FFmpeg: libswscale/swscale_unscaled.c Source File

00001 /*
00002  * Copyright (C) 2001-2003 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, uint8_t val)
00049 {
00050     int i;
00051     uint8_t *ptr = plane + stride*y;
00052     for (i=0; i<height; i++) {
00053         memset(ptr, val, width);
00054         ptr += stride;
00055     }
00056 }
00057 
00058 static void copyPlane(const uint8_t *src, int srcStride,
00059                       int srcSliceY, int srcSliceH, int width,
00060                       uint8_t *dst, int dstStride)
00061 {
00062     dst += dstStride * srcSliceY;
00063     if (dstStride == srcStride && srcStride > 0) {
00064         memcpy(dst, src, srcSliceH * dstStride);
00065     } else {
00066         int i;
00067         for (i=0; i<srcSliceH; i++) {
00068             memcpy(dst, src, width);
00069             src += srcStride;
00070             dst += dstStride;
00071         }
00072     }
00073 }
00074 
00075 static int planarToNv12Wrapper(SwsContext *c, const uint8_t* src[], int srcStride[], int srcSliceY,
00076                                int srcSliceH, uint8_t* dstParam[], int dstStride[])
00077 {
00078     uint8_t *dst = dstParam[1] + dstStride[1]*srcSliceY/2;
00079 
00080     copyPlane(src[0], srcStride[0], srcSliceY, srcSliceH, c->srcW,
00081               dstParam[0], dstStride[0]);
00082 
00083     if (c->dstFormat == PIX_FMT_NV12)
00084         interleaveBytes(src[1], src[2], dst, c->srcW/2, srcSliceH/2, srcStride[1], srcStride[2], dstStride[0]);
00085     else
00086         interleaveBytes(src[2], src[1], dst, c->srcW/2, srcSliceH/2, srcStride[2], srcStride[1], dstStride[0]);
00087 
00088     return srcSliceH;
00089 }
00090 
00091 static int planarToYuy2Wrapper(SwsContext *c, const uint8_t* src[], int srcStride[], int srcSliceY,
00092                                int srcSliceH, uint8_t* dstParam[], int dstStride[])
00093 {
00094     uint8_t *dst=dstParam[0] + dstStride[0]*srcSliceY;
00095 
00096     yv12toyuy2(src[0], src[1], src[2], dst, c->srcW, srcSliceH, srcStride[0], srcStride[1], dstStride[0]);
00097 
00098     return srcSliceH;
00099 }
00100 
00101 static int planarToUyvyWrapper(SwsContext *c, const uint8_t* src[], int srcStride[], int srcSliceY,
00102                                int srcSliceH, uint8_t* dstParam[], int dstStride[])
00103 {
00104     uint8_t *dst=dstParam[0] + dstStride[0]*srcSliceY;
00105 
00106     yv12touyvy(src[0], src[1], src[2], dst, c->srcW, srcSliceH, srcStride[0], srcStride[1], dstStride[0]);
00107 
00108     return srcSliceH;
00109 }
00110 
00111 static int yuv422pToYuy2Wrapper(SwsContext *c, const uint8_t* src[], int srcStride[], int srcSliceY,
00112                                 int srcSliceH, uint8_t* dstParam[], int dstStride[])
00113 {
00114     uint8_t *dst=dstParam[0] + dstStride[0]*srcSliceY;
00115 
00116     yuv422ptoyuy2(src[0],src[1],src[2],dst,c->srcW,srcSliceH,srcStride[0],srcStride[1],dstStride[0]);
00117 
00118     return srcSliceH;
00119 }
00120 
00121 static int yuv422pToUyvyWrapper(SwsContext *c, const uint8_t* src[], int srcStride[], int srcSliceY,
00122                                 int srcSliceH, uint8_t* dstParam[], int dstStride[])
00123 {
00124     uint8_t *dst=dstParam[0] + dstStride[0]*srcSliceY;
00125 
00126     yuv422ptouyvy(src[0],src[1],src[2],dst,c->srcW,srcSliceH,srcStride[0],srcStride[1],dstStride[0]);
00127 
00128     return srcSliceH;
00129 }
00130 
00131 static int yuyvToYuv420Wrapper(SwsContext *c, const uint8_t* src[], int srcStride[], int srcSliceY,
00132                                int srcSliceH, uint8_t* dstParam[], int dstStride[])
00133 {
00134     uint8_t *ydst=dstParam[0] + dstStride[0]*srcSliceY;
00135     uint8_t *udst=dstParam[1] + dstStride[1]*srcSliceY/2;
00136     uint8_t *vdst=dstParam[2] + dstStride[2]*srcSliceY/2;
00137 
00138     yuyvtoyuv420(ydst, udst, vdst, src[0], c->srcW, srcSliceH, dstStride[0], dstStride[1], srcStride[0]);
00139 
00140     if (dstParam[3])
00141         fillPlane(dstParam[3], dstStride[3], c->srcW, srcSliceH, srcSliceY, 255);
00142 
00143     return srcSliceH;
00144 }
00145 
00146 static int yuyvToYuv422Wrapper(SwsContext *c, const uint8_t* src[], int srcStride[], int srcSliceY,
00147                                int srcSliceH, uint8_t* dstParam[], int dstStride[])
00148 {
00149     uint8_t *ydst=dstParam[0] + dstStride[0]*srcSliceY;
00150     uint8_t *udst=dstParam[1] + dstStride[1]*srcSliceY;
00151     uint8_t *vdst=dstParam[2] + dstStride[2]*srcSliceY;
00152 
00153     yuyvtoyuv422(ydst, udst, vdst, src[0], c->srcW, srcSliceH, dstStride[0], dstStride[1], srcStride[0]);
00154 
00155     return srcSliceH;
00156 }
00157 
00158 static int uyvyToYuv420Wrapper(SwsContext *c, const uint8_t* src[], int srcStride[], int srcSliceY,
00159                                int srcSliceH, uint8_t* dstParam[], int dstStride[])
00160 {
00161     uint8_t *ydst=dstParam[0] + dstStride[0]*srcSliceY;
00162     uint8_t *udst=dstParam[1] + dstStride[1]*srcSliceY/2;
00163     uint8_t *vdst=dstParam[2] + dstStride[2]*srcSliceY/2;
00164 
00165     uyvytoyuv420(ydst, udst, vdst, src[0], c->srcW, srcSliceH, dstStride[0], dstStride[1], srcStride[0]);
00166 
00167     if (dstParam[3])
00168         fillPlane(dstParam[3], dstStride[3], c->srcW, srcSliceH, srcSliceY, 255);
00169 
00170     return srcSliceH;
00171 }
00172 
00173 static int uyvyToYuv422Wrapper(SwsContext *c, const uint8_t* src[], int srcStride[], int srcSliceY,
00174                                int srcSliceH, uint8_t* dstParam[], int dstStride[])
00175 {
00176     uint8_t *ydst=dstParam[0] + dstStride[0]*srcSliceY;
00177     uint8_t *udst=dstParam[1] + dstStride[1]*srcSliceY;
00178     uint8_t *vdst=dstParam[2] + dstStride[2]*srcSliceY;
00179 
00180     uyvytoyuv422(ydst, udst, vdst, src[0], c->srcW, srcSliceH, dstStride[0], dstStride[1], srcStride[0]);
00181 
00182     return srcSliceH;
00183 }
00184 
00185 static void gray8aToPacked32(const uint8_t *src, uint8_t *dst, int num_pixels, const uint8_t *palette)
00186 {
00187     int i;
00188     for (i=0; i<num_pixels; i++)
00189         ((uint32_t *) dst)[i] = ((const uint32_t *)palette)[src[i<<1]] | (src[(i<<1)+1] << 24);
00190 }
00191 
00192 static void gray8aToPacked32_1(const uint8_t *src, uint8_t *dst, int num_pixels, const uint8_t *palette)
00193 {
00194     int i;
00195 
00196     for (i=0; i<num_pixels; i++)
00197         ((uint32_t *) dst)[i] = ((const uint32_t *)palette)[src[i<<1]] | src[(i<<1)+1];
00198 }
00199 
00200 static void gray8aToPacked24(const uint8_t *src, uint8_t *dst, int num_pixels, const uint8_t *palette)
00201 {
00202     int i;
00203 
00204     for (i=0; i<num_pixels; i++) {
00205         //FIXME slow?
00206         dst[0]= palette[src[i<<1]*4+0];
00207         dst[1]= palette[src[i<<1]*4+1];
00208         dst[2]= palette[src[i<<1]*4+2];
00209         dst+= 3;
00210     }
00211 }
00212 
00213 static int palToRgbWrapper(SwsContext *c, const uint8_t* src[], int srcStride[], int srcSliceY,
00214                            int srcSliceH, uint8_t* dst[], int dstStride[])
00215 {
00216     const enum PixelFormat srcFormat= c->srcFormat;
00217     const enum PixelFormat dstFormat= c->dstFormat;
00218     void (*conv)(const uint8_t *src, uint8_t *dst, int num_pixels,
00219                  const uint8_t *palette)=NULL;
00220     int i;
00221     uint8_t *dstPtr= dst[0] + dstStride[0]*srcSliceY;
00222     const uint8_t *srcPtr= src[0];
00223 
00224     if (srcFormat == PIX_FMT_GRAY8A) {
00225         switch (dstFormat) {
00226         case PIX_FMT_RGB32  : conv = gray8aToPacked32; break;
00227         case PIX_FMT_BGR32  : conv = gray8aToPacked32; break;
00228         case PIX_FMT_BGR32_1: conv = gray8aToPacked32_1; break;
00229         case PIX_FMT_RGB32_1: conv = gray8aToPacked32_1; break;
00230         case PIX_FMT_RGB24  : conv = gray8aToPacked24; break;
00231         case PIX_FMT_BGR24  : conv = gray8aToPacked24; break;
00232         }
00233     } else if (usePal(srcFormat)) {
00234         switch (dstFormat) {
00235         case PIX_FMT_RGB32  : conv = sws_convertPalette8ToPacked32; break;
00236         case PIX_FMT_BGR32  : conv = sws_convertPalette8ToPacked32; break;
00237         case PIX_FMT_BGR32_1: conv = sws_convertPalette8ToPacked32; break;
00238         case PIX_FMT_RGB32_1: conv = sws_convertPalette8ToPacked32; break;
00239         case PIX_FMT_RGB24  : conv = sws_convertPalette8ToPacked24; break;
00240         case PIX_FMT_BGR24  : conv = sws_convertPalette8ToPacked24; break;
00241         }
00242     }
00243 
00244     if (!conv)
00245         av_log(c, AV_LOG_ERROR, "internal error %s -> %s converter\n",
00246                av_get_pix_fmt_name(srcFormat), av_get_pix_fmt_name(dstFormat));
00247     else {
00248         for (i=0; i<srcSliceH; i++) {
00249             conv(srcPtr, dstPtr, c->srcW, (uint8_t *) c->pal_rgb);
00250             srcPtr+= srcStride[0];
00251             dstPtr+= dstStride[0];
00252         }
00253     }
00254 
00255     return srcSliceH;
00256 }
00257 
00258 #define isRGBA32(x) (            \
00259            (x) == PIX_FMT_ARGB   \
00260         || (x) == PIX_FMT_RGBA   \
00261         || (x) == PIX_FMT_BGRA   \
00262         || (x) == PIX_FMT_ABGR   \
00263         )
00264 
00265 /* {RGB,BGR}{15,16,24,32,32_1} -> {RGB,BGR}{15,16,24,32} */
00266 static int rgbToRgbWrapper(SwsContext *c, const uint8_t* src[], int srcStride[], int srcSliceY,
00267                            int srcSliceH, uint8_t* dst[], int dstStride[])
00268 {
00269     const enum PixelFormat srcFormat= c->srcFormat;
00270     const enum PixelFormat dstFormat= c->dstFormat;
00271     const int srcBpp= (c->srcFormatBpp + 7) >> 3;
00272     const int dstBpp= (c->dstFormatBpp + 7) >> 3;
00273     const int srcId= c->srcFormatBpp >> 2; /* 1:0, 4:1, 8:2, 15:3, 16:4, 24:6, 32:8 */
00274     const int dstId= c->dstFormatBpp >> 2;
00275     void (*conv)(const uint8_t *src, uint8_t *dst, int src_size)=NULL;
00276 
00277 #define CONV_IS(src, dst) (srcFormat == PIX_FMT_##src && dstFormat == PIX_FMT_##dst)
00278 
00279     if (isRGBA32(srcFormat) && isRGBA32(dstFormat)) {
00280         if (     CONV_IS(ABGR, RGBA)
00281               || CONV_IS(ARGB, BGRA)
00282               || CONV_IS(BGRA, ARGB)
00283               || CONV_IS(RGBA, ABGR)) conv = shuffle_bytes_3210;
00284         else if (CONV_IS(ABGR, ARGB)
00285               || CONV_IS(ARGB, ABGR)) conv = shuffle_bytes_0321;
00286         else if (CONV_IS(ABGR, BGRA)
00287               || CONV_IS(ARGB, RGBA)) conv = shuffle_bytes_1230;
00288         else if (CONV_IS(BGRA, RGBA)
00289               || CONV_IS(RGBA, BGRA)) conv = shuffle_bytes_2103;
00290         else if (CONV_IS(BGRA, ABGR)
00291               || CONV_IS(RGBA, ARGB)) conv = shuffle_bytes_3012;
00292     } else
00293     /* BGR -> BGR */
00294     if (  (isBGRinInt(srcFormat) && isBGRinInt(dstFormat))
00295        || (isRGBinInt(srcFormat) && isRGBinInt(dstFormat))) {
00296         switch(srcId | (dstId<<4)) {
00297         case 0x34: conv= rgb16to15; break;
00298         case 0x36: conv= rgb24to15; break;
00299         case 0x38: conv= rgb32to15; break;
00300         case 0x43: conv= rgb15to16; break;
00301         case 0x46: conv= rgb24to16; break;
00302         case 0x48: conv= rgb32to16; break;
00303         case 0x63: conv= rgb15to24; break;
00304         case 0x64: conv= rgb16to24; break;
00305         case 0x68: conv= rgb32to24; break;
00306         case 0x83: conv= rgb15to32; break;
00307         case 0x84: conv= rgb16to32; break;
00308         case 0x86: conv= rgb24to32; break;
00309         }
00310     } else if (  (isBGRinInt(srcFormat) && isRGBinInt(dstFormat))
00311              || (isRGBinInt(srcFormat) && isBGRinInt(dstFormat))) {
00312         switch(srcId | (dstId<<4)) {
00313         case 0x33: conv= rgb15tobgr15; break;
00314         case 0x34: conv= rgb16tobgr15; break;
00315         case 0x36: conv= rgb24tobgr15; break;
00316         case 0x38: conv= rgb32tobgr15; break;
00317         case 0x43: conv= rgb15tobgr16; break;
00318         case 0x44: conv= rgb16tobgr16; break;
00319         case 0x46: conv= rgb24tobgr16; break;
00320         case 0x48: conv= rgb32tobgr16; break;
00321         case 0x63: conv= rgb15tobgr24; break;
00322         case 0x64: conv= rgb16tobgr24; break;
00323         case 0x66: conv= rgb24tobgr24; break;
00324         case 0x68: conv= rgb32tobgr24; break;
00325         case 0x83: conv= rgb15tobgr32; break;
00326         case 0x84: conv= rgb16tobgr32; break;
00327         case 0x86: conv= rgb24tobgr32; break;
00328         }
00329     }
00330 
00331     if (!conv) {
00332         av_log(c, AV_LOG_ERROR, "internal error %s -> %s converter\n",
00333                av_get_pix_fmt_name(srcFormat), av_get_pix_fmt_name(dstFormat));
00334     } else {
00335         const uint8_t *srcPtr= src[0];
00336               uint8_t *dstPtr= dst[0];
00337         if ((srcFormat == PIX_FMT_RGB32_1 || srcFormat == PIX_FMT_BGR32_1) && !isRGBA32(dstFormat))
00338             srcPtr += ALT32_CORR;
00339 
00340         if ((dstFormat == PIX_FMT_RGB32_1 || dstFormat == PIX_FMT_BGR32_1) && !isRGBA32(srcFormat))
00341             dstPtr += ALT32_CORR;
00342 
00343         if (dstStride[0]*srcBpp == srcStride[0]*dstBpp && srcStride[0] > 0 && !(srcStride[0]%srcBpp))
00344             conv(srcPtr, dstPtr + dstStride[0]*srcSliceY, srcSliceH*srcStride[0]);
00345         else {
00346             int i;
00347             dstPtr += dstStride[0]*srcSliceY;
00348 
00349             for (i=0; i<srcSliceH; i++) {
00350                 conv(srcPtr, dstPtr, c->srcW*srcBpp);
00351                 srcPtr+= srcStride[0];
00352                 dstPtr+= dstStride[0];
00353             }
00354         }
00355     }
00356     return srcSliceH;
00357 }
00358 
00359 static int bgr24ToYv12Wrapper(SwsContext *c, const uint8_t* src[], int srcStride[], int srcSliceY,
00360                               int srcSliceH, uint8_t* dst[], int dstStride[])
00361 {
00362     rgb24toyv12(
00363         src[0],
00364         dst[0]+ srcSliceY    *dstStride[0],
00365         dst[1]+(srcSliceY>>1)*dstStride[1],
00366         dst[2]+(srcSliceY>>1)*dstStride[2],
00367         c->srcW, srcSliceH,
00368         dstStride[0], dstStride[1], srcStride[0]);
00369     if (dst[3])
00370         fillPlane(dst[3], dstStride[3], c->srcW, srcSliceH, srcSliceY, 255);
00371     return srcSliceH;
00372 }
00373 
00374 static int yvu9ToYv12Wrapper(SwsContext *c, const uint8_t* src[], int srcStride[], int srcSliceY,
00375                              int srcSliceH, uint8_t* dst[], int dstStride[])
00376 {
00377     copyPlane(src[0], srcStride[0], srcSliceY, srcSliceH, c->srcW,
00378               dst[0], dstStride[0]);
00379 
00380     planar2x(src[1], dst[1] + dstStride[1]*(srcSliceY >> 1), c->chrSrcW,
00381              srcSliceH >> 2, srcStride[1], dstStride[1]);
00382     planar2x(src[2], dst[2] + dstStride[2]*(srcSliceY >> 1), c->chrSrcW,
00383              srcSliceH >> 2, srcStride[2], dstStride[2]);
00384     if (dst[3])
00385         fillPlane(dst[3], dstStride[3], c->srcW, srcSliceH, srcSliceY, 255);
00386     return srcSliceH;
00387 }
00388 
00389 /* unscaled copy like stuff (assumes nearly identical formats) */
00390 static int packedCopyWrapper(SwsContext *c, const uint8_t* src[], int srcStride[], int srcSliceY,
00391                              int srcSliceH, uint8_t* dst[], int dstStride[])
00392 {
00393     if (dstStride[0]==srcStride[0] && srcStride[0] > 0)
00394         memcpy(dst[0] + dstStride[0]*srcSliceY, src[0], srcSliceH*dstStride[0]);
00395     else {
00396         int i;
00397         const uint8_t *srcPtr= src[0];
00398         uint8_t *dstPtr= dst[0] + dstStride[0]*srcSliceY;
00399         int length=0;
00400 
00401         /* universal length finder */
00402         while(length+c->srcW <= FFABS(dstStride[0])
00403            && length+c->srcW <= FFABS(srcStride[0])) length+= c->srcW;
00404         assert(length!=0);
00405 
00406         for (i=0; i<srcSliceH; i++) {
00407             memcpy(dstPtr, srcPtr, length);
00408             srcPtr+= srcStride[0];
00409             dstPtr+= dstStride[0];
00410         }
00411     }
00412     return srcSliceH;
00413 }
00414 
00415 #define DITHER_COPY(dst, dstStride, src, srcStride, bswap, dbswap)\
00416     uint16_t scale= dither_scale[dst_depth-1][src_depth-1];\
00417     int shift= src_depth-dst_depth + dither_scale[src_depth-2][dst_depth-1];\
00418     for (i = 0; i < height; i++) {\
00419         const uint8_t *dither= dithers[src_depth-9][i&7];\
00420         for (j = 0; j < length-7; j+=8){\
00421             dst[j+0] = dbswap((bswap(src[j+0]) + dither[0])*scale>>shift);\
00422             dst[j+1] = dbswap((bswap(src[j+1]) + dither[1])*scale>>shift);\
00423             dst[j+2] = dbswap((bswap(src[j+2]) + dither[2])*scale>>shift);\
00424             dst[j+3] = dbswap((bswap(src[j+3]) + dither[3])*scale>>shift);\
00425             dst[j+4] = dbswap((bswap(src[j+4]) + dither[4])*scale>>shift);\
00426             dst[j+5] = dbswap((bswap(src[j+5]) + dither[5])*scale>>shift);\
00427             dst[j+6] = dbswap((bswap(src[j+6]) + dither[6])*scale>>shift);\
00428             dst[j+7] = dbswap((bswap(src[j+7]) + dither[7])*scale>>shift);\
00429         }\
00430         for (; j < length; j++)\
00431             dst[j] = dbswap((bswap(src[j]) + dither[j&7])*scale>>shift);\
00432         dst += dstStride;\
00433         src += srcStride;\
00434     }
00435 
00436 
00437 static int planarCopyWrapper(SwsContext *c, const uint8_t* src[], int srcStride[], int srcSliceY,
00438                              int srcSliceH, uint8_t* dst[], int dstStride[])
00439 {
00440     int plane, i, j;
00441     for (plane=0; plane<4; plane++) {
00442         int length= (plane==0 || plane==3) ? c->srcW  : -((-c->srcW  )>>c->chrDstHSubSample);
00443         int y=      (plane==0 || plane==3) ? srcSliceY: -((-srcSliceY)>>c->chrDstVSubSample);
00444         int height= (plane==0 || plane==3) ? srcSliceH: -((-srcSliceH)>>c->chrDstVSubSample);
00445         const uint8_t *srcPtr= src[plane];
00446         uint8_t *dstPtr= dst[plane] + dstStride[plane]*y;
00447 
00448         if (!dst[plane]) continue;
00449         // ignore palette for GRAY8
00450         if (plane == 1 && !dst[2]) continue;
00451         if (!src[plane] || (plane == 1 && !src[2])) {
00452             if(is16BPS(c->dstFormat))
00453                 length*=2;
00454             fillPlane(dst[plane], dstStride[plane], length, height, y, (plane==3) ? 255 : 128);
00455         } else {
00456             if(isNBPS(c->srcFormat) || isNBPS(c->dstFormat)
00457                || (is16BPS(c->srcFormat) != is16BPS(c->dstFormat))
00458             ) {
00459                 const int src_depth = av_pix_fmt_descriptors[c->srcFormat].comp[plane].depth_minus1+1;
00460                 const int dst_depth = av_pix_fmt_descriptors[c->dstFormat].comp[plane].depth_minus1+1;
00461                 const uint16_t *srcPtr2 = (const uint16_t*)srcPtr;
00462                 uint16_t *dstPtr2 = (uint16_t*)dstPtr;
00463 
00464                 if (dst_depth == 8) {
00465                     if(isBE(c->srcFormat) == HAVE_BIGENDIAN){
00466                         DITHER_COPY(dstPtr, dstStride[plane], srcPtr2, srcStride[plane]/2, , )
00467                     } else {
00468                         DITHER_COPY(dstPtr, dstStride[plane], srcPtr2, srcStride[plane]/2, av_bswap16, )
00469                     }
00470                 } else if (src_depth == 8) {
00471                     for (i = 0; i < height; i++) {
00472                         if(isBE(c->dstFormat)){
00473                             for (j = 0; j < length; j++)
00474                                 AV_WB16(&dstPtr2[j], (srcPtr[j]<<(dst_depth-8)) |
00475                                                      (srcPtr[j]>>(2*8-dst_depth)));
00476                         } else {
00477                             for (j = 0; j < length; j++)
00478                                 AV_WL16(&dstPtr2[j], (srcPtr[j]<<(dst_depth-8)) |
00479                                                      (srcPtr[j]>>(2*8-dst_depth)));
00480                         }
00481                         dstPtr2 += dstStride[plane]/2;
00482                         srcPtr  += srcStride[plane];
00483                     }
00484                 } else if (src_depth <= dst_depth) {
00485                     for (i = 0; i < height; i++) {
00486 #define COPY_UP(r,w) \
00487     for (j = 0; j < length; j++){ \
00488         unsigned int v= r(&srcPtr2[j]);\
00489         w(&dstPtr2[j], (v<<(dst_depth-src_depth)) | \
00490                        (v>>(2*src_depth-dst_depth)));\
00491     }
00492                         if(isBE(c->srcFormat)){
00493                             if(isBE(c->dstFormat)){
00494                                 COPY_UP(AV_RB16, AV_WB16)
00495                             } else {
00496                                 COPY_UP(AV_RB16, AV_WL16)
00497                             }
00498                         } else {
00499                             if(isBE(c->dstFormat)){
00500                                 COPY_UP(AV_RL16, AV_WB16)
00501                             } else {
00502                                 COPY_UP(AV_RL16, AV_WL16)
00503                             }
00504                         }
00505                         dstPtr2 += dstStride[plane]/2;
00506                         srcPtr2 += srcStride[plane]/2;
00507                     }
00508                 } else {
00509                     if(isBE(c->srcFormat) == HAVE_BIGENDIAN){
00510                         if(isBE(c->dstFormat) == HAVE_BIGENDIAN){
00511                             DITHER_COPY(dstPtr2, dstStride[plane]/2, srcPtr2, srcStride[plane]/2, , )
00512                         } else {
00513                             DITHER_COPY(dstPtr2, dstStride[plane]/2, srcPtr2, srcStride[plane]/2, , av_bswap16)
00514                         }
00515                     }else{
00516                         if(isBE(c->dstFormat) == HAVE_BIGENDIAN){
00517                             DITHER_COPY(dstPtr2, dstStride[plane]/2, srcPtr2, srcStride[plane]/2, av_bswap16, )
00518                         } else {
00519                             DITHER_COPY(dstPtr2, dstStride[plane]/2, srcPtr2, srcStride[plane]/2, av_bswap16, av_bswap16)
00520                         }
00521                     }
00522                 }
00523             } else if(is16BPS(c->srcFormat) && is16BPS(c->dstFormat)
00524                   && isBE(c->srcFormat) != isBE(c->dstFormat)) {
00525 
00526                 for (i=0; i<height; i++) {
00527                     for (j=0; j<length; j++)
00528                         ((uint16_t*)dstPtr)[j] = av_bswap16(((const uint16_t*)srcPtr)[j]);
00529                     srcPtr+= srcStride[plane];
00530                     dstPtr+= dstStride[plane];
00531                 }
00532             } else if (dstStride[plane] == srcStride[plane] &&
00533                        srcStride[plane] > 0 && srcStride[plane] == length) {
00534                 memcpy(dst[plane] + dstStride[plane]*y, src[plane],
00535                        height*dstStride[plane]);
00536             } else {
00537                 if(is16BPS(c->srcFormat) && is16BPS(c->dstFormat))
00538                     length*=2;
00539                 for (i=0; i<height; i++) {
00540                     memcpy(dstPtr, srcPtr, length);
00541                     srcPtr+= srcStride[plane];
00542                     dstPtr+= dstStride[plane];
00543                 }
00544             }
00545         }
00546     }
00547     return srcSliceH;
00548 }
00549 
00550 void ff_get_unscaled_swscale(SwsContext *c)
00551 {
00552     const enum PixelFormat srcFormat = c->srcFormat;
00553     const enum PixelFormat dstFormat = c->dstFormat;
00554     const int flags = c->flags;
00555     const int dstH = c->dstH;
00556     int needsDither;
00557 
00558     needsDither= isAnyRGB(dstFormat)
00559         &&  c->dstFormatBpp < 24
00560         && (c->dstFormatBpp < c->srcFormatBpp || (!isAnyRGB(srcFormat)));
00561 
00562     /* yv12_to_nv12 */
00563     if ((srcFormat == PIX_FMT_YUV420P || srcFormat == PIX_FMT_YUVA420P) && (dstFormat == PIX_FMT_NV12 || dstFormat == PIX_FMT_NV21)) {
00564         c->swScale= planarToNv12Wrapper;
00565     }
00566     /* yuv2bgr */
00567     if ((srcFormat==PIX_FMT_YUV420P || srcFormat==PIX_FMT_YUV422P || srcFormat==PIX_FMT_YUVA420P) && isAnyRGB(dstFormat)
00568         && !(flags & SWS_ACCURATE_RND) && !(dstH&1)) {
00569         c->swScale= ff_yuv2rgb_get_func_ptr(c);
00570     }
00571 
00572     if (srcFormat==PIX_FMT_YUV410P && (dstFormat==PIX_FMT_YUV420P || dstFormat==PIX_FMT_YUVA420P) && !(flags & SWS_BITEXACT)) {
00573         c->swScale= yvu9ToYv12Wrapper;
00574     }
00575 
00576     /* bgr24toYV12 */
00577     if (srcFormat==PIX_FMT_BGR24 && (dstFormat==PIX_FMT_YUV420P || dstFormat==PIX_FMT_YUVA420P) && !(flags & SWS_ACCURATE_RND))
00578         c->swScale= bgr24ToYv12Wrapper;
00579 
00580     /* RGB/BGR -> RGB/BGR (no dither needed forms) */
00581     if (   isAnyRGB(srcFormat)
00582         && isAnyRGB(dstFormat)
00583         && srcFormat != PIX_FMT_BGR8      && dstFormat != PIX_FMT_BGR8
00584         && srcFormat != PIX_FMT_RGB8      && dstFormat != PIX_FMT_RGB8
00585         && srcFormat != PIX_FMT_BGR4      && dstFormat != PIX_FMT_BGR4
00586         && srcFormat != PIX_FMT_RGB4      && dstFormat != PIX_FMT_RGB4
00587         && srcFormat != PIX_FMT_BGR4_BYTE && dstFormat != PIX_FMT_BGR4_BYTE
00588         && srcFormat != PIX_FMT_RGB4_BYTE && dstFormat != PIX_FMT_RGB4_BYTE
00589         && srcFormat != PIX_FMT_MONOBLACK && dstFormat != PIX_FMT_MONOBLACK
00590         && srcFormat != PIX_FMT_MONOWHITE && dstFormat != PIX_FMT_MONOWHITE
00591         && srcFormat != PIX_FMT_RGB48LE   && dstFormat != PIX_FMT_RGB48LE
00592         && srcFormat != PIX_FMT_RGB48BE   && dstFormat != PIX_FMT_RGB48BE
00593         && srcFormat != PIX_FMT_BGR48LE   && dstFormat != PIX_FMT_BGR48LE
00594         && srcFormat != PIX_FMT_BGR48BE   && dstFormat != PIX_FMT_BGR48BE
00595         && (!needsDither || (c->flags&(SWS_FAST_BILINEAR|SWS_POINT))))
00596         c->swScale= rgbToRgbWrapper;
00597 
00598     if ((usePal(srcFormat) && (
00599         dstFormat == PIX_FMT_RGB32   ||
00600         dstFormat == PIX_FMT_RGB32_1 ||
00601         dstFormat == PIX_FMT_RGB24   ||
00602         dstFormat == PIX_FMT_BGR32   ||
00603         dstFormat == PIX_FMT_BGR32_1 ||
00604         dstFormat == PIX_FMT_BGR24)))
00605         c->swScale= palToRgbWrapper;
00606 
00607     if (srcFormat == PIX_FMT_YUV422P) {
00608         if (dstFormat == PIX_FMT_YUYV422)
00609             c->swScale= yuv422pToYuy2Wrapper;
00610         else if (dstFormat == PIX_FMT_UYVY422)
00611             c->swScale= yuv422pToUyvyWrapper;
00612     }
00613 
00614     /* LQ converters if -sws 0 or -sws 4*/
00615     if (c->flags&(SWS_FAST_BILINEAR|SWS_POINT)) {
00616         /* yv12_to_yuy2 */
00617         if (srcFormat == PIX_FMT_YUV420P || srcFormat == PIX_FMT_YUVA420P) {
00618             if (dstFormat == PIX_FMT_YUYV422)
00619                 c->swScale= planarToYuy2Wrapper;
00620             else if (dstFormat == PIX_FMT_UYVY422)
00621                 c->swScale= planarToUyvyWrapper;
00622         }
00623     }
00624     if(srcFormat == PIX_FMT_YUYV422 && (dstFormat == PIX_FMT_YUV420P || dstFormat == PIX_FMT_YUVA420P))
00625         c->swScale= yuyvToYuv420Wrapper;
00626     if(srcFormat == PIX_FMT_UYVY422 && (dstFormat == PIX_FMT_YUV420P || dstFormat == PIX_FMT_YUVA420P))
00627         c->swScale= uyvyToYuv420Wrapper;
00628     if(srcFormat == PIX_FMT_YUYV422 && dstFormat == PIX_FMT_YUV422P)
00629         c->swScale= yuyvToYuv422Wrapper;
00630     if(srcFormat == PIX_FMT_UYVY422 && dstFormat == PIX_FMT_YUV422P)
00631         c->swScale= uyvyToYuv422Wrapper;
00632 
00633     /* simple copy */
00634     if (  srcFormat == dstFormat
00635         || (srcFormat == PIX_FMT_YUVA420P && dstFormat == PIX_FMT_YUV420P)
00636         || (srcFormat == PIX_FMT_YUV420P && dstFormat == PIX_FMT_YUVA420P)
00637         || (isPlanarYUV(srcFormat) && isGray(dstFormat))
00638         || (isPlanarYUV(dstFormat) && isGray(srcFormat))
00639         || (isGray(dstFormat) && isGray(srcFormat))
00640         || (isPlanarYUV(srcFormat) && isPlanarYUV(dstFormat)
00641             && c->chrDstHSubSample == c->chrSrcHSubSample
00642             && c->chrDstVSubSample == c->chrSrcVSubSample
00643             && dstFormat != PIX_FMT_NV12 && dstFormat != PIX_FMT_NV21
00644             && srcFormat != PIX_FMT_NV12 && srcFormat != PIX_FMT_NV21))
00645     {
00646         if (isPacked(c->srcFormat))
00647             c->swScale= packedCopyWrapper;
00648         else /* Planar YUV or gray */
00649             c->swScale= planarCopyWrapper;
00650     }
00651 
00652     if (ARCH_BFIN)
00653         ff_bfin_get_unscaled_swscale(c);
00654     if (HAVE_ALTIVEC)
00655         ff_swscale_get_unscaled_altivec(c);
00656 }
00657 
00658 static void reset_ptr(const uint8_t* src[], int format)
00659 {
00660     if(!isALPHA(format))
00661         src[3]=NULL;
00662     if(!isPlanarYUV(format)) {
00663         src[3]=src[2]=NULL;
00664 
00665         if (!usePal(format))
00666             src[1]= NULL;
00667     }
00668 }
00669 
00670 static int check_image_pointers(uint8_t *data[4], enum PixelFormat pix_fmt,
00671                                 const int linesizes[4])
00672 {
00673     const AVPixFmtDescriptor *desc = &av_pix_fmt_descriptors[pix_fmt];
00674     int i;
00675 
00676     for (i = 0; i < 4; i++) {
00677         int plane = desc->comp[i].plane;
00678         if (!data[plane] || !linesizes[plane])
00679             return 0;
00680     }
00681 
00682     return 1;
00683 }
00684 
00689 int sws_scale(SwsContext *c, const uint8_t* const src[], const int srcStride[], int srcSliceY,
00690               int srcSliceH, uint8_t* const dst[], const int dstStride[])
00691 {
00692     int i;
00693     const uint8_t* src2[4]= {src[0], src[1], src[2], src[3]};
00694     uint8_t* dst2[4]= {dst[0], dst[1], dst[2], dst[3]};
00695 
00696     // do not mess up sliceDir if we have a "trailing" 0-size slice
00697     if (srcSliceH == 0)
00698         return 0;
00699 
00700     if (!check_image_pointers(src, c->srcFormat, srcStride)) {
00701         av_log(c, AV_LOG_ERROR, "bad src image pointers\n");
00702         return 0;
00703     }
00704     if (!check_image_pointers(dst, c->dstFormat, dstStride)) {
00705         av_log(c, AV_LOG_ERROR, "bad dst image pointers\n");
00706         return 0;
00707     }
00708 
00709     if (c->sliceDir == 0 && srcSliceY != 0 && srcSliceY + srcSliceH != c->srcH) {
00710         av_log(c, AV_LOG_ERROR, "Slices start in the middle!\n");
00711         return 0;
00712     }
00713     if (c->sliceDir == 0) {
00714         if (srcSliceY == 0) c->sliceDir = 1; else c->sliceDir = -1;
00715     }
00716 
00717     if (usePal(c->srcFormat)) {
00718         for (i=0; i<256; i++) {
00719             int p, r, g, b, y, u, v, a = 0xff;
00720             if(c->srcFormat == PIX_FMT_PAL8) {
00721                 p=((const uint32_t*)(src[1]))[i];
00722                 a= (p>>24)&0xFF;
00723                 r= (p>>16)&0xFF;
00724                 g= (p>> 8)&0xFF;
00725                 b=  p     &0xFF;
00726             } else if(c->srcFormat == PIX_FMT_RGB8) {
00727                 r= (i>>5    )*36;
00728                 g= ((i>>2)&7)*36;
00729                 b= (i&3     )*85;
00730             } else if(c->srcFormat == PIX_FMT_BGR8) {
00731                 b= (i>>6    )*85;
00732                 g= ((i>>3)&7)*36;
00733                 r= (i&7     )*36;
00734             } else if(c->srcFormat == PIX_FMT_RGB4_BYTE) {
00735                 r= (i>>3    )*255;
00736                 g= ((i>>1)&3)*85;
00737                 b= (i&1     )*255;
00738             } else if(c->srcFormat == PIX_FMT_GRAY8 || c->srcFormat == PIX_FMT_GRAY8A) {
00739                 r = g = b = i;
00740             } else {
00741                 assert(c->srcFormat == PIX_FMT_BGR4_BYTE);
00742                 b= (i>>3    )*255;
00743                 g= ((i>>1)&3)*85;
00744                 r= (i&1     )*255;
00745             }
00746             y= av_clip_uint8((RY*r + GY*g + BY*b + ( 33<<(RGB2YUV_SHIFT-1)))>>RGB2YUV_SHIFT);
00747             u= av_clip_uint8((RU*r + GU*g + BU*b + (257<<(RGB2YUV_SHIFT-1)))>>RGB2YUV_SHIFT);
00748             v= av_clip_uint8((RV*r + GV*g + BV*b + (257<<(RGB2YUV_SHIFT-1)))>>RGB2YUV_SHIFT);
00749             c->pal_yuv[i]= y + (u<<8) + (v<<16) + (a<<24);
00750 
00751             switch(c->dstFormat) {
00752             case PIX_FMT_BGR32:
00753 #if !HAVE_BIGENDIAN
00754             case PIX_FMT_RGB24:
00755 #endif
00756                 c->pal_rgb[i]=  r + (g<<8) + (b<<16) + (a<<24);
00757                 break;
00758             case PIX_FMT_BGR32_1:
00759 #if HAVE_BIGENDIAN
00760             case PIX_FMT_BGR24:
00761 #endif
00762                 c->pal_rgb[i]= a + (r<<8) + (g<<16) + (b<<24);
00763                 break;
00764             case PIX_FMT_RGB32_1:
00765 #if HAVE_BIGENDIAN
00766             case PIX_FMT_RGB24:
00767 #endif
00768                 c->pal_rgb[i]= a + (b<<8) + (g<<16) + (r<<24);
00769                 break;
00770             case PIX_FMT_RGB32:
00771 #if !HAVE_BIGENDIAN
00772             case PIX_FMT_BGR24:
00773 #endif
00774             default:
00775                 c->pal_rgb[i]=  b + (g<<8) + (r<<16) + (a<<24);
00776             }
00777         }
00778     }
00779 
00780     // copy strides, so they can safely be modified
00781     if (c->sliceDir == 1) {
00782         // slices go from top to bottom
00783         int srcStride2[4]= {srcStride[0], srcStride[1], srcStride[2], srcStride[3]};
00784         int dstStride2[4]= {dstStride[0], dstStride[1], dstStride[2], dstStride[3]};
00785 
00786         reset_ptr(src2, c->srcFormat);
00787         reset_ptr((const uint8_t**)dst2, c->dstFormat);
00788 
00789         /* reset slice direction at end of frame */
00790         if (srcSliceY + srcSliceH == c->srcH)
00791             c->sliceDir = 0;
00792 
00793         return c->swScale(c, src2, srcStride2, srcSliceY, srcSliceH, dst2, dstStride2);
00794     } else {
00795         // slices go from bottom to top => we flip the image internally
00796         int srcStride2[4]= {-srcStride[0], -srcStride[1], -srcStride[2], -srcStride[3]};
00797         int dstStride2[4]= {-dstStride[0], -dstStride[1], -dstStride[2], -dstStride[3]};
00798 
00799         src2[0] += (srcSliceH-1)*srcStride[0];
00800         if (!usePal(c->srcFormat))
00801             src2[1] += ((srcSliceH>>c->chrSrcVSubSample)-1)*srcStride[1];
00802         src2[2] += ((srcSliceH>>c->chrSrcVSubSample)-1)*srcStride[2];
00803         src2[3] += (srcSliceH-1)*srcStride[3];
00804         dst2[0] += ( c->dstH                      -1)*dstStride[0];
00805         dst2[1] += ((c->dstH>>c->chrDstVSubSample)-1)*dstStride[1];
00806         dst2[2] += ((c->dstH>>c->chrDstVSubSample)-1)*dstStride[2];
00807         dst2[3] += ( c->dstH                      -1)*dstStride[3];
00808 
00809         reset_ptr(src2, c->srcFormat);
00810         reset_ptr((const uint8_t**)dst2, c->dstFormat);
00811 
00812         /* reset slice direction at end of frame */
00813         if (!srcSliceY)
00814             c->sliceDir = 0;
00815 
00816         return c->swScale(c, src2, srcStride2, c->srcH-srcSliceY-srcSliceH, srcSliceH, dst2, dstStride2);
00817     }
00818 }
00819 
00820 #if LIBSWSCALE_VERSION_MAJOR < 1
00821 int sws_scale_ordered(SwsContext *c, const uint8_t* const src[], int srcStride[], int srcSliceY,
00822                       int srcSliceH, uint8_t* dst[], int dstStride[])
00823 {
00824     return sws_scale(c, src, srcStride, srcSliceY, srcSliceH, dst, dstStride);
00825 }
00826 #endif
00827 
00828 /* Convert the palette to the same packed 32-bit format as the palette */
00829 void sws_convertPalette8ToPacked32(const uint8_t *src, uint8_t *dst, int num_pixels, const uint8_t *palette)
00830 {
00831     int i;
00832 
00833     for (i=0; i<num_pixels; i++)
00834         ((uint32_t *) dst)[i] = ((const uint32_t *) palette)[src[i]];
00835 }
00836 
00837 /* Palette format: ABCD -> dst format: ABC */
00838 void sws_convertPalette8ToPacked24(const uint8_t *src, uint8_t *dst, int num_pixels, const uint8_t *palette)
00839 {
00840     int i;
00841 
00842     for (i=0; i<num_pixels; i++) {
00843         //FIXME slow?
00844         dst[0]= palette[src[i]*4+0];
00845         dst[1]= palette[src[i]*4+1];
00846         dst[2]= palette[src[i]*4+2];
00847         dst+= 3;
00848     }
00849 }