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FFmpeg/libswscale/utils.c

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/*
* 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 _DEFAULT_SOURCE
#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/imgutils.h"
#include "libavutil/intreadwrite.h"
#include "libavutil/libm.h"
#include "libavutil/mathematics.h"
#include "libavutil/opt.h"
#include "libavutil/pixdesc.h"
#include "libavutil/aarch64/cpu.h"
#include "libavutil/ppc/cpu.h"
#include "libavutil/x86/asm.h"
#include "libavutil/x86/cpu.h"
// We have to implement deprecated functions until they are removed, this is the
// simplest way to prevent warnings
#undef attribute_deprecated
#define attribute_deprecated
#include "rgb2rgb.h"
#include "swscale.h"
#include "swscale_internal.h"
#if !FF_API_SWS_VECTOR
static SwsVector *sws_getIdentityVec(void);
static void sws_addVec(SwsVector *a, SwsVector *b);
static void sws_shiftVec(SwsVector *a, int shift);
static void sws_printVec2(SwsVector *a, AVClass *log_ctx, int log_level);
#endif
static void handle_formats(SwsContext *c);
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;
}
typedef struct FormatEntry {
uint8_t is_supported_in :1;
uint8_t is_supported_out :1;
uint8_t is_supported_endianness :1;
} 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_YUVJ411P] = { 1, 1 },
[AV_PIX_FMT_YUVJ422P] = { 1, 1 },
[AV_PIX_FMT_YUVJ444P] = { 1, 1 },
[AV_PIX_FMT_YVYU422] = { 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_GRAY10BE] = { 1, 1 },
[AV_PIX_FMT_GRAY10LE] = { 1, 1 },
[AV_PIX_FMT_GRAY12BE] = { 1, 1 },
[AV_PIX_FMT_GRAY12LE] = { 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_YUV440P10LE] = { 1, 1 },
[AV_PIX_FMT_YUV440P10BE] = { 1, 1 },
[AV_PIX_FMT_YUV440P12LE] = { 1, 1 },
[AV_PIX_FMT_YUV440P12BE] = { 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, 1, 1 },
[AV_PIX_FMT_RGBA64LE] = { 1, 1, 1 },
[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_YA8] = { 1, 1 },
[AV_PIX_FMT_YA16BE] = { 1, 0 },
[AV_PIX_FMT_YA16LE] = { 1, 0 },
[AV_PIX_FMT_BGR48BE] = { 1, 1 },
[AV_PIX_FMT_BGR48LE] = { 1, 1 },
[AV_PIX_FMT_BGRA64BE] = { 1, 1, 1 },
[AV_PIX_FMT_BGRA64LE] = { 1, 1, 1 },
[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_GBRAP10LE] = { 1, 1 },
[AV_PIX_FMT_GBRAP10BE] = { 1, 1 },
[AV_PIX_FMT_GBRP12LE] = { 1, 1 },
[AV_PIX_FMT_GBRP12BE] = { 1, 1 },
[AV_PIX_FMT_GBRAP12LE] = { 1, 1 },
[AV_PIX_FMT_GBRAP12BE] = { 1, 1 },
[AV_PIX_FMT_GBRP14LE] = { 1, 1 },
[AV_PIX_FMT_GBRP14BE] = { 1, 1 },
[AV_PIX_FMT_GBRP16LE] = { 1, 1 },
[AV_PIX_FMT_GBRP16BE] = { 1, 1 },
[AV_PIX_FMT_GBRAP] = { 1, 1 },
[AV_PIX_FMT_GBRAP16LE] = { 1, 1 },
[AV_PIX_FMT_GBRAP16BE] = { 1, 1 },
[AV_PIX_FMT_BAYER_BGGR8] = { 1, 0 },
[AV_PIX_FMT_BAYER_RGGB8] = { 1, 0 },
[AV_PIX_FMT_BAYER_GBRG8] = { 1, 0 },
[AV_PIX_FMT_BAYER_GRBG8] = { 1, 0 },
[AV_PIX_FMT_BAYER_BGGR16LE] = { 1, 0 },
[AV_PIX_FMT_BAYER_BGGR16BE] = { 1, 0 },
[AV_PIX_FMT_BAYER_RGGB16LE] = { 1, 0 },
[AV_PIX_FMT_BAYER_RGGB16BE] = { 1, 0 },
[AV_PIX_FMT_BAYER_GBRG16LE] = { 1, 0 },
[AV_PIX_FMT_BAYER_GBRG16BE] = { 1, 0 },
[AV_PIX_FMT_BAYER_GRBG16LE] = { 1, 0 },
[AV_PIX_FMT_BAYER_GRBG16BE] = { 1, 0 },
[AV_PIX_FMT_XYZ12BE] = { 1, 1, 1 },
[AV_PIX_FMT_XYZ12LE] = { 1, 1, 1 },
[AV_PIX_FMT_AYUV64LE] = { 1, 1},
[AV_PIX_FMT_P010LE] = { 1, 1 },
[AV_PIX_FMT_P010BE] = { 1, 1 },
[AV_PIX_FMT_P016LE] = { 1, 0 },
[AV_PIX_FMT_P016BE] = { 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;
}
int sws_isSupportedEndiannessConversion(enum AVPixelFormat pix_fmt)
{
return (unsigned)pix_fmt < AV_PIX_FMT_NB ?
format_entries[pix_fmt].is_supported_endianness : 0;
}
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 av_cold int get_local_pos(SwsContext *s, int chr_subsample, int pos, int dir)
{
if (pos == -1 || pos <= -513) {
pos = (128 << chr_subsample) - 128;
}
pos += 128; // relative to ideal left edge
return pos >> chr_subsample;
}
typedef struct {
int flag; ///< flag associated to the algorithm
const char *description; ///< human-readable description
int size_factor; ///< size factor used when initing the filters
} ScaleAlgorithm;
static const ScaleAlgorithm scale_algorithms[] = {
{ SWS_AREA, "area averaging", 1 /* downscale only, for upscale it is bilinear */ },
{ SWS_BICUBIC, "bicubic", 4 },
{ SWS_BICUBLIN, "luma bicubic / chroma bilinear", -1 },
{ SWS_BILINEAR, "bilinear", 2 },
{ SWS_FAST_BILINEAR, "fast bilinear", -1 },
{ SWS_GAUSS, "Gaussian", 8 /* infinite ;) */ },
{ SWS_LANCZOS, "Lanczos", -1 /* custom */ },
{ SWS_POINT, "nearest neighbor / point", -1 },
{ SWS_SINC, "sinc", 20 /* infinite ;) */ },
{ SWS_SPLINE, "bicubic spline", 20 /* infinite :)*/ },
{ SWS_X, "experimental", 8 },
};
static av_cold 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 srcPos, int dstPos)
{
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_ARRAY_OR_GOTO(NULL, *filterPos, (dstW + 3), sizeof(**filterPos), fail);
if (FFABS(xInc - 0x10000) < 10 && srcPos == dstPos) { // unscaled
int i;
filterSize = 1;
FF_ALLOCZ_ARRAY_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_ARRAY_OR_GOTO(NULL, filter,
dstW, sizeof(*filter) * filterSize, fail);
xDstInSrc = ((dstPos*(int64_t)xInc)>>8) - ((srcPos*0x8000LL)>>7);
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_ARRAY_OR_GOTO(NULL, filter,
dstW, sizeof(*filter) * filterSize, fail);
xDstInSrc = ((dstPos*(int64_t)xInc)>>8) - ((srcPos*0x8000LL)>>7);
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 = -1;
for (i = 0; i < FF_ARRAY_ELEMS(scale_algorithms); i++) {
if (flags & scale_algorithms[i].flag && scale_algorithms[i].size_factor > 0) {
sizeFactor = scale_algorithms[i].size_factor;
break;
}
}
if (flags & SWS_LANCZOS)
sizeFactor = param[0] != SWS_PARAM_DEFAULT ? ceil(2 * param[0]) : 6;
av_assert0(sizeFactor > 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_ARRAY_OR_GOTO(NULL, filter,
dstW, sizeof(*filter) * filterSize, fail);
xDstInSrc = ((dstPos*(int64_t)xInc)>>7) - ((srcPos*0x10000LL)>>7);
for (i = 0; i < dstW; i++) {
int xx = (xDstInSrc - (filterSize - 2) * (1LL<<16)) / (1 << 17);
int j;
(*filterPos)[i] = xx;
for (j = 0; j < filterSize; j++) {
int64_t d = (FFABS(((int64_t)xx * (1 << 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;
} 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 = exp2(-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_ARRAY_OR_GOTO(NULL, filter2, dstW, filter2Size * 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 (PPC_ALTIVEC(cpu_flags)) {
// 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 (HAVE_MMX && cpu_flags & AV_CPU_FLAG_MMX) {
// 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_array(dstW, filterSize * sizeof(*filter));
if (!filter)
goto fail;
if (filterSize >= MAX_FILTER_SIZE * 16 /
((flags & SWS_ACCURATE_RND) ? APCK_SIZE : 16)) {
ret = RETCODE_USE_CASCADE;
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] + FFMIN(filterSize - srcW, 0);
int64_t acc = 0;
for (j = filterSize - 1; j >= 0; j--) {
if ((*filterPos)[i] + j >= srcW) {
acc += filter[i * filterSize + j];
filter[i * filterSize + j] = 0;
}
}
for (j = filterSize - 1; j >= 0; j--) {
if (j < shift) {
filter[i * filterSize + j] = 0;
} else {
filter[i * filterSize + j] = filter[i * filterSize + j - shift];
}
}
(*filterPos)[i]-= shift;
filter[i * filterSize + srcW - 1 - (*filterPos)[i]] += acc;
}
av_assert0((*filterPos)[i] >= 0);
av_assert0((*filterPos)[i] < srcW);
if ((*filterPos)[i] + filterSize > srcW) {
for (j = 0; j < filterSize; j++) {
av_assert0((*filterPos)[i] + j < srcW || !filter[i * filterSize + j]);
}
}
}
// 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_ARRAY_OR_GOTO(NULL, *outFilter,
(dstW + 3), *outFilterSize * 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;
if (!sum) {
av_log(NULL, AV_LOG_WARNING, "SwScaler: zero vector in scaling\n");
sum = 1;
}
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, ret == RETCODE_USE_CASCADE ? AV_LOG_DEBUG : AV_LOG_ERROR, "sws: initFilter failed\n");
av_free(filter);
av_free(filter2);
return ret;
}
static void fill_rgb2yuv_table(SwsContext *c, const int table[4], int dstRange)
{
int64_t W, V, Z, Cy, Cu, Cv;
int64_t vr = table[0];
int64_t ub = table[1];
int64_t ug = -table[2];
int64_t vg = -table[3];
int64_t ONE = 65536;
int64_t cy = ONE;
uint8_t *p = (uint8_t*)c->input_rgb2yuv_table;
int i;
static const int8_t map[] = {
BY_IDX, GY_IDX, -1 , BY_IDX, BY_IDX, GY_IDX, -1 , BY_IDX,
RY_IDX, -1 , GY_IDX, RY_IDX, RY_IDX, -1 , GY_IDX, RY_IDX,
RY_IDX, GY_IDX, -1 , RY_IDX, RY_IDX, GY_IDX, -1 , RY_IDX,
BY_IDX, -1 , GY_IDX, BY_IDX, BY_IDX, -1 , GY_IDX, BY_IDX,
BU_IDX, GU_IDX, -1 , BU_IDX, BU_IDX, GU_IDX, -1 , BU_IDX,
RU_IDX, -1 , GU_IDX, RU_IDX, RU_IDX, -1 , GU_IDX, RU_IDX,
RU_IDX, GU_IDX, -1 , RU_IDX, RU_IDX, GU_IDX, -1 , RU_IDX,
BU_IDX, -1 , GU_IDX, BU_IDX, BU_IDX, -1 , GU_IDX, BU_IDX,
BV_IDX, GV_IDX, -1 , BV_IDX, BV_IDX, GV_IDX, -1 , BV_IDX,
RV_IDX, -1 , GV_IDX, RV_IDX, RV_IDX, -1 , GV_IDX, RV_IDX,
RV_IDX, GV_IDX, -1 , RV_IDX, RV_IDX, GV_IDX, -1 , RV_IDX,
BV_IDX, -1 , GV_IDX, BV_IDX, BV_IDX, -1 , GV_IDX, BV_IDX,
RY_IDX, BY_IDX, RY_IDX, BY_IDX, RY_IDX, BY_IDX, RY_IDX, BY_IDX,
BY_IDX, RY_IDX, BY_IDX, RY_IDX, BY_IDX, RY_IDX, BY_IDX, RY_IDX,
GY_IDX, -1 , GY_IDX, -1 , GY_IDX, -1 , GY_IDX, -1 ,
-1 , GY_IDX, -1 , GY_IDX, -1 , GY_IDX, -1 , GY_IDX,
RU_IDX, BU_IDX, RU_IDX, BU_IDX, RU_IDX, BU_IDX, RU_IDX, BU_IDX,
BU_IDX, RU_IDX, BU_IDX, RU_IDX, BU_IDX, RU_IDX, BU_IDX, RU_IDX,
GU_IDX, -1 , GU_IDX, -1 , GU_IDX, -1 , GU_IDX, -1 ,
-1 , GU_IDX, -1 , GU_IDX, -1 , GU_IDX, -1 , GU_IDX,
RV_IDX, BV_IDX, RV_IDX, BV_IDX, RV_IDX, BV_IDX, RV_IDX, BV_IDX,
BV_IDX, RV_IDX, BV_IDX, RV_IDX, BV_IDX, RV_IDX, BV_IDX, RV_IDX,
GV_IDX, -1 , GV_IDX, -1 , GV_IDX, -1 , GV_IDX, -1 ,
-1 , GV_IDX, -1 , GV_IDX, -1 , GV_IDX, -1 , GV_IDX, //23
-1 , -1 , -1 , -1 , -1 , -1 , -1 , -1 , //24
-1 , -1 , -1 , -1 , -1 , -1 , -1 , -1 , //25
-1 , -1 , -1 , -1 , -1 , -1 , -1 , -1 , //26
-1 , -1 , -1 , -1 , -1 , -1 , -1 , -1 , //27
-1 , -1 , -1 , -1 , -1 , -1 , -1 , -1 , //28
-1 , -1 , -1 , -1 , -1 , -1 , -1 , -1 , //29
-1 , -1 , -1 , -1 , -1 , -1 , -1 , -1 , //30
-1 , -1 , -1 , -1 , -1 , -1 , -1 , -1 , //31
BY_IDX, GY_IDX, RY_IDX, -1 , -1 , -1 , -1 , -1 , //32
BU_IDX, GU_IDX, RU_IDX, -1 , -1 , -1 , -1 , -1 , //33
BV_IDX, GV_IDX, RV_IDX, -1 , -1 , -1 , -1 , -1 , //34
};
dstRange = 0; //FIXME range = 1 is handled elsewhere
if (!dstRange) {
cy = cy * 255 / 219;
} else {
vr = vr * 224 / 255;
ub = ub * 224 / 255;
ug = ug * 224 / 255;
vg = vg * 224 / 255;
}
W = ROUNDED_DIV(ONE*ONE*ug, ub);
V = ROUNDED_DIV(ONE*ONE*vg, vr);
Z = ONE*ONE-W-V;
Cy = ROUNDED_DIV(cy*Z, ONE);
Cu = ROUNDED_DIV(ub*Z, ONE);
Cv = ROUNDED_DIV(vr*Z, ONE);
c->input_rgb2yuv_table[RY_IDX] = -ROUNDED_DIV((1 << RGB2YUV_SHIFT)*V , Cy);
c->input_rgb2yuv_table[GY_IDX] = ROUNDED_DIV((1 << RGB2YUV_SHIFT)*ONE*ONE , Cy);
c->input_rgb2yuv_table[BY_IDX] = -ROUNDED_DIV((1 << RGB2YUV_SHIFT)*W , Cy);
c->input_rgb2yuv_table[RU_IDX] = ROUNDED_DIV((1 << RGB2YUV_SHIFT)*V , Cu);
c->input_rgb2yuv_table[GU_IDX] = -ROUNDED_DIV((1 << RGB2YUV_SHIFT)*ONE*ONE , Cu);
c->input_rgb2yuv_table[BU_IDX] = ROUNDED_DIV((1 << RGB2YUV_SHIFT)*(Z+W) , Cu);
c->input_rgb2yuv_table[RV_IDX] = ROUNDED_DIV((1 << RGB2YUV_SHIFT)*(V+Z) , Cv);
c->input_rgb2yuv_table[GV_IDX] = -ROUNDED_DIV((1 << RGB2YUV_SHIFT)*ONE*ONE , Cv);
c->input_rgb2yuv_table[BV_IDX] = ROUNDED_DIV((1 << RGB2YUV_SHIFT)*W , Cv);
if(/*!dstRange && */!memcmp(table, ff_yuv2rgb_coeffs[SWS_CS_DEFAULT], sizeof(ff_yuv2rgb_coeffs[SWS_CS_DEFAULT]))) {
c->input_rgb2yuv_table[BY_IDX] = ((int)(0.114 * 219 / 255 * (1 << RGB2YUV_SHIFT) + 0.5));
c->input_rgb2yuv_table[BV_IDX] = (-(int)(0.081 * 224 / 255 * (1 << RGB2YUV_SHIFT) + 0.5));
c->input_rgb2yuv_table[BU_IDX] = ((int)(0.500 * 224 / 255 * (1 << RGB2YUV_SHIFT) + 0.5));
c->input_rgb2yuv_table[GY_IDX] = ((int)(0.587 * 219 / 255 * (1 << RGB2YUV_SHIFT) + 0.5));
c->input_rgb2yuv_table[GV_IDX] = (-(int)(0.419 * 224 / 255 * (1 << RGB2YUV_SHIFT) + 0.5));
c->input_rgb2yuv_table[GU_IDX] = (-(int)(0.331 * 224 / 255 * (1 << RGB2YUV_SHIFT) + 0.5));
c->input_rgb2yuv_table[RY_IDX] = ((int)(0.299 * 219 / 255 * (1 << RGB2YUV_SHIFT) + 0.5));
c->input_rgb2yuv_table[RV_IDX] = ((int)(0.500 * 224 / 255 * (1 << RGB2YUV_SHIFT) + 0.5));
c->input_rgb2yuv_table[RU_IDX] = (-(int)(0.169 * 224 / 255 * (1 << RGB2YUV_SHIFT) + 0.5));
}
for(i=0; i<FF_ARRAY_ELEMS(map); i++)
AV_WL16(p + 16*4 + 2*i, map[i] >= 0 ? c->input_rgb2yuv_table[map[i]] : 0);
}
static void fill_xyztables(struct SwsContext *c)
{
int i;
double xyzgamma = XYZ_GAMMA;
double rgbgamma = 1.0 / RGB_GAMMA;
double xyzgammainv = 1.0 / XYZ_GAMMA;
double rgbgammainv = RGB_GAMMA;
static const int16_t xyz2rgb_matrix[3][4] = {
{13270, -6295, -2041},
{-3969, 7682, 170},
{ 228, -835, 4329} };
static const int16_t rgb2xyz_matrix[3][4] = {
{1689, 1464, 739},
{ 871, 2929, 296},
{ 79, 488, 3891} };
static int16_t xyzgamma_tab[4096], rgbgamma_tab[4096], xyzgammainv_tab[4096], rgbgammainv_tab[4096];
memcpy(c->xyz2rgb_matrix, xyz2rgb_matrix, sizeof(c->xyz2rgb_matrix));
memcpy(c->rgb2xyz_matrix, rgb2xyz_matrix, sizeof(c->rgb2xyz_matrix));
c->xyzgamma = xyzgamma_tab;
c->rgbgamma = rgbgamma_tab;
c->xyzgammainv = xyzgammainv_tab;
c->rgbgammainv = rgbgammainv_tab;
if (rgbgamma_tab[4095])
return;
/* set gamma vectors */
for (i = 0; i < 4096; i++) {
xyzgamma_tab[i] = lrint(pow(i / 4095.0, xyzgamma) * 4095.0);
rgbgamma_tab[i] = lrint(pow(i / 4095.0, rgbgamma) * 4095.0);
xyzgammainv_tab[i] = lrint(pow(i / 4095.0, xyzgammainv) * 4095.0);
rgbgammainv_tab[i] = lrint(pow(i / 4095.0, rgbgammainv) * 4095.0);
}
}
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;
const AVPixFmtDescriptor *desc_src;
int need_reinit = 0;
handle_formats(c);
desc_dst = av_pix_fmt_desc_get(c->dstFormat);
desc_src = av_pix_fmt_desc_get(c->srcFormat);
if(!isYUV(c->dstFormat) && !isGray(c->dstFormat))
dstRange = 0;
if(!isYUV(c->srcFormat) && !isGray(c->srcFormat))
srcRange = 0;
if (c->srcRange != srcRange ||
c->dstRange != dstRange ||
c->brightness != brightness ||
c->contrast != contrast ||
c->saturation != saturation ||
memcmp(c->srcColorspaceTable, inv_table, sizeof(int) * 4) ||
memcmp(c->dstColorspaceTable, table, sizeof(int) * 4)
)
need_reinit = 1;
memmove(c->srcColorspaceTable, inv_table, sizeof(int) * 4);
memmove(c->dstColorspaceTable, table, sizeof(int) * 4);
c->brightness = brightness;
c->contrast = contrast;
c->saturation = saturation;
c->srcRange = srcRange;
c->dstRange = dstRange;
//The srcBpc check is possibly wrong but we seem to lack a definitive reference to test this
//and what we have in ticket 2939 looks better with this check
if (need_reinit && (c->srcBpc == 8 || !isYUV(c->srcFormat)))
ff_sws_init_range_convert(c);
c->dstFormatBpp = av_get_bits_per_pixel(desc_dst);
c->srcFormatBpp = av_get_bits_per_pixel(desc_src);
if (c->cascaded_context[c->cascaded_mainindex])
return sws_setColorspaceDetails(c->cascaded_context[c->cascaded_mainindex],inv_table, srcRange,table, dstRange, brightness, contrast, saturation);
if (!need_reinit)
return 0;
if ((isYUV(c->dstFormat) || isGray(c->dstFormat)) && (isYUV(c->srcFormat) || isGray(c->srcFormat))) {
if (!c->cascaded_context[0] &&
memcmp(c->dstColorspaceTable, c->srcColorspaceTable, sizeof(int) * 4) &&
c->srcW && c->srcH && c->dstW && c->dstH) {
enum AVPixelFormat tmp_format;
int tmp_width, tmp_height;
int srcW = c->srcW;
int srcH = c->srcH;
int dstW = c->dstW;
int dstH = c->dstH;
int ret;
av_log(c, AV_LOG_VERBOSE, "YUV color matrix differs for YUV->YUV, using intermediate RGB to convert\n");
if (isNBPS(c->dstFormat) || is16BPS(c->dstFormat)) {
if (isALPHA(c->srcFormat) && isALPHA(c->dstFormat)) {
tmp_format = AV_PIX_FMT_BGRA64;
} else {
tmp_format = AV_PIX_FMT_BGR48;
}
} else {
if (isALPHA(c->srcFormat) && isALPHA(c->dstFormat)) {
tmp_format = AV_PIX_FMT_BGRA;
} else {
tmp_format = AV_PIX_FMT_BGR24;
}
}
if (srcW*srcH > dstW*dstH) {
tmp_width = dstW;
tmp_height = dstH;
} else {
tmp_width = srcW;
tmp_height = srcH;
}
ret = av_image_alloc(c->cascaded_tmp, c->cascaded_tmpStride,
tmp_width, tmp_height, tmp_format, 64);
if (ret < 0)
return ret;
c->cascaded_context[0] = sws_alloc_set_opts(srcW, srcH, c->srcFormat,
tmp_width, tmp_height, tmp_format,
c->flags, c->param);
if (!c->cascaded_context[0])
return -1;
c->cascaded_context[0]->alphablend = c->alphablend;
ret = sws_init_context(c->cascaded_context[0], NULL , NULL);
if (ret < 0)
return ret;
//we set both src and dst depending on that the RGB side will be ignored
sws_setColorspaceDetails(c->cascaded_context[0], inv_table,
srcRange, table, dstRange,
brightness, contrast, saturation);
c->cascaded_context[1] = sws_getContext(tmp_width, tmp_height, tmp_format,
dstW, dstH, c->dstFormat,
c->flags, NULL, NULL, c->param);
if (!c->cascaded_context[1])
return -1;
sws_setColorspaceDetails(c->cascaded_context[1], inv_table,
srcRange, table, dstRange,
0, 1 << 16, 1 << 16);
return 0;
}
return -1;
}
if (!isYUV(c->dstFormat) && !isGray(c->dstFormat)) {
ff_yuv2rgb_c_init_tables(c, inv_table, srcRange, brightness,
contrast, saturation);
// FIXME factorize
if (ARCH_PPC)
ff_yuv2rgb_init_tables_ppc(c, inv_table, brightness,
contrast, saturation);
}
fill_rgb2yuv_table(c, table, dstRange);
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 )
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_YUVJ411P:
*format = AV_PIX_FMT_YUV411P;
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;
case AV_PIX_FMT_GRAY8:
case AV_PIX_FMT_YA8:
case AV_PIX_FMT_GRAY10LE:
case AV_PIX_FMT_GRAY10BE:
case AV_PIX_FMT_GRAY12LE:
case AV_PIX_FMT_GRAY12BE:
case AV_PIX_FMT_GRAY16LE:
case AV_PIX_FMT_GRAY16BE:
case AV_PIX_FMT_YA16BE:
case AV_PIX_FMT_YA16LE:
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;
}
}
static int handle_xyz(enum AVPixelFormat *format)
{
switch (*format) {
case AV_PIX_FMT_XYZ12BE : *format = AV_PIX_FMT_RGB48BE; return 1;
case AV_PIX_FMT_XYZ12LE : *format = AV_PIX_FMT_RGB48LE; return 1;
default: return 0;
}
}
static void handle_formats(SwsContext *c)
{
c->src0Alpha |= handle_0alpha(&c->srcFormat);
c->dst0Alpha |= handle_0alpha(&c->dstFormat);
c->srcXYZ |= handle_xyz(&c->srcFormat);
c->dstXYZ |= handle_xyz(&c->dstFormat);
if (c->srcXYZ || c->dstXYZ)
fill_xyztables(c);
}
SwsContext *sws_alloc_context(void)
{
SwsContext *c = av_mallocz(sizeof(SwsContext));
av_assert0(offsetof(SwsContext, redDither) + DITHER32_INT == offsetof(SwsContext, dither32));
if (c) {
c->av_class = &ff_sws_context_class;
av_opt_set_defaults(c);
}
return c;
}
static uint16_t * alloc_gamma_tbl(double e)
{
int i = 0;
uint16_t * tbl;
tbl = (uint16_t*)av_malloc(sizeof(uint16_t) * 1 << 16);
if (!tbl)
return NULL;
for (i = 0; i < 65536; ++i) {
tbl[i] = pow(i / 65535.0, e) * 65535.0;
}
return tbl;
}
static enum AVPixelFormat alphaless_fmt(enum AVPixelFormat fmt)
{
switch(fmt) {
case AV_PIX_FMT_ARGB: return AV_PIX_FMT_RGB24;
case AV_PIX_FMT_RGBA: return AV_PIX_FMT_RGB24;
case AV_PIX_FMT_ABGR: return AV_PIX_FMT_BGR24;
case AV_PIX_FMT_BGRA: return AV_PIX_FMT_BGR24;
case AV_PIX_FMT_YA8: return AV_PIX_FMT_GRAY8;
case AV_PIX_FMT_YUVA420P: return AV_PIX_FMT_YUV420P;
case AV_PIX_FMT_YUVA422P: return AV_PIX_FMT_YUV422P;
case AV_PIX_FMT_YUVA444P: return AV_PIX_FMT_YUV444P;
case AV_PIX_FMT_GBRAP: return AV_PIX_FMT_GBRP;
case AV_PIX_FMT_GBRAP10LE: return AV_PIX_FMT_GBRP10;
case AV_PIX_FMT_GBRAP10BE: return AV_PIX_FMT_GBRP10;
case AV_PIX_FMT_GBRAP12LE: return AV_PIX_FMT_GBRP12;
case AV_PIX_FMT_GBRAP12BE: return AV_PIX_FMT_GBRP12;
case AV_PIX_FMT_GBRAP16LE: return AV_PIX_FMT_GBRP16;
case AV_PIX_FMT_GBRAP16BE: return AV_PIX_FMT_GBRP16;
case AV_PIX_FMT_RGBA64LE: return AV_PIX_FMT_RGB48;
case AV_PIX_FMT_RGBA64BE: return AV_PIX_FMT_RGB48;
case AV_PIX_FMT_BGRA64LE: return AV_PIX_FMT_BGR48;
case AV_PIX_FMT_BGRA64BE: return AV_PIX_FMT_BGR48;
case AV_PIX_FMT_YA16BE: return AV_PIX_FMT_GRAY16;
case AV_PIX_FMT_YA16LE: return AV_PIX_FMT_GRAY16;
case AV_PIX_FMT_YUVA420P9BE: return AV_PIX_FMT_YUV420P9;
case AV_PIX_FMT_YUVA422P9BE: return AV_PIX_FMT_YUV422P9;
case AV_PIX_FMT_YUVA444P9BE: return AV_PIX_FMT_YUV444P9;
case AV_PIX_FMT_YUVA420P9LE: return AV_PIX_FMT_YUV420P9;
case AV_PIX_FMT_YUVA422P9LE: return AV_PIX_FMT_YUV422P9;
case AV_PIX_FMT_YUVA444P9LE: return AV_PIX_FMT_YUV444P9;
case AV_PIX_FMT_YUVA420P10BE: return AV_PIX_FMT_YUV420P10;
case AV_PIX_FMT_YUVA422P10BE: return AV_PIX_FMT_YUV422P10;
case AV_PIX_FMT_YUVA444P10BE: return AV_PIX_FMT_YUV444P10;
case AV_PIX_FMT_YUVA420P10LE: return AV_PIX_FMT_YUV420P10;
case AV_PIX_FMT_YUVA422P10LE: return AV_PIX_FMT_YUV422P10;
case AV_PIX_FMT_YUVA444P10LE: return AV_PIX_FMT_YUV444P10;
case AV_PIX_FMT_YUVA420P16BE: return AV_PIX_FMT_YUV420P16;
case AV_PIX_FMT_YUVA422P16BE: return AV_PIX_FMT_YUV422P16;
case AV_PIX_FMT_YUVA444P16BE: return AV_PIX_FMT_YUV444P16;
case AV_PIX_FMT_YUVA420P16LE: return AV_PIX_FMT_YUV420P16;
case AV_PIX_FMT_YUVA422P16LE: return AV_PIX_FMT_YUV422P16;
case AV_PIX_FMT_YUVA444P16LE: return AV_PIX_FMT_YUV444P16;
// case AV_PIX_FMT_AYUV64LE:
// case AV_PIX_FMT_AYUV64BE:
// case AV_PIX_FMT_PAL8:
default: return AV_PIX_FMT_NONE;
}
}
av_cold 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) + 66, 16);
int flags, cpu_flags;
enum AVPixelFormat srcFormat = c->srcFormat;
enum AVPixelFormat dstFormat = c->dstFormat;
const AVPixFmtDescriptor *desc_src;
const AVPixFmtDescriptor *desc_dst;
int ret = 0;
enum AVPixelFormat tmpFmt;
cpu_flags = av_get_cpu_flags();
flags = c->flags;
emms_c();
if (!rgb15to16)
ff_sws_rgb2rgb_init();
unscaled = (srcW == dstW && srcH == dstH);
c->srcRange |= handle_jpeg(&c->srcFormat);
c->dstRange |= handle_jpeg(&c->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");
if (!c->contrast && !c->saturation && !c->dstFormatBpp)
sws_setColorspaceDetails(c, ff_yuv2rgb_coeffs[SWS_CS_DEFAULT], c->srcRange,
ff_yuv2rgb_coeffs[SWS_CS_DEFAULT],
c->dstRange, 0, 1 << 16, 1 << 16);
handle_formats(c);
srcFormat = c->srcFormat;
dstFormat = c->dstFormat;
desc_src = av_pix_fmt_desc_get(srcFormat);
desc_dst = av_pix_fmt_desc_get(dstFormat);
// If the source has no alpha then disable alpha blendaway
if (c->src0Alpha)
c->alphablend = SWS_ALPHA_BLEND_NONE;
if (!(unscaled && sws_isSupportedEndiannessConversion(srcFormat) &&
av_pix_fmt_swap_endianness(srcFormat) == 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);
}
}
av_assert2(desc_src && desc_dst);
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);
/* provide a default scaler if not set by caller */
if (!i) {
if (dstW < srcW && dstH < srcH)
flags |= SWS_BICUBIC;
else if (dstW > srcW && dstH > srcH)
flags |= SWS_BICUBIC;
else
flags |= SWS_BICUBIC;
c->flags = flags;
} else if (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 (flags & SWS_FAST_BILINEAR) {
if (srcW < 8 || dstW < 8) {
flags ^= SWS_FAST_BILINEAR | SWS_BILINEAR;
c->flags = flags;
}
}
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);
av_pix_fmt_get_chroma_sub_sample(srcFormat, &c->chrSrcHSubSample, &c->chrSrcVSubSample);
av_pix_fmt_get_chroma_sub_sample(dstFormat, &c->chrDstHSubSample, &c->chrDstVSubSample);
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 ( c->chrSrcHSubSample == 0
&& c->chrSrcVSubSample == 0
&& c->dither != SWS_DITHER_BAYER //SWS_FULL_CHR_H_INT is currently not supported with SWS_DITHER_BAYER
&& !(c->flags & SWS_FAST_BILINEAR)
) {
av_log(c, AV_LOG_DEBUG, "Forcing full internal H chroma due to input having non subsampled chroma\n");
flags |= SWS_FULL_CHR_H_INT;
c->flags = flags;
}
}
if (c->dither == SWS_DITHER_AUTO) {
if (flags & SWS_ERROR_DIFFUSION)
c->dither = SWS_DITHER_ED;
}
if(dstFormat == AV_PIX_FMT_BGR4_BYTE ||
dstFormat == AV_PIX_FMT_RGB4_BYTE ||
dstFormat == AV_PIX_FMT_BGR8 ||
dstFormat == AV_PIX_FMT_RGB8) {
if (c->dither == SWS_DITHER_AUTO)
c->dither = (flags & SWS_FULL_CHR_H_INT) ? SWS_DITHER_ED : SWS_DITHER_BAYER;
if (!(flags & SWS_FULL_CHR_H_INT)) {
if (c->dither == SWS_DITHER_ED || c->dither == SWS_DITHER_A_DITHER || c->dither == SWS_DITHER_X_DITHER) {
av_log(c, AV_LOG_DEBUG,
"Desired dithering 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_FULL_CHR_H_INT) {
if (c->dither == SWS_DITHER_BAYER) {
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));
c->dither = SWS_DITHER_ED;
}
}
}
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_RGBA64LE &&
dstFormat != AV_PIX_FMT_RGBA64BE &&
dstFormat != AV_PIX_FMT_BGRA64LE &&
dstFormat != AV_PIX_FMT_BGRA64BE &&
dstFormat != AV_PIX_FMT_RGB48LE &&
dstFormat != AV_PIX_FMT_RGB48BE &&
dstFormat != AV_PIX_FMT_BGR48LE &&
dstFormat != AV_PIX_FMT_BGR48BE &&
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_GBRAP10BE && srcFormat != AV_PIX_FMT_GBRAP10LE &&
srcFormat != AV_PIX_FMT_GBRP12BE && srcFormat != AV_PIX_FMT_GBRP12LE &&
srcFormat != AV_PIX_FMT_GBRAP12BE && srcFormat != AV_PIX_FMT_GBRAP12LE &&
srcFormat != AV_PIX_FMT_GBRP14BE && srcFormat != AV_PIX_FMT_GBRP14LE &&
srcFormat != AV_PIX_FMT_GBRP16BE && srcFormat != AV_PIX_FMT_GBRP16LE &&
srcFormat != AV_PIX_FMT_GBRAP16BE && srcFormat != AV_PIX_FMT_GBRAP16LE &&
((dstW >> c->chrDstHSubSample) <= (srcW >> 1) ||
(flags & SWS_FAST_BILINEAR)))
c->chrSrcHSubSample = 1;
// Note the AV_CEIL_RSHIFT is so that we always round toward +inf.
c->chrSrcW = AV_CEIL_RSHIFT(srcW, c->chrSrcHSubSample);
c->chrSrcH = AV_CEIL_RSHIFT(srcH, c->chrSrcVSubSample);
c->chrDstW = AV_CEIL_RSHIFT(dstW, c->chrDstHSubSample);
c->chrDstH = AV_CEIL_RSHIFT(dstH, c->chrDstVSubSample);
FF_ALLOCZ_OR_GOTO(c, c->formatConvBuffer, FFALIGN(srcW*2+78, 16) * 2, fail);
c->srcBpc = desc_src->comp[0].depth;
if (c->srcBpc < 8)
c->srcBpc = 8;
c->dstBpc = desc_dst->comp[0].depth;
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 &&
c->chrDstW >= c->chrSrcW &&
(srcW & 15) == 0;
if (!c->canMMXEXTBeUsed && dstW >= srcW && c->chrDstW >= c->chrSrcW && (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;
}
}
// hardcoded for now
c->gamma_value = 2.2;
tmpFmt = AV_PIX_FMT_RGBA64LE;
if (!unscaled && c->gamma_flag && (srcFormat != tmpFmt || dstFormat != tmpFmt)) {
SwsContext *c2;
c->cascaded_context[0] = NULL;
ret = av_image_alloc(c->cascaded_tmp, c->cascaded_tmpStride,
srcW, srcH, tmpFmt, 64);
if (ret < 0)
return ret;
c->cascaded_context[0] = sws_getContext(srcW, srcH, srcFormat,
srcW, srcH, tmpFmt,
flags, NULL, NULL, c->param);
if (!c->cascaded_context[0]) {
return -1;
}
c->cascaded_context[1] = sws_getContext(srcW, srcH, tmpFmt,
dstW, dstH, tmpFmt,
flags, srcFilter, dstFilter, c->param);
if (!c->cascaded_context[1])
return -1;
c2 = c->cascaded_context[1];
c2->is_internal_gamma = 1;
c2->gamma = alloc_gamma_tbl( c->gamma_value);
c2->inv_gamma = alloc_gamma_tbl(1.f/c->gamma_value);
if (!c2->gamma || !c2->inv_gamma)
return AVERROR(ENOMEM);
// is_internal_flag is set after creating the context
// to properly create the gamma convert FilterDescriptor
// we have to re-initialize it
ff_free_filters(c2);
if (ff_init_filters(c2) < 0) {
sws_freeContext(c2);
return -1;
}
c->cascaded_context[2] = NULL;
if (dstFormat != tmpFmt) {
ret = av_image_alloc(c->cascaded1_tmp, c->cascaded1_tmpStride,
dstW, dstH, tmpFmt, 64);
if (ret < 0)
return ret;
c->cascaded_context[2] = sws_getContext(dstW, dstH, tmpFmt,
dstW, dstH, dstFormat,
flags, NULL, NULL, c->param);
if (!c->cascaded_context[2])
return -1;
}
return 0;
}
if (isBayer(srcFormat)) {
if (!unscaled ||
(dstFormat != AV_PIX_FMT_RGB24 && dstFormat != AV_PIX_FMT_YUV420P)) {
enum AVPixelFormat tmpFormat = AV_PIX_FMT_RGB24;
ret = av_image_alloc(c->cascaded_tmp, c->cascaded_tmpStride,
srcW, srcH, tmpFormat, 64);
if (ret < 0)
return ret;
c->cascaded_context[0] = sws_getContext(srcW, srcH, srcFormat,
srcW, srcH, tmpFormat,
flags, srcFilter, NULL, c->param);
if (!c->cascaded_context[0])
return -1;
c->cascaded_context[1] = sws_getContext(srcW, srcH, tmpFormat,
dstW, dstH, dstFormat,
flags, NULL, dstFilter, c->param);
if (!c->cascaded_context[1])
return -1;
return 0;
}
}
if (CONFIG_SWSCALE_ALPHA && isALPHA(srcFormat) && !isALPHA(dstFormat)) {
enum AVPixelFormat tmpFormat = alphaless_fmt(srcFormat);
if (tmpFormat != AV_PIX_FMT_NONE && c->alphablend != SWS_ALPHA_BLEND_NONE)
if (!unscaled ||
dstFormat != tmpFormat ||
usesHFilter || usesVFilter ||
c->srcRange != c->dstRange
) {
c->cascaded_mainindex = 1;
ret = av_image_alloc(c->cascaded_tmp, c->cascaded_tmpStride,
srcW, srcH, tmpFormat, 64);
if (ret < 0)
return ret;
c->cascaded_context[0] = sws_alloc_set_opts(srcW, srcH, srcFormat,
srcW, srcH, tmpFormat,
flags, c->param);
if (!c->cascaded_context[0])
return -1;
c->cascaded_context[0]->alphablend = c->alphablend;
ret = sws_init_context(c->cascaded_context[0], NULL , NULL);
if (ret < 0)
return ret;
c->cascaded_context[1] = sws_alloc_set_opts(srcW, srcH, tmpFormat,
dstW, dstH, dstFormat,
flags, c->param);
if (!c->cascaded_context[1])
return -1;
c->cascaded_context[1]->srcRange = c->srcRange;
c->cascaded_context[1]->dstRange = c->dstRange;
ret = sws_init_context(c->cascaded_context[1], srcFilter , dstFilter);
if (ret < 0)
return ret;
return 0;
}
}
#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 = ff_init_hscaler_mmxext(dstW, c->lumXInc, NULL,
NULL, NULL, 8);
c->chrMmxextFilterCodeSize = ff_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);
ff_init_hscaler_mmxext( dstW, c->lumXInc, c->lumMmxextFilterCode,
c->hLumFilter, (uint32_t*)c->hLumFilterPos, 8);
ff_init_hscaler_mmxext(c->chrDstW, c->chrXInc, c->chrMmxextFilterCode,
c->hChrFilter, (uint32_t*)c->hChrFilterPos, 4);
#if USE_MMAP
if ( mprotect(c->lumMmxextFilterCode, c->lumMmxextFilterCodeSize, PROT_EXEC | PROT_READ) == -1
|| mprotect(c->chrMmxextFilterCode, c->chrMmxextFilterCodeSize, PROT_EXEC | PROT_READ) == -1) {
av_log(c, AV_LOG_ERROR, "mprotect failed, cannot use fast bilinear scaler\n");
goto fail;
}
#endif
} else
#endif /* HAVE_MMXEXT_INLINE */
{
const int filterAlign = X86_MMX(cpu_flags) ? 4 :
PPC_ALTIVEC(cpu_flags) ? 8 :
have_neon(cpu_flags) ? 8 : 1;
if ((ret = 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,
get_local_pos(c, 0, 0, 0),
get_local_pos(c, 0, 0, 0))) < 0)
goto fail;
if ((ret = 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,
get_local_pos(c, c->chrSrcHSubSample, c->src_h_chr_pos, 0),
get_local_pos(c, c->chrDstHSubSample, c->dst_h_chr_pos, 0))) < 0)
goto fail;
}
} // initialize horizontal stuff
/* precalculate vertical scaler filter coefficients */
{
const int filterAlign = X86_MMX(cpu_flags) ? 2 :
PPC_ALTIVEC(cpu_flags) ? 8 :
have_neon(cpu_flags) ? 2 : 1;
if ((ret = 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,
get_local_pos(c, 0, 0, 1),
get_local_pos(c, 0, 0, 1))) < 0)
goto fail;
if ((ret = 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,
get_local_pos(c, c->chrSrcVSubSample, c->src_v_chr_pos, 1),
get_local_pos(c, c->chrDstVSubSample, c->dst_v_chr_pos, 1))) < 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
}
for (i = 0; i < 4; i++)
FF_ALLOCZ_OR_GOTO(c, c->dither_error[i], (c->dstW+2) * sizeof(int), fail);
c->needAlpha = (CONFIG_SWSCALE_ALPHA && isALPHA(c->srcFormat) && isALPHA(c->dstFormat)) ? 1 : 0;
// 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;
av_assert0(c->chrDstH <= dstH);
if (flags & SWS_PRINT_INFO) {
const char *scaler = NULL, *cpucaps;
for (i = 0; i < FF_ARRAY_ELEMS(scale_algorithms); i++) {
if (flags & scale_algorithms[i].flag) {
scaler = scale_algorithms[i].description;
break;
}
}
if (!scaler)
scaler = "ehh flags invalid?!";
av_log(c, AV_LOG_INFO, "%s scaler, from %s to %s%s ",
scaler,
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))
cpucaps = "MMXEXT";
else if (INLINE_AMD3DNOW(cpu_flags))
cpucaps = "3DNOW";
else if (INLINE_MMX(cpu_flags))
cpucaps = "MMX";
else if (PPC_ALTIVEC(cpu_flags))
cpucaps = "AltiVec";
else
cpucaps = "C";
av_log(c, AV_LOG_INFO, "using %s\n", cpucaps);
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);
}
/* alpha blend special case, note this has been split via cascaded contexts if its scaled */
if (unscaled && !usesHFilter && !usesVFilter &&
c->alphablend != SWS_ALPHA_BLEND_NONE &&
isALPHA(srcFormat) &&
(c->srcRange == c->dstRange || isAnyRGB(dstFormat)) &&
alphaless_fmt(srcFormat) == dstFormat
) {
c->swscale = ff_sws_alphablendaway;
if (flags & SWS_PRINT_INFO)
av_log(c, AV_LOG_INFO,
"using alpha blendaway %s -> %s special converter\n",
av_get_pix_fmt_name(srcFormat), av_get_pix_fmt_name(dstFormat));
return 0;
}
/* 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->swscale = ff_getSwsFunc(c);
return ff_init_filters(c);
fail: // FIXME replace things by appropriate error codes
if (ret == RETCODE_USE_CASCADE) {
int tmpW = sqrt(srcW * (int64_t)dstW);
int tmpH = sqrt(srcH * (int64_t)dstH);
enum AVPixelFormat tmpFormat = AV_PIX_FMT_YUV420P;
if (isALPHA(srcFormat))
tmpFormat = AV_PIX_FMT_YUVA420P;
if (srcW*(int64_t)srcH <= 4LL*dstW*dstH)
return AVERROR(EINVAL);
ret = av_image_alloc(c->cascaded_tmp, c->cascaded_tmpStride,
tmpW, tmpH, tmpFormat, 64);
if (ret < 0)
return ret;
c->cascaded_context[0] = sws_getContext(srcW, srcH, srcFormat,
tmpW, tmpH, tmpFormat,
flags, srcFilter, NULL, c->param);
if (!c->cascaded_context[0])
return -1;
c->cascaded_context[1] = sws_getContext(tmpW, tmpH, tmpFormat,
dstW, dstH, dstFormat,
flags, NULL, dstFilter, c->param);
if (!c->cascaded_context[1])
return -1;
return 0;
}
return -1;
}
SwsContext *sws_alloc_set_opts(int srcW, int srcH, enum AVPixelFormat srcFormat,
int dstW, int dstH, enum AVPixelFormat dstFormat,
int flags, 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->srcFormat = srcFormat;
c->dstFormat = dstFormat;
if (param) {
c->param[0] = param[0];
c->param[1] = param[1];
}
return c;
}
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;
c = sws_alloc_set_opts(srcW, srcH, srcFormat,
dstW, dstH, dstFormat,
flags, param);
if (!c)
return NULL;
if (sws_init_context(c, srcFilter, dstFilter) < 0) {
sws_freeContext(c);
return NULL;
}
return c;
}
static int isnan_vec(SwsVector *a)
{
int i;
for (i=0; i<a->length; i++)
if (isnan(a->coeff[i]))
return 1;
return 0;
}
static void makenan_vec(SwsVector *a)
{
int i;
for (i=0; i<a->length; i++)
a->coeff[i] = NAN;
}
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 (!filter->lumH || !filter->lumV || !filter->chrH || !filter->chrV)
goto fail;
if (chromaSharpen != 0.0) {
SwsVector *id = sws_getIdentityVec();
if (!id)
goto fail;
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();
if (!id)
goto fail;
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 (isnan_vec(filter->chrH) ||
isnan_vec(filter->chrV) ||
isnan_vec(filter->lumH) ||
isnan_vec(filter->lumV))
goto fail;
if (verbose)
sws_printVec2(filter->chrH, NULL, AV_LOG_DEBUG);
if (verbose)
sws_printVec2(filter->lumH, NULL, AV_LOG_DEBUG);
return filter;
fail:
sws_freeVec(filter->lumH);
sws_freeVec(filter->lumV);
sws_freeVec(filter->chrH);
sws_freeVec(filter->chrV);
av_freep(&filter);
return NULL;
}
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;
}
/**
* Allocate and return a vector with length coefficients, all
* with the same value c.
*/
#if !FF_API_SWS_VECTOR
static
#endif
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;
}
/**
* Allocate and return a vector with just one coefficient, with
* value 1.0.
*/
#if !FF_API_SWS_VECTOR
static
#endif
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));
}
#if FF_API_SWS_VECTOR
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;
}
#endif
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;
}
#if FF_API_SWS_VECTOR
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;
}
#endif
/* 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;
}
#if !FF_API_SWS_VECTOR
static
#endif
void sws_shiftVec(SwsVector *a, int shift)
{
SwsVector *shifted = sws_getShiftedVec(a, shift);
if (!shifted) {
makenan_vec(a);
return;
}
av_free(a->coeff);
a->coeff = shifted->coeff;
a->length = shifted->length;
av_free(shifted);
}
#if !FF_API_SWS_VECTOR
static
#endif
void sws_addVec(SwsVector *a, SwsVector *b)
{
SwsVector *sum = sws_sumVec(a, b);
if (!sum) {
makenan_vec(a);
return;
}
av_free(a->coeff);
a->coeff = sum->coeff;
a->length = sum->length;
av_free(sum);
}
#if FF_API_SWS_VECTOR
void sws_subVec(SwsVector *a, SwsVector *b)
{
SwsVector *diff = sws_diffVec(a, b);
if (!diff) {
makenan_vec(a);
return;
}
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);
if (!conv) {
makenan_vec(a);
return;
}
av_free(a->coeff);
a->coeff = conv->coeff;
a->length = conv->length;
av_free(conv);
}
SwsVector *sws_cloneVec(SwsVector *a)
{
SwsVector *vec = sws_allocVec(a->length);
if (!vec)
return NULL;
memcpy(vec->coeff, a->coeff, a->length * sizeof(*a->coeff));
return vec;
}
#endif
/**
* Print with av_log() a textual representation of the vector a
* if log_level <= av_log_level.
*/
#if !FF_API_SWS_VECTOR
static
#endif
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;
sws_freeVec(filter->lumH);
sws_freeVec(filter->lumV);
sws_freeVec(filter->chrH);
sws_freeVec(filter->chrV);
av_free(filter);
}
void sws_freeContext(SwsContext *c)
{
int i;
if (!c)
return;
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);
sws_freeContext(c->cascaded_context[0]);
sws_freeContext(c->cascaded_context[1]);
sws_freeContext(c->cascaded_context[2]);
memset(c->cascaded_context, 0, sizeof(c->cascaded_context));
av_freep(&c->cascaded_tmp[0]);
av_freep(&c->cascaded1_tmp[0]);
av_freep(&c->gamma);
av_freep(&c->inv_gamma);
ff_free_filters(c);
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 };
int64_t src_h_chr_pos = -513, dst_h_chr_pos = -513,
src_v_chr_pos = -513, dst_v_chr_pos = -513;
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])) {
av_opt_get_int(context, "src_h_chr_pos", 0, &src_h_chr_pos);
av_opt_get_int(context, "src_v_chr_pos", 0, &src_v_chr_pos);
av_opt_get_int(context, "dst_h_chr_pos", 0, &dst_h_chr_pos);
av_opt_get_int(context, "dst_v_chr_pos", 0, &dst_v_chr_pos);
sws_freeContext(context);
context = NULL;
}
if (!context) {
if (!(context = sws_alloc_context()))
return NULL;
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];
av_opt_set_int(context, "src_h_chr_pos", src_h_chr_pos, 0);
av_opt_set_int(context, "src_v_chr_pos", src_v_chr_pos, 0);
av_opt_set_int(context, "dst_h_chr_pos", dst_h_chr_pos, 0);
av_opt_set_int(context, "dst_v_chr_pos", dst_v_chr_pos, 0);
if (sws_init_context(context, srcFilter, dstFilter) < 0) {
sws_freeContext(context);
return NULL;
}
}
return context;
}
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