making act segmenter

1 files changed, 1882 insertions, 0 deletions

diff --git a/ffmpeg/libswscale/utils.c b/ffmpeg/libswscale/utils.c
new file mode 100644
index 0000000..932cf94
--- /dev/null
+++ b/ffmpeg/libswscale/utils.c
@@ -0,0 +1,1882 @@
+/*
+ * Copyright (C) 2001-2003 Michael Niedermayer <michaelni@gmx.at>
+ *
+ * This file is part of FFmpeg.
+ *
+ * FFmpeg is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * FFmpeg is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with FFmpeg; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#include "config.h"
+
+#define _SVID_SOURCE // needed for MAP_ANONYMOUS
+#define _DARWIN_C_SOURCE // needed for MAP_ANON
+#include <inttypes.h>
+#include <math.h>
+#include <stdio.h>
+#include <string.h>
+#if HAVE_SYS_MMAN_H
+#include <sys/mman.h>
+#if defined(MAP_ANON) && !defined(MAP_ANONYMOUS)
+#define MAP_ANONYMOUS MAP_ANON
+#endif
+#endif
+#if HAVE_VIRTUALALLOC
+#define WIN32_LEAN_AND_MEAN
+#include <windows.h>
+#endif
+
+#include "libavutil/attributes.h"
+#include "libavutil/avassert.h"
+#include "libavutil/avutil.h"
+#include "libavutil/bswap.h"
+#include "libavutil/cpu.h"
+#include "libavutil/intreadwrite.h"
+#include "libavutil/mathematics.h"
+#include "libavutil/opt.h"
+#include "libavutil/pixdesc.h"
+#include "libavutil/x86/asm.h"
+#include "libavutil/x86/cpu.h"
+#include "rgb2rgb.h"
+#include "swscale.h"
+#include "swscale_internal.h"
+
+unsigned swscale_version(void)
+{
+    av_assert0(LIBSWSCALE_VERSION_MICRO >= 100);
+    return LIBSWSCALE_VERSION_INT;
+}
+
+const char *swscale_configuration(void)
+{
+    return FFMPEG_CONFIGURATION;
+}
+
+const char *swscale_license(void)
+{
+#define LICENSE_PREFIX "libswscale license: "
+    return LICENSE_PREFIX FFMPEG_LICENSE + sizeof(LICENSE_PREFIX) - 1;
+}
+
+#define RET 0xC3 // near return opcode for x86
+
+typedef struct FormatEntry {
+    int is_supported_in, is_supported_out;
+} FormatEntry;
+
+static const FormatEntry format_entries[AV_PIX_FMT_NB] = {
+    [AV_PIX_FMT_YUV420P]     = { 1, 1 },
+    [AV_PIX_FMT_YUYV422]     = { 1, 1 },
+    [AV_PIX_FMT_RGB24]       = { 1, 1 },
+    [AV_PIX_FMT_BGR24]       = { 1, 1 },
+    [AV_PIX_FMT_YUV422P]     = { 1, 1 },
+    [AV_PIX_FMT_YUV444P]     = { 1, 1 },
+    [AV_PIX_FMT_YUV410P]     = { 1, 1 },
+    [AV_PIX_FMT_YUV411P]     = { 1, 1 },
+    [AV_PIX_FMT_GRAY8]       = { 1, 1 },
+    [AV_PIX_FMT_MONOWHITE]   = { 1, 1 },
+    [AV_PIX_FMT_MONOBLACK]   = { 1, 1 },
+    [AV_PIX_FMT_PAL8]        = { 1, 0 },
+    [AV_PIX_FMT_YUVJ420P]    = { 1, 1 },
+    [AV_PIX_FMT_YUVJ422P]    = { 1, 1 },
+    [AV_PIX_FMT_YUVJ444P]    = { 1, 1 },
+    [AV_PIX_FMT_UYVY422]     = { 1, 1 },
+    [AV_PIX_FMT_UYYVYY411]   = { 0, 0 },
+    [AV_PIX_FMT_BGR8]        = { 1, 1 },
+    [AV_PIX_FMT_BGR4]        = { 0, 1 },
+    [AV_PIX_FMT_BGR4_BYTE]   = { 1, 1 },
+    [AV_PIX_FMT_RGB8]        = { 1, 1 },
+    [AV_PIX_FMT_RGB4]        = { 0, 1 },
+    [AV_PIX_FMT_RGB4_BYTE]   = { 1, 1 },
+    [AV_PIX_FMT_NV12]        = { 1, 1 },
+    [AV_PIX_FMT_NV21]        = { 1, 1 },
+    [AV_PIX_FMT_ARGB]        = { 1, 1 },
+    [AV_PIX_FMT_RGBA]        = { 1, 1 },
+    [AV_PIX_FMT_ABGR]        = { 1, 1 },
+    [AV_PIX_FMT_BGRA]        = { 1, 1 },
+    [AV_PIX_FMT_0RGB]        = { 1, 1 },
+    [AV_PIX_FMT_RGB0]        = { 1, 1 },
+    [AV_PIX_FMT_0BGR]        = { 1, 1 },
+    [AV_PIX_FMT_BGR0]        = { 1, 1 },
+    [AV_PIX_FMT_GRAY16BE]    = { 1, 1 },
+    [AV_PIX_FMT_GRAY16LE]    = { 1, 1 },
+    [AV_PIX_FMT_YUV440P]     = { 1, 1 },
+    [AV_PIX_FMT_YUVJ440P]    = { 1, 1 },
+    [AV_PIX_FMT_YUVA420P]    = { 1, 1 },
+    [AV_PIX_FMT_YUVA422P]    = { 1, 1 },
+    [AV_PIX_FMT_YUVA444P]    = { 1, 1 },
+    [AV_PIX_FMT_YUVA420P9BE] = { 1, 1 },
+    [AV_PIX_FMT_YUVA420P9LE] = { 1, 1 },
+    [AV_PIX_FMT_YUVA422P9BE] = { 1, 1 },
+    [AV_PIX_FMT_YUVA422P9LE] = { 1, 1 },
+    [AV_PIX_FMT_YUVA444P9BE] = { 1, 1 },
+    [AV_PIX_FMT_YUVA444P9LE] = { 1, 1 },
+    [AV_PIX_FMT_YUVA420P10BE]= { 1, 1 },
+    [AV_PIX_FMT_YUVA420P10LE]= { 1, 1 },
+    [AV_PIX_FMT_YUVA422P10BE]= { 1, 1 },
+    [AV_PIX_FMT_YUVA422P10LE]= { 1, 1 },
+    [AV_PIX_FMT_YUVA444P10BE]= { 1, 1 },
+    [AV_PIX_FMT_YUVA444P10LE]= { 1, 1 },
+    [AV_PIX_FMT_YUVA420P16BE]= { 1, 1 },
+    [AV_PIX_FMT_YUVA420P16LE]= { 1, 1 },
+    [AV_PIX_FMT_YUVA422P16BE]= { 1, 1 },
+    [AV_PIX_FMT_YUVA422P16LE]= { 1, 1 },
+    [AV_PIX_FMT_YUVA444P16BE]= { 1, 1 },
+    [AV_PIX_FMT_YUVA444P16LE]= { 1, 1 },
+    [AV_PIX_FMT_RGB48BE]     = { 1, 1 },
+    [AV_PIX_FMT_RGB48LE]     = { 1, 1 },
+    [AV_PIX_FMT_RGBA64BE]    = { 1, 0 },
+    [AV_PIX_FMT_RGBA64LE]    = { 1, 0 },
+    [AV_PIX_FMT_RGB565BE]    = { 1, 1 },
+    [AV_PIX_FMT_RGB565LE]    = { 1, 1 },
+    [AV_PIX_FMT_RGB555BE]    = { 1, 1 },
+    [AV_PIX_FMT_RGB555LE]    = { 1, 1 },
+    [AV_PIX_FMT_BGR565BE]    = { 1, 1 },
+    [AV_PIX_FMT_BGR565LE]    = { 1, 1 },
+    [AV_PIX_FMT_BGR555BE]    = { 1, 1 },
+    [AV_PIX_FMT_BGR555LE]    = { 1, 1 },
+    [AV_PIX_FMT_YUV420P16LE] = { 1, 1 },
+    [AV_PIX_FMT_YUV420P16BE] = { 1, 1 },
+    [AV_PIX_FMT_YUV422P16LE] = { 1, 1 },
+    [AV_PIX_FMT_YUV422P16BE] = { 1, 1 },
+    [AV_PIX_FMT_YUV444P16LE] = { 1, 1 },
+    [AV_PIX_FMT_YUV444P16BE] = { 1, 1 },
+    [AV_PIX_FMT_RGB444LE]    = { 1, 1 },
+    [AV_PIX_FMT_RGB444BE]    = { 1, 1 },
+    [AV_PIX_FMT_BGR444LE]    = { 1, 1 },
+    [AV_PIX_FMT_BGR444BE]    = { 1, 1 },
+    [AV_PIX_FMT_Y400A]       = { 1, 0 },
+    [AV_PIX_FMT_BGR48BE]     = { 1, 1 },
+    [AV_PIX_FMT_BGR48LE]     = { 1, 1 },
+    [AV_PIX_FMT_BGRA64BE]    = { 0, 0 },
+    [AV_PIX_FMT_BGRA64LE]    = { 0, 0 },
+    [AV_PIX_FMT_YUV420P9BE]  = { 1, 1 },
+    [AV_PIX_FMT_YUV420P9LE]  = { 1, 1 },
+    [AV_PIX_FMT_YUV420P10BE] = { 1, 1 },
+    [AV_PIX_FMT_YUV420P10LE] = { 1, 1 },
+    [AV_PIX_FMT_YUV420P12BE] = { 1, 1 },
+    [AV_PIX_FMT_YUV420P12LE] = { 1, 1 },
+    [AV_PIX_FMT_YUV420P14BE] = { 1, 1 },
+    [AV_PIX_FMT_YUV420P14LE] = { 1, 1 },
+    [AV_PIX_FMT_YUV422P9BE]  = { 1, 1 },
+    [AV_PIX_FMT_YUV422P9LE]  = { 1, 1 },
+    [AV_PIX_FMT_YUV422P10BE] = { 1, 1 },
+    [AV_PIX_FMT_YUV422P10LE] = { 1, 1 },
+    [AV_PIX_FMT_YUV422P12BE] = { 1, 1 },
+    [AV_PIX_FMT_YUV422P12LE] = { 1, 1 },
+    [AV_PIX_FMT_YUV422P14BE] = { 1, 1 },
+    [AV_PIX_FMT_YUV422P14LE] = { 1, 1 },
+    [AV_PIX_FMT_YUV444P9BE]  = { 1, 1 },
+    [AV_PIX_FMT_YUV444P9LE]  = { 1, 1 },
+    [AV_PIX_FMT_YUV444P10BE] = { 1, 1 },
+    [AV_PIX_FMT_YUV444P10LE] = { 1, 1 },
+    [AV_PIX_FMT_YUV444P12BE] = { 1, 1 },
+    [AV_PIX_FMT_YUV444P12LE] = { 1, 1 },
+    [AV_PIX_FMT_YUV444P14BE] = { 1, 1 },
+    [AV_PIX_FMT_YUV444P14LE] = { 1, 1 },
+    [AV_PIX_FMT_GBRP]        = { 1, 1 },
+    [AV_PIX_FMT_GBRP9LE]     = { 1, 1 },
+    [AV_PIX_FMT_GBRP9BE]     = { 1, 1 },
+    [AV_PIX_FMT_GBRP10LE]    = { 1, 1 },
+    [AV_PIX_FMT_GBRP10BE]    = { 1, 1 },
+    [AV_PIX_FMT_GBRP12LE]    = { 1, 1 },
+    [AV_PIX_FMT_GBRP12BE]    = { 1, 1 },
+    [AV_PIX_FMT_GBRP14LE]    = { 1, 1 },
+    [AV_PIX_FMT_GBRP14BE]    = { 1, 1 },
+    [AV_PIX_FMT_GBRP16LE]    = { 1, 0 },
+    [AV_PIX_FMT_GBRP16BE]    = { 1, 0 },
+};
+
+int sws_isSupportedInput(enum AVPixelFormat pix_fmt)
+{
+    return (unsigned)pix_fmt < AV_PIX_FMT_NB ?
+           format_entries[pix_fmt].is_supported_in : 0;
+}
+
+int sws_isSupportedOutput(enum AVPixelFormat pix_fmt)
+{
+    return (unsigned)pix_fmt < AV_PIX_FMT_NB ?
+           format_entries[pix_fmt].is_supported_out : 0;
+}
+
+extern const int32_t ff_yuv2rgb_coeffs[8][4];
+
+#if FF_API_SWS_FORMAT_NAME
+const char *sws_format_name(enum AVPixelFormat format)
+{
+    const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(format);
+    if (desc)
+        return desc->name;
+    else
+        return "Unknown format";
+}
+#endif
+
+static double getSplineCoeff(double a, double b, double c, double d,
+                             double dist)
+{
+    if (dist <= 1.0)
+        return ((d * dist + c) * dist + b) * dist + a;
+    else
+        return getSplineCoeff(0.0,
+                               b + 2.0 * c + 3.0 * d,
+                               c + 3.0 * d,
+                              -b - 3.0 * c - 6.0 * d,
+                              dist - 1.0);
+}
+
+static int initFilter(int16_t **outFilter, int32_t **filterPos,
+                      int *outFilterSize, int xInc, int srcW, int dstW,
+                      int filterAlign, int one, int flags, int cpu_flags,
+                      SwsVector *srcFilter, SwsVector *dstFilter,
+                      double param[2])
+{
+    int i;
+    int filterSize;
+    int filter2Size;
+    int minFilterSize;
+    int64_t *filter    = NULL;
+    int64_t *filter2   = NULL;
+    const int64_t fone = 1LL << (54 - FFMIN(av_log2(srcW/dstW), 8));
+    int ret            = -1;
+
+    emms_c(); // FIXME should not be required but IS (even for non-MMX versions)
+
+    // NOTE: the +3 is for the MMX(+1) / SSE(+3) scaler which reads over the end
+    FF_ALLOC_OR_GOTO(NULL, *filterPos, (dstW + 3) * sizeof(**filterPos), fail);
+
+    if (FFABS(xInc - 0x10000) < 10) { // unscaled
+        int i;
+        filterSize = 1;
+        FF_ALLOCZ_OR_GOTO(NULL, filter,
+                          dstW * sizeof(*filter) * filterSize, fail);
+
+        for (i = 0; i < dstW; i++) {
+            filter[i * filterSize] = fone;
+            (*filterPos)[i]        = i;
+        }
+    } else if (flags & SWS_POINT) { // lame looking point sampling mode
+        int i;
+        int64_t xDstInSrc;
+        filterSize = 1;
+        FF_ALLOC_OR_GOTO(NULL, filter,
+                         dstW * sizeof(*filter) * filterSize, fail);
+
+        xDstInSrc = xInc / 2 - 0x8000;
+        for (i = 0; i < dstW; i++) {
+            int xx = (xDstInSrc - ((filterSize - 1) << 15) + (1 << 15)) >> 16;
+
+            (*filterPos)[i] = xx;
+            filter[i]       = fone;
+            xDstInSrc      += xInc;
+        }
+    } else if ((xInc <= (1 << 16) && (flags & SWS_AREA)) ||
+               (flags & SWS_FAST_BILINEAR)) { // bilinear upscale
+        int i;
+        int64_t xDstInSrc;
+        filterSize = 2;
+        FF_ALLOC_OR_GOTO(NULL, filter,
+                         dstW * sizeof(*filter) * filterSize, fail);
+
+        xDstInSrc = xInc / 2 - 0x8000;
+        for (i = 0; i < dstW; i++) {
+            int xx = (xDstInSrc - ((filterSize - 1) << 15) + (1 << 15)) >> 16;
+            int j;
+
+            (*filterPos)[i] = xx;
+            // bilinear upscale / linear interpolate / area averaging
+            for (j = 0; j < filterSize; j++) {
+                int64_t coeff= fone - FFABS(((int64_t)xx<<16) - xDstInSrc)*(fone>>16);
+                if (coeff < 0)
+                    coeff = 0;
+                filter[i * filterSize + j] = coeff;
+                xx++;
+            }
+            xDstInSrc += xInc;
+        }
+    } else {
+        int64_t xDstInSrc;
+        int sizeFactor;
+
+        if (flags & SWS_BICUBIC)
+            sizeFactor = 4;
+        else if (flags & SWS_X)
+            sizeFactor = 8;
+        else if (flags & SWS_AREA)
+            sizeFactor = 1;     // downscale only, for upscale it is bilinear
+        else if (flags & SWS_GAUSS)
+            sizeFactor = 8;     // infinite ;)
+        else if (flags & SWS_LANCZOS)
+            sizeFactor = param[0] != SWS_PARAM_DEFAULT ? ceil(2 * param[0]) : 6;
+        else if (flags & SWS_SINC)
+            sizeFactor = 20;    // infinite ;)
+        else if (flags & SWS_SPLINE)
+            sizeFactor = 20;    // infinite ;)
+        else if (flags & SWS_BILINEAR)
+            sizeFactor = 2;
+        else {
+            av_assert0(0);
+        }
+
+        if (xInc <= 1 << 16)
+            filterSize = 1 + sizeFactor;    // upscale
+        else
+            filterSize = 1 + (sizeFactor * srcW + dstW - 1) / dstW;
+
+        filterSize = FFMIN(filterSize, srcW - 2);
+        filterSize = FFMAX(filterSize, 1);
+
+        FF_ALLOC_OR_GOTO(NULL, filter,
+                         dstW * sizeof(*filter) * filterSize, fail);
+
+        xDstInSrc = xInc - 0x10000;
+        for (i = 0; i < dstW; i++) {
+            int xx = (xDstInSrc - ((filterSize - 2) << 16)) / (1 << 17);
+            int j;
+            (*filterPos)[i] = xx;
+            for (j = 0; j < filterSize; j++) {
+                int64_t d = (FFABS(((int64_t)xx << 17) - xDstInSrc)) << 13;
+                double floatd;
+                int64_t coeff;
+
+                if (xInc > 1 << 16)
+                    d = d * dstW / srcW;
+                floatd = d * (1.0 / (1 << 30));
+
+                if (flags & SWS_BICUBIC) {
+                    int64_t B = (param[0] != SWS_PARAM_DEFAULT ? param[0] :   0) * (1 << 24);
+                    int64_t C = (param[1] != SWS_PARAM_DEFAULT ? param[1] : 0.6) * (1 << 24);
+
+                    if (d >= 1LL << 31) {
+                        coeff = 0.0;
+                    } else {
+                        int64_t dd  = (d  * d) >> 30;
+                        int64_t ddd = (dd * d) >> 30;
+
+                        if (d < 1LL << 30)
+                            coeff =  (12 * (1 << 24) -  9 * B - 6 * C) * ddd +
+                                    (-18 * (1 << 24) + 12 * B + 6 * C) *  dd +
+                                      (6 * (1 << 24) -  2 * B)         * (1 << 30);
+                        else
+                            coeff =      (-B -  6 * C) * ddd +
+                                      (6 * B + 30 * C) * dd  +
+                                    (-12 * B - 48 * C) * d   +
+                                      (8 * B + 24 * C) * (1 << 30);
+                    }
+                    coeff /= (1LL<<54)/fone;
+                }
+#if 0
+                else if (flags & SWS_X) {
+                    double p  = param ? param * 0.01 : 0.3;
+                    coeff     = d ? sin(d * M_PI) / (d * M_PI) : 1.0;
+                    coeff    *= pow(2.0, -p * d * d);
+                }
+#endif
+                else if (flags & SWS_X) {
+                    double A = param[0] != SWS_PARAM_DEFAULT ? param[0] : 1.0;
+                    double c;
+
+                    if (floatd < 1.0)
+                        c = cos(floatd * M_PI);
+                    else
+                        c = -1.0;
+                    if (c < 0.0)
+                        c = -pow(-c, A);
+                    else
+                        c = pow(c, A);
+                    coeff = (c * 0.5 + 0.5) * fone;
+                } else if (flags & SWS_AREA) {
+                    int64_t d2 = d - (1 << 29);
+                    if (d2 * xInc < -(1LL << (29 + 16)))
+                        coeff = 1.0 * (1LL << (30 + 16));
+                    else if (d2 * xInc < (1LL << (29 + 16)))
+                        coeff = -d2 * xInc + (1LL << (29 + 16));
+                    else
+                        coeff = 0.0;
+                    coeff *= fone >> (30 + 16);
+                } else if (flags & SWS_GAUSS) {
+                    double p = param[0] != SWS_PARAM_DEFAULT ? param[0] : 3.0;
+                    coeff = (pow(2.0, -p * floatd * floatd)) * fone;
+                } else if (flags & SWS_SINC) {
+                    coeff = (d ? sin(floatd * M_PI) / (floatd * M_PI) : 1.0) * fone;
+                } else if (flags & SWS_LANCZOS) {
+                    double p = param[0] != SWS_PARAM_DEFAULT ? param[0] : 3.0;
+                    coeff = (d ? sin(floatd * M_PI) * sin(floatd * M_PI / p) /
+                             (floatd * floatd * M_PI * M_PI / p) : 1.0) * fone;
+                    if (floatd > p)
+                        coeff = 0;
+                } else if (flags & SWS_BILINEAR) {
+                    coeff = (1 << 30) - d;
+                    if (coeff < 0)
+                        coeff = 0;
+                    coeff *= fone >> 30;
+                } else if (flags & SWS_SPLINE) {
+                    double p = -2.196152422706632;
+                    coeff = getSplineCoeff(1.0, 0.0, p, -p - 1.0, floatd) * fone;
+                } else {
+                    av_assert0(0);
+                }
+
+                filter[i * filterSize + j] = coeff;
+                xx++;
+            }
+            xDstInSrc += 2 * xInc;
+        }
+    }
+
+    /* apply src & dst Filter to filter -> filter2
+     * av_free(filter);
+     */
+    av_assert0(filterSize > 0);
+    filter2Size = filterSize;
+    if (srcFilter)
+        filter2Size += srcFilter->length - 1;
+    if (dstFilter)
+        filter2Size += dstFilter->length - 1;
+    av_assert0(filter2Size > 0);
+    FF_ALLOCZ_OR_GOTO(NULL, filter2, filter2Size * dstW * sizeof(*filter2), fail);
+
+    for (i = 0; i < dstW; i++) {
+        int j, k;
+
+        if (srcFilter) {
+            for (k = 0; k < srcFilter->length; k++) {
+                for (j = 0; j < filterSize; j++)
+                    filter2[i * filter2Size + k + j] +=
+                        srcFilter->coeff[k] * filter[i * filterSize + j];
+            }
+        } else {
+            for (j = 0; j < filterSize; j++)
+                filter2[i * filter2Size + j] = filter[i * filterSize + j];
+        }
+        // FIXME dstFilter
+
+        (*filterPos)[i] += (filterSize - 1) / 2 - (filter2Size - 1) / 2;
+    }
+    av_freep(&filter);
+
+    /* try to reduce the filter-size (step1 find size and shift left) */
+    // Assume it is near normalized (*0.5 or *2.0 is OK but * 0.001 is not).
+    minFilterSize = 0;
+    for (i = dstW - 1; i >= 0; i--) {
+        int min = filter2Size;
+        int j;
+        int64_t cutOff = 0.0;
+
+        /* get rid of near zero elements on the left by shifting left */
+        for (j = 0; j < filter2Size; j++) {
+            int k;
+            cutOff += FFABS(filter2[i * filter2Size]);
+
+            if (cutOff > SWS_MAX_REDUCE_CUTOFF * fone)
+                break;
+
+            /* preserve monotonicity because the core can't handle the
+             * filter otherwise */
+            if (i < dstW - 1 && (*filterPos)[i] >= (*filterPos)[i + 1])
+                break;
+
+            // move filter coefficients left
+            for (k = 1; k < filter2Size; k++)
+                filter2[i * filter2Size + k - 1] = filter2[i * filter2Size + k];
+            filter2[i * filter2Size + k - 1] = 0;
+            (*filterPos)[i]++;
+        }
+
+        cutOff = 0;
+        /* count near zeros on the right */
+        for (j = filter2Size - 1; j > 0; j--) {
+            cutOff += FFABS(filter2[i * filter2Size + j]);
+
+            if (cutOff > SWS_MAX_REDUCE_CUTOFF * fone)
+                break;
+            min--;
+        }
+
+        if (min > minFilterSize)
+            minFilterSize = min;
+    }
+
+    if (HAVE_ALTIVEC && cpu_flags & AV_CPU_FLAG_ALTIVEC) {
+        // we can handle the special case 4, so we don't want to go the full 8
+        if (minFilterSize < 5)
+            filterAlign = 4;
+
+        /* We really don't want to waste our time doing useless computation, so
+         * fall back on the scalar C code for very small filters.
+         * Vectorizing is worth it only if you have a decent-sized vector. */
+        if (minFilterSize < 3)
+            filterAlign = 1;
+    }
+
+    if (INLINE_MMX(cpu_flags)) {
+        // special case for unscaled vertical filtering
+        if (minFilterSize == 1 && filterAlign == 2)
+            filterAlign = 1;
+    }
+
+    av_assert0(minFilterSize > 0);
+    filterSize = (minFilterSize + (filterAlign - 1)) & (~(filterAlign - 1));
+    av_assert0(filterSize > 0);
+    filter = av_malloc(filterSize * dstW * sizeof(*filter));
+    if (filterSize >= MAX_FILTER_SIZE * 16 /
+                      ((flags & SWS_ACCURATE_RND) ? APCK_SIZE : 16) || !filter) {
+        av_log(NULL, AV_LOG_ERROR, "sws: filterSize %d is too large, try less extreem scaling or increase MAX_FILTER_SIZE and recompile\n", filterSize);
+        goto fail;
+    }
+    *outFilterSize = filterSize;
+
+    if (flags & SWS_PRINT_INFO)
+        av_log(NULL, AV_LOG_VERBOSE,
+               "SwScaler: reducing / aligning filtersize %d -> %d\n",
+               filter2Size, filterSize);
+    /* try to reduce the filter-size (step2 reduce it) */
+    for (i = 0; i < dstW; i++) {
+        int j;
+
+        for (j = 0; j < filterSize; j++) {
+            if (j >= filter2Size)
+                filter[i * filterSize + j] = 0;
+            else
+                filter[i * filterSize + j] = filter2[i * filter2Size + j];
+            if ((flags & SWS_BITEXACT) && j >= minFilterSize)
+                filter[i * filterSize + j] = 0;
+        }
+    }
+
+    // FIXME try to align filterPos if possible
+
+    // fix borders
+    for (i = 0; i < dstW; i++) {
+        int j;
+        if ((*filterPos)[i] < 0) {
+            // move filter coefficients left to compensate for filterPos
+            for (j = 1; j < filterSize; j++) {
+                int left = FFMAX(j + (*filterPos)[i], 0);
+                filter[i * filterSize + left] += filter[i * filterSize + j];
+                filter[i * filterSize + j]     = 0;
+            }
+            (*filterPos)[i]= 0;
+        }
+
+        if ((*filterPos)[i] + filterSize > srcW) {
+            int shift = (*filterPos)[i] + filterSize - srcW;
+            // move filter coefficients right to compensate for filterPos
+            for (j = filterSize - 2; j >= 0; j--) {
+                int right = FFMIN(j + shift, filterSize - 1);
+                filter[i * filterSize + right] += filter[i * filterSize + j];
+                filter[i * filterSize + j]      = 0;
+            }
+            (*filterPos)[i]= srcW - filterSize;
+        }
+    }
+
+    // Note the +1 is for the MMX scaler which reads over the end
+    /* align at 16 for AltiVec (needed by hScale_altivec_real) */
+    FF_ALLOCZ_OR_GOTO(NULL, *outFilter,
+                      *outFilterSize * (dstW + 3) * sizeof(int16_t), fail);
+
+    /* normalize & store in outFilter */
+    for (i = 0; i < dstW; i++) {
+        int j;
+        int64_t error = 0;
+        int64_t sum   = 0;
+
+        for (j = 0; j < filterSize; j++) {
+            sum += filter[i * filterSize + j];
+        }
+        sum = (sum + one / 2) / one;
+        for (j = 0; j < *outFilterSize; j++) {
+            int64_t v = filter[i * filterSize + j] + error;
+            int intV  = ROUNDED_DIV(v, sum);
+            (*outFilter)[i * (*outFilterSize) + j] = intV;
+            error                                  = v - intV * sum;
+        }
+    }
+
+    (*filterPos)[dstW + 0] =
+    (*filterPos)[dstW + 1] =
+    (*filterPos)[dstW + 2] = (*filterPos)[dstW - 1]; /* the MMX/SSE scaler will
+                                                      * read over the end */
+    for (i = 0; i < *outFilterSize; i++) {
+        int k = (dstW - 1) * (*outFilterSize) + i;
+        (*outFilter)[k + 1 * (*outFilterSize)] =
+        (*outFilter)[k + 2 * (*outFilterSize)] =
+        (*outFilter)[k + 3 * (*outFilterSize)] = (*outFilter)[k];
+    }
+
+    ret = 0;
+
+fail:
+    if(ret < 0)
+        av_log(NULL, AV_LOG_ERROR, "sws: initFilter failed\n");
+    av_free(filter);
+    av_free(filter2);
+    return ret;
+}
+
+#if HAVE_MMXEXT_INLINE
+static int init_hscaler_mmxext(int dstW, int xInc, uint8_t *filterCode,
+                               int16_t *filter, int32_t *filterPos,
+                               int numSplits)
+{
+    uint8_t *fragmentA;
+    x86_reg imm8OfPShufW1A;
+    x86_reg imm8OfPShufW2A;
+    x86_reg fragmentLengthA;
+    uint8_t *fragmentB;
+    x86_reg imm8OfPShufW1B;
+    x86_reg imm8OfPShufW2B;
+    x86_reg fragmentLengthB;
+    int fragmentPos;
+
+    int xpos, i;
+
+    // create an optimized horizontal scaling routine
+    /* This scaler is made of runtime-generated MMXEXT code using specially tuned
+     * pshufw instructions. For every four output pixels, if four input pixels
+     * are enough for the fast bilinear scaling, then a chunk of fragmentB is
+     * used. If five input pixels are needed, then a chunk of fragmentA is used.
+     */
+
+    // code fragment
+
+    __asm__ volatile (
+        "jmp                         9f                 \n\t"
+        // Begin
+        "0:                                             \n\t"
+        "movq    (%%"REG_d", %%"REG_a"), %%mm3          \n\t"
+        "movd    (%%"REG_c", %%"REG_S"), %%mm0          \n\t"
+        "movd   1(%%"REG_c", %%"REG_S"), %%mm1          \n\t"
+        "punpcklbw                %%mm7, %%mm1          \n\t"
+        "punpcklbw                %%mm7, %%mm0          \n\t"
+        "pshufw                   $0xFF, %%mm1, %%mm1   \n\t"
+        "1:                                             \n\t"
+        "pshufw                   $0xFF, %%mm0, %%mm0   \n\t"
+        "2:                                             \n\t"
+        "psubw                    %%mm1, %%mm0          \n\t"
+        "movl   8(%%"REG_b", %%"REG_a"), %%esi          \n\t"
+        "pmullw                   %%mm3, %%mm0          \n\t"
+        "psllw                       $7, %%mm1          \n\t"
+        "paddw                    %%mm1, %%mm0          \n\t"
+
+        "movq                     %%mm0, (%%"REG_D", %%"REG_a") \n\t"
+
+        "add                         $8, %%"REG_a"      \n\t"
+        // End
+        "9:                                             \n\t"
+        // "int $3                                         \n\t"
+        "lea       " LOCAL_MANGLE(0b) ", %0             \n\t"
+        "lea       " LOCAL_MANGLE(1b) ", %1             \n\t"
+        "lea       " LOCAL_MANGLE(2b) ", %2             \n\t"
+        "dec                         %1                 \n\t"
+        "dec                         %2                 \n\t"
+        "sub                         %0, %1             \n\t"
+        "sub                         %0, %2             \n\t"
+        "lea       " LOCAL_MANGLE(9b) ", %3             \n\t"
+        "sub                         %0, %3             \n\t"
+
+
+        : "=r" (fragmentA), "=r" (imm8OfPShufW1A), "=r" (imm8OfPShufW2A),
+          "=r" (fragmentLengthA)
+        );
+
+    __asm__ volatile (
+        "jmp                         9f                 \n\t"
+        // Begin
+        "0:                                             \n\t"
+        "movq    (%%"REG_d", %%"REG_a"), %%mm3          \n\t"
+        "movd    (%%"REG_c", %%"REG_S"), %%mm0          \n\t"
+        "punpcklbw                %%mm7, %%mm0          \n\t"
+        "pshufw                   $0xFF, %%mm0, %%mm1   \n\t"
+        "1:                                             \n\t"
+        "pshufw                   $0xFF, %%mm0, %%mm0   \n\t"
+        "2:                                             \n\t"
+        "psubw                    %%mm1, %%mm0          \n\t"
+        "movl   8(%%"REG_b", %%"REG_a"), %%esi          \n\t"
+        "pmullw                   %%mm3, %%mm0          \n\t"
+        "psllw                       $7, %%mm1          \n\t"
+        "paddw                    %%mm1, %%mm0          \n\t"
+
+        "movq                     %%mm0, (%%"REG_D", %%"REG_a") \n\t"
+
+        "add                         $8, %%"REG_a"      \n\t"
+        // End
+        "9:                                             \n\t"
+        // "int                       $3                   \n\t"
+        "lea       " LOCAL_MANGLE(0b) ", %0             \n\t"
+        "lea       " LOCAL_MANGLE(1b) ", %1             \n\t"
+        "lea       " LOCAL_MANGLE(2b) ", %2             \n\t"
+        "dec                         %1                 \n\t"
+        "dec                         %2                 \n\t"
+        "sub                         %0, %1             \n\t"
+        "sub                         %0, %2             \n\t"
+        "lea       " LOCAL_MANGLE(9b) ", %3             \n\t"
+        "sub                         %0, %3             \n\t"
+
+
+        : "=r" (fragmentB), "=r" (imm8OfPShufW1B), "=r" (imm8OfPShufW2B),
+          "=r" (fragmentLengthB)
+        );
+
+    xpos        = 0; // lumXInc/2 - 0x8000; // difference between pixel centers
+    fragmentPos = 0;
+
+    for (i = 0; i < dstW / numSplits; i++) {
+        int xx = xpos >> 16;
+
+        if ((i & 3) == 0) {
+            int a                  = 0;
+            int b                  = ((xpos + xInc) >> 16) - xx;
+            int c                  = ((xpos + xInc * 2) >> 16) - xx;
+            int d                  = ((xpos + xInc * 3) >> 16) - xx;
+            int inc                = (d + 1 < 4);
+            uint8_t *fragment      = (d + 1 < 4) ? fragmentB : fragmentA;
+            x86_reg imm8OfPShufW1  = (d + 1 < 4) ? imm8OfPShufW1B : imm8OfPShufW1A;
+            x86_reg imm8OfPShufW2  = (d + 1 < 4) ? imm8OfPShufW2B : imm8OfPShufW2A;
+            x86_reg fragmentLength = (d + 1 < 4) ? fragmentLengthB : fragmentLengthA;
+            int maxShift           = 3 - (d + inc);
+            int shift              = 0;
+
+            if (filterCode) {
+                filter[i]        = ((xpos              & 0xFFFF) ^ 0xFFFF) >> 9;
+                filter[i + 1]    = (((xpos + xInc)     & 0xFFFF) ^ 0xFFFF) >> 9;
+                filter[i + 2]    = (((xpos + xInc * 2) & 0xFFFF) ^ 0xFFFF) >> 9;
+                filter[i + 3]    = (((xpos + xInc * 3) & 0xFFFF) ^ 0xFFFF) >> 9;
+                filterPos[i / 2] = xx;
+
+                memcpy(filterCode + fragmentPos, fragment, fragmentLength);
+
+                filterCode[fragmentPos + imm8OfPShufW1] =  (a + inc)       |
+                                                          ((b + inc) << 2) |
+                                                          ((c + inc) << 4) |
+                                                          ((d + inc) << 6);
+                filterCode[fragmentPos + imm8OfPShufW2] =  a | (b << 2) |
+                                                               (c << 4) |
+                                                               (d << 6);
+
+                if (i + 4 - inc >= dstW)
+                    shift = maxShift;               // avoid overread
+                else if ((filterPos[i / 2] & 3) <= maxShift)
+                    shift = filterPos[i / 2] & 3;   // align
+
+                if (shift && i >= shift) {
+                    filterCode[fragmentPos + imm8OfPShufW1] += 0x55 * shift;
+                    filterCode[fragmentPos + imm8OfPShufW2] += 0x55 * shift;
+                    filterPos[i / 2]                        -= shift;
+                }
+            }
+
+            fragmentPos += fragmentLength;
+
+            if (filterCode)
+                filterCode[fragmentPos] = RET;
+        }
+        xpos += xInc;
+    }
+    if (filterCode)
+        filterPos[((i / 2) + 1) & (~1)] = xpos >> 16;  // needed to jump to the next part
+
+    return fragmentPos + 1;
+}
+#endif /* HAVE_MMXEXT_INLINE */
+
+static void getSubSampleFactors(int *h, int *v, enum AVPixelFormat format)
+{
+    const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(format);
+    *h = desc->log2_chroma_w;
+    *v = desc->log2_chroma_h;
+}
+
+int sws_setColorspaceDetails(struct SwsContext *c, const int inv_table[4],
+                             int srcRange, const int table[4], int dstRange,
+                             int brightness, int contrast, int saturation)
+{
+    const AVPixFmtDescriptor *desc_dst = av_pix_fmt_desc_get(c->dstFormat);
+    const AVPixFmtDescriptor *desc_src = av_pix_fmt_desc_get(c->srcFormat);
+    memcpy(c->srcColorspaceTable, inv_table, sizeof(int) * 4);
+    memcpy(c->dstColorspaceTable, table, sizeof(int) * 4);
+
+    if(!isYUV(c->dstFormat) && !isGray(c->dstFormat))
+        dstRange = 0;
+    if(!isYUV(c->srcFormat) && !isGray(c->srcFormat))
+        srcRange = 0;
+
+    c->brightness = brightness;
+    c->contrast   = contrast;
+    c->saturation = saturation;
+    c->srcRange   = srcRange;
+    c->dstRange   = dstRange;
+
+    if (isYUV(c->dstFormat) || isGray(c->dstFormat))
+        return -1;
+
+    c->dstFormatBpp = av_get_bits_per_pixel(desc_dst);
+    c->srcFormatBpp = av_get_bits_per_pixel(desc_src);
+
+    ff_yuv2rgb_c_init_tables(c, inv_table, srcRange, brightness,
+                             contrast, saturation);
+    // FIXME factorize
+
+    if (HAVE_ALTIVEC && av_get_cpu_flags() & AV_CPU_FLAG_ALTIVEC)
+        ff_yuv2rgb_init_tables_altivec(c, inv_table, brightness,
+                                       contrast, saturation);
+    return 0;
+}
+
+int sws_getColorspaceDetails(struct SwsContext *c, int **inv_table,
+                             int *srcRange, int **table, int *dstRange,
+                             int *brightness, int *contrast, int *saturation)
+{
+    if (!c || isYUV(c->dstFormat) || isGray(c->dstFormat))
+        return -1;
+
+    *inv_table  = c->srcColorspaceTable;
+    *table      = c->dstColorspaceTable;
+    *srcRange   = c->srcRange;
+    *dstRange   = c->dstRange;
+    *brightness = c->brightness;
+    *contrast   = c->contrast;
+    *saturation = c->saturation;
+
+    return 0;
+}
+
+static int handle_jpeg(enum AVPixelFormat *format)
+{
+    switch (*format) {
+    case AV_PIX_FMT_YUVJ420P:
+        *format = AV_PIX_FMT_YUV420P;
+        return 1;
+    case AV_PIX_FMT_YUVJ422P:
+        *format = AV_PIX_FMT_YUV422P;
+        return 1;
+    case AV_PIX_FMT_YUVJ444P:
+        *format = AV_PIX_FMT_YUV444P;
+        return 1;
+    case AV_PIX_FMT_YUVJ440P:
+        *format = AV_PIX_FMT_YUV440P;
+        return 1;
+    default:
+        return 0;
+    }
+}
+
+static int handle_0alpha(enum AVPixelFormat *format)
+{
+    switch (*format) {
+    case AV_PIX_FMT_0BGR    : *format = AV_PIX_FMT_ABGR   ; return 1;
+    case AV_PIX_FMT_BGR0    : *format = AV_PIX_FMT_BGRA   ; return 4;
+    case AV_PIX_FMT_0RGB    : *format = AV_PIX_FMT_ARGB   ; return 1;
+    case AV_PIX_FMT_RGB0    : *format = AV_PIX_FMT_RGBA   ; return 4;
+    default:                                          return 0;
+    }
+}
+
+SwsContext *sws_alloc_context(void)
+{
+    SwsContext *c = av_mallocz(sizeof(SwsContext));
+
+    if (c) {
+        c->av_class = &sws_context_class;
+        av_opt_set_defaults(c);
+    }
+
+    return c;
+}
+
+av_cold int sws_init_context(SwsContext *c, SwsFilter *srcFilter,
+                             SwsFilter *dstFilter)
+{
+    int i, j;
+    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) + 66, 16);
+    int flags, cpu_flags;
+    enum AVPixelFormat srcFormat = c->srcFormat;
+    enum AVPixelFormat dstFormat = c->dstFormat;
+    const AVPixFmtDescriptor *desc_src = av_pix_fmt_desc_get(srcFormat);
+    const AVPixFmtDescriptor *desc_dst = av_pix_fmt_desc_get(dstFormat);
+
+    cpu_flags = av_get_cpu_flags();
+    flags     = c->flags;
+    emms_c();
+    if (!rgb15to16)
+        sws_rgb2rgb_init();
+
+    unscaled = (srcW == dstW && srcH == dstH);
+
+    handle_jpeg(&srcFormat);
+    handle_jpeg(&dstFormat);
+    handle_0alpha(&srcFormat);
+    handle_0alpha(&dstFormat);
+
+    if(srcFormat!=c->srcFormat || dstFormat!=c->dstFormat){
+        av_log(c, AV_LOG_WARNING, "deprecated pixel format used, make sure you did set range correctly\n");
+        c->srcFormat= srcFormat;
+        c->dstFormat= dstFormat;
+    }
+
+    if (!sws_isSupportedInput(srcFormat)) {
+        av_log(c, AV_LOG_ERROR, "%s is not supported as input pixel format\n",
+               av_get_pix_fmt_name(srcFormat));
+        return AVERROR(EINVAL);
+    }
+    if (!sws_isSupportedOutput(dstFormat)) {
+        av_log(c, AV_LOG_ERROR, "%s is not supported as output pixel format\n",
+               av_get_pix_fmt_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, got %X\n", i);
+        return AVERROR(EINVAL);
+    }
+    /* sanity check */
+    if (srcW < 1 || srcH < 1 || dstW < 1 || dstH < 1) {
+        /* FIXME check if these are enough and try to lower 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      = (((int64_t)srcW << 16) + (dstW >> 1)) / dstW;
+    c->lumYInc      = (((int64_t)srcH << 16) + (dstH >> 1)) / dstH;
+    c->dstFormatBpp = av_get_bits_per_pixel(desc_dst);
+    c->srcFormatBpp = av_get_bits_per_pixel(desc_src);
+    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);
+
+    if (isAnyRGB(dstFormat) && !(flags&SWS_FULL_CHR_H_INT)) {
+        if (dstW&1) {
+            av_log(c, AV_LOG_DEBUG, "Forcing full internal H chroma due to odd output size\n");
+            flags |= SWS_FULL_CHR_H_INT;
+            c->flags = flags;
+        }
+    }
+
+    if(dstFormat == AV_PIX_FMT_BGR4_BYTE ||
+       dstFormat == AV_PIX_FMT_RGB4_BYTE ||
+       dstFormat == AV_PIX_FMT_BGR8 ||
+       dstFormat == AV_PIX_FMT_RGB8) {
+        if (flags & SWS_ERROR_DIFFUSION && !(flags & SWS_FULL_CHR_H_INT)) {
+            av_log(c, AV_LOG_DEBUG,
+                "Error diffusion dither is only supported in full chroma interpolation for destination format '%s'\n",
+                av_get_pix_fmt_name(dstFormat));
+            flags   |= SWS_FULL_CHR_H_INT;
+            c->flags = flags;
+        }
+        if (!(flags & SWS_ERROR_DIFFUSION) && (flags & SWS_FULL_CHR_H_INT)) {
+            av_log(c, AV_LOG_DEBUG,
+                "Ordered dither is not supported in full chroma interpolation for destination format '%s'\n",
+                av_get_pix_fmt_name(dstFormat));
+            flags   |= SWS_ERROR_DIFFUSION;
+            c->flags = flags;
+        }
+    }
+    if (isPlanarRGB(dstFormat)) {
+        if (!(flags & SWS_FULL_CHR_H_INT)) {
+            av_log(c, AV_LOG_DEBUG,
+                   "%s output is not supported with half chroma resolution, switching to full\n",
+                   av_get_pix_fmt_name(dstFormat));
+            flags   |= SWS_FULL_CHR_H_INT;
+            c->flags = flags;
+        }
+    }
+
+    /* reuse chroma for 2 pixels RGB/BGR unless user wants full
+     * chroma interpolation */
+    if (flags & SWS_FULL_CHR_H_INT &&
+        isAnyRGB(dstFormat)        &&
+        !isPlanarRGB(dstFormat)    &&
+        dstFormat != AV_PIX_FMT_RGBA  &&
+        dstFormat != AV_PIX_FMT_ARGB  &&
+        dstFormat != AV_PIX_FMT_BGRA  &&
+        dstFormat != AV_PIX_FMT_ABGR  &&
+        dstFormat != AV_PIX_FMT_RGB24 &&
+        dstFormat != AV_PIX_FMT_BGR24 &&
+        dstFormat != AV_PIX_FMT_BGR4_BYTE &&
+        dstFormat != AV_PIX_FMT_RGB4_BYTE &&
+        dstFormat != AV_PIX_FMT_BGR8 &&
+        dstFormat != AV_PIX_FMT_RGB8
+    ) {
+        av_log(c, AV_LOG_WARNING,
+               "full chroma interpolation for destination format '%s' not yet implemented\n",
+               av_get_pix_fmt_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 != AV_PIX_FMT_RGB8 && srcFormat != AV_PIX_FMT_BGR8 &&
+        srcFormat != AV_PIX_FMT_RGB4 && srcFormat != AV_PIX_FMT_BGR4 &&
+        srcFormat != AV_PIX_FMT_RGB4_BYTE && srcFormat != AV_PIX_FMT_BGR4_BYTE &&
+        srcFormat != AV_PIX_FMT_GBRP9BE   && srcFormat != AV_PIX_FMT_GBRP9LE  &&
+        srcFormat != AV_PIX_FMT_GBRP10BE  && srcFormat != AV_PIX_FMT_GBRP10LE &&
+        srcFormat != AV_PIX_FMT_GBRP12BE  && srcFormat != AV_PIX_FMT_GBRP12LE &&
+        srcFormat != AV_PIX_FMT_GBRP14BE  && srcFormat != AV_PIX_FMT_GBRP14LE &&
+        srcFormat != AV_PIX_FMT_GBRP16BE  && srcFormat != AV_PIX_FMT_GBRP16LE &&
+        ((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);
+
+    FF_ALLOC_OR_GOTO(c, c->formatConvBuffer, FFALIGN(srcW*2+78, 16) * 2, fail);
+
+    /* 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",
+                       av_get_pix_fmt_name(srcFormat), av_get_pix_fmt_name(dstFormat));
+            return 0;
+        }
+    }
+
+    c->srcBpc = 1 + desc_src->comp[0].depth_minus1;
+    if (c->srcBpc < 8)
+        c->srcBpc = 8;
+    c->dstBpc = 1 + desc_dst->comp[0].depth_minus1;
+    if (c->dstBpc < 8)
+        c->dstBpc = 8;
+    if (isAnyRGB(srcFormat) || srcFormat == AV_PIX_FMT_PAL8)
+        c->srcBpc = 16;
+    if (c->dstBpc == 16)
+        dst_stride <<= 1;
+
+    if (INLINE_MMXEXT(cpu_flags) && c->srcBpc == 8 && c->dstBpc <= 14) {
+        c->canMMXEXTBeUsed = (dstW >= srcW && (dstW & 31) == 0 &&
+                              (srcW & 15) == 0) ? 1 : 0;
+        if (!c->canMMXEXTBeUsed && 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 MMXEXT scaler\n");
+        }
+        if (usesHFilter || isNBPS(c->srcFormat) || is16BPS(c->srcFormat) || isAnyRGB(c->srcFormat))
+            c->canMMXEXTBeUsed = 0;
+    } else
+        c->canMMXEXTBeUsed = 0;
+
+    c->chrXInc = (((int64_t)c->chrSrcW << 16) + (c->chrDstW >> 1)) / c->chrDstW;
+    c->chrYInc = (((int64_t)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->canMMXEXTBeUsed) {
+            c->lumXInc += 20;
+            c->chrXInc += 20;
+        }
+        // we don't use the x86 asm scaler if MMX is available
+        else if (INLINE_MMX(cpu_flags) && c->dstBpc <= 14) {
+            c->lumXInc = ((int64_t)(srcW       - 2) << 16) / (dstW       - 2) - 20;
+            c->chrXInc = ((int64_t)(c->chrSrcW - 2) << 16) / (c->chrDstW - 2) - 20;
+        }
+    }
+
+#define USE_MMAP (HAVE_MMAP && HAVE_MPROTECT && defined MAP_ANONYMOUS)
+
+    /* precalculate horizontal scaler filter coefficients */
+    {
+#if HAVE_MMXEXT_INLINE
+// can't downscale !!!
+        if (c->canMMXEXTBeUsed && (flags & SWS_FAST_BILINEAR)) {
+            c->lumMmxextFilterCodeSize = init_hscaler_mmxext(dstW, c->lumXInc, NULL,
+                                                             NULL, NULL, 8);
+            c->chrMmxextFilterCodeSize = init_hscaler_mmxext(c->chrDstW, c->chrXInc,
+                                                             NULL, NULL, NULL, 4);
+
+#if USE_MMAP
+            c->lumMmxextFilterCode = mmap(NULL, c->lumMmxextFilterCodeSize,
+                                          PROT_READ | PROT_WRITE,
+                                          MAP_PRIVATE | MAP_ANONYMOUS,
+                                          -1, 0);
+            c->chrMmxextFilterCode = mmap(NULL, c->chrMmxextFilterCodeSize,
+                                          PROT_READ | PROT_WRITE,
+                                          MAP_PRIVATE | MAP_ANONYMOUS,
+                                          -1, 0);
+#elif HAVE_VIRTUALALLOC
+            c->lumMmxextFilterCode = VirtualAlloc(NULL,
+                                                  c->lumMmxextFilterCodeSize,
+                                                  MEM_COMMIT,
+                                                  PAGE_EXECUTE_READWRITE);
+            c->chrMmxextFilterCode = VirtualAlloc(NULL,
+                                                  c->chrMmxextFilterCodeSize,
+                                                  MEM_COMMIT,
+                                                  PAGE_EXECUTE_READWRITE);
+#else
+            c->lumMmxextFilterCode = av_malloc(c->lumMmxextFilterCodeSize);
+            c->chrMmxextFilterCode = av_malloc(c->chrMmxextFilterCodeSize);
+#endif
+
+#ifdef MAP_ANONYMOUS
+            if (c->lumMmxextFilterCode == MAP_FAILED || c->chrMmxextFilterCode == MAP_FAILED)
+#else
+            if (!c->lumMmxextFilterCode || !c->chrMmxextFilterCode)
+#endif
+            {
+                av_log(c, AV_LOG_ERROR, "Failed to allocate MMX2FilterCode\n");
+                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);
+
+            init_hscaler_mmxext(      dstW, c->lumXInc, c->lumMmxextFilterCode,
+                                c->hLumFilter, (uint32_t*)c->hLumFilterPos, 8);
+            init_hscaler_mmxext(c->chrDstW, c->chrXInc, c->chrMmxextFilterCode,
+                                c->hChrFilter, (uint32_t*)c->hChrFilterPos, 4);
+
+#if USE_MMAP
+            mprotect(c->lumMmxextFilterCode, c->lumMmxextFilterCodeSize, PROT_EXEC | PROT_READ);
+            mprotect(c->chrMmxextFilterCode, c->chrMmxextFilterCodeSize, PROT_EXEC | PROT_READ);
+#endif
+        } else
+#endif /* HAVE_MMXEXT_INLINE */
+        {
+            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) ? 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      = (int64_t)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];
+    }
+
+    for (i = 0; i < 4; i++)
+        FF_ALLOCZ_OR_GOTO(c, c->dither_error[i], (c->dstW+2) * sizeof(int), fail);
+
+    /* 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 * 3 * sizeof(int16_t *), fail);
+    FF_ALLOC_OR_GOTO(c, c->chrUPixBuf, c->vChrBufSize * 3 * sizeof(int16_t *), fail);
+    FF_ALLOC_OR_GOTO(c, c->chrVPixBuf, c->vChrBufSize * 3 * sizeof(int16_t *), fail);
+    if (CONFIG_SWSCALE_ALPHA && isALPHA(c->srcFormat) && isALPHA(c->dstFormat))
+        FF_ALLOCZ_OR_GOTO(c, c->alpPixBuf, c->vLumBufSize * 3 * sizeof(int16_t *), fail);
+    /* Note we need at least one pixel more at the end because of the MMX code
+     * (just in case someone wants to 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 + 16, fail);
+        c->lumPixBuf[i] = c->lumPixBuf[i + c->vLumBufSize];
+    }
+    // 64 / c->scalingBpp is the same as 16 / sizeof(scaling_intermediate)
+    c->uv_off   = (dst_stride>>1) + 64 / (c->dstBpc &~ 7);
+    c->uv_offx2 = dst_stride + 16;
+    for (i = 0; i < c->vChrBufSize; i++) {
+        FF_ALLOC_OR_GOTO(c, c->chrUPixBuf[i + c->vChrBufSize],
+                         dst_stride * 2 + 32, fail);
+        c->chrUPixBuf[i] = c->chrUPixBuf[i + c->vChrBufSize];
+        c->chrVPixBuf[i] = c->chrVPixBuf[i + c->vChrBufSize]
+                         = c->chrUPixBuf[i] + (dst_stride >> 1) + 8;
+    }
+    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 + 16, 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++)
+        if(desc_dst->comp[0].depth_minus1 == 15){
+            av_assert0(c->dstBpc > 14);
+            for(j=0; j<dst_stride/2+1; j++)
+                ((int32_t*)(c->chrUPixBuf[i]))[j] = 1<<18;
+        } else
+            for(j=0; j<dst_stride+1; j++)
+                ((int16_t*)(c->chrUPixBuf[i]))[j] = 1<<14;
+
+    av_assert0(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 ",
+               av_get_pix_fmt_name(srcFormat),
+#ifdef DITHER1XBPP
+               dstFormat == AV_PIX_FMT_BGR555   || dstFormat == AV_PIX_FMT_BGR565   ||
+               dstFormat == AV_PIX_FMT_RGB444BE || dstFormat == AV_PIX_FMT_RGB444LE ||
+               dstFormat == AV_PIX_FMT_BGR444BE || dstFormat == AV_PIX_FMT_BGR444LE ?
+                                                             "dithered " : "",
+#else
+               "",
+#endif
+               av_get_pix_fmt_name(dstFormat));
+
+        if (INLINE_MMXEXT(cpu_flags))
+            av_log(c, AV_LOG_INFO, "using MMXEXT\n");
+        else if (INLINE_AMD3DNOW(cpu_flags))
+            av_log(c, AV_LOG_INFO, "using 3DNOW\n");
+        else if (INLINE_MMX(cpu_flags))
+            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");
+
+        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;
+}
+
+#if FF_API_SWS_GETCONTEXT
+SwsContext *sws_getContext(int srcW, int srcH, enum AVPixelFormat srcFormat,
+                           int dstW, int dstH, enum AVPixelFormat dstFormat,
+                           int flags, SwsFilter *srcFilter,
+                           SwsFilter *dstFilter, const double *param)
+{
+    SwsContext *c;
+
+    if (!(c = sws_alloc_context()))
+        return NULL;
+
+    c->flags     = flags;
+    c->srcW      = srcW;
+    c->srcH      = srcH;
+    c->dstW      = dstW;
+    c->dstH      = dstH;
+    c->srcRange  = handle_jpeg(&srcFormat);
+    c->dstRange  = handle_jpeg(&dstFormat);
+    c->src0Alpha = handle_0alpha(&srcFormat);
+    c->dst0Alpha = handle_0alpha(&dstFormat);
+    c->srcFormat = srcFormat;
+    c->dstFormat = dstFormat;
+
+    if (param) {
+        c->param[0] = param[0];
+        c->param[1] = param[1];
+    }
+    sws_setColorspaceDetails(c, ff_yuv2rgb_coeffs[SWS_CS_DEFAULT], c->srcRange,
+                             ff_yuv2rgb_coeffs[SWS_CS_DEFAULT] /* FIXME*/,
+                             c->dstRange, 0, 1 << 16, 1 << 16);
+
+    if (sws_init_context(c, srcFilter, dstFilter) < 0) {
+        sws_freeContext(c);
+        return NULL;
+    }
+
+    return c;
+}
+#endif
+
+SwsFilter *sws_getDefaultFilter(float lumaGBlur, float chromaGBlur,
+                                float lumaSharpen, float chromaSharpen,
+                                float chromaHShift, float chromaVShift,
+                                int verbose)
+{
+    SwsFilter *filter = av_malloc(sizeof(SwsFilter));
+    if (!filter)
+        return NULL;
+
+    if (lumaGBlur != 0.0) {
+        filter->lumH = sws_getGaussianVec(lumaGBlur, 3.0);
+        filter->lumV = sws_getGaussianVec(lumaGBlur, 3.0);
+    } else {
+        filter->lumH = sws_getIdentityVec();
+        filter->lumV = sws_getIdentityVec();
+    }
+
+    if (chromaGBlur != 0.0) {
+        filter->chrH = sws_getGaussianVec(chromaGBlur, 3.0);
+        filter->chrV = sws_getGaussianVec(chromaGBlur, 3.0);
+    } else {
+        filter->chrH = sws_getIdentityVec();
+        filter->chrV = sws_getIdentityVec();
+    }
+
+    if (chromaSharpen != 0.0) {
+        SwsVector *id = sws_getIdentityVec();
+        sws_scaleVec(filter->chrH, -chromaSharpen);
+        sws_scaleVec(filter->chrV, -chromaSharpen);
+        sws_addVec(filter->chrH, id);
+        sws_addVec(filter->chrV, id);
+        sws_freeVec(id);
+    }
+
+    if (lumaSharpen != 0.0) {
+        SwsVector *id = sws_getIdentityVec();
+        sws_scaleVec(filter->lumH, -lumaSharpen);
+        sws_scaleVec(filter->lumV, -lumaSharpen);
+        sws_addVec(filter->lumH, id);
+        sws_addVec(filter->lumV, id);
+        sws_freeVec(id);
+    }
+
+    if (chromaHShift != 0.0)
+        sws_shiftVec(filter->chrH, (int)(chromaHShift + 0.5));
+
+    if (chromaVShift != 0.0)
+        sws_shiftVec(filter->chrV, (int)(chromaVShift + 0.5));
+
+    sws_normalizeVec(filter->chrH, 1.0);
+    sws_normalizeVec(filter->chrV, 1.0);
+    sws_normalizeVec(filter->lumH, 1.0);
+    sws_normalizeVec(filter->lumV, 1.0);
+
+    if (verbose)
+        sws_printVec2(filter->chrH, NULL, AV_LOG_DEBUG);
+    if (verbose)
+        sws_printVec2(filter->lumH, NULL, AV_LOG_DEBUG);
+
+    return filter;
+}
+
+SwsVector *sws_allocVec(int length)
+{
+    SwsVector *vec;
+
+    if(length <= 0 || length > INT_MAX/ sizeof(double))
+        return NULL;
+
+    vec = av_malloc(sizeof(SwsVector));
+    if (!vec)
+        return NULL;
+    vec->length = length;
+    vec->coeff  = av_malloc(sizeof(double) * length);
+    if (!vec->coeff)
+        av_freep(&vec);
+    return vec;
+}
+
+SwsVector *sws_getGaussianVec(double variance, double quality)
+{
+    const int length = (int)(variance * quality + 0.5) | 1;
+    int i;
+    double middle  = (length - 1) * 0.5;
+    SwsVector *vec;
+
+    if(variance < 0 || quality < 0)
+        return NULL;
+
+    vec = sws_allocVec(length);
+
+    if (!vec)
+        return NULL;
+
+    for (i = 0; i < length; i++) {
+        double dist = i - middle;
+        vec->coeff[i] = exp(-dist * dist / (2 * variance * variance)) /
+                        sqrt(2 * variance * M_PI);
+    }
+
+    sws_normalizeVec(vec, 1.0);
+
+    return vec;
+}
+
+SwsVector *sws_getConstVec(double c, int length)
+{
+    int i;
+    SwsVector *vec = sws_allocVec(length);
+
+    if (!vec)
+        return NULL;
+
+    for (i = 0; i < length; i++)
+        vec->coeff[i] = c;
+
+    return vec;
+}
+
+SwsVector *sws_getIdentityVec(void)
+{
+    return sws_getConstVec(1.0, 1);
+}
+
+static double sws_dcVec(SwsVector *a)
+{
+    int i;
+    double sum = 0;
+
+    for (i = 0; i < a->length; i++)
+        sum += a->coeff[i];
+
+    return sum;
+}
+
+void sws_scaleVec(SwsVector *a, double scalar)
+{
+    int i;
+
+    for (i = 0; i < a->length; i++)
+        a->coeff[i] *= scalar;
+}
+
+void sws_normalizeVec(SwsVector *a, double height)
+{
+    sws_scaleVec(a, height / sws_dcVec(a));
+}
+
+static SwsVector *sws_getConvVec(SwsVector *a, SwsVector *b)
+{
+    int length = a->length + b->length - 1;
+    int i, j;
+    SwsVector *vec = sws_getConstVec(0.0, length);
+
+    if (!vec)
+        return NULL;
+
+    for (i = 0; i < a->length; i++) {
+        for (j = 0; j < b->length; j++) {
+            vec->coeff[i + j] += a->coeff[i] * b->coeff[j];
+        }
+    }
+
+    return vec;
+}
+
+static SwsVector *sws_sumVec(SwsVector *a, SwsVector *b)
+{
+    int length = FFMAX(a->length, b->length);
+    int i;
+    SwsVector *vec = sws_getConstVec(0.0, length);
+
+    if (!vec)
+        return NULL;
+
+    for (i = 0; i < a->length; i++)
+        vec->coeff[i + (length - 1) / 2 - (a->length - 1) / 2] += a->coeff[i];
+    for (i = 0; i < b->length; i++)
+        vec->coeff[i + (length - 1) / 2 - (b->length - 1) / 2] += b->coeff[i];
+
+    return vec;
+}
+
+static SwsVector *sws_diffVec(SwsVector *a, SwsVector *b)
+{
+    int length = FFMAX(a->length, b->length);
+    int i;
+    SwsVector *vec = sws_getConstVec(0.0, length);
+
+    if (!vec)
+        return NULL;
+
+    for (i = 0; i < a->length; i++)
+        vec->coeff[i + (length - 1) / 2 - (a->length - 1) / 2] += a->coeff[i];
+    for (i = 0; i < b->length; i++)
+        vec->coeff[i + (length - 1) / 2 - (b->length - 1) / 2] -= b->coeff[i];
+
+    return vec;
+}
+
+/* shift left / or right if "shift" is negative */
+static SwsVector *sws_getShiftedVec(SwsVector *a, int shift)
+{
+    int length = a->length + FFABS(shift) * 2;
+    int i;
+    SwsVector *vec = sws_getConstVec(0.0, length);
+
+    if (!vec)
+        return NULL;
+
+    for (i = 0; i < a->length; i++) {
+        vec->coeff[i + (length    - 1) / 2 -
+                       (a->length - 1) / 2 - shift] = a->coeff[i];
+    }
+
+    return vec;
+}
+
+void sws_shiftVec(SwsVector *a, int shift)
+{
+    SwsVector *shifted = sws_getShiftedVec(a, shift);
+    av_free(a->coeff);
+    a->coeff  = shifted->coeff;
+    a->length = shifted->length;
+    av_free(shifted);
+}
+
+void sws_addVec(SwsVector *a, SwsVector *b)
+{
+    SwsVector *sum = sws_sumVec(a, b);
+    av_free(a->coeff);
+    a->coeff  = sum->coeff;
+    a->length = sum->length;
+    av_free(sum);
+}
+
+void sws_subVec(SwsVector *a, SwsVector *b)
+{
+    SwsVector *diff = sws_diffVec(a, b);
+    av_free(a->coeff);
+    a->coeff  = diff->coeff;
+    a->length = diff->length;
+    av_free(diff);
+}
+
+void sws_convVec(SwsVector *a, SwsVector *b)
+{
+    SwsVector *conv = sws_getConvVec(a, b);
+    av_free(a->coeff);
+    a->coeff  = conv->coeff;
+    a->length = conv->length;
+    av_free(conv);
+}
+
+SwsVector *sws_cloneVec(SwsVector *a)
+{
+    int i;
+    SwsVector *vec = sws_allocVec(a->length);
+
+    if (!vec)
+        return NULL;
+
+    for (i = 0; i < a->length; i++)
+        vec->coeff[i] = a->coeff[i];
+
+    return vec;
+}
+
+void sws_printVec2(SwsVector *a, AVClass *log_ctx, int log_level)
+{
+    int i;
+    double max = 0;
+    double min = 0;
+    double range;
+
+    for (i = 0; i < a->length; i++)
+        if (a->coeff[i] > max)
+            max = a->coeff[i];
+
+    for (i = 0; i < a->length; i++)
+        if (a->coeff[i] < min)
+            min = a->coeff[i];
+
+    range = max - min;
+
+    for (i = 0; i < a->length; i++) {
+        int x = (int)((a->coeff[i] - min) * 60.0 / range + 0.5);
+        av_log(log_ctx, log_level, "%1.3f ", a->coeff[i]);
+        for (; x > 0; x--)
+            av_log(log_ctx, log_level, " ");
+        av_log(log_ctx, log_level, "|\n");
+    }
+}
+
+void sws_freeVec(SwsVector *a)
+{
+    if (!a)
+        return;
+    av_freep(&a->coeff);
+    a->length = 0;
+    av_free(a);
+}
+
+void sws_freeFilter(SwsFilter *filter)
+{
+    if (!filter)
+        return;
+
+    if (filter->lumH)
+        sws_freeVec(filter->lumH);
+    if (filter->lumV)
+        sws_freeVec(filter->lumV);
+    if (filter->chrH)
+        sws_freeVec(filter->chrH);
+    if (filter->chrV)
+        sws_freeVec(filter->chrV);
+    av_free(filter);
+}
+
+void sws_freeContext(SwsContext *c)
+{
+    int i;
+    if (!c)
+        return;
+
+    if (c->lumPixBuf) {
+        for (i = 0; i < c->vLumBufSize; i++)
+            av_freep(&c->lumPixBuf[i]);
+        av_freep(&c->lumPixBuf);
+    }
+
+    if (c->chrUPixBuf) {
+        for (i = 0; i < c->vChrBufSize; i++)
+            av_freep(&c->chrUPixBuf[i]);
+        av_freep(&c->chrUPixBuf);
+        av_freep(&c->chrVPixBuf);
+    }
+
+    if (CONFIG_SWSCALE_ALPHA && c->alpPixBuf) {
+        for (i = 0; i < c->vLumBufSize; i++)
+            av_freep(&c->alpPixBuf[i]);
+        av_freep(&c->alpPixBuf);
+    }
+
+    for (i = 0; i < 4; i++)
+        av_freep(&c->dither_error[i]);
+
+    av_freep(&c->vLumFilter);
+    av_freep(&c->vChrFilter);
+    av_freep(&c->hLumFilter);
+    av_freep(&c->hChrFilter);
+#if HAVE_ALTIVEC
+    av_freep(&c->vYCoeffsBank);
+    av_freep(&c->vCCoeffsBank);
+#endif
+
+    av_freep(&c->vLumFilterPos);
+    av_freep(&c->vChrFilterPos);
+    av_freep(&c->hLumFilterPos);
+    av_freep(&c->hChrFilterPos);
+
+#if HAVE_MMX_INLINE
+#if USE_MMAP
+    if (c->lumMmxextFilterCode)
+        munmap(c->lumMmxextFilterCode, c->lumMmxextFilterCodeSize);
+    if (c->chrMmxextFilterCode)
+        munmap(c->chrMmxextFilterCode, c->chrMmxextFilterCodeSize);
+#elif HAVE_VIRTUALALLOC
+    if (c->lumMmxextFilterCode)
+        VirtualFree(c->lumMmxextFilterCode, 0, MEM_RELEASE);
+    if (c->chrMmxextFilterCode)
+        VirtualFree(c->chrMmxextFilterCode, 0, MEM_RELEASE);
+#else
+    av_free(c->lumMmxextFilterCode);
+    av_free(c->chrMmxextFilterCode);
+#endif
+    c->lumMmxextFilterCode = NULL;
+    c->chrMmxextFilterCode = NULL;
+#endif /* HAVE_MMX_INLINE */
+
+    av_freep(&c->yuvTable);
+    av_freep(&c->formatConvBuffer);
+
+    av_free(c);
+}
+
+struct SwsContext *sws_getCachedContext(struct SwsContext *context, int srcW,
+                                        int srcH, enum AVPixelFormat srcFormat,
+                                        int dstW, int dstH,
+                                        enum AVPixelFormat dstFormat, int flags,
+                                        SwsFilter *srcFilter,
+                                        SwsFilter *dstFilter,
+                                        const double *param)
+{
+    static const double default_param[2] = { SWS_PARAM_DEFAULT,
+                                             SWS_PARAM_DEFAULT };
+
+    if (!param)
+        param = default_param;
+
+    if (context &&
+        (context->srcW      != srcW      ||
+         context->srcH      != srcH      ||
+         context->srcFormat != srcFormat ||
+         context->dstW      != dstW      ||
+         context->dstH      != dstH      ||
+         context->dstFormat != dstFormat ||
+         context->flags     != flags     ||
+         context->param[0]  != param[0]  ||
+         context->param[1]  != param[1])) {
+        sws_freeContext(context);
+        context = NULL;
+    }
+
+    if (!context) {
+        if (!(context = sws_alloc_context()))
+            return NULL;
+        context->srcW      = srcW;
+        context->srcH      = srcH;
+        context->srcRange  = handle_jpeg(&srcFormat);
+        context->src0Alpha = handle_0alpha(&srcFormat);
+        context->srcFormat = srcFormat;
+        context->dstW      = dstW;
+        context->dstH      = dstH;
+        context->dstRange  = handle_jpeg(&dstFormat);
+        context->dst0Alpha = handle_0alpha(&dstFormat);
+        context->dstFormat = dstFormat;
+        context->flags     = flags;
+        context->param[0]  = param[0];
+        context->param[1]  = param[1];
+        sws_setColorspaceDetails(context, ff_yuv2rgb_coeffs[SWS_CS_DEFAULT],
+                                 context->srcRange,
+                                 ff_yuv2rgb_coeffs[SWS_CS_DEFAULT] /* FIXME*/,
+                                 context->dstRange, 0, 1 << 16, 1 << 16);
+        if (sws_init_context(context, srcFilter, dstFilter) < 0) {
+            sws_freeContext(context);
+            return NULL;
+        }
+    }
+    return context;
+}