| /* | |
| * Copyright (c) 2010 Aurelien Jacobs <aurel@gnuage.org> | |
| * Copyright (c) 2017 Clément Bœsch <u@pkh.me> | |
| * | |
| * 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/avassert.h" | |
| #include "libavutil/avstring.h" | |
| #include "libavutil/common.h" | |
| #include "libavutil/parseutils.h" | |
| #include "htmlsubtitles.h" | |
| #include <ctype.h> | |
| static int html_color_parse(void *log_ctx, const char *str) | |
| { | |
| uint8_t rgba[4]; | |
| int nb_sharps = 0; | |
| while (str[nb_sharps] == '#') | |
| nb_sharps++; | |
| str += FFMAX(0, nb_sharps - 1); | |
| if (av_parse_color(rgba, str, strcspn(str, "\" >"), log_ctx) < 0) | |
| return -1; | |
| return rgba[0] | rgba[1] << 8 | rgba[2] << 16; | |
| } | |
| static void rstrip_spaces_buf(AVBPrint *buf) | |
| { | |
| if (av_bprint_is_complete(buf)) | |
| while (buf->len > 0 && buf->str[buf->len - 1] == ' ') | |
| buf->str[--buf->len] = 0; | |
| } | |
| /* | |
| * Fast code for scanning text enclosed in braces. Functionally | |
| * equivalent to this sscanf call: | |
| * | |
| * sscanf(in, "{\\an%*1u}%n", &len) >= 0 && len > 0 | |
| */ | |
| static int scanbraces(const char* in) { | |
| if (strncmp(in, "{\\an", 4) != 0) { | |
| return 0; | |
| } | |
| if (!av_isdigit(in[4])) { | |
| return 0; | |
| } | |
| if (in[5] != '}') { | |
| return 0; | |
| } | |
| return 1; | |
| } | |
| /* skip all {\xxx} substrings except for {\an%d} | |
| and all microdvd like styles such as {Y:xxx} */ | |
| static void handle_open_brace(AVBPrint *dst, const char **inp, int *an, int *closing_brace_missing) | |
| { | |
| const char *in = *inp; | |
| *an += scanbraces(in); | |
| if (!*closing_brace_missing) { | |
| if ( (*an != 1 && in[1] == '\\') | |
| || (in[1] && strchr("CcFfoPSsYy", in[1]) && in[2] == ':')) { | |
| char *bracep = strchr(in+2, '}'); | |
| if (bracep) { | |
| *inp = bracep; | |
| return; | |
| } else | |
| *closing_brace_missing = 1; | |
| } | |
| } | |
| av_bprint_chars(dst, *in, 1); | |
| } | |
| struct font_tag { | |
| char face[128]; | |
| int size; | |
| uint32_t color; | |
| }; | |
| /* | |
| * Fast code for scanning the rest of a tag. Functionally equivalent to | |
| * this sscanf call: | |
| * | |
| * sscanf(in, "%127[^<>]>%n", buffer, lenp) == 2 | |
| */ | |
| static int scantag(const char* in, char* buffer, int* lenp) { | |
| int len; | |
| for (len = 0; len < 128; len++) { | |
| const char c = *in++; | |
| switch (c) { | |
| case '\0': | |
| return 0; | |
| case '<': | |
| return 0; | |
| case '>': | |
| buffer[len] = '\0'; | |
| *lenp = len+1; | |
| return 1; | |
| default: | |
| break; | |
| } | |
| buffer[len] = c; | |
| } | |
| return 0; | |
| } | |
| /* | |
| * The general politic of the convert is to mask unsupported tags or formatting | |
| * errors (but still alert the user/subtitles writer with an error/warning) | |
| * without dropping any actual text content for the final user. | |
| */ | |
| int ff_htmlmarkup_to_ass(void *log_ctx, AVBPrint *dst, const char *in) | |
| { | |
| char *param, buffer[128]; | |
| int len, tag_close, sptr = 0, line_start = 1, an = 0, end = 0; | |
| int closing_brace_missing = 0; | |
| int i, likely_a_tag; | |
| /* | |
| * state stack is only present for fonts since they are the only tags where | |
| * the state is not binary. Here is a typical use case: | |
| * | |
| * <font color="red" size=10> | |
| * red 10 | |
| * <font size=50> RED AND BIG </font> | |
| * red 10 again | |
| * </font> | |
| * | |
| * On the other hand, using the state system for all the tags should be | |
| * avoided because it breaks wrongly nested tags such as: | |
| * | |
| * <b> foo <i> bar </b> bla </i> | |
| * | |
| * We don't want to break here; instead, we will treat all these tags as | |
| * binary state markers. Basically, "<b>" will activate bold, and "</b>" | |
| * will deactivate it, whatever the current state. | |
| * | |
| * This will also prevents cases where we have a random closing tag | |
| * remaining after the opening one was dropped. Yes, this happens and we | |
| * still don't want to print a "</b>" at the end of the dialog event. | |
| */ | |
| struct font_tag stack[16]; | |
| memset(&stack[0], 0, sizeof(stack[0])); | |
| for (; !end && *in; in++) { | |
| switch (*in) { | |
| case '\r': | |
| break; | |
| case '\n': | |
| if (line_start) { | |
| end = 1; | |
| break; | |
| } | |
| rstrip_spaces_buf(dst); | |
| av_bprintf(dst, "\\N"); | |
| line_start = 1; | |
| break; | |
| case ' ': | |
| if (!line_start) | |
| av_bprint_chars(dst, *in, 1); | |
| break; | |
| case '{': | |
| handle_open_brace(dst, &in, &an, &closing_brace_missing); | |
| break; | |
| case '<': | |
| /* | |
| * "<<" are likely latin guillemets in ASCII or some kind of random | |
| * style effect; see sub/badsyntax.srt in the FATE samples | |
| * directory for real test cases. | |
| */ | |
| likely_a_tag = 1; | |
| for (i = 0; in[1] == '<'; i++) { | |
| av_bprint_chars(dst, '<', 1); | |
| likely_a_tag = 0; | |
| in++; | |
| } | |
| tag_close = in[1] == '/'; | |
| if (tag_close) | |
| likely_a_tag = 1; | |
| av_assert0(in[0] == '<'); | |
| len = 0; | |
| if (scantag(in+tag_close+1, buffer, &len) && len > 0) { | |
| const int skip = len + tag_close; | |
| const char *tagname = buffer; | |
| while (*tagname == ' ') { | |
| likely_a_tag = 0; | |
| tagname++; | |
| } | |
| if ((param = strchr(tagname, ' '))) | |
| *param++ = 0; | |
| /* Check if this is likely a tag */ | |
| #define LIKELY_A_TAG_CHAR(x) (((x) >= '0' && (x) <= '9') || \ | |
| ((x) >= 'a' && (x) <= 'z') || \ | |
| ((x) >= 'A' && (x) <= 'Z') || \ | |
| (x) == '_' || (x) == '/') | |
| for (i = 0; tagname[i]; i++) { | |
| if (!LIKELY_A_TAG_CHAR(tagname[i])) { | |
| likely_a_tag = 0; | |
| break; | |
| } | |
| } | |
| if (!av_strcasecmp(tagname, "font")) { | |
| if (tag_close && sptr > 0) { | |
| struct font_tag *cur_tag = &stack[sptr--]; | |
| struct font_tag *last_tag = &stack[sptr]; | |
| if (cur_tag->size) { | |
| if (!last_tag->size) | |
| av_bprintf(dst, "{\\fs}"); | |
| else if (last_tag->size != cur_tag->size) | |
| av_bprintf(dst, "{\\fs%d}", last_tag->size); | |
| } | |
| if (cur_tag->color & 0xff000000) { | |
| if (!(last_tag->color & 0xff000000)) | |
| av_bprintf(dst, "{\\c}"); | |
| else if (last_tag->color != cur_tag->color) | |
| av_bprintf(dst, "{\\c&H%"PRIX32"&}", last_tag->color & 0xffffff); | |
| } | |
| if (cur_tag->face[0]) { | |
| if (!last_tag->face[0]) | |
| av_bprintf(dst, "{\\fn}"); | |
| else if (strcmp(last_tag->face, cur_tag->face)) | |
| av_bprintf(dst, "{\\fn%s}", last_tag->face); | |
| } | |
| } else if (!tag_close && sptr < FF_ARRAY_ELEMS(stack) - 1) { | |
| struct font_tag *new_tag = &stack[sptr + 1]; | |
| *new_tag = stack[sptr++]; | |
| while (param) { | |
| if (!av_strncasecmp(param, "size=", 5)) { | |
| param += 5 + (param[5] == '"'); | |
| if (sscanf(param, "%u", &new_tag->size) == 1) | |
| av_bprintf(dst, "{\\fs%u}", new_tag->size); | |
| } else if (!av_strncasecmp(param, "color=", 6)) { | |
| int color; | |
| param += 6 + (param[6] == '"'); | |
| color = html_color_parse(log_ctx, param); | |
| if (color >= 0) { | |
| new_tag->color = 0xff000000 | color; | |
| av_bprintf(dst, "{\\c&H%"PRIX32"&}", new_tag->color & 0xffffff); | |
| } | |
| } else if (!av_strncasecmp(param, "face=", 5)) { | |
| param += 5 + (param[5] == '"'); | |
| len = strcspn(param, | |
| param[-1] == '"' ? "\"" :" "); | |
| av_strlcpy(new_tag->face, param, | |
| FFMIN(sizeof(new_tag->face), len+1)); | |
| param += len; | |
| av_bprintf(dst, "{\\fn%s}", new_tag->face); | |
| } | |
| if ((param = strchr(param, ' '))) | |
| param++; | |
| } | |
| } | |
| in += skip; | |
| } else if (tagname[0] && !tagname[1] && strchr("bisu", av_tolower(tagname[0]))) { | |
| av_bprintf(dst, "{\\%c%d}", (char)av_tolower(tagname[0]), !tag_close); | |
| in += skip; | |
| } else if (!av_strncasecmp(tagname, "br", 2) && | |
| (!tagname[2] || (tagname[2] == '/' && !tagname[3]))) { | |
| av_bprintf(dst, "\\N"); | |
| in += skip; | |
| } else if (likely_a_tag) { | |
| if (!tag_close) // warn only once | |
| av_log(log_ctx, AV_LOG_WARNING, "Unrecognized tag %s\n", tagname); | |
| in += skip; | |
| } else { | |
| av_bprint_chars(dst, '<', 1); | |
| } | |
| } else { | |
| av_bprint_chars(dst, *in, 1); | |
| } | |
| break; | |
| default: | |
| av_bprint_chars(dst, *in, 1); | |
| break; | |
| } | |
| if (*in != ' ' && *in != '\r' && *in != '\n') | |
| line_start = 0; | |
| } | |
| if (!av_bprint_is_complete(dst)) | |
| return AVERROR(ENOMEM); | |
| while (dst->len >= 2 && !strncmp(&dst->str[dst->len - 2], "\\N", 2)) | |
| dst->len -= 2; | |
| dst->str[dst->len] = 0; | |
| rstrip_spaces_buf(dst); | |
| return 0; | |
| } |