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FFmpeg/libswscale/swscale_unscaled.c

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  1. /*

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

  3.  *

  4.  * This file is part of FFmpeg.

  5.  *

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

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

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

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

  10.  *

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

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

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

  14.  * Lesser General Public License for more details.

  15.  *

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

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

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

  19.  */

  20. 

  21. #include <inttypes.h>

  22. #include <string.h>

  23. #include <math.h>

  24. #include <stdio.h>

  25. #include "config.h"

  26. #include <assert.h>

  27. #include "swscale.h"

  28. #include "swscale_internal.h"

  29. #include "rgb2rgb.h"

  30. #include "libavutil/intreadwrite.h"

  31. #include "libavutil/cpu.h"

  32. #include "libavutil/avutil.h"

  33. #include "libavutil/mathematics.h"

  34. #include "libavutil/bswap.h"

  35. #include "libavutil/pixdesc.h"

  36. 

  37. #define RGB2YUV_SHIFT 15

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

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

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

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

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

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

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

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

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

  47. 

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

  49.                       uint8_t val)

  50. {

  51.     int i;

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

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

  54.         memset(ptr, val, width);

  55.         ptr += stride;

  56.     }

  57. }

  58. 

  59. static void fillPlane16(uint8_t *plane, int stride, int width, int height, int y,

  60.                       int alpha, int bits)

  61. {

  62.     int i, j;

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

  64.     int v = alpha ? -1 : (1<<bits);

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

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

  67.             AV_WN16(ptr+2*j, v);

  68.         }

  69.         ptr += stride;

  70.     }

  71. }

  72. 

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

  74.                       int srcSliceY, int srcSliceH, int width,

  75.                       uint8_t *dst, int dstStride)

  76. {

  77.     dst += dstStride * srcSliceY;

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

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

  80.     } else {

  81.         int i;

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

  83.             memcpy(dst, src, width);

  84.             src += srcStride;

  85.             dst += dstStride;

  86.         }

  87.     }

  88. }

  89. 

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

  91.                                int srcStride[], int srcSliceY,

  92.                                int srcSliceH, uint8_t *dstParam[],

  93.                                int dstStride[])

  94. {

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

  96. 

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

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

  99. 

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

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

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

  103.     else

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

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

  106. 

  107.     return srcSliceH;

  108. }

  109. 

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

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

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

  113. {

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

  115. 

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

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

  118. 

  119.     return srcSliceH;

  120. }

  121. 

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

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

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

  125. {

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

  127. 

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

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

  130. 

  131.     return srcSliceH;

  132. }

  133. 

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

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

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

  137. {

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

  139. 

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

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

  142. 

  143.     return srcSliceH;

  144. }

  145. 

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

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

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

  149. {

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

  151. 

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

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

  154. 

  155.     return srcSliceH;

  156. }

  157. 

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

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

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

  161. {

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

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

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

  165. 

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

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

  168. 

  169.     if (dstParam[3])

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

  171. 

  172.     return srcSliceH;

  173. }

  174. 

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

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

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

  178. {

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

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

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

  182. 

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

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

  185. 

  186.     return srcSliceH;

  187. }

  188. 

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

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

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

  192. {

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

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

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

  196. 

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

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

  199. 

  200.     if (dstParam[3])

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

  202. 

  203.     return srcSliceH;

  204. }

  205. 

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

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

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

  209. {

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

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

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

  213. 

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

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

  216. 

  217.     return srcSliceH;

  218. }

  219. 

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

  221.                              const uint8_t *palette)

  222. {

  223.     int i;

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

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

  226. }

  227. 

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

  229.                                const uint8_t *palette)

  230. {

  231.     int i;

  232. 

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

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

  235. }

  236. 

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

  238.                              const uint8_t *palette)

  239. {

  240.     int i;

  241. 

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

  243.         //FIXME slow?

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

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

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

  247.         dst += 3;

  248.     }

  249. }

  250. 

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

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

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

  254. {

  255.     int i, j;

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

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

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

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

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

  261. 

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

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

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

  265.         }

  266.         srcPtr += srcstr;

  267.         dstPtr += dststr;

  268.     }

  269. 

  270.     return srcSliceH;

  271. }

  272. 

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

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

  275.                            int dstStride[])

  276. {

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

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

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

  280.                  const uint8_t *palette) = NULL;

  281.     int i;

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

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

  284. 

  285.     if (srcFormat == PIX_FMT_GRAY8A) {

  286.         switch (dstFormat) {

  287.         case PIX_FMT_RGB32  : conv = gray8aToPacked32; break;

  288.         case PIX_FMT_BGR32  : conv = gray8aToPacked32; break;

  289.         case PIX_FMT_BGR32_1: conv = gray8aToPacked32_1; break;

  290.         case PIX_FMT_RGB32_1: conv = gray8aToPacked32_1; break;

  291.         case PIX_FMT_RGB24  : conv = gray8aToPacked24; break;

  292.         case PIX_FMT_BGR24  : conv = gray8aToPacked24; break;

  293.         }

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

  295.         switch (dstFormat) {

  296.         case PIX_FMT_RGB32  : conv = sws_convertPalette8ToPacked32; break;

  297.         case PIX_FMT_BGR32  : conv = sws_convertPalette8ToPacked32; break;

  298.         case PIX_FMT_BGR32_1: conv = sws_convertPalette8ToPacked32; break;

  299.         case PIX_FMT_RGB32_1: conv = sws_convertPalette8ToPacked32; break;

  300.         case PIX_FMT_RGB24  : conv = sws_convertPalette8ToPacked24; break;

  301.         case PIX_FMT_BGR24  : conv = sws_convertPalette8ToPacked24; break;

  302.         }

  303.     }

  304. 

  305.     if (!conv)

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

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

  308.     else {

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

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

  311.             srcPtr += srcStride[0];

  312.             dstPtr += dstStride[0];

  313.         }

  314.     }

  315. 

  316.     return srcSliceH;

  317. }

  318. 

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

  320. {

  321.     int x, h, i;

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

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

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

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

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

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

  328.         }

  329. 

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

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

  332.     }

  333. }

  334. 

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

  336. {

  337.     int x, h, i;

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

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

  340. 

  341.         if (alpha_first) {

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

  343.                 *dest++ = 0xff;

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

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

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

  347.             }

  348.         } else {

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

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

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

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

  353.                 *dest++ = 0xff;

  354.             }

  355.         }

  356. 

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

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

  359.     }

  360. }

  361. 

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

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

  364. {

  365.     int alpha_first = 0;

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

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

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

  369.         return srcSliceH;

  370.     }

  371. 

  372.     switch (c->dstFormat) {

  373.         case PIX_FMT_BGR24:

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

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

  376.             break;

  377. 

  378.         case PIX_FMT_RGB24:

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

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

  381.             break;

  382. 

  383.         case PIX_FMT_ARGB:

  384.             alpha_first = 1;

  385.         case PIX_FMT_RGBA:

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

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

  388.             break;

  389. 

  390.         case PIX_FMT_ABGR:

  391.             alpha_first = 1;

  392.         case PIX_FMT_BGRA:

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

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

  395.             break;

  396. 

  397.         default:

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

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

  400.     }

  401. 

  402.     return srcSliceH;

  403. }

  404. 

  405. #define isRGBA32(x) (            \

  406.            (x) == PIX_FMT_ARGB   \

  407.         || (x) == PIX_FMT_RGBA   \

  408.         || (x) == PIX_FMT_BGRA   \

  409.         || (x) == PIX_FMT_ABGR   \

  410.         )

  411. 

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

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

  414. static rgbConvFn findRgbConvFn(SwsContext *c)

  415. {

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

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

  418.     const int srcId = c->srcFormatBpp;

  419.     const int dstId = c->dstFormatBpp;

  420.     rgbConvFn conv = NULL;

  421. 

  422. #define IS_NOT_NE(bpp, fmt) \

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

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

  425. 

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

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

  428.         return NULL;

  429. 

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

  431. 

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

  433.         if (     CONV_IS(ABGR, RGBA)

  434.               || CONV_IS(ARGB, BGRA)

  435.               || CONV_IS(BGRA, ARGB)

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

  437.         else if (CONV_IS(ABGR, ARGB)

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

  439.         else if (CONV_IS(ABGR, BGRA)

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

  441.         else if (CONV_IS(BGRA, RGBA)

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

  443.         else if (CONV_IS(BGRA, ABGR)

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

  445.     } else

  446.     /* BGR -> BGR */

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

  463.         }

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

  483.         }

  484.     }

  485. 

  486.     return conv;

  487. }

  488. 

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

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

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

  492.                            int dstStride[])

  493. 

  494. {

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

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

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

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

  499.     rgbConvFn conv = findRgbConvFn(c);

  500. 

  501.     if (!conv) {

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

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

  504.     } else {

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

  506.               uint8_t *dstPtr = dst[0];

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

  508.             !isRGBA32(dstFormat))

  509.             srcPtr += ALT32_CORR;

  510. 

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

  512.             !isRGBA32(srcFormat))

  513.             dstPtr += ALT32_CORR;

  514. 

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

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

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

  518.                  srcSliceH * srcStride[0]);

  519.         else {

  520.             int i;

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

  522. 

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

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

  525.                 srcPtr += srcStride[0];

  526.                 dstPtr += dstStride[0];

  527.             }

  528.         }

  529.     }

  530.     return srcSliceH;

  531. }

  532. 

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

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

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

  536. {

  537.     rgb24toyv12(

  538.         src[0],

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

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

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

  542.         c->srcW, srcSliceH,

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

  544.     if (dst[3])

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

  546.     return srcSliceH;

  547. }

  548. 

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

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

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

  552. {

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

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

  555. 

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

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

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

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

  560.     if (dst[3])

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

  562.     return srcSliceH;

  563. }

  564. 

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

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

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

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

  569. {

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

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

  572.     else {

  573.         int i;

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

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

  576.         int length = 0;

  577. 

  578.         /* universal length finder */

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

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

  581.             length += c->srcW;

  582.         assert(length != 0);

  583. 

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

  585.             memcpy(dstPtr, srcPtr, length);

  586.             srcPtr += srcStride[0];

  587.             dstPtr += dstStride[0];

  588.         }

  589.     }

  590.     return srcSliceH;

  591. }

  592. 

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

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

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

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

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

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

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

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

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

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

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

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

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

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

  607.         }\

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

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

  610.         dst += dstStride;\

  611.         src += srcStride;\

  612.     }

  613. 

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

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

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

  617. {

  618.     int plane, i, j;

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

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

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

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

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

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

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

  626. 

  627.         if (!dst[plane])

  628.             continue;

  629.         // ignore palette for GRAY8

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

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

  632.             if (is16BPS(c->dstFormat) || isNBPS(c->dstFormat)) {

  633.                 fillPlane16(dst[plane], dstStride[plane], length, height, y,

  634.                         plane == 3, av_pix_fmt_descriptors[c->dstFormat].comp[plane].depth_minus1);

  635.             } else {

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

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

  638.             }

  639.         } else {

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

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

  642.             ) {

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

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

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

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

  647. 

  648.                 if (dst_depth == 8) {

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

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

  651.                     } else {

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

  653.                     }

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

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

  656.                         #define COPY816(w)\

  657.                         if(shiftonly){\

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

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

  660.                         }else{\

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

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

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

  664.                         }

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

  666.                             COPY816(AV_WB16)

  667.                         } else {

  668.                             COPY816(AV_WL16)

  669.                         }

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

  671.                         srcPtr  += srcStride[plane];

  672.                     }

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

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

  675. #define COPY_UP(r,w) \

  676.     if(shiftonly){\

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

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

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

  680.         }\

  681.     }else{\

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

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

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

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

  686.         }\

  687.     }

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

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

  690.                                 COPY_UP(AV_RB16, AV_WB16)

  691.                             } else {

  692.                                 COPY_UP(AV_RB16, AV_WL16)

  693.                             }

  694.                         } else {

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

  696.                                 COPY_UP(AV_RL16, AV_WB16)

  697.                             } else {

  698.                                 COPY_UP(AV_RL16, AV_WL16)

  699.                             }

  700.                         }

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

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

  703.                     }

  704.                 } else {

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

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

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

  708.                         } else {

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

  710.                         }

  711.                     }else{

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

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

  714.                         } else {

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

  716.                         }

  717.                     }

  718.                 }

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

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

  721. 

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

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

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

  725.                     srcPtr += srcStride[plane];

  726.                     dstPtr += dstStride[plane];

  727.                 }

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

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

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

  731.                        height * dstStride[plane]);

  732.             } else {

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

  734.                     length *= 2;

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

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

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

  738.                     memcpy(dstPtr, srcPtr, length);

  739.                     srcPtr += srcStride[plane];

  740.                     dstPtr += dstStride[plane];

  741.                 }

  742.             }

  743.         }

  744.     }

  745.     return srcSliceH;

  746. }

  747. 

  748. 

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

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

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

  752. 

  753. 

  754. void ff_get_unscaled_swscale(SwsContext *c)

  755. {

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

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

  758.     const int flags = c->flags;

  759.     const int dstH = c->dstH;

  760.     int needsDither;

  761. 

  762.     needsDither = isAnyRGB(dstFormat) &&

  763.             c->dstFormatBpp < 24 &&

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

  765. 

  766.     /* yv12_to_nv12 */

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

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

  769.         c->swScale = planarToNv12Wrapper;

  770.     }

  771.     /* yuv2bgr */

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

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

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

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

  776.     }

  777. 

  778.     if (srcFormat == PIX_FMT_YUV410P &&

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

  780.         !(flags & SWS_BITEXACT)) {

  781.         c->swScale = yvu9ToYv12Wrapper;

  782.     }

  783. 

  784.     /* bgr24toYV12 */

  785.     if (srcFormat == PIX_FMT_BGR24 &&

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

  787.         !(flags & SWS_ACCURATE_RND))

  788.         c->swScale = bgr24ToYv12Wrapper;

  789. 

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

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

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

  793.         c->swScale= rgbToRgbWrapper;

  794. 

  795. #define isByteRGB(f) (\

  796.         f == PIX_FMT_RGB32   ||\

  797.         f == PIX_FMT_RGB32_1 ||\

  798.         f == PIX_FMT_RGB24   ||\

  799.         f == PIX_FMT_BGR32   ||\

  800.         f == PIX_FMT_BGR32_1 ||\

  801.         f == PIX_FMT_BGR24)

  802. 

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

  804.         c->swScale= planarRgbToRgbWrapper;

  805. 

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

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

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

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

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

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

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

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

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

  815.         IS_DIFFERENT_ENDIANESS(srcFormat, dstFormat, PIX_FMT_RGB565))

  816.         c->swScale = packed_16bpc_bswap;

  817. 

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

  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. #define isPlanarGray(x) (isGray(x) && (x) != PIX_FMT_GRAY8A)

  850.     /* simple copy */

  851.     if ( srcFormat == dstFormat ||

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

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

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

  855.         (isPlanarYUV(dstFormat) && isPlanarGray(srcFormat)) ||

  856.         (isPlanarGray(dstFormat) && isPlanarGray(srcFormat)) ||

  857.         (isPlanarYUV(srcFormat) && isPlanarYUV(dstFormat) &&

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

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

  860.          dstFormat != PIX_FMT_NV12 && dstFormat != PIX_FMT_NV21 &&

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

  862.     {

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

  864.             c->swScale = packedCopyWrapper;

  865.         else /* Planar YUV or gray */

  866.             c->swScale = planarCopyWrapper;

  867.     }

  868. 

  869.     if (ARCH_BFIN)

  870.         ff_bfin_get_unscaled_swscale(c);

  871.     if (HAVE_ALTIVEC)

  872.         ff_swscale_get_unscaled_altivec(c);

  873. }

  874. 

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

  876. {

  877.     if (!isALPHA(format))

  878.         src[3] = NULL;

  879.     if (!isPlanar(format)) {

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

  881. 

  882.         if (!usePal(format))

  883.             src[1] = NULL;

  884.     }

  885. }

  886. 

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

  888.                                 const int linesizes[4])

  889. {

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

  891.     int i;

  892. 

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

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

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

  896.             return 0;

  897.     }

  898. 

  899.     return 1;

  900. }

  901. 

  902. /**

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

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

  905.  */

  906. int attribute_align_arg sws_scale(struct SwsContext *c,

  907.                                   const uint8_t * const srcSlice[],

  908.                                   const int srcStride[], int srcSliceY,

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

  910.                                   const int dstStride[])

  911. {

  912.     int i, ret;

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

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

  915.     uint8_t *rgb0_tmp = NULL;

  916. 

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

  918.     if (srcSliceH == 0)

  919.         return 0;

  920. 

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

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

  923.         return 0;

  924.     }

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

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

  927.         return 0;

  928.     }

  929. 

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

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

  932.         return 0;

  933.     }

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

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

  936.     }

  937. 

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

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

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

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

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

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

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

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

  946.                 b =  p        & 0xFF;

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

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

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

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

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

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

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

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

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

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

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

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

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

  960.                 r = g = b = i;

  961.             } else {

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

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

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

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

  966.             }

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

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

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

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

  971. 

  972.             switch (c->dstFormat) {

  973.             case PIX_FMT_BGR32:

  974. #if !HAVE_BIGENDIAN

  975.             case PIX_FMT_RGB24:

  976. #endif

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

  978.                 break;

  979.             case PIX_FMT_BGR32_1:

  980. #if HAVE_BIGENDIAN

  981.             case PIX_FMT_BGR24:

  982. #endif

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

  984.                 break;

  985.             case PIX_FMT_RGB32_1:

  986. #if HAVE_BIGENDIAN

  987.             case PIX_FMT_RGB24:

  988. #endif

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

  990.                 break;

  991.             case PIX_FMT_RGB32:

  992. #if !HAVE_BIGENDIAN

  993.             case PIX_FMT_BGR24:

  994. #endif

  995.             default:

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

  997.             }

  998.         }

  999.     }

  1000. 

  1001.     if (c->src0Alpha && !c->dst0Alpha && isALPHA(c->dstFormat)) {

  1002.         uint8_t *base;

  1003.         int x,y;

  1004.         rgb0_tmp = av_malloc(FFABS(srcStride[0]) * srcSliceH + 32);

  1005.         base = srcStride[0] < 0 ? rgb0_tmp - srcStride[0] * (srcSliceH-1) : rgb0_tmp;

  1006.         for (y=0; y<srcSliceH; y++){

  1007.             memcpy(base + srcStride[0]*y, src2[0] + srcStride[0]*y, 4*c->srcW);

  1008.             for (x=c->src0Alpha-1; x<4*c->srcW; x+=4) {

  1009.                 base[ srcStride[0]*y + x] = 0xFF;

  1010.             }

  1011.         }

  1012.         src2[0] = base;

  1013.     }

  1014. 

  1015.     // copy strides, so they can safely be modified

  1016.     if (c->sliceDir == 1) {

  1017.         // slices go from top to bottom

  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.         reset_ptr(src2, c->srcFormat);

  1024.         reset_ptr((void*)dst2, c->dstFormat);

  1025. 

  1026.         /* reset slice direction at end of frame */

  1027.         if (srcSliceY + srcSliceH == c->srcH)

  1028.             c->sliceDir = 0;

  1029. 

  1030.         ret = c->swScale(c, src2, srcStride2, srcSliceY, srcSliceH, dst2,

  1031.                           dstStride2);

  1032.     } else {

  1033.         // slices go from bottom to top => we flip the image internally

  1034.         int srcStride2[4] = { -srcStride[0], -srcStride[1], -srcStride[2],

  1035.                               -srcStride[3] };

  1036.         int dstStride2[4] = { -dstStride[0], -dstStride[1], -dstStride[2],

  1037.                               -dstStride[3] };

  1038. 

  1039.         src2[0] += (srcSliceH - 1) * srcStride[0];

  1040.         if (!usePal(c->srcFormat))

  1041.             src2[1] += ((srcSliceH >> c->chrSrcVSubSample) - 1) * srcStride[1];

  1042.         src2[2] += ((srcSliceH >> c->chrSrcVSubSample) - 1) * srcStride[2];

  1043.         src2[3] += (srcSliceH - 1) * srcStride[3];

  1044.         dst2[0] += ( c->dstH                         - 1) * dstStride[0];

  1045.         dst2[1] += ((c->dstH >> c->chrDstVSubSample) - 1) * dstStride[1];

  1046.         dst2[2] += ((c->dstH >> c->chrDstVSubSample) - 1) * dstStride[2];

  1047.         dst2[3] += ( c->dstH                         - 1) * dstStride[3];

  1048. 

  1049.         reset_ptr(src2, c->srcFormat);

  1050.         reset_ptr((void*)dst2, c->dstFormat);

  1051. 

  1052.         /* reset slice direction at end of frame */

  1053.         if (!srcSliceY)

  1054.             c->sliceDir = 0;

  1055. 

  1056.         ret = c->swScale(c, src2, srcStride2, c->srcH-srcSliceY-srcSliceH,

  1057.                           srcSliceH, dst2, dstStride2);

  1058.     }

  1059. 

  1060.     av_free(rgb0_tmp);

  1061.     return ret;

  1062. }

  1063. 

  1064. /* Convert the palette to the same packed 32-bit format as the palette */

  1065. void sws_convertPalette8ToPacked32(const uint8_t *src, uint8_t *dst,

  1066.                                    int num_pixels, const uint8_t *palette)

  1067. {

  1068.     int i;

  1069. 

  1070.     for (i = 0; i < num_pixels; i++)

  1071.         ((uint32_t *) dst)[i] = ((const uint32_t *) palette)[src[i]];

  1072. }

  1073. 

  1074. /* Palette format: ABCD -> dst format: ABC */

  1075. void sws_convertPalette8ToPacked24(const uint8_t *src, uint8_t *dst,

  1076.                                    int num_pixels, const uint8_t *palette)

  1077. {

  1078.     int i;

  1079. 

  1080.     for (i = 0; i < num_pixels; i++) {

  1081.         //FIXME slow?

  1082.         dst[0] = palette[src[i] * 4 + 0];

  1083.         dst[1] = palette[src[i] * 4 + 1];

  1084.         dst[2] = palette[src[i] * 4 + 2];

  1085.         dst += 3;

  1086.     }

  1087. }