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Make sure src/dst are NULL when they arent used, some code uses this to

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simpify checks.

Originally committed as revision 29214 to svn://svn.mplayerhq.hu/mplayer/trunk/libswscale
This commit is contained in:
Michael Niedermayer 2009-04-21 00:01:59 +00:00
parent 081aa41db9
commit b87fae9f56
1 changed files with 28 additions and 5 deletions
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33
libswscale/swscale.c
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@ -2931,6 +2931,21 @@ SwsContext *sws_getContext(int srcW, int srcH, enum PixelFormat srcFormat, int d
return c;
}
static int reset_ptr(uint8_t* src[], int format){
if(!isALPHA(format))
src[3]=NULL;
if(!isPlanarYUV(format)){
src[3]=src[2]=NULL;
if( format != PIX_FMT_PAL8
&& format != PIX_FMT_RGB8
&& format != PIX_FMT_BGR8
&& format != PIX_FMT_RGB4_BYTE
&& format != PIX_FMT_BGR4_BYTE
)
src[1]= NULL;
}
}
/**
* swscale wrapper, so we don't need to export the SwsContext.
* Assumes planar YUV to be in YUV order instead of YVU.
@ -2939,6 +2954,7 @@ int sws_scale(SwsContext *c, uint8_t* src[], int srcStride[], int srcSliceY,
int srcSliceH, uint8_t* dst[], int dstStride[]){
int i;
uint8_t* src2[4]= {src[0], src[1], src[2], src[3]};
uint8_t* dst2[4]= {dst[0], dst[1], dst[2], dst[3]};
if (c->sliceDir == 0 && srcSliceY != 0 && srcSliceY + srcSliceH != c->srcH) {
av_log(c, AV_LOG_ERROR, "Slices start in the middle!\n");
@ -3014,13 +3030,13 @@ int sws_scale(SwsContext *c, uint8_t* src[], int srcStride[], int srcSliceY,
// slices go from top to bottom
int srcStride2[4]= {srcStride[0], srcStride[1], srcStride[2], srcStride[3]};
int dstStride2[4]= {dstStride[0], dstStride[1], dstStride[2], dstStride[3]};
return c->swScale(c, src2, srcStride2, srcSliceY, srcSliceH, dst, dstStride2);
reset_ptr(src2, c->srcFormat);
reset_ptr(dst2, c->dstFormat);
return c->swScale(c, src2, srcStride2, srcSliceY, srcSliceH, dst2, dstStride2);
} else {
// slices go from bottom to top => we flip the image internally
uint8_t* dst2[4]= {dst[0] + (c->dstH-1)*dstStride[0],
dst[1] + ((c->dstH>>c->chrDstVSubSample)-1)*dstStride[1],
dst[2] + ((c->dstH>>c->chrDstVSubSample)-1)*dstStride[2],
dst[3] + (c->dstH-1)*dstStride[3]};
int srcStride2[4]= {-srcStride[0], -srcStride[1], -srcStride[2], -srcStride[3]};
int dstStride2[4]= {-dstStride[0], -dstStride[1], -dstStride[2], -dstStride[3]};
@ -3029,6 +3045,13 @@ int sws_scale(SwsContext *c, uint8_t* src[], int srcStride[], int srcSliceY,
src2[1] += ((srcSliceH>>c->chrSrcVSubSample)-1)*srcStride[1];
src2[2] += ((srcSliceH>>c->chrSrcVSubSample)-1)*srcStride[2];
src2[3] += (srcSliceH-1)*srcStride[3];
dst2[0] += ( c->dstH -1)*dstStride[0];
dst2[1] += ((c->dstH>>c->chrDstVSubSample)-1)*dstStride[1];
dst2[2] += ((c->dstH>>c->chrDstVSubSample)-1)*dstStride[2];
dst2[3] += ( c->dstH -1)*dstStride[3];
reset_ptr(src2, c->srcFormat);
reset_ptr(dst2, c->dstFormat);
return c->swScale(c, src2, srcStride2, c->srcH-srcSliceY-srcSliceH, srcSliceH, dst2, dstStride2);
}