FFmpeg: libswscale/swscale_unscaled.c Source File

00001 /*
00002  * Copyright (C) 2001-2011 Michael Niedermayer <michaelni@gmx.at>
00003  *
00004  * This file is part of FFmpeg.
00005  *
00006  * FFmpeg 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  * FFmpeg 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 FFmpeg; 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 #define RGB2YUV_SHIFT 15
00038 #define BY ( (int) (0.114 * 219 / 255 * (1 << RGB2YUV_SHIFT) + 0.5))
00039 #define BV (-(int) (0.081 * 224 / 255 * (1 << RGB2YUV_SHIFT) + 0.5))
00040 #define BU ( (int) (0.500 * 224 / 255 * (1 << RGB2YUV_SHIFT) + 0.5))
00041 #define GY ( (int) (0.587 * 219 / 255 * (1 << RGB2YUV_SHIFT) + 0.5))
00042 #define GV (-(int) (0.419 * 224 / 255 * (1 << RGB2YUV_SHIFT) + 0.5))
00043 #define GU (-(int) (0.331 * 224 / 255 * (1 << RGB2YUV_SHIFT) + 0.5))
00044 #define RY ( (int) (0.299 * 219 / 255 * (1 << RGB2YUV_SHIFT) + 0.5))
00045 #define RV ( (int) (0.500 * 224 / 255 * (1 << RGB2YUV_SHIFT) + 0.5))
00046 #define RU (-(int) (0.169 * 224 / 255 * (1 << RGB2YUV_SHIFT) + 0.5))
00047 
00048 DECLARE_ALIGNED(8, const uint8_t, dithers)[8][8][8]={
00049 {
00050   {   0,  1,  0,  1,  0,  1,  0,  1,},
00051   {   1,  0,  1,  0,  1,  0,  1,  0,},
00052   {   0,  1,  0,  1,  0,  1,  0,  1,},
00053   {   1,  0,  1,  0,  1,  0,  1,  0,},
00054   {   0,  1,  0,  1,  0,  1,  0,  1,},
00055   {   1,  0,  1,  0,  1,  0,  1,  0,},
00056   {   0,  1,  0,  1,  0,  1,  0,  1,},
00057   {   1,  0,  1,  0,  1,  0,  1,  0,},
00058 },{
00059   {   1,  2,  1,  2,  1,  2,  1,  2,},
00060   {   3,  0,  3,  0,  3,  0,  3,  0,},
00061   {   1,  2,  1,  2,  1,  2,  1,  2,},
00062   {   3,  0,  3,  0,  3,  0,  3,  0,},
00063   {   1,  2,  1,  2,  1,  2,  1,  2,},
00064   {   3,  0,  3,  0,  3,  0,  3,  0,},
00065   {   1,  2,  1,  2,  1,  2,  1,  2,},
00066   {   3,  0,  3,  0,  3,  0,  3,  0,},
00067 },{
00068   {   2,  4,  3,  5,  2,  4,  3,  5,},
00069   {   6,  0,  7,  1,  6,  0,  7,  1,},
00070   {   3,  5,  2,  4,  3,  5,  2,  4,},
00071   {   7,  1,  6,  0,  7,  1,  6,  0,},
00072   {   2,  4,  3,  5,  2,  4,  3,  5,},
00073   {   6,  0,  7,  1,  6,  0,  7,  1,},
00074   {   3,  5,  2,  4,  3,  5,  2,  4,},
00075   {   7,  1,  6,  0,  7,  1,  6,  0,},
00076 },{
00077   {   4,  8,  7, 11,  4,  8,  7, 11,},
00078   {  12,  0, 15,  3, 12,  0, 15,  3,},
00079   {   6, 10,  5,  9,  6, 10,  5,  9,},
00080   {  14,  2, 13,  1, 14,  2, 13,  1,},
00081   {   4,  8,  7, 11,  4,  8,  7, 11,},
00082   {  12,  0, 15,  3, 12,  0, 15,  3,},
00083   {   6, 10,  5,  9,  6, 10,  5,  9,},
00084   {  14,  2, 13,  1, 14,  2, 13,  1,},
00085 },{
00086   {   9, 17, 15, 23,  8, 16, 14, 22,},
00087   {  25,  1, 31,  7, 24,  0, 30,  6,},
00088   {  13, 21, 11, 19, 12, 20, 10, 18,},
00089   {  29,  5, 27,  3, 28,  4, 26,  2,},
00090   {   8, 16, 14, 22,  9, 17, 15, 23,},
00091   {  24,  0, 30,  6, 25,  1, 31,  7,},
00092   {  12, 20, 10, 18, 13, 21, 11, 19,},
00093   {  28,  4, 26,  2, 29,  5, 27,  3,},
00094 },{
00095   {  18, 34, 30, 46, 17, 33, 29, 45,},
00096   {  50,  2, 62, 14, 49,  1, 61, 13,},
00097   {  26, 42, 22, 38, 25, 41, 21, 37,},
00098   {  58, 10, 54,  6, 57,  9, 53,  5,},
00099   {  16, 32, 28, 44, 19, 35, 31, 47,},
00100   {  48,  0, 60, 12, 51,  3, 63, 15,},
00101   {  24, 40, 20, 36, 27, 43, 23, 39,},
00102   {  56,  8, 52,  4, 59, 11, 55,  7,},
00103 },{
00104   {  18, 34, 30, 46, 17, 33, 29, 45,},
00105   {  50,  2, 62, 14, 49,  1, 61, 13,},
00106   {  26, 42, 22, 38, 25, 41, 21, 37,},
00107   {  58, 10, 54,  6, 57,  9, 53,  5,},
00108   {  16, 32, 28, 44, 19, 35, 31, 47,},
00109   {  48,  0, 60, 12, 51,  3, 63, 15,},
00110   {  24, 40, 20, 36, 27, 43, 23, 39,},
00111   {  56,  8, 52,  4, 59, 11, 55,  7,},
00112 },{
00113   {  36, 68, 60, 92, 34, 66, 58, 90,},
00114   { 100,  4,124, 28, 98,  2,122, 26,},
00115   {  52, 84, 44, 76, 50, 82, 42, 74,},
00116   { 116, 20,108, 12,114, 18,106, 10,},
00117   {  32, 64, 56, 88, 38, 70, 62, 94,},
00118   {  96,  0,120, 24,102,  6,126, 30,},
00119   {  48, 80, 40, 72, 54, 86, 46, 78,},
00120   { 112, 16,104,  8,118, 22,110, 14,},
00121 }};
00122 
00123 static const uint8_t flat64[8]={64,64,64,64,64,64,64,64};
00124 
00125 const uint16_t dither_scale[15][16]={
00126 {    2,    3,    3,    5,    5,    5,    5,    5,    5,    5,    5,    5,    5,    5,    5,    5,},
00127 {    2,    3,    7,    7,   13,   13,   25,   25,   25,   25,   25,   25,   25,   25,   25,   25,},
00128 {    3,    3,    4,   15,   15,   29,   57,   57,   57,  113,  113,  113,  113,  113,  113,  113,},
00129 {    3,    4,    4,    5,   31,   31,   61,  121,  241,  241,  241,  241,  481,  481,  481,  481,},
00130 {    3,    4,    5,    5,    6,   63,   63,  125,  249,  497,  993,  993,  993,  993,  993, 1985,},
00131 {    3,    5,    6,    6,    6,    7,  127,  127,  253,  505, 1009, 2017, 4033, 4033, 4033, 4033,},
00132 {    3,    5,    6,    7,    7,    7,    8,  255,  255,  509, 1017, 2033, 4065, 8129,16257,16257,},
00133 {    3,    5,    6,    8,    8,    8,    8,    9,  511,  511, 1021, 2041, 4081, 8161,16321,32641,},
00134 {    3,    5,    7,    8,    9,    9,    9,    9,   10, 1023, 1023, 2045, 4089, 8177,16353,32705,},
00135 {    3,    5,    7,    8,   10,   10,   10,   10,   10,   11, 2047, 2047, 4093, 8185,16369,32737,},
00136 {    3,    5,    7,    8,   10,   11,   11,   11,   11,   11,   12, 4095, 4095, 8189,16377,32753,},
00137 {    3,    5,    7,    9,   10,   12,   12,   12,   12,   12,   12,   13, 8191, 8191,16381,32761,},
00138 {    3,    5,    7,    9,   10,   12,   13,   13,   13,   13,   13,   13,   14,16383,16383,32765,},
00139 {    3,    5,    7,    9,   10,   12,   14,   14,   14,   14,   14,   14,   14,   15,32767,32767,},
00140 {    3,    5,    7,    9,   11,   12,   14,   15,   15,   15,   15,   15,   15,   15,   16,65535,},
00141 };
00142 
00143 
00144 static void fillPlane(uint8_t *plane, int stride, int width, int height, int y,
00145                       uint8_t val)
00146 {
00147     int i;
00148     uint8_t *ptr = plane + stride * y;
00149     for (i = 0; i < height; i++) {
00150         memset(ptr, val, width);
00151         ptr += stride;
00152     }
00153 }
00154 
00155 static void fillPlane16(uint8_t *plane, int stride, int width, int height, int y,
00156                       int alpha, int bits)
00157 {
00158     int i, j;
00159     uint8_t *ptr = plane + stride * y;
00160     int v = alpha ? -1 : (1<<bits);
00161     for (i = 0; i < height; i++) {
00162         for (j = 0; j < width; j++) {
00163             AV_WN16(ptr+2*j, v);
00164         }
00165         ptr += stride;
00166     }
00167 }
00168 
00169 static void copyPlane(const uint8_t *src, int srcStride,
00170                       int srcSliceY, int srcSliceH, int width,
00171                       uint8_t *dst, int dstStride)
00172 {
00173     dst += dstStride * srcSliceY;
00174     if (dstStride == srcStride && srcStride > 0) {
00175         memcpy(dst, src, srcSliceH * dstStride);
00176     } else {
00177         int i;
00178         for (i = 0; i < srcSliceH; i++) {
00179             memcpy(dst, src, width);
00180             src += srcStride;
00181             dst += dstStride;
00182         }
00183     }
00184 }
00185 
00186 static int planarToNv12Wrapper(SwsContext *c, const uint8_t *src[],
00187                                int srcStride[], int srcSliceY,
00188                                int srcSliceH, uint8_t *dstParam[],
00189                                int dstStride[])
00190 {
00191     uint8_t *dst = dstParam[1] + dstStride[1] * srcSliceY / 2;
00192 
00193     copyPlane(src[0], srcStride[0], srcSliceY, srcSliceH, c->srcW,
00194               dstParam[0], dstStride[0]);
00195 
00196     if (c->dstFormat == PIX_FMT_NV12)
00197         interleaveBytes(src[1], src[2], dst, c->srcW / 2, srcSliceH / 2,
00198                         srcStride[1], srcStride[2], dstStride[0]);
00199     else
00200         interleaveBytes(src[2], src[1], dst, c->srcW / 2, srcSliceH / 2,
00201                         srcStride[2], srcStride[1], dstStride[0]);
00202 
00203     return srcSliceH;
00204 }
00205 
00206 static int planarToYuy2Wrapper(SwsContext *c, const uint8_t *src[],
00207                                int srcStride[], int srcSliceY, int srcSliceH,
00208                                uint8_t *dstParam[], int dstStride[])
00209 {
00210     uint8_t *dst = dstParam[0] + dstStride[0] * srcSliceY;
00211 
00212     yv12toyuy2(src[0], src[1], src[2], dst, c->srcW, srcSliceH, srcStride[0],
00213                srcStride[1], dstStride[0]);
00214 
00215     return srcSliceH;
00216 }
00217 
00218 static int planarToUyvyWrapper(SwsContext *c, const uint8_t *src[],
00219                                int srcStride[], int srcSliceY, int srcSliceH,
00220                                uint8_t *dstParam[], int dstStride[])
00221 {
00222     uint8_t *dst = dstParam[0] + dstStride[0] * srcSliceY;
00223 
00224     yv12touyvy(src[0], src[1], src[2], dst, c->srcW, srcSliceH, srcStride[0],
00225                srcStride[1], dstStride[0]);
00226 
00227     return srcSliceH;
00228 }
00229 
00230 static int yuv422pToYuy2Wrapper(SwsContext *c, const uint8_t *src[],
00231                                 int srcStride[], int srcSliceY, int srcSliceH,
00232                                 uint8_t *dstParam[], int dstStride[])
00233 {
00234     uint8_t *dst = dstParam[0] + dstStride[0] * srcSliceY;
00235 
00236     yuv422ptoyuy2(src[0], src[1], src[2], dst, c->srcW, srcSliceH, srcStride[0],
00237                   srcStride[1], dstStride[0]);
00238 
00239     return srcSliceH;
00240 }
00241 
00242 static int yuv422pToUyvyWrapper(SwsContext *c, const uint8_t *src[],
00243                                 int srcStride[], int srcSliceY, int srcSliceH,
00244                                 uint8_t *dstParam[], int dstStride[])
00245 {
00246     uint8_t *dst = dstParam[0] + dstStride[0] * srcSliceY;
00247 
00248     yuv422ptouyvy(src[0], src[1], src[2], dst, c->srcW, srcSliceH, srcStride[0],
00249                   srcStride[1], dstStride[0]);
00250 
00251     return srcSliceH;
00252 }
00253 
00254 static int yuyvToYuv420Wrapper(SwsContext *c, const uint8_t *src[],
00255                                int srcStride[], int srcSliceY, int srcSliceH,
00256                                uint8_t *dstParam[], int dstStride[])
00257 {
00258     uint8_t *ydst = dstParam[0] + dstStride[0] * srcSliceY;
00259     uint8_t *udst = dstParam[1] + dstStride[1] * srcSliceY / 2;
00260     uint8_t *vdst = dstParam[2] + dstStride[2] * srcSliceY / 2;
00261 
00262     yuyvtoyuv420(ydst, udst, vdst, src[0], c->srcW, srcSliceH, dstStride[0],
00263                  dstStride[1], srcStride[0]);
00264 
00265     if (dstParam[3])
00266         fillPlane(dstParam[3], dstStride[3], c->srcW, srcSliceH, srcSliceY, 255);
00267 
00268     return srcSliceH;
00269 }
00270 
00271 static int yuyvToYuv422Wrapper(SwsContext *c, const uint8_t *src[],
00272                                int srcStride[], int srcSliceY, int srcSliceH,
00273                                uint8_t *dstParam[], int dstStride[])
00274 {
00275     uint8_t *ydst = dstParam[0] + dstStride[0] * srcSliceY;
00276     uint8_t *udst = dstParam[1] + dstStride[1] * srcSliceY;
00277     uint8_t *vdst = dstParam[2] + dstStride[2] * srcSliceY;
00278 
00279     yuyvtoyuv422(ydst, udst, vdst, src[0], c->srcW, srcSliceH, dstStride[0],
00280                  dstStride[1], srcStride[0]);
00281 
00282     return srcSliceH;
00283 }
00284 
00285 static int uyvyToYuv420Wrapper(SwsContext *c, const uint8_t *src[],
00286                                int srcStride[], int srcSliceY, int srcSliceH,
00287                                uint8_t *dstParam[], int dstStride[])
00288 {
00289     uint8_t *ydst = dstParam[0] + dstStride[0] * srcSliceY;
00290     uint8_t *udst = dstParam[1] + dstStride[1] * srcSliceY / 2;
00291     uint8_t *vdst = dstParam[2] + dstStride[2] * srcSliceY / 2;
00292 
00293     uyvytoyuv420(ydst, udst, vdst, src[0], c->srcW, srcSliceH, dstStride[0],
00294                  dstStride[1], srcStride[0]);
00295 
00296     if (dstParam[3])
00297         fillPlane(dstParam[3], dstStride[3], c->srcW, srcSliceH, srcSliceY, 255);
00298 
00299     return srcSliceH;
00300 }
00301 
00302 static int uyvyToYuv422Wrapper(SwsContext *c, const uint8_t *src[],
00303                                int srcStride[], int srcSliceY, int srcSliceH,
00304                                uint8_t *dstParam[], int dstStride[])
00305 {
00306     uint8_t *ydst = dstParam[0] + dstStride[0] * srcSliceY;
00307     uint8_t *udst = dstParam[1] + dstStride[1] * srcSliceY;
00308     uint8_t *vdst = dstParam[2] + dstStride[2] * srcSliceY;
00309 
00310     uyvytoyuv422(ydst, udst, vdst, src[0], c->srcW, srcSliceH, dstStride[0],
00311                  dstStride[1], srcStride[0]);
00312 
00313     return srcSliceH;
00314 }
00315 
00316 static void gray8aToPacked32(const uint8_t *src, uint8_t *dst, int num_pixels,
00317                              const uint8_t *palette)
00318 {
00319     int i;
00320     for (i = 0; i < num_pixels; i++)
00321         ((uint32_t *) dst)[i] = ((const uint32_t *) palette)[src[i << 1]] | (src[(i << 1) + 1] << 24);
00322 }
00323 
00324 static void gray8aToPacked32_1(const uint8_t *src, uint8_t *dst, int num_pixels,
00325                                const uint8_t *palette)
00326 {
00327     int i;
00328 
00329     for (i = 0; i < num_pixels; i++)
00330         ((uint32_t *) dst)[i] = ((const uint32_t *) palette)[src[i << 1]] | src[(i << 1) + 1];
00331 }
00332 
00333 static void gray8aToPacked24(const uint8_t *src, uint8_t *dst, int num_pixels,
00334                              const uint8_t *palette)
00335 {
00336     int i;
00337 
00338     for (i = 0; i < num_pixels; i++) {
00339         //FIXME slow?
00340         dst[0] = palette[src[i << 1] * 4 + 0];
00341         dst[1] = palette[src[i << 1] * 4 + 1];
00342         dst[2] = palette[src[i << 1] * 4 + 2];
00343         dst += 3;
00344     }
00345 }
00346 
00347 static int packed_16bpc_bswap(SwsContext *c, const uint8_t *src[],
00348                               int srcStride[], int srcSliceY, int srcSliceH,
00349                               uint8_t *dst[], int dstStride[])
00350 {
00351     int i, j;
00352     int srcstr = srcStride[0] >> 1;
00353     int dststr = dstStride[0] >> 1;
00354     uint16_t       *dstPtr =       (uint16_t *) dst[0];
00355     const uint16_t *srcPtr = (const uint16_t *) src[0];
00356     int min_stride         = FFMIN(srcstr, dststr);
00357 
00358     for (i = 0; i < srcSliceH; i++) {
00359         for (j = 0; j < min_stride; j++) {
00360             dstPtr[j] = av_bswap16(srcPtr[j]);
00361         }
00362         srcPtr += srcstr;
00363         dstPtr += dststr;
00364     }
00365 
00366     return srcSliceH;
00367 }
00368 
00369 static int palToRgbWrapper(SwsContext *c, const uint8_t *src[], int srcStride[],
00370                            int srcSliceY, int srcSliceH, uint8_t *dst[],
00371                            int dstStride[])
00372 {
00373     const enum PixelFormat srcFormat = c->srcFormat;
00374     const enum PixelFormat dstFormat = c->dstFormat;
00375     void (*conv)(const uint8_t *src, uint8_t *dst, int num_pixels,
00376                  const uint8_t *palette) = NULL;
00377     int i;
00378     uint8_t *dstPtr = dst[0] + dstStride[0] * srcSliceY;
00379     const uint8_t *srcPtr = src[0];
00380 
00381     if (srcFormat == PIX_FMT_GRAY8A) {
00382         switch (dstFormat) {
00383         case PIX_FMT_RGB32  : conv = gray8aToPacked32; break;
00384         case PIX_FMT_BGR32  : conv = gray8aToPacked32; break;
00385         case PIX_FMT_BGR32_1: conv = gray8aToPacked32_1; break;
00386         case PIX_FMT_RGB32_1: conv = gray8aToPacked32_1; break;
00387         case PIX_FMT_RGB24  : conv = gray8aToPacked24; break;
00388         case PIX_FMT_BGR24  : conv = gray8aToPacked24; break;
00389         }
00390     } else if (usePal(srcFormat)) {
00391         switch (dstFormat) {
00392         case PIX_FMT_RGB32  : conv = sws_convertPalette8ToPacked32; break;
00393         case PIX_FMT_BGR32  : conv = sws_convertPalette8ToPacked32; break;
00394         case PIX_FMT_BGR32_1: conv = sws_convertPalette8ToPacked32; break;
00395         case PIX_FMT_RGB32_1: conv = sws_convertPalette8ToPacked32; break;
00396         case PIX_FMT_RGB24  : conv = sws_convertPalette8ToPacked24; break;
00397         case PIX_FMT_BGR24  : conv = sws_convertPalette8ToPacked24; break;
00398         }
00399     }
00400 
00401     if (!conv)
00402         av_log(c, AV_LOG_ERROR, "internal error %s -> %s converter\n",
00403                av_get_pix_fmt_name(srcFormat), av_get_pix_fmt_name(dstFormat));
00404     else {
00405         for (i = 0; i < srcSliceH; i++) {
00406             conv(srcPtr, dstPtr, c->srcW, (uint8_t *) c->pal_rgb);
00407             srcPtr += srcStride[0];
00408             dstPtr += dstStride[0];
00409         }
00410     }
00411 
00412     return srcSliceH;
00413 }
00414 
00415 static void gbr24ptopacked24(const uint8_t *src[], int srcStride[],
00416                              uint8_t *dst, int dstStride, int srcSliceH,
00417                              int width)
00418 {
00419     int x, h, i;
00420     for (h = 0; h < srcSliceH; h++) {
00421         uint8_t *dest = dst + dstStride * h;
00422         for (x = 0; x < width; x++) {
00423             *dest++ = src[0][x];
00424             *dest++ = src[1][x];
00425             *dest++ = src[2][x];
00426         }
00427 
00428         for (i = 0; i < 3; i++)
00429             src[i] += srcStride[i];
00430     }
00431 }
00432 
00433 static void gbr24ptopacked32(const uint8_t *src[], int srcStride[],
00434                              uint8_t *dst, int dstStride, int srcSliceH,
00435                              int alpha_first, int width)
00436 {
00437     int x, h, i;
00438     for (h = 0; h < srcSliceH; h++) {
00439         uint8_t *dest = dst + dstStride * h;
00440 
00441         if (alpha_first) {
00442             for (x = 0; x < width; x++) {
00443                 *dest++ = 0xff;
00444                 *dest++ = src[0][x];
00445                 *dest++ = src[1][x];
00446                 *dest++ = src[2][x];
00447             }
00448         } else {
00449             for (x = 0; x < width; x++) {
00450                 *dest++ = src[0][x];
00451                 *dest++ = src[1][x];
00452                 *dest++ = src[2][x];
00453                 *dest++ = 0xff;
00454             }
00455         }
00456 
00457         for (i = 0; i < 3; i++)
00458             src[i] += srcStride[i];
00459     }
00460 }
00461 
00462 static int planarRgbToRgbWrapper(SwsContext *c, const uint8_t *src[],
00463                                  int srcStride[], int srcSliceY, int srcSliceH,
00464                                  uint8_t *dst[], int dstStride[])
00465 {
00466     int alpha_first = 0;
00467     if (c->srcFormat != PIX_FMT_GBRP) {
00468         av_log(c, AV_LOG_ERROR, "unsupported planar RGB conversion %s -> %s\n",
00469                av_get_pix_fmt_name(c->srcFormat),
00470                av_get_pix_fmt_name(c->dstFormat));
00471         return srcSliceH;
00472     }
00473 
00474     switch (c->dstFormat) {
00475     case PIX_FMT_BGR24:
00476         gbr24ptopacked24((const uint8_t *[]) { src[1], src[0], src[2] },
00477                          (int []) { srcStride[1], srcStride[0], srcStride[2] },
00478                          dst[0] + srcSliceY * dstStride[0], dstStride[0],
00479                          srcSliceH, c->srcW);
00480         break;
00481 
00482     case PIX_FMT_RGB24:
00483         gbr24ptopacked24((const uint8_t *[]) { src[2], src[0], src[1] },
00484                          (int []) { srcStride[2], srcStride[0], srcStride[1] },
00485                          dst[0] + srcSliceY * dstStride[0], dstStride[0],
00486                          srcSliceH, c->srcW);
00487         break;
00488 
00489     case PIX_FMT_ARGB:
00490         alpha_first = 1;
00491     case PIX_FMT_RGBA:
00492         gbr24ptopacked32((const uint8_t *[]) { src[2], src[0], src[1] },
00493                          (int []) { srcStride[2], srcStride[0], srcStride[1] },
00494                          dst[0] + srcSliceY * dstStride[0], dstStride[0],
00495                          srcSliceH, alpha_first, c->srcW);
00496         break;
00497 
00498     case PIX_FMT_ABGR:
00499         alpha_first = 1;
00500     case PIX_FMT_BGRA:
00501         gbr24ptopacked32((const uint8_t *[]) { src[1], src[0], src[2] },
00502                          (int []) { srcStride[1], srcStride[0], srcStride[2] },
00503                          dst[0] + srcSliceY * dstStride[0], dstStride[0],
00504                          srcSliceH, alpha_first, c->srcW);
00505         break;
00506 
00507     default:
00508         av_log(c, AV_LOG_ERROR,
00509                "unsupported planar RGB conversion %s -> %s\n",
00510                av_get_pix_fmt_name(c->srcFormat),
00511                av_get_pix_fmt_name(c->dstFormat));
00512     }
00513 
00514     return srcSliceH;
00515 }
00516 
00517 #define isRGBA32(x) (            \
00518            (x) == PIX_FMT_ARGB   \
00519         || (x) == PIX_FMT_RGBA   \
00520         || (x) == PIX_FMT_BGRA   \
00521         || (x) == PIX_FMT_ABGR   \
00522         )
00523 
00524 /* {RGB,BGR}{15,16,24,32,32_1} -> {RGB,BGR}{15,16,24,32} */
00525 typedef void (* rgbConvFn) (const uint8_t *, uint8_t *, int);
00526 static rgbConvFn findRgbConvFn(SwsContext *c)
00527 {
00528     const enum PixelFormat srcFormat = c->srcFormat;
00529     const enum PixelFormat dstFormat = c->dstFormat;
00530     const int srcId = c->srcFormatBpp;
00531     const int dstId = c->dstFormatBpp;
00532     rgbConvFn conv = NULL;
00533 
00534 #define IS_NOT_NE(bpp, fmt) \
00535     (((bpp + 7) >> 3) == 2 && \
00536      (!(av_pix_fmt_descriptors[fmt].flags & PIX_FMT_BE) != !HAVE_BIGENDIAN))
00537 
00538     /* if this is non-native rgb444/555/565, don't handle it here. */
00539     if (IS_NOT_NE(srcId, srcFormat) || IS_NOT_NE(dstId, dstFormat))
00540         return NULL;
00541 
00542 #define CONV_IS(src, dst) (srcFormat == PIX_FMT_##src && dstFormat == PIX_FMT_##dst)
00543 
00544     if (isRGBA32(srcFormat) && isRGBA32(dstFormat)) {
00545         if (     CONV_IS(ABGR, RGBA)
00546               || CONV_IS(ARGB, BGRA)
00547               || CONV_IS(BGRA, ARGB)
00548               || CONV_IS(RGBA, ABGR)) conv = shuffle_bytes_3210;
00549         else if (CONV_IS(ABGR, ARGB)
00550               || CONV_IS(ARGB, ABGR)) conv = shuffle_bytes_0321;
00551         else if (CONV_IS(ABGR, BGRA)
00552               || CONV_IS(ARGB, RGBA)) conv = shuffle_bytes_1230;
00553         else if (CONV_IS(BGRA, RGBA)
00554               || CONV_IS(RGBA, BGRA)) conv = shuffle_bytes_2103;
00555         else if (CONV_IS(BGRA, ABGR)
00556               || CONV_IS(RGBA, ARGB)) conv = shuffle_bytes_3012;
00557     } else
00558     /* BGR -> BGR */
00559     if ((isBGRinInt(srcFormat) && isBGRinInt(dstFormat)) ||
00560         (isRGBinInt(srcFormat) && isRGBinInt(dstFormat))) {
00561         switch (srcId | (dstId << 16)) {
00562         case 0x000F000C: conv = rgb12to15; break;
00563         case 0x000F0010: conv = rgb16to15; break;
00564         case 0x000F0018: conv = rgb24to15; break;
00565         case 0x000F0020: conv = rgb32to15; break;
00566         case 0x0010000F: conv = rgb15to16; break;
00567         case 0x00100018: conv = rgb24to16; break;
00568         case 0x00100020: conv = rgb32to16; break;
00569         case 0x0018000F: conv = rgb15to24; break;
00570         case 0x00180010: conv = rgb16to24; break;
00571         case 0x00180020: conv = rgb32to24; break;
00572         case 0x0020000F: conv = rgb15to32; break;
00573         case 0x00200010: conv = rgb16to32; break;
00574         case 0x00200018: conv = rgb24to32; break;
00575         }
00576     } else if ((isBGRinInt(srcFormat) && isRGBinInt(dstFormat)) ||
00577                (isRGBinInt(srcFormat) && isBGRinInt(dstFormat))) {
00578         switch (srcId | (dstId << 16)) {
00579         case 0x000C000C: conv = rgb12tobgr12; break;
00580         case 0x000F000F: conv = rgb15tobgr15; break;
00581         case 0x000F0010: conv = rgb16tobgr15; break;
00582         case 0x000F0018: conv = rgb24tobgr15; break;
00583         case 0x000F0020: conv = rgb32tobgr15; break;
00584         case 0x0010000F: conv = rgb15tobgr16; break;
00585         case 0x00100010: conv = rgb16tobgr16; break;
00586         case 0x00100018: conv = rgb24tobgr16; break;
00587         case 0x00100020: conv = rgb32tobgr16; break;
00588         case 0x0018000F: conv = rgb15tobgr24; break;
00589         case 0x00180010: conv = rgb16tobgr24; break;
00590         case 0x00180018: conv = rgb24tobgr24; break;
00591         case 0x00180020: conv = rgb32tobgr24; break;
00592         case 0x0020000F: conv = rgb15tobgr32; break;
00593         case 0x00200010: conv = rgb16tobgr32; break;
00594         case 0x00200018: conv = rgb24tobgr32; break;
00595         }
00596     }
00597 
00598     return conv;
00599 }
00600 
00601 /* {RGB,BGR}{15,16,24,32,32_1} -> {RGB,BGR}{15,16,24,32} */
00602 static int rgbToRgbWrapper(SwsContext *c, const uint8_t *src[], int srcStride[],
00603                            int srcSliceY, int srcSliceH, uint8_t *dst[],
00604                            int dstStride[])
00605 
00606 {
00607     const enum PixelFormat srcFormat = c->srcFormat;
00608     const enum PixelFormat dstFormat = c->dstFormat;
00609     const int srcBpp = (c->srcFormatBpp + 7) >> 3;
00610     const int dstBpp = (c->dstFormatBpp + 7) >> 3;
00611     rgbConvFn conv = findRgbConvFn(c);
00612 
00613     if (!conv) {
00614         av_log(c, AV_LOG_ERROR, "internal error %s -> %s converter\n",
00615                av_get_pix_fmt_name(srcFormat), av_get_pix_fmt_name(dstFormat));
00616     } else {
00617         const uint8_t *srcPtr = src[0];
00618               uint8_t *dstPtr = dst[0];
00619         if ((srcFormat == PIX_FMT_RGB32_1 || srcFormat == PIX_FMT_BGR32_1) &&
00620             !isRGBA32(dstFormat))
00621             srcPtr += ALT32_CORR;
00622 
00623         if ((dstFormat == PIX_FMT_RGB32_1 || dstFormat == PIX_FMT_BGR32_1) &&
00624             !isRGBA32(srcFormat))
00625             dstPtr += ALT32_CORR;
00626 
00627         if (dstStride[0] * srcBpp == srcStride[0] * dstBpp && srcStride[0] > 0 &&
00628             !(srcStride[0] % srcBpp))
00629             conv(srcPtr, dstPtr + dstStride[0] * srcSliceY,
00630                  srcSliceH * srcStride[0]);
00631         else {
00632             int i;
00633             dstPtr += dstStride[0] * srcSliceY;
00634 
00635             for (i = 0; i < srcSliceH; i++) {
00636                 conv(srcPtr, dstPtr, c->srcW * srcBpp);
00637                 srcPtr += srcStride[0];
00638                 dstPtr += dstStride[0];
00639             }
00640         }
00641     }
00642     return srcSliceH;
00643 }
00644 
00645 static int bgr24ToYv12Wrapper(SwsContext *c, const uint8_t *src[],
00646                               int srcStride[], int srcSliceY, int srcSliceH,
00647                               uint8_t *dst[], int dstStride[])
00648 {
00649     rgb24toyv12(
00650         src[0],
00651         dst[0] +  srcSliceY       * dstStride[0],
00652         dst[1] + (srcSliceY >> 1) * dstStride[1],
00653         dst[2] + (srcSliceY >> 1) * dstStride[2],
00654         c->srcW, srcSliceH,
00655         dstStride[0], dstStride[1], srcStride[0]);
00656     if (dst[3])
00657         fillPlane(dst[3], dstStride[3], c->srcW, srcSliceH, srcSliceY, 255);
00658     return srcSliceH;
00659 }
00660 
00661 static int yvu9ToYv12Wrapper(SwsContext *c, const uint8_t *src[],
00662                              int srcStride[], int srcSliceY, int srcSliceH,
00663                              uint8_t *dst[], int dstStride[])
00664 {
00665     copyPlane(src[0], srcStride[0], srcSliceY, srcSliceH, c->srcW,
00666               dst[0], dstStride[0]);
00667 
00668     planar2x(src[1], dst[1] + dstStride[1] * (srcSliceY >> 1), c->chrSrcW,
00669              srcSliceH >> 2, srcStride[1], dstStride[1]);
00670     planar2x(src[2], dst[2] + dstStride[2] * (srcSliceY >> 1), c->chrSrcW,
00671              srcSliceH >> 2, srcStride[2], dstStride[2]);
00672     if (dst[3])
00673         fillPlane(dst[3], dstStride[3], c->srcW, srcSliceH, srcSliceY, 255);
00674     return srcSliceH;
00675 }
00676 
00677 /* unscaled copy like stuff (assumes nearly identical formats) */
00678 static int packedCopyWrapper(SwsContext *c, const uint8_t *src[],
00679                              int srcStride[], int srcSliceY, int srcSliceH,
00680                              uint8_t *dst[], int dstStride[])
00681 {
00682     if (dstStride[0] == srcStride[0] && srcStride[0] > 0)
00683         memcpy(dst[0] + dstStride[0] * srcSliceY, src[0], srcSliceH * dstStride[0]);
00684     else {
00685         int i;
00686         const uint8_t *srcPtr = src[0];
00687         uint8_t *dstPtr = dst[0] + dstStride[0] * srcSliceY;
00688         int length = 0;
00689 
00690         /* universal length finder */
00691         while (length + c->srcW <= FFABS(dstStride[0]) &&
00692                length + c->srcW <= FFABS(srcStride[0]))
00693             length += c->srcW;
00694         assert(length != 0);
00695 
00696         for (i = 0; i < srcSliceH; i++) {
00697             memcpy(dstPtr, srcPtr, length);
00698             srcPtr += srcStride[0];
00699             dstPtr += dstStride[0];
00700         }
00701     }
00702     return srcSliceH;
00703 }
00704 
00705 #define DITHER_COPY(dst, dstStride, src, srcStride, bswap, dbswap)\
00706     uint16_t scale= dither_scale[dst_depth-1][src_depth-1];\
00707     int shift= src_depth-dst_depth + dither_scale[src_depth-2][dst_depth-1];\
00708     for (i = 0; i < height; i++) {\
00709         const uint8_t *dither= dithers[src_depth-9][i&7];\
00710         for (j = 0; j < length-7; j+=8){\
00711             dst[j+0] = dbswap((bswap(src[j+0]) + dither[0])*scale>>shift);\
00712             dst[j+1] = dbswap((bswap(src[j+1]) + dither[1])*scale>>shift);\
00713             dst[j+2] = dbswap((bswap(src[j+2]) + dither[2])*scale>>shift);\
00714             dst[j+3] = dbswap((bswap(src[j+3]) + dither[3])*scale>>shift);\
00715             dst[j+4] = dbswap((bswap(src[j+4]) + dither[4])*scale>>shift);\
00716             dst[j+5] = dbswap((bswap(src[j+5]) + dither[5])*scale>>shift);\
00717             dst[j+6] = dbswap((bswap(src[j+6]) + dither[6])*scale>>shift);\
00718             dst[j+7] = dbswap((bswap(src[j+7]) + dither[7])*scale>>shift);\
00719         }\
00720         for (; j < length; j++)\
00721             dst[j] = dbswap((bswap(src[j]) + dither[j&7])*scale>>shift);\
00722         dst += dstStride;\
00723         src += srcStride;\
00724     }
00725 
00726 static int planarCopyWrapper(SwsContext *c, const uint8_t *src[],
00727                              int srcStride[], int srcSliceY, int srcSliceH,
00728                              uint8_t *dst[], int dstStride[])
00729 {
00730     int plane, i, j;
00731     for (plane = 0; plane < 4; plane++) {
00732         int length = (plane == 0 || plane == 3) ? c->srcW  : -((-c->srcW  ) >> c->chrDstHSubSample);
00733         int y =      (plane == 0 || plane == 3) ? srcSliceY: -((-srcSliceY) >> c->chrDstVSubSample);
00734         int height = (plane == 0 || plane == 3) ? srcSliceH: -((-srcSliceH) >> c->chrDstVSubSample);
00735         const uint8_t *srcPtr = src[plane];
00736         uint8_t *dstPtr = dst[plane] + dstStride[plane] * y;
00737         int shiftonly= plane==1 || plane==2 || (!c->srcRange && plane==0);
00738 
00739         if (!dst[plane])
00740             continue;
00741         // ignore palette for GRAY8
00742         if (plane == 1 && !dst[2]) continue;
00743         if (!src[plane] || (plane == 1 && !src[2])) {
00744             if (is16BPS(c->dstFormat) || isNBPS(c->dstFormat)) {
00745                 fillPlane16(dst[plane], dstStride[plane], length, height, y,
00746                         plane == 3, av_pix_fmt_descriptors[c->dstFormat].comp[plane].depth_minus1);
00747             } else {
00748                 fillPlane(dst[plane], dstStride[plane], length, height, y,
00749                         (plane == 3) ? 255 : 128);
00750             }
00751         } else {
00752             if(isNBPS(c->srcFormat) || isNBPS(c->dstFormat)
00753                || (is16BPS(c->srcFormat) != is16BPS(c->dstFormat))
00754             ) {
00755                 const int src_depth = av_pix_fmt_descriptors[c->srcFormat].comp[plane].depth_minus1 + 1;
00756                 const int dst_depth = av_pix_fmt_descriptors[c->dstFormat].comp[plane].depth_minus1 + 1;
00757                 const uint16_t *srcPtr2 = (const uint16_t *) srcPtr;
00758                 uint16_t *dstPtr2 = (uint16_t*)dstPtr;
00759 
00760                 if (dst_depth == 8) {
00761                     if(isBE(c->srcFormat) == HAVE_BIGENDIAN){
00762                         DITHER_COPY(dstPtr, dstStride[plane], srcPtr2, srcStride[plane]/2, , )
00763                     } else {
00764                         DITHER_COPY(dstPtr, dstStride[plane], srcPtr2, srcStride[plane]/2, av_bswap16, )
00765                     }
00766                 } else if (src_depth == 8) {
00767                     for (i = 0; i < height; i++) {
00768                         #define COPY816(w)\
00769                         if(shiftonly){\
00770                             for (j = 0; j < length; j++)\
00771                                 w(&dstPtr2[j], srcPtr[j]<<(dst_depth-8));\
00772                         }else{\
00773                             for (j = 0; j < length; j++)\
00774                                 w(&dstPtr2[j], (srcPtr[j]<<(dst_depth-8)) |\
00775                                                (srcPtr[j]>>(2*8-dst_depth)));\
00776                         }
00777                         if(isBE(c->dstFormat)){
00778                             COPY816(AV_WB16)
00779                         } else {
00780                             COPY816(AV_WL16)
00781                         }
00782                         dstPtr2 += dstStride[plane]/2;
00783                         srcPtr  += srcStride[plane];
00784                     }
00785                 } else if (src_depth <= dst_depth) {
00786                     for (i = 0; i < height; i++) {
00787 #define COPY_UP(r,w) \
00788     if(shiftonly){\
00789         for (j = 0; j < length; j++){ \
00790             unsigned int v= r(&srcPtr2[j]);\
00791             w(&dstPtr2[j], v<<(dst_depth-src_depth));\
00792         }\
00793     }else{\
00794         for (j = 0; j < length; j++){ \
00795             unsigned int v= r(&srcPtr2[j]);\
00796             w(&dstPtr2[j], (v<<(dst_depth-src_depth)) | \
00797                         (v>>(2*src_depth-dst_depth)));\
00798         }\
00799     }
00800                         if(isBE(c->srcFormat)){
00801                             if(isBE(c->dstFormat)){
00802                                 COPY_UP(AV_RB16, AV_WB16)
00803                             } else {
00804                                 COPY_UP(AV_RB16, AV_WL16)
00805                             }
00806                         } else {
00807                             if(isBE(c->dstFormat)){
00808                                 COPY_UP(AV_RL16, AV_WB16)
00809                             } else {
00810                                 COPY_UP(AV_RL16, AV_WL16)
00811                             }
00812                         }
00813                         dstPtr2 += dstStride[plane]/2;
00814                         srcPtr2 += srcStride[plane]/2;
00815                     }
00816                 } else {
00817                     if(isBE(c->srcFormat) == HAVE_BIGENDIAN){
00818                         if(isBE(c->dstFormat) == HAVE_BIGENDIAN){
00819                             DITHER_COPY(dstPtr2, dstStride[plane]/2, srcPtr2, srcStride[plane]/2, , )
00820                         } else {
00821                             DITHER_COPY(dstPtr2, dstStride[plane]/2, srcPtr2, srcStride[plane]/2, , av_bswap16)
00822                         }
00823                     }else{
00824                         if(isBE(c->dstFormat) == HAVE_BIGENDIAN){
00825                             DITHER_COPY(dstPtr2, dstStride[plane]/2, srcPtr2, srcStride[plane]/2, av_bswap16, )
00826                         } else {
00827                             DITHER_COPY(dstPtr2, dstStride[plane]/2, srcPtr2, srcStride[plane]/2, av_bswap16, av_bswap16)
00828                         }
00829                     }
00830                 }
00831             } else if (is16BPS(c->srcFormat) && is16BPS(c->dstFormat) &&
00832                       isBE(c->srcFormat) != isBE(c->dstFormat)) {
00833 
00834                 for (i = 0; i < height; i++) {
00835                     for (j = 0; j < length; j++)
00836                         ((uint16_t *) dstPtr)[j] = av_bswap16(((const uint16_t *) srcPtr)[j]);
00837                     srcPtr += srcStride[plane];
00838                     dstPtr += dstStride[plane];
00839                 }
00840             } else if (dstStride[plane] == srcStride[plane] &&
00841                        srcStride[plane] > 0 && srcStride[plane] == length) {
00842                 memcpy(dst[plane] + dstStride[plane] * y, src[plane],
00843                        height * dstStride[plane]);
00844             } else {
00845                 if (is16BPS(c->srcFormat) && is16BPS(c->dstFormat))
00846                     length *= 2;
00847                 else if (!av_pix_fmt_descriptors[c->srcFormat].comp[0].depth_minus1)
00848                     length >>= 3; // monowhite/black
00849                 for (i = 0; i < height; i++) {
00850                     memcpy(dstPtr, srcPtr, length);
00851                     srcPtr += srcStride[plane];
00852                     dstPtr += dstStride[plane];
00853                 }
00854             }
00855         }
00856     }
00857     return srcSliceH;
00858 }
00859 
00860 
00861 #define IS_DIFFERENT_ENDIANESS(src_fmt, dst_fmt, pix_fmt)          \
00862     ((src_fmt == pix_fmt ## BE && dst_fmt == pix_fmt ## LE) ||     \
00863      (src_fmt == pix_fmt ## LE && dst_fmt == pix_fmt ## BE))
00864 
00865 
00866 void ff_get_unscaled_swscale(SwsContext *c)
00867 {
00868     const enum PixelFormat srcFormat = c->srcFormat;
00869     const enum PixelFormat dstFormat = c->dstFormat;
00870     const int flags = c->flags;
00871     const int dstH = c->dstH;
00872     int needsDither;
00873 
00874     needsDither = isAnyRGB(dstFormat) &&
00875             c->dstFormatBpp < 24 &&
00876            (c->dstFormatBpp < c->srcFormatBpp || (!isAnyRGB(srcFormat)));
00877 
00878     /* yv12_to_nv12 */
00879     if ((srcFormat == PIX_FMT_YUV420P || srcFormat == PIX_FMT_YUVA420P) &&
00880         (dstFormat == PIX_FMT_NV12 || dstFormat == PIX_FMT_NV21)) {
00881         c->swScale = planarToNv12Wrapper;
00882     }
00883     /* yuv2bgr */
00884     if ((srcFormat == PIX_FMT_YUV420P || srcFormat == PIX_FMT_YUV422P ||
00885          srcFormat == PIX_FMT_YUVA420P) && isAnyRGB(dstFormat) &&
00886         !(flags & SWS_ACCURATE_RND) && !(dstH & 1)) {
00887         c->swScale = ff_yuv2rgb_get_func_ptr(c);
00888     }
00889 
00890     if (srcFormat == PIX_FMT_YUV410P &&
00891         (dstFormat == PIX_FMT_YUV420P || dstFormat == PIX_FMT_YUVA420P) &&
00892         !(flags & SWS_BITEXACT)) {
00893         c->swScale = yvu9ToYv12Wrapper;
00894     }
00895 
00896     /* bgr24toYV12 */
00897     if (srcFormat == PIX_FMT_BGR24 &&
00898         (dstFormat == PIX_FMT_YUV420P || dstFormat == PIX_FMT_YUVA420P) &&
00899         !(flags & SWS_ACCURATE_RND))
00900         c->swScale = bgr24ToYv12Wrapper;
00901 
00902     /* RGB/BGR -> RGB/BGR (no dither needed forms) */
00903     if (isAnyRGB(srcFormat) && isAnyRGB(dstFormat) && findRgbConvFn(c)
00904         && (!needsDither || (c->flags&(SWS_FAST_BILINEAR|SWS_POINT))))
00905         c->swScale= rgbToRgbWrapper;
00906 
00907 #define isByteRGB(f) (\
00908         f == PIX_FMT_RGB32   ||\
00909         f == PIX_FMT_RGB32_1 ||\
00910         f == PIX_FMT_RGB24   ||\
00911         f == PIX_FMT_BGR32   ||\
00912         f == PIX_FMT_BGR32_1 ||\
00913         f == PIX_FMT_BGR24)
00914 
00915     if (isAnyRGB(srcFormat) && isPlanar(srcFormat) && isByteRGB(dstFormat))
00916         c->swScale = planarRgbToRgbWrapper;
00917 
00918     /* bswap 16 bits per pixel/component packed formats */
00919     if (IS_DIFFERENT_ENDIANESS(srcFormat, dstFormat, PIX_FMT_BGR444) ||
00920         IS_DIFFERENT_ENDIANESS(srcFormat, dstFormat, PIX_FMT_BGR48)  ||
00921         IS_DIFFERENT_ENDIANESS(srcFormat, dstFormat, PIX_FMT_BGR555) ||
00922         IS_DIFFERENT_ENDIANESS(srcFormat, dstFormat, PIX_FMT_BGR565) ||
00923         IS_DIFFERENT_ENDIANESS(srcFormat, dstFormat, PIX_FMT_GRAY16) ||
00924         IS_DIFFERENT_ENDIANESS(srcFormat, dstFormat, PIX_FMT_RGB444) ||
00925         IS_DIFFERENT_ENDIANESS(srcFormat, dstFormat, PIX_FMT_RGB48)  ||
00926         IS_DIFFERENT_ENDIANESS(srcFormat, dstFormat, PIX_FMT_RGB555) ||
00927         IS_DIFFERENT_ENDIANESS(srcFormat, dstFormat, PIX_FMT_RGB565))
00928         c->swScale = packed_16bpc_bswap;
00929 
00930     if (usePal(srcFormat) && isByteRGB(dstFormat))
00931         c->swScale = palToRgbWrapper;
00932 
00933     if (srcFormat == PIX_FMT_YUV422P) {
00934         if (dstFormat == PIX_FMT_YUYV422)
00935             c->swScale = yuv422pToYuy2Wrapper;
00936         else if (dstFormat == PIX_FMT_UYVY422)
00937             c->swScale = yuv422pToUyvyWrapper;
00938     }
00939 
00940     /* LQ converters if -sws 0 or -sws 4*/
00941     if (c->flags&(SWS_FAST_BILINEAR|SWS_POINT)) {
00942         /* yv12_to_yuy2 */
00943         if (srcFormat == PIX_FMT_YUV420P || srcFormat == PIX_FMT_YUVA420P) {
00944             if (dstFormat == PIX_FMT_YUYV422)
00945                 c->swScale = planarToYuy2Wrapper;
00946             else if (dstFormat == PIX_FMT_UYVY422)
00947                 c->swScale = planarToUyvyWrapper;
00948         }
00949     }
00950     if (srcFormat == PIX_FMT_YUYV422 &&
00951        (dstFormat == PIX_FMT_YUV420P || dstFormat == PIX_FMT_YUVA420P))
00952         c->swScale = yuyvToYuv420Wrapper;
00953     if (srcFormat == PIX_FMT_UYVY422 &&
00954        (dstFormat == PIX_FMT_YUV420P || dstFormat == PIX_FMT_YUVA420P))
00955         c->swScale = uyvyToYuv420Wrapper;
00956     if (srcFormat == PIX_FMT_YUYV422 && dstFormat == PIX_FMT_YUV422P)
00957         c->swScale = yuyvToYuv422Wrapper;
00958     if (srcFormat == PIX_FMT_UYVY422 && dstFormat == PIX_FMT_YUV422P)
00959         c->swScale = uyvyToYuv422Wrapper;
00960 
00961 #define isPlanarGray(x) (isGray(x) && (x) != PIX_FMT_GRAY8A)
00962     /* simple copy */
00963     if ( srcFormat == dstFormat ||
00964         (srcFormat == PIX_FMT_YUVA420P && dstFormat == PIX_FMT_YUV420P) ||
00965         (srcFormat == PIX_FMT_YUV420P && dstFormat == PIX_FMT_YUVA420P) ||
00966         (isPlanarYUV(srcFormat) && isPlanarGray(dstFormat)) ||
00967         (isPlanarYUV(dstFormat) && isPlanarGray(srcFormat)) ||
00968         (isPlanarGray(dstFormat) && isPlanarGray(srcFormat)) ||
00969         (isPlanarYUV(srcFormat) && isPlanarYUV(dstFormat) &&
00970          c->chrDstHSubSample == c->chrSrcHSubSample &&
00971          c->chrDstVSubSample == c->chrSrcVSubSample &&
00972          dstFormat != PIX_FMT_NV12 && dstFormat != PIX_FMT_NV21 &&
00973          srcFormat != PIX_FMT_NV12 && srcFormat != PIX_FMT_NV21))
00974     {
00975         if (isPacked(c->srcFormat))
00976             c->swScale = packedCopyWrapper;
00977         else /* Planar YUV or gray */
00978             c->swScale = planarCopyWrapper;
00979     }
00980 
00981     if (ARCH_BFIN)
00982         ff_bfin_get_unscaled_swscale(c);
00983     if (HAVE_ALTIVEC)
00984         ff_swscale_get_unscaled_altivec(c);
00985 }
00986 
00987 static void reset_ptr(const uint8_t *src[], int format)
00988 {
00989     if (!isALPHA(format))
00990         src[3] = NULL;
00991     if (!isPlanar(format)) {
00992         src[3] = src[2] = NULL;
00993 
00994         if (!usePal(format))
00995             src[1] = NULL;
00996     }
00997 }
00998 
00999 static int check_image_pointers(const uint8_t * const data[4], enum PixelFormat pix_fmt,
01000                                 const int linesizes[4])
01001 {
01002     const AVPixFmtDescriptor *desc = &av_pix_fmt_descriptors[pix_fmt];
01003     int i;
01004 
01005     for (i = 0; i < 4; i++) {
01006         int plane = desc->comp[i].plane;
01007         if (!data[plane] || !linesizes[plane])
01008             return 0;
01009     }
01010 
01011     return 1;
01012 }
01013 
01018 int attribute_align_arg sws_scale(struct SwsContext *c,
01019                                   const uint8_t * const srcSlice[],
01020                                   const int srcStride[], int srcSliceY,
01021                                   int srcSliceH, uint8_t *const dst[],
01022                                   const int dstStride[])
01023 {
01024     int i, ret;
01025     const uint8_t *src2[4] = { srcSlice[0], srcSlice[1], srcSlice[2], srcSlice[3] };
01026     uint8_t *dst2[4] = { dst[0], dst[1], dst[2], dst[3] };
01027     uint8_t *rgb0_tmp = NULL;
01028 
01029     // do not mess up sliceDir if we have a "trailing" 0-size slice
01030     if (srcSliceH == 0)
01031         return 0;
01032 
01033     if (!check_image_pointers(srcSlice, c->srcFormat, srcStride)) {
01034         av_log(c, AV_LOG_ERROR, "bad src image pointers\n");
01035         return 0;
01036     }
01037     if (!check_image_pointers((const uint8_t* const*)dst, c->dstFormat, dstStride)) {
01038         av_log(c, AV_LOG_ERROR, "bad dst image pointers\n");
01039         return 0;
01040     }
01041 
01042     if (c->sliceDir == 0 && srcSliceY != 0 && srcSliceY + srcSliceH != c->srcH) {
01043         av_log(c, AV_LOG_ERROR, "Slices start in the middle!\n");
01044         return 0;
01045     }
01046     if (c->sliceDir == 0) {
01047         if (srcSliceY == 0) c->sliceDir = 1; else c->sliceDir = -1;
01048     }
01049 
01050     if (usePal(c->srcFormat)) {
01051         for (i = 0; i < 256; i++) {
01052             int p, r, g, b, y, u, v, a = 0xff;
01053             if (c->srcFormat == PIX_FMT_PAL8) {
01054                 p = ((const uint32_t *)(srcSlice[1]))[i];
01055                 a = (p >> 24) & 0xFF;
01056                 r = (p >> 16) & 0xFF;
01057                 g = (p >>  8) & 0xFF;
01058                 b =  p        & 0xFF;
01059             } else if (c->srcFormat == PIX_FMT_RGB8) {
01060                 r = ( i >> 5     ) * 36;
01061                 g = ((i >> 2) & 7) * 36;
01062                 b = ( i       & 3) * 85;
01063             } else if (c->srcFormat == PIX_FMT_BGR8) {
01064                 b = ( i >> 6     ) * 85;
01065                 g = ((i >> 3) & 7) * 36;
01066                 r = ( i       & 7) * 36;
01067             } else if (c->srcFormat == PIX_FMT_RGB4_BYTE) {
01068                 r = ( i >> 3     ) * 255;
01069                 g = ((i >> 1) & 3) * 85;
01070                 b = ( i       & 1) * 255;
01071             } else if (c->srcFormat == PIX_FMT_GRAY8 || c->srcFormat == PIX_FMT_GRAY8A) {
01072                 r = g = b = i;
01073             } else {
01074                 assert(c->srcFormat == PIX_FMT_BGR4_BYTE);
01075                 b = ( i >> 3     ) * 255;
01076                 g = ((i >> 1) & 3) * 85;
01077                 r = ( i       & 1) * 255;
01078             }
01079             y = av_clip_uint8((RY * r + GY * g + BY * b + ( 33 << (RGB2YUV_SHIFT - 1))) >> RGB2YUV_SHIFT);
01080             u = av_clip_uint8((RU * r + GU * g + BU * b + (257 << (RGB2YUV_SHIFT - 1))) >> RGB2YUV_SHIFT);
01081             v = av_clip_uint8((RV * r + GV * g + BV * b + (257 << (RGB2YUV_SHIFT - 1))) >> RGB2YUV_SHIFT);
01082             c->pal_yuv[i]= y + (u<<8) + (v<<16) + (a<<24);
01083 
01084             switch (c->dstFormat) {
01085             case PIX_FMT_BGR32:
01086 #if !HAVE_BIGENDIAN
01087             case PIX_FMT_RGB24:
01088 #endif
01089                 c->pal_rgb[i]=  r + (g<<8) + (b<<16) + (a<<24);
01090                 break;
01091             case PIX_FMT_BGR32_1:
01092 #if HAVE_BIGENDIAN
01093             case PIX_FMT_BGR24:
01094 #endif
01095                 c->pal_rgb[i]= a + (r<<8) + (g<<16) + (b<<24);
01096                 break;
01097             case PIX_FMT_RGB32_1:
01098 #if HAVE_BIGENDIAN
01099             case PIX_FMT_RGB24:
01100 #endif
01101                 c->pal_rgb[i]= a + (b<<8) + (g<<16) + (r<<24);
01102                 break;
01103             case PIX_FMT_RGB32:
01104 #if !HAVE_BIGENDIAN
01105             case PIX_FMT_BGR24:
01106 #endif
01107             default:
01108                 c->pal_rgb[i]=  b + (g<<8) + (r<<16) + (a<<24);
01109             }
01110         }
01111     }
01112 
01113     if (c->src0Alpha && !c->dst0Alpha && isALPHA(c->dstFormat)) {
01114         uint8_t *base;
01115         int x,y;
01116         rgb0_tmp = av_malloc(FFABS(srcStride[0]) * srcSliceH + 32);
01117         base = srcStride[0] < 0 ? rgb0_tmp - srcStride[0] * (srcSliceH-1) : rgb0_tmp;
01118         for (y=0; y<srcSliceH; y++){
01119             memcpy(base + srcStride[0]*y, src2[0] + srcStride[0]*y, 4*c->srcW);
01120             for (x=c->src0Alpha-1; x<4*c->srcW; x+=4) {
01121                 base[ srcStride[0]*y + x] = 0xFF;
01122             }
01123         }
01124         src2[0] = base;
01125     }
01126 
01127     // copy strides, so they can safely be modified
01128     if (c->sliceDir == 1) {
01129         // slices go from top to bottom
01130         int srcStride2[4] = { srcStride[0], srcStride[1], srcStride[2],
01131                               srcStride[3] };
01132         int dstStride2[4] = { dstStride[0], dstStride[1], dstStride[2],
01133                               dstStride[3] };
01134 
01135         reset_ptr(src2, c->srcFormat);
01136         reset_ptr((void*)dst2, c->dstFormat);
01137 
01138         /* reset slice direction at end of frame */
01139         if (srcSliceY + srcSliceH == c->srcH)
01140             c->sliceDir = 0;
01141 
01142         ret = c->swScale(c, src2, srcStride2, srcSliceY, srcSliceH, dst2,
01143                           dstStride2);
01144     } else {
01145         // slices go from bottom to top => we flip the image internally
01146         int srcStride2[4] = { -srcStride[0], -srcStride[1], -srcStride[2],
01147                               -srcStride[3] };
01148         int dstStride2[4] = { -dstStride[0], -dstStride[1], -dstStride[2],
01149                               -dstStride[3] };
01150 
01151         src2[0] += (srcSliceH - 1) * srcStride[0];
01152         if (!usePal(c->srcFormat))
01153             src2[1] += ((srcSliceH >> c->chrSrcVSubSample) - 1) * srcStride[1];
01154         src2[2] += ((srcSliceH >> c->chrSrcVSubSample) - 1) * srcStride[2];
01155         src2[3] += (srcSliceH - 1) * srcStride[3];
01156         dst2[0] += ( c->dstH                         - 1) * dstStride[0];
01157         dst2[1] += ((c->dstH >> c->chrDstVSubSample) - 1) * dstStride[1];
01158         dst2[2] += ((c->dstH >> c->chrDstVSubSample) - 1) * dstStride[2];
01159         dst2[3] += ( c->dstH                         - 1) * dstStride[3];
01160 
01161         reset_ptr(src2, c->srcFormat);
01162         reset_ptr((void*)dst2, c->dstFormat);
01163 
01164         /* reset slice direction at end of frame */
01165         if (!srcSliceY)
01166             c->sliceDir = 0;
01167 
01168         ret = c->swScale(c, src2, srcStride2, c->srcH-srcSliceY-srcSliceH,
01169                           srcSliceH, dst2, dstStride2);
01170     }
01171 
01172     av_free(rgb0_tmp);
01173     return ret;
01174 }
01175 
01176 /* Convert the palette to the same packed 32-bit format as the palette */
01177 void sws_convertPalette8ToPacked32(const uint8_t *src, uint8_t *dst,
01178                                    int num_pixels, const uint8_t *palette)
01179 {
01180     int i;
01181 
01182     for (i = 0; i < num_pixels; i++)
01183         ((uint32_t *) dst)[i] = ((const uint32_t *) palette)[src[i]];
01184 }
01185 
01186 /* Palette format: ABCD -> dst format: ABC */
01187 void sws_convertPalette8ToPacked24(const uint8_t *src, uint8_t *dst,
01188                                    int num_pixels, const uint8_t *palette)
01189 {
01190     int i;
01191 
01192     for (i = 0; i < num_pixels; i++) {
01193         //FIXME slow?
01194         dst[0] = palette[src[i] * 4 + 0];
01195         dst[1] = palette[src[i] * 4 + 1];
01196         dst[2] = palette[src[i] * 4 + 2];
01197         dst += 3;
01198     }
01199 }