libswscale/swscale.h - third_party/ffmpeg - Git at Google

 /*
  * Copyright (C) 2001-2011 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_H
 #define SWSCALE_SWSCALE_H

 /**
  * @file
  * @ingroup libsws
  * external API header
  */

 #include <stdint.h>

 #include "libavutil/avutil.h"
 #include "libavutil/log.h"
 #include "libavutil/pixfmt.h"
 #include "version.h"

 /**
  * @defgroup libsws libswscale
  * Color conversion and scaling library.
  *
  * @{
  *
  * Return the LIBSWSCALE_VERSION_INT constant.
  */
 unsigned swscale_version(void);

 /**
  * Return the libswscale build-time configuration.
  */
 const char *swscale_configuration(void);

 /**
  * Return the libswscale license.
  */
 const char *swscale_license(void);

 /* values for the flags, the stuff on the command line is different */
 #define SWS_FAST_BILINEAR     1
 #define SWS_BILINEAR          2
 #define SWS_BICUBIC           4
 #define SWS_X                 8
 #define SWS_POINT          0x10
 #define SWS_AREA           0x20
 #define SWS_BICUBLIN       0x40
 #define SWS_GAUSS          0x80
 #define SWS_SINC          0x100
 #define SWS_LANCZOS       0x200
 #define SWS_SPLINE        0x400

 #define SWS_SRC_V_CHR_DROP_MASK     0x30000
 #define SWS_SRC_V_CHR_DROP_SHIFT    16

 #define SWS_PARAM_DEFAULT           123456

 #define SWS_PRINT_INFO              0x1000

 //the following 3 flags are not completely implemented
 //internal chrominance subsampling info
 #define SWS_FULL_CHR_H_INT    0x2000
 //input subsampling info
 #define SWS_FULL_CHR_H_INP    0x4000
 #define SWS_DIRECT_BGR        0x8000
 #define SWS_ACCURATE_RND      0x40000
 #define SWS_BITEXACT          0x80000
 #define SWS_ERROR_DIFFUSION  0x800000

 #define SWS_MAX_REDUCE_CUTOFF 0.002

 #define SWS_CS_ITU709         1
 #define SWS_CS_FCC            4
 #define SWS_CS_ITU601         5
 #define SWS_CS_ITU624         5
 #define SWS_CS_SMPTE170M      5
 #define SWS_CS_SMPTE240M      7
 #define SWS_CS_DEFAULT        5
 #define SWS_CS_BT2020         9

 /**
  * Return a pointer to yuv<->rgb coefficients for the given colorspace
  * suitable for sws_setColorspaceDetails().
  *
  * @param colorspace One of the SWS_CS_* macros. If invalid,
  * SWS_CS_DEFAULT is used.
  */
 const int *sws_getCoefficients(int colorspace);

 // when used for filters they must have an odd number of elements
 // coeffs cannot be shared between vectors
 typedef struct SwsVector {
     double *coeff;              ///< pointer to the list of coefficients
     int length;                 ///< number of coefficients in the vector
 } SwsVector;

 // vectors can be shared
 typedef struct SwsFilter {
     SwsVector *lumH;
     SwsVector *lumV;
     SwsVector *chrH;
     SwsVector *chrV;
 } SwsFilter;

 struct SwsContext;

 /**
  * Return a positive value if pix_fmt is a supported input format, 0
  * otherwise.
  */
 int sws_isSupportedInput(enum AVPixelFormat pix_fmt);

 /**
  * Return a positive value if pix_fmt is a supported output format, 0
  * otherwise.
  */
 int sws_isSupportedOutput(enum AVPixelFormat pix_fmt);

 /**
  * @param[in]  pix_fmt the pixel format
  * @return a positive value if an endianness conversion for pix_fmt is
  * supported, 0 otherwise.
  */
 int sws_isSupportedEndiannessConversion(enum AVPixelFormat pix_fmt);

 /**
  * Allocate an empty SwsContext. This must be filled and passed to
  * sws_init_context(). For filling see AVOptions, options.c and
  * sws_setColorspaceDetails().
  */
 struct SwsContext *sws_alloc_context(void);

 /**
  * Initialize the swscaler context sws_context.
  *
  * @return zero or positive value on success, a negative value on
  * error
  */
 av_warn_unused_result
 int sws_init_context(struct SwsContext *sws_context, SwsFilter *srcFilter, SwsFilter *dstFilter);

 /**
  * Free the swscaler context swsContext.
  * If swsContext is NULL, then does nothing.
  */
 void sws_freeContext(struct SwsContext *swsContext);

 /**
  * Allocate and return an SwsContext. You need it to perform
  * scaling/conversion operations using sws_scale().
  *
  * @param srcW the width of the source image
  * @param srcH the height of the source image
  * @param srcFormat the source image format
  * @param dstW the width of the destination image
  * @param dstH the height of the destination image
  * @param dstFormat the destination image format
  * @param flags specify which algorithm and options to use for rescaling
  * @param param extra parameters to tune the used scaler
  *              For SWS_BICUBIC param[0] and [1] tune the shape of the basis
  *              function, param[0] tunes f(1) and param[1] f´(1)
  *              For SWS_GAUSS param[0] tunes the exponent and thus cutoff
  *              frequency
  *              For SWS_LANCZOS param[0] tunes the width of the window function
  * @return a pointer to an allocated context, or NULL in case of error
  * @note this function is to be removed after a saner alternative is
  *       written
  */
 struct 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);

 /**
  * Scale the image slice in srcSlice and put the resulting scaled
  * slice in the image in dst. A slice is a sequence of consecutive
  * rows in an image.
  *
  * Slices have to be provided in sequential order, either in
  * top-bottom or bottom-top order. If slices are provided in
  * non-sequential order the behavior of the function is undefined.
  *
  * @param c         the scaling context previously created with
  *                  sws_getContext()
  * @param srcSlice  the array containing the pointers to the planes of
  *                  the source slice
  * @param srcStride the array containing the strides for each plane of
  *                  the source image
  * @param srcSliceY the position in the source image of the slice to
  *                  process, that is the number (counted starting from
  *                  zero) in the image of the first row of the slice
  * @param srcSliceH the height of the source slice, that is the number
  *                  of rows in the slice
  * @param dst       the array containing the pointers to the planes of
  *                  the destination image
  * @param dstStride the array containing the strides for each plane of
  *                  the destination image
  * @return          the height of the output slice
  */
 int sws_scale(struct SwsContext *c, const uint8_t *const srcSlice[],
               const int srcStride[], int srcSliceY, int srcSliceH,
               uint8_t *const dst[], const int dstStride[]);

 /**
  * @param dstRange flag indicating the while-black range of the output (1=jpeg / 0=mpeg)
  * @param srcRange flag indicating the while-black range of the input (1=jpeg / 0=mpeg)
  * @param table the yuv2rgb coefficients describing the output yuv space, normally ff_yuv2rgb_coeffs[x]
  * @param inv_table the yuv2rgb coefficients describing the input yuv space, normally ff_yuv2rgb_coeffs[x]
  * @param brightness 16.16 fixed point brightness correction
  * @param contrast 16.16 fixed point contrast correction
  * @param saturation 16.16 fixed point saturation correction
  * @return -1 if not supported
  */
 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);

 /**
  * @return -1 if not supported
  */
 int sws_getColorspaceDetails(struct SwsContext *c, int **inv_table,
                              int *srcRange, int **table, int *dstRange,
                              int *brightness, int *contrast, int *saturation);

 /**
  * Allocate and return an uninitialized vector with length coefficients.
  */
 SwsVector *sws_allocVec(int length);

 /**
  * Return a normalized Gaussian curve used to filter stuff
  * quality = 3 is high quality, lower is lower quality.
  */
 SwsVector *sws_getGaussianVec(double variance, double quality);

 /**
  * Scale all the coefficients of a by the scalar value.
  */
 void sws_scaleVec(SwsVector *a, double scalar);

 /**
  * Scale all the coefficients of a so that their sum equals height.
  */
 void sws_normalizeVec(SwsVector *a, double height);

 #if FF_API_SWS_VECTOR
 attribute_deprecated SwsVector *sws_getConstVec(double c, int length);
 attribute_deprecated SwsVector *sws_getIdentityVec(void);
 attribute_deprecated void sws_convVec(SwsVector *a, SwsVector *b);
 attribute_deprecated void sws_addVec(SwsVector *a, SwsVector *b);
 attribute_deprecated void sws_subVec(SwsVector *a, SwsVector *b);
 attribute_deprecated void sws_shiftVec(SwsVector *a, int shift);
 attribute_deprecated SwsVector *sws_cloneVec(SwsVector *a);
 attribute_deprecated void sws_printVec2(SwsVector *a, AVClass *log_ctx, int log_level);
 #endif

 void sws_freeVec(SwsVector *a);

 SwsFilter *sws_getDefaultFilter(float lumaGBlur, float chromaGBlur,
                                 float lumaSharpen, float chromaSharpen,
                                 float chromaHShift, float chromaVShift,
                                 int verbose);
 void sws_freeFilter(SwsFilter *filter);

 /**
  * Check if context can be reused, otherwise reallocate a new one.
  *
  * If context is NULL, just calls sws_getContext() to get a new
  * context. Otherwise, checks if the parameters are the ones already
  * saved in context. If that is the case, returns the current
  * context. Otherwise, frees context and gets a new context with
  * the new parameters.
  *
  * Be warned that srcFilter and dstFilter are not checked, they
  * are assumed to remain the same.
  */
 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);

 /**
  * Convert an 8-bit paletted frame into a frame with a color depth of 32 bits.
  *
  * The output frame will have the same packed format as the palette.
  *
  * @param src        source frame buffer
  * @param dst        destination frame buffer
  * @param num_pixels number of pixels to convert
  * @param palette    array with [256] entries, which must match color arrangement (RGB or BGR) of src
  */
 void sws_convertPalette8ToPacked32(const uint8_t *src, uint8_t *dst, int num_pixels, const uint8_t *palette);

 /**
  * Convert an 8-bit paletted frame into a frame with a color depth of 24 bits.
  *
  * With the palette format "ABCD", the destination frame ends up with the format "ABC".
  *
  * @param src        source frame buffer
  * @param dst        destination frame buffer
  * @param num_pixels number of pixels to convert
  * @param palette    array with [256] entries, which must match color arrangement (RGB or BGR) of src
  */
 void sws_convertPalette8ToPacked24(const uint8_t *src, uint8_t *dst, int num_pixels, const uint8_t *palette);

 /**
  * Get the AVClass for swsContext. It can be used in combination with
  * AV_OPT_SEARCH_FAKE_OBJ for examining options.
  *
  * @see av_opt_find().
  */
 const AVClass *sws_get_class(void);

 /**
  * @}
  */

 #endif /* SWSCALE_SWSCALE_H */
	/*
	* Copyright (C) 2001-2011 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_H
	#define SWSCALE_SWSCALE_H

	/**
	* @file
	* @ingroup libsws
	* external API header
	*/

	#include <stdint.h>

	#include "libavutil/avutil.h"
	#include "libavutil/log.h"
	#include "libavutil/pixfmt.h"
	#include "version.h"

	/**
	* @defgroup libsws libswscale
	* Color conversion and scaling library.
	*
	* @{
	*
	* Return the LIBSWSCALE_VERSION_INT constant.
	*/
	unsigned swscale_version(void);

	/**
	* Return the libswscale build-time configuration.
	*/
	const char *swscale_configuration(void);

	/**
	* Return the libswscale license.
	*/
	const char *swscale_license(void);

	/* values for the flags, the stuff on the command line is different */
	#define SWS_FAST_BILINEAR 1
	#define SWS_BILINEAR 2
	#define SWS_BICUBIC 4
	#define SWS_X 8
	#define SWS_POINT 0x10
	#define SWS_AREA 0x20
	#define SWS_BICUBLIN 0x40
	#define SWS_GAUSS 0x80
	#define SWS_SINC 0x100
	#define SWS_LANCZOS 0x200
	#define SWS_SPLINE 0x400

	#define SWS_SRC_V_CHR_DROP_MASK 0x30000
	#define SWS_SRC_V_CHR_DROP_SHIFT 16

	#define SWS_PARAM_DEFAULT 123456

	#define SWS_PRINT_INFO 0x1000

	//the following 3 flags are not completely implemented
	//internal chrominance subsampling info
	#define SWS_FULL_CHR_H_INT 0x2000
	//input subsampling info
	#define SWS_FULL_CHR_H_INP 0x4000
	#define SWS_DIRECT_BGR 0x8000
	#define SWS_ACCURATE_RND 0x40000
	#define SWS_BITEXACT 0x80000
	#define SWS_ERROR_DIFFUSION 0x800000

	#define SWS_MAX_REDUCE_CUTOFF 0.002

	#define SWS_CS_ITU709 1
	#define SWS_CS_FCC 4
	#define SWS_CS_ITU601 5
	#define SWS_CS_ITU624 5
	#define SWS_CS_SMPTE170M 5
	#define SWS_CS_SMPTE240M 7
	#define SWS_CS_DEFAULT 5
	#define SWS_CS_BT2020 9

	/**
	* Return a pointer to yuv<->rgb coefficients for the given colorspace
	* suitable for sws_setColorspaceDetails().
	*
	* @param colorspace One of the SWS_CS_* macros. If invalid,
	* SWS_CS_DEFAULT is used.
	*/
	const int *sws_getCoefficients(int colorspace);

	// when used for filters they must have an odd number of elements
	// coeffs cannot be shared between vectors
	typedef struct SwsVector {
	double *coeff; ///< pointer to the list of coefficients
	int length; ///< number of coefficients in the vector
	} SwsVector;

	// vectors can be shared
	typedef struct SwsFilter {
	SwsVector *lumH;
	SwsVector *lumV;
	SwsVector *chrH;
	SwsVector *chrV;
	} SwsFilter;

	struct SwsContext;

	/**
	* Return a positive value if pix_fmt is a supported input format, 0
	* otherwise.
	*/
	int sws_isSupportedInput(enum AVPixelFormat pix_fmt);

	/**
	* Return a positive value if pix_fmt is a supported output format, 0
	* otherwise.
	*/
	int sws_isSupportedOutput(enum AVPixelFormat pix_fmt);

	/**
	* @param[in] pix_fmt the pixel format
	* @return a positive value if an endianness conversion for pix_fmt is
	* supported, 0 otherwise.
	*/
	int sws_isSupportedEndiannessConversion(enum AVPixelFormat pix_fmt);

	/**
	* Allocate an empty SwsContext. This must be filled and passed to
	* sws_init_context(). For filling see AVOptions, options.c and
	* sws_setColorspaceDetails().
	*/
	struct SwsContext *sws_alloc_context(void);

	/**
	* Initialize the swscaler context sws_context.
	*
	* @return zero or positive value on success, a negative value on
	* error
	*/
	av_warn_unused_result
	int sws_init_context(struct SwsContext sws_context, SwsFilter srcFilter, SwsFilter *dstFilter);

	/**
	* Free the swscaler context swsContext.
	* If swsContext is NULL, then does nothing.
	*/
	void sws_freeContext(struct SwsContext *swsContext);

	/**
	* Allocate and return an SwsContext. You need it to perform
	* scaling/conversion operations using sws_scale().
	*
	* @param srcW the width of the source image
	* @param srcH the height of the source image
	* @param srcFormat the source image format
	* @param dstW the width of the destination image
	* @param dstH the height of the destination image
	* @param dstFormat the destination image format
	* @param flags specify which algorithm and options to use for rescaling
	* @param param extra parameters to tune the used scaler
	* For SWS_BICUBIC param[0] and [1] tune the shape of the basis
	* function, param[0] tunes f(1) and param[1] f´(1)
	* For SWS_GAUSS param[0] tunes the exponent and thus cutoff
	* frequency
	* For SWS_LANCZOS param[0] tunes the width of the window function
	* @return a pointer to an allocated context, or NULL in case of error
	* @note this function is to be removed after a saner alternative is
	* written
	*/
	struct 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);

	/**
	* Scale the image slice in srcSlice and put the resulting scaled
	* slice in the image in dst. A slice is a sequence of consecutive
	* rows in an image.
	*
	* Slices have to be provided in sequential order, either in
	* top-bottom or bottom-top order. If slices are provided in
	* non-sequential order the behavior of the function is undefined.
	*
	* @param c the scaling context previously created with
	* sws_getContext()
	* @param srcSlice the array containing the pointers to the planes of
	* the source slice
	* @param srcStride the array containing the strides for each plane of
	* the source image
	* @param srcSliceY the position in the source image of the slice to
	* process, that is the number (counted starting from
	* zero) in the image of the first row of the slice
	* @param srcSliceH the height of the source slice, that is the number
	* of rows in the slice
	* @param dst the array containing the pointers to the planes of
	* the destination image
	* @param dstStride the array containing the strides for each plane of
	* the destination image
	* @return the height of the output slice
	*/
	int sws_scale(struct SwsContext c, const uint8_t const srcSlice[],
	const int srcStride[], int srcSliceY, int srcSliceH,
	uint8_t *const dst[], const int dstStride[]);

	/**
	* @param dstRange flag indicating the while-black range of the output (1=jpeg / 0=mpeg)
	* @param srcRange flag indicating the while-black range of the input (1=jpeg / 0=mpeg)
	* @param table the yuv2rgb coefficients describing the output yuv space, normally ff_yuv2rgb_coeffs[x]
	* @param inv_table the yuv2rgb coefficients describing the input yuv space, normally ff_yuv2rgb_coeffs[x]
	* @param brightness 16.16 fixed point brightness correction
	* @param contrast 16.16 fixed point contrast correction
	* @param saturation 16.16 fixed point saturation correction
	* @return -1 if not supported
	*/
	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);

	/**
	* @return -1 if not supported
	*/
	int sws_getColorspaceDetails(struct SwsContext c, int *inv_table,
	int srcRange, int table, int dstRange,
	int brightness, int contrast, int *saturation);

	/**
	* Allocate and return an uninitialized vector with length coefficients.
	*/
	SwsVector *sws_allocVec(int length);

	/**
	* Return a normalized Gaussian curve used to filter stuff
	* quality = 3 is high quality, lower is lower quality.
	*/
	SwsVector *sws_getGaussianVec(double variance, double quality);

	/**
	* Scale all the coefficients of a by the scalar value.
	*/
	void sws_scaleVec(SwsVector *a, double scalar);

	/**
	* Scale all the coefficients of a so that their sum equals height.
	*/
	void sws_normalizeVec(SwsVector *a, double height);

	#if FF_API_SWS_VECTOR
	attribute_deprecated SwsVector *sws_getConstVec(double c, int length);
	attribute_deprecated SwsVector *sws_getIdentityVec(void);
	attribute_deprecated void sws_convVec(SwsVector a, SwsVector b);
	attribute_deprecated void sws_addVec(SwsVector a, SwsVector b);
	attribute_deprecated void sws_subVec(SwsVector a, SwsVector b);
	attribute_deprecated void sws_shiftVec(SwsVector *a, int shift);
	attribute_deprecated SwsVector sws_cloneVec(SwsVector a);
	attribute_deprecated void sws_printVec2(SwsVector a, AVClass log_ctx, int log_level);
	#endif

	void sws_freeVec(SwsVector *a);

	SwsFilter *sws_getDefaultFilter(float lumaGBlur, float chromaGBlur,
	float lumaSharpen, float chromaSharpen,
	float chromaHShift, float chromaVShift,
	int verbose);
	void sws_freeFilter(SwsFilter *filter);

	/**
	* Check if context can be reused, otherwise reallocate a new one.
	*
	* If context is NULL, just calls sws_getContext() to get a new
	* context. Otherwise, checks if the parameters are the ones already
	* saved in context. If that is the case, returns the current
	* context. Otherwise, frees context and gets a new context with
	* the new parameters.
	*
	* Be warned that srcFilter and dstFilter are not checked, they
	* are assumed to remain the same.
	*/
	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);

	/**
	* Convert an 8-bit paletted frame into a frame with a color depth of 32 bits.
	*
	* The output frame will have the same packed format as the palette.
	*
	* @param src source frame buffer
	* @param dst destination frame buffer
	* @param num_pixels number of pixels to convert
	* @param palette array with [256] entries, which must match color arrangement (RGB or BGR) of src
	*/
	void sws_convertPalette8ToPacked32(const uint8_t src, uint8_t dst, int num_pixels, const uint8_t *palette);

	/**
	* Convert an 8-bit paletted frame into a frame with a color depth of 24 bits.
	*
	* With the palette format "ABCD", the destination frame ends up with the format "ABC".
	*
	* @param src source frame buffer
	* @param dst destination frame buffer
	* @param num_pixels number of pixels to convert
	* @param palette array with [256] entries, which must match color arrangement (RGB or BGR) of src
	*/
	void sws_convertPalette8ToPacked24(const uint8_t src, uint8_t dst, int num_pixels, const uint8_t *palette);

	/**
	* Get the AVClass for swsContext. It can be used in combination with
	* AV_OPT_SEARCH_FAKE_OBJ for examining options.
	*
	* @see av_opt_find().
	*/
	const AVClass *sws_get_class(void);

	/**
	* @}
	*/

	#endif /* SWSCALE_SWSCALE_H */