libswscale/swscale_unscaled.c
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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 static void fillPlane(uint8_t *plane, int stride, int width, int height, int y,
00049                       uint8_t val)
00050 {
00051     int i;
00052     uint8_t *ptr = plane + stride * y;
00053     for (i = 0; i < height; i++) {
00054         memset(ptr, val, width);
00055         ptr += stride;
00056     }
00057 }
00058 
00059 static void fillPlane16(uint8_t *plane, int stride, int width, int height, int y,
00060                       int alpha, int bits)
00061 {
00062     int i, j;
00063     uint8_t *ptr = plane + stride * y;
00064     int v = alpha ? -1 : (1<<bits);
00065     for (i = 0; i < height; i++) {
00066         for (j = 0; j < width; j++) {
00067             AV_WN16(ptr+2*j, v);
00068         }
00069         ptr += stride;
00070     }
00071 }
00072 
00073 static void copyPlane(const uint8_t *src, int srcStride,
00074                       int srcSliceY, int srcSliceH, int width,
00075                       uint8_t *dst, int dstStride)
00076 {
00077     dst += dstStride * srcSliceY;
00078     if (dstStride == srcStride && srcStride > 0) {
00079         memcpy(dst, src, srcSliceH * dstStride);
00080     } else {
00081         int i;
00082         for (i = 0; i < srcSliceH; i++) {
00083             memcpy(dst, src, width);
00084             src += srcStride;
00085             dst += dstStride;
00086         }
00087     }
00088 }
00089 
00090 static int planarToNv12Wrapper(SwsContext *c, const uint8_t *src[],
00091                                int srcStride[], int srcSliceY,
00092                                int srcSliceH, uint8_t *dstParam[],
00093                                int dstStride[])
00094 {
00095     uint8_t *dst = dstParam[1] + dstStride[1] * srcSliceY / 2;
00096 
00097     copyPlane(src[0], srcStride[0], srcSliceY, srcSliceH, c->srcW,
00098               dstParam[0], dstStride[0]);
00099 
00100     if (c->dstFormat == PIX_FMT_NV12)
00101         interleaveBytes(src[1], src[2], dst, c->srcW / 2, srcSliceH / 2,
00102                         srcStride[1], srcStride[2], dstStride[0]);
00103     else
00104         interleaveBytes(src[2], src[1], dst, c->srcW / 2, srcSliceH / 2,
00105                         srcStride[2], srcStride[1], dstStride[0]);
00106 
00107     return srcSliceH;
00108 }
00109 
00110 static int planarToYuy2Wrapper(SwsContext *c, const uint8_t *src[],
00111                                int srcStride[], int srcSliceY, int srcSliceH,
00112                                uint8_t *dstParam[], int dstStride[])
00113 {
00114     uint8_t *dst = dstParam[0] + dstStride[0] * srcSliceY;
00115 
00116     yv12toyuy2(src[0], src[1], src[2], dst, c->srcW, srcSliceH, srcStride[0],
00117                srcStride[1], dstStride[0]);
00118 
00119     return srcSliceH;
00120 }
00121 
00122 static int planarToUyvyWrapper(SwsContext *c, const uint8_t *src[],
00123                                int srcStride[], int srcSliceY, int srcSliceH,
00124                                uint8_t *dstParam[], int dstStride[])
00125 {
00126     uint8_t *dst = dstParam[0] + dstStride[0] * srcSliceY;
00127 
00128     yv12touyvy(src[0], src[1], src[2], dst, c->srcW, srcSliceH, srcStride[0],
00129                srcStride[1], dstStride[0]);
00130 
00131     return srcSliceH;
00132 }
00133 
00134 static int yuv422pToYuy2Wrapper(SwsContext *c, const uint8_t *src[],
00135                                 int srcStride[], int srcSliceY, int srcSliceH,
00136                                 uint8_t *dstParam[], int dstStride[])
00137 {
00138     uint8_t *dst = dstParam[0] + dstStride[0] * srcSliceY;
00139 
00140     yuv422ptoyuy2(src[0], src[1], src[2], dst, c->srcW, srcSliceH, srcStride[0],
00141                   srcStride[1], dstStride[0]);
00142 
00143     return srcSliceH;
00144 }
00145 
00146 static int yuv422pToUyvyWrapper(SwsContext *c, const uint8_t *src[],
00147                                 int srcStride[], int srcSliceY, int srcSliceH,
00148                                 uint8_t *dstParam[], int dstStride[])
00149 {
00150     uint8_t *dst = dstParam[0] + dstStride[0] * srcSliceY;
00151 
00152     yuv422ptouyvy(src[0], src[1], src[2], dst, c->srcW, srcSliceH, srcStride[0],
00153                   srcStride[1], dstStride[0]);
00154 
00155     return srcSliceH;
00156 }
00157 
00158 static int yuyvToYuv420Wrapper(SwsContext *c, const uint8_t *src[],
00159                                int srcStride[], int srcSliceY, int srcSliceH,
00160                                uint8_t *dstParam[], int dstStride[])
00161 {
00162     uint8_t *ydst = dstParam[0] + dstStride[0] * srcSliceY;
00163     uint8_t *udst = dstParam[1] + dstStride[1] * srcSliceY / 2;
00164     uint8_t *vdst = dstParam[2] + dstStride[2] * srcSliceY / 2;
00165 
00166     yuyvtoyuv420(ydst, udst, vdst, src[0], c->srcW, srcSliceH, dstStride[0],
00167                  dstStride[1], srcStride[0]);
00168 
00169     if (dstParam[3])
00170         fillPlane(dstParam[3], dstStride[3], c->srcW, srcSliceH, srcSliceY, 255);
00171 
00172     return srcSliceH;
00173 }
00174 
00175 static int yuyvToYuv422Wrapper(SwsContext *c, const uint8_t *src[],
00176                                int srcStride[], int srcSliceY, int srcSliceH,
00177                                uint8_t *dstParam[], int dstStride[])
00178 {
00179     uint8_t *ydst = dstParam[0] + dstStride[0] * srcSliceY;
00180     uint8_t *udst = dstParam[1] + dstStride[1] * srcSliceY;
00181     uint8_t *vdst = dstParam[2] + dstStride[2] * srcSliceY;
00182 
00183     yuyvtoyuv422(ydst, udst, vdst, src[0], c->srcW, srcSliceH, dstStride[0],
00184                  dstStride[1], srcStride[0]);
00185 
00186     return srcSliceH;
00187 }
00188 
00189 static int uyvyToYuv420Wrapper(SwsContext *c, const uint8_t *src[],
00190                                int srcStride[], int srcSliceY, int srcSliceH,
00191                                uint8_t *dstParam[], int dstStride[])
00192 {
00193     uint8_t *ydst = dstParam[0] + dstStride[0] * srcSliceY;
00194     uint8_t *udst = dstParam[1] + dstStride[1] * srcSliceY / 2;
00195     uint8_t *vdst = dstParam[2] + dstStride[2] * srcSliceY / 2;
00196 
00197     uyvytoyuv420(ydst, udst, vdst, src[0], c->srcW, srcSliceH, dstStride[0],
00198                  dstStride[1], srcStride[0]);
00199 
00200     if (dstParam[3])
00201         fillPlane(dstParam[3], dstStride[3], c->srcW, srcSliceH, srcSliceY, 255);
00202 
00203     return srcSliceH;
00204 }
00205 
00206 static int uyvyToYuv422Wrapper(SwsContext *c, const uint8_t *src[],
00207                                int srcStride[], int srcSliceY, int srcSliceH,
00208                                uint8_t *dstParam[], int dstStride[])
00209 {
00210     uint8_t *ydst = dstParam[0] + dstStride[0] * srcSliceY;
00211     uint8_t *udst = dstParam[1] + dstStride[1] * srcSliceY;
00212     uint8_t *vdst = dstParam[2] + dstStride[2] * srcSliceY;
00213 
00214     uyvytoyuv422(ydst, udst, vdst, src[0], c->srcW, srcSliceH, dstStride[0],
00215                  dstStride[1], srcStride[0]);
00216 
00217     return srcSliceH;
00218 }
00219 
00220 static void gray8aToPacked32(const uint8_t *src, uint8_t *dst, int num_pixels,
00221                              const uint8_t *palette)
00222 {
00223     int i;
00224     for (i = 0; i < num_pixels; i++)
00225         ((uint32_t *) dst)[i] = ((const uint32_t *) palette)[src[i << 1]] | (src[(i << 1) + 1] << 24);
00226 }
00227 
00228 static void gray8aToPacked32_1(const uint8_t *src, uint8_t *dst, int num_pixels,
00229                                const uint8_t *palette)
00230 {
00231     int i;
00232 
00233     for (i = 0; i < num_pixels; i++)
00234         ((uint32_t *) dst)[i] = ((const uint32_t *) palette)[src[i << 1]] | src[(i << 1) + 1];
00235 }
00236 
00237 static void gray8aToPacked24(const uint8_t *src, uint8_t *dst, int num_pixels,
00238                              const uint8_t *palette)
00239 {
00240     int i;
00241 
00242     for (i = 0; i < num_pixels; i++) {
00243         //FIXME slow?
00244         dst[0] = palette[src[i << 1] * 4 + 0];
00245         dst[1] = palette[src[i << 1] * 4 + 1];
00246         dst[2] = palette[src[i << 1] * 4 + 2];
00247         dst += 3;
00248     }
00249 }
00250 
00251 static int packed_16bpc_bswap(SwsContext *c, const uint8_t *src[],
00252                               int srcStride[], int srcSliceY, int srcSliceH,
00253                               uint8_t *dst[], int dstStride[])
00254 {
00255     int i, j;
00256     int srcstr = srcStride[0] >> 1;
00257     int dststr = dstStride[0] >> 1;
00258     uint16_t       *dstPtr =       (uint16_t *) dst[0];
00259     const uint16_t *srcPtr = (const uint16_t *) src[0];
00260     int min_stride         = FFMIN(srcstr, dststr);
00261 
00262     for (i = 0; i < srcSliceH; i++) {
00263         for (j = 0; j < min_stride; j++) {
00264             dstPtr[j] = av_bswap16(srcPtr[j]);
00265         }
00266         srcPtr += srcstr;
00267         dstPtr += dststr;
00268     }
00269 
00270     return srcSliceH;
00271 }
00272 
00273 static int palToRgbWrapper(SwsContext *c, const uint8_t *src[], int srcStride[],
00274                            int srcSliceY, int srcSliceH, uint8_t *dst[],
00275                            int dstStride[])
00276 {
00277     const enum PixelFormat srcFormat = c->srcFormat;
00278     const enum PixelFormat dstFormat = c->dstFormat;
00279     void (*conv)(const uint8_t *src, uint8_t *dst, int num_pixels,
00280                  const uint8_t *palette) = NULL;
00281     int i;
00282     uint8_t *dstPtr = dst[0] + dstStride[0] * srcSliceY;
00283     const uint8_t *srcPtr = src[0];
00284 
00285     if (srcFormat == PIX_FMT_GRAY8A) {
00286         switch (dstFormat) {
00287         case PIX_FMT_RGB32  : conv = gray8aToPacked32; break;
00288         case PIX_FMT_BGR32  : conv = gray8aToPacked32; break;
00289         case PIX_FMT_BGR32_1: conv = gray8aToPacked32_1; break;
00290         case PIX_FMT_RGB32_1: conv = gray8aToPacked32_1; break;
00291         case PIX_FMT_RGB24  : conv = gray8aToPacked24; break;
00292         case PIX_FMT_BGR24  : conv = gray8aToPacked24; break;
00293         }
00294     } else if (usePal(srcFormat)) {
00295         switch (dstFormat) {
00296         case PIX_FMT_RGB32  : conv = sws_convertPalette8ToPacked32; break;
00297         case PIX_FMT_BGR32  : conv = sws_convertPalette8ToPacked32; break;
00298         case PIX_FMT_BGR32_1: conv = sws_convertPalette8ToPacked32; break;
00299         case PIX_FMT_RGB32_1: conv = sws_convertPalette8ToPacked32; break;
00300         case PIX_FMT_RGB24  : conv = sws_convertPalette8ToPacked24; break;
00301         case PIX_FMT_BGR24  : conv = sws_convertPalette8ToPacked24; break;
00302         }
00303     }
00304 
00305     if (!conv)
00306         av_log(c, AV_LOG_ERROR, "internal error %s -> %s converter\n",
00307                av_get_pix_fmt_name(srcFormat), av_get_pix_fmt_name(dstFormat));
00308     else {
00309         for (i = 0; i < srcSliceH; i++) {
00310             conv(srcPtr, dstPtr, c->srcW, (uint8_t *) c->pal_rgb);
00311             srcPtr += srcStride[0];
00312             dstPtr += dstStride[0];
00313         }
00314     }
00315 
00316     return srcSliceH;
00317 }
00318 
00319 static void gbr24ptopacked24(const uint8_t* src[], int srcStride[], uint8_t* dst, int dstStride, int srcSliceH, int width)
00320 {
00321     int x, h, i;
00322     for (h = 0; h < srcSliceH; h++) {
00323         uint8_t *dest = dst + dstStride * h;
00324         for (x = 0; x < width; x++) {
00325             *dest++ = src[0][x];
00326             *dest++ = src[1][x];
00327             *dest++ = src[2][x];
00328         }
00329 
00330         for (i = 0; i < 3; i++)
00331             src[i] += srcStride[i];
00332     }
00333 }
00334 
00335 static void gbr24ptopacked32(const uint8_t* src[], int srcStride[], uint8_t* dst, int dstStride, int srcSliceH, int alpha_first, int width)
00336 {
00337     int x, h, i;
00338     for (h = 0; h < srcSliceH; h++) {
00339         uint8_t *dest = dst + dstStride * h;
00340 
00341         if (alpha_first) {
00342             for (x = 0; x < width; x++) {
00343                 *dest++ = 0xff;
00344                 *dest++ = src[0][x];
00345                 *dest++ = src[1][x];
00346                 *dest++ = src[2][x];
00347             }
00348         } else {
00349             for (x = 0; x < width; x++) {
00350                 *dest++ = src[0][x];
00351                 *dest++ = src[1][x];
00352                 *dest++ = src[2][x];
00353                 *dest++ = 0xff;
00354             }
00355         }
00356 
00357         for (i = 0; i < 3; i++)
00358             src[i] += srcStride[i];
00359     }
00360 }
00361 
00362 static int planarRgbToRgbWrapper(SwsContext *c, const uint8_t* src[], int srcStride[], int srcSliceY,
00363         int srcSliceH, uint8_t* dst[], int dstStride[])
00364 {
00365     int alpha_first = 0;
00366     if (c->srcFormat != PIX_FMT_GBR24P) {
00367         av_log(c, AV_LOG_ERROR, "unsupported planar RGB conversion %s -> %s\n",
00368               av_get_pix_fmt_name(c->srcFormat), av_get_pix_fmt_name(c->dstFormat));
00369         return srcSliceH;
00370     }
00371 
00372     switch (c->dstFormat) {
00373         case PIX_FMT_BGR24:
00374             gbr24ptopacked24((const uint8_t* []) {src[1], src[0], src[2]}, (int []) {srcStride[1], srcStride[0], srcStride[2]},
00375                   dst[0] + srcSliceY * dstStride[0], dstStride[0], srcSliceH, c->srcW);
00376             break;
00377 
00378         case PIX_FMT_RGB24:
00379             gbr24ptopacked24((const uint8_t* []) {src[2], src[0], src[1]}, (int []) {srcStride[2], srcStride[0], srcStride[1]},
00380                   dst[0] + srcSliceY * dstStride[0], dstStride[0], srcSliceH, c->srcW);
00381             break;
00382 
00383         case PIX_FMT_ARGB:
00384             alpha_first = 1;
00385         case PIX_FMT_RGBA:
00386             gbr24ptopacked32((const uint8_t* []) {src[2], src[0], src[1]}, (int []) {srcStride[2], srcStride[0], srcStride[1]},
00387                   dst[0] + srcSliceY * dstStride[0], dstStride[0], srcSliceH, alpha_first, c->srcW);
00388             break;
00389 
00390         case PIX_FMT_ABGR:
00391             alpha_first = 1;
00392         case PIX_FMT_BGRA:
00393             gbr24ptopacked32((const uint8_t* []) {src[1], src[0], src[2]}, (int []) {srcStride[1], srcStride[0], srcStride[2]},
00394                   dst[0] + srcSliceY * dstStride[0], dstStride[0], srcSliceH, alpha_first, c->srcW);
00395             break;
00396 
00397         default:
00398             av_log(c, AV_LOG_ERROR, "unsupported planar RGB conversion %s -> %s\n",
00399                     av_get_pix_fmt_name(c->srcFormat), av_get_pix_fmt_name(c->dstFormat));
00400     }
00401 
00402     return srcSliceH;
00403 }
00404 
00405 #define isRGBA32(x) (            \
00406            (x) == PIX_FMT_ARGB   \
00407         || (x) == PIX_FMT_RGBA   \
00408         || (x) == PIX_FMT_BGRA   \
00409         || (x) == PIX_FMT_ABGR   \
00410         )
00411 
00412 /* {RGB,BGR}{15,16,24,32,32_1} -> {RGB,BGR}{15,16,24,32} */
00413 typedef void (* rgbConvFn) (const uint8_t *, uint8_t *, int);
00414 static rgbConvFn findRgbConvFn(SwsContext *c)
00415 {
00416     const enum PixelFormat srcFormat = c->srcFormat;
00417     const enum PixelFormat dstFormat = c->dstFormat;
00418     const int srcId = c->srcFormatBpp;
00419     const int dstId = c->dstFormatBpp;
00420     rgbConvFn conv = NULL;
00421 
00422 #define IS_NOT_NE(bpp, fmt) \
00423     (((bpp + 7) >> 3) == 2 && \
00424      (!(av_pix_fmt_descriptors[fmt].flags & PIX_FMT_BE) != !HAVE_BIGENDIAN))
00425 
00426     /* if this is non-native rgb444/555/565, don't handle it here. */
00427     if (IS_NOT_NE(srcId, srcFormat) || IS_NOT_NE(dstId, dstFormat))
00428         return NULL;
00429 
00430 #define CONV_IS(src, dst) (srcFormat == PIX_FMT_##src && dstFormat == PIX_FMT_##dst)
00431 
00432     if (isRGBA32(srcFormat) && isRGBA32(dstFormat)) {
00433         if (     CONV_IS(ABGR, RGBA)
00434               || CONV_IS(ARGB, BGRA)
00435               || CONV_IS(BGRA, ARGB)
00436               || CONV_IS(RGBA, ABGR)) conv = shuffle_bytes_3210;
00437         else if (CONV_IS(ABGR, ARGB)
00438               || CONV_IS(ARGB, ABGR)) conv = shuffle_bytes_0321;
00439         else if (CONV_IS(ABGR, BGRA)
00440               || CONV_IS(ARGB, RGBA)) conv = shuffle_bytes_1230;
00441         else if (CONV_IS(BGRA, RGBA)
00442               || CONV_IS(RGBA, BGRA)) conv = shuffle_bytes_2103;
00443         else if (CONV_IS(BGRA, ABGR)
00444               || CONV_IS(RGBA, ARGB)) conv = shuffle_bytes_3012;
00445     } else
00446     /* BGR -> BGR */
00447     if ((isBGRinInt(srcFormat) && isBGRinInt(dstFormat)) ||
00448         (isRGBinInt(srcFormat) && isRGBinInt(dstFormat))) {
00449         switch (srcId | (dstId << 16)) {
00450         case 0x000F000C: conv = rgb12to15; break;
00451         case 0x000F0010: conv = rgb16to15; break;
00452         case 0x000F0018: conv = rgb24to15; break;
00453         case 0x000F0020: conv = rgb32to15; break;
00454         case 0x0010000F: conv = rgb15to16; break;
00455         case 0x00100018: conv = rgb24to16; break;
00456         case 0x00100020: conv = rgb32to16; break;
00457         case 0x0018000F: conv = rgb15to24; break;
00458         case 0x00180010: conv = rgb16to24; break;
00459         case 0x00180020: conv = rgb32to24; break;
00460         case 0x0020000F: conv = rgb15to32; break;
00461         case 0x00200010: conv = rgb16to32; break;
00462         case 0x00200018: conv = rgb24to32; break;
00463         }
00464     } else if ((isBGRinInt(srcFormat) && isRGBinInt(dstFormat)) ||
00465                (isRGBinInt(srcFormat) && isBGRinInt(dstFormat))) {
00466         switch (srcId | (dstId << 16)) {
00467         case 0x000C000C: conv = rgb12tobgr12; break;
00468         case 0x000F000F: conv = rgb15tobgr15; break;
00469         case 0x000F0010: conv = rgb16tobgr15; break;
00470         case 0x000F0018: conv = rgb24tobgr15; break;
00471         case 0x000F0020: conv = rgb32tobgr15; break;
00472         case 0x0010000F: conv = rgb15tobgr16; break;
00473         case 0x00100010: conv = rgb16tobgr16; break;
00474         case 0x00100018: conv = rgb24tobgr16; break;
00475         case 0x00100020: conv = rgb32tobgr16; break;
00476         case 0x0018000F: conv = rgb15tobgr24; break;
00477         case 0x00180010: conv = rgb16tobgr24; break;
00478         case 0x00180018: conv = rgb24tobgr24; break;
00479         case 0x00180020: conv = rgb32tobgr24; break;
00480         case 0x0020000F: conv = rgb15tobgr32; break;
00481         case 0x00200010: conv = rgb16tobgr32; break;
00482         case 0x00200018: conv = rgb24tobgr32; break;
00483         }
00484     }
00485 
00486     return conv;
00487 }
00488 
00489 /* {RGB,BGR}{15,16,24,32,32_1} -> {RGB,BGR}{15,16,24,32} */
00490 static int rgbToRgbWrapper(SwsContext *c, const uint8_t *src[], int srcStride[],
00491                            int srcSliceY, int srcSliceH, uint8_t *dst[],
00492                            int dstStride[])
00493 
00494 {
00495     const enum PixelFormat srcFormat = c->srcFormat;
00496     const enum PixelFormat dstFormat = c->dstFormat;
00497     const int srcBpp = (c->srcFormatBpp + 7) >> 3;
00498     const int dstBpp = (c->dstFormatBpp + 7) >> 3;
00499     rgbConvFn conv = findRgbConvFn(c);
00500 
00501     if (!conv) {
00502         av_log(c, AV_LOG_ERROR, "internal error %s -> %s converter\n",
00503                av_get_pix_fmt_name(srcFormat), av_get_pix_fmt_name(dstFormat));
00504     } else {
00505         const uint8_t *srcPtr = src[0];
00506               uint8_t *dstPtr = dst[0];
00507         if ((srcFormat == PIX_FMT_RGB32_1 || srcFormat == PIX_FMT_BGR32_1) &&
00508             !isRGBA32(dstFormat))
00509             srcPtr += ALT32_CORR;
00510 
00511         if ((dstFormat == PIX_FMT_RGB32_1 || dstFormat == PIX_FMT_BGR32_1) &&
00512             !isRGBA32(srcFormat))
00513             dstPtr += ALT32_CORR;
00514 
00515         if (dstStride[0] * srcBpp == srcStride[0] * dstBpp && srcStride[0] > 0 &&
00516             !(srcStride[0] % srcBpp))
00517             conv(srcPtr, dstPtr + dstStride[0] * srcSliceY,
00518                  srcSliceH * srcStride[0]);
00519         else {
00520             int i;
00521             dstPtr += dstStride[0] * srcSliceY;
00522 
00523             for (i = 0; i < srcSliceH; i++) {
00524                 conv(srcPtr, dstPtr, c->srcW * srcBpp);
00525                 srcPtr += srcStride[0];
00526                 dstPtr += dstStride[0];
00527             }
00528         }
00529     }
00530     return srcSliceH;
00531 }
00532 
00533 static int bgr24ToYv12Wrapper(SwsContext *c, const uint8_t *src[],
00534                               int srcStride[], int srcSliceY, int srcSliceH,
00535                               uint8_t *dst[], int dstStride[])
00536 {
00537     rgb24toyv12(
00538         src[0],
00539         dst[0] +  srcSliceY       * dstStride[0],
00540         dst[1] + (srcSliceY >> 1) * dstStride[1],
00541         dst[2] + (srcSliceY >> 1) * dstStride[2],
00542         c->srcW, srcSliceH,
00543         dstStride[0], dstStride[1], srcStride[0]);
00544     if (dst[3])
00545         fillPlane(dst[3], dstStride[3], c->srcW, srcSliceH, srcSliceY, 255);
00546     return srcSliceH;
00547 }
00548 
00549 static int yvu9ToYv12Wrapper(SwsContext *c, const uint8_t *src[],
00550                              int srcStride[], int srcSliceY, int srcSliceH,
00551                              uint8_t *dst[], int dstStride[])
00552 {
00553     copyPlane(src[0], srcStride[0], srcSliceY, srcSliceH, c->srcW,
00554               dst[0], dstStride[0]);
00555 
00556     planar2x(src[1], dst[1] + dstStride[1] * (srcSliceY >> 1), c->chrSrcW,
00557              srcSliceH >> 2, srcStride[1], dstStride[1]);
00558     planar2x(src[2], dst[2] + dstStride[2] * (srcSliceY >> 1), c->chrSrcW,
00559              srcSliceH >> 2, srcStride[2], dstStride[2]);
00560     if (dst[3])
00561         fillPlane(dst[3], dstStride[3], c->srcW, srcSliceH, srcSliceY, 255);
00562     return srcSliceH;
00563 }
00564 
00565 /* unscaled copy like stuff (assumes nearly identical formats) */
00566 static int packedCopyWrapper(SwsContext *c, const uint8_t *src[],
00567                              int srcStride[], int srcSliceY, int srcSliceH,
00568                              uint8_t *dst[], int dstStride[])
00569 {
00570     if (dstStride[0] == srcStride[0] && srcStride[0] > 0)
00571         memcpy(dst[0] + dstStride[0] * srcSliceY, src[0], srcSliceH * dstStride[0]);
00572     else {
00573         int i;
00574         const uint8_t *srcPtr = src[0];
00575         uint8_t *dstPtr = dst[0] + dstStride[0] * srcSliceY;
00576         int length = 0;
00577 
00578         /* universal length finder */
00579         while (length + c->srcW <= FFABS(dstStride[0]) &&
00580                length + c->srcW <= FFABS(srcStride[0]))
00581             length += c->srcW;
00582         assert(length != 0);
00583 
00584         for (i = 0; i < srcSliceH; i++) {
00585             memcpy(dstPtr, srcPtr, length);
00586             srcPtr += srcStride[0];
00587             dstPtr += dstStride[0];
00588         }
00589     }
00590     return srcSliceH;
00591 }
00592 
00593 #define DITHER_COPY(dst, dstStride, src, srcStride, bswap, dbswap)\
00594     uint16_t scale= dither_scale[dst_depth-1][src_depth-1];\
00595     int shift= src_depth-dst_depth + dither_scale[src_depth-2][dst_depth-1];\
00596     for (i = 0; i < height; i++) {\
00597         const uint8_t *dither= dithers[src_depth-9][i&7];\
00598         for (j = 0; j < length-7; j+=8){\
00599             dst[j+0] = dbswap((bswap(src[j+0]) + dither[0])*scale>>shift);\
00600             dst[j+1] = dbswap((bswap(src[j+1]) + dither[1])*scale>>shift);\
00601             dst[j+2] = dbswap((bswap(src[j+2]) + dither[2])*scale>>shift);\
00602             dst[j+3] = dbswap((bswap(src[j+3]) + dither[3])*scale>>shift);\
00603             dst[j+4] = dbswap((bswap(src[j+4]) + dither[4])*scale>>shift);\
00604             dst[j+5] = dbswap((bswap(src[j+5]) + dither[5])*scale>>shift);\
00605             dst[j+6] = dbswap((bswap(src[j+6]) + dither[6])*scale>>shift);\
00606             dst[j+7] = dbswap((bswap(src[j+7]) + dither[7])*scale>>shift);\
00607         }\
00608         for (; j < length; j++)\
00609             dst[j] = dbswap((bswap(src[j]) + dither[j&7])*scale>>shift);\
00610         dst += dstStride;\
00611         src += srcStride;\
00612     }
00613 
00614 static int planarCopyWrapper(SwsContext *c, const uint8_t *src[],
00615                              int srcStride[], int srcSliceY, int srcSliceH,
00616                              uint8_t *dst[], int dstStride[])
00617 {
00618     int plane, i, j;
00619     for (plane = 0; plane < 4; plane++) {
00620         int length = (plane == 0 || plane == 3) ? c->srcW  : -((-c->srcW  ) >> c->chrDstHSubSample);
00621         int y =      (plane == 0 || plane == 3) ? srcSliceY: -((-srcSliceY) >> c->chrDstVSubSample);
00622         int height = (plane == 0 || plane == 3) ? srcSliceH: -((-srcSliceH) >> c->chrDstVSubSample);
00623         const uint8_t *srcPtr = src[plane];
00624         uint8_t *dstPtr = dst[plane] + dstStride[plane] * y;
00625         int shiftonly= plane==1 || plane==2 || (!c->srcRange && plane==0);
00626 
00627         if (!dst[plane])
00628             continue;
00629         // ignore palette for GRAY8
00630         if (plane == 1 && !dst[2]) continue;
00631         if (!src[plane] || (plane == 1 && !src[2])) {
00632             if (is16BPS(c->dstFormat) || isNBPS(c->dstFormat)) {
00633                 fillPlane16(dst[plane], dstStride[plane], length, height, y,
00634                         plane == 3, av_pix_fmt_descriptors[c->dstFormat].comp[plane].depth_minus1);
00635             } else {
00636                 fillPlane(dst[plane], dstStride[plane], length, height, y,
00637                         (plane == 3) ? 255 : 128);
00638             }
00639         } else {
00640             if(isNBPS(c->srcFormat) || isNBPS(c->dstFormat)
00641                || (is16BPS(c->srcFormat) != is16BPS(c->dstFormat))
00642             ) {
00643                 const int src_depth = av_pix_fmt_descriptors[c->srcFormat].comp[plane].depth_minus1 + 1;
00644                 const int dst_depth = av_pix_fmt_descriptors[c->dstFormat].comp[plane].depth_minus1 + 1;
00645                 const uint16_t *srcPtr2 = (const uint16_t *) srcPtr;
00646                 uint16_t *dstPtr2 = (uint16_t*)dstPtr;
00647 
00648                 if (dst_depth == 8) {
00649                     if(isBE(c->srcFormat) == HAVE_BIGENDIAN){
00650                         DITHER_COPY(dstPtr, dstStride[plane], srcPtr2, srcStride[plane]/2, , )
00651                     } else {
00652                         DITHER_COPY(dstPtr, dstStride[plane], srcPtr2, srcStride[plane]/2, av_bswap16, )
00653                     }
00654                 } else if (src_depth == 8) {
00655                     for (i = 0; i < height; i++) {
00656                         #define COPY816(w)\
00657                         if(shiftonly){\
00658                             for (j = 0; j < length; j++)\
00659                                 w(&dstPtr2[j], srcPtr[j]<<(dst_depth-8));\
00660                         }else{\
00661                             for (j = 0; j < length; j++)\
00662                                 w(&dstPtr2[j], (srcPtr[j]<<(dst_depth-8)) |\
00663                                                (srcPtr[j]>>(2*8-dst_depth)));\
00664                         }
00665                         if(isBE(c->dstFormat)){
00666                             COPY816(AV_WB16)
00667                         } else {
00668                             COPY816(AV_WL16)
00669                         }
00670                         dstPtr2 += dstStride[plane]/2;
00671                         srcPtr  += srcStride[plane];
00672                     }
00673                 } else if (src_depth <= dst_depth) {
00674                     for (i = 0; i < height; i++) {
00675 #define COPY_UP(r,w) \
00676     if(shiftonly){\
00677         for (j = 0; j < length; j++){ \
00678             unsigned int v= r(&srcPtr2[j]);\
00679             w(&dstPtr2[j], v<<(dst_depth-src_depth));\
00680         }\
00681     }else{\
00682         for (j = 0; j < length; j++){ \
00683             unsigned int v= r(&srcPtr2[j]);\
00684             w(&dstPtr2[j], (v<<(dst_depth-src_depth)) | \
00685                         (v>>(2*src_depth-dst_depth)));\
00686         }\
00687     }
00688                         if(isBE(c->srcFormat)){
00689                             if(isBE(c->dstFormat)){
00690                                 COPY_UP(AV_RB16, AV_WB16)
00691                             } else {
00692                                 COPY_UP(AV_RB16, AV_WL16)
00693                             }
00694                         } else {
00695                             if(isBE(c->dstFormat)){
00696                                 COPY_UP(AV_RL16, AV_WB16)
00697                             } else {
00698                                 COPY_UP(AV_RL16, AV_WL16)
00699                             }
00700                         }
00701                         dstPtr2 += dstStride[plane]/2;
00702                         srcPtr2 += srcStride[plane]/2;
00703                     }
00704                 } else {
00705                     if(isBE(c->srcFormat) == HAVE_BIGENDIAN){
00706                         if(isBE(c->dstFormat) == HAVE_BIGENDIAN){
00707                             DITHER_COPY(dstPtr2, dstStride[plane]/2, srcPtr2, srcStride[plane]/2, , )
00708                         } else {
00709                             DITHER_COPY(dstPtr2, dstStride[plane]/2, srcPtr2, srcStride[plane]/2, , av_bswap16)
00710                         }
00711                     }else{
00712                         if(isBE(c->dstFormat) == HAVE_BIGENDIAN){
00713                             DITHER_COPY(dstPtr2, dstStride[plane]/2, srcPtr2, srcStride[plane]/2, av_bswap16, )
00714                         } else {
00715                             DITHER_COPY(dstPtr2, dstStride[plane]/2, srcPtr2, srcStride[plane]/2, av_bswap16, av_bswap16)
00716                         }
00717                     }
00718                 }
00719             } else if (is16BPS(c->srcFormat) && is16BPS(c->dstFormat) &&
00720                       isBE(c->srcFormat) != isBE(c->dstFormat)) {
00721 
00722                 for (i = 0; i < height; i++) {
00723                     for (j = 0; j < length; j++)
00724                         ((uint16_t *) dstPtr)[j] = av_bswap16(((const uint16_t *) srcPtr)[j]);
00725                     srcPtr += srcStride[plane];
00726                     dstPtr += dstStride[plane];
00727                 }
00728             } else if (dstStride[plane] == srcStride[plane] &&
00729                        srcStride[plane] > 0 && srcStride[plane] == length) {
00730                 memcpy(dst[plane] + dstStride[plane] * y, src[plane],
00731                        height * dstStride[plane]);
00732             } else {
00733                 if (is16BPS(c->srcFormat) && is16BPS(c->dstFormat))
00734                     length *= 2;
00735                 else if (!av_pix_fmt_descriptors[c->srcFormat].comp[0].depth_minus1)
00736                     length >>= 3; // monowhite/black
00737                 for (i = 0; i < height; i++) {
00738                     memcpy(dstPtr, srcPtr, length);
00739                     srcPtr += srcStride[plane];
00740                     dstPtr += dstStride[plane];
00741                 }
00742             }
00743         }
00744     }
00745     return srcSliceH;
00746 }
00747 
00748 
00749 #define IS_DIFFERENT_ENDIANESS(src_fmt, dst_fmt, pix_fmt)          \
00750     ((src_fmt == pix_fmt ## BE && dst_fmt == pix_fmt ## LE) ||     \
00751      (src_fmt == pix_fmt ## LE && dst_fmt == pix_fmt ## BE))
00752 
00753 
00754 void ff_get_unscaled_swscale(SwsContext *c)
00755 {
00756     const enum PixelFormat srcFormat = c->srcFormat;
00757     const enum PixelFormat dstFormat = c->dstFormat;
00758     const int flags = c->flags;
00759     const int dstH = c->dstH;
00760     int needsDither;
00761 
00762     needsDither = isAnyRGB(dstFormat) &&
00763             c->dstFormatBpp < 24 &&
00764            (c->dstFormatBpp < c->srcFormatBpp || (!isAnyRGB(srcFormat)));
00765 
00766     /* yv12_to_nv12 */
00767     if ((srcFormat == PIX_FMT_YUV420P || srcFormat == PIX_FMT_YUVA420P) &&
00768         (dstFormat == PIX_FMT_NV12 || dstFormat == PIX_FMT_NV21)) {
00769         c->swScale = planarToNv12Wrapper;
00770     }
00771     /* yuv2bgr */
00772     if ((srcFormat == PIX_FMT_YUV420P || srcFormat == PIX_FMT_YUV422P ||
00773          srcFormat == PIX_FMT_YUVA420P) && isAnyRGB(dstFormat) &&
00774         !(flags & SWS_ACCURATE_RND) && !(dstH & 1)) {
00775         c->swScale = ff_yuv2rgb_get_func_ptr(c);
00776     }
00777 
00778     if (srcFormat == PIX_FMT_YUV410P &&
00779         (dstFormat == PIX_FMT_YUV420P || dstFormat == PIX_FMT_YUVA420P) &&
00780         !(flags & SWS_BITEXACT)) {
00781         c->swScale = yvu9ToYv12Wrapper;
00782     }
00783 
00784     /* bgr24toYV12 */
00785     if (srcFormat == PIX_FMT_BGR24 &&
00786         (dstFormat == PIX_FMT_YUV420P || dstFormat == PIX_FMT_YUVA420P) &&
00787         !(flags & SWS_ACCURATE_RND))
00788         c->swScale = bgr24ToYv12Wrapper;
00789 
00790     /* RGB/BGR -> RGB/BGR (no dither needed forms) */
00791     if (isAnyRGB(srcFormat) && isAnyRGB(dstFormat) && findRgbConvFn(c)
00792         && (!needsDither || (c->flags&(SWS_FAST_BILINEAR|SWS_POINT))))
00793         c->swScale= rgbToRgbWrapper;
00794 
00795 #define isByteRGB(f) (\
00796         f == PIX_FMT_RGB32   ||\
00797         f == PIX_FMT_RGB32_1 ||\
00798         f == PIX_FMT_RGB24   ||\
00799         f == PIX_FMT_BGR32   ||\
00800         f == PIX_FMT_BGR32_1 ||\
00801         f == PIX_FMT_BGR24)
00802 
00803     if (isAnyRGB(srcFormat) && isPlanar(srcFormat) && isByteRGB(dstFormat))
00804         c->swScale= planarRgbToRgbWrapper;
00805 
00806     /* bswap 16 bits per pixel/component packed formats */
00807     if (IS_DIFFERENT_ENDIANESS(srcFormat, dstFormat, PIX_FMT_BGR444) ||
00808         IS_DIFFERENT_ENDIANESS(srcFormat, dstFormat, PIX_FMT_BGR48)  ||
00809         IS_DIFFERENT_ENDIANESS(srcFormat, dstFormat, PIX_FMT_BGR555) ||
00810         IS_DIFFERENT_ENDIANESS(srcFormat, dstFormat, PIX_FMT_BGR565) ||
00811         IS_DIFFERENT_ENDIANESS(srcFormat, dstFormat, PIX_FMT_GRAY16) ||
00812         IS_DIFFERENT_ENDIANESS(srcFormat, dstFormat, PIX_FMT_RGB444) ||
00813         IS_DIFFERENT_ENDIANESS(srcFormat, dstFormat, PIX_FMT_RGB48)  ||
00814         IS_DIFFERENT_ENDIANESS(srcFormat, dstFormat, PIX_FMT_RGB555) ||
00815         IS_DIFFERENT_ENDIANESS(srcFormat, dstFormat, PIX_FMT_RGB565))
00816         c->swScale = packed_16bpc_bswap;
00817 
00818     if (usePal(srcFormat) && isByteRGB(dstFormat))
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 #define isPlanarGray(x) (isGray(x) && (x) != PIX_FMT_GRAY8A)
00850     /* simple copy */
00851     if ( srcFormat == dstFormat ||
00852         (srcFormat == PIX_FMT_YUVA420P && dstFormat == PIX_FMT_YUV420P) ||
00853         (srcFormat == PIX_FMT_YUV420P && dstFormat == PIX_FMT_YUVA420P) ||
00854         (isPlanarYUV(srcFormat) && isPlanarGray(dstFormat)) ||
00855         (isPlanarYUV(dstFormat) && isPlanarGray(srcFormat)) ||
00856         (isPlanarGray(dstFormat) && isPlanarGray(srcFormat)) ||
00857         (isPlanarYUV(srcFormat) && isPlanarYUV(dstFormat) &&
00858          c->chrDstHSubSample == c->chrSrcHSubSample &&
00859          c->chrDstVSubSample == c->chrSrcVSubSample &&
00860          dstFormat != PIX_FMT_NV12 && dstFormat != PIX_FMT_NV21 &&
00861          srcFormat != PIX_FMT_NV12 && srcFormat != PIX_FMT_NV21))
00862     {
00863         if (isPacked(c->srcFormat))
00864             c->swScale = packedCopyWrapper;
00865         else /* Planar YUV or gray */
00866             c->swScale = planarCopyWrapper;
00867     }
00868 
00869     if (ARCH_BFIN)
00870         ff_bfin_get_unscaled_swscale(c);
00871     if (HAVE_ALTIVEC)
00872         ff_swscale_get_unscaled_altivec(c);
00873 }
00874 
00875 static void reset_ptr(const uint8_t *src[], int format)
00876 {
00877     if (!isALPHA(format))
00878         src[3] = NULL;
00879     if (!isPlanar(format)) {
00880         src[3] = src[2] = NULL;
00881 
00882         if (!usePal(format))
00883             src[1] = NULL;
00884     }
00885 }
00886 
00887 static int check_image_pointers(const uint8_t * const data[4], enum PixelFormat pix_fmt,
00888                                 const int linesizes[4])
00889 {
00890     const AVPixFmtDescriptor *desc = &av_pix_fmt_descriptors[pix_fmt];
00891     int i;
00892 
00893     for (i = 0; i < 4; i++) {
00894         int plane = desc->comp[i].plane;
00895         if (!data[plane] || !linesizes[plane])
00896             return 0;
00897     }
00898 
00899     return 1;
00900 }
00901 
00906 int attribute_align_arg sws_scale(struct SwsContext *c,
00907                                   const uint8_t * const srcSlice[],
00908                                   const int srcStride[], int srcSliceY,
00909                                   int srcSliceH, uint8_t *const dst[],
00910                                   const int dstStride[])
00911 {
00912     int i, ret;
00913     const uint8_t *src2[4] = { srcSlice[0], srcSlice[1], srcSlice[2], srcSlice[3] };
00914     uint8_t *dst2[4] = { dst[0], dst[1], dst[2], dst[3] };
00915     uint8_t *rgb0_tmp = NULL;
00916 
00917     // do not mess up sliceDir if we have a "trailing" 0-size slice
00918     if (srcSliceH == 0)
00919         return 0;
00920 
00921     if (!check_image_pointers(srcSlice, c->srcFormat, srcStride)) {
00922         av_log(c, AV_LOG_ERROR, "bad src image pointers\n");
00923         return 0;
00924     }
00925     if (!check_image_pointers((const uint8_t* const*)dst, c->dstFormat, dstStride)) {
00926         av_log(c, AV_LOG_ERROR, "bad dst image pointers\n");
00927         return 0;
00928     }
00929 
00930     if (c->sliceDir == 0 && srcSliceY != 0 && srcSliceY + srcSliceH != c->srcH) {
00931         av_log(c, AV_LOG_ERROR, "Slices start in the middle!\n");
00932         return 0;
00933     }
00934     if (c->sliceDir == 0) {
00935         if (srcSliceY == 0) c->sliceDir = 1; else c->sliceDir = -1;
00936     }
00937 
00938     if (usePal(c->srcFormat)) {
00939         for (i = 0; i < 256; i++) {
00940             int p, r, g, b, y, u, v, a = 0xff;
00941             if (c->srcFormat == PIX_FMT_PAL8) {
00942                 p = ((const uint32_t *)(srcSlice[1]))[i];
00943                 a = (p >> 24) & 0xFF;
00944                 r = (p >> 16) & 0xFF;
00945                 g = (p >>  8) & 0xFF;
00946                 b =  p        & 0xFF;
00947             } else if (c->srcFormat == PIX_FMT_RGB8) {
00948                 r = ( i >> 5     ) * 36;
00949                 g = ((i >> 2) & 7) * 36;
00950                 b = ( i       & 3) * 85;
00951             } else if (c->srcFormat == PIX_FMT_BGR8) {
00952                 b = ( i >> 6     ) * 85;
00953                 g = ((i >> 3) & 7) * 36;
00954                 r = ( i       & 7) * 36;
00955             } else if (c->srcFormat == PIX_FMT_RGB4_BYTE) {
00956                 r = ( i >> 3     ) * 255;
00957                 g = ((i >> 1) & 3) * 85;
00958                 b = ( i       & 1) * 255;
00959             } else if (c->srcFormat == PIX_FMT_GRAY8 || c->srcFormat == PIX_FMT_GRAY8A) {
00960                 r = g = b = i;
00961             } else {
00962                 assert(c->srcFormat == PIX_FMT_BGR4_BYTE);
00963                 b = ( i >> 3     ) * 255;
00964                 g = ((i >> 1) & 3) * 85;
00965                 r = ( i       & 1) * 255;
00966             }
00967             y = av_clip_uint8((RY * r + GY * g + BY * b + ( 33 << (RGB2YUV_SHIFT - 1))) >> RGB2YUV_SHIFT);
00968             u = av_clip_uint8((RU * r + GU * g + BU * b + (257 << (RGB2YUV_SHIFT - 1))) >> RGB2YUV_SHIFT);
00969             v = av_clip_uint8((RV * r + GV * g + BV * b + (257 << (RGB2YUV_SHIFT - 1))) >> RGB2YUV_SHIFT);
00970             c->pal_yuv[i]= y + (u<<8) + (v<<16) + (a<<24);
00971 
00972             switch (c->dstFormat) {
00973             case PIX_FMT_BGR32:
00974 #if !HAVE_BIGENDIAN
00975             case PIX_FMT_RGB24:
00976 #endif
00977                 c->pal_rgb[i]=  r + (g<<8) + (b<<16) + (a<<24);
00978                 break;
00979             case PIX_FMT_BGR32_1:
00980 #if HAVE_BIGENDIAN
00981             case PIX_FMT_BGR24:
00982 #endif
00983                 c->pal_rgb[i]= a + (r<<8) + (g<<16) + (b<<24);
00984                 break;
00985             case PIX_FMT_RGB32_1:
00986 #if HAVE_BIGENDIAN
00987             case PIX_FMT_RGB24:
00988 #endif
00989                 c->pal_rgb[i]= a + (b<<8) + (g<<16) + (r<<24);
00990                 break;
00991             case PIX_FMT_RGB32:
00992 #if !HAVE_BIGENDIAN
00993             case PIX_FMT_BGR24:
00994 #endif
00995             default:
00996                 c->pal_rgb[i]=  b + (g<<8) + (r<<16) + (a<<24);
00997             }
00998         }
00999     }
01000 
01001     if (c->src0Alpha && !c->dst0Alpha && isALPHA(c->dstFormat)) {
01002         uint8_t *base;
01003         int x,y;
01004         rgb0_tmp = av_malloc(FFABS(srcStride[0]) * srcSliceH + 32);
01005         base = srcStride[0] < 0 ? rgb0_tmp - srcStride[0] * (srcSliceH-1) : rgb0_tmp;
01006         for (y=0; y<srcSliceH; y++){
01007             memcpy(base + srcStride[0]*y, src2[0] + srcStride[0]*y, 4*c->srcW);
01008             for (x=c->src0Alpha-1; x<4*c->srcW; x+=4) {
01009                 base[ srcStride[0]*y + x] = 0xFF;
01010             }
01011         }
01012         src2[0] = base;
01013     }
01014 
01015     // copy strides, so they can safely be modified
01016     if (c->sliceDir == 1) {
01017         // slices go from top to bottom
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         reset_ptr(src2, c->srcFormat);
01024         reset_ptr((void*)dst2, c->dstFormat);
01025 
01026         /* reset slice direction at end of frame */
01027         if (srcSliceY + srcSliceH == c->srcH)
01028             c->sliceDir = 0;
01029 
01030         ret = c->swScale(c, src2, srcStride2, srcSliceY, srcSliceH, dst2,
01031                           dstStride2);
01032     } else {
01033         // slices go from bottom to top => we flip the image internally
01034         int srcStride2[4] = { -srcStride[0], -srcStride[1], -srcStride[2],
01035                               -srcStride[3] };
01036         int dstStride2[4] = { -dstStride[0], -dstStride[1], -dstStride[2],
01037                               -dstStride[3] };
01038 
01039         src2[0] += (srcSliceH - 1) * srcStride[0];
01040         if (!usePal(c->srcFormat))
01041             src2[1] += ((srcSliceH >> c->chrSrcVSubSample) - 1) * srcStride[1];
01042         src2[2] += ((srcSliceH >> c->chrSrcVSubSample) - 1) * srcStride[2];
01043         src2[3] += (srcSliceH - 1) * srcStride[3];
01044         dst2[0] += ( c->dstH                         - 1) * dstStride[0];
01045         dst2[1] += ((c->dstH >> c->chrDstVSubSample) - 1) * dstStride[1];
01046         dst2[2] += ((c->dstH >> c->chrDstVSubSample) - 1) * dstStride[2];
01047         dst2[3] += ( c->dstH                         - 1) * dstStride[3];
01048 
01049         reset_ptr(src2, c->srcFormat);
01050         reset_ptr((void*)dst2, c->dstFormat);
01051 
01052         /* reset slice direction at end of frame */
01053         if (!srcSliceY)
01054             c->sliceDir = 0;
01055 
01056         ret = c->swScale(c, src2, srcStride2, c->srcH-srcSliceY-srcSliceH,
01057                           srcSliceH, dst2, dstStride2);
01058     }
01059 
01060     av_free(rgb0_tmp);
01061     return ret;
01062 }
01063 
01064 /* Convert the palette to the same packed 32-bit format as the palette */
01065 void sws_convertPalette8ToPacked32(const uint8_t *src, uint8_t *dst,
01066                                    int num_pixels, const uint8_t *palette)
01067 {
01068     int i;
01069 
01070     for (i = 0; i < num_pixels; i++)
01071         ((uint32_t *) dst)[i] = ((const uint32_t *) palette)[src[i]];
01072 }
01073 
01074 /* Palette format: ABCD -> dst format: ABC */
01075 void sws_convertPalette8ToPacked24(const uint8_t *src, uint8_t *dst,
01076                                    int num_pixels, const uint8_t *palette)
01077 {
01078     int i;
01079 
01080     for (i = 0; i < num_pixels; i++) {
01081         //FIXME slow?
01082         dst[0] = palette[src[i] * 4 + 0];
01083         dst[1] = palette[src[i] * 4 + 1];
01084         dst[2] = palette[src[i] * 4 + 2];
01085         dst += 3;
01086     }
01087 }