452 lines
15 KiB
C
452 lines
15 KiB
C
/*
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* XPM image format
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*
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* Copyright (c) 2012 Paul B Mahol
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* Copyright (c) 2017 Paras Chadha
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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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#include "libavutil/parseutils.h"
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#include "libavutil/avstring.h"
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#include "avcodec.h"
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#include "internal.h"
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#define MIN_ELEMENT ' '
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#define MAX_ELEMENT 0xfe
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#define NB_ELEMENTS (MAX_ELEMENT - MIN_ELEMENT + 1)
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typedef struct XPMContext {
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uint32_t *pixels;
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int pixels_size;
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uint8_t *buf;
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int buf_size;
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} XPMDecContext;
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typedef struct ColorEntry {
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const char *name; ///< a string representing the name of the color
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uint32_t rgb_color; ///< RGB values for the color
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} ColorEntry;
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static int color_table_compare(const void *lhs, const void *rhs)
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{
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return av_strcasecmp(lhs, ((const ColorEntry *)rhs)->name);
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}
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static const ColorEntry color_table[] = {
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{ "AliceBlue", 0xFFF0F8FF },
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{ "AntiqueWhite", 0xFFFAEBD7 },
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{ "Aqua", 0xFF00FFFF },
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{ "Aquamarine", 0xFF7FFFD4 },
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{ "Azure", 0xFFF0FFFF },
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{ "Beige", 0xFFF5F5DC },
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{ "Bisque", 0xFFFFE4C4 },
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{ "Black", 0xFF000000 },
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{ "BlanchedAlmond", 0xFFFFEBCD },
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{ "Blue", 0xFF0000FF },
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{ "BlueViolet", 0xFF8A2BE2 },
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{ "Brown", 0xFFA52A2A },
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{ "BurlyWood", 0xFFDEB887 },
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{ "CadetBlue", 0xFF5F9EA0 },
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{ "Chartreuse", 0xFF7FFF00 },
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{ "Chocolate", 0xFFD2691E },
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{ "Coral", 0xFFFF7F50 },
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{ "CornflowerBlue", 0xFF6495ED },
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{ "Cornsilk", 0xFFFFF8DC },
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{ "Crimson", 0xFFDC143C },
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{ "Cyan", 0xFF00FFFF },
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{ "DarkBlue", 0xFF00008B },
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{ "DarkCyan", 0xFF008B8B },
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{ "DarkGoldenRod", 0xFFB8860B },
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{ "DarkGray", 0xFFA9A9A9 },
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{ "DarkGreen", 0xFF006400 },
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{ "DarkKhaki", 0xFFBDB76B },
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{ "DarkMagenta", 0xFF8B008B },
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{ "DarkOliveGreen", 0xFF556B2F },
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{ "Darkorange", 0xFFFF8C00 },
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{ "DarkOrchid", 0xFF9932CC },
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{ "DarkRed", 0xFF8B0000 },
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{ "DarkSalmon", 0xFFE9967A },
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{ "DarkSeaGreen", 0xFF8FBC8F },
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{ "DarkSlateBlue", 0xFF483D8B },
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{ "DarkSlateGray", 0xFF2F4F4F },
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{ "DarkTurquoise", 0xFF00CED1 },
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{ "DarkViolet", 0xFF9400D3 },
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{ "DeepPink", 0xFFFF1493 },
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{ "DeepSkyBlue", 0xFF00BFFF },
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{ "DimGray", 0xFF696969 },
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{ "DodgerBlue", 0xFF1E90FF },
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{ "FireBrick", 0xFFB22222 },
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{ "FloralWhite", 0xFFFFFAF0 },
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{ "ForestGreen", 0xFF228B22 },
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{ "Fuchsia", 0xFFFF00FF },
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{ "Gainsboro", 0xFFDCDCDC },
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{ "GhostWhite", 0xFFF8F8FF },
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{ "Gold", 0xFFFFD700 },
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{ "GoldenRod", 0xFFDAA520 },
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{ "Gray", 0xFFBEBEBE },
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{ "Green", 0xFF00FF00 },
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{ "GreenYellow", 0xFFADFF2F },
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{ "HoneyDew", 0xFFF0FFF0 },
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{ "HotPink", 0xFFFF69B4 },
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{ "IndianRed", 0xFFCD5C5C },
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{ "Indigo", 0xFF4B0082 },
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{ "Ivory", 0xFFFFFFF0 },
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{ "Khaki", 0xFFF0E68C },
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{ "Lavender", 0xFFE6E6FA },
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{ "LavenderBlush", 0xFFFFF0F5 },
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{ "LawnGreen", 0xFF7CFC00 },
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{ "LemonChiffon", 0xFFFFFACD },
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{ "LightBlue", 0xFFADD8E6 },
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{ "LightCoral", 0xFFF08080 },
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{ "LightCyan", 0xFFE0FFFF },
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{ "LightGoldenRodYellow", 0xFFFAFAD2 },
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{ "LightGreen", 0xFF90EE90 },
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{ "LightGrey", 0xFFD3D3D3 },
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{ "LightPink", 0xFFFFB6C1 },
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{ "LightSalmon", 0xFFFFA07A },
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{ "LightSeaGreen", 0xFF20B2AA },
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{ "LightSkyBlue", 0xFF87CEFA },
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{ "LightSlateGray", 0xFF778899 },
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{ "LightSteelBlue", 0xFFB0C4DE },
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{ "LightYellow", 0xFFFFFFE0 },
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{ "Lime", 0xFF00FF00 },
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{ "LimeGreen", 0xFF32CD32 },
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{ "Linen", 0xFFFAF0E6 },
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{ "Magenta", 0xFFFF00FF },
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{ "Maroon", 0xFFB03060 },
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{ "MediumAquaMarine", 0xFF66CDAA },
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{ "MediumBlue", 0xFF0000CD },
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{ "MediumOrchid", 0xFFBA55D3 },
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{ "MediumPurple", 0xFF9370D8 },
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{ "MediumSeaGreen", 0xFF3CB371 },
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{ "MediumSlateBlue", 0xFF7B68EE },
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{ "MediumSpringGreen", 0xFF00FA9A },
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{ "MediumTurquoise", 0xFF48D1CC },
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{ "MediumVioletRed", 0xFFC71585 },
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{ "MidnightBlue", 0xFF191970 },
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{ "MintCream", 0xFFF5FFFA },
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{ "MistyRose", 0xFFFFE4E1 },
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{ "Moccasin", 0xFFFFE4B5 },
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{ "NavajoWhite", 0xFFFFDEAD },
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{ "Navy", 0xFF000080 },
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{ "None", 0x00000000 },
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{ "OldLace", 0xFFFDF5E6 },
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{ "Olive", 0xFF808000 },
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{ "OliveDrab", 0xFF6B8E23 },
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{ "Orange", 0xFFFFA500 },
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{ "OrangeRed", 0xFFFF4500 },
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{ "Orchid", 0xFFDA70D6 },
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{ "PaleGoldenRod", 0xFFEEE8AA },
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{ "PaleGreen", 0xFF98FB98 },
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{ "PaleTurquoise", 0xFFAFEEEE },
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{ "PaleVioletRed", 0xFFD87093 },
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{ "PapayaWhip", 0xFFFFEFD5 },
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{ "PeachPuff", 0xFFFFDAB9 },
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{ "Peru", 0xFFCD853F },
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{ "Pink", 0xFFFFC0CB },
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{ "Plum", 0xFFDDA0DD },
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{ "PowderBlue", 0xFFB0E0E6 },
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{ "Purple", 0xFFA020F0 },
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{ "Red", 0xFFFF0000 },
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{ "RosyBrown", 0xFFBC8F8F },
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{ "RoyalBlue", 0xFF4169E1 },
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{ "SaddleBrown", 0xFF8B4513 },
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{ "Salmon", 0xFFFA8072 },
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{ "SandyBrown", 0xFFF4A460 },
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{ "SeaGreen", 0xFF2E8B57 },
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{ "SeaShell", 0xFFFFF5EE },
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{ "Sienna", 0xFFA0522D },
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{ "Silver", 0xFFC0C0C0 },
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{ "SkyBlue", 0xFF87CEEB },
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{ "SlateBlue", 0xFF6A5ACD },
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{ "SlateGray", 0xFF708090 },
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{ "Snow", 0xFFFFFAFA },
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{ "SpringGreen", 0xFF00FF7F },
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{ "SteelBlue", 0xFF4682B4 },
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{ "Tan", 0xFFD2B48C },
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{ "Teal", 0xFF008080 },
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{ "Thistle", 0xFFD8BFD8 },
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{ "Tomato", 0xFFFF6347 },
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{ "Turquoise", 0xFF40E0D0 },
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{ "Violet", 0xFFEE82EE },
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{ "Wheat", 0xFFF5DEB3 },
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{ "White", 0xFFFFFFFF },
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{ "WhiteSmoke", 0xFFF5F5F5 },
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{ "Yellow", 0xFFFFFF00 },
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{ "YellowGreen", 0xFF9ACD32 }
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};
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static unsigned hex_char_to_number(uint8_t x)
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{
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if (x >= 'a' && x <= 'f')
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x -= 'a' - 10;
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else if (x >= 'A' && x <= 'F')
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x -= 'A' - 10;
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else if (x >= '0' && x <= '9')
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x -= '0';
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else
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x = 0;
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return x;
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}
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/*
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* Function same as strcspn but ignores characters if they are inside a C style comments
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*/
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static size_t mod_strcspn(const char *string, const char *reject)
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{
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int i, j;
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for (i = 0; string && string[i]; i++) {
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if (string[i] == '/' && string[i+1] == '*') {
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i += 2;
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while ( string && string[i] && (string[i] != '*' || string[i+1] != '/') )
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i++;
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i++;
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} else if (string[i] == '/' && string[i+1] == '/') {
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i += 2;
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while ( string && string[i] && string[i] != '\n' )
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i++;
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} else {
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for (j = 0; reject && reject[j]; j++) {
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if (string[i] == reject[j])
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break;
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}
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if (reject && reject[j])
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break;
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}
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}
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return i;
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}
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static uint32_t color_string_to_rgba(const char *p, int len)
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{
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uint32_t ret = 0xFF000000;
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const ColorEntry *entry;
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char color_name[100];
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len = FFMIN(FFMAX(len, 0), sizeof(color_name) - 1);
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if (*p == '#') {
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p++;
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len--;
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if (len == 3) {
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ret |= (hex_char_to_number(p[2]) << 4) |
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(hex_char_to_number(p[1]) << 12) |
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(hex_char_to_number(p[0]) << 20);
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} else if (len == 4) {
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ret = (hex_char_to_number(p[3]) << 4) |
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(hex_char_to_number(p[2]) << 12) |
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(hex_char_to_number(p[1]) << 20) |
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(hex_char_to_number(p[0]) << 28);
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} else if (len == 6) {
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ret |= hex_char_to_number(p[5]) |
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(hex_char_to_number(p[4]) << 4) |
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(hex_char_to_number(p[3]) << 8) |
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(hex_char_to_number(p[2]) << 12) |
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(hex_char_to_number(p[1]) << 16) |
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(hex_char_to_number(p[0]) << 20);
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} else if (len == 8) {
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ret = hex_char_to_number(p[7]) |
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(hex_char_to_number(p[6]) << 4) |
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(hex_char_to_number(p[5]) << 8) |
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(hex_char_to_number(p[4]) << 12) |
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(hex_char_to_number(p[3]) << 16) |
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(hex_char_to_number(p[2]) << 20) |
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(hex_char_to_number(p[1]) << 24) |
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(hex_char_to_number(p[0]) << 28);
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}
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} else {
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strncpy(color_name, p, len);
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color_name[len] = '\0';
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entry = bsearch(color_name,
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color_table,
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FF_ARRAY_ELEMS(color_table),
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sizeof(ColorEntry),
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color_table_compare);
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if (!entry)
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return ret;
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ret = entry->rgb_color;
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}
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return ret;
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}
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static int ascii2index(const uint8_t *cpixel, int cpp)
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{
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const uint8_t *p = cpixel;
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int n = 0, m = 1, i;
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for (i = 0; i < cpp; i++) {
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if (*p < MIN_ELEMENT || *p > MAX_ELEMENT)
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return AVERROR_INVALIDDATA;
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n += (*p++ - MIN_ELEMENT) * m;
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m *= NB_ELEMENTS;
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}
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return n;
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}
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static int xpm_decode_frame(AVCodecContext *avctx, void *data,
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int *got_frame, AVPacket *avpkt)
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{
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XPMDecContext *x = avctx->priv_data;
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AVFrame *p=data;
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const uint8_t *end, *ptr;
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int ncolors, cpp, ret, i, j;
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int64_t size;
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uint32_t *dst;
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int width, height;
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avctx->pix_fmt = AV_PIX_FMT_BGRA;
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av_fast_padded_malloc(&x->buf, &x->buf_size, avpkt->size);
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if (!x->buf)
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return AVERROR(ENOMEM);
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memcpy(x->buf, avpkt->data, avpkt->size);
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x->buf[avpkt->size] = 0;
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ptr = x->buf;
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end = x->buf + avpkt->size;
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while (end - ptr > 9 && memcmp(ptr, "/* XPM */", 9))
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ptr++;
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if (end - ptr <= 9) {
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av_log(avctx, AV_LOG_ERROR, "missing signature\n");
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return AVERROR_INVALIDDATA;
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}
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ptr += mod_strcspn(ptr, "\"");
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if (sscanf(ptr, "\"%u %u %u %u\",",
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&width, &height, &ncolors, &cpp) != 4) {
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av_log(avctx, AV_LOG_ERROR, "missing image parameters\n");
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return AVERROR_INVALIDDATA;
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}
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if ((ret = ff_set_dimensions(avctx, width, height)) < 0)
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return ret;
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if (cpp <= 0 || cpp >= 5) {
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av_log(avctx, AV_LOG_ERROR, "unsupported/invalid number of chars per pixel: %d\n", cpp);
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return AVERROR_INVALIDDATA;
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}
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size = 1;
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for (i = 0; i < cpp; i++)
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size *= NB_ELEMENTS;
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if (ncolors <= 0 || ncolors > size) {
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av_log(avctx, AV_LOG_ERROR, "invalid number of colors: %d\n", ncolors);
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return AVERROR_INVALIDDATA;
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}
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if (size > SIZE_MAX / 4)
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return AVERROR(ENOMEM);
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size *= 4;
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ptr += mod_strcspn(ptr, ",") + 1;
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if (end - ptr < 1)
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return AVERROR_INVALIDDATA;
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if ((ret = ff_get_buffer(avctx, p, 0)) < 0)
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return ret;
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av_fast_padded_malloc(&x->pixels, &x->pixels_size, size);
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if (!x->pixels)
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return AVERROR(ENOMEM);
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for (i = 0; i < ncolors; i++) {
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const uint8_t *index;
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int len;
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ptr += mod_strcspn(ptr, "\"") + 1;
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if (end - ptr < cpp)
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return AVERROR_INVALIDDATA;
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index = ptr;
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ptr += cpp;
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ptr = strstr(ptr, "c ");
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if (ptr) {
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ptr += 2;
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} else {
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return AVERROR_INVALIDDATA;
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}
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len = strcspn(ptr, "\" ");
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if ((ret = ascii2index(index, cpp)) < 0)
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return ret;
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x->pixels[ret] = color_string_to_rgba(ptr, len);
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ptr += mod_strcspn(ptr, ",") + 1;
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if (end - ptr < 1)
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return AVERROR_INVALIDDATA;
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}
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for (i = 0; i < avctx->height; i++) {
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dst = (uint32_t *)(p->data[0] + i * p->linesize[0]);
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if (end - ptr < 1)
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return AVERROR_INVALIDDATA;
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ptr += mod_strcspn(ptr, "\"") + 1;
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if (end - ptr < 1)
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return AVERROR_INVALIDDATA;
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for (j = 0; j < avctx->width; j++) {
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if (end - ptr < cpp)
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return AVERROR_INVALIDDATA;
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if ((ret = ascii2index(ptr, cpp)) < 0)
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return ret;
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*dst++ = x->pixels[ret];
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ptr += cpp;
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}
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ptr += mod_strcspn(ptr, ",") + 1;
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}
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p->key_frame = 1;
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p->pict_type = AV_PICTURE_TYPE_I;
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*got_frame = 1;
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return avpkt->size;
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}
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static av_cold int xpm_decode_close(AVCodecContext *avctx)
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{
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XPMDecContext *x = avctx->priv_data;
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av_freep(&x->pixels);
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av_freep(&x->buf);
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x->buf_size = 0;
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return 0;
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}
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AVCodec ff_xpm_decoder = {
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.name = "xpm",
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.type = AVMEDIA_TYPE_VIDEO,
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.id = AV_CODEC_ID_XPM,
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.priv_data_size = sizeof(XPMDecContext),
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.close = xpm_decode_close,
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.decode = xpm_decode_frame,
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.capabilities = AV_CODEC_CAP_DR1,
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.long_name = NULL_IF_CONFIG_SMALL("XPM (X PixMap) image")
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};
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