check for channels<=0 and print a reasonable error message
[libav.git] / libswscale / swscale.h
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fe8054c0 1/*
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2 * Copyright (C) 2001-2003 Michael Niedermayer <michaelni@gmx.at>
3 *
4 * This file is part of FFmpeg.
5 *
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6 * FFmpeg is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Lesser General Public
8 * License as published by the Free Software Foundation; either
9 * version 2.1 of the License, or (at your option) any later version.
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10 *
11 * FFmpeg is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * Lesser General Public License for more details.
d026b45e 15 *
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16 * You should have received a copy of the GNU Lesser General Public
17 * License along with FFmpeg; if not, write to the Free Software
d026b45e 18 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
d026b45e 19 */
3db822b0 20
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21#ifndef SWSCALE_H
22#define SWSCALE_H
23
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24/**
25 * @file swscale.h
6a4970ab 26 * @brief
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27 * external api for the swscale stuff
28 */
29
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30#include "avutil.h"
31
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32#ifdef __cplusplus
33extern "C" {
34#endif
5427e242 35
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36#define AV_STRINGIFY(s) AV_TOSTRING(s)
37#define AV_TOSTRING(s) #s
38
39#define LIBSWSCALE_VERSION_INT ((0<<16)+(5<<8)+0)
40#define LIBSWSCALE_VERSION 0.5.0
41#define LIBSWSCALE_BUILD LIBSWSCALE_VERSION_INT
42
43#define LIBSWSCALE_IDENT "SwS" AV_STRINGIFY(LIBSWSCALE_VERSION)
44
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45/* values for the flags, the stuff on the command line is different */
46#define SWS_FAST_BILINEAR 1
47#define SWS_BILINEAR 2
48#define SWS_BICUBIC 4
49#define SWS_X 8
ff7ba856 50#define SWS_POINT 0x10
d8863d37 51#define SWS_AREA 0x20
81a571a8 52#define SWS_BICUBLIN 0x40
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53#define SWS_GAUSS 0x80
54#define SWS_SINC 0x100
55#define SWS_LANCZOS 0x200
56#define SWS_SPLINE 0x400
1e621b18 57
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58#define SWS_SRC_V_CHR_DROP_MASK 0x30000
59#define SWS_SRC_V_CHR_DROP_SHIFT 16
5859233b 60
66d1cdb6 61#define SWS_PARAM_DEFAULT 123456
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62
63#define SWS_PRINT_INFO 0x1000
64
65//the following 3 flags are not completly implemented
1e621b18 66//internal chrominace subsamling info
985c5133 67#define SWS_FULL_CHR_H_INT 0x2000
1e621b18 68//input subsampling info
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69#define SWS_FULL_CHR_H_INP 0x4000
70#define SWS_DIRECT_BGR 0x8000
bca11e75 71#define SWS_ACCURATE_RND 0x40000
1e621b18 72
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73#define SWS_CPU_CAPS_MMX 0x80000000
74#define SWS_CPU_CAPS_MMX2 0x20000000
75#define SWS_CPU_CAPS_3DNOW 0x40000000
a2faa401 76#define SWS_CPU_CAPS_ALTIVEC 0x10000000
516b1f82 77
c7f822d9 78#define SWS_MAX_REDUCE_CUTOFF 0.002
28bf81c9 79
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80#define SWS_CS_ITU709 1
81#define SWS_CS_FCC 4
82#define SWS_CS_ITU601 5
83#define SWS_CS_ITU624 5
84#define SWS_CS_SMPTE170M 5
85#define SWS_CS_SMPTE240M 7
86#define SWS_CS_DEFAULT 5
87
77a49659 88
28bf81c9 89
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90// when used for filters they must have an odd number of elements
91// coeffs cannot be shared between vectors
28bf81c9 92typedef struct {
c7f822d9 93 double *coeff;
28bf81c9 94 int length;
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95} SwsVector;
96
97// vectors can be shared
98typedef struct {
99 SwsVector *lumH;
100 SwsVector *lumV;
101 SwsVector *chrH;
102 SwsVector *chrV;
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103} SwsFilter;
104
d4e24275 105struct SwsContext;
077ea8a7 106
d4e24275 107void sws_freeContext(struct SwsContext *swsContext);
28bf81c9 108
d4e24275 109struct SwsContext *sws_getContext(int srcW, int srcH, int srcFormat, int dstW, int dstH, int dstFormat, int flags,
66d1cdb6 110 SwsFilter *srcFilter, SwsFilter *dstFilter, double *param);
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111int sws_scale(struct SwsContext *context, uint8_t* src[], int srcStride[], int srcSliceY,
112 int srcSliceH, uint8_t* dst[], int dstStride[]);
fccb9b2b 113int sws_scale_ordered(struct SwsContext *context, uint8_t* src[], int srcStride[], int srcSliceY,
d28ef270 114 int srcSliceH, uint8_t* dst[], int dstStride[]) attribute_deprecated;
d4e24275 115
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116
117int sws_setColorspaceDetails(struct SwsContext *c, const int inv_table[4], int srcRange, const int table[4], int dstRange, int brightness, int contrast, int saturation);
118int sws_getColorspaceDetails(struct SwsContext *c, int **inv_table, int *srcRange, int **table, int *dstRange, int *brightness, int *contrast, int *saturation);
119SwsVector *sws_getGaussianVec(double variance, double quality);
120SwsVector *sws_getConstVec(double c, int length);
121SwsVector *sws_getIdentityVec(void);
122void sws_scaleVec(SwsVector *a, double scalar);
123void sws_normalizeVec(SwsVector *a, double height);
124void sws_convVec(SwsVector *a, SwsVector *b);
125void sws_addVec(SwsVector *a, SwsVector *b);
126void sws_subVec(SwsVector *a, SwsVector *b);
127void sws_shiftVec(SwsVector *a, int shift);
128SwsVector *sws_cloneVec(SwsVector *a);
129
130void sws_printVec(SwsVector *a);
131void sws_freeVec(SwsVector *a);
132
6a4970ab 133SwsFilter *sws_getDefaultFilter(float lumaGBlur, float chromaGBlur,
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134 float lumaSarpen, float chromaSharpen,
135 float chromaHShift, float chromaVShift,
136 int verbose);
137void sws_freeFilter(SwsFilter *filter);
138
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139struct SwsContext *sws_getCachedContext(struct SwsContext *context,
140 int srcW, int srcH, int srcFormat,
141 int dstW, int dstH, int dstFormat, int flags,
142 SwsFilter *srcFilter, SwsFilter *dstFilter, double *param);
143
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144#ifdef __cplusplus
145}
146#endif
28bf81c9 147
5427e242 148#endif