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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 copyPlane(const uint8_t *src, int srcStride,

  102.                       int srcSliceY, int srcSliceH, int width,

  103.                       uint8_t *dst, int dstStride)

  104. {

  105.     dst += dstStride * srcSliceY;

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

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

  108.     } else {

  109.         int i;

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

  111.             memcpy(dst, src, width);

  112.             src += srcStride;

  113.             dst += dstStride;

  114.         }

  115.     }

  116. }

  117. 

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

  119.                                int srcStride[], int srcSliceY,

  120.                                int srcSliceH, uint8_t *dstParam[],

  121.                                int dstStride[])

  122. {

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

  124. 

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

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

  127. 

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

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

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

  131.     else

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

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

  134. 

  135.     return srcSliceH;

  136. }

  137. 

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

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

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

  141. {

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

  143. 

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

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

  146. 

  147.     return srcSliceH;

  148. }

  149. 

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

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

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

  153. {

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

  155. 

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

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

  158. 

  159.     return srcSliceH;

  160. }

  161. 

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

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

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

  165. {

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

  167. 

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

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

  170. 

  171.     return srcSliceH;

  172. }

  173. 

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

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

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

  177. {

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

  179. 

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

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

  182. 

  183.     return srcSliceH;

  184. }

  185. 

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

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

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

  189. {

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

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

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

  193. 

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

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

  196. 

  197.     if (dstParam[3])

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

  199. 

  200.     return srcSliceH;

  201. }

  202. 

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

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

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

  206. {

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

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

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

  210. 

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

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

  213. 

  214.     return srcSliceH;

  215. }

  216. 

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

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

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

  220. {

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

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

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

  224. 

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

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

  227. 

  228.     if (dstParam[3])

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

  230. 

  231.     return srcSliceH;

  232. }

  233. 

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

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

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

  237. {

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

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

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

  241. 

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

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

  244. 

  245.     return srcSliceH;

  246. }

  247. 

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

  249.                              const uint8_t *palette)

  250. {

  251.     int i;

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

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

  254. }

  255. 

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

  257.                                const uint8_t *palette)

  258. {

  259.     int i;

  260. 

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

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

  263. }

  264. 

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

  266.                              const uint8_t *palette)

  267. {

  268.     int i;

  269. 

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

  271.         //FIXME slow?

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

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

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

  275.         dst += 3;

  276.     }

  277. }

  278. 

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

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

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

  282. {

  283.     int i, j;

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

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

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

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

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

  289. 

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

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

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

  293.         }

  294.         srcPtr += srcstr;

  295.         dstPtr += dststr;

  296.     }

  297. 

  298.     return srcSliceH;

  299. }

  300. 

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

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

  303.                            int dstStride[])

  304. {

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

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

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

  308.                  const uint8_t *palette) = NULL;

  309.     int i;

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

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

  312. 

  313.     if (srcFormat == PIX_FMT_Y400A) {

  314.         switch (dstFormat) {

  315.         case PIX_FMT_RGB32  : conv = gray8aToPacked32; break;

  316.         case PIX_FMT_BGR32  : conv = gray8aToPacked32; break;

  317.         case PIX_FMT_BGR32_1: conv = gray8aToPacked32_1; break;

  318.         case PIX_FMT_RGB32_1: conv = gray8aToPacked32_1; break;

  319.         case PIX_FMT_RGB24  : conv = gray8aToPacked24; break;

  320.         case PIX_FMT_BGR24  : conv = gray8aToPacked24; break;

  321.         }

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

  323.         switch (dstFormat) {

  324.         case PIX_FMT_RGB32  : conv = sws_convertPalette8ToPacked32; break;

  325.         case PIX_FMT_BGR32  : conv = sws_convertPalette8ToPacked32; break;

  326.         case PIX_FMT_BGR32_1: conv = sws_convertPalette8ToPacked32; break;

  327.         case PIX_FMT_RGB32_1: conv = sws_convertPalette8ToPacked32; break;

  328.         case PIX_FMT_RGB24  : conv = sws_convertPalette8ToPacked24; break;

  329.         case PIX_FMT_BGR24  : conv = sws_convertPalette8ToPacked24; break;

  330.         }

  331.     }

  332. 

  333.     if (!conv)

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

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

  336.     else {

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

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

  339.             srcPtr += srcStride[0];

  340.             dstPtr += dstStride[0];

  341.         }

  342.     }

  343. 

  344.     return srcSliceH;

  345. }

  346. 

  347. #define isRGBA32(x) (            \

  348.            (x) == PIX_FMT_ARGB   \

  349.         || (x) == PIX_FMT_RGBA   \

  350.         || (x) == PIX_FMT_BGRA   \

  351.         || (x) == PIX_FMT_ABGR   \

  352.         )

  353. 

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

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

  356. static rgbConvFn findRgbConvFn(SwsContext *c)

  357. {

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

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

  360.     const int srcId = c->srcFormatBpp;

  361.     const int dstId = c->dstFormatBpp;

  362.     rgbConvFn conv = NULL;

  363. 

  364. #define IS_NOT_NE(bpp, fmt) \

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

  366.      (!(av_pix_fmt_descriptors[fmt].flags & PIX_FMT_BE) != !HAVE_BIGENDIAN))

  367. 

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

  369.     if (IS_NOT_NE(srcId, srcFormat) || IS_NOT_NE(dstId, dstFormat))

  370.         return NULL;

  371. 

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

  373. 

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

  375.         if (     CONV_IS(ABGR, RGBA)

  376.               || CONV_IS(ARGB, BGRA)

  377.               || CONV_IS(BGRA, ARGB)

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

  379.         else if (CONV_IS(ABGR, ARGB)

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

  381.         else if (CONV_IS(ABGR, BGRA)

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

  383.         else if (CONV_IS(BGRA, RGBA)

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

  385.         else if (CONV_IS(BGRA, ABGR)

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

  387.     } else

  388.     /* BGR -> BGR */

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

  405.         }

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

  425.         }

  426.     }

  427. 

  428.     return conv;

  429. }

  430. 

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

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

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

  434.                            int dstStride[])

  435. 

  436. {

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

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

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

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

  441.     rgbConvFn conv = findRgbConvFn(c);

  442. 

  443.     if (!conv) {

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

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

  446.     } else {

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

  448.               uint8_t *dstPtr = dst[0];

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

  450.             !isRGBA32(dstFormat))

  451.             srcPtr += ALT32_CORR;

  452. 

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

  454.             !isRGBA32(srcFormat))

  455.             dstPtr += ALT32_CORR;

  456. 

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

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

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

  460.                  srcSliceH * srcStride[0]);

  461.         else {

  462.             int i;

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

  464. 

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

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

  467.                 srcPtr += srcStride[0];

  468.                 dstPtr += dstStride[0];

  469.             }

  470.         }

  471.     }

  472.     return srcSliceH;

  473. }

  474. 

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

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

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

  478. {

  479.     rgb24toyv12(

  480.         src[0],

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

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

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

  484.         c->srcW, srcSliceH,

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

  486.     if (dst[3])

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

  488.     return srcSliceH;

  489. }

  490. 

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

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

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

  494. {

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

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

  497. 

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

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

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

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

  502.     if (dst[3])

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

  504.     return srcSliceH;

  505. }

  506. 

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

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

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

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

  511. {

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

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

  514.     else {

  515.         int i;

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

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

  518.         int length = 0;

  519. 

  520.         /* universal length finder */

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

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

  523.             length += c->srcW;

  524.         assert(length != 0);

  525. 

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

  527.             memcpy(dstPtr, srcPtr, length);

  528.             srcPtr += srcStride[0];

  529.             dstPtr += dstStride[0];

  530.         }

  531.     }

  532.     return srcSliceH;

  533. }

  534. 

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

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

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

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

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

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

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

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

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

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

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

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

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

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

  549.         } \

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

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

  552.         dst += dstStride; \

  553.         src += srcStride; \

  554.     }

  555. 

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

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

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

  559. {

  560.     int plane, i, j;

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

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

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

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

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

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

  567. 

  568.         if (!dst[plane])

  569.             continue;

  570.         // ignore palette for GRAY8

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

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

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

  574.                 length *= 2;

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

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

  577.         } else {

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

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

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

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

  582. 

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

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

  585. #define COPY9_OR_10TO16(rfunc, wfunc) \

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

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

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

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

  590.                         } \

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

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

  593.                     }

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

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

  596.                             COPY9_OR_10TO16(AV_RB16, AV_WB16);

  597.                         } else {

  598.                             COPY9_OR_10TO16(AV_RL16, AV_WB16);

  599.                         }

  600.                     } else {

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

  602.                             COPY9_OR_10TO16(AV_RB16, AV_WL16);

  603.                         } else {

  604.                             COPY9_OR_10TO16(AV_RL16, AV_WL16);

  605.                         }

  606.                     }

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

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

  609. #define COPY9_OR_10TO9_OR_10(loop) \

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

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

  612.                             loop; \

  613.                         } \

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

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

  616.                     }

  617. #define COPY9_OR_10TO9_OR_10_2(rfunc, wfunc) \

  618.                     if (dst_depth > src_depth) { \

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

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

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

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

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

  624.                                     dither_8x8_1, 1, clip9); \

  625.                     } else { \

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

  627.                     }

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

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

  630.                             COPY9_OR_10TO9_OR_10_2(AV_RB16, AV_WB16);

  631.                         } else {

  632.                             COPY9_OR_10TO9_OR_10_2(AV_RL16, AV_WB16);

  633.                         }

  634.                     } else {

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

  636.                             COPY9_OR_10TO9_OR_10_2(AV_RB16, AV_WL16);

  637.                         } else {

  638.                             COPY9_OR_10TO9_OR_10_2(AV_RL16, AV_WL16);

  639.                         }

  640.                     }

  641.                 } else {

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

  643. #define COPY9_OR_10TO8(rfunc) \

  644.                     if (src_depth == 9) { \

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

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

  647.                                     dither_8x8_1, 1, av_clip_uint8); \

  648.                     } else { \

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

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

  651.                                     dither_8x8_3, 2, av_clip_uint8); \

  652.                     }

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

  654.                         COPY9_OR_10TO8(AV_RB16);

  655.                     } else {

  656.                         COPY9_OR_10TO8(AV_RL16);

  657.                     }

  658.                 }

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

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

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

  662. 

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

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

  665. #define COPY16TO9_OR_10(rfunc, wfunc) \

  666.                     if (dst_depth == 9) { \

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

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

  669.                                     dither_8x8_128, 7, clip9); \

  670.                     } else { \

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

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

  673.                                     dither_8x8_64, 6, clip10); \

  674.                     }

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

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

  677.                             COPY16TO9_OR_10(AV_RB16, AV_WB16);

  678.                         } else {

  679.                             COPY16TO9_OR_10(AV_RL16, AV_WB16);

  680.                         }

  681.                     } else {

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

  683.                             COPY16TO9_OR_10(AV_RB16, AV_WL16);

  684.                         } else {

  685.                             COPY16TO9_OR_10(AV_RL16, AV_WL16);

  686.                         }

  687.                     }

  688.                 } else /* 8bit */ {

  689. #define COPY8TO9_OR_10(wfunc) \

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

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

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

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

  694.                         } \

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

  696.                         srcPtr  += srcStride[plane]; \

  697.                     }

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

  699.                         COPY8TO9_OR_10(AV_WB16);

  700.                     } else {

  701.                         COPY8TO9_OR_10(AV_WL16);

  702.                     }

  703.                 }

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

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

  706. #define COPY16TO8(rfunc) \

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

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

  709.                                 dither_8x8_256, 8, av_clip_uint8);

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

  711.                     COPY16TO8(AV_RB16);

  712.                 } else {

  713.                     COPY16TO8(AV_RL16);

  714.                 }

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

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

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

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

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

  720.                     }

  721.                     srcPtr += srcStride[plane];

  722.                     dstPtr += dstStride[plane];

  723.                 }

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

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

  726. 

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

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

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

  730.                     srcPtr += srcStride[plane];

  731.                     dstPtr += dstStride[plane];

  732.                 }

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

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

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

  736.                        height * dstStride[plane]);

  737.             } else {

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

  739.                     length *= 2;

  740.                 else if (!av_pix_fmt_descriptors[c->srcFormat].comp[0].depth_minus1)

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

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

  743.                     memcpy(dstPtr, srcPtr, length);

  744.                     srcPtr += srcStride[plane];

  745.                     dstPtr += dstStride[plane];

  746.                 }

  747.             }

  748.         }

  749.     }

  750.     return srcSliceH;

  751. }

  752. 

  753. 

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

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

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

  757. 

  758. 

  759. void ff_get_unscaled_swscale(SwsContext *c)

  760. {

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

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

  763.     const int flags = c->flags;

  764.     const int dstH = c->dstH;

  765.     int needsDither;

  766. 

  767.     needsDither = isAnyRGB(dstFormat) &&

  768.             c->dstFormatBpp < 24 &&

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

  770. 

  771.     /* yv12_to_nv12 */

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

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

  774.         c->swScale = planarToNv12Wrapper;

  775.     }

  776.     /* yuv2bgr */

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

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

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

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

  781.     }

  782. 

  783.     if (srcFormat == PIX_FMT_YUV410P &&

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

  785.         !(flags & SWS_BITEXACT)) {

  786.         c->swScale = yvu9ToYv12Wrapper;

  787.     }

  788. 

  789.     /* bgr24toYV12 */

  790.     if (srcFormat == PIX_FMT_BGR24 &&

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

  792.         !(flags & SWS_ACCURATE_RND))

  793.         c->swScale = bgr24ToYv12Wrapper;

  794. 

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

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

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

  798.         c->swScale= rgbToRgbWrapper;

  799. 

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

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

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

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

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

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

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

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

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

  809.         IS_DIFFERENT_ENDIANESS(srcFormat, dstFormat, PIX_FMT_RGB565))

  810.         c->swScale = packed_16bpc_bswap;

  811. 

  812.     if ((usePal(srcFormat) && (

  813.         dstFormat == PIX_FMT_RGB32   ||

  814.         dstFormat == PIX_FMT_RGB32_1 ||

  815.         dstFormat == PIX_FMT_RGB24   ||

  816.         dstFormat == PIX_FMT_BGR32   ||

  817.         dstFormat == PIX_FMT_BGR32_1 ||

  818.         dstFormat == PIX_FMT_BGR24)))

  819.         c->swScale = palToRgbWrapper;

  820. 

  821.     if (srcFormat == PIX_FMT_YUV422P) {

  822.         if (dstFormat == PIX_FMT_YUYV422)

  823.             c->swScale = yuv422pToYuy2Wrapper;

  824.         else if (dstFormat == PIX_FMT_UYVY422)

  825.             c->swScale = yuv422pToUyvyWrapper;

  826.     }

  827. 

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

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

  830.         /* yv12_to_yuy2 */

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

  832.             if (dstFormat == PIX_FMT_YUYV422)

  833.                 c->swScale = planarToYuy2Wrapper;

  834.             else if (dstFormat == PIX_FMT_UYVY422)

  835.                 c->swScale = planarToUyvyWrapper;

  836.         }

  837.     }

  838.     if (srcFormat == PIX_FMT_YUYV422 &&

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

  840.         c->swScale = yuyvToYuv420Wrapper;

  841.     if (srcFormat == PIX_FMT_UYVY422 &&

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

  843.         c->swScale = uyvyToYuv420Wrapper;

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

  845.         c->swScale = yuyvToYuv422Wrapper;

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

  847.         c->swScale = uyvyToYuv422Wrapper;

  848. 

  849.     /* simple copy */

  850.     if ( srcFormat == dstFormat ||

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

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

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

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

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

  856.         (isPlanarYUV(srcFormat) && isPlanarYUV(dstFormat) &&

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

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

  859.          dstFormat != PIX_FMT_NV12 && dstFormat != PIX_FMT_NV21 &&

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

  861.     {

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

  863.             c->swScale = packedCopyWrapper;

  864.         else /* Planar YUV or gray */

  865.             c->swScale = planarCopyWrapper;

  866.     }

  867. 

  868.     if (ARCH_BFIN)

  869.         ff_bfin_get_unscaled_swscale(c);

  870.     if (HAVE_ALTIVEC)

  871.         ff_swscale_get_unscaled_altivec(c);

  872. }

  873. 

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

  875. {

  876.     if (!isALPHA(format))

  877.         src[3] = NULL;

  878.     if (!isPlanar(format)) {

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

  880. 

  881.         if (!usePal(format))

  882.             src[1] = NULL;

  883.     }

  884. }

  885. 

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

  887.                                 const int linesizes[4])

  888. {

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

  890.     int i;

  891. 

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

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

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

  895.             return 0;

  896.     }

  897. 

  898.     return 1;

  899. }

  900. 

  901. /**

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

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

  904.  */

  905. int attribute_align_arg sws_scale(struct SwsContext *c,

  906.                                   const uint8_t * const srcSlice[],

  907.                                   const int srcStride[], int srcSliceY,

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

  909.                                   const int dstStride[])

  910. {

  911.     int i;

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

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

  914. 

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

  916.     if (srcSliceH == 0)

  917.         return 0;

  918. 

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

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

  921.         return 0;

  922.     }

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

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

  925.         return 0;

  926.     }

  927. 

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

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

  930.         return 0;

  931.     }

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

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

  934.     }

  935. 

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

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

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

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

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

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

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

  943.                 b =  p        & 0xFF;

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

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

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

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

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

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

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

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

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

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

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

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

  956.             } else if (c->srcFormat == PIX_FMT_GRAY8 ||

  957.                       c->srcFormat == PIX_FMT_Y400A) {

  958.                 r = g = b = i;

  959.             } else {

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

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

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

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

  964.             }

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

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

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

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

  969. 

  970.             switch (c->dstFormat) {

  971.             case PIX_FMT_BGR32:

  972. #if !HAVE_BIGENDIAN

  973.             case PIX_FMT_RGB24:

  974. #endif

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

  976.                 break;

  977.             case PIX_FMT_BGR32_1:

  978. #if HAVE_BIGENDIAN

  979.             case PIX_FMT_BGR24:

  980. #endif

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

  982.                 break;

  983.             case PIX_FMT_RGB32_1:

  984. #if HAVE_BIGENDIAN

  985.             case PIX_FMT_RGB24:

  986. #endif

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

  988.                 break;

  989.             case PIX_FMT_RGB32:

  990. #if !HAVE_BIGENDIAN

  991.             case PIX_FMT_BGR24:

  992. #endif

  993.             default:

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

  995.             }

  996.         }

  997.     }

  998. 

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

  1000.     if (c->sliceDir == 1) {

  1001.         // slices go from top to bottom

  1002.         int srcStride2[4] = { srcStride[0], srcStride[1], srcStride[2],

  1003.                               srcStride[3] };

  1004.         int dstStride2[4] = { dstStride[0], dstStride[1], dstStride[2],

  1005.                               dstStride[3] };

  1006. 

  1007.         reset_ptr(src2, c->srcFormat);

  1008.         reset_ptr((const uint8_t **) dst2, c->dstFormat);

  1009. 

  1010.         /* reset slice direction at end of frame */

  1011.         if (srcSliceY + srcSliceH == c->srcH)

  1012.             c->sliceDir = 0;

  1013. 

  1014.         return c->swScale(c, src2, srcStride2, srcSliceY, srcSliceH, dst2,

  1015.                           dstStride2);

  1016.     } else {

  1017.         // slices go from bottom to top => we flip the image internally

  1018.         int srcStride2[4] = { -srcStride[0], -srcStride[1], -srcStride[2],

  1019.                               -srcStride[3] };

  1020.         int dstStride2[4] = { -dstStride[0], -dstStride[1], -dstStride[2],

  1021.                               -dstStride[3] };

  1022. 

  1023.         src2[0] += (srcSliceH - 1) * srcStride[0];

  1024.         if (!usePal(c->srcFormat))

  1025.             src2[1] += ((srcSliceH >> c->chrSrcVSubSample) - 1) * srcStride[1];

  1026.         src2[2] += ((srcSliceH >> c->chrSrcVSubSample) - 1) * srcStride[2];

  1027.         src2[3] += (srcSliceH - 1) * srcStride[3];

  1028.         dst2[0] += ( c->dstH                         - 1) * dstStride[0];

  1029.         dst2[1] += ((c->dstH >> c->chrDstVSubSample) - 1) * dstStride[1];

  1030.         dst2[2] += ((c->dstH >> c->chrDstVSubSample) - 1) * dstStride[2];

  1031.         dst2[3] += ( c->dstH                         - 1) * dstStride[3];

  1032. 

  1033.         reset_ptr(src2, c->srcFormat);

  1034.         reset_ptr((const uint8_t **) dst2, c->dstFormat);

  1035. 

  1036.         /* reset slice direction at end of frame */

  1037.         if (!srcSliceY)

  1038.             c->sliceDir = 0;

  1039. 

  1040.         return c->swScale(c, src2, srcStride2, c->srcH-srcSliceY-srcSliceH,

  1041.                           srcSliceH, dst2, dstStride2);

  1042.     }

  1043. }

  1044. 

  1045. /* Convert the palette to the same packed 32-bit format as the palette */

  1046. void sws_convertPalette8ToPacked32(const uint8_t *src, uint8_t *dst,

  1047.                                    int num_pixels, const uint8_t *palette)

  1048. {

  1049.     int i;

  1050. 

  1051.     for (i = 0; i < num_pixels; i++)

  1052.         ((uint32_t *) dst)[i] = ((const uint32_t *) palette)[src[i]];

  1053. }

  1054. 

  1055. /* Palette format: ABCD -> dst format: ABC */

  1056. void sws_convertPalette8ToPacked24(const uint8_t *src, uint8_t *dst,

  1057.                                    int num_pixels, const uint8_t *palette)

  1058. {

  1059.     int i;

  1060. 

  1061.     for (i = 0; i < num_pixels; i++) {

  1062.         //FIXME slow?

  1063.         dst[0] = palette[src[i] * 4 + 0];

  1064.         dst[1] = palette[src[i] * 4 + 1];

  1065.         dst[2] = palette[src[i] * 4 + 2];

  1066.         dst += 3;

  1067.     }

  1068. }