--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/lib/libswscale/swscale.h	Tue Dec 31 14:52:14 2013 +0000
@@ -0,0 +1,362 @@
+/*
+ * 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 lsws
+ * external API header
+ */
+
+/**
+ * @defgroup lsws Libswscale
+ * @{
+ */
+
+#include <stdint.h>
+
+#include "../libavutil/avutil.h"
+#include "../libavutil/log.h"
+#include "../libavutil/pixfmt.h"
+#include "version.h"
+
+/**
+ * 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 chrominace 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
+
+#if FF_API_SWS_CPU_CAPS
+/**
+ * CPU caps are autodetected now, those flags
+ * are only provided for API compatibility.
+ */
+#define SWS_CPU_CAPS_MMX      0x80000000
+#define SWS_CPU_CAPS_MMXEXT   0x20000000
+#define SWS_CPU_CAPS_MMX2     0x20000000
+#define SWS_CPU_CAPS_3DNOW    0x40000000
+#define SWS_CPU_CAPS_ALTIVEC  0x10000000
+#define SWS_CPU_CAPS_BFIN     0x01000000
+#define SWS_CPU_CAPS_SSE2     0x02000000
+#endif
+
+#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
+
+/**
+ * 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
+ */
+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);
+
+#if FF_API_SWS_GETCONTEXT
+/**
+ * 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
+ * @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
+ * @deprecated Use sws_getCachedContext() instead.
+ */
+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);
+#endif
+
+/**
+ * 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);
+
+/**
+ * Allocate and return a vector with length coefficients, all
+ * with the same value c.
+ */
+SwsVector *sws_getConstVec(double c, int length);
+
+/**
+ * Allocate and return a vector with just one coefficient, with
+ * value 1.0.
+ */
+SwsVector *sws_getIdentityVec(void);
+
+/**
+ * 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);
+void sws_convVec(SwsVector *a, SwsVector *b);
+void sws_addVec(SwsVector *a, SwsVector *b);
+void sws_subVec(SwsVector *a, SwsVector *b);
+void sws_shiftVec(SwsVector *a, int shift);
+
+/**
+ * Allocate and return a clone of the vector a, that is a vector
+ * with the same coefficients as a.
+ */
+SwsVector *sws_cloneVec(SwsVector *a);
+
+/**
+ * Print with av_log() a textual representation of the vector a
+ * if log_level <= av_log_level.
+ */
+void sws_printVec2(SwsVector *a, AVClass *log_ctx, int log_level);
+
+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 */