path: root/libavcodec/htmlsubtitles.c (plain)
blob: 8b57febd26384c1c77585cbbec666ee35e764088

1	/*
2	* Copyright (c) 2010 Aurelien Jacobs <aurel@gnuage.org>
3	*
4	* This file is part of FFmpeg.
5	*
6	* FFmpeg is free software; you can redistribute it and/or
7	* modify it under the terms of the GNU Lesser General Public
8	* License as published by the Free Software Foundation; either
9	* version 2.1 of the License, or (at your option) any later version.
10	*
11	* FFmpeg is distributed in the hope that it will be useful,
12	* but WITHOUT ANY WARRANTY; without even the implied warranty of
13	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14	* Lesser General Public License for more details.
15	*
16	* You should have received a copy of the GNU Lesser General Public
17	* License along with FFmpeg; if not, write to the Free Software
18	* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19	*/
20
21	#include "libavutil/avstring.h"
22	#include "libavutil/common.h"
23	#include "libavutil/parseutils.h"
24	#include "htmlsubtitles.h"
25
26	static int html_color_parse(void *log_ctx, const char *str)
27	{
28	uint8_t rgba[4];
29	if (av_parse_color(rgba, str, strcspn(str, "\" >"), log_ctx) < 0)
30	return -1;
31	return rgba[0] | rgba[1] << 8 | rgba[2] << 16;
32	}
33
34	enum {
35	PARAM_UNKNOWN = -1,
36	PARAM_SIZE,
37	PARAM_COLOR,
38	PARAM_FACE,
39	PARAM_NUMBER
40	};
41
42	typedef struct SrtStack {
43	char tag[128];
44	char param[PARAM_NUMBER][128];
45	} SrtStack;
46
47	static void rstrip_spaces_buf(AVBPrint *buf)
48	{
49	while (buf->len > 0 && buf->str[buf->len - 1] == ' ')
50	buf->str[--buf->len] = 0;
51	}
52
53	void ff_htmlmarkup_to_ass(void *log_ctx, AVBPrint *dst, const char *in)
54	{
55	char *param, buffer[128], tmp[128];
56	int len, tag_close, sptr = 1, line_start = 1, an = 0, end = 0;
57	SrtStack stack[16];
58
59	stack[0].tag[0] = 0;
60	strcpy(stack[0].param[PARAM_SIZE], "{\\fs}");
61	strcpy(stack[0].param[PARAM_COLOR], "{\\c}");
62	strcpy(stack[0].param[PARAM_FACE], "{\\fn}");
63
64	for (; !end && *in; in++) {
65	switch (*in) {
66	case '\r':
67	break;
68	case '\n':
69	if (line_start) {
70	end = 1;
71	break;
72	}
73	rstrip_spaces_buf(dst);
74	av_bprintf(dst, "\\N");
75	line_start = 1;
76	break;
77	case ' ':
78	if (!line_start)
79	av_bprint_chars(dst, *in, 1);
80	break;
81	case '{': /* skip all {\xxx} substrings except for {\an%d}
82	and all microdvd like styles such as {Y:xxx} */
83	len = 0;
84	an += sscanf(in, "{\\an%*1u}%n", &len) >= 0 && len > 0;
85	if ((an != 1 && (len = 0, sscanf(in, "{\\%*[^}]}%n", &len) >= 0 && len > 0)) ||
86	(len = 0, sscanf(in, "{%*1[CcFfoPSsYy]:%*[^}]}%n", &len) >= 0 && len > 0)) {
87	in += len - 1;
88	} else
89	av_bprint_chars(dst, *in, 1);
90	break;
91	case '<':
92	tag_close = in[1] == '/';
93	len = 0;
94	if (sscanf(in+tag_close+1, "%127[^>]>%n", buffer, &len) >= 1 && len > 0) {
95	const char *tagname = buffer;
96	while (*tagname == ' ')
97	tagname++;
98	if ((param = strchr(tagname, ' ')))
99	*param++ = 0;
100	if ((!tag_close && sptr < FF_ARRAY_ELEMS(stack)) ||
101	( tag_close && sptr > 0 && !strcmp(stack[sptr-1].tag, tagname))) {
102	int i, j, unknown = 0;
103	in += len + tag_close;
104	if (!tag_close)
105	memset(stack+sptr, 0, sizeof(*stack));
106	if (!strcmp(tagname, "font")) {
107	if (tag_close) {
108	for (i=PARAM_NUMBER-1; i>=0; i--)
109	if (stack[sptr-1].param[i][0])
110	for (j=sptr-2; j>=0; j--)
111	if (stack[j].param[i][0]) {
112	av_bprintf(dst, "%s", stack[j].param[i]);
113	break;
114	}
115	} else {
116	while (param) {
117	if (!strncmp(param, "size=", 5)) {
118	unsigned font_size;
119	param += 5 + (param[5] == '"');
120	if (sscanf(param, "%u", &font_size) == 1) {
121	snprintf(stack[sptr].param[PARAM_SIZE],
122	sizeof(stack[0].param[PARAM_SIZE]),
123	"{\\fs%u}", font_size);
124	}
125	} else if (!strncmp(param, "color=", 6)) {
126	param += 6 + (param[6] == '"');
127	snprintf(stack[sptr].param[PARAM_COLOR],
128	sizeof(stack[0].param[PARAM_COLOR]),
129	"{\\c&H%X&}",
130	html_color_parse(log_ctx, param));
131	} else if (!strncmp(param, "face=", 5)) {
132	param += 5 + (param[5] == '"');
133	len = strcspn(param,
134	param[-1] == '"' ? "\"" :" ");
135	av_strlcpy(tmp, param,
136	FFMIN(sizeof(tmp), len+1));
137	param += len;
138	snprintf(stack[sptr].param[PARAM_FACE],
139	sizeof(stack[0].param[PARAM_FACE]),
140	"{\\fn%s}", tmp);
141	}
142	if ((param = strchr(param, ' ')))
143	param++;
144	}
145	for (i=0; i<PARAM_NUMBER; i++)
146	if (stack[sptr].param[i][0])
147	av_bprintf(dst, "%s", stack[sptr].param[i]);
148	}
149	} else if (tagname[0] && !tagname[1] && strspn(tagname, "bisu") == 1) {
150	av_bprintf(dst, "{\\%c%d}", tagname[0], !tag_close);
151	} else {
152	unknown = 1;
153	snprintf(tmp, sizeof(tmp), "</%s>", tagname);
154	}
155	if (tag_close) {
156	sptr--;
157	} else if (unknown && !strstr(in, tmp)) {
158	in -= len + tag_close;
159	av_bprint_chars(dst, *in, 1);
160	} else
161	av_strlcpy(stack[sptr++].tag, tagname,
162	sizeof(stack[0].tag));
163	break;
164	}
165	}
166	default:
167	av_bprint_chars(dst, *in, 1);
168	break;
169	}
170	if (*in != ' ' && *in != '\r' && *in != '\n')
171	line_start = 0;
172	}
173
174	while (dst->len >= 2 && !strncmp(&dst->str[dst->len - 2], "\\N", 2))
175	dst->len -= 2;
176	dst->str[dst->len] = 0;
177	rstrip_spaces_buf(dst);
178	}
179