126 lines
4.2 KiB
C
126 lines
4.2 KiB
C
/*
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* Copyright (C) 2010 Georg Martius <georg.martius@web.de>
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* Copyright (C) 2010 Daniel G. Taylor <dan@programmer-art.org>
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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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/**
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* @file libavfilter/transform.h
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* transform input video
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*
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* All matrices are defined as a single 9-item block of contiguous memory. For
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* example, the identity matrix would be:
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*
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* float *matrix = {1, 0, 0,
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* 0, 1, 0,
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* 0, 0, 1};
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*/
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enum InterpolateMethod {
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INTERPOLATE_NEAREST, //< Nearest-neighbor (fast)
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INTERPOLATE_BILINEAR, //< Bilinear
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INTERPOLATE_BIQUADRATIC, //< Biquadratic (best)
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INTERPOLATE_COUNT, //< Number of interpolation methods
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};
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// Shortcuts for the fastest and best interpolation methods
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#define INTERPOLATE_DEFAULT INTERPOLATE_BILINEAR
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#define INTERPOLATE_FAST INTERPOLATE_NEAREST
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#define INTERPOLATE_BEST INTERPOLATE_BIQUADRATIC
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enum FillMethod {
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FILL_BLANK, //< Fill zeroes at blank locations
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FILL_ORIGINAL, //< Original image at blank locations
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FILL_CLAMP, //< Extruded edge value at blank locations
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FILL_MIRROR, //< Mirrored edge at blank locations
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FILL_COUNT, //< Number of edge fill methods
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};
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// Shortcuts for fill methods
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#define FILL_DEFAULT FILL_ORIGINAL
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/**
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* Get an affine transformation matrix from a given translation, rotation, and
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* zoom factor. The matrix will look like:
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*
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* [ zoom * cos(angle), -sin(angle), x_shift,
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* sin(angle), zoom * cos(angle), y_shift,
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0, 0, 1 ]
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*
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* Paramters:
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* x_shift: Horizontal translation
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* y_shift: Vertical translation
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* angle: Rotation in radians
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* zoom: Scale percent (1.0 = 100%)
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* matrix: 9-item affine transformation matrix
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*/
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void avfilter_get_matrix(float x_shift, float y_shift, float angle, float zoom, float *matrix);
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/**
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* Add two matrices together. result = m1 + m2.
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*
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* Parameters:
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* m1: 9-item transformation matrix
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* m2: 9-item transformation matrix
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* result: 9-item transformation matrix
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*/
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void avfilter_add_matrix(const float *m1, const float *m2, float *result);
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/**
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* Subtract one matrix from another. result = m1 - m2.
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*
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* Parameters:
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* m1: 9-item transformation matrix
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* m2: 9-item transformation matrix
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* result: 9-item transformation matrix
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*/
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void avfilter_sub_matrix(const float *m1, const float *m2, float *result);
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/**
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* Multiply a matrix by a scalar value. result = m1 * scalar.
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*
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* Parameters:
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* m1: 9-item transformation matrix
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* scalar: A number
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* result: 9-item transformation matrix
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*/
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void avfilter_mul_matrix(const float *m1, float scalar, float *result);
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/**
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* Do an affine transformation with the given interpolation method. This
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* multiplies each vector [x,y,1] by the matrix and then interpolates to
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* get the final value.
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*
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* Parameters:
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* src: Source image
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* dst: Destination image
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* src_stride: Source image line size in bytes
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* dst_stride: Destination image line size in bytes
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* width: Image width in pixels
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* height: Image height in pixels
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* matrix: 9-item affine transformation matrix
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* interpolate: Pixel interpolation method
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* fill: Edge fill method
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*/
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void avfilter_transform(const uint8_t *src, uint8_t *dst,
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int src_stride, int dst_stride,
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int width, int height, const float *matrix,
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enum InterpolateMethod interpolate,
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enum FillMethod fill);
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