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2134
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1 /*
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2 * Copyright (C) 2001-2011 Michael Niedermayer <michaelni@gmx.at>
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3 *
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4 * This file is part of FFmpeg.
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5 *
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6 * FFmpeg is free software; you can redistribute it and/or
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7 * modify it under the terms of the GNU Lesser General Public
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8 * License as published by the Free Software Foundation; either
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9 * version 2.1 of the License, or (at your option) any later version.
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10 *
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11 * FFmpeg is distributed in the hope that it will be useful,
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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
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14 * Lesser General Public License for more details.
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15 *
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16 * You should have received a copy of the GNU Lesser General Public
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17 * License along with FFmpeg; if not, write to the Free Software
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18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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19 */
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20
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21 #ifndef SWSCALE_SWSCALE_H
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22 #define SWSCALE_SWSCALE_H
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23
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24 /**
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25 * @file
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26 * @ingroup lsws
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27 * external API header
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28 */
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29
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30 /**
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31 * @defgroup lsws Libswscale
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32 * @{
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33 */
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34
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35 #include <stdint.h>
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36
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37 #include "../libavutil/avutil.h"
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38 #include "../libavutil/log.h"
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39 #include "../libavutil/pixfmt.h"
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40 #include "version.h"
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41
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42 /**
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43 * Return the LIBSWSCALE_VERSION_INT constant.
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44 */
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45 unsigned swscale_version(void);
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46
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47 /**
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48 * Return the libswscale build-time configuration.
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49 */
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50 const char *swscale_configuration(void);
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51
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52 /**
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53 * Return the libswscale license.
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54 */
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55 const char *swscale_license(void);
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56
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57 /* values for the flags, the stuff on the command line is different */
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58 #define SWS_FAST_BILINEAR 1
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59 #define SWS_BILINEAR 2
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60 #define SWS_BICUBIC 4
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61 #define SWS_X 8
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62 #define SWS_POINT 0x10
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63 #define SWS_AREA 0x20
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64 #define SWS_BICUBLIN 0x40
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65 #define SWS_GAUSS 0x80
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66 #define SWS_SINC 0x100
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67 #define SWS_LANCZOS 0x200
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68 #define SWS_SPLINE 0x400
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69
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70 #define SWS_SRC_V_CHR_DROP_MASK 0x30000
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71 #define SWS_SRC_V_CHR_DROP_SHIFT 16
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72
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73 #define SWS_PARAM_DEFAULT 123456
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74
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75 #define SWS_PRINT_INFO 0x1000
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76
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77 //the following 3 flags are not completely implemented
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78 //internal chrominace subsampling info
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79 #define SWS_FULL_CHR_H_INT 0x2000
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80 //input subsampling info
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81 #define SWS_FULL_CHR_H_INP 0x4000
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82 #define SWS_DIRECT_BGR 0x8000
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83 #define SWS_ACCURATE_RND 0x40000
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84 #define SWS_BITEXACT 0x80000
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85 #define SWS_ERROR_DIFFUSION 0x800000
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86
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87 #if FF_API_SWS_CPU_CAPS
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88 /**
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89 * CPU caps are autodetected now, those flags
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90 * are only provided for API compatibility.
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91 */
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92 #define SWS_CPU_CAPS_MMX 0x80000000
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93 #define SWS_CPU_CAPS_MMXEXT 0x20000000
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94 #define SWS_CPU_CAPS_MMX2 0x20000000
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95 #define SWS_CPU_CAPS_3DNOW 0x40000000
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96 #define SWS_CPU_CAPS_ALTIVEC 0x10000000
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97 #define SWS_CPU_CAPS_BFIN 0x01000000
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98 #define SWS_CPU_CAPS_SSE2 0x02000000
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99 #endif
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100
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101 #define SWS_MAX_REDUCE_CUTOFF 0.002
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102
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103 #define SWS_CS_ITU709 1
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104 #define SWS_CS_FCC 4
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105 #define SWS_CS_ITU601 5
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106 #define SWS_CS_ITU624 5
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107 #define SWS_CS_SMPTE170M 5
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108 #define SWS_CS_SMPTE240M 7
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109 #define SWS_CS_DEFAULT 5
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110
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111 /**
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112 * Return a pointer to yuv<->rgb coefficients for the given colorspace
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113 * suitable for sws_setColorspaceDetails().
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114 *
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115 * @param colorspace One of the SWS_CS_* macros. If invalid,
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116 * SWS_CS_DEFAULT is used.
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117 */
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118 const int *sws_getCoefficients(int colorspace);
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119
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120 // when used for filters they must have an odd number of elements
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121 // coeffs cannot be shared between vectors
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122 typedef struct SwsVector {
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123 double *coeff; ///< pointer to the list of coefficients
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124 int length; ///< number of coefficients in the vector
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125 } SwsVector;
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126
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127 // vectors can be shared
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128 typedef struct SwsFilter {
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129 SwsVector *lumH;
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130 SwsVector *lumV;
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131 SwsVector *chrH;
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132 SwsVector *chrV;
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133 } SwsFilter;
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134
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135 struct SwsContext;
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136
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137 /**
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138 * Return a positive value if pix_fmt is a supported input format, 0
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139 * otherwise.
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140 */
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141 int sws_isSupportedInput(enum AVPixelFormat pix_fmt);
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142
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143 /**
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144 * Return a positive value if pix_fmt is a supported output format, 0
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145 * otherwise.
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146 */
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147 int sws_isSupportedOutput(enum AVPixelFormat pix_fmt);
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148
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149 /**
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150 * @param[in] pix_fmt the pixel format
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151 * @return a positive value if an endianness conversion for pix_fmt is
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152 * supported, 0 otherwise.
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153 */
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154 int sws_isSupportedEndiannessConversion(enum AVPixelFormat pix_fmt);
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155
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156 /**
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157 * Allocate an empty SwsContext. This must be filled and passed to
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158 * sws_init_context(). For filling see AVOptions, options.c and
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159 * sws_setColorspaceDetails().
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160 */
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161 struct SwsContext *sws_alloc_context(void);
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162
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163 /**
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164 * Initialize the swscaler context sws_context.
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165 *
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166 * @return zero or positive value on success, a negative value on
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167 * error
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168 */
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169 int sws_init_context(struct SwsContext *sws_context, SwsFilter *srcFilter, SwsFilter *dstFilter);
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170
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171 /**
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172 * Free the swscaler context swsContext.
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173 * If swsContext is NULL, then does nothing.
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174 */
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175 void sws_freeContext(struct SwsContext *swsContext);
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176
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177 #if FF_API_SWS_GETCONTEXT
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178 /**
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179 * Allocate and return an SwsContext. You need it to perform
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180 * scaling/conversion operations using sws_scale().
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181 *
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182 * @param srcW the width of the source image
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183 * @param srcH the height of the source image
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184 * @param srcFormat the source image format
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185 * @param dstW the width of the destination image
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186 * @param dstH the height of the destination image
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187 * @param dstFormat the destination image format
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188 * @param flags specify which algorithm and options to use for rescaling
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189 * @return a pointer to an allocated context, or NULL in case of error
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190 * @note this function is to be removed after a saner alternative is
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191 * written
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192 * @deprecated Use sws_getCachedContext() instead.
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193 */
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194 struct SwsContext *sws_getContext(int srcW, int srcH, enum AVPixelFormat srcFormat,
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195 int dstW, int dstH, enum AVPixelFormat dstFormat,
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196 int flags, SwsFilter *srcFilter,
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197 SwsFilter *dstFilter, const double *param);
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198 #endif
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199
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200 /**
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201 * Scale the image slice in srcSlice and put the resulting scaled
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202 * slice in the image in dst. A slice is a sequence of consecutive
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203 * rows in an image.
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204 *
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205 * Slices have to be provided in sequential order, either in
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206 * top-bottom or bottom-top order. If slices are provided in
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207 * non-sequential order the behavior of the function is undefined.
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208 *
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209 * @param c the scaling context previously created with
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210 * sws_getContext()
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211 * @param srcSlice the array containing the pointers to the planes of
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212 * the source slice
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213 * @param srcStride the array containing the strides for each plane of
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214 * the source image
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215 * @param srcSliceY the position in the source image of the slice to
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216 * process, that is the number (counted starting from
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217 * zero) in the image of the first row of the slice
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218 * @param srcSliceH the height of the source slice, that is the number
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219 * of rows in the slice
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220 * @param dst the array containing the pointers to the planes of
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221 * the destination image
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222 * @param dstStride the array containing the strides for each plane of
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223 * the destination image
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224 * @return the height of the output slice
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225 */
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226 int sws_scale(struct SwsContext *c, const uint8_t *const srcSlice[],
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227 const int srcStride[], int srcSliceY, int srcSliceH,
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228 uint8_t *const dst[], const int dstStride[]);
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229
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230 /**
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231 * @param dstRange flag indicating the while-black range of the output (1=jpeg / 0=mpeg)
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232 * @param srcRange flag indicating the while-black range of the input (1=jpeg / 0=mpeg)
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233 * @param table the yuv2rgb coefficients describing the output yuv space, normally ff_yuv2rgb_coeffs[x]
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234 * @param inv_table the yuv2rgb coefficients describing the input yuv space, normally ff_yuv2rgb_coeffs[x]
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235 * @param brightness 16.16 fixed point brightness correction
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236 * @param contrast 16.16 fixed point contrast correction
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237 * @param saturation 16.16 fixed point saturation correction
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238 * @return -1 if not supported
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239 */
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240 int sws_setColorspaceDetails(struct SwsContext *c, const int inv_table[4],
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241 int srcRange, const int table[4], int dstRange,
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242 int brightness, int contrast, int saturation);
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243
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244 /**
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245 * @return -1 if not supported
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246 */
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247 int sws_getColorspaceDetails(struct SwsContext *c, int **inv_table,
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248 int *srcRange, int **table, int *dstRange,
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249 int *brightness, int *contrast, int *saturation);
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250
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251 /**
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252 * Allocate and return an uninitialized vector with length coefficients.
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253 */
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254 SwsVector *sws_allocVec(int length);
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255
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256 /**
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257 * Return a normalized Gaussian curve used to filter stuff
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258 * quality = 3 is high quality, lower is lower quality.
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259 */
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260 SwsVector *sws_getGaussianVec(double variance, double quality);
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261
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262 /**
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263 * Allocate and return a vector with length coefficients, all
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264 * with the same value c.
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265 */
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266 SwsVector *sws_getConstVec(double c, int length);
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267
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268 /**
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269 * Allocate and return a vector with just one coefficient, with
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270 * value 1.0.
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271 */
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272 SwsVector *sws_getIdentityVec(void);
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273
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274 /**
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275 * Scale all the coefficients of a by the scalar value.
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276 */
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277 void sws_scaleVec(SwsVector *a, double scalar);
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278
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279 /**
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280 * Scale all the coefficients of a so that their sum equals height.
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281 */
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282 void sws_normalizeVec(SwsVector *a, double height);
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283 void sws_convVec(SwsVector *a, SwsVector *b);
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284 void sws_addVec(SwsVector *a, SwsVector *b);
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285 void sws_subVec(SwsVector *a, SwsVector *b);
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286 void sws_shiftVec(SwsVector *a, int shift);
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287
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288 /**
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289 * Allocate and return a clone of the vector a, that is a vector
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290 * with the same coefficients as a.
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291 */
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292 SwsVector *sws_cloneVec(SwsVector *a);
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293
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294 /**
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295 * Print with av_log() a textual representation of the vector a
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296 * if log_level <= av_log_level.
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297 */
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298 void sws_printVec2(SwsVector *a, AVClass *log_ctx, int log_level);
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299
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300 void sws_freeVec(SwsVector *a);
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301
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302 SwsFilter *sws_getDefaultFilter(float lumaGBlur, float chromaGBlur,
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303 float lumaSharpen, float chromaSharpen,
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304 float chromaHShift, float chromaVShift,
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305 int verbose);
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306 void sws_freeFilter(SwsFilter *filter);
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307
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308 /**
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309 * Check if context can be reused, otherwise reallocate a new one.
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310 *
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311 * If context is NULL, just calls sws_getContext() to get a new
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312 * context. Otherwise, checks if the parameters are the ones already
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313 * saved in context. If that is the case, returns the current
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314 * context. Otherwise, frees context and gets a new context with
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315 * the new parameters.
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316 *
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317 * Be warned that srcFilter and dstFilter are not checked, they
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318 * are assumed to remain the same.
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319 */
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320 struct SwsContext *sws_getCachedContext(struct SwsContext *context,
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321 int srcW, int srcH, enum AVPixelFormat srcFormat,
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322 int dstW, int dstH, enum AVPixelFormat dstFormat,
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323 int flags, SwsFilter *srcFilter,
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324 SwsFilter *dstFilter, const double *param);
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325
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326 /**
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327 * Convert an 8-bit paletted frame into a frame with a color depth of 32 bits.
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328 *
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329 * The output frame will have the same packed format as the palette.
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330 *
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331 * @param src source frame buffer
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332 * @param dst destination frame buffer
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333 * @param num_pixels number of pixels to convert
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334 * @param palette array with [256] entries, which must match color arrangement (RGB or BGR) of src
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335 */
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336 void sws_convertPalette8ToPacked32(const uint8_t *src, uint8_t *dst, int num_pixels, const uint8_t *palette);
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337
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338 /**
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339 * Convert an 8-bit paletted frame into a frame with a color depth of 24 bits.
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340 *
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341 * With the palette format "ABCD", the destination frame ends up with the format "ABC".
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342 *
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343 * @param src source frame buffer
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344 * @param dst destination frame buffer
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345 * @param num_pixels number of pixels to convert
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346 * @param palette array with [256] entries, which must match color arrangement (RGB or BGR) of src
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347 */
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348 void sws_convertPalette8ToPacked24(const uint8_t *src, uint8_t *dst, int num_pixels, const uint8_t *palette);
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349
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350 /**
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351 * Get the AVClass for swsContext. It can be used in combination with
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352 * AV_OPT_SEARCH_FAKE_OBJ for examining options.
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353 *
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354 * @see av_opt_find().
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355 */
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356 const AVClass *sws_get_class(void);
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357
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358 /**
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359 * @}
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360 */
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361
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362 #endif /* SWSCALE_SWSCALE_H */
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