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FFmpeg/libswscale/swscale.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 <assert.h>

  22. #include <inttypes.h>

  23. #include <math.h>

  24. #include <stdio.h>

  25. #include <string.h>

  26. 

  27. #include "libavutil/avutil.h"

  28. #include "libavutil/bswap.h"

  29. #include "libavutil/cpu.h"

  30. #include "libavutil/intreadwrite.h"

  31. #include "libavutil/mathematics.h"

  32. #include "libavutil/pixdesc.h"

  33. #include "config.h"

  34. #include "rgb2rgb.h"

  35. #include "swscale_internal.h"

  36. #include "swscale.h"

  37. 

  38. DECLARE_ALIGNED(8, const uint8_t, ff_dither_8x8_128)[8][8] = {

  39.     {  36, 68,  60, 92,  34, 66,  58, 90, },

  40.     { 100,  4, 124, 28,  98,  2, 122, 26, },

  41.     {  52, 84,  44, 76,  50, 82,  42, 74, },

  42.     { 116, 20, 108, 12, 114, 18, 106, 10, },

  43.     {  32, 64,  56, 88,  38, 70,  62, 94, },

  44.     {  96,  0, 120, 24, 102,  6, 126, 30, },

  45.     {  48, 80,  40, 72,  54, 86,  46, 78, },

  46.     { 112, 16, 104,  8, 118, 22, 110, 14, },

  47. };

  48. 

  49. DECLARE_ALIGNED(8, static const uint8_t, sws_pb_64)[8] = {

  50.     64, 64, 64, 64, 64, 64, 64, 64

  51. };

  52. 

  53. static av_always_inline void fillPlane(uint8_t *plane, int stride, int width,

  54.                                        int height, int y, uint8_t val)

  55. {

  56.     int i;

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

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

  59.         memset(ptr, val, width);

  60.         ptr += stride;

  61.     }

  62. }

  63. 

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

  65.                             int height, int y, uint8_t val,

  66.                             const int dst_depth, const int big_endian)

  67. {

  68.     int i, j;

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

  70. #define FILL8TO9_OR_10(wfunc) \

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

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

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

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

  75.         } \

  76.         dst += stride / 2; \

  77.     }

  78.     if (big_endian) {

  79.         FILL8TO9_OR_10(AV_WB16);

  80.     } else {

  81.         FILL8TO9_OR_10(AV_WL16);

  82.     }

  83. }

  84. 

  85. 

  86. static void hScale16To19_c(SwsContext *c, int16_t *_dst, int dstW,

  87.                            const uint8_t *_src, const int16_t *filter,

  88.                            const int32_t *filterPos, int filterSize)

  89. {

  90.     const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(c->srcFormat);

  91.     int i;

  92.     int32_t *dst        = (int32_t *) _dst;

  93.     const uint16_t *src = (const uint16_t *) _src;

  94.     int bits            = desc->comp[0].depth - 1;

  95.     int sh              = bits - 4;

  96. 

  97.     for (i = 0; i < dstW; i++) {

  98.         int j;

  99.         int srcPos = filterPos[i];

  100.         int val    = 0;

  101. 

  102.         for (j = 0; j < filterSize; j++) {

  103.             val += src[srcPos + j] * filter[filterSize * i + j];

  104.         }

  105.         // filter=14 bit, input=16 bit, output=30 bit, >> 11 makes 19 bit

  106.         dst[i] = FFMIN(val >> sh, (1 << 19) - 1);

  107.     }

  108. }

  109. 

  110. static void hScale16To15_c(SwsContext *c, int16_t *dst, int dstW,

  111.                            const uint8_t *_src, const int16_t *filter,

  112.                            const int32_t *filterPos, int filterSize)

  113. {

  114.     const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(c->srcFormat);

  115.     int i;

  116.     const uint16_t *src = (const uint16_t *) _src;

  117.     int sh              = desc->comp[0].depth - 1;

  118. 

  119.     for (i = 0; i < dstW; i++) {

  120.         int j;

  121.         int srcPos = filterPos[i];

  122.         int val    = 0;

  123. 

  124.         for (j = 0; j < filterSize; j++) {

  125.             val += src[srcPos + j] * filter[filterSize * i + j];

  126.         }

  127.         // filter=14 bit, input=16 bit, output=30 bit, >> 15 makes 15 bit

  128.         dst[i] = FFMIN(val >> sh, (1 << 15) - 1);

  129.     }

  130. }

  131. 

  132. // bilinear / bicubic scaling

  133. static void hScale8To15_c(SwsContext *c, int16_t *dst, int dstW,

  134.                           const uint8_t *src, const int16_t *filter,

  135.                           const int32_t *filterPos, int filterSize)

  136. {

  137.     int i;

  138.     for (i = 0; i < dstW; i++) {

  139.         int j;

  140.         int srcPos = filterPos[i];

  141.         int val    = 0;

  142.         for (j = 0; j < filterSize; j++) {

  143.             val += ((int)src[srcPos + j]) * filter[filterSize * i + j];

  144.         }

  145.         dst[i] = FFMIN(val >> 7, (1 << 15) - 1); // the cubic equation does overflow ...

  146.     }

  147. }

  148. 

  149. static void hScale8To19_c(SwsContext *c, int16_t *_dst, int dstW,

  150.                           const uint8_t *src, const int16_t *filter,

  151.                           const int32_t *filterPos, int filterSize)

  152. {

  153.     int i;

  154.     int32_t *dst = (int32_t *) _dst;

  155.     for (i = 0; i < dstW; i++) {

  156.         int j;

  157.         int srcPos = filterPos[i];

  158.         int val    = 0;

  159.         for (j = 0; j < filterSize; j++) {

  160.             val += ((int)src[srcPos + j]) * filter[filterSize * i + j];

  161.         }

  162.         dst[i] = FFMIN(val >> 3, (1 << 19) - 1); // the cubic equation does overflow ...

  163.     }

  164. }

  165. 

  166. // FIXME all pal and rgb srcFormats could do this conversion as well

  167. // FIXME all scalers more complex than bilinear could do half of this transform

  168. static void chrRangeToJpeg_c(int16_t *dstU, int16_t *dstV, int width)

  169. {

  170.     int i;

  171.     for (i = 0; i < width; i++) {

  172.         dstU[i] = (FFMIN(dstU[i], 30775) * 4663 - 9289992) >> 12; // -264

  173.         dstV[i] = (FFMIN(dstV[i], 30775) * 4663 - 9289992) >> 12; // -264

  174.     }

  175. }

  176. 

  177. static void chrRangeFromJpeg_c(int16_t *dstU, int16_t *dstV, int width)

  178. {

  179.     int i;

  180.     for (i = 0; i < width; i++) {

  181.         dstU[i] = (dstU[i] * 1799 + 4081085) >> 11; // 1469

  182.         dstV[i] = (dstV[i] * 1799 + 4081085) >> 11; // 1469

  183.     }

  184. }

  185. 

  186. static void lumRangeToJpeg_c(int16_t *dst, int width)

  187. {

  188.     int i;

  189.     for (i = 0; i < width; i++)

  190.         dst[i] = (FFMIN(dst[i], 30189) * 19077 - 39057361) >> 14;

  191. }

  192. 

  193. static void lumRangeFromJpeg_c(int16_t *dst, int width)

  194. {

  195.     int i;

  196.     for (i = 0; i < width; i++)

  197.         dst[i] = (dst[i] * 14071 + 33561947) >> 14;

  198. }

  199. 

  200. static void chrRangeToJpeg16_c(int16_t *_dstU, int16_t *_dstV, int width)

  201. {

  202.     int i;

  203.     int32_t *dstU = (int32_t *) _dstU;

  204.     int32_t *dstV = (int32_t *) _dstV;

  205.     for (i = 0; i < width; i++) {

  206.         dstU[i] = (FFMIN(dstU[i], 30775 << 4) * 4663 - (9289992 << 4)) >> 12; // -264

  207.         dstV[i] = (FFMIN(dstV[i], 30775 << 4) * 4663 - (9289992 << 4)) >> 12; // -264

  208.     }

  209. }

  210. 

  211. static void chrRangeFromJpeg16_c(int16_t *_dstU, int16_t *_dstV, int width)

  212. {

  213.     int i;

  214.     int32_t *dstU = (int32_t *) _dstU;

  215.     int32_t *dstV = (int32_t *) _dstV;

  216.     for (i = 0; i < width; i++) {

  217.         dstU[i] = (dstU[i] * 1799 + (4081085 << 4)) >> 11; // 1469

  218.         dstV[i] = (dstV[i] * 1799 + (4081085 << 4)) >> 11; // 1469

  219.     }

  220. }

  221. 

  222. static void lumRangeToJpeg16_c(int16_t *_dst, int width)

  223. {

  224.     int i;

  225.     int32_t *dst = (int32_t *) _dst;

  226.     for (i = 0; i < width; i++)

  227.         dst[i] = (FFMIN(dst[i], 30189 << 4) * 4769 - (39057361 << 2)) >> 12;

  228. }

  229. 

  230. static void lumRangeFromJpeg16_c(int16_t *_dst, int width)

  231. {

  232.     int i;

  233.     int32_t *dst = (int32_t *) _dst;

  234.     for (i = 0; i < width; i++)

  235.         dst[i] = (dst[i] * 14071 + (33561947 << 4)) >> 14;

  236. }

  237. 

  238. static void hyscale_fast_c(SwsContext *c, int16_t *dst, int dstWidth,

  239.                            const uint8_t *src, int srcW, int xInc)

  240. {

  241.     int i;

  242.     unsigned int xpos = 0;

  243.     for (i = 0; i < dstWidth; i++) {

  244.         register unsigned int xx     = xpos >> 16;

  245.         register unsigned int xalpha = (xpos & 0xFFFF) >> 9;

  246.         dst[i] = (src[xx] << 7) + (src[xx + 1] - src[xx]) * xalpha;

  247.         xpos  += xInc;

  248.     }

  249. }

  250. 

  251. // *** horizontal scale Y line to temp buffer

  252. static av_always_inline void hyscale(SwsContext *c, int16_t *dst, int dstWidth,

  253.                                      const uint8_t *src_in[4],

  254.                                      int srcW, int xInc,

  255.                                      const int16_t *hLumFilter,

  256.                                      const int32_t *hLumFilterPos,

  257.                                      int hLumFilterSize,

  258.                                      uint8_t *formatConvBuffer,

  259.                                      uint32_t *pal, int isAlpha)

  260. {

  261.     void (*toYV12)(uint8_t *, const uint8_t *, int, uint32_t *) =

  262.         isAlpha ? c->alpToYV12 : c->lumToYV12;

  263.     void (*convertRange)(int16_t *, int) = isAlpha ? NULL : c->lumConvertRange;

  264.     const uint8_t *src = src_in[isAlpha ? 3 : 0];

  265. 

  266.     if (toYV12) {

  267.         toYV12(formatConvBuffer, src, srcW, pal);

  268.         src = formatConvBuffer;

  269.     } else if (c->readLumPlanar && !isAlpha) {

  270.         c->readLumPlanar(formatConvBuffer, src_in, srcW);

  271.         src = formatConvBuffer;

  272.     } else if (c->readAlpPlanar && isAlpha) {

  273.         c->readAlpPlanar(formatConvBuffer, src_in, srcW);

  274.         src = formatConvBuffer;

  275.     }

  276. 

  277.     if (!c->hyscale_fast) {

  278.         c->hyScale(c, dst, dstWidth, src, hLumFilter,

  279.                    hLumFilterPos, hLumFilterSize);

  280.     } else { // fast bilinear upscale / crap downscale

  281.         c->hyscale_fast(c, dst, dstWidth, src, srcW, xInc);

  282.     }

  283. 

  284.     if (convertRange)

  285.         convertRange(dst, dstWidth);

  286. }

  287. 

  288. static void hcscale_fast_c(SwsContext *c, int16_t *dst1, int16_t *dst2,

  289.                            int dstWidth, const uint8_t *src1,

  290.                            const uint8_t *src2, int srcW, int xInc)

  291. {

  292.     int i;

  293.     unsigned int xpos = 0;

  294.     for (i = 0; i < dstWidth; i++) {

  295.         register unsigned int xx     = xpos >> 16;

  296.         register unsigned int xalpha = (xpos & 0xFFFF) >> 9;

  297.         dst1[i] = (src1[xx] * (xalpha ^ 127) + src1[xx + 1] * xalpha);

  298.         dst2[i] = (src2[xx] * (xalpha ^ 127) + src2[xx + 1] * xalpha);

  299.         xpos   += xInc;

  300.     }

  301. }

  302. 

  303. static av_always_inline void hcscale(SwsContext *c, int16_t *dst1,

  304.                                      int16_t *dst2, int dstWidth,

  305.                                      const uint8_t *src_in[4],

  306.                                      int srcW, int xInc,

  307.                                      const int16_t *hChrFilter,

  308.                                      const int32_t *hChrFilterPos,

  309.                                      int hChrFilterSize,

  310.                                      uint8_t *formatConvBuffer, uint32_t *pal)

  311. {

  312.     const uint8_t *src1 = src_in[1], *src2 = src_in[2];

  313.     if (c->chrToYV12) {

  314.         uint8_t *buf2 = formatConvBuffer +

  315.                         FFALIGN(srcW * FFALIGN(c->srcBpc, 8) >> 3, 16);

  316.         c->chrToYV12(formatConvBuffer, buf2, src1, src2, srcW, pal);

  317.         src1 = formatConvBuffer;

  318.         src2 = buf2;

  319.     } else if (c->readChrPlanar) {

  320.         uint8_t *buf2 = formatConvBuffer +

  321.                         FFALIGN(srcW * FFALIGN(c->srcBpc, 8) >> 3, 16);

  322.         c->readChrPlanar(formatConvBuffer, buf2, src_in, srcW);

  323.         src1 = formatConvBuffer;

  324.         src2 = buf2;

  325.     }

  326. 

  327.     if (!c->hcscale_fast) {

  328.         c->hcScale(c, dst1, dstWidth, src1, hChrFilter, hChrFilterPos, hChrFilterSize);

  329.         c->hcScale(c, dst2, dstWidth, src2, hChrFilter, hChrFilterPos, hChrFilterSize);

  330.     } else { // fast bilinear upscale / crap downscale

  331.         c->hcscale_fast(c, dst1, dst2, dstWidth, src1, src2, srcW, xInc);

  332.     }

  333. 

  334.     if (c->chrConvertRange)

  335.         c->chrConvertRange(dst1, dst2, dstWidth);

  336. }

  337. 

  338. #define DEBUG_SWSCALE_BUFFERS 0

  339. #define DEBUG_BUFFERS(...)                      \

  340.     if (DEBUG_SWSCALE_BUFFERS)                  \

  341.         av_log(c, AV_LOG_DEBUG, __VA_ARGS__)

  342. 

  343. static int swscale(SwsContext *c, const uint8_t *src[],

  344.                    int srcStride[], int srcSliceY,

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

  346. {

  347.     /* load a few things into local vars to make the code more readable?

  348.      * and faster */

  349.     const int srcW                   = c->srcW;

  350.     const int dstW                   = c->dstW;

  351.     const int dstH                   = c->dstH;

  352.     const int chrDstW                = c->chrDstW;

  353.     const int chrSrcW                = c->chrSrcW;

  354.     const int lumXInc                = c->lumXInc;

  355.     const int chrXInc                = c->chrXInc;

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

  357.     const int flags                  = c->flags;

  358.     int32_t *vLumFilterPos           = c->vLumFilterPos;

  359.     int32_t *vChrFilterPos           = c->vChrFilterPos;

  360.     int32_t *hLumFilterPos           = c->hLumFilterPos;

  361.     int32_t *hChrFilterPos           = c->hChrFilterPos;

  362.     int16_t *vLumFilter              = c->vLumFilter;

  363.     int16_t *vChrFilter              = c->vChrFilter;

  364.     int16_t *hLumFilter              = c->hLumFilter;

  365.     int16_t *hChrFilter              = c->hChrFilter;

  366.     int32_t *lumMmxFilter            = c->lumMmxFilter;

  367.     int32_t *chrMmxFilter            = c->chrMmxFilter;

  368.     const int vLumFilterSize         = c->vLumFilterSize;

  369.     const int vChrFilterSize         = c->vChrFilterSize;

  370.     const int hLumFilterSize         = c->hLumFilterSize;

  371.     const int hChrFilterSize         = c->hChrFilterSize;

  372.     int16_t **lumPixBuf              = c->lumPixBuf;

  373.     int16_t **chrUPixBuf             = c->chrUPixBuf;

  374.     int16_t **chrVPixBuf             = c->chrVPixBuf;

  375.     int16_t **alpPixBuf              = c->alpPixBuf;

  376.     const int vLumBufSize            = c->vLumBufSize;

  377.     const int vChrBufSize            = c->vChrBufSize;

  378.     uint8_t *formatConvBuffer        = c->formatConvBuffer;

  379.     uint32_t *pal                    = c->pal_yuv;

  380.     yuv2planar1_fn yuv2plane1        = c->yuv2plane1;

  381.     yuv2planarX_fn yuv2planeX        = c->yuv2planeX;

  382.     yuv2interleavedX_fn yuv2nv12cX   = c->yuv2nv12cX;

  383.     yuv2packed1_fn yuv2packed1       = c->yuv2packed1;

  384.     yuv2packed2_fn yuv2packed2       = c->yuv2packed2;

  385.     yuv2packedX_fn yuv2packedX       = c->yuv2packedX;

  386.     yuv2anyX_fn yuv2anyX             = c->yuv2anyX;

  387.     const int chrSrcSliceY           =                srcSliceY >> c->chrSrcVSubSample;

  388.     const int chrSrcSliceH           = AV_CEIL_RSHIFT(srcSliceH,   c->chrSrcVSubSample);

  389.     int should_dither                = is9_15BPS(c->srcFormat) ||

  390.                                        is16BPS(c->srcFormat);

  391.     int lastDstY;

  392. 

  393.     /* vars which will change and which we need to store back in the context */

  394.     int dstY         = c->dstY;

  395.     int lumBufIndex  = c->lumBufIndex;

  396.     int chrBufIndex  = c->chrBufIndex;

  397.     int lastInLumBuf = c->lastInLumBuf;

  398.     int lastInChrBuf = c->lastInChrBuf;

  399. 

  400.     if (isPacked(c->srcFormat)) {

  401.         src[0] =

  402.         src[1] =

  403.         src[2] =

  404.         src[3] = src[0];

  405.         srcStride[0] =

  406.         srcStride[1] =

  407.         srcStride[2] =

  408.         srcStride[3] = srcStride[0];

  409.     }

  410.     srcStride[1] <<= c->vChrDrop;

  411.     srcStride[2] <<= c->vChrDrop;

  412. 

  413.     DEBUG_BUFFERS("swscale() %p[%d] %p[%d] %p[%d] %p[%d] -> %p[%d] %p[%d] %p[%d] %p[%d]\n",

  414.                   src[0], srcStride[0], src[1], srcStride[1],

  415.                   src[2], srcStride[2], src[3], srcStride[3],

  416.                   dst[0], dstStride[0], dst[1], dstStride[1],

  417.                   dst[2], dstStride[2], dst[3], dstStride[3]);

  418.     DEBUG_BUFFERS("srcSliceY: %d srcSliceH: %d dstY: %d dstH: %d\n",

  419.                   srcSliceY, srcSliceH, dstY, dstH);

  420.     DEBUG_BUFFERS("vLumFilterSize: %d vLumBufSize: %d vChrFilterSize: %d vChrBufSize: %d\n",

  421.                   vLumFilterSize, vLumBufSize, vChrFilterSize, vChrBufSize);

  422. 

  423.     if (dstStride[0] % 8 != 0 || dstStride[1] % 8 != 0 ||

  424.         dstStride[2] % 8 != 0 || dstStride[3] % 8 != 0) {

  425.         static int warnedAlready = 0; // FIXME maybe move this into the context

  426.         if (flags & SWS_PRINT_INFO && !warnedAlready) {

  427.             av_log(c, AV_LOG_WARNING,

  428.                    "Warning: dstStride is not aligned!\n"

  429.                    "         ->cannot do aligned memory accesses anymore\n");

  430.             warnedAlready = 1;

  431.         }

  432.     }

  433. 

  434.     /* Note the user might start scaling the picture in the middle so this

  435.      * will not get executed. This is not really intended but works

  436.      * currently, so people might do it. */

  437.     if (srcSliceY == 0) {

  438.         lumBufIndex  = -1;

  439.         chrBufIndex  = -1;

  440.         dstY         = 0;

  441.         lastInLumBuf = -1;

  442.         lastInChrBuf = -1;

  443.     }

  444. 

  445.     if (!should_dither) {

  446.         c->chrDither8 = c->lumDither8 = sws_pb_64;

  447.     }

  448.     lastDstY = dstY;

  449. 

  450.     for (; dstY < dstH; dstY++) {

  451.         const int chrDstY = dstY >> c->chrDstVSubSample;

  452.         uint8_t *dest[4]  = {

  453.             dst[0] + dstStride[0] * dstY,

  454.             dst[1] + dstStride[1] * chrDstY,

  455.             dst[2] + dstStride[2] * chrDstY,

  456.             (CONFIG_SWSCALE_ALPHA && alpPixBuf) ? dst[3] + dstStride[3] * dstY : NULL,

  457.         };

  458. 

  459.         // First line needed as input

  460.         const int firstLumSrcY  = FFMAX(1 - vLumFilterSize, vLumFilterPos[dstY]);

  461.         const int firstLumSrcY2 = FFMAX(1 - vLumFilterSize, vLumFilterPos[FFMIN(dstY | ((1 << c->chrDstVSubSample) - 1), dstH - 1)]);

  462.         // First line needed as input

  463.         const int firstChrSrcY  = FFMAX(1 - vChrFilterSize, vChrFilterPos[chrDstY]);

  464. 

  465.         // Last line needed as input

  466.         int lastLumSrcY  = FFMIN(c->srcH,    firstLumSrcY  + vLumFilterSize) - 1;

  467.         int lastLumSrcY2 = FFMIN(c->srcH,    firstLumSrcY2 + vLumFilterSize) - 1;

  468.         int lastChrSrcY  = FFMIN(c->chrSrcH, firstChrSrcY  + vChrFilterSize) - 1;

  469.         int enough_lines;

  470. 

  471.         // handle holes (FAST_BILINEAR & weird filters)

  472.         if (firstLumSrcY > lastInLumBuf)

  473.             lastInLumBuf = firstLumSrcY - 1;

  474.         if (firstChrSrcY > lastInChrBuf)

  475.             lastInChrBuf = firstChrSrcY - 1;

  476.         assert(firstLumSrcY >= lastInLumBuf - vLumBufSize + 1);

  477.         assert(firstChrSrcY >= lastInChrBuf - vChrBufSize + 1);

  478. 

  479.         DEBUG_BUFFERS("dstY: %d\n", dstY);

  480.         DEBUG_BUFFERS("\tfirstLumSrcY: %d lastLumSrcY: %d lastInLumBuf: %d\n",

  481.                       firstLumSrcY, lastLumSrcY, lastInLumBuf);

  482.         DEBUG_BUFFERS("\tfirstChrSrcY: %d lastChrSrcY: %d lastInChrBuf: %d\n",

  483.                       firstChrSrcY, lastChrSrcY, lastInChrBuf);

  484. 

  485.         // Do we have enough lines in this slice to output the dstY line

  486.         enough_lines = lastLumSrcY2 < srcSliceY + srcSliceH &&

  487.                        lastChrSrcY < AV_CEIL_RSHIFT(srcSliceY + srcSliceH, c->chrSrcVSubSample);

  488. 

  489.         if (!enough_lines) {

  490.             lastLumSrcY = srcSliceY + srcSliceH - 1;

  491.             lastChrSrcY = chrSrcSliceY + chrSrcSliceH - 1;

  492.             DEBUG_BUFFERS("buffering slice: lastLumSrcY %d lastChrSrcY %d\n",

  493.                           lastLumSrcY, lastChrSrcY);

  494.         }

  495. 

  496.         // Do horizontal scaling

  497.         while (lastInLumBuf < lastLumSrcY) {

  498.             const uint8_t *src1[4] = {

  499.                 src[0] + (lastInLumBuf + 1 - srcSliceY) * srcStride[0],

  500.                 src[1] + (lastInLumBuf + 1 - srcSliceY) * srcStride[1],

  501.                 src[2] + (lastInLumBuf + 1 - srcSliceY) * srcStride[2],

  502.                 src[3] + (lastInLumBuf + 1 - srcSliceY) * srcStride[3],

  503.             };

  504.             lumBufIndex++;

  505.             assert(lumBufIndex < 2 * vLumBufSize);

  506.             assert(lastInLumBuf + 1 - srcSliceY < srcSliceH);

  507.             assert(lastInLumBuf + 1 - srcSliceY >= 0);

  508.             hyscale(c, lumPixBuf[lumBufIndex], dstW, src1, srcW, lumXInc,

  509.                     hLumFilter, hLumFilterPos, hLumFilterSize,

  510.                     formatConvBuffer, pal, 0);

  511.             if (CONFIG_SWSCALE_ALPHA && alpPixBuf)

  512.                 hyscale(c, alpPixBuf[lumBufIndex], dstW, src1, srcW,

  513.                         lumXInc, hLumFilter, hLumFilterPos, hLumFilterSize,

  514.                         formatConvBuffer, pal, 1);

  515.             lastInLumBuf++;

  516.             DEBUG_BUFFERS("\t\tlumBufIndex %d: lastInLumBuf: %d\n",

  517.                           lumBufIndex, lastInLumBuf);

  518.         }

  519.         while (lastInChrBuf < lastChrSrcY) {

  520.             const uint8_t *src1[4] = {

  521.                 src[0] + (lastInChrBuf + 1 - chrSrcSliceY) * srcStride[0],

  522.                 src[1] + (lastInChrBuf + 1 - chrSrcSliceY) * srcStride[1],

  523.                 src[2] + (lastInChrBuf + 1 - chrSrcSliceY) * srcStride[2],

  524.                 src[3] + (lastInChrBuf + 1 - chrSrcSliceY) * srcStride[3],

  525.             };

  526.             chrBufIndex++;

  527.             assert(chrBufIndex < 2 * vChrBufSize);

  528.             assert(lastInChrBuf + 1 - chrSrcSliceY < (chrSrcSliceH));

  529.             assert(lastInChrBuf + 1 - chrSrcSliceY >= 0);

  530.             // FIXME replace parameters through context struct (some at least)

  531. 

  532.             if (c->needs_hcscale)

  533.                 hcscale(c, chrUPixBuf[chrBufIndex], chrVPixBuf[chrBufIndex],

  534.                         chrDstW, src1, chrSrcW, chrXInc,

  535.                         hChrFilter, hChrFilterPos, hChrFilterSize,

  536.                         formatConvBuffer, pal);

  537.             lastInChrBuf++;

  538.             DEBUG_BUFFERS("\t\tchrBufIndex %d: lastInChrBuf: %d\n",

  539.                           chrBufIndex, lastInChrBuf);

  540.         }

  541.         // wrap buf index around to stay inside the ring buffer

  542.         if (lumBufIndex >= vLumBufSize)

  543.             lumBufIndex -= vLumBufSize;

  544.         if (chrBufIndex >= vChrBufSize)

  545.             chrBufIndex -= vChrBufSize;

  546.         if (!enough_lines)

  547.             break;  // we can't output a dstY line so let's try with the next slice

  548. 

  549. #if HAVE_MMX_INLINE

  550.         updateMMXDitherTables(c, dstY, lumBufIndex, chrBufIndex,

  551.                               lastInLumBuf, lastInChrBuf);

  552. #endif

  553.         if (should_dither) {

  554.             c->chrDither8 = ff_dither_8x8_128[chrDstY & 7];

  555.             c->lumDither8 = ff_dither_8x8_128[dstY    & 7];

  556.         }

  557.         if (dstY >= dstH - 2) {

  558.             /* hmm looks like we can't use MMX here without overwriting

  559.              * this array's tail */

  560.             ff_sws_init_output_funcs(c, &yuv2plane1, &yuv2planeX, &yuv2nv12cX,

  561.                                      &yuv2packed1, &yuv2packed2, &yuv2packedX, &yuv2anyX);

  562.         }

  563. 

  564.         {

  565.             const int16_t **lumSrcPtr  = (const int16_t **)lumPixBuf  + lumBufIndex + firstLumSrcY - lastInLumBuf + vLumBufSize;

  566.             const int16_t **chrUSrcPtr = (const int16_t **)chrUPixBuf + chrBufIndex + firstChrSrcY - lastInChrBuf + vChrBufSize;

  567.             const int16_t **chrVSrcPtr = (const int16_t **)chrVPixBuf + chrBufIndex + firstChrSrcY - lastInChrBuf + vChrBufSize;

  568.             const int16_t **alpSrcPtr  = (CONFIG_SWSCALE_ALPHA && alpPixBuf) ?

  569.                                          (const int16_t **)alpPixBuf  + lumBufIndex + firstLumSrcY - lastInLumBuf + vLumBufSize : NULL;

  570. 

  571.             if (firstLumSrcY < 0 || firstLumSrcY + vLumFilterSize > c->srcH) {

  572.                 const int16_t **tmpY = (const int16_t **)lumPixBuf +

  573.                                        2 * vLumBufSize;

  574.                 int neg = -firstLumSrcY, i;

  575.                 int end = FFMIN(c->srcH - firstLumSrcY, vLumFilterSize);

  576.                 for (i = 0; i < neg; i++)

  577.                     tmpY[i] = lumSrcPtr[neg];

  578.                 for (; i < end; i++)

  579.                     tmpY[i] = lumSrcPtr[i];

  580.                 for (; i < vLumFilterSize; i++)

  581.                     tmpY[i] = tmpY[i - 1];

  582.                 lumSrcPtr = tmpY;

  583. 

  584.                 if (alpSrcPtr) {

  585.                     const int16_t **tmpA = (const int16_t **)alpPixBuf +

  586.                                            2 * vLumBufSize;

  587.                     for (i = 0; i < neg; i++)

  588.                         tmpA[i] = alpSrcPtr[neg];

  589.                     for (; i < end; i++)

  590.                         tmpA[i] = alpSrcPtr[i];

  591.                     for (; i < vLumFilterSize; i++)

  592.                         tmpA[i] = tmpA[i - 1];

  593.                     alpSrcPtr = tmpA;

  594.                 }

  595.             }

  596.             if (firstChrSrcY < 0 ||

  597.                 firstChrSrcY + vChrFilterSize > c->chrSrcH) {

  598.                 const int16_t **tmpU = (const int16_t **)chrUPixBuf + 2 * vChrBufSize,

  599.                 **tmpV               = (const int16_t **)chrVPixBuf + 2 * vChrBufSize;

  600.                 int neg = -firstChrSrcY, i;

  601.                 int end = FFMIN(c->chrSrcH - firstChrSrcY, vChrFilterSize);

  602.                 for (i = 0; i < neg; i++) {

  603.                     tmpU[i] = chrUSrcPtr[neg];

  604.                     tmpV[i] = chrVSrcPtr[neg];

  605.                 }

  606.                 for (; i < end; i++) {

  607.                     tmpU[i] = chrUSrcPtr[i];

  608.                     tmpV[i] = chrVSrcPtr[i];

  609.                 }

  610.                 for (; i < vChrFilterSize; i++) {

  611.                     tmpU[i] = tmpU[i - 1];

  612.                     tmpV[i] = tmpV[i - 1];

  613.                 }

  614.                 chrUSrcPtr = tmpU;

  615.                 chrVSrcPtr = tmpV;

  616.             }

  617. 

  618.             if (isPlanarYUV(dstFormat) ||

  619.                 (isGray(dstFormat) && !isALPHA(dstFormat))) { // YV12 like

  620.                 const int chrSkipMask = (1 << c->chrDstVSubSample) - 1;

  621. 

  622.                 if (vLumFilterSize == 1) {

  623.                     yuv2plane1(lumSrcPtr[0], dest[0], dstW, c->lumDither8, 0);

  624.                 } else {

  625.                     yuv2planeX(vLumFilter + dstY * vLumFilterSize,

  626.                                vLumFilterSize, lumSrcPtr, dest[0],

  627.                                dstW, c->lumDither8, 0);

  628.                 }

  629. 

  630.                 if (!((dstY & chrSkipMask) || isGray(dstFormat))) {

  631.                     if (yuv2nv12cX) {

  632.                         yuv2nv12cX(c, vChrFilter + chrDstY * vChrFilterSize,

  633.                                    vChrFilterSize, chrUSrcPtr, chrVSrcPtr,

  634.                                    dest[1], chrDstW);

  635.                     } else if (vChrFilterSize == 1) {

  636.                         yuv2plane1(chrUSrcPtr[0], dest[1], chrDstW, c->chrDither8, 0);

  637.                         yuv2plane1(chrVSrcPtr[0], dest[2], chrDstW, c->chrDither8, 3);

  638.                     } else {

  639.                         yuv2planeX(vChrFilter + chrDstY * vChrFilterSize,

  640.                                    vChrFilterSize, chrUSrcPtr, dest[1],

  641.                                    chrDstW, c->chrDither8, 0);

  642.                         yuv2planeX(vChrFilter + chrDstY * vChrFilterSize,

  643.                                    vChrFilterSize, chrVSrcPtr, dest[2],

  644.                                    chrDstW, c->chrDither8, 3);

  645.                     }

  646.                 }

  647. 

  648.                 if (CONFIG_SWSCALE_ALPHA && alpPixBuf) {

  649.                     if (vLumFilterSize == 1) {

  650.                         yuv2plane1(alpSrcPtr[0], dest[3], dstW,

  651.                                    c->lumDither8, 0);

  652.                     } else {

  653.                         yuv2planeX(vLumFilter + dstY * vLumFilterSize,

  654.                                    vLumFilterSize, alpSrcPtr, dest[3],

  655.                                    dstW, c->lumDither8, 0);

  656.                     }

  657.                 }

  658.             } else if (yuv2packedX) {

  659.                 if (c->yuv2packed1 && vLumFilterSize == 1 &&

  660.                     vChrFilterSize <= 2) { // unscaled RGB

  661.                     int chrAlpha = vChrFilterSize == 1 ? 0 : vChrFilter[2 * dstY + 1];

  662.                     yuv2packed1(c, *lumSrcPtr, chrUSrcPtr, chrVSrcPtr,

  663.                                 alpPixBuf ? *alpSrcPtr : NULL,

  664.                                 dest[0], dstW, chrAlpha, dstY);

  665.                 } else if (c->yuv2packed2 && vLumFilterSize == 2 &&

  666.                            vChrFilterSize == 2) { // bilinear upscale RGB

  667.                     int lumAlpha = vLumFilter[2 * dstY + 1];

  668.                     int chrAlpha = vChrFilter[2 * dstY + 1];

  669.                     lumMmxFilter[2] =

  670.                     lumMmxFilter[3] = vLumFilter[2 * dstY]    * 0x10001;

  671.                     chrMmxFilter[2] =

  672.                     chrMmxFilter[3] = vChrFilter[2 * chrDstY] * 0x10001;

  673.                     yuv2packed2(c, lumSrcPtr, chrUSrcPtr, chrVSrcPtr,

  674.                                 alpPixBuf ? alpSrcPtr : NULL,

  675.                                 dest[0], dstW, lumAlpha, chrAlpha, dstY);

  676.                 } else { // general RGB

  677.                     yuv2packedX(c, vLumFilter + dstY * vLumFilterSize,

  678.                                 lumSrcPtr, vLumFilterSize,

  679.                                 vChrFilter + dstY * vChrFilterSize,

  680.                                 chrUSrcPtr, chrVSrcPtr, vChrFilterSize,

  681.                                 alpSrcPtr, dest[0], dstW, dstY);

  682.                 }

  683.             } else {

  684.                 yuv2anyX(c, vLumFilter + dstY * vLumFilterSize,

  685.                          lumSrcPtr, vLumFilterSize,

  686.                          vChrFilter + dstY * vChrFilterSize,

  687.                          chrUSrcPtr, chrVSrcPtr, vChrFilterSize,

  688.                          alpSrcPtr, dest, dstW, dstY);

  689.             }

  690.         }

  691.     }

  692. 

  693.     if (isPlanar(dstFormat) && isALPHA(dstFormat) && !alpPixBuf) {

  694.         int length = dstW;

  695.         int height = dstY - lastDstY;

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

  697.             length *= 2;

  698. 

  699.         if (is9_15BPS(dstFormat)) {

  700.             const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(dstFormat);

  701.             fill_plane9or10(dst[3], dstStride[3], length, height, lastDstY,

  702.                             255, desc->comp[3].depth, isBE(dstFormat));

  703.         } else

  704.             fillPlane(dst[3], dstStride[3], length, height, lastDstY, 255);

  705.     }

  706. 

  707. #if HAVE_MMXEXT_INLINE

  708.     if (av_get_cpu_flags() & AV_CPU_FLAG_MMXEXT)

  709.         __asm__ volatile ("sfence" ::: "memory");

  710. #endif

  711.     emms_c();

  712. 

  713.     /* store changed local vars back in the context */

  714.     c->dstY         = dstY;

  715.     c->lumBufIndex  = lumBufIndex;

  716.     c->chrBufIndex  = chrBufIndex;

  717.     c->lastInLumBuf = lastInLumBuf;

  718.     c->lastInChrBuf = lastInChrBuf;

  719. 

  720.     return dstY - lastDstY;

  721. }

  722. 

  723. static av_cold void sws_init_swscale(SwsContext *c)

  724. {

  725.     enum AVPixelFormat srcFormat = c->srcFormat;

  726. 

  727.     ff_sws_init_output_funcs(c, &c->yuv2plane1, &c->yuv2planeX,

  728.                              &c->yuv2nv12cX, &c->yuv2packed1,

  729.                              &c->yuv2packed2, &c->yuv2packedX, &c->yuv2anyX);

  730. 

  731.     ff_sws_init_input_funcs(c);

  732. 

  733.     if (c->srcBpc == 8) {

  734.         if (c->dstBpc <= 15) {

  735.             c->hyScale = c->hcScale = hScale8To15_c;

  736.             if (c->flags & SWS_FAST_BILINEAR) {

  737.                 c->hyscale_fast = hyscale_fast_c;

  738.                 c->hcscale_fast = hcscale_fast_c;

  739.             }

  740.         } else {

  741.             c->hyScale = c->hcScale = hScale8To19_c;

  742.         }

  743.     } else {

  744.         c->hyScale = c->hcScale = c->dstBpc > 15 ? hScale16To19_c

  745.                                                  : hScale16To15_c;

  746.     }

  747. 

  748.     if (c->srcRange != c->dstRange && !isAnyRGB(c->dstFormat)) {

  749.         if (c->dstBpc <= 15) {

  750.             if (c->srcRange) {

  751.                 c->lumConvertRange = lumRangeFromJpeg_c;

  752.                 c->chrConvertRange = chrRangeFromJpeg_c;

  753.             } else {

  754.                 c->lumConvertRange = lumRangeToJpeg_c;

  755.                 c->chrConvertRange = chrRangeToJpeg_c;

  756.             }

  757.         } else {

  758.             if (c->srcRange) {

  759.                 c->lumConvertRange = lumRangeFromJpeg16_c;

  760.                 c->chrConvertRange = chrRangeFromJpeg16_c;

  761.             } else {

  762.                 c->lumConvertRange = lumRangeToJpeg16_c;

  763.                 c->chrConvertRange = chrRangeToJpeg16_c;

  764.             }

  765.         }

  766.     }

  767. 

  768.     if (!(isGray(srcFormat) || isGray(c->dstFormat) ||

  769.           srcFormat == AV_PIX_FMT_MONOBLACK || srcFormat == AV_PIX_FMT_MONOWHITE))

  770.         c->needs_hcscale = 1;

  771. }

  772. 

  773. SwsFunc ff_getSwsFunc(SwsContext *c)

  774. {

  775.     sws_init_swscale(c);

  776. 

  777.     if (ARCH_PPC)

  778.         ff_sws_init_swscale_ppc(c);

  779.     if (ARCH_X86)

  780.         ff_sws_init_swscale_x86(c);

  781. 

  782.     return swscale;

  783. }