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2d368392a5
This avoids unnecessary churn and build breakage for users, by making sure the whole version.h is included like it has been so far, while keeping the benefit of not needing to rebuild most files in the ffmpeg tree on minor/micro bumps. Signed-off-by: Martin Storsjö <martin@martin.st>
432 lines
15 KiB
C
432 lines
15 KiB
C
/*
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* Copyright (C) 2001-2011 Michael Niedermayer <michaelni@gmx.at>
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg 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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* FFmpeg 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 FFmpeg; 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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* @ingroup libsws
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* external API header
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*/
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#include <stdint.h>
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#include "libavutil/avutil.h"
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#include "libavutil/frame.h"
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#include "libavutil/log.h"
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#include "libavutil/pixfmt.h"
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#include "version_major.h"
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#ifndef HAVE_AV_CONFIG_H
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/* When included as part of the ffmpeg build, only include the major version
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* to avoid unnecessary rebuilds. When included externally, keep including
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* the full version information. */
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#include "version.h"
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#endif
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/**
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* @defgroup libsws libswscale
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* Color conversion and scaling library.
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*
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* @{
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*
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* Return 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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* Return 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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* Return 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 chrominance 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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#define SWS_ERROR_DIFFUSION 0x800000
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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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#define SWS_CS_BT2020 9
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/**
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* Return 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 SwsVector {
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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 SwsFilter {
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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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* Return 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 AVPixelFormat pix_fmt);
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/**
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* Return 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 AVPixelFormat pix_fmt);
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/**
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* @param[in] pix_fmt the pixel format
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* @return a positive value if an endianness conversion for pix_fmt is
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* supported, 0 otherwise.
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*/
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int sws_isSupportedEndiannessConversion(enum AVPixelFormat pix_fmt);
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/**
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* Allocate 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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* Initialize 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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av_warn_unused_result
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int sws_init_context(struct SwsContext *sws_context, SwsFilter *srcFilter, SwsFilter *dstFilter);
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/**
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* Free 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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/**
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* Allocate and return an 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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* @param param extra parameters to tune the used scaler
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* For SWS_BICUBIC param[0] and [1] tune the shape of the basis
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* function, param[0] tunes f(1) and param[1] f´(1)
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* For SWS_GAUSS param[0] tunes the exponent and thus cutoff
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* frequency
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* For SWS_LANCZOS param[0] tunes the width of the window function
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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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*/
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struct SwsContext *sws_getContext(int srcW, int srcH, enum AVPixelFormat srcFormat,
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int dstW, int dstH, enum AVPixelFormat 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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* Scale the image slice in srcSlice and put 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 c 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 *c, const uint8_t *const srcSlice[],
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const int srcStride[], int srcSliceY, int srcSliceH,
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uint8_t *const dst[], const int dstStride[]);
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/**
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* Scale source data from src and write the output to dst.
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*
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* This is merely a convenience wrapper around
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* - sws_frame_start()
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* - sws_send_slice(0, src->height)
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* - sws_receive_slice(0, dst->height)
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* - sws_frame_end()
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*
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* @param dst The destination frame. See documentation for sws_frame_start() for
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* more details.
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* @param src The source frame.
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*
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* @return 0 on success, a negative AVERROR code on failure
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*/
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int sws_scale_frame(struct SwsContext *c, AVFrame *dst, const AVFrame *src);
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/**
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* Initialize the scaling process for a given pair of source/destination frames.
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* Must be called before any calls to sws_send_slice() and sws_receive_slice().
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*
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* This function will retain references to src and dst, so they must both use
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* refcounted buffers (if allocated by the caller, in case of dst).
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*
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* @param dst The destination frame.
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*
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* The data buffers may either be already allocated by the caller or
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* left clear, in which case they will be allocated by the scaler.
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* The latter may have performance advantages - e.g. in certain cases
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* some output planes may be references to input planes, rather than
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* copies.
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*
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* Output data will be written into this frame in successful
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* sws_receive_slice() calls.
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* @param src The source frame. The data buffers must be allocated, but the
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* frame data does not have to be ready at this point. Data
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* availability is then signalled by sws_send_slice().
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* @return 0 on success, a negative AVERROR code on failure
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*
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* @see sws_frame_end()
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*/
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int sws_frame_start(struct SwsContext *c, AVFrame *dst, const AVFrame *src);
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/**
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* Finish the scaling process for a pair of source/destination frames previously
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* submitted with sws_frame_start(). Must be called after all sws_send_slice()
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* and sws_receive_slice() calls are done, before any new sws_frame_start()
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* calls.
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*/
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void sws_frame_end(struct SwsContext *c);
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/**
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* Indicate that a horizontal slice of input data is available in the source
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* frame previously provided to sws_frame_start(). The slices may be provided in
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* any order, but may not overlap. For vertically subsampled pixel formats, the
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* slices must be aligned according to subsampling.
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*
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* @param slice_start first row of the slice
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* @param slice_height number of rows in the slice
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*
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* @return a non-negative number on success, a negative AVERROR code on failure.
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*/
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int sws_send_slice(struct SwsContext *c, unsigned int slice_start,
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unsigned int slice_height);
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/**
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* Request a horizontal slice of the output data to be written into the frame
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* previously provided to sws_frame_start().
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*
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* @param slice_start first row of the slice; must be a multiple of
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* sws_receive_slice_alignment()
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* @param slice_height number of rows in the slice; must be a multiple of
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* sws_receive_slice_alignment(), except for the last slice
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* (i.e. when slice_start+slice_height is equal to output
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* frame height)
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*
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* @return a non-negative number if the data was successfully written into the output
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* AVERROR(EAGAIN) if more input data needs to be provided before the
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* output can be produced
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* another negative AVERROR code on other kinds of scaling failure
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*/
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int sws_receive_slice(struct SwsContext *c, unsigned int slice_start,
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unsigned int slice_height);
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/**
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* @return alignment required for output slices requested with sws_receive_slice().
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* Slice offsets and sizes passed to sws_receive_slice() must be
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* multiples of the value returned from this function.
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*/
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unsigned int sws_receive_slice_alignment(const struct SwsContext *c);
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/**
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* @param dstRange flag indicating the while-black range of the output (1=jpeg / 0=mpeg)
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* @param srcRange flag indicating the while-black range of the input (1=jpeg / 0=mpeg)
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* @param table the yuv2rgb coefficients describing the output yuv space, normally ff_yuv2rgb_coeffs[x]
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* @param inv_table the yuv2rgb coefficients describing the input yuv space, normally ff_yuv2rgb_coeffs[x]
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* @param brightness 16.16 fixed point brightness correction
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* @param contrast 16.16 fixed point contrast correction
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* @param saturation 16.16 fixed point saturation correction
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#if LIBSWSCALE_VERSION_MAJOR > 6
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* @return negative error code on error, non negative otherwise
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#else
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* @return -1 if not supported
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#endif
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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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#if LIBSWSCALE_VERSION_MAJOR > 6
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* @return negative error code on error, non negative otherwise
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#else
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* @return -1 if not supported
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#endif
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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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* Allocate and return 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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* Return 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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* Scale 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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* Scale 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_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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* Check if context can be reused, otherwise reallocate a new 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 AVPixelFormat srcFormat,
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int dstW, int dstH, enum AVPixelFormat 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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* Convert an 8-bit 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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* Convert an 8-bit 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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/**
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* Get the AVClass for swsContext. It can be used in combination with
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* AV_OPT_SEARCH_FAKE_OBJ for examining options.
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*
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* @see av_opt_find().
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*/
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const AVClass *sws_get_class(void);
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/**
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* @}
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*/
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#endif /* SWSCALE_SWSCALE_H */
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