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0793531859
On architectures such as x86 (both 32 bit and 64bit), the stack element size is fixed, which maintains alignment. Here, this change does not break anything. However, we also support also other architectures where this property is not maintained and therefore, applications will crash horribly. This change effectively forces all applications to be recompiled against libswscale.
354 lines
12 KiB
C
354 lines
12 KiB
C
/*
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* Copyright (C) 2001-2003 Michael Niedermayer <michaelni@gmx.at>
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*
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* This file is part of Libav.
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*
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* Libav is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* Libav is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with Libav; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#ifndef SWSCALE_SWSCALE_H
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#define SWSCALE_SWSCALE_H
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/**
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* @file
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* @brief
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* external api for the swscale stuff
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*/
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#include "libavutil/avutil.h"
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#define LIBSWSCALE_VERSION_MAJOR 2
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#define LIBSWSCALE_VERSION_MINOR 0
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#define LIBSWSCALE_VERSION_MICRO 0
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#define LIBSWSCALE_VERSION_INT AV_VERSION_INT(LIBSWSCALE_VERSION_MAJOR, \
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LIBSWSCALE_VERSION_MINOR, \
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LIBSWSCALE_VERSION_MICRO)
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#define LIBSWSCALE_VERSION AV_VERSION(LIBSWSCALE_VERSION_MAJOR, \
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LIBSWSCALE_VERSION_MINOR, \
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LIBSWSCALE_VERSION_MICRO)
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#define LIBSWSCALE_BUILD LIBSWSCALE_VERSION_INT
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#define LIBSWSCALE_IDENT "SwS" AV_STRINGIFY(LIBSWSCALE_VERSION)
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/**
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* Those FF_API_* defines are not part of public API.
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* They may change, break or disappear at any time.
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*/
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#ifndef FF_API_SWS_GETCONTEXT
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#define FF_API_SWS_GETCONTEXT (LIBSWSCALE_VERSION_MAJOR < 3)
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#endif
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#ifndef FF_API_SWS_CPU_CAPS
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#define FF_API_SWS_CPU_CAPS (LIBSWSCALE_VERSION_MAJOR < 3)
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#endif
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/**
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* Returns the LIBSWSCALE_VERSION_INT constant.
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*/
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unsigned swscale_version(void);
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/**
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* Returns the libswscale build-time configuration.
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*/
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const char *swscale_configuration(void);
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/**
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* Returns the libswscale license.
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*/
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const char *swscale_license(void);
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/* values for the flags, the stuff on the command line is different */
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#define SWS_FAST_BILINEAR 1
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#define SWS_BILINEAR 2
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#define SWS_BICUBIC 4
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#define SWS_X 8
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#define SWS_POINT 0x10
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#define SWS_AREA 0x20
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#define SWS_BICUBLIN 0x40
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#define SWS_GAUSS 0x80
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#define SWS_SINC 0x100
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#define SWS_LANCZOS 0x200
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#define SWS_SPLINE 0x400
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#define SWS_SRC_V_CHR_DROP_MASK 0x30000
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#define SWS_SRC_V_CHR_DROP_SHIFT 16
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#define SWS_PARAM_DEFAULT 123456
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#define SWS_PRINT_INFO 0x1000
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//the following 3 flags are not completely implemented
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//internal chrominace subsampling info
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#define SWS_FULL_CHR_H_INT 0x2000
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//input subsampling info
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#define SWS_FULL_CHR_H_INP 0x4000
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#define SWS_DIRECT_BGR 0x8000
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#define SWS_ACCURATE_RND 0x40000
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#define SWS_BITEXACT 0x80000
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#if FF_API_SWS_CPU_CAPS
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/**
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* CPU caps are autodetected now, those flags
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* are only provided for API compatibility.
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*/
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#define SWS_CPU_CAPS_MMX 0x80000000
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#define SWS_CPU_CAPS_MMX2 0x20000000
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#define SWS_CPU_CAPS_3DNOW 0x40000000
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#define SWS_CPU_CAPS_ALTIVEC 0x10000000
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#define SWS_CPU_CAPS_BFIN 0x01000000
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#define SWS_CPU_CAPS_SSE2 0x02000000
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#endif
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#define SWS_MAX_REDUCE_CUTOFF 0.002
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#define SWS_CS_ITU709 1
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#define SWS_CS_FCC 4
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#define SWS_CS_ITU601 5
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#define SWS_CS_ITU624 5
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#define SWS_CS_SMPTE170M 5
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#define SWS_CS_SMPTE240M 7
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#define SWS_CS_DEFAULT 5
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/**
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* Returns a pointer to yuv<->rgb coefficients for the given colorspace
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* suitable for sws_setColorspaceDetails().
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*
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* @param colorspace One of the SWS_CS_* macros. If invalid,
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* SWS_CS_DEFAULT is used.
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*/
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const int *sws_getCoefficients(int colorspace);
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// when used for filters they must have an odd number of elements
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// coeffs cannot be shared between vectors
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typedef struct {
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double *coeff; ///< pointer to the list of coefficients
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int length; ///< number of coefficients in the vector
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} SwsVector;
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// vectors can be shared
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typedef struct {
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SwsVector *lumH;
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SwsVector *lumV;
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SwsVector *chrH;
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SwsVector *chrV;
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} SwsFilter;
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struct SwsContext;
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/**
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* Returns a positive value if pix_fmt is a supported input format, 0
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* otherwise.
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*/
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int sws_isSupportedInput(enum PixelFormat pix_fmt);
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/**
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* Returns a positive value if pix_fmt is a supported output format, 0
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* otherwise.
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*/
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int sws_isSupportedOutput(enum PixelFormat pix_fmt);
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/**
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* Allocates an empty SwsContext. This must be filled and passed to
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* sws_init_context(). For filling see AVOptions, options.c and
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* sws_setColorspaceDetails().
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*/
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struct SwsContext *sws_alloc_context(void);
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/**
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* Initializes the swscaler context sws_context.
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*
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* @return zero or positive value on success, a negative value on
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* error
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*/
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int sws_init_context(struct SwsContext *sws_context, SwsFilter *srcFilter, SwsFilter *dstFilter);
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/**
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* Frees the swscaler context swsContext.
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* If swsContext is NULL, then does nothing.
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*/
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void sws_freeContext(struct SwsContext *swsContext);
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#if FF_API_SWS_GETCONTEXT
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/**
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* Allocates and returns a SwsContext. You need it to perform
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* scaling/conversion operations using sws_scale().
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*
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* @param srcW the width of the source image
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* @param srcH the height of the source image
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* @param srcFormat the source image format
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* @param dstW the width of the destination image
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* @param dstH the height of the destination image
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* @param dstFormat the destination image format
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* @param flags specify which algorithm and options to use for rescaling
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* @return a pointer to an allocated context, or NULL in case of error
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* @note this function is to be removed after a saner alternative is
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* written
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* @deprecated Use sws_getCachedContext() instead.
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*/
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struct SwsContext *sws_getContext(int srcW, int srcH, enum PixelFormat srcFormat,
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int dstW, int dstH, enum PixelFormat dstFormat,
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int flags, SwsFilter *srcFilter,
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SwsFilter *dstFilter, const double *param);
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#endif
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/**
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* Scales the image slice in srcSlice and puts the resulting scaled
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* slice in the image in dst. A slice is a sequence of consecutive
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* rows in an image.
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*
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* Slices have to be provided in sequential order, either in
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* top-bottom or bottom-top order. If slices are provided in
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* non-sequential order the behavior of the function is undefined.
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*
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* @param context the scaling context previously created with
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* sws_getContext()
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* @param srcSlice the array containing the pointers to the planes of
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* the source slice
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* @param srcStride the array containing the strides for each plane of
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* the source image
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* @param srcSliceY the position in the source image of the slice to
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* process, that is the number (counted starting from
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* zero) in the image of the first row of the slice
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* @param srcSliceH the height of the source slice, that is the number
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* of rows in the slice
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* @param dst the array containing the pointers to the planes of
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* the destination image
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* @param dstStride the array containing the strides for each plane of
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* the destination image
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* @return the height of the output slice
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*/
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int sws_scale(struct SwsContext *context, const uint8_t* const srcSlice[], const int srcStride[],
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int srcSliceY, int srcSliceH, uint8_t* const dst[], const int dstStride[]);
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/**
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* @param inv_table the yuv2rgb coefficients, normally ff_yuv2rgb_coeffs[x]
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* @param fullRange if 1 then the luma range is 0..255 if 0 it is 16..235
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* @return -1 if not supported
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*/
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int sws_setColorspaceDetails(struct SwsContext *c, const int inv_table[4],
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int srcRange, const int table[4], int dstRange,
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int brightness, int contrast, int saturation);
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/**
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* @return -1 if not supported
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*/
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int sws_getColorspaceDetails(struct SwsContext *c, int **inv_table,
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int *srcRange, int **table, int *dstRange,
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int *brightness, int *contrast, int *saturation);
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/**
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* Allocates and returns an uninitialized vector with length coefficients.
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*/
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SwsVector *sws_allocVec(int length);
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/**
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* Returns a normalized Gaussian curve used to filter stuff
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* quality=3 is high quality, lower is lower quality.
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*/
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SwsVector *sws_getGaussianVec(double variance, double quality);
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/**
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* Allocates and returns a vector with length coefficients, all
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* with the same value c.
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*/
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SwsVector *sws_getConstVec(double c, int length);
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/**
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* Allocates and returns a vector with just one coefficient, with
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* value 1.0.
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*/
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SwsVector *sws_getIdentityVec(void);
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/**
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* Scales all the coefficients of a by the scalar value.
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*/
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void sws_scaleVec(SwsVector *a, double scalar);
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/**
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* Scales all the coefficients of a so that their sum equals height.
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*/
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void sws_normalizeVec(SwsVector *a, double height);
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void sws_convVec(SwsVector *a, SwsVector *b);
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void sws_addVec(SwsVector *a, SwsVector *b);
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void sws_subVec(SwsVector *a, SwsVector *b);
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void sws_shiftVec(SwsVector *a, int shift);
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/**
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* Allocates and returns a clone of the vector a, that is a vector
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* with the same coefficients as a.
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*/
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SwsVector *sws_cloneVec(SwsVector *a);
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/**
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* Prints with av_log() a textual representation of the vector a
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* if log_level <= av_log_level.
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*/
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void sws_printVec2(SwsVector *a, AVClass *log_ctx, int log_level);
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void sws_freeVec(SwsVector *a);
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SwsFilter *sws_getDefaultFilter(float lumaGBlur, float chromaGBlur,
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float lumaSharpen, float chromaSharpen,
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float chromaHShift, float chromaVShift,
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int verbose);
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void sws_freeFilter(SwsFilter *filter);
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/**
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* Checks if context can be reused, otherwise reallocates a new
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* one.
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*
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* If context is NULL, just calls sws_getContext() to get a new
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* context. Otherwise, checks if the parameters are the ones already
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* saved in context. If that is the case, returns the current
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* context. Otherwise, frees context and gets a new context with
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* the new parameters.
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*
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* Be warned that srcFilter and dstFilter are not checked, they
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* are assumed to remain the same.
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*/
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struct SwsContext *sws_getCachedContext(struct SwsContext *context,
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int srcW, int srcH, enum PixelFormat srcFormat,
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int dstW, int dstH, enum PixelFormat dstFormat,
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int flags, SwsFilter *srcFilter,
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SwsFilter *dstFilter, const double *param);
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/**
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* Converts an 8bit paletted frame into a frame with a color depth of 32-bits.
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*
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* The output frame will have the same packed format as the palette.
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*
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* @param src source frame buffer
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* @param dst destination frame buffer
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* @param num_pixels number of pixels to convert
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* @param palette array with [256] entries, which must match color arrangement (RGB or BGR) of src
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*/
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void sws_convertPalette8ToPacked32(const uint8_t *src, uint8_t *dst, int num_pixels, const uint8_t *palette);
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/**
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* Converts an 8bit paletted frame into a frame with a color depth of 24 bits.
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*
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* With the palette format "ABCD", the destination frame ends up with the format "ABC".
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*
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* @param src source frame buffer
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* @param dst destination frame buffer
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* @param num_pixels number of pixels to convert
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* @param palette array with [256] entries, which must match color arrangement (RGB or BGR) of src
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*/
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void sws_convertPalette8ToPacked24(const uint8_t *src, uint8_t *dst, int num_pixels, const uint8_t *palette);
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#endif /* SWSCALE_SWSCALE_H */
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