             memcpy(dstPtr, srcPtr, length);

  654.             srcPtr += srcStride[0];

  655.             dstPtr += dstStride[0];

  656.         }

  657.     }

  658.     return srcSliceH;

  659. }

  660. 

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

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

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

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

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

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

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

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

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

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

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

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

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

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

  675.         } \

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

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

  678.         dst += dstStride; \

  679.         src += srcStride; \

  680.     }

  681. 

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

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

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

  685. {

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

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

  688.     int plane, i, j;

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

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

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

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

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

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

  695. 

  696.         if (!dst[plane])

  697.             continue;

  698.         // ignore palette for GRAY8

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

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

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

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

  703.                 length *= 2;

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

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

  706.                                 length, height, y, val,

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

  708.                                 isBE(c->dstFormat));

  709.             } else

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

  711.                           val);

  712.         } else {

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

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

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

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

  717. 

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

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

  720. #define COPY9_OR_10TO16(rfunc, wfunc) \

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

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

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

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

  725.                         } \

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

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

  728.                     }

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

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

  731.                             COPY9_OR_10TO16(AV_RB16, AV_WB16);

  732.                         } else {

  733.                             COPY9_OR_10TO16(AV_RL16, AV_WB16);

  734.                         }

  735.                     } else {

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

  737.                             COPY9_OR_10TO16(AV_RB16, AV_WL16);

  738.                         } else {

  739.                             COPY9_OR_10TO16(AV_RL16, AV_WL16);

  740.                         }

  741.                     }

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

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

  744. #define COPY9_OR_10TO9_OR_10(loop) \

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

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

  747.                             loop; \

  748.                         } \

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

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

  751.                     }

  752. #define COPY9_OR_10TO9_OR_10_2(rfunc, wfunc) \

  753.                     if (dst_depth > src_depth) { \

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

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

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

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

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

  759.                                     dither_8x8_1, 1, clip9); \

  760.                     } else { \

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

  762.                     }

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

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

  765.                             COPY9_OR_10TO9_OR_10_2(AV_RB16, AV_WB16);

  766.                         } else {

  767.                             COPY9_OR_10TO9_OR_10_2(AV_RL16, AV_WB16);

  768.                         }

  769.                     } else {

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

  771.                             COPY9_OR_10TO9_OR_10_2(AV_RB16, AV_WL16);

  772.                         } else {

  773.                             COPY9_OR_10TO9_OR_10_2(AV_RL16, AV_WL16);

  774.                         }

  775.                     }

  776.                 } else {

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

  778. #define COPY9_OR_10TO8(rfunc) \

  779.                     if (src_depth == 9) { \

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

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

  782.                                     dither_8x8_1, 1, av_clip_uint8); \

  783.                     } else { \

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

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

  786.                                     dither_8x8_3, 2, av_clip_uint8); \

  787.                     }

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

  789.                         COPY9_OR_10TO8(AV_RB16);

  790.                     } else {

  791.                         COPY9_OR_10TO8(AV_RL16);

  792.                     }

  793.                 }

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

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

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

  797. 

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

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

  800. #define COPY16TO9_OR_10(rfunc, wfunc) \

  801.                     if (dst_depth == 9) { \

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

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

  804.                                     dither_8x8_128, 7, clip9); \

  805.                     } else { \

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

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

  808.                                     dither_8x8_64, 6, clip10); \

  809.                     }

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

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

  812.                             COPY16TO9_OR_10(AV_RB16, AV_WB16);

  813.                         } else {

  814.                             COPY16TO9_OR_10(AV_RL16, AV_WB16);

  815.                         }

  816.                     } else {

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

  818.                             COPY16TO9_OR_10(AV_RB16, AV_WL16);

  819.                         } else {

  820.                             COPY16TO9_OR_10(AV_RL16, AV_WL16);

  821.                         }

  822.                     }

  823.                 } else /* 8bit */ {

  824. #define COPY8TO9_OR_10(wfunc) \

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

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

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

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

  829.                         } \

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

  831.                         srcPtr  += srcStride[plane]; \

  832.                     }

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

  834.                         COPY8TO9_OR_10(AV_WB16);

  835.                     } else {

  836.                         COPY8TO9_OR_10(AV_WL16);

  837.                     }

  838.                 }

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

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

  841. #define COPY16TO8(rfunc) \

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

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

  844.                                 dither_8x8_256, 8, av_clip_uint8);

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

  846.                     COPY16TO8(AV_RB16);

  847.                 } else {

  848.                     COPY16TO8(AV_RL16);

  849.                 }

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

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

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

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

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

  855.                     }

  856.                     srcPtr += srcStride[plane];

  857.                     dstPtr += dstStride[plane];

  858.                 }

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

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

  861. 

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

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

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

  865.                     srcPtr += srcStride[plane];

  866.                     dstPtr += dstStride[plane];

  867.                 }

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

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

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

  871.                        height * dstStride[plane]);

  872.             } else {

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

  874.                     length *= 2;

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

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

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

  878.                     memcpy(dstPtr, srcPtr, length);

  879.                     srcPtr += srcStride[plane];

  880.                     dstPtr += dstStride[plane];

  881.                 }

  882.             }

  883.         }

  884.     }

  885.     return srcSliceH;

  886. }

  887. 

  888. 

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

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

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

  892. 

  893. 

  894. void ff_get_unscaled_swscale(SwsContext *c)

  895. {

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

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

  898.     const int flags = c->flags;

  899.     const int dstH = c->dstH;

  900.     int needsDither;

  901. 

  902.     needsDither = isAnyRGB(dstFormat) &&

  903.             c->dstFormatBpp < 24 &&

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

  905. 

  906.     /* yv12_to_nv12 */

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

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

  909.         c->swScale = planarToNv12Wrapper;

  910.     }

  911.     /* yuv2bgr */

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

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

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

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

  916.     }

  917. 

  918.     if (srcFormat == AV_PIX_FMT_YUV410P &&

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

  920.         !(flags & SWS_BITEXACT)) {

  921.         c->swScale = yvu9ToYv12Wrapper;

  922.     }

  923. 

  924.     /* bgr24toYV12 */

  925.     if (srcFormat == AV_PIX_FMT_BGR24 &&

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

  927.         !(flags & SWS_ACCURATE_RND))

  928.         c->swScale = bgr24ToYv12Wrapper;

  929. 

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

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

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

  933.         c->swScale= rgbToRgbWrapper;

  934. 

  935.     if (isPlanarRGB(srcFormat) && isPackedRGB(dstFormat))

  936.         c->swScale = planarRgbToRgbWrapper;

  937. 

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

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

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

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

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

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

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

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

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

  947.         IS_DIFFERENT_ENDIANESS(srcFormat, dstFormat, AV_PIX_FMT_RGB565))

  948.         c->swScale = packed_16bpc_bswap;

  949. 

  950.     if ((usePal(srcFormat) && (

  951.         dstFormat == AV_PIX_FMT_RGB32   ||

  952.         dstFormat == AV_PIX_FMT_RGB32_1 ||

  953.         dstFormat == AV_PIX_FMT_RGB24   ||

  954.         dstFormat == AV_PIX_FMT_BGR32   ||

  955.         dstFormat == AV_PIX_FMT_BGR32_1 ||

  956.         dstFormat == AV_PIX_FMT_BGR24)))

  957.         c->swScale = palToRgbWrapper;

  958. 

  959.     if (srcFormat == AV_PIX_FMT_YUV422P) {

  960.         if (dstFormat == AV_PIX_FMT_YUYV422)

  961.             c->swScale = yuv422pToYuy2Wrapper;

  962.         else if (dstFormat == AV_PIX_FMT_UYVY422)

  963.             c->swScale = yuv422pToUyvyWrapper;

  964.     }

  965. 

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

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

  968.         /* yv12_to_yuy2 */

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

  970.             if (dstFormat == AV_PIX_FMT_YUYV422)

  971.                 c->swScale = planarToYuy2Wrapper;

  972.             else if (dstFormat == AV_PIX_FMT_UYVY422)

  973.                 c->swScale = planarToUyvyWrapper;

  974.         }

  975.     }

  976.     if (srcFormat == AV_PIX_FMT_YUYV422 &&

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

  978.         c->swScale = yuyvToYuv420Wrapper;

  979.     if (srcFormat == AV_PIX_FMT_UYVY422 &&

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

  981.         c->swScale = uyvyToYuv420Wrapper;

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

  983.         c->swScale = yuyvToYuv422Wrapper;

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

  985.         c->swScale = uyvyToYuv422Wrapper;

  986. 

  987.     /* simple copy */

  988.     if ( srcFormat == dstFormat ||

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

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

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

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

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

  994.         (isPlanarYUV(srcFormat) && isPlanarYUV(dstFormat) &&

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

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

  997.          dstFormat != AV_PIX_FMT_NV12 && dstFormat != AV_PIX_FMT_NV21 &&

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

  999.     {

  1000.         if (isPacked(c->srcFormat))

  1001.             c->swScale = packedCopyWrapper;

  1002.         else /* Planar YUV or gray */

  1003.             c->swScale = planarCopyWrapper;

  1004.     }

  1005. 

  1006.     if (ARCH_BFIN)

  1007.         ff_bfin_get_unscaled_swscale(c);

  1008.     if (HAVE_ALTIVEC)

  1009.         ff_swscale_get_unscaled_altivec(c);

  1010. }

  1011. 

  1012. static void reset_ptr(const uint8_t *src[], int format)

  1013. {

  1014.     if (!isALPHA(format))

  1015.         src[3] = NULL;

  1016.     if (!isPlanar(format)) {

  1017.         src[3] = src[2] = NULL;

  1018. 

  1019.         if (!usePal(format))

  1020.             src[1] = NULL;

  1021.     }

  1022. }

  1023. 

  1024. static int check_image_pointers(uint8_t *data[4], enum AVPixelFormat pix_fmt,

  1025.                                 const int linesizes[4])

  1026. {

  1027.     const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(pix_fmt);

  1028.     int i;

  1029. 

  1030.     for (i = 0; i < 4; i++) {

  1031.         int plane = desc->comp[i].plane;

  1032.         if (!data[plane] || !linesizes[plane])

  1033.             return 0;

  1034.     }

  1035. 

  1036.     return 1;

  1037. }

  1038. 

  1039. /**

  1040.  * swscale wrapper, so we don't need to export the SwsContext.

  1041.  * Assumes planar YUV to be in YUV order instead of YVU.

  1042.  */

  1043. int attribute_align_arg sws_scale(struct SwsContext *c,

  1044.                                   const uint8_t * const srcSlice[],

  1045.                                   const int srcStride[], int srcSliceY,

  1046.                                   int srcSliceH, uint8_t *const dst[],

  1047.                                   const int dstStride[])

  1048. {

  1049.     int i;

  1050.     const uint8_t *src2[4] = { srcSlice[0], srcSlice[1], srcSlice[2], srcSlice[3] };

  1051.     uint8_t *dst2[4] = { dst[0], dst[1], dst[2], dst[3] };

  1052. 

  1053.     // do not mess up sliceDir if we have a "trailing" 0-size slice

  1054.     if (srcSliceH == 0)

  1055.         return 0;

  1056. 

  1057.     if (!check_image_pointers(srcSlice, c->srcFormat, srcStride)) {

  1058.         av_log(c, AV_LOG_ERROR, "bad src image pointers\n");

  1059.         return 0;

  1060.     }

  1061.     if (!check_image_pointers(dst, c->dstFormat, dstStride)) {

  1062.         av_log(c, AV_LOG_ERROR, "bad dst image pointers\n");

  1063.         return 0;

  1064.     }

  1065. 

  1066.     if (c->sliceDir == 0 && srcSliceY != 0 && srcSliceY + srcSliceH != c->srcH) {

  1067.         av_log(c, AV_LOG_ERROR, "Slices start in the middle!\n");

  1068.         return 0;

  1069.     }

  1070.     if (c->sliceDir == 0) {

  1071.         if (srcSliceY == 0) c->sliceDir = 1; else c->sliceDir = -1;

  1072.     }

  1073. 

  1074.     if (usePal(c->srcFormat)) {

  1075.         for (i = 0; i < 256; i++) {

  1076.             int p, r, g, b, y, u, v;

  1077.             if (c->srcFormat == AV_PIX_FMT_PAL8) {

  1078.                 p = ((const uint32_t *)(srcSlice[1]))[i];

  1079.                 r = (p >> 16) & 0xFF;

  1080.                 g = (p >>  8) & 0xFF;

  1081.                 b =  p        & 0xFF;

  1082.             } else if (c->srcFormat == AV_PIX_FMT_RGB8) {

  1083.                 r = ( i >> 5     ) * 36;

  1084.                 g = ((i >> 2) & 7) * 36;

  1085.                 b = ( i       & 3) * 85;

  1086.             } else if (c->srcFormat == AV_PIX_FMT_BGR8) {

  1087.                 b = ( i >> 6     ) * 85;

  1088.                 g = ((i >> 3) & 7) * 36;

  1089.                 r = ( i       & 7) * 36;

  1090.             } else if (c->srcFormat == AV_PIX_FMT_RGB4_BYTE) {

  1091.                 r = ( i >> 3     ) * 255;

  1092.                 g = ((i >> 1) & 3) * 85;

  1093.                 b = ( i       & 1) * 255;

  1094.             } else if (c->srcFormat == AV_PIX_FMT_GRAY8 ||

  1095.                       c->srcFormat == AV_PIX_FMT_Y400A) {

  1096.                 r = g = b = i;

  1097.             } else {

  1098.                 assert(c->srcFormat == AV_PIX_FMT_BGR4_BYTE);

  1099.                 b = ( i >> 3     ) * 255;

  1100.                 g = ((i >> 1) & 3) * 85;

  1101.                 r = ( i       & 1) * 255;

  1102.             }

  1103.             y = av_clip_uint8((RY * r + GY * g + BY * b + ( 33 << (RGB2YUV_SHIFT - 1))) >> RGB2YUV_SHIFT);

  1104.             u = av_clip_uint8((RU * r + GU * g + BU * b + (257 << (RGB2YUV_SHIFT - 1))) >> RGB2YUV_SHIFT);

  1105.             v = av_clip_uint8((RV * r + GV * g + BV * b + (257 << (RGB2YUV_SHIFT - 1))) >> RGB2YUV_SHIFT);

  1106.             c->pal_yuv[i] = y + (u << 8) + (v << 16);

  1107. 

  1108.             switch (c->dstFormat) {

  1109.             case AV_PIX_FMT_BGR32:

  1110. #if !HAVE_BIGENDIAN

  1111.             case AV_PIX_FMT_RGB24:

  1112. #endif

  1113.                 c->pal_rgb[i] =  r + (g << 8) + (b << 16);

  1114.                 break;

  1115.             case AV_PIX_FMT_BGR32_1:

  1116. #if HAVE_BIGENDIAN

  1117.             case AV_PIX_FMT_BGR24:

  1118. #endif

  1119.                 c->pal_rgb[i] = (r + (g << 8) + (b << 16)) << 8;

  1120.                 break;

  1121.             case AV_PIX_FMT_RGB32_1:

  1122. #if HAVE_BIGENDIAN

  1123.             case AV_PIX_FMT_RGB24:

  1124. #endif

  1125.                 c->pal_rgb[i] = (b + (g << 8) + (r << 16)) << 8;

  1126.                 break;

  1127.             case AV_PIX_FMT_RGB32:

  1128. #if !HAVE_BIGENDIAN

  1129.             case AV_PIX_FMT_BGR24:

  1130. #endif

  1131.             default:

  1132.                 c->pal_rgb[i] =  b + (g << 8) + (r << 16);

  1133.             }

  1134.         }

  1135.     }

  1136. 

  1137.     // copy strides, so they can safely be modified

  1138.     if (c->sliceDir == 1) {

  1139.         // slices go from top to bottom

  1140.         int srcStride2[4] = { srcStride[0], srcStride[1], srcStride[2],

  1141.                               srcStride[3] };

  1142.         int dstStride2[4] = { dstStride[0], dstStride[1], dstStride[2],

  1143.                               dstStride[3] };

  1144. 

  1145.         reset_ptr(src2, c->srcFormat);

  1146.         reset_ptr((const uint8_t **) dst2, c->dstFormat);

  1147. 

  1148.         /* reset slice direction at end of frame */

  1149.         if (srcSliceY + srcSliceH == c->srcH)

  1150.             c->sliceDir = 0;

  1151. 

  1152.         return c->swScale(c, src2, srcStride2, srcSliceY, srcSliceH, dst2,

  1153.                           dstStride2);

  1154.     } else {

  1155.         // slices go from bottom to top => we flip the image internally

  1156.         int srcStride2[4] = { -srcStride[0], -srcStride[1], -srcStride[2],

  1157.                               -srcStride[3] };

  1158.         int dstStride2[4] = { -dstStride[0], -dstStride[1], -dstStride[2],

  1159.                               -dstStride[3] };

  1160. 

  1161.         src2[0] += (srcSliceH - 1) * srcStride[0];

  1162.         if (!usePal(c->srcFormat))

  1163.             src2[1] += ((srcSliceH >> c->chrSrcVSubSample) - 1) * srcStride[1];

  1164.         src2[2] += ((srcSliceH >> c->chrSrcVSubSample) - 1) * srcStride[2];

  1165.         src2[3] += (srcSliceH - 1) * srcStride[3];

  1166.         dst2[0] += ( c->dstH                         - 1) * dstStride[0];

  1167.         dst2[1] += ((c->dstH >> c->chrDstVSubSample) - 1) * dstStride[1];

  1168.         dst2[2] += ((c->dstH >> c->chrDstVSubSample) - 1) * dstStride[2];

  1169.         dst2[3] += ( c->dstH                         - 1) * dstStride[3];

  1170. 

  1171.         reset_ptr(src2, c->srcFormat);

  1172.         reset_ptr((const uint8_t **) dst2, c->dstFormat);

  1173. 

  1174.         /* reset slice direction at end of frame */

  1175.         if (!srcSliceY)

  1176.             c->sliceDir = 0;

  1177. 

  1178.         return c->swScale(c, src2, srcStride2, c->srcH-srcSliceY-srcSliceH,

  1179.                           srcSliceH, dst2, dstStride2);

  1180.     }

  1181. }

  1182. 

  1183. /* Convert the palette to the same packed 32-bit format as the palette */

  1184. void sws_convertPalette8ToPacked32(const uint8_t *src, uint8_t *dst,

  1185.                                    int num_pixels, const uint8_t *palette)

  1186. {

  1187.     int i;

  1188. 

  1189.     for (i = 0; i < num_pixels; i++)

  1190.         ((uint32_t *) dst)[i] = ((const uint32_t *) palette)[src[i]];

  1191. }

  1192. 

  1193. /* Palette format: ABCD -> dst format: ABC */

  1194. void sws_convertPalette8ToPacked24(const uint8_t *src, uint8_t *dst,

  1195.                                    int num_pixels, const uint8_t *palette)

  1196. {

  1197.     int i;

  1198. 

  1199.     for (i = 0; i < num_pixels; i++) {

  1200.         //FIXME slow?

  1201.         dst[0] = palette[src[i] * 4 + 0];

  1202.         dst[1] = palette[src[i] * 4 + 1];

  1203.         dst[2] = palette[src[i] * 4 + 2];

  1204.         dst += 3;

  1205.     }

  1206. }