int sws_init_context(SwsContext *c, SwsFilter *srcFilter, SwsFilter *dstFilter) { int i; int usesVFilter, usesHFilter; int unscaled; SwsFilter dummyFilter= {NULL, NULL, NULL, NULL}; int srcW= c->srcW; int srcH= c->srcH; int dstW= c->dstW; int dstH= c->dstH; int dst_stride = FFALIGN(dstW * sizeof(int16_t) + 16, 16), dst_stride_px = dst_stride >> 1; int flags, cpu_flags; enum PixelFormat srcFormat= c->srcFormat; enum PixelFormat dstFormat= c->dstFormat; cpu_flags = av_get_cpu_flags(); flags = c->flags; emms_c(); if (!rgb15to16) sws_rgb2rgb_init(); unscaled = (srcW == dstW && srcH == dstH); if (!isSupportedIn(srcFormat)) { av_log(c, AV_LOG_ERROR, "%s is not supported as input pixel format\n", sws_format_name(srcFormat)); return AVERROR(EINVAL); } if (!isSupportedOut(dstFormat)) { av_log(c, AV_LOG_ERROR, "%s is not supported as output pixel format\n", sws_format_name(dstFormat)); return AVERROR(EINVAL); } i= flags & ( SWS_POINT |SWS_AREA |SWS_BILINEAR |SWS_FAST_BILINEAR |SWS_BICUBIC |SWS_X |SWS_GAUSS |SWS_LANCZOS |SWS_SINC |SWS_SPLINE |SWS_BICUBLIN); if(!i || (i & (i-1))) { av_log(c, AV_LOG_ERROR, "Exactly one scaler algorithm must be chosen\n"); return AVERROR(EINVAL); } /* sanity check */ if (srcW<4 || srcH<1 || dstW<8 || dstH<1) { //FIXME check if these are enough and try to lowwer them after fixing the relevant parts of the code av_log(c, AV_LOG_ERROR, "%dx%d -> %dx%d is invalid scaling dimension\n", srcW, srcH, dstW, dstH); return AVERROR(EINVAL); } if (!dstFilter) dstFilter= &dummyFilter; if (!srcFilter) srcFilter= &dummyFilter; c->lumXInc= ((srcW<<16) + (dstW>>1))/dstW; c->lumYInc= ((srcH<<16) + (dstH>>1))/dstH; c->dstFormatBpp = av_get_bits_per_pixel(&av_pix_fmt_descriptors[dstFormat]); c->srcFormatBpp = av_get_bits_per_pixel(&av_pix_fmt_descriptors[srcFormat]); c->vRounder= 4* 0x0001000100010001ULL; usesVFilter = (srcFilter->lumV && srcFilter->lumV->length>1) || (srcFilter->chrV && srcFilter->chrV->length>1) || (dstFilter->lumV && dstFilter->lumV->length>1) || (dstFilter->chrV && dstFilter->chrV->length>1); usesHFilter = (srcFilter->lumH && srcFilter->lumH->length>1) || (srcFilter->chrH && srcFilter->chrH->length>1) || (dstFilter->lumH && dstFilter->lumH->length>1) || (dstFilter->chrH && dstFilter->chrH->length>1); getSubSampleFactors(&c->chrSrcHSubSample, &c->chrSrcVSubSample, srcFormat); getSubSampleFactors(&c->chrDstHSubSample, &c->chrDstVSubSample, dstFormat); // reuse chroma for 2 pixels RGB/BGR unless user wants full chroma interpolation if (flags & SWS_FULL_CHR_H_INT && dstFormat != PIX_FMT_RGBA && dstFormat != PIX_FMT_ARGB && dstFormat != PIX_FMT_BGRA && dstFormat != PIX_FMT_ABGR && dstFormat != PIX_FMT_RGB24 && dstFormat != PIX_FMT_BGR24) { av_log(c, AV_LOG_ERROR, "full chroma interpolation for destination format '%s' not yet implemented\n", sws_format_name(dstFormat)); flags &= ~SWS_FULL_CHR_H_INT; c->flags = flags; } if (isAnyRGB(dstFormat) && !(flags&SWS_FULL_CHR_H_INT)) c->chrDstHSubSample=1; // drop some chroma lines if the user wants it c->vChrDrop= (flags&SWS_SRC_V_CHR_DROP_MASK)>>SWS_SRC_V_CHR_DROP_SHIFT; c->chrSrcVSubSample+= c->vChrDrop; // drop every other pixel for chroma calculation unless user wants full chroma if (isAnyRGB(srcFormat) && !(flags&SWS_FULL_CHR_H_INP) && srcFormat!=PIX_FMT_RGB8 && srcFormat!=PIX_FMT_BGR8 && srcFormat!=PIX_FMT_RGB4 && srcFormat!=PIX_FMT_BGR4 && srcFormat!=PIX_FMT_RGB4_BYTE && srcFormat!=PIX_FMT_BGR4_BYTE && ((dstW>>c->chrDstHSubSample) <= (srcW>>1) || (flags&SWS_FAST_BILINEAR))) c->chrSrcHSubSample=1; // Note the -((-x)>>y) is so that we always round toward +inf. c->chrSrcW= -((-srcW) >> c->chrSrcHSubSample); c->chrSrcH= -((-srcH) >> c->chrSrcVSubSample); c->chrDstW= -((-dstW) >> c->chrDstHSubSample); c->chrDstH= -((-dstH) >> c->chrDstVSubSample); /* unscaled special cases */ if (unscaled && !usesHFilter && !usesVFilter && (c->srcRange == c->dstRange || isAnyRGB(dstFormat))) { ff_get_unscaled_swscale(c); if (c->swScale) { if (flags&SWS_PRINT_INFO) av_log(c, AV_LOG_INFO, "using unscaled %s -> %s special converter\n", sws_format_name(srcFormat), sws_format_name(dstFormat)); return 0; } } c->scalingBpp = FFMAX(av_pix_fmt_descriptors[srcFormat].comp[0].depth_minus1, av_pix_fmt_descriptors[dstFormat].comp[0].depth_minus1) >= 8 ? 16 : 8; if (c->scalingBpp == 16) dst_stride <<= 1; FF_ALLOC_OR_GOTO(c, c->formatConvBuffer, FFALIGN(srcW, 16) * 2 * c->scalingBpp >> 3, fail); if (HAVE_MMX2 && cpu_flags & AV_CPU_FLAG_MMX2 && c->scalingBpp == 8) { c->canMMX2BeUsed= (dstW >=srcW && (dstW&31)==0 && (srcW&15)==0) ? 1 : 0; if (!c->canMMX2BeUsed && dstW >=srcW && (srcW&15)==0 && (flags&SWS_FAST_BILINEAR)) { if (flags&SWS_PRINT_INFO) av_log(c, AV_LOG_INFO, "output width is not a multiple of 32 -> no MMX2 scaler\n"); } if (usesHFilter) c->canMMX2BeUsed=0; } else c->canMMX2BeUsed=0; c->chrXInc= ((c->chrSrcW<<16) + (c->chrDstW>>1))/c->chrDstW; c->chrYInc= ((c->chrSrcH<<16) + (c->chrDstH>>1))/c->chrDstH; // match pixel 0 of the src to pixel 0 of dst and match pixel n-2 of src to pixel n-2 of dst // but only for the FAST_BILINEAR mode otherwise do correct scaling // n-2 is the last chrominance sample available // this is not perfect, but no one should notice the difference, the more correct variant // would be like the vertical one, but that would require some special code for the // first and last pixel if (flags&SWS_FAST_BILINEAR) { if (c->canMMX2BeUsed) { c->lumXInc+= 20; c->chrXInc+= 20; } //we don't use the x86 asm scaler if MMX is available else if (HAVE_MMX && cpu_flags & AV_CPU_FLAG_MMX) { c->lumXInc = ((srcW-2)<<16)/(dstW-2) - 20; c->chrXInc = ((c->chrSrcW-2)<<16)/(c->chrDstW-2) - 20; } } /* precalculate horizontal scaler filter coefficients */ { #if HAVE_MMX2 // can't downscale !!! if (c->canMMX2BeUsed && (flags & SWS_FAST_BILINEAR)) { c->lumMmx2FilterCodeSize = initMMX2HScaler( dstW, c->lumXInc, NULL, NULL, NULL, 8); c->chrMmx2FilterCodeSize = initMMX2HScaler(c->chrDstW, c->chrXInc, NULL, NULL, NULL, 4); #ifdef MAP_ANONYMOUS c->lumMmx2FilterCode = mmap(NULL, c->lumMmx2FilterCodeSize, PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_ANONYMOUS, -1, 0); c->chrMmx2FilterCode = mmap(NULL, c->chrMmx2FilterCodeSize, PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_ANONYMOUS, -1, 0); #elif HAVE_VIRTUALALLOC c->lumMmx2FilterCode = VirtualAlloc(NULL, c->lumMmx2FilterCodeSize, MEM_COMMIT, PAGE_EXECUTE_READWRITE); c->chrMmx2FilterCode = VirtualAlloc(NULL, c->chrMmx2FilterCodeSize, MEM_COMMIT, PAGE_EXECUTE_READWRITE); #else c->lumMmx2FilterCode = av_malloc(c->lumMmx2FilterCodeSize); c->chrMmx2FilterCode = av_malloc(c->chrMmx2FilterCodeSize); #endif if (!c->lumMmx2FilterCode || !c->chrMmx2FilterCode) return AVERROR(ENOMEM); FF_ALLOCZ_OR_GOTO(c, c->hLumFilter , (dstW /8+8)*sizeof(int16_t), fail); FF_ALLOCZ_OR_GOTO(c, c->hChrFilter , (c->chrDstW /4+8)*sizeof(int16_t), fail); FF_ALLOCZ_OR_GOTO(c, c->hLumFilterPos, (dstW /2/8+8)*sizeof(int32_t), fail); FF_ALLOCZ_OR_GOTO(c, c->hChrFilterPos, (c->chrDstW/2/4+8)*sizeof(int32_t), fail); initMMX2HScaler( dstW, c->lumXInc, c->lumMmx2FilterCode, c->hLumFilter, c->hLumFilterPos, 8); initMMX2HScaler(c->chrDstW, c->chrXInc, c->chrMmx2FilterCode, c->hChrFilter, c->hChrFilterPos, 4); #ifdef MAP_ANONYMOUS mprotect(c->lumMmx2FilterCode, c->lumMmx2FilterCodeSize, PROT_EXEC | PROT_READ); mprotect(c->chrMmx2FilterCode, c->chrMmx2FilterCodeSize, PROT_EXEC | PROT_READ); #endif } else #endif /* HAVE_MMX2 */ { const int filterAlign= (HAVE_MMX && cpu_flags & AV_CPU_FLAG_MMX) ? 4 : (HAVE_ALTIVEC && cpu_flags & AV_CPU_FLAG_ALTIVEC) ? 8 : 1; if (initFilter(&c->hLumFilter, &c->hLumFilterPos, &c->hLumFilterSize, c->lumXInc, srcW , dstW, filterAlign, 1<<14, (flags&SWS_BICUBLIN) ? (flags|SWS_BICUBIC) : flags, cpu_flags, srcFilter->lumH, dstFilter->lumH, c->param) < 0) goto fail; if (initFilter(&c->hChrFilter, &c->hChrFilterPos, &c->hChrFilterSize, c->chrXInc, c->chrSrcW, c->chrDstW, filterAlign, 1<<14, (flags&SWS_BICUBLIN) ? (flags|SWS_BILINEAR) : flags, cpu_flags, srcFilter->chrH, dstFilter->chrH, c->param) < 0) goto fail; } } // initialize horizontal stuff /* precalculate vertical scaler filter coefficients */ { const int filterAlign= (HAVE_MMX && cpu_flags & AV_CPU_FLAG_MMX) && (flags & SWS_ACCURATE_RND) ? 2 : (HAVE_ALTIVEC && cpu_flags & AV_CPU_FLAG_ALTIVEC) ? 8 : 1; if (initFilter(&c->vLumFilter, &c->vLumFilterPos, &c->vLumFilterSize, c->lumYInc, srcH , dstH, filterAlign, (1<<12), (flags&SWS_BICUBLIN) ? (flags|SWS_BICUBIC) : flags, cpu_flags, srcFilter->lumV, dstFilter->lumV, c->param) < 0) goto fail; if (initFilter(&c->vChrFilter, &c->vChrFilterPos, &c->vChrFilterSize, c->chrYInc, c->chrSrcH, c->chrDstH, filterAlign, (1<<12), (flags&SWS_BICUBLIN) ? (flags|SWS_BILINEAR) : flags, cpu_flags, srcFilter->chrV, dstFilter->chrV, c->param) < 0) goto fail; #if HAVE_ALTIVEC FF_ALLOC_OR_GOTO(c, c->vYCoeffsBank, sizeof (vector signed short)*c->vLumFilterSize*c->dstH, fail); FF_ALLOC_OR_GOTO(c, c->vCCoeffsBank, sizeof (vector signed short)*c->vChrFilterSize*c->chrDstH, fail); for (i=0;i<c->vLumFilterSize*c->dstH;i++) { int j; short *p = (short *)&c->vYCoeffsBank[i]; for (j=0;j<8;j++) p[j] = c->vLumFilter[i]; } for (i=0;i<c->vChrFilterSize*c->chrDstH;i++) { int j; short *p = (short *)&c->vCCoeffsBank[i]; for (j=0;j<8;j++) p[j] = c->vChrFilter[i]; } #endif } // calculate buffer sizes so that they won't run out while handling these damn slices c->vLumBufSize= c->vLumFilterSize; c->vChrBufSize= c->vChrFilterSize; for (i=0; i<dstH; i++) { int chrI= i*c->chrDstH / dstH; int nextSlice= FFMAX(c->vLumFilterPos[i ] + c->vLumFilterSize - 1, ((c->vChrFilterPos[chrI] + c->vChrFilterSize - 1)<<c->chrSrcVSubSample)); nextSlice>>= c->chrSrcVSubSample; nextSlice<<= c->chrSrcVSubSample; if (c->vLumFilterPos[i ] + c->vLumBufSize < nextSlice) c->vLumBufSize= nextSlice - c->vLumFilterPos[i]; if (c->vChrFilterPos[chrI] + c->vChrBufSize < (nextSlice>>c->chrSrcVSubSample)) c->vChrBufSize= (nextSlice>>c->chrSrcVSubSample) - c->vChrFilterPos[chrI]; } // allocate pixbufs (we use dynamic allocation because otherwise we would need to // allocate several megabytes to handle all possible cases) FF_ALLOC_OR_GOTO(c, c->lumPixBuf, c->vLumBufSize*2*sizeof(int16_t*), fail); FF_ALLOC_OR_GOTO(c, c->chrUPixBuf, c->vChrBufSize*2*sizeof(int16_t*), fail); FF_ALLOC_OR_GOTO(c, c->chrVPixBuf, c->vChrBufSize*2*sizeof(int16_t*), fail); if (CONFIG_SWSCALE_ALPHA && isALPHA(c->srcFormat) && isALPHA(c->dstFormat)) FF_ALLOCZ_OR_GOTO(c, c->alpPixBuf, c->vLumBufSize*2*sizeof(int16_t*), fail); //Note we need at least one pixel more at the end because of the MMX code (just in case someone wanna replace the 4000/8000) /* align at 16 bytes for AltiVec */ for (i=0; i<c->vLumBufSize; i++) { FF_ALLOCZ_OR_GOTO(c, c->lumPixBuf[i+c->vLumBufSize], dst_stride+1, fail); c->lumPixBuf[i] = c->lumPixBuf[i+c->vLumBufSize]; } c->uv_off_px = dst_stride_px; c->uv_off_byte = dst_stride; for (i=0; i<c->vChrBufSize; i++) { FF_ALLOC_OR_GOTO(c, c->chrUPixBuf[i+c->vChrBufSize], dst_stride*2+1, fail); c->chrUPixBuf[i] = c->chrUPixBuf[i+c->vChrBufSize]; c->chrVPixBuf[i] = c->chrVPixBuf[i+c->vChrBufSize] = c->chrUPixBuf[i] + (dst_stride >> 1); } if (CONFIG_SWSCALE_ALPHA && c->alpPixBuf) for (i=0; i<c->vLumBufSize; i++) { FF_ALLOCZ_OR_GOTO(c, c->alpPixBuf[i+c->vLumBufSize], dst_stride+1, fail); c->alpPixBuf[i] = c->alpPixBuf[i+c->vLumBufSize]; } //try to avoid drawing green stuff between the right end and the stride end for (i=0; i<c->vChrBufSize; i++) memset(c->chrUPixBuf[i], 64, dst_stride*2+1); assert(c->chrDstH <= dstH); if (flags&SWS_PRINT_INFO) { if (flags&SWS_FAST_BILINEAR) av_log(c, AV_LOG_INFO, "FAST_BILINEAR scaler, "); else if (flags&SWS_BILINEAR) av_log(c, AV_LOG_INFO, "BILINEAR scaler, "); else if (flags&SWS_BICUBIC) av_log(c, AV_LOG_INFO, "BICUBIC scaler, "); else if (flags&SWS_X) av_log(c, AV_LOG_INFO, "Experimental scaler, "); else if (flags&SWS_POINT) av_log(c, AV_LOG_INFO, "Nearest Neighbor / POINT scaler, "); else if (flags&SWS_AREA) av_log(c, AV_LOG_INFO, "Area Averaging scaler, "); else if (flags&SWS_BICUBLIN) av_log(c, AV_LOG_INFO, "luma BICUBIC / chroma BILINEAR scaler, "); else if (flags&SWS_GAUSS) av_log(c, AV_LOG_INFO, "Gaussian scaler, "); else if (flags&SWS_SINC) av_log(c, AV_LOG_INFO, "Sinc scaler, "); else if (flags&SWS_LANCZOS) av_log(c, AV_LOG_INFO, "Lanczos scaler, "); else if (flags&SWS_SPLINE) av_log(c, AV_LOG_INFO, "Bicubic spline scaler, "); else av_log(c, AV_LOG_INFO, "ehh flags invalid?! "); av_log(c, AV_LOG_INFO, "from %s to %s%s ", sws_format_name(srcFormat), #ifdef DITHER1XBPP dstFormat == PIX_FMT_BGR555 || dstFormat == PIX_FMT_BGR565 || dstFormat == PIX_FMT_RGB444BE || dstFormat == PIX_FMT_RGB444LE || dstFormat == PIX_FMT_BGR444BE || dstFormat == PIX_FMT_BGR444LE ? "dithered " : "", #else "", #endif sws_format_name(dstFormat)); if (HAVE_MMX2 && cpu_flags & AV_CPU_FLAG_MMX2) av_log(c, AV_LOG_INFO, "using MMX2\n"); else if (HAVE_AMD3DNOW && cpu_flags & AV_CPU_FLAG_3DNOW) av_log(c, AV_LOG_INFO, "using 3DNOW\n"); else if (HAVE_MMX && cpu_flags & AV_CPU_FLAG_MMX) av_log(c, AV_LOG_INFO, "using MMX\n"); else if (HAVE_ALTIVEC && cpu_flags & AV_CPU_FLAG_ALTIVEC) av_log(c, AV_LOG_INFO, "using AltiVec\n"); else av_log(c, AV_LOG_INFO, "using C\n"); if (HAVE_MMX && cpu_flags & AV_CPU_FLAG_MMX) { if (c->canMMX2BeUsed && (flags&SWS_FAST_BILINEAR)) av_log(c, AV_LOG_VERBOSE, "using FAST_BILINEAR MMX2 scaler for horizontal scaling\n"); else { if (c->hLumFilterSize==4) av_log(c, AV_LOG_VERBOSE, "using 4-tap MMX scaler for horizontal luminance scaling\n"); else if (c->hLumFilterSize==8) av_log(c, AV_LOG_VERBOSE, "using 8-tap MMX scaler for horizontal luminance scaling\n"); else av_log(c, AV_LOG_VERBOSE, "using n-tap MMX scaler for horizontal luminance scaling\n"); if (c->hChrFilterSize==4) av_log(c, AV_LOG_VERBOSE, "using 4-tap MMX scaler for horizontal chrominance scaling\n"); else if (c->hChrFilterSize==8) av_log(c, AV_LOG_VERBOSE, "using 8-tap MMX scaler for horizontal chrominance scaling\n"); else av_log(c, AV_LOG_VERBOSE, "using n-tap MMX scaler for horizontal chrominance scaling\n"); } } else { #if HAVE_MMX av_log(c, AV_LOG_VERBOSE, "using x86 asm scaler for horizontal scaling\n"); #else if (flags & SWS_FAST_BILINEAR) av_log(c, AV_LOG_VERBOSE, "using FAST_BILINEAR C scaler for horizontal scaling\n"); else av_log(c, AV_LOG_VERBOSE, "using C scaler for horizontal scaling\n"); #endif } if (isPlanarYUV(dstFormat)) { if (c->vLumFilterSize==1) av_log(c, AV_LOG_VERBOSE, "using 1-tap %s \"scaler\" for vertical scaling (YV12 like)\n", (HAVE_MMX && cpu_flags & AV_CPU_FLAG_MMX) ? "MMX" : "C"); else av_log(c, AV_LOG_VERBOSE, "using n-tap %s scaler for vertical scaling (YV12 like)\n", (HAVE_MMX && cpu_flags & AV_CPU_FLAG_MMX) ? "MMX" : "C"); } else { if (c->vLumFilterSize==1 && c->vChrFilterSize==2) av_log(c, AV_LOG_VERBOSE, "using 1-tap %s \"scaler\" for vertical luminance scaling (BGR)\n" " 2-tap scaler for vertical chrominance scaling (BGR)\n", (HAVE_MMX && cpu_flags & AV_CPU_FLAG_MMX) ? "MMX" : "C"); else if (c->vLumFilterSize==2 && c->vChrFilterSize==2) av_log(c, AV_LOG_VERBOSE, "using 2-tap linear %s scaler for vertical scaling (BGR)\n", (HAVE_MMX && cpu_flags & AV_CPU_FLAG_MMX) ? "MMX" : "C"); else av_log(c, AV_LOG_VERBOSE, "using n-tap %s scaler for vertical scaling (BGR)\n", (HAVE_MMX && cpu_flags & AV_CPU_FLAG_MMX) ? "MMX" : "C"); } if (dstFormat==PIX_FMT_BGR24) av_log(c, AV_LOG_VERBOSE, "using %s YV12->BGR24 converter\n", (HAVE_MMX2 && cpu_flags & AV_CPU_FLAG_MMX2) ? "MMX2" : ((HAVE_MMX && cpu_flags & AV_CPU_FLAG_MMX) ? "MMX" : "C")); else if (dstFormat==PIX_FMT_RGB32) av_log(c, AV_LOG_VERBOSE, "using %s YV12->BGR32 converter\n", (HAVE_MMX && cpu_flags & AV_CPU_FLAG_MMX) ? "MMX" : "C"); else if (dstFormat==PIX_FMT_BGR565) av_log(c, AV_LOG_VERBOSE, "using %s YV12->BGR16 converter\n", (HAVE_MMX && cpu_flags & AV_CPU_FLAG_MMX) ? "MMX" : "C"); else if (dstFormat==PIX_FMT_BGR555) av_log(c, AV_LOG_VERBOSE, "using %s YV12->BGR15 converter\n", (HAVE_MMX && cpu_flags & AV_CPU_FLAG_MMX) ? "MMX" : "C"); else if (dstFormat == PIX_FMT_RGB444BE || dstFormat == PIX_FMT_RGB444LE || dstFormat == PIX_FMT_BGR444BE || dstFormat == PIX_FMT_BGR444LE) av_log(c, AV_LOG_VERBOSE, "using %s YV12->BGR12 converter\n", (HAVE_MMX && cpu_flags & AV_CPU_FLAG_MMX) ? "MMX" : "C"); av_log(c, AV_LOG_VERBOSE, "%dx%d -> %dx%d\n", srcW, srcH, dstW, dstH); av_log(c, AV_LOG_DEBUG, "lum srcW=%d srcH=%d dstW=%d dstH=%d xInc=%d yInc=%d\n", c->srcW, c->srcH, c->dstW, c->dstH, c->lumXInc, c->lumYInc); av_log(c, AV_LOG_DEBUG, "chr srcW=%d srcH=%d dstW=%d dstH=%d xInc=%d yInc=%d\n", c->chrSrcW, c->chrSrcH, c->chrDstW, c->chrDstH, c->chrXInc, c->chrYInc); } c->swScale= ff_getSwsFunc(c); return 0; fail: //FIXME replace things by appropriate error codes return -1; }
int sws_init_context(SwsContext *c, SwsFilter *srcFilter, SwsFilter *dstFilter) { int i; int usesVFilter, usesHFilter; int unscaled; SwsFilter dummyFilter= {NULL, NULL, NULL, NULL}; int srcW= c->srcW; int srcH= c->srcH; int dstW= c->dstW; int dstH= c->dstH; int dst_stride = FFALIGN(dstW * sizeof(int16_t) + 16, 16), dst_stride_px = dst_stride >> 1; int flags, cpu_flags; enum PixelFormat srcFormat= c->srcFormat; enum PixelFormat dstFormat= c->dstFormat; cpu_flags = av_get_cpu_flags(); flags = c->flags; emms_c(); if (!rgb15to16) sws_rgb2rgb_init(); unscaled = (srcW == dstW && srcH == dstH); if (!isSupportedIn(srcFormat)) { av_log(c, AV_LOG_ERROR, "%s is not supported as input pixel format\n", sws_format_name(srcFormat)); return AVERROR(EINVAL); } if (!isSupportedOut(dstFormat)) { av_log(c, AV_LOG_ERROR, "%s is not supported as output pixel format\n", sws_format_name(dstFormat)); return AVERROR(EINVAL); } i= flags & ( SWS_POINT |SWS_AREA |SWS_BILINEAR |SWS_FAST_BILINEAR |SWS_BICUBIC |SWS_X |SWS_GAUSS |SWS_LANCZOS |SWS_SINC |SWS_SPLINE |SWS_BICUBLIN); if(!i || (i & (i-1))) { av_log(c, AV_LOG_ERROR, "Exactly one scaler algorithm must be chosen\n"); return AVERROR(EINVAL); }   if (srcW<4 || srcH<1 || dstW<8 || dstH<1) {  