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libswscale/swscale_unscaled.c

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00001 /*
00002  * Copyright (C) 2001-2003 Michael Niedermayer <michaelni@gmx.at>
00003  *
00004  * This file is part of Libav.
00005  *
00006  * Libav is free software; you can redistribute it and/or
00007  * modify it under the terms of the GNU Lesser General Public
00008  * License as published by the Free Software Foundation; either
00009  * version 2.1 of the License, or (at your option) any later version.
00010  *
00011  * Libav is distributed in the hope that it will be useful,
00012  * but WITHOUT ANY WARRANTY; without even the implied warranty of
00013  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00014  * Lesser General Public License for more details.
00015  *
00016  * You should have received a copy of the GNU Lesser General Public
00017  * License along with Libav; if not, write to the Free Software
00018  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
00019  */
00020 
00021 #include <inttypes.h>
00022 #include <string.h>
00023 #include <math.h>
00024 #include <stdio.h>
00025 #include "config.h"
00026 #include <assert.h>
00027 #include "swscale.h"
00028 #include "swscale_internal.h"
00029 #include "rgb2rgb.h"
00030 #include "libavutil/intreadwrite.h"
00031 #include "libavutil/cpu.h"
00032 #include "libavutil/avutil.h"
00033 #include "libavutil/mathematics.h"
00034 #include "libavutil/bswap.h"
00035 #include "libavutil/pixdesc.h"
00036 
00037 DECLARE_ALIGNED(8, const uint8_t, dither_8x8_1)[8][8] = {
00038     {   0,  1,  0,  1,  0,  1,  0,  1,},
00039     {   1,  0,  1,  0,  1,  0,  1,  0,},
00040     {   0,  1,  0,  1,  0,  1,  0,  1,},
00041     {   1,  0,  1,  0,  1,  0,  1,  0,},
00042     {   0,  1,  0,  1,  0,  1,  0,  1,},
00043     {   1,  0,  1,  0,  1,  0,  1,  0,},
00044     {   0,  1,  0,  1,  0,  1,  0,  1,},
00045     {   1,  0,  1,  0,  1,  0,  1,  0,},
00046 };
00047 DECLARE_ALIGNED(8, const uint8_t, dither_8x8_3)[8][8] = {
00048     {   1,  2,  1,  2,  1,  2,  1,  2,},
00049     {   3,  0,  3,  0,  3,  0,  3,  0,},
00050     {   1,  2,  1,  2,  1,  2,  1,  2,},
00051     {   3,  0,  3,  0,  3,  0,  3,  0,},
00052     {   1,  2,  1,  2,  1,  2,  1,  2,},
00053     {   3,  0,  3,  0,  3,  0,  3,  0,},
00054     {   1,  2,  1,  2,  1,  2,  1,  2,},
00055     {   3,  0,  3,  0,  3,  0,  3,  0,},
00056 };
00057 DECLARE_ALIGNED(8, const uint8_t, dither_8x8_64)[8][8] = {
00058     {  18, 34, 30, 46, 17, 33, 29, 45,},
00059     {  50,  2, 62, 14, 49,  1, 61, 13,},
00060     {  26, 42, 22, 38, 25, 41, 21, 37,},
00061     {  58, 10, 54,  6, 57,  9, 53,  5,},
00062     {  16, 32, 28, 44, 19, 35, 31, 47,},
00063     {  48,  0, 60, 12, 51,  3, 63, 15,},
00064     {  24, 40, 20, 36, 27, 43, 23, 39,},
00065     {  56,  8, 52,  4, 59, 11, 55,  7,},
00066 };
00067 extern const uint8_t dither_8x8_128[8][8];
00068 DECLARE_ALIGNED(8, const uint8_t, dither_8x8_256)[8][8] = {
00069     {  72, 136, 120, 184,  68, 132, 116, 180,},
00070     { 200,   8, 248,  56, 196,   4, 244,  52,},
00071     { 104, 168,  88, 152, 100, 164,  84, 148,},
00072     { 232,  40, 216,  24, 228,  36, 212,  20,},
00073     {  64, 128, 102, 176,  76, 140, 124, 188,},
00074     { 192,   0, 240,  48, 204,  12, 252,  60,},
00075     {  96, 160,  80, 144, 108, 172,  92, 156,},
00076     { 224,  32, 208,  16, 236,  44, 220,  28,},
00077 };
00078 
00079 #define RGB2YUV_SHIFT 15
00080 #define BY ( (int) (0.114 * 219 / 255 * (1 << RGB2YUV_SHIFT) + 0.5))
00081 #define BV (-(int) (0.081 * 224 / 255 * (1 << RGB2YUV_SHIFT) + 0.5))
00082 #define BU ( (int) (0.500 * 224 / 255 * (1 << RGB2YUV_SHIFT) + 0.5))
00083 #define GY ( (int) (0.587 * 219 / 255 * (1 << RGB2YUV_SHIFT) + 0.5))
00084 #define GV (-(int) (0.419 * 224 / 255 * (1 << RGB2YUV_SHIFT) + 0.5))
00085 #define GU (-(int) (0.331 * 224 / 255 * (1 << RGB2YUV_SHIFT) + 0.5))
00086 #define RY ( (int) (0.299 * 219 / 255 * (1 << RGB2YUV_SHIFT) + 0.5))
00087 #define RV ( (int) (0.500 * 224 / 255 * (1 << RGB2YUV_SHIFT) + 0.5))
00088 #define RU (-(int) (0.169 * 224 / 255 * (1 << RGB2YUV_SHIFT) + 0.5))
00089 
00090 static void fillPlane(uint8_t *plane, int stride, int width, int height, int y,
00091                       uint8_t val)
00092 {
00093     int i;
00094     uint8_t *ptr = plane + stride * y;
00095     for (i = 0; i < height; i++) {
00096         memset(ptr, val, width);
00097         ptr += stride;
00098     }
00099 }
00100 
00101 static void copyPlane(const uint8_t *src, int srcStride,
00102                       int srcSliceY, int srcSliceH, int width,
00103                       uint8_t *dst, int dstStride)
00104 {
00105     dst += dstStride * srcSliceY;
00106     if (dstStride == srcStride && srcStride > 0) {
00107         memcpy(dst, src, srcSliceH * dstStride);
00108     } else {
00109         int i;
00110         for (i = 0; i < srcSliceH; i++) {
00111             memcpy(dst, src, width);
00112             src += srcStride;
00113             dst += dstStride;
00114         }
00115     }
00116 }
00117 
00118 static int planarToNv12Wrapper(SwsContext *c, const uint8_t *src[],
00119                                int srcStride[], int srcSliceY,
00120                                int srcSliceH, uint8_t *dstParam[],
00121                                int dstStride[])
00122 {
00123     uint8_t *dst = dstParam[1] + dstStride[1] * srcSliceY / 2;
00124 
00125     copyPlane(src[0], srcStride[0], srcSliceY, srcSliceH, c->srcW,
00126               dstParam[0], dstStride[0]);
00127 
00128     if (c->dstFormat == PIX_FMT_NV12)
00129         interleaveBytes(src[1], src[2], dst, c->srcW / 2, srcSliceH / 2,
00130                         srcStride[1], srcStride[2], dstStride[0]);
00131     else
00132         interleaveBytes(src[2], src[1], dst, c->srcW / 2, srcSliceH / 2,
00133                         srcStride[2], srcStride[1], dstStride[0]);
00134 
00135     return srcSliceH;
00136 }
00137 
00138 static int planarToYuy2Wrapper(SwsContext *c, const uint8_t *src[],
00139                                int srcStride[], int srcSliceY, int srcSliceH,
00140                                uint8_t *dstParam[], int dstStride[])
00141 {
00142     uint8_t *dst = dstParam[0] + dstStride[0] * srcSliceY;
00143 
00144     yv12toyuy2(src[0], src[1], src[2], dst, c->srcW, srcSliceH, srcStride[0],
00145                srcStride[1], dstStride[0]);
00146 
00147     return srcSliceH;
00148 }
00149 
00150 static int planarToUyvyWrapper(SwsContext *c, const uint8_t *src[],
00151                                int srcStride[], int srcSliceY, int srcSliceH,
00152                                uint8_t *dstParam[], int dstStride[])
00153 {
00154     uint8_t *dst = dstParam[0] + dstStride[0] * srcSliceY;
00155 
00156     yv12touyvy(src[0], src[1], src[2], dst, c->srcW, srcSliceH, srcStride[0],
00157                srcStride[1], dstStride[0]);
00158 
00159     return srcSliceH;
00160 }
00161 
00162 static int yuv422pToYuy2Wrapper(SwsContext *c, const uint8_t *src[],
00163                                 int srcStride[], int srcSliceY, int srcSliceH,
00164                                 uint8_t *dstParam[], int dstStride[])
00165 {
00166     uint8_t *dst = dstParam[0] + dstStride[0] * srcSliceY;
00167 
00168     yuv422ptoyuy2(src[0], src[1], src[2], dst, c->srcW, srcSliceH, srcStride[0],
00169                   srcStride[1], dstStride[0]);
00170 
00171     return srcSliceH;
00172 }
00173 
00174 static int yuv422pToUyvyWrapper(SwsContext *c, const uint8_t *src[],
00175                                 int srcStride[], int srcSliceY, int srcSliceH,
00176                                 uint8_t *dstParam[], int dstStride[])
00177 {
00178     uint8_t *dst = dstParam[0] + dstStride[0] * srcSliceY;
00179 
00180     yuv422ptouyvy(src[0], src[1], src[2], dst, c->srcW, srcSliceH, srcStride[0],
00181                   srcStride[1], dstStride[0]);
00182 
00183     return srcSliceH;
00184 }
00185 
00186 static int yuyvToYuv420Wrapper(SwsContext *c, const uint8_t *src[],
00187                                int srcStride[], int srcSliceY, int srcSliceH,
00188                                uint8_t *dstParam[], int dstStride[])
00189 {
00190     uint8_t *ydst = dstParam[0] + dstStride[0] * srcSliceY;
00191     uint8_t *udst = dstParam[1] + dstStride[1] * srcSliceY / 2;
00192     uint8_t *vdst = dstParam[2] + dstStride[2] * srcSliceY / 2;
00193 
00194     yuyvtoyuv420(ydst, udst, vdst, src[0], c->srcW, srcSliceH, dstStride[0],
00195                  dstStride[1], srcStride[0]);
00196 
00197     if (dstParam[3])
00198         fillPlane(dstParam[3], dstStride[3], c->srcW, srcSliceH, srcSliceY, 255);
00199 
00200     return srcSliceH;
00201 }
00202 
00203 static int yuyvToYuv422Wrapper(SwsContext *c, const uint8_t *src[],
00204                                int srcStride[], int srcSliceY, int srcSliceH,
00205                                uint8_t *dstParam[], int dstStride[])
00206 {
00207     uint8_t *ydst = dstParam[0] + dstStride[0] * srcSliceY;
00208     uint8_t *udst = dstParam[1] + dstStride[1] * srcSliceY;
00209     uint8_t *vdst = dstParam[2] + dstStride[2] * srcSliceY;
00210 
00211     yuyvtoyuv422(ydst, udst, vdst, src[0], c->srcW, srcSliceH, dstStride[0],
00212                  dstStride[1], srcStride[0]);
00213 
00214     return srcSliceH;
00215 }
00216 
00217 static int uyvyToYuv420Wrapper(SwsContext *c, const uint8_t *src[],
00218                                int srcStride[], int srcSliceY, int srcSliceH,
00219                                uint8_t *dstParam[], int dstStride[])
00220 {
00221     uint8_t *ydst = dstParam[0] + dstStride[0] * srcSliceY;
00222     uint8_t *udst = dstParam[1] + dstStride[1] * srcSliceY / 2;
00223     uint8_t *vdst = dstParam[2] + dstStride[2] * srcSliceY / 2;
00224 
00225     uyvytoyuv420(ydst, udst, vdst, src[0], c->srcW, srcSliceH, dstStride[0],
00226                  dstStride[1], srcStride[0]);
00227 
00228     if (dstParam[3])
00229         fillPlane(dstParam[3], dstStride[3], c->srcW, srcSliceH, srcSliceY, 255);
00230 
00231     return srcSliceH;
00232 }
00233 
00234 static int uyvyToYuv422Wrapper(SwsContext *c, const uint8_t *src[],
00235                                int srcStride[], int srcSliceY, int srcSliceH,
00236                                uint8_t *dstParam[], int dstStride[])
00237 {
00238     uint8_t *ydst = dstParam[0] + dstStride[0] * srcSliceY;
00239     uint8_t *udst = dstParam[1] + dstStride[1] * srcSliceY;
00240     uint8_t *vdst = dstParam[2] + dstStride[2] * srcSliceY;
00241 
00242     uyvytoyuv422(ydst, udst, vdst, src[0], c->srcW, srcSliceH, dstStride[0],
00243                  dstStride[1], srcStride[0]);
00244 
00245     return srcSliceH;
00246 }
00247 
00248 static void gray8aToPacked32(const uint8_t *src, uint8_t *dst, int num_pixels,
00249                              const uint8_t *palette)
00250 {
00251     int i;
00252     for (i = 0; i < num_pixels; i++)
00253         ((uint32_t *) dst)[i] = ((const uint32_t *) palette)[src[i << 1]] | (src[(i << 1) + 1] << 24);
00254 }
00255 
00256 static void gray8aToPacked32_1(const uint8_t *src, uint8_t *dst, int num_pixels,
00257                                const uint8_t *palette)
00258 {
00259     int i;
00260 
00261     for (i = 0; i < num_pixels; i++)
00262         ((uint32_t *) dst)[i] = ((const uint32_t *) palette)[src[i << 1]] | src[(i << 1) + 1];
00263 }
00264 
00265 static void gray8aToPacked24(const uint8_t *src, uint8_t *dst, int num_pixels,
00266                              const uint8_t *palette)
00267 {
00268     int i;
00269 
00270     for (i = 0; i < num_pixels; i++) {
00271         //FIXME slow?
00272         dst[0] = palette[src[i << 1] * 4 + 0];
00273         dst[1] = palette[src[i << 1] * 4 + 1];
00274         dst[2] = palette[src[i << 1] * 4 + 2];
00275         dst += 3;
00276     }
00277 }
00278 
00279 static int packed_16bpc_bswap(SwsContext *c, const uint8_t *src[],
00280                               int srcStride[], int srcSliceY, int srcSliceH,
00281                               uint8_t *dst[], int dstStride[])
00282 {
00283     int i, j;
00284     int srcstr = srcStride[0] >> 1;
00285     int dststr = dstStride[0] >> 1;
00286     uint16_t       *dstPtr =       (uint16_t *) dst[0];
00287     const uint16_t *srcPtr = (const uint16_t *) src[0];
00288     int min_stride         = FFMIN(srcstr, dststr);
00289 
00290     for (i = 0; i < srcSliceH; i++) {
00291         for (j = 0; j < min_stride; j++) {
00292             dstPtr[j] = av_bswap16(srcPtr[j]);
00293         }
00294         srcPtr += srcstr;
00295         dstPtr += dststr;
00296     }
00297 
00298     return srcSliceH;
00299 }
00300 
00301 static int palToRgbWrapper(SwsContext *c, const uint8_t *src[], int srcStride[],
00302                            int srcSliceY, int srcSliceH, uint8_t *dst[],
00303                            int dstStride[])
00304 {
00305     const enum PixelFormat srcFormat = c->srcFormat;
00306     const enum PixelFormat dstFormat = c->dstFormat;
00307     void (*conv)(const uint8_t *src, uint8_t *dst, int num_pixels,
00308                  const uint8_t *palette) = NULL;
00309     int i;
00310     uint8_t *dstPtr = dst[0] + dstStride[0] * srcSliceY;
00311     const uint8_t *srcPtr = src[0];
00312 
00313     if (srcFormat == PIX_FMT_Y400A) {
00314         switch (dstFormat) {
00315         case PIX_FMT_RGB32  : conv = gray8aToPacked32; break;
00316         case PIX_FMT_BGR32  : conv = gray8aToPacked32; break;
00317         case PIX_FMT_BGR32_1: conv = gray8aToPacked32_1; break;
00318         case PIX_FMT_RGB32_1: conv = gray8aToPacked32_1; break;
00319         case PIX_FMT_RGB24  : conv = gray8aToPacked24; break;
00320         case PIX_FMT_BGR24  : conv = gray8aToPacked24; break;
00321         }
00322     } else if (usePal(srcFormat)) {
00323         switch (dstFormat) {
00324         case PIX_FMT_RGB32  : conv = sws_convertPalette8ToPacked32; break;
00325         case PIX_FMT_BGR32  : conv = sws_convertPalette8ToPacked32; break;
00326         case PIX_FMT_BGR32_1: conv = sws_convertPalette8ToPacked32; break;
00327         case PIX_FMT_RGB32_1: conv = sws_convertPalette8ToPacked32; break;
00328         case PIX_FMT_RGB24  : conv = sws_convertPalette8ToPacked24; break;
00329         case PIX_FMT_BGR24  : conv = sws_convertPalette8ToPacked24; break;
00330         }
00331     }
00332 
00333     if (!conv)
00334         av_log(c, AV_LOG_ERROR, "internal error %s -> %s converter\n",
00335                sws_format_name(srcFormat), sws_format_name(dstFormat));
00336     else {
00337         for (i = 0; i < srcSliceH; i++) {
00338             conv(srcPtr, dstPtr, c->srcW, (uint8_t *) c->pal_rgb);
00339             srcPtr += srcStride[0];
00340             dstPtr += dstStride[0];
00341         }
00342     }
00343 
00344     return srcSliceH;
00345 }
00346 
00347 #define isRGBA32(x) (            \
00348            (x) == PIX_FMT_ARGB   \
00349         || (x) == PIX_FMT_RGBA   \
00350         || (x) == PIX_FMT_BGRA   \
00351         || (x) == PIX_FMT_ABGR   \
00352         )
00353 
00354 /* {RGB,BGR}{15,16,24,32,32_1} -> {RGB,BGR}{15,16,24,32} */
00355 typedef void (* rgbConvFn) (const uint8_t *, uint8_t *, int);
00356 static rgbConvFn findRgbConvFn(SwsContext *c)
00357 {
00358     const enum PixelFormat srcFormat = c->srcFormat;
00359     const enum PixelFormat dstFormat = c->dstFormat;
00360     const int srcId = c->srcFormatBpp;
00361     const int dstId = c->dstFormatBpp;
00362     rgbConvFn conv = NULL;
00363 
00364 #define IS_NOT_NE(bpp, fmt) \
00365     (((bpp + 7) >> 3) == 2 && \
00366      (!(av_pix_fmt_descriptors[fmt].flags & PIX_FMT_BE) != !HAVE_BIGENDIAN))
00367 
00368     /* if this is non-native rgb444/555/565, don't handle it here. */
00369     if (IS_NOT_NE(srcId, srcFormat) || IS_NOT_NE(dstId, dstFormat))
00370         return NULL;
00371 
00372 #define CONV_IS(src, dst) (srcFormat == PIX_FMT_##src && dstFormat == PIX_FMT_##dst)
00373 
00374     if (isRGBA32(srcFormat) && isRGBA32(dstFormat)) {
00375         if (     CONV_IS(ABGR, RGBA)
00376               || CONV_IS(ARGB, BGRA)
00377               || CONV_IS(BGRA, ARGB)
00378               || CONV_IS(RGBA, ABGR)) conv = shuffle_bytes_3210;
00379         else if (CONV_IS(ABGR, ARGB)
00380               || CONV_IS(ARGB, ABGR)) conv = shuffle_bytes_0321;
00381         else if (CONV_IS(ABGR, BGRA)
00382               || CONV_IS(ARGB, RGBA)) conv = shuffle_bytes_1230;
00383         else if (CONV_IS(BGRA, RGBA)
00384               || CONV_IS(RGBA, BGRA)) conv = shuffle_bytes_2103;
00385         else if (CONV_IS(BGRA, ABGR)
00386               || CONV_IS(RGBA, ARGB)) conv = shuffle_bytes_3012;
00387     } else
00388     /* BGR -> BGR */
00389     if ((isBGRinInt(srcFormat) && isBGRinInt(dstFormat)) ||
00390         (isRGBinInt(srcFormat) && isRGBinInt(dstFormat))) {
00391         switch (srcId | (dstId << 16)) {
00392         case 0x000F000C: conv = rgb12to15; break;
00393         case 0x000F0010: conv = rgb16to15; break;
00394         case 0x000F0018: conv = rgb24to15; break;
00395         case 0x000F0020: conv = rgb32to15; break;
00396         case 0x0010000F: conv = rgb15to16; break;
00397         case 0x00100018: conv = rgb24to16; break;
00398         case 0x00100020: conv = rgb32to16; break;
00399         case 0x0018000F: conv = rgb15to24; break;
00400         case 0x00180010: conv = rgb16to24; break;
00401         case 0x00180020: conv = rgb32to24; break;
00402         case 0x0020000F: conv = rgb15to32; break;
00403         case 0x00200010: conv = rgb16to32; break;
00404         case 0x00200018: conv = rgb24to32; break;
00405         }
00406     } else if ((isBGRinInt(srcFormat) && isRGBinInt(dstFormat)) ||
00407                (isRGBinInt(srcFormat) && isBGRinInt(dstFormat))) {
00408         switch (srcId | (dstId << 16)) {
00409         case 0x000C000C: conv = rgb12tobgr12; break;
00410         case 0x000F000F: conv = rgb15tobgr15; break;
00411         case 0x000F0010: conv = rgb16tobgr15; break;
00412         case 0x000F0018: conv = rgb24tobgr15; break;
00413         case 0x000F0020: conv = rgb32tobgr15; break;
00414         case 0x0010000F: conv = rgb15tobgr16; break;
00415         case 0x00100010: conv = rgb16tobgr16; break;
00416         case 0x00100018: conv = rgb24tobgr16; break;
00417         case 0x00100020: conv = rgb32tobgr16; break;
00418         case 0x0018000F: conv = rgb15tobgr24; break;
00419         case 0x00180010: conv = rgb16tobgr24; break;
00420         case 0x00180018: conv = rgb24tobgr24; break;
00421         case 0x00180020: conv = rgb32tobgr24; break;
00422         case 0x0020000F: conv = rgb15tobgr32; break;
00423         case 0x00200010: conv = rgb16tobgr32; break;
00424         case 0x00200018: conv = rgb24tobgr32; break;
00425         }
00426     }
00427 
00428     return conv;
00429 }
00430 
00431 /* {RGB,BGR}{15,16,24,32,32_1} -> {RGB,BGR}{15,16,24,32} */
00432 static int rgbToRgbWrapper(SwsContext *c, const uint8_t *src[], int srcStride[],
00433                            int srcSliceY, int srcSliceH, uint8_t *dst[],
00434                            int dstStride[])
00435 
00436 {
00437     const enum PixelFormat srcFormat = c->srcFormat;
00438     const enum PixelFormat dstFormat = c->dstFormat;
00439     const int srcBpp = (c->srcFormatBpp + 7) >> 3;
00440     const int dstBpp = (c->dstFormatBpp + 7) >> 3;
00441     rgbConvFn conv = findRgbConvFn(c);
00442 
00443     if (!conv) {
00444         av_log(c, AV_LOG_ERROR, "internal error %s -> %s converter\n",
00445                sws_format_name(srcFormat), sws_format_name(dstFormat));
00446     } else {
00447         const uint8_t *srcPtr = src[0];
00448               uint8_t *dstPtr = dst[0];
00449         if ((srcFormat == PIX_FMT_RGB32_1 || srcFormat == PIX_FMT_BGR32_1) &&
00450             !isRGBA32(dstFormat))
00451             srcPtr += ALT32_CORR;
00452 
00453         if ((dstFormat == PIX_FMT_RGB32_1 || dstFormat == PIX_FMT_BGR32_1) &&
00454             !isRGBA32(srcFormat))
00455             dstPtr += ALT32_CORR;
00456 
00457         if (dstStride[0] * srcBpp == srcStride[0] * dstBpp && srcStride[0] > 0 &&
00458             !(srcStride[0] % srcBpp))
00459             conv(srcPtr, dstPtr + dstStride[0] * srcSliceY,
00460                  srcSliceH * srcStride[0]);
00461         else {
00462             int i;
00463             dstPtr += dstStride[0] * srcSliceY;
00464 
00465             for (i = 0; i < srcSliceH; i++) {
00466                 conv(srcPtr, dstPtr, c->srcW * srcBpp);
00467                 srcPtr += srcStride[0];
00468                 dstPtr += dstStride[0];
00469             }
00470         }
00471     }
00472     return srcSliceH;
00473 }
00474 
00475 static int bgr24ToYv12Wrapper(SwsContext *c, const uint8_t *src[],
00476                               int srcStride[], int srcSliceY, int srcSliceH,
00477                               uint8_t *dst[], int dstStride[])
00478 {
00479     rgb24toyv12(
00480         src[0],
00481         dst[0] +  srcSliceY       * dstStride[0],
00482         dst[1] + (srcSliceY >> 1) * dstStride[1],
00483         dst[2] + (srcSliceY >> 1) * dstStride[2],
00484         c->srcW, srcSliceH,
00485         dstStride[0], dstStride[1], srcStride[0]);
00486     if (dst[3])
00487         fillPlane(dst[3], dstStride[3], c->srcW, srcSliceH, srcSliceY, 255);
00488     return srcSliceH;
00489 }
00490 
00491 static int yvu9ToYv12Wrapper(SwsContext *c, const uint8_t *src[],
00492                              int srcStride[], int srcSliceY, int srcSliceH,
00493                              uint8_t *dst[], int dstStride[])
00494 {
00495     copyPlane(src[0], srcStride[0], srcSliceY, srcSliceH, c->srcW,
00496               dst[0], dstStride[0]);
00497 
00498     planar2x(src[1], dst[1] + dstStride[1] * (srcSliceY >> 1), c->chrSrcW,
00499              srcSliceH >> 2, srcStride[1], dstStride[1]);
00500     planar2x(src[2], dst[2] + dstStride[2] * (srcSliceY >> 1), c->chrSrcW,
00501              srcSliceH >> 2, srcStride[2], dstStride[2]);
00502     if (dst[3])
00503         fillPlane(dst[3], dstStride[3], c->srcW, srcSliceH, srcSliceY, 255);
00504     return srcSliceH;
00505 }
00506 
00507 /* unscaled copy like stuff (assumes nearly identical formats) */
00508 static int packedCopyWrapper(SwsContext *c, const uint8_t *src[],
00509                              int srcStride[], int srcSliceY, int srcSliceH,
00510                              uint8_t *dst[], int dstStride[])
00511 {
00512     if (dstStride[0] == srcStride[0] && srcStride[0] > 0)
00513         memcpy(dst[0] + dstStride[0] * srcSliceY, src[0], srcSliceH * dstStride[0]);
00514     else {
00515         int i;
00516         const uint8_t *srcPtr = src[0];
00517         uint8_t *dstPtr = dst[0] + dstStride[0] * srcSliceY;
00518         int length = 0;
00519 
00520         /* universal length finder */
00521         while (length + c->srcW <= FFABS(dstStride[0]) &&
00522                length + c->srcW <= FFABS(srcStride[0]))
00523             length += c->srcW;
00524         assert(length != 0);
00525 
00526         for (i = 0; i < srcSliceH; i++) {
00527             memcpy(dstPtr, srcPtr, length);
00528             srcPtr += srcStride[0];
00529             dstPtr += dstStride[0];
00530         }
00531     }
00532     return srcSliceH;
00533 }
00534 
00535 #define clip9(x)  av_clip_uintp2(x,  9)
00536 #define clip10(x) av_clip_uintp2(x, 10)
00537 #define DITHER_COPY(dst, dstStride, wfunc, src, srcStride, rfunc, dithers, shift, clip) \
00538     for (i = 0; i < height; i++) { \
00539         const uint8_t *dither = dithers[i & 7]; \
00540         for (j = 0; j < length - 7; j += 8) { \
00541             wfunc(&dst[j + 0], clip((rfunc(&src[j + 0]) + dither[0]) >> shift)); \
00542             wfunc(&dst[j + 1], clip((rfunc(&src[j + 1]) + dither[1]) >> shift)); \
00543             wfunc(&dst[j + 2], clip((rfunc(&src[j + 2]) + dither[2]) >> shift)); \
00544             wfunc(&dst[j + 3], clip((rfunc(&src[j + 3]) + dither[3]) >> shift)); \
00545             wfunc(&dst[j + 4], clip((rfunc(&src[j + 4]) + dither[4]) >> shift)); \
00546             wfunc(&dst[j + 5], clip((rfunc(&src[j + 5]) + dither[5]) >> shift)); \
00547             wfunc(&dst[j + 6], clip((rfunc(&src[j + 6]) + dither[6]) >> shift)); \
00548             wfunc(&dst[j + 7], clip((rfunc(&src[j + 7]) + dither[7]) >> shift)); \
00549         } \
00550         for (; j < length; j++) \
00551             wfunc(&dst[j],     (rfunc(&src[j]) + dither[j & 7]) >> shift); \
00552         dst += dstStride; \
00553         src += srcStride; \
00554     }
00555 
00556 static int planarCopyWrapper(SwsContext *c, const uint8_t *src[],
00557                              int srcStride[], int srcSliceY, int srcSliceH,
00558                              uint8_t *dst[], int dstStride[])
00559 {
00560     int plane, i, j;
00561     for (plane = 0; plane < 4; plane++) {
00562         int length = (plane == 0 || plane == 3) ? c->srcW  : -((-c->srcW  ) >> c->chrDstHSubSample);
00563         int y =      (plane == 0 || plane == 3) ? srcSliceY: -((-srcSliceY) >> c->chrDstVSubSample);
00564         int height = (plane == 0 || plane == 3) ? srcSliceH: -((-srcSliceH) >> c->chrDstVSubSample);
00565         const uint8_t *srcPtr = src[plane];
00566         uint8_t *dstPtr = dst[plane] + dstStride[plane] * y;
00567 
00568         if (!dst[plane])
00569             continue;
00570         // ignore palette for GRAY8
00571         if (plane == 1 && !dst[2]) continue;
00572         if (!src[plane] || (plane == 1 && !src[2])) {
00573             if (is16BPS(c->dstFormat))
00574                 length *= 2;
00575             fillPlane(dst[plane], dstStride[plane], length, height, y,
00576                       (plane == 3) ? 255 : 128);
00577         } else {
00578             if (is9_OR_10BPS(c->srcFormat)) {
00579                 const int src_depth = av_pix_fmt_descriptors[c->srcFormat].comp[plane].depth_minus1 + 1;
00580                 const int dst_depth = av_pix_fmt_descriptors[c->dstFormat].comp[plane].depth_minus1 + 1;
00581                 const uint16_t *srcPtr2 = (const uint16_t *) srcPtr;
00582 
00583                 if (is16BPS(c->dstFormat)) {
00584                     uint16_t *dstPtr2 = (uint16_t *) dstPtr;
00585 #define COPY9_OR_10TO16(rfunc, wfunc) \
00586                     for (i = 0; i < height; i++) { \
00587                         for (j = 0; j < length; j++) { \
00588                             int srcpx = rfunc(&srcPtr2[j]); \
00589                             wfunc(&dstPtr2[j], (srcpx << (16 - src_depth)) | (srcpx >> (2 * src_depth - 16))); \
00590                         } \
00591                         dstPtr2 += dstStride[plane] / 2; \
00592                         srcPtr2 += srcStride[plane] / 2; \
00593                     }
00594                     if (isBE(c->dstFormat)) {
00595                         if (isBE(c->srcFormat)) {
00596                             COPY9_OR_10TO16(AV_RB16, AV_WB16);
00597                         } else {
00598                             COPY9_OR_10TO16(AV_RL16, AV_WB16);
00599                         }
00600                     } else {
00601                         if (isBE(c->srcFormat)) {
00602                             COPY9_OR_10TO16(AV_RB16, AV_WL16);
00603                         } else {
00604                             COPY9_OR_10TO16(AV_RL16, AV_WL16);
00605                         }
00606                     }
00607                 } else if (is9_OR_10BPS(c->dstFormat)) {
00608                     uint16_t *dstPtr2 = (uint16_t *) dstPtr;
00609 #define COPY9_OR_10TO9_OR_10(loop) \
00610                     for (i = 0; i < height; i++) { \
00611                         for (j = 0; j < length; j++) { \
00612                             loop; \
00613                         } \
00614                         dstPtr2 += dstStride[plane] / 2; \
00615                         srcPtr2 += srcStride[plane] / 2; \
00616                     }
00617 #define COPY9_OR_10TO9_OR_10_2(rfunc, wfunc) \
00618                     if (dst_depth > src_depth) { \
00619                         COPY9_OR_10TO9_OR_10(int srcpx = rfunc(&srcPtr2[j]); \
00620                             wfunc(&dstPtr2[j], (srcpx << 1) | (srcpx >> 9))); \
00621                     } else if (dst_depth < src_depth) { \
00622                         DITHER_COPY(dstPtr2, dstStride[plane] / 2, wfunc, \
00623                                     srcPtr2, srcStride[plane] / 2, rfunc, \
00624                                     dither_8x8_1, 1, clip9); \
00625                     } else { \
00626                         COPY9_OR_10TO9_OR_10(wfunc(&dstPtr2[j], rfunc(&srcPtr2[j]))); \
00627                     }
00628                     if (isBE(c->dstFormat)) {
00629                         if (isBE(c->srcFormat)) {
00630                             COPY9_OR_10TO9_OR_10_2(AV_RB16, AV_WB16);
00631                         } else {
00632                             COPY9_OR_10TO9_OR_10_2(AV_RL16, AV_WB16);
00633                         }
00634                     } else {
00635                         if (isBE(c->srcFormat)) {
00636                             COPY9_OR_10TO9_OR_10_2(AV_RB16, AV_WL16);
00637                         } else {
00638                             COPY9_OR_10TO9_OR_10_2(AV_RL16, AV_WL16);
00639                         }
00640                     }
00641                 } else {
00642 #define W8(a, b) { *(a) = (b); }
00643 #define COPY9_OR_10TO8(rfunc) \
00644                     if (src_depth == 9) { \
00645                         DITHER_COPY(dstPtr,  dstStride[plane],   W8, \
00646                                     srcPtr2, srcStride[plane] / 2, rfunc, \
00647                                     dither_8x8_1, 1, av_clip_uint8); \
00648                     } else { \
00649                         DITHER_COPY(dstPtr,  dstStride[plane],   W8, \
00650                                     srcPtr2, srcStride[plane] / 2, rfunc, \
00651                                     dither_8x8_3, 2, av_clip_uint8); \
00652                     }
00653                     if (isBE(c->srcFormat)) {
00654                         COPY9_OR_10TO8(AV_RB16);
00655                     } else {
00656                         COPY9_OR_10TO8(AV_RL16);
00657                     }
00658                 }
00659             } else if (is9_OR_10BPS(c->dstFormat)) {
00660                 const int dst_depth = av_pix_fmt_descriptors[c->dstFormat].comp[plane].depth_minus1 + 1;
00661                 uint16_t *dstPtr2 = (uint16_t *) dstPtr;
00662 
00663                 if (is16BPS(c->srcFormat)) {
00664                     const uint16_t *srcPtr2 = (const uint16_t *) srcPtr;
00665 #define COPY16TO9_OR_10(rfunc, wfunc) \
00666                     if (dst_depth == 9) { \
00667                         DITHER_COPY(dstPtr2, dstStride[plane] / 2, wfunc, \
00668                                     srcPtr2, srcStride[plane] / 2, rfunc, \
00669                                     dither_8x8_128, 7, clip9); \
00670                     } else { \
00671                         DITHER_COPY(dstPtr2, dstStride[plane] / 2, wfunc, \
00672                                     srcPtr2, srcStride[plane] / 2, rfunc, \
00673                                     dither_8x8_64, 6, clip10); \
00674                     }
00675                     if (isBE(c->dstFormat)) {
00676                         if (isBE(c->srcFormat)) {
00677                             COPY16TO9_OR_10(AV_RB16, AV_WB16);
00678                         } else {
00679                             COPY16TO9_OR_10(AV_RL16, AV_WB16);
00680                         }
00681                     } else {
00682                         if (isBE(c->srcFormat)) {
00683                             COPY16TO9_OR_10(AV_RB16, AV_WL16);
00684                         } else {
00685                             COPY16TO9_OR_10(AV_RL16, AV_WL16);
00686                         }
00687                     }
00688                 } else /* 8bit */ {
00689 #define COPY8TO9_OR_10(wfunc) \
00690                     for (i = 0; i < height; i++) { \
00691                         for (j = 0; j < length; j++) { \
00692                             const int srcpx = srcPtr[j]; \
00693                             wfunc(&dstPtr2[j], (srcpx << (dst_depth - 8)) | (srcpx >> (16 - dst_depth))); \
00694                         } \
00695                         dstPtr2 += dstStride[plane] / 2; \
00696                         srcPtr  += srcStride[plane]; \
00697                     }
00698                     if (isBE(c->dstFormat)) {
00699                         COPY8TO9_OR_10(AV_WB16);
00700                     } else {
00701                         COPY8TO9_OR_10(AV_WL16);
00702                     }
00703                 }
00704             } else if (is16BPS(c->srcFormat) && !is16BPS(c->dstFormat)) {
00705                 const uint16_t *srcPtr2 = (const uint16_t *) srcPtr;
00706 #define COPY16TO8(rfunc) \
00707                     DITHER_COPY(dstPtr,  dstStride[plane],   W8, \
00708                                 srcPtr2, srcStride[plane] / 2, rfunc, \
00709                                 dither_8x8_256, 8, av_clip_uint8);
00710                 if (isBE(c->srcFormat)) {
00711                     COPY16TO8(AV_RB16);
00712                 } else {
00713                     COPY16TO8(AV_RL16);
00714                 }
00715             } else if (!is16BPS(c->srcFormat) && is16BPS(c->dstFormat)) {
00716                 for (i = 0; i < height; i++) {
00717                     for (j = 0; j < length; j++) {
00718                         dstPtr[ j << 1     ] = srcPtr[j];
00719                         dstPtr[(j << 1) + 1] = srcPtr[j];
00720                     }
00721                     srcPtr += srcStride[plane];
00722                     dstPtr += dstStride[plane];
00723                 }
00724             } else if (is16BPS(c->srcFormat) && is16BPS(c->dstFormat) &&
00725                       isBE(c->srcFormat) != isBE(c->dstFormat)) {
00726 
00727                 for (i = 0; i < height; i++) {
00728                     for (j = 0; j < length; j++)
00729                         ((uint16_t *) dstPtr)[j] = av_bswap16(((const uint16_t *) srcPtr)[j]);
00730                     srcPtr += srcStride[plane];
00731                     dstPtr += dstStride[plane];
00732                 }
00733             } else if (dstStride[plane] == srcStride[plane] &&
00734                        srcStride[plane] > 0 && srcStride[plane] == length) {
00735                 memcpy(dst[plane] + dstStride[plane] * y, src[plane],
00736                        height * dstStride[plane]);
00737             } else {
00738                 if (is16BPS(c->srcFormat) && is16BPS(c->dstFormat))
00739                     length *= 2;
00740                 else if (!av_pix_fmt_descriptors[c->srcFormat].comp[0].depth_minus1)
00741                     length >>= 3; // monowhite/black
00742                 for (i = 0; i < height; i++) {
00743                     memcpy(dstPtr, srcPtr, length);
00744                     srcPtr += srcStride[plane];
00745                     dstPtr += dstStride[plane];
00746                 }
00747             }
00748         }
00749     }
00750     return srcSliceH;
00751 }
00752 
00753 
00754 #define IS_DIFFERENT_ENDIANESS(src_fmt, dst_fmt, pix_fmt)          \
00755     ((src_fmt == pix_fmt ## BE && dst_fmt == pix_fmt ## LE) ||     \
00756      (src_fmt == pix_fmt ## LE && dst_fmt == pix_fmt ## BE))
00757 
00758 
00759 void ff_get_unscaled_swscale(SwsContext *c)
00760 {
00761     const enum PixelFormat srcFormat = c->srcFormat;
00762     const enum PixelFormat dstFormat = c->dstFormat;
00763     const int flags = c->flags;
00764     const int dstH = c->dstH;
00765     int needsDither;
00766 
00767     needsDither = isAnyRGB(dstFormat) &&
00768             c->dstFormatBpp < 24 &&
00769            (c->dstFormatBpp < c->srcFormatBpp || (!isAnyRGB(srcFormat)));
00770 
00771     /* yv12_to_nv12 */
00772     if ((srcFormat == PIX_FMT_YUV420P || srcFormat == PIX_FMT_YUVA420P) &&
00773         (dstFormat == PIX_FMT_NV12 || dstFormat == PIX_FMT_NV21)) {
00774         c->swScale = planarToNv12Wrapper;
00775     }
00776     /* yuv2bgr */
00777     if ((srcFormat == PIX_FMT_YUV420P || srcFormat == PIX_FMT_YUV422P ||
00778          srcFormat == PIX_FMT_YUVA420P) && isAnyRGB(dstFormat) &&
00779         !(flags & SWS_ACCURATE_RND) && !(dstH & 1)) {
00780         c->swScale = ff_yuv2rgb_get_func_ptr(c);
00781     }
00782 
00783     if (srcFormat == PIX_FMT_YUV410P &&
00784         (dstFormat == PIX_FMT_YUV420P || dstFormat == PIX_FMT_YUVA420P) &&
00785         !(flags & SWS_BITEXACT)) {
00786         c->swScale = yvu9ToYv12Wrapper;
00787     }
00788 
00789     /* bgr24toYV12 */
00790     if (srcFormat == PIX_FMT_BGR24 &&
00791         (dstFormat == PIX_FMT_YUV420P || dstFormat == PIX_FMT_YUVA420P) &&
00792         !(flags & SWS_ACCURATE_RND))
00793         c->swScale = bgr24ToYv12Wrapper;
00794 
00795     /* RGB/BGR -> RGB/BGR (no dither needed forms) */
00796     if (isAnyRGB(srcFormat) && isAnyRGB(dstFormat) && findRgbConvFn(c)
00797         && (!needsDither || (c->flags&(SWS_FAST_BILINEAR|SWS_POINT))))
00798         c->swScale= rgbToRgbWrapper;
00799 
00800     /* bswap 16 bits per pixel/component packed formats */
00801     if (IS_DIFFERENT_ENDIANESS(srcFormat, dstFormat, PIX_FMT_BGR444) ||
00802         IS_DIFFERENT_ENDIANESS(srcFormat, dstFormat, PIX_FMT_BGR48)  ||
00803         IS_DIFFERENT_ENDIANESS(srcFormat, dstFormat, PIX_FMT_BGR555) ||
00804         IS_DIFFERENT_ENDIANESS(srcFormat, dstFormat, PIX_FMT_BGR565) ||
00805         IS_DIFFERENT_ENDIANESS(srcFormat, dstFormat, PIX_FMT_GRAY16) ||
00806         IS_DIFFERENT_ENDIANESS(srcFormat, dstFormat, PIX_FMT_RGB444) ||
00807         IS_DIFFERENT_ENDIANESS(srcFormat, dstFormat, PIX_FMT_RGB48)  ||
00808         IS_DIFFERENT_ENDIANESS(srcFormat, dstFormat, PIX_FMT_RGB555) ||
00809         IS_DIFFERENT_ENDIANESS(srcFormat, dstFormat, PIX_FMT_RGB565))
00810         c->swScale = packed_16bpc_bswap;
00811 
00812     if ((usePal(srcFormat) && (
00813         dstFormat == PIX_FMT_RGB32   ||
00814         dstFormat == PIX_FMT_RGB32_1 ||
00815         dstFormat == PIX_FMT_RGB24   ||
00816         dstFormat == PIX_FMT_BGR32   ||
00817         dstFormat == PIX_FMT_BGR32_1 ||
00818         dstFormat == PIX_FMT_BGR24)))
00819         c->swScale = palToRgbWrapper;
00820 
00821     if (srcFormat == PIX_FMT_YUV422P) {
00822         if (dstFormat == PIX_FMT_YUYV422)
00823             c->swScale = yuv422pToYuy2Wrapper;
00824         else if (dstFormat == PIX_FMT_UYVY422)
00825             c->swScale = yuv422pToUyvyWrapper;
00826     }
00827 
00828     /* LQ converters if -sws 0 or -sws 4*/
00829     if (c->flags&(SWS_FAST_BILINEAR|SWS_POINT)) {
00830         /* yv12_to_yuy2 */
00831         if (srcFormat == PIX_FMT_YUV420P || srcFormat == PIX_FMT_YUVA420P) {
00832             if (dstFormat == PIX_FMT_YUYV422)
00833                 c->swScale = planarToYuy2Wrapper;
00834             else if (dstFormat == PIX_FMT_UYVY422)
00835                 c->swScale = planarToUyvyWrapper;
00836         }
00837     }
00838     if (srcFormat == PIX_FMT_YUYV422 &&
00839        (dstFormat == PIX_FMT_YUV420P || dstFormat == PIX_FMT_YUVA420P))
00840         c->swScale = yuyvToYuv420Wrapper;
00841     if (srcFormat == PIX_FMT_UYVY422 &&
00842        (dstFormat == PIX_FMT_YUV420P || dstFormat == PIX_FMT_YUVA420P))
00843         c->swScale = uyvyToYuv420Wrapper;
00844     if (srcFormat == PIX_FMT_YUYV422 && dstFormat == PIX_FMT_YUV422P)
00845         c->swScale = yuyvToYuv422Wrapper;
00846     if (srcFormat == PIX_FMT_UYVY422 && dstFormat == PIX_FMT_YUV422P)
00847         c->swScale = uyvyToYuv422Wrapper;
00848 
00849     /* simple copy */
00850     if ( srcFormat == dstFormat ||
00851         (srcFormat == PIX_FMT_YUVA420P && dstFormat == PIX_FMT_YUV420P) ||
00852         (srcFormat == PIX_FMT_YUV420P && dstFormat == PIX_FMT_YUVA420P) ||
00853         (isPlanarYUV(srcFormat) && isGray(dstFormat)) ||
00854         (isPlanarYUV(dstFormat) && isGray(srcFormat)) ||
00855         (isGray(dstFormat) && isGray(srcFormat)) ||
00856         (isPlanarYUV(srcFormat) && isPlanarYUV(dstFormat) &&
00857          c->chrDstHSubSample == c->chrSrcHSubSample &&
00858          c->chrDstVSubSample == c->chrSrcVSubSample &&
00859          dstFormat != PIX_FMT_NV12 && dstFormat != PIX_FMT_NV21 &&
00860          srcFormat != PIX_FMT_NV12 && srcFormat != PIX_FMT_NV21))
00861     {
00862         if (isPacked(c->srcFormat))
00863             c->swScale = packedCopyWrapper;
00864         else /* Planar YUV or gray */
00865             c->swScale = planarCopyWrapper;
00866     }
00867 
00868     if (ARCH_BFIN)
00869         ff_bfin_get_unscaled_swscale(c);
00870     if (HAVE_ALTIVEC)
00871         ff_swscale_get_unscaled_altivec(c);
00872 }
00873 
00874 static void reset_ptr(const uint8_t *src[], int format)
00875 {
00876     if (!isALPHA(format))
00877         src[3] = NULL;
00878     if (!isPlanar(format)) {
00879         src[3] = src[2] = NULL;
00880 
00881         if (!usePal(format))
00882             src[1] = NULL;
00883     }
00884 }
00885 
00886 static int check_image_pointers(uint8_t *data[4], enum PixelFormat pix_fmt,
00887                                 const int linesizes[4])
00888 {
00889     const AVPixFmtDescriptor *desc = &av_pix_fmt_descriptors[pix_fmt];
00890     int i;
00891 
00892     for (i = 0; i < 4; i++) {
00893         int plane = desc->comp[i].plane;
00894         if (!data[plane] || !linesizes[plane])
00895             return 0;
00896     }
00897 
00898     return 1;
00899 }
00900 
00905 int attribute_align_arg sws_scale(struct SwsContext *c,
00906                                   const uint8_t * const srcSlice[],
00907                                   const int srcStride[], int srcSliceY,
00908                                   int srcSliceH, uint8_t *const dst[],
00909                                   const int dstStride[])
00910 {
00911     int i;
00912     const uint8_t *src2[4] = { srcSlice[0], srcSlice[1], srcSlice[2], srcSlice[3] };
00913     uint8_t *dst2[4] = { dst[0], dst[1], dst[2], dst[3] };
00914 
00915     // do not mess up sliceDir if we have a "trailing" 0-size slice
00916     if (srcSliceH == 0)
00917         return 0;
00918 
00919     if (!check_image_pointers(srcSlice, c->srcFormat, srcStride)) {
00920         av_log(c, AV_LOG_ERROR, "bad src image pointers\n");
00921         return 0;
00922     }
00923     if (!check_image_pointers(dst, c->dstFormat, dstStride)) {
00924         av_log(c, AV_LOG_ERROR, "bad dst image pointers\n");
00925         return 0;
00926     }
00927 
00928     if (c->sliceDir == 0 && srcSliceY != 0 && srcSliceY + srcSliceH != c->srcH) {
00929         av_log(c, AV_LOG_ERROR, "Slices start in the middle!\n");
00930         return 0;
00931     }
00932     if (c->sliceDir == 0) {
00933         if (srcSliceY == 0) c->sliceDir = 1; else c->sliceDir = -1;
00934     }
00935 
00936     if (usePal(c->srcFormat)) {
00937         for (i = 0; i < 256; i++) {
00938             int p, r, g, b, y, u, v;
00939             if (c->srcFormat == PIX_FMT_PAL8) {
00940                 p = ((const uint32_t *)(srcSlice[1]))[i];
00941                 r = (p >> 16) & 0xFF;
00942                 g = (p >>  8) & 0xFF;
00943                 b =  p        & 0xFF;
00944             } else if (c->srcFormat == PIX_FMT_RGB8) {
00945                 r = ( i >> 5     ) * 36;
00946                 g = ((i >> 2) & 7) * 36;
00947                 b = ( i       & 3) * 85;
00948             } else if (c->srcFormat == PIX_FMT_BGR8) {
00949                 b = ( i >> 6     ) * 85;
00950                 g = ((i >> 3) & 7) * 36;
00951                 r = ( i       & 7) * 36;
00952             } else if (c->srcFormat == PIX_FMT_RGB4_BYTE) {
00953                 r = ( i >> 3     ) * 255;
00954                 g = ((i >> 1) & 3) * 85;
00955                 b = ( i       & 1) * 255;
00956             } else if (c->srcFormat == PIX_FMT_GRAY8 ||
00957                       c->srcFormat == PIX_FMT_Y400A) {
00958                 r = g = b = i;
00959             } else {
00960                 assert(c->srcFormat == PIX_FMT_BGR4_BYTE);
00961                 b = ( i >> 3     ) * 255;
00962                 g = ((i >> 1) & 3) * 85;
00963                 r = ( i       & 1) * 255;
00964             }
00965             y = av_clip_uint8((RY * r + GY * g + BY * b + ( 33 << (RGB2YUV_SHIFT - 1))) >> RGB2YUV_SHIFT);
00966             u = av_clip_uint8((RU * r + GU * g + BU * b + (257 << (RGB2YUV_SHIFT - 1))) >> RGB2YUV_SHIFT);
00967             v = av_clip_uint8((RV * r + GV * g + BV * b + (257 << (RGB2YUV_SHIFT - 1))) >> RGB2YUV_SHIFT);
00968             c->pal_yuv[i] = y + (u << 8) + (v << 16);
00969 
00970             switch (c->dstFormat) {
00971             case PIX_FMT_BGR32:
00972 #if !HAVE_BIGENDIAN
00973             case PIX_FMT_RGB24:
00974 #endif
00975                 c->pal_rgb[i] =  r + (g << 8) + (b << 16);
00976                 break;
00977             case PIX_FMT_BGR32_1:
00978 #if HAVE_BIGENDIAN
00979             case PIX_FMT_BGR24:
00980 #endif
00981                 c->pal_rgb[i] = (r + (g << 8) + (b << 16)) << 8;
00982                 break;
00983             case PIX_FMT_RGB32_1:
00984 #if HAVE_BIGENDIAN
00985             case PIX_FMT_RGB24:
00986 #endif
00987                 c->pal_rgb[i] = (b + (g << 8) + (r << 16)) << 8;
00988                 break;
00989             case PIX_FMT_RGB32:
00990 #if !HAVE_BIGENDIAN
00991             case PIX_FMT_BGR24:
00992 #endif
00993             default:
00994                 c->pal_rgb[i] =  b + (g << 8) + (r << 16);
00995             }
00996         }
00997     }
00998 
00999     // copy strides, so they can safely be modified
01000     if (c->sliceDir == 1) {
01001         // slices go from top to bottom
01002         int srcStride2[4] = { srcStride[0], srcStride[1], srcStride[2],
01003                               srcStride[3] };
01004         int dstStride2[4] = { dstStride[0], dstStride[1], dstStride[2],
01005                               dstStride[3] };
01006 
01007         reset_ptr(src2, c->srcFormat);
01008         reset_ptr((const uint8_t **) dst2, c->dstFormat);
01009 
01010         /* reset slice direction at end of frame */
01011         if (srcSliceY + srcSliceH == c->srcH)
01012             c->sliceDir = 0;
01013 
01014         return c->swScale(c, src2, srcStride2, srcSliceY, srcSliceH, dst2,
01015                           dstStride2);
01016     } else {
01017         // slices go from bottom to top => we flip the image internally
01018         int srcStride2[4] = { -srcStride[0], -srcStride[1], -srcStride[2],
01019                               -srcStride[3] };
01020         int dstStride2[4] = { -dstStride[0], -dstStride[1], -dstStride[2],
01021                               -dstStride[3] };
01022 
01023         src2[0] += (srcSliceH - 1) * srcStride[0];
01024         if (!usePal(c->srcFormat))
01025             src2[1] += ((srcSliceH >> c->chrSrcVSubSample) - 1) * srcStride[1];
01026         src2[2] += ((srcSliceH >> c->chrSrcVSubSample) - 1) * srcStride[2];
01027         src2[3] += (srcSliceH - 1) * srcStride[3];
01028         dst2[0] += ( c->dstH                         - 1) * dstStride[0];
01029         dst2[1] += ((c->dstH >> c->chrDstVSubSample) - 1) * dstStride[1];
01030         dst2[2] += ((c->dstH >> c->chrDstVSubSample) - 1) * dstStride[2];
01031         dst2[3] += ( c->dstH                         - 1) * dstStride[3];
01032 
01033         reset_ptr(src2, c->srcFormat);
01034         reset_ptr((const uint8_t **) dst2, c->dstFormat);
01035 
01036         /* reset slice direction at end of frame */
01037         if (!srcSliceY)
01038             c->sliceDir = 0;
01039 
01040         return c->swScale(c, src2, srcStride2, c->srcH-srcSliceY-srcSliceH,
01041                           srcSliceH, dst2, dstStride2);
01042     }
01043 }
01044 
01045 /* Convert the palette to the same packed 32-bit format as the palette */
01046 void sws_convertPalette8ToPacked32(const uint8_t *src, uint8_t *dst,
01047                                    int num_pixels, const uint8_t *palette)
01048 {
01049     int i;
01050 
01051     for (i = 0; i < num_pixels; i++)
01052         ((uint32_t *) dst)[i] = ((const uint32_t *) palette)[src[i]];
01053 }
01054 
01055 /* Palette format: ABCD -> dst format: ABC */
01056 void sws_convertPalette8ToPacked24(const uint8_t *src, uint8_t *dst,
01057                                    int num_pixels, const uint8_t *palette)
01058 {
01059     int i;
01060 
01061     for (i = 0; i < num_pixels; i++) {
01062         //FIXME slow?
01063         dst[0] = palette[src[i] * 4 + 0];
01064         dst[1] = palette[src[i] * 4 + 1];
01065         dst[2] = palette[src[i] * 4 + 2];
01066         dst += 3;
01067     }
01068 }
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