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convert/convert_helper.h
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1 // Avisynth v2.5. Copyright 2002 Ben Rudiak-Gould et al.
2 // http://avisynth.nl
3
4 // This program is free software; you can redistribute it and/or modify
5 // it under the terms of the GNU General Public License as published by
6 // the Free Software Foundation; either version 2 of the License, or
7 // (at your option) any later version.
8 //
9 // This program is distributed in the hope that it will be useful,
10 // but WITHOUT ANY WARRANTY; without even the implied warranty of
11 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 // GNU General Public License for more details.
13 //
14 // You should have received a copy of the GNU General Public License
15 // along with this program; if not, write to the Free Software
16 // Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA, or visit
17 // http://www.gnu.org/copyleft/gpl.html .
18 //
19 // Linking Avisynth statically or dynamically with other modules is making a
20 // combined work based on Avisynth. Thus, the terms and conditions of the GNU
21 // General Public License cover the whole combination.
22 //
23 // As a special exception, the copyright holders of Avisynth give you
24 // permission to link Avisynth with independent modules that communicate with
25 // Avisynth solely through the interfaces defined in avisynth.h, regardless of the license
26 // terms of these independent modules, and to copy and distribute the
27 // resulting combined work under terms of your choice, provided that
28 // every copy of the combined work is accompanied by a complete copy of
29 // the source code of Avisynth (the version of Avisynth used to produce the
30 // combined work), being distributed under the terms of the GNU General
31 // Public License plus this exception. An independent module is a module
32 // which is not derived from or based on Avisynth, such as 3rd-party filters,
33 // import and export plugins, or graphical user interfaces.
34
35 #ifndef __Convert_helper_H__
36 #define __Convert_helper_H__
37
38 #include <avisynth.h>
39 #include <string>
40 #include <cstring>
41
42 // ITU-T H.265 (Table E.1)
43 typedef enum ColorRange_e {
44 AVS_RANGE_LIMITED = 0, // video_full_range_flag = 0, studio swing, e.g. 16-235 for 8-bit luma
45 AVS_RANGE_FULL = 1, // video_full_range_flag = 1, full swing, e.g. 0-255 for 8-bit luma
46 } ColorRange_e;
47
48 // Old constants borrowed from VapourSynth, which transitioned to the ITU-T H.265 standard (Table E.1)
49 // Just the opposite as the standard.
50 typedef enum ColorRange_Compat_e {
51 AVS_COLORRANGE_FULL = 0,
52 AVS_COLORRANGE_LIMITED = 1
53 } ColorRange_Compat_e;
54
55 typedef enum ChromaLocation_e {
56 AVS_CHROMA_UNUSED = -1,
57 AVS_CHROMA_LEFT = 0,
58 AVS_CHROMA_CENTER = 1,
59 AVS_CHROMA_TOP_LEFT = 2,
60 AVS_CHROMA_TOP = 3,
61 AVS_CHROMA_BOTTOM_LEFT = 4,
62 AVS_CHROMA_BOTTOM = 5,
63 AVS_CHROMA_DV = 6 // Special to Avisynth
64 } ChromaLocation_e;
65
66 typedef enum FieldBased_e {
67 AVS_FIELD_PROGRESSIVE = 0,
68 AVS_FIELD_BOTTOM = 1,
69 AVS_FIELD_TOP = 2
70 } FieldBased_e;
71
72 // https://www.itu.int/rec/T-REC-H.265-202108-I
73 /* ITU-T H.265 Table E.5 */
74 typedef enum Matrix_e {
75 AVS_MATRIX_RGB = 0, /* The identity matrix. Typically used for RGB, may also be used for XYZ */
76 AVS_MATRIX_BT709 = 1, /* ITU-R Rec. BT.709-5 */
77 AVS_MATRIX_UNSPECIFIED = 2, /* Image characteristics are unknown or are determined by the application */
78 AVS_MATRIX_BT470_M = 4, // instead of AVS_MATRIX_FCC
79 // FCC Title 47 Code of Federal Regulations (2003) 73.682 (a) (20)
80 // Rec. ITU-R BT.470-6 System M (historical)
81 AVS_MATRIX_BT470_BG = 5, /* Equivalent to 6. */
82 // ITU-R Rec. BT.470-6 System B, G (historical)
83 // Rec. ITU-R BT.601-7 625
84 // Rec. ITU-R BT.1358-0 625 (historical)
85 // Rec. ITU-R BT.1700-0 625 PAL and 625 SECAM
86 AVS_MATRIX_ST170_M = 6, /* Equivalent to 5. */
87 // Rec. ITU-R BT.601-7 525
88 // Rec. ITU-R BT.1358-1 525 or 625 (historical)
89 // Rec. ITU-R BT.1700-0 NTSC
90 // SMPTE ST 170 (2004)
91 // SMPTE 170M (2004)
92 AVS_MATRIX_ST240_M = 7, // SMPTE ST 240 (1999, historical)
93 AVS_MATRIX_YCGCO = 8,
94 AVS_MATRIX_BT2020_NCL = 9,
95 // Rec. ITU-R BT.2020 non-constant luminance system
96 // Rec. ITU-R BT.2100-2 Y'CbCr
97 AVS_MATRIX_BT2020_CL = 10, /* Rec. ITU-R BT.2020 constant luminance system */
98 AVS_MATRIX_CHROMATICITY_DERIVED_NCL = 12, /* Chromaticity derived non-constant luminance system */
99 AVS_MATRIX_CHROMATICITY_DERIVED_CL = 13, /* Chromaticity derived constant luminance system */
100 AVS_MATRIX_ICTCP = 14, // REC_2100_ICTCP, Rec. ITU-R BT.2100-2 ICTCP
101 AVS_MATRIX_AVERAGE = 9999, // Avisynth compatibility
102 } Matrix_e;
103
104 // Pre-Avisynth 3.7.1 matrix constants, with implicite PC/limited range
105 typedef enum Old_Avs_Matrix_e {
106 AVS_OLD_MATRIX_Rec601 = 0,
107 AVS_OLD_MATRIX_Rec709 = 1,
108 AVS_OLD_MATRIX_PC_601 = 2,
109 AVS_OLD_MATRIX_PC_709 = 3,
110 AVS_OLD_MATRIX_AVERAGE = 4,
111 AVS_OLD_MATRIX_Rec2020 = 5,
112 AVS_OLD_MATRIX_PC_2020 = 6
113 } Old_Avs_Matrix_e;
114
115 // transfer characteristics ITU-T H.265 Table E.4
116 typedef enum Transfer_e {
117 AVS_TRANSFER_BT709 = 1,
118 AVS_TRANSFER_UNSPECIFIED = 2,
119 AVS_TRANSFER_BT470_M = 4,
120 AVS_TRANSFER_BT470_BG = 5,
121 AVS_TRANSFER_BT601 = 6, /* Equivalent to 1. */
122 AVS_TRANSFER_ST240_M = 7,
123 AVS_TRANSFER_LINEAR = 8,
124 AVS_TRANSFER_LOG_100 = 9,
125 AVS_TRANSFER_LOG_316 = 10,
126 AVS_TRANSFER_IEC_61966_2_4 = 11,
127 AVS_TRANSFER_IEC_61966_2_1 = 13,
128 AVS_TRANSFER_BT2020_10 = 14, /* Equivalent to 1. */
129 AVS_TRANSFER_BT2020_12 = 15, /* Equivalent to 1. */
130 AVS_TRANSFER_ST2084 = 16,
131 AVS_TRANSFER_ARIB_B67 = 18
132 } Transfer_e;
133
134 // color primaries ITU-T H.265 Table E.3
135 typedef enum Primaries_e {
136 AVS_PRIMARIES_BT709 = 1,
137 AVS_PRIMARIES_UNSPECIFIED = 2,
138 AVS_PRIMARIES_BT470_M = 4,
139 AVS_PRIMARIES_BT470_BG = 5,
140 AVS_PRIMARIES_ST170_M = 6,
141 AVS_PRIMARIES_ST240_M = 7, /* Equivalent to 6. */
142 AVS_PRIMARIES_FILM = 8,
143 AVS_PRIMARIES_BT2020 = 9,
144 AVS_PRIMARIES_ST428 = 10,
145 AVS_PRIMARIES_ST431_2 = 11,
146 AVS_PRIMARIES_ST432_1 = 12,
147 AVS_PRIMARIES_EBU3213_E = 22
148 } Primaries_e;
149
150 void matrix_parse_merge_with_props(bool rgb_in, bool rgb_out, const char* matrix_name, const AVSMap* props, int& _Matrix, int& _ColorRange, int& ColorRange_Out, IScriptEnvironment* env);
151 void matrix_parse_merge_with_props_def(bool rgb_in, bool rgb_out, const char* matrix_name, const AVSMap* props, int& _Matrix, int& _ColorRange, int& ColorRange_Out, int _Matrix_Default, int _ColorRange_Default, IScriptEnvironment* env);
152 void chromaloc_parse_merge_with_props(VideoInfo& vi, const char* chromaloc_name, const AVSMap* props, int& _ChromaLocation, int _ChromaLocation_Default, IScriptEnvironment* env);
153
154 void update_Matrix_and_ColorRange(AVSMap* props, int theMatrix, int theColorRange, IScriptEnvironment* env);
155 void update_Transfer_and_Primaries(AVSMap* props, int theTransfer, int thePrimaries, IScriptEnvironment* env);
156 void update_ColorRange(AVSMap* props, int theColorRange, IScriptEnvironment* env);
157 void update_ChromaLocation(AVSMap* props, int theChromaLocation, IScriptEnvironment* env);
158
159 typedef struct bits_conv_constants {
160 float src_offset = 0.0f;
161 int src_offset_i = 0;
162 float mul_factor = 1.0f;
163 float dst_offset = 0.0f;
164 float src_span = 1.0f;
165 float dst_span = 1.0f;
166 } bits_conv_constants;
167
168 // universal transform values for any full-limited bit-depth mix
169 [[maybe_unused]] static AVS_FORCEINLINE void get_bits_conv_constants(bits_conv_constants& d, bool use_chroma, bool fulls, bool fulld, int srcBitDepth, int dstBitDepth)
170 {
171 11451 d.src_offset = 0.0f;
172 11451 d.mul_factor = 1.0f;
173 11451 d.dst_offset = 0.0f;
174 11451 d.src_span = 1.0f;
175 11451 d.dst_span = 1.0f;
176
177 // possible usage places
178 // Expr (autoscale, scalef, scaleb)
179 // convert_bits
180 // ColorYUV
181 // Histogram
182 // YUV->RGB conversions (matrix coefficients depend on full-limited, but also the scaling of the actual pixel values, so this is needed for both matrix and pixel value conversion)
183
184
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 11451 if (use_chroma) {
185 // decision: 'limited' range float +/-112 is +/-112/255.0. Must be consistent with Expr, ColorYUV etc
186 // 3.7.2: full range chroma: as per ITU Rec H.273 eq.30 p.10: Cb=Clip1_C(Round(((1<<BitDepth_C)-1)*E'_PB)+(1<<(BitDepth_C-1)))
187 // For 8 bit this results in 128 +/-127.5 instead of 128 +/-127
188 // In general the span is ((1 << srcBitDepth) - 1) / 2.0 instead of (1 << (srcBitDepth - 1)) - 1
189
190 // a bit asymmetric but meets mpeg, jpeg, Rec.2020 industry standards:
191 // full range chroma span intentionally not 128 bit 255/2.0, which is virtually 127.5.
192 // This also gives identical results to e.g. zimg when used in full range YUV-RGB conversions, which is good for consistency.
193
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 428 d.src_span = (srcBitDepth == 32) ?
194
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 346 (fulls ? (float)((1 << srcBitDepth) - 1) / 2.0f : (float)(112 << (srcBitDepth - 8)));
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 351 (fulld ? (float)((1 << dstBitDepth) - 1) / 2.0f : (float)(112 << (dstBitDepth - 8)));
199 // chroma use case: go into signed world, factor, then go back to biased range
200
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 387 d.src_offset = (srcBitDepth == 32) ? 0.0f : (1 << (srcBitDepth - 1));
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 387 d.dst_offset = (dstBitDepth == 32) ? 0.0f : (1 << (dstBitDepth - 1));
202
203 /*
204 fulls=fulld=false case:
205 // mul/div by 2^N when between 8-16 bit integer formats
206 // 255*: for consistent float conversion. scale (shift) to/from 8 bit. int-float is always 0..1.0 <-> 0..255
207 // int-float: 10+ bits first downshift to 8 bits then /255.
208 // float-int: 10+ bits first *255 to have 0..255 range, then shift from 8 bits to actual bit depth
209 // Since first we convert to 8 bit 0-255 range and do bit-shift after then to >8 depths, the 1.0 number will show up as 255*256 in 16 bits.
210 // This is normal. Like float32.ConvertBits(8).ConvertBits(16)
211 (srcBitDepth == 32) -> (255 * (float)(1 << (dstBitDepth - 8)) / 1.0
212 (dstBitDepth == 32) -> 1.0 / (255 * (float)(1 << (srcBitDepth - 8)))
213
214 (srcBitDepth == 32) -> ((float)(1 << (dstBitDepth - 8)))) / (1 / 255.0f)
215 (dstBitDepth == 32) -> 1.0 / 255.0f / (float)(1 << (srcBitDepth - 8))))
216 */
217 }
218 else {
219 // luma
220
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221
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 10312 (fulls ? 1.0f : 219 / 255.0f) :
222 752 (fulls ? ((1 << srcBitDepth) - 1) : (219 << (srcBitDepth - 8))); // 0..255, 16..235
223
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224
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 391 (fulld ? 1.0f : 219 / 255.0f) :
225 10673 (fulld ? ((1 << dstBitDepth) - 1) : (219 << (dstBitDepth - 8)));
226 // luma
227
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229 364 (fulls ? 0 : (16 << (srcBitDepth - 8)));
230
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232 211 (fulld ? 0 : (16 << (dstBitDepth - 8)));
233 }
234
235 11451 d.mul_factor = d.dst_span / d.src_span;
236 11451 d.src_offset_i = (int)d.src_offset; // no rounding, when used, it is integer
237 11451 }
238
239 enum class ConversionDirection {
240 YUV_TO_RGB,
241 RGB_TO_YUV,
242 YUV_TO_YUV,
243 RGB_TO_RGB,
244 RGB_TO_Y
245 };
246
247 #endif // __Convert_helper_H__
248