/
swscale_internal.h
531 lines (482 loc) · 22.8 KB
/
swscale_internal.h
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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
*/
#ifndef SWSCALE_SWSCALE_INTERNAL_H
#define SWSCALE_SWSCALE_INTERNAL_H
#include "config.h"
#if HAVE_ALTIVEC_H
#include <altivec.h>
#endif
#include "libavutil/avutil.h"
#define STR(s) AV_TOSTRING(s) //AV_STRINGIFY is too long
#define FAST_BGR2YV12 //use 7-bit instead of 15-bit coefficients
#define MAX_FILTER_SIZE 256
#define DITHER1XBPP
#if HAVE_BIGENDIAN
#define ALT32_CORR (-1)
#else
#define ALT32_CORR 1
#endif
#if ARCH_X86_64
# define APCK_PTR2 8
# define APCK_COEF 16
# define APCK_SIZE 24
#else
# define APCK_PTR2 4
# define APCK_COEF 8
# define APCK_SIZE 16
#endif
struct SwsContext;
typedef int (*SwsFunc)(struct SwsContext *context, const uint8_t* src[],
int srcStride[], int srcSliceY, int srcSliceH,
uint8_t* dst[], int dstStride[]);
typedef void (*yuv2planar1_fn) (struct SwsContext *c,
const int16_t *lumSrc, const int16_t *chrUSrc,
const int16_t *chrVSrc, const int16_t *alpSrc,
uint8_t *dest,
uint8_t *uDest, uint8_t *vDest, uint8_t *aDest,
int dstW, int chrDstW, const uint8_t *lumDither, const uint8_t *chrDither);
typedef void (*yuv2planarX_fn) (struct SwsContext *c,
const int16_t *lumFilter, const int16_t **lumSrc, int lumFilterSize,
const int16_t *chrFilter, const int16_t **chrUSrc,
const int16_t **chrVSrc, int chrFilterSize,
const int16_t **alpSrc,
uint8_t *dest,
uint8_t *uDest, uint8_t *vDest, uint8_t *aDest,
int dstW, int chrDstW, const uint8_t *lumDither, const uint8_t *chrDither);
typedef void (*yuv2packed1_fn) (struct SwsContext *c,
const uint16_t *buf0,
const uint16_t *ubuf0, const uint16_t *ubuf1,
const uint16_t *vbuf0, const uint16_t *vbuf1,
const uint16_t *abuf0,
uint8_t *dest,
int dstW, int uvalpha, int dstFormat, int flags, int y);
typedef void (*yuv2packed2_fn) (struct SwsContext *c,
const uint16_t *buf0, const uint16_t *buf1,
const uint16_t *ubuf0, const uint16_t *ubuf1,
const uint16_t *vbuf0, const uint16_t *vbuf1,
const uint16_t *abuf0, const uint16_t *abuf1,
uint8_t *dest,
int dstW, int yalpha, int uvalpha, int y);
typedef void (*yuv2packedX_fn) (struct SwsContext *c,
const int16_t *lumFilter, const int16_t **lumSrc, int lumFilterSize,
const int16_t *chrFilter, const int16_t **chrUSrc,
const int16_t **chrVSrc, int chrFilterSize,
const int16_t **alpSrc, uint8_t *dest,
int dstW, int dstY);
/* This struct should be aligned on at least a 32-byte boundary. */
typedef struct SwsContext {
/**
* info on struct for av_log
*/
const AVClass *av_class;
/**
* Note that src, dst, srcStride, dstStride will be copied in the
* sws_scale() wrapper so they can be freely modified here.
*/
SwsFunc swScale;
int srcW; ///< Width of source luma/alpha planes.
int srcH; ///< Height of source luma/alpha planes.
int dstH; ///< Height of destination luma/alpha planes.
int chrSrcW; ///< Width of source chroma planes.
int chrSrcH; ///< Height of source chroma planes.
int chrDstW; ///< Width of destination chroma planes.
int chrDstH; ///< Height of destination chroma planes.
int lumXInc, chrXInc;
int lumYInc, chrYInc;
enum PixelFormat dstFormat; ///< Destination pixel format.
enum PixelFormat srcFormat; ///< Source pixel format.
int dstFormatBpp; ///< Number of bits per pixel of the destination pixel format.
int srcFormatBpp; ///< Number of bits per pixel of the source pixel format.
int chrSrcHSubSample; ///< Binary logarithm of horizontal subsampling factor between luma/alpha and chroma planes in source image.
int chrSrcVSubSample; ///< Binary logarithm of vertical subsampling factor between luma/alpha and chroma planes in source image.
int chrDstHSubSample; ///< Binary logarithm of horizontal subsampling factor between luma/alpha and chroma planes in destination image.
int chrDstVSubSample; ///< Binary logarithm of vertical subsampling factor between luma/alpha and chroma planes in destination image.
int vChrDrop; ///< Binary logarithm of extra vertical subsampling factor in source image chroma planes specified by user.
int sliceDir; ///< Direction that slices are fed to the scaler (1 = top-to-bottom, -1 = bottom-to-top).
double param[2]; ///< Input parameters for scaling algorithms that need them.
uint32_t pal_yuv[256];
uint32_t pal_rgb[256];
/**
* @name Scaled horizontal lines ring buffer.
* The horizontal scaler keeps just enough scaled lines in a ring buffer
* so they may be passed to the vertical scaler. The pointers to the
* allocated buffers for each line are duplicated in sequence in the ring
* buffer to simplify indexing and avoid wrapping around between lines
* inside the vertical scaler code. The wrapping is done before the
* vertical scaler is called.
*/
//@{
int16_t **lumPixBuf; ///< Ring buffer for scaled horizontal luma plane lines to be fed to the vertical scaler.
int16_t **chrUPixBuf; ///< Ring buffer for scaled horizontal chroma plane lines to be fed to the vertical scaler.
int16_t **chrVPixBuf; ///< Ring buffer for scaled horizontal chroma plane lines to be fed to the vertical scaler.
int16_t **alpPixBuf; ///< Ring buffer for scaled horizontal alpha plane lines to be fed to the vertical scaler.
int vLumBufSize; ///< Number of vertical luma/alpha lines allocated in the ring buffer.
int vChrBufSize; ///< Number of vertical chroma lines allocated in the ring buffer.
int lastInLumBuf; ///< Last scaled horizontal luma/alpha line from source in the ring buffer.
int lastInChrBuf; ///< Last scaled horizontal chroma line from source in the ring buffer.
int lumBufIndex; ///< Index in ring buffer of the last scaled horizontal luma/alpha line from source.
int chrBufIndex; ///< Index in ring buffer of the last scaled horizontal chroma line from source.
//@}
uint8_t *formatConvBuffer;
/**
* @name Horizontal and vertical filters.
* To better understand the following fields, here is a pseudo-code of
* their usage in filtering a horizontal line:
* @code
* for (i = 0; i < width; i++) {
* dst[i] = 0;
* for (j = 0; j < filterSize; j++)
* dst[i] += src[ filterPos[i] + j ] * filter[ filterSize * i + j ];
* dst[i] >>= FRAC_BITS; // The actual implementation is fixed-point.
* }
* @endcode
*/
//@{
int16_t *hLumFilter; ///< Array of horizontal filter coefficients for luma/alpha planes.
int16_t *hChrFilter; ///< Array of horizontal filter coefficients for chroma planes.
int16_t *vLumFilter; ///< Array of vertical filter coefficients for luma/alpha planes.
int16_t *vChrFilter; ///< Array of vertical filter coefficients for chroma planes.
int16_t *hLumFilterPos; ///< Array of horizontal filter starting positions for each dst[i] for luma/alpha planes.
int16_t *hChrFilterPos; ///< Array of horizontal filter starting positions for each dst[i] for chroma planes.
int16_t *vLumFilterPos; ///< Array of vertical filter starting positions for each dst[i] for luma/alpha planes.
int16_t *vChrFilterPos; ///< Array of vertical filter starting positions for each dst[i] for chroma planes.
int hLumFilterSize; ///< Horizontal filter size for luma/alpha pixels.
int hChrFilterSize; ///< Horizontal filter size for chroma pixels.
int vLumFilterSize; ///< Vertical filter size for luma/alpha pixels.
int vChrFilterSize; ///< Vertical filter size for chroma pixels.
//@}
int lumMmx2FilterCodeSize; ///< Runtime-generated MMX2 horizontal fast bilinear scaler code size for luma/alpha planes.
int chrMmx2FilterCodeSize; ///< Runtime-generated MMX2 horizontal fast bilinear scaler code size for chroma planes.
uint8_t *lumMmx2FilterCode; ///< Runtime-generated MMX2 horizontal fast bilinear scaler code for luma/alpha planes.
uint8_t *chrMmx2FilterCode; ///< Runtime-generated MMX2 horizontal fast bilinear scaler code for chroma planes.
int canMMX2BeUsed;
int dstY; ///< Last destination vertical line output from last slice.
int flags; ///< Flags passed by the user to select scaler algorithm, optimizations, subsampling, etc...
void * yuvTable; // pointer to the yuv->rgb table start so it can be freed()
uint8_t * table_rV[256];
uint8_t * table_gU[256];
int table_gV[256];
uint8_t * table_bU[256];
//Colorspace stuff
int contrast, brightness, saturation; // for sws_getColorspaceDetails
int srcColorspaceTable[4];
int dstColorspaceTable[4];
int srcRange; ///< 0 = MPG YUV range, 1 = JPG YUV range (source image).
int dstRange; ///< 0 = MPG YUV range, 1 = JPG YUV range (destination image).
int yuv2rgb_y_offset;
int yuv2rgb_y_coeff;
int yuv2rgb_v2r_coeff;
int yuv2rgb_v2g_coeff;
int yuv2rgb_u2g_coeff;
int yuv2rgb_u2b_coeff;
#define RED_DITHER "0*8"
#define GREEN_DITHER "1*8"
#define BLUE_DITHER "2*8"
#define Y_COEFF "3*8"
#define VR_COEFF "4*8"
#define UB_COEFF "5*8"
#define VG_COEFF "6*8"
#define UG_COEFF "7*8"
#define Y_OFFSET "8*8"
#define U_OFFSET "9*8"
#define V_OFFSET "10*8"
#define LUM_MMX_FILTER_OFFSET "11*8"
#define CHR_MMX_FILTER_OFFSET "11*8+4*4*256"
#define DSTW_OFFSET "11*8+4*4*256*2" //do not change, it is hardcoded in the ASM
#define ESP_OFFSET "11*8+4*4*256*2+8"
#define VROUNDER_OFFSET "11*8+4*4*256*2+16"
#define U_TEMP "11*8+4*4*256*2+24"
#define V_TEMP "11*8+4*4*256*2+32"
#define Y_TEMP "11*8+4*4*256*2+40"
#define ALP_MMX_FILTER_OFFSET "11*8+4*4*256*2+48"
#define UV_OFF "11*8+4*4*256*3+48"
#define UV_OFFx2 "11*8+4*4*256*3+56"
#define DITHER16 "11*8+4*4*256*3+64"
#define DITHER32 "11*8+4*4*256*3+64+16"
DECLARE_ALIGNED(8, uint64_t, redDither);
DECLARE_ALIGNED(8, uint64_t, greenDither);
DECLARE_ALIGNED(8, uint64_t, blueDither);
DECLARE_ALIGNED(8, uint64_t, yCoeff);
DECLARE_ALIGNED(8, uint64_t, vrCoeff);
DECLARE_ALIGNED(8, uint64_t, ubCoeff);
DECLARE_ALIGNED(8, uint64_t, vgCoeff);
DECLARE_ALIGNED(8, uint64_t, ugCoeff);
DECLARE_ALIGNED(8, uint64_t, yOffset);
DECLARE_ALIGNED(8, uint64_t, uOffset);
DECLARE_ALIGNED(8, uint64_t, vOffset);
int32_t lumMmxFilter[4*MAX_FILTER_SIZE];
int32_t chrMmxFilter[4*MAX_FILTER_SIZE];
int dstW; ///< Width of destination luma/alpha planes.
DECLARE_ALIGNED(8, uint64_t, esp);
DECLARE_ALIGNED(8, uint64_t, vRounder);
DECLARE_ALIGNED(8, uint64_t, u_temp);
DECLARE_ALIGNED(8, uint64_t, v_temp);
DECLARE_ALIGNED(8, uint64_t, y_temp);
int32_t alpMmxFilter[4*MAX_FILTER_SIZE];
DECLARE_ALIGNED(8, ptrdiff_t, uv_off); ///< offset (in pixels) between u and v planes
DECLARE_ALIGNED(8, ptrdiff_t, uv_offx2); ///< offset (in bytes) between u and v planes
uint16_t dither16[8];
uint32_t dither32[8];
#if HAVE_ALTIVEC
vector signed short CY;
vector signed short CRV;
vector signed short CBU;
vector signed short CGU;
vector signed short CGV;
vector signed short OY;
vector unsigned short CSHIFT;
vector signed short *vYCoeffsBank, *vCCoeffsBank;
#endif
#if ARCH_BFIN
DECLARE_ALIGNED(4, uint32_t, oy);
DECLARE_ALIGNED(4, uint32_t, oc);
DECLARE_ALIGNED(4, uint32_t, zero);
DECLARE_ALIGNED(4, uint32_t, cy);
DECLARE_ALIGNED(4, uint32_t, crv);
DECLARE_ALIGNED(4, uint32_t, rmask);
DECLARE_ALIGNED(4, uint32_t, cbu);
DECLARE_ALIGNED(4, uint32_t, bmask);
DECLARE_ALIGNED(4, uint32_t, cgu);
DECLARE_ALIGNED(4, uint32_t, cgv);
DECLARE_ALIGNED(4, uint32_t, gmask);
#endif
#if HAVE_VIS
DECLARE_ALIGNED(8, uint64_t, sparc_coeffs)[10];
#endif
/* function pointers for swScale() */
yuv2planar1_fn yuv2yuv1;
yuv2planarX_fn yuv2yuvX;
yuv2packed1_fn yuv2packed1;
yuv2packed2_fn yuv2packed2;
yuv2packedX_fn yuv2packedX;
void (*lumToYV12)(uint8_t *dst, const uint8_t *src,
int width, uint32_t *pal); ///< Unscaled conversion of luma plane to YV12 for horizontal scaler.
void (*alpToYV12)(uint8_t *dst, const uint8_t *src,
int width, uint32_t *pal); ///< Unscaled conversion of alpha plane to YV12 for horizontal scaler.
void (*chrToYV12)(uint8_t *dstU, uint8_t *dstV,
const uint8_t *src1, const uint8_t *src2,
int width, uint32_t *pal); ///< Unscaled conversion of chroma planes to YV12 for horizontal scaler.
void (*hyscale_fast)(struct SwsContext *c,
int16_t *dst, int dstWidth,
const uint8_t *src, int srcW, int xInc);
void (*hcscale_fast)(struct SwsContext *c,
int16_t *dst1, int16_t *dst2, int dstWidth,
const uint8_t *src1, const uint8_t *src2,
int srcW, int xInc);
void (*hScale)(int16_t *dst, int dstW, const uint8_t *src, int srcW,
int xInc, const int16_t *filter, const int16_t *filterPos,
int filterSize);
void (*hScale16)(int16_t *dst, int dstW, const uint16_t *src, int srcW,
int xInc, const int16_t *filter, const int16_t *filterPos,
long filterSize, int shift);
void (*lumConvertRange)(int16_t *dst, int width); ///< Color range conversion function for luma plane if needed.
void (*chrConvertRange)(int16_t *dst1, int16_t *dst2, int width); ///< Color range conversion function for chroma planes if needed.
int needs_hcscale; ///< Set if there are chroma planes to be converted.
} SwsContext;
//FIXME check init (where 0)
SwsFunc ff_yuv2rgb_get_func_ptr(SwsContext *c);
int ff_yuv2rgb_c_init_tables(SwsContext *c, const int inv_table[4],
int fullRange, int brightness,
int contrast, int saturation);
void ff_yuv2rgb_init_tables_altivec(SwsContext *c, const int inv_table[4],
int brightness, int contrast, int saturation);
void updateMMXDitherTables(SwsContext *c, int dstY, int lumBufIndex, int chrBufIndex,
int lastInLumBuf, int lastInChrBuf);
SwsFunc ff_yuv2rgb_init_mmx(SwsContext *c);
SwsFunc ff_yuv2rgb_init_vis(SwsContext *c);
SwsFunc ff_yuv2rgb_init_mlib(SwsContext *c);
SwsFunc ff_yuv2rgb_init_altivec(SwsContext *c);
SwsFunc ff_yuv2rgb_get_func_ptr_bfin(SwsContext *c);
void ff_bfin_get_unscaled_swscale(SwsContext *c);
#if FF_API_SWS_FORMAT_NAME
/**
* @deprecated Use av_get_pix_fmt_name() instead.
*/
attribute_deprecated
const char *sws_format_name(enum PixelFormat format);
#endif
//FIXME replace this with something faster
#define is16BPS(x) ( \
(x)==PIX_FMT_GRAY16BE \
|| (x)==PIX_FMT_GRAY16LE \
|| (x)==PIX_FMT_BGR48BE \
|| (x)==PIX_FMT_BGR48LE \
|| (x)==PIX_FMT_RGB48BE \
|| (x)==PIX_FMT_RGB48LE \
|| (x)==PIX_FMT_YUV420P16LE \
|| (x)==PIX_FMT_YUV422P16LE \
|| (x)==PIX_FMT_YUV444P16LE \
|| (x)==PIX_FMT_YUV420P16BE \
|| (x)==PIX_FMT_YUV422P16BE \
|| (x)==PIX_FMT_YUV444P16BE \
)
#define isNBPS(x) ( \
(x)==PIX_FMT_YUV420P9LE \
|| (x)==PIX_FMT_YUV420P9BE \
|| (x)==PIX_FMT_YUV444P9BE \
|| (x)==PIX_FMT_YUV444P9LE \
|| (x)==PIX_FMT_YUV422P10BE \
|| (x)==PIX_FMT_YUV422P10LE \
|| (x)==PIX_FMT_YUV444P10BE \
|| (x)==PIX_FMT_YUV444P10LE \
|| (x)==PIX_FMT_YUV420P10LE \
|| (x)==PIX_FMT_YUV420P10BE \
|| (x)==PIX_FMT_YUV422P10LE \
|| (x)==PIX_FMT_YUV422P10BE \
)
#define is9_OR_10BPS isNBPS //for ronald
#define isBE(x) ((x)&1)
#define isPlanar8YUV(x) ( \
(x)==PIX_FMT_YUV410P \
|| (x)==PIX_FMT_YUV420P \
|| (x)==PIX_FMT_YUVA420P \
|| (x)==PIX_FMT_YUV411P \
|| (x)==PIX_FMT_YUV422P \
|| (x)==PIX_FMT_YUV444P \
|| (x)==PIX_FMT_YUV440P \
|| (x)==PIX_FMT_NV12 \
|| (x)==PIX_FMT_NV21 \
)
#define isPlanarYUV(x) ( \
isPlanar8YUV(x) \
|| (x)==PIX_FMT_YUV420P9LE \
|| (x)==PIX_FMT_YUV444P9LE \
|| (x)==PIX_FMT_YUV420P10LE \
|| (x)==PIX_FMT_YUV422P10LE \
|| (x)==PIX_FMT_YUV444P10LE \
|| (x)==PIX_FMT_YUV420P16LE \
|| (x)==PIX_FMT_YUV422P10LE \
|| (x)==PIX_FMT_YUV422P16LE \
|| (x)==PIX_FMT_YUV444P16LE \
|| (x)==PIX_FMT_YUV420P9BE \
|| (x)==PIX_FMT_YUV444P9BE \
|| (x)==PIX_FMT_YUV420P10BE \
|| (x)==PIX_FMT_YUV422P10BE \
|| (x)==PIX_FMT_YUV444P10BE \
|| (x)==PIX_FMT_YUV420P16BE \
|| (x)==PIX_FMT_YUV422P10BE \
|| (x)==PIX_FMT_YUV422P16BE \
|| (x)==PIX_FMT_YUV444P16BE \
)
#define isYUV(x) ( \
(x)==PIX_FMT_UYVY422 \
|| (x)==PIX_FMT_YUYV422 \
|| isPlanarYUV(x) \
)
#define isGray(x) ( \
(x)==PIX_FMT_GRAY8 \
|| (x)==PIX_FMT_GRAY8A \
|| (x)==PIX_FMT_GRAY16BE \
|| (x)==PIX_FMT_GRAY16LE \
)
#define isGray16(x) ( \
(x)==PIX_FMT_GRAY16BE \
|| (x)==PIX_FMT_GRAY16LE \
)
#define isRGBinInt(x) ( \
(x)==PIX_FMT_RGB48BE \
|| (x)==PIX_FMT_RGB48LE \
|| (x)==PIX_FMT_RGB32 \
|| (x)==PIX_FMT_RGB32_1 \
|| (x)==PIX_FMT_RGB24 \
|| (x)==PIX_FMT_RGB565BE \
|| (x)==PIX_FMT_RGB565LE \
|| (x)==PIX_FMT_RGB555BE \
|| (x)==PIX_FMT_RGB555LE \
|| (x)==PIX_FMT_RGB444BE \
|| (x)==PIX_FMT_RGB444LE \
|| (x)==PIX_FMT_RGB8 \
|| (x)==PIX_FMT_RGB4 \
|| (x)==PIX_FMT_RGB4_BYTE \
|| (x)==PIX_FMT_MONOBLACK \
|| (x)==PIX_FMT_MONOWHITE \
)
#define isBGRinInt(x) ( \
(x)==PIX_FMT_BGR48BE \
|| (x)==PIX_FMT_BGR48LE \
|| (x)==PIX_FMT_BGR32 \
|| (x)==PIX_FMT_BGR32_1 \
|| (x)==PIX_FMT_BGR24 \
|| (x)==PIX_FMT_BGR565BE \
|| (x)==PIX_FMT_BGR565LE \
|| (x)==PIX_FMT_BGR555BE \
|| (x)==PIX_FMT_BGR555LE \
|| (x)==PIX_FMT_BGR444BE \
|| (x)==PIX_FMT_BGR444LE \
|| (x)==PIX_FMT_BGR8 \
|| (x)==PIX_FMT_BGR4 \
|| (x)==PIX_FMT_BGR4_BYTE \
|| (x)==PIX_FMT_MONOBLACK \
|| (x)==PIX_FMT_MONOWHITE \
)
#define isRGBinBytes(x) ( \
(x)==PIX_FMT_RGB48BE \
|| (x)==PIX_FMT_RGB48LE \
|| (x)==PIX_FMT_RGBA \
|| (x)==PIX_FMT_ARGB \
|| (x)==PIX_FMT_RGB24 \
)
#define isBGRinBytes(x) ( \
(x)==PIX_FMT_BGR48BE \
|| (x)==PIX_FMT_BGR48LE \
|| (x)==PIX_FMT_BGRA \
|| (x)==PIX_FMT_ABGR \
|| (x)==PIX_FMT_BGR24 \
)
#define isAnyRGB(x) ( \
isRGBinInt(x) \
|| isBGRinInt(x) \
)
#define isALPHA(x) ( \
(x)==PIX_FMT_BGR32 \
|| (x)==PIX_FMT_BGR32_1 \
|| (x)==PIX_FMT_RGB32 \
|| (x)==PIX_FMT_RGB32_1 \
|| (x)==PIX_FMT_PAL8 \
|| (x)==PIX_FMT_GRAY8A \
|| (x)==PIX_FMT_YUVA420P \
)
#define isPacked(x) ( \
(x)==PIX_FMT_PAL8 \
|| (x)==PIX_FMT_YUYV422 \
|| (x)==PIX_FMT_UYVY422 \
|| (x)==PIX_FMT_Y400A \
|| isAnyRGB(x) \
)
#define usePal(x) ((av_pix_fmt_descriptors[x].flags & PIX_FMT_PAL) || (x) == PIX_FMT_GRAY8A)
extern const uint64_t ff_dither4[2];
extern const uint64_t ff_dither8[2];
extern const uint8_t dithers[8][8][8];
extern const uint16_t dither_scale[15][16];
extern const AVClass sws_context_class;
/**
* Sets c->swScale to an unscaled converter if one exists for the specific
* source and destination formats, bit depths, flags, etc.
*/
void ff_get_unscaled_swscale(SwsContext *c);
void ff_swscale_get_unscaled_altivec(SwsContext *c);
/**
* Returns function pointer to fastest main scaler path function depending
* on architecture and available optimizations.
*/
SwsFunc ff_getSwsFunc(SwsContext *c);
void ff_sws_init_swScale_altivec(SwsContext *c);
void ff_sws_init_swScale_mmx(SwsContext *c);
#endif /* SWSCALE_SWSCALE_INTERNAL_H */