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/* | |
* XPM image format | |
* | |
* Copyright (c) 2012 Paul B Mahol | |
* Copyright (c) 2017 Paras Chadha | |
* | |
* This file is part of FFmpeg. | |
* | |
* FFmpeg is free software; you can redistribute it and/or | |
* modify it under the terms of the GNU Lesser General Public | |
* License as published by the Free Software Foundation; either | |
* version 2.1 of the License, or (at your option) any later version. | |
* | |
* FFmpeg is distributed in the hope that it will be useful, | |
* but WITHOUT ANY WARRANTY; without even the implied warranty of | |
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
* Lesser General Public License for more details. | |
* | |
* You should have received a copy of the GNU Lesser General Public | |
* License along with FFmpeg; if not, write to the Free Software | |
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA | |
*/ | |
#include "libavutil/parseutils.h" | |
#include "libavutil/avstring.h" | |
#include "avcodec.h" | |
#include "internal.h" | |
typedef struct XPMContext { | |
uint32_t *pixels; | |
int pixels_size; | |
} XPMDecContext; | |
typedef struct ColorEntry { | |
const char *name; ///< a string representing the name of the color | |
uint32_t rgb_color; ///< RGB values for the color | |
} ColorEntry; | |
static int color_table_compare(const void *lhs, const void *rhs) | |
{ | |
return av_strcasecmp(lhs, ((const ColorEntry *)rhs)->name); | |
} | |
static const ColorEntry color_table[] = { | |
{ "AliceBlue", 0xFFF0F8FF }, | |
{ "AntiqueWhite", 0xFFFAEBD7 }, | |
{ "Aqua", 0xFF00FFFF }, | |
{ "Aquamarine", 0xFF7FFFD4 }, | |
{ "Azure", 0xFFF0FFFF }, | |
{ "Beige", 0xFFF5F5DC }, | |
{ "Bisque", 0xFFFFE4C4 }, | |
{ "Black", 0xFF000000 }, | |
{ "BlanchedAlmond", 0xFFFFEBCD }, | |
{ "Blue", 0xFF0000FF }, | |
{ "BlueViolet", 0xFF8A2BE2 }, | |
{ "Brown", 0xFFA52A2A }, | |
{ "BurlyWood", 0xFFDEB887 }, | |
{ "CadetBlue", 0xFF5F9EA0 }, | |
{ "Chartreuse", 0xFF7FFF00 }, | |
{ "Chocolate", 0xFFD2691E }, | |
{ "Coral", 0xFFFF7F50 }, | |
{ "CornflowerBlue", 0xFF6495ED }, | |
{ "Cornsilk", 0xFFFFF8DC }, | |
{ "Crimson", 0xFFDC143C }, | |
{ "Cyan", 0xFF00FFFF }, | |
{ "DarkBlue", 0xFF00008B }, | |
{ "DarkCyan", 0xFF008B8B }, | |
{ "DarkGoldenRod", 0xFFB8860B }, | |
{ "DarkGray", 0xFFA9A9A9 }, | |
{ "DarkGreen", 0xFF006400 }, | |
{ "DarkKhaki", 0xFFBDB76B }, | |
{ "DarkMagenta", 0xFF8B008B }, | |
{ "DarkOliveGreen", 0xFF556B2F }, | |
{ "Darkorange", 0xFFFF8C00 }, | |
{ "DarkOrchid", 0xFF9932CC }, | |
{ "DarkRed", 0xFF8B0000 }, | |
{ "DarkSalmon", 0xFFE9967A }, | |
{ "DarkSeaGreen", 0xFF8FBC8F }, | |
{ "DarkSlateBlue", 0xFF483D8B }, | |
{ "DarkSlateGray", 0xFF2F4F4F }, | |
{ "DarkTurquoise", 0xFF00CED1 }, | |
{ "DarkViolet", 0xFF9400D3 }, | |
{ "DeepPink", 0xFFFF1493 }, | |
{ "DeepSkyBlue", 0xFF00BFFF }, | |
{ "DimGray", 0xFF696969 }, | |
{ "DodgerBlue", 0xFF1E90FF }, | |
{ "FireBrick", 0xFFB22222 }, | |
{ "FloralWhite", 0xFFFFFAF0 }, | |
{ "ForestGreen", 0xFF228B22 }, | |
{ "Fuchsia", 0xFFFF00FF }, | |
{ "Gainsboro", 0xFFDCDCDC }, | |
{ "GhostWhite", 0xFFF8F8FF }, | |
{ "Gold", 0xFFFFD700 }, | |
{ "GoldenRod", 0xFFDAA520 }, | |
{ "Gray", 0xFF808080 }, | |
{ "Green", 0xFF008000 }, | |
{ "GreenYellow", 0xFFADFF2F }, | |
{ "HoneyDew", 0xFFF0FFF0 }, | |
{ "HotPink", 0xFFFF69B4 }, | |
{ "IndianRed", 0xFFCD5C5C }, | |
{ "Indigo", 0xFF4B0082 }, | |
{ "Ivory", 0xFFFFFFF0 }, | |
{ "Khaki", 0xFFF0E68C }, | |
{ "Lavender", 0xFFE6E6FA }, | |
{ "LavenderBlush", 0xFFFFF0F5 }, | |
{ "LawnGreen", 0xFF7CFC00 }, | |
{ "LemonChiffon", 0xFFFFFACD }, | |
{ "LightBlue", 0xFFADD8E6 }, | |
{ "LightCoral", 0xFFF08080 }, | |
{ "LightCyan", 0xFFE0FFFF }, | |
{ "LightGoldenRodYellow", 0xFFFAFAD2 }, | |
{ "LightGreen", 0xFF90EE90 }, | |
{ "LightGrey", 0xFFD3D3D3 }, | |
{ "LightPink", 0xFFFFB6C1 }, | |
{ "LightSalmon", 0xFFFFA07A }, | |
{ "LightSeaGreen", 0xFF20B2AA }, | |
{ "LightSkyBlue", 0xFF87CEFA }, | |
{ "LightSlateGray", 0xFF778899 }, | |
{ "LightSteelBlue", 0xFFB0C4DE }, | |
{ "LightYellow", 0xFFFFFFE0 }, | |
{ "Lime", 0xFF00FF00 }, | |
{ "LimeGreen", 0xFF32CD32 }, | |
{ "Linen", 0xFFFAF0E6 }, | |
{ "Magenta", 0xFFFF00FF }, | |
{ "Maroon", 0xFF800000 }, | |
{ "MediumAquaMarine", 0xFF66CDAA }, | |
{ "MediumBlue", 0xFF0000CD }, | |
{ "MediumOrchid", 0xFFBA55D3 }, | |
{ "MediumPurple", 0xFF9370D8 }, | |
{ "MediumSeaGreen", 0xFF3CB371 }, | |
{ "MediumSlateBlue", 0xFF7B68EE }, | |
{ "MediumSpringGreen", 0xFF00FA9A }, | |
{ "MediumTurquoise", 0xFF48D1CC }, | |
{ "MediumVioletRed", 0xFFC71585 }, | |
{ "MidnightBlue", 0xFF191970 }, | |
{ "MintCream", 0xFFF5FFFA }, | |
{ "MistyRose", 0xFFFFE4E1 }, | |
{ "Moccasin", 0xFFFFE4B5 }, | |
{ "NavajoWhite", 0xFFFFDEAD }, | |
{ "Navy", 0xFF000080 }, | |
{ "None", 0x00000000 }, | |
{ "OldLace", 0xFFFDF5E6 }, | |
{ "Olive", 0xFF808000 }, | |
{ "OliveDrab", 0xFF6B8E23 }, | |
{ "Orange", 0xFFFFA500 }, | |
{ "OrangeRed", 0xFFFF4500 }, | |
{ "Orchid", 0xFFDA70D6 }, | |
{ "PaleGoldenRod", 0xFFEEE8AA }, | |
{ "PaleGreen", 0xFF98FB98 }, | |
{ "PaleTurquoise", 0xFFAFEEEE }, | |
{ "PaleVioletRed", 0xFFD87093 }, | |
{ "PapayaWhip", 0xFFFFEFD5 }, | |
{ "PeachPuff", 0xFFFFDAB9 }, | |
{ "Peru", 0xFFCD853F }, | |
{ "Pink", 0xFFFFC0CB }, | |
{ "Plum", 0xFFDDA0DD }, | |
{ "PowderBlue", 0xFFB0E0E6 }, | |
{ "Purple", 0xFF800080 }, | |
{ "Red", 0xFFFF0000 }, | |
{ "RosyBrown", 0xFFBC8F8F }, | |
{ "RoyalBlue", 0xFF4169E1 }, | |
{ "SaddleBrown", 0xFF8B4513 }, | |
{ "Salmon", 0xFFFA8072 }, | |
{ "SandyBrown", 0xFFF4A460 }, | |
{ "SeaGreen", 0xFF2E8B57 }, | |
{ "SeaShell", 0xFFFFF5EE }, | |
{ "Sienna", 0xFFA0522D }, | |
{ "Silver", 0xFFC0C0C0 }, | |
{ "SkyBlue", 0xFF87CEEB }, | |
{ "SlateBlue", 0xFF6A5ACD }, | |
{ "SlateGray", 0xFF708090 }, | |
{ "Snow", 0xFFFFFAFA }, | |
{ "SpringGreen", 0xFF00FF7F }, | |
{ "SteelBlue", 0xFF4682B4 }, | |
{ "Tan", 0xFFD2B48C }, | |
{ "Teal", 0xFF008080 }, | |
{ "Thistle", 0xFFD8BFD8 }, | |
{ "Tomato", 0xFFFF6347 }, | |
{ "Turquoise", 0xFF40E0D0 }, | |
{ "Violet", 0xFFEE82EE }, | |
{ "Wheat", 0xFFF5DEB3 }, | |
{ "White", 0xFFFFFFFF }, | |
{ "WhiteSmoke", 0xFFF5F5F5 }, | |
{ "Yellow", 0xFFFFFF00 }, | |
{ "YellowGreen", 0xFF9ACD32 } | |
}; | |
static int convert(uint8_t x) | |
{ | |
if (x >= 'a') { | |
x -= 87; | |
} else if (x >= 'A') { | |
x -= 55; | |
} else { | |
x -= '0'; | |
} | |
return x; | |
} | |
/* | |
** functions same as strcspn but ignores characters in reject if they are inside a C style comment... | |
** @param string, reject - same as that of strcspn | |
** @return length till any character in reject does not occur in string | |
*/ | |
static size_t mod_strcspn(const char *string, const char *reject) | |
{ | |
int i, j; | |
for (i = 0; string && string[i]; i++) { | |
if (string[i] == '/' && string[i+1] == '*') { | |
i += 2; | |
while ( string && string[i] && (string[i] != '*' || string[i+1] != '/') ) | |
i++; | |
i++; | |
} else if (string[i] == '/' && string[i+1] == '/') { | |
i += 2; | |
while ( string && string[i] && string[i] != '\n' ) | |
i++; | |
} else { | |
for (j = 0; reject && reject[j]; j++) { | |
if (string[i] == reject[j]) | |
break; | |
} | |
if (reject && reject[j]) | |
break; | |
} | |
} | |
return i; | |
} | |
static uint32_t hexstring_to_rgba(const char *p, int len) | |
{ | |
uint32_t ret = 0xFF000000; | |
const ColorEntry *entry; | |
char color_name[100]; | |
if (*p == '#') { | |
p++; | |
len--; | |
if (len == 3) { | |
ret |= (convert(p[2]) << 4) | | |
(convert(p[1]) << 12) | | |
(convert(p[0]) << 20); | |
} else if (len == 4) { | |
ret = (convert(p[3]) << 4) | | |
(convert(p[2]) << 12) | | |
(convert(p[1]) << 20) | | |
(convert(p[0]) << 28); | |
} else if (len == 6) { | |
ret |= convert(p[5]) | | |
(convert(p[4]) << 4) | | |
(convert(p[3]) << 8) | | |
(convert(p[2]) << 12) | | |
(convert(p[1]) << 16) | | |
(convert(p[0]) << 20); | |
} else if (len == 8) { | |
ret = convert(p[7]) | | |
(convert(p[6]) << 4) | | |
(convert(p[5]) << 8) | | |
(convert(p[4]) << 12) | | |
(convert(p[3]) << 16) | | |
(convert(p[2]) << 20) | | |
(convert(p[1]) << 24) | | |
(convert(p[0]) << 28); | |
} | |
} else { | |
strncpy(color_name, p, len); | |
color_name[len] = '\0'; | |
entry = bsearch(color_name, | |
color_table, | |
(sizeof(color_table)/sizeof(color_table[0])), | |
sizeof(ColorEntry), | |
color_table_compare); | |
if (!entry) | |
return ret; | |
ret = entry->rgb_color; | |
} | |
return ret; | |
} | |
static int ascii2index(const uint8_t *cpixel, int cpp) | |
{ | |
const uint8_t *p = cpixel; | |
int n = 0, m = 1, i; | |
for (i = 0; i < cpp; i++) { | |
if (*p < ' ' || *p > '~') | |
return AVERROR_INVALIDDATA; | |
n += (*p++ - ' ') * m; | |
m *= 95; | |
} | |
return n; | |
} | |
static int xpm_decode_frame(AVCodecContext *avctx, void *data, | |
int *got_frame, AVPacket *avpkt) | |
{ | |
XPMDecContext *x = avctx->priv_data; | |
AVFrame *p=data; | |
const uint8_t *end, *ptr = avpkt->data; | |
int ncolors, cpp, ret, i, j; | |
int64_t size; | |
uint32_t *dst; | |
avctx->pix_fmt = AV_PIX_FMT_BGRA; | |
end = avpkt->data + avpkt->size; | |
if (memcmp(ptr, "/* XPM */", 9)) { | |
av_log(avctx, AV_LOG_ERROR, "missing signature\n"); | |
return AVERROR_INVALIDDATA; | |
} | |
ptr += mod_strcspn(ptr, "\""); | |
if (sscanf(ptr, "\"%u %u %u %u\",", | |
&avctx->width, &avctx->height, &ncolors, &cpp) != 4) { | |
av_log(avctx, AV_LOG_ERROR, "missing image parameters\n"); | |
return AVERROR_INVALIDDATA; | |
} | |
if ((ret = ff_set_dimensions(avctx, avctx->width, avctx->height)) < 0) | |
return ret; | |
if ((ret = ff_get_buffer(avctx, p, 0)) < 0) | |
return ret; | |
if (ncolors <= 0) { | |
av_log(avctx, AV_LOG_ERROR, "invalid number of colors: %d\n", ncolors); | |
return AVERROR_INVALIDDATA; | |
} | |
if (cpp <= 0) { | |
av_log(avctx, AV_LOG_ERROR, "invalid number of chars per pixel: %d\n", cpp); | |
return AVERROR_INVALIDDATA; | |
} | |
size = 1; | |
j = 1; | |
for (i = 0; i < cpp; i++) { | |
size += j*94; | |
j *= 95; | |
} | |
size *= 4; | |
if (size < 0) { | |
av_log(avctx, AV_LOG_ERROR, "unsupported number of chars per pixel: %d\n", cpp); | |
return AVERROR(ENOMEM); | |
} | |
av_fast_padded_malloc(&x->pixels, &x->pixels_size, size); | |
if ( !x->pixels ) { | |
return AVERROR(ENOMEM); | |
} | |
ptr += mod_strcspn(ptr, ",") + 1; | |
for (i = 0; i < ncolors; i++) { | |
const uint8_t *index; | |
int len; | |
ptr += mod_strcspn(ptr, "\"") + 1; | |
if (ptr + cpp > end) | |
return AVERROR_INVALIDDATA; | |
index = ptr; | |
ptr += cpp; | |
ptr = strstr(ptr, "c "); | |
if (ptr) { | |
ptr += 2; | |
} else { | |
return AVERROR_INVALIDDATA; | |
} | |
len = strcspn(ptr, "\" "); | |
if ((ret = ascii2index(index, cpp)) < 0) | |
return ret; | |
x->pixels[ret] = hexstring_to_rgba(ptr, len); | |
ptr += mod_strcspn(ptr, ",") + 1; | |
} | |
for (i = 0; i < avctx->height; i++) { | |
dst = (uint32_t *)(p->data[0] + i * p->linesize[0]); | |
ptr += mod_strcspn(ptr, "\"") + 1; | |
for (j = 0; j < avctx->width; j++) { | |
if (ptr + cpp > end) | |
return AVERROR_INVALIDDATA; | |
if ((ret = ascii2index(ptr, cpp)) < 0) | |
return ret; | |
*dst++ = x->pixels[ret]; | |
ptr += cpp; | |
} | |
ptr += mod_strcspn(ptr, ",") + 1; | |
} | |
p->key_frame = 1; | |
p->pict_type = AV_PICTURE_TYPE_I; | |
*got_frame = 1; | |
return avpkt->size; | |
} | |
static av_cold int xpm_decode_close(AVCodecContext *avctx) | |
{ | |
XPMDecContext *x = avctx->priv_data; | |
av_freep(&x->pixels); | |
return 0; | |
} | |
AVCodec ff_xpm_decoder = { | |
.name = "xpm", | |
.type = AVMEDIA_TYPE_VIDEO, | |
.id = AV_CODEC_ID_XPM, | |
.priv_data_size = sizeof(XPMDecContext), | |
.close = xpm_decode_close, | |
.decode = xpm_decode_frame, | |
.capabilities = CODEC_CAP_DR1, | |
.long_name = NULL_IF_CONFIG_SMALL("XPM (X PixMap) image") | |
}; |
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