| /* |
| * Copyright (c) 2010 Aurelien Jacobs <aurel@gnuage.org> |
| * |
| * 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/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]; |
| if (av_parse_color(rgba, str, strcspn(str, "\" >"), log_ctx) < 0) |
| return -1; |
| return rgba[0] | rgba[1] << 8 | rgba[2] << 16; |
| } |
| |
| enum { |
| PARAM_UNKNOWN = -1, |
| PARAM_SIZE, |
| PARAM_COLOR, |
| PARAM_FACE, |
| PARAM_NUMBER |
| }; |
| |
| typedef struct SrtStack { |
| char tag[128]; |
| char param[PARAM_NUMBER][128]; |
| } SrtStack; |
| |
| 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; |
| } |
| |
| /* |
| * 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; |
| } |
| |
| int ff_htmlmarkup_to_ass(void *log_ctx, AVBPrint *dst, const char *in) |
| { |
| char *param, buffer[128], tmp[128]; |
| int len, tag_close, sptr = 1, line_start = 1, an = 0, end = 0; |
| SrtStack stack[16]; |
| int closing_brace_missing = 0; |
| |
| stack[0].tag[0] = 0; |
| strcpy(stack[0].param[PARAM_SIZE], "{\\fs}"); |
| strcpy(stack[0].param[PARAM_COLOR], "{\\c}"); |
| strcpy(stack[0].param[PARAM_FACE], "{\\fn}"); |
| |
| 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 '{': /* skip all {\xxx} substrings except for {\an%d} |
| and all microdvd like styles such as {Y:xxx} */ |
| 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) { |
| in = bracep; |
| break; |
| } else |
| closing_brace_missing = 1; |
| } |
| } |
| |
| av_bprint_chars(dst, *in, 1); |
| break; |
| case '<': |
| tag_close = in[1] == '/'; |
| len = 0; |
| if (scantag(in+tag_close+1, buffer, &len) && len > 0) { |
| const char *tagname = buffer; |
| while (*tagname == ' ') |
| tagname++; |
| if ((param = strchr(tagname, ' '))) |
| *param++ = 0; |
| if ((!tag_close && sptr < FF_ARRAY_ELEMS(stack) && *tagname) || |
| ( tag_close && sptr > 0 && !strcmp(stack[sptr-1].tag, tagname))) { |
| int i, j, unknown = 0; |
| in += len + tag_close; |
| if (!tag_close) |
| memset(stack+sptr, 0, sizeof(*stack)); |
| if (!strcmp(tagname, "font")) { |
| if (tag_close) { |
| for (i=PARAM_NUMBER-1; i>=0; i--) |
| if (stack[sptr-1].param[i][0]) |
| for (j=sptr-2; j>=0; j--) |
| if (stack[j].param[i][0]) { |
| av_bprintf(dst, "%s", stack[j].param[i]); |
| break; |
| } |
| } else { |
| while (param) { |
| if (!strncmp(param, "size=", 5)) { |
| unsigned font_size; |
| param += 5 + (param[5] == '"'); |
| if (sscanf(param, "%u", &font_size) == 1) { |
| snprintf(stack[sptr].param[PARAM_SIZE], |
| sizeof(stack[0].param[PARAM_SIZE]), |
| "{\\fs%u}", font_size); |
| } |
| } else if (!strncmp(param, "color=", 6)) { |
| param += 6 + (param[6] == '"'); |
| snprintf(stack[sptr].param[PARAM_COLOR], |
| sizeof(stack[0].param[PARAM_COLOR]), |
| "{\\c&H%X&}", |
| html_color_parse(log_ctx, param)); |
| } else if (!strncmp(param, "face=", 5)) { |
| param += 5 + (param[5] == '"'); |
| len = strcspn(param, |
| param[-1] == '"' ? "\"" :" "); |
| av_strlcpy(tmp, param, |
| FFMIN(sizeof(tmp), len+1)); |
| param += len; |
| snprintf(stack[sptr].param[PARAM_FACE], |
| sizeof(stack[0].param[PARAM_FACE]), |
| "{\\fn%s}", tmp); |
| } |
| if ((param = strchr(param, ' '))) |
| param++; |
| } |
| for (i=0; i<PARAM_NUMBER; i++) |
| if (stack[sptr].param[i][0]) |
| av_bprintf(dst, "%s", stack[sptr].param[i]); |
| } |
| } else if (tagname[0] && !tagname[1] && strspn(tagname, "bisu") == 1) { |
| av_bprintf(dst, "{\\%c%d}", tagname[0], !tag_close); |
| } else { |
| unknown = 1; |
| snprintf(tmp, sizeof(tmp), "</%s>", tagname); |
| } |
| if (tag_close) { |
| sptr--; |
| } else if (unknown && !strstr(in, tmp)) { |
| in -= len + tag_close; |
| av_bprint_chars(dst, *in, 1); |
| } else |
| av_strlcpy(stack[sptr++].tag, tagname, |
| sizeof(stack[0].tag)); |
| 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; |
| } |
