2 * SubRip subtitle decoder
3 * Copyright (c) 2010 Aurelien Jacobs <aurel@gnuage.org>
5 * This file is part of FFmpeg.
7 * FFmpeg is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2.1 of the License, or (at your option) any later version.
12 * FFmpeg is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with FFmpeg; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
22 #include "libavutil/avstring.h"
23 #include "libavutil/common.h"
24 #include "libavutil/intreadwrite.h"
25 #include "libavutil/parseutils.h"
29 static int html_color_parse(AVCodecContext *avctx, const char *str)
32 if (av_parse_color(rgba, str, strcspn(str, "\" >"), avctx) < 0)
34 return rgba[0] | rgba[1] << 8 | rgba[2] << 16;
47 char param[PARAM_NUMBER][128];
50 static const char *srt_to_ass(AVCodecContext *avctx, char *out, char *out_end,
51 const char *in, int x1, int y1, int x2, int y2)
53 char *param, buffer[128], tmp[128];
54 int len, tag_close, sptr = 1, line_start = 1, an = 0, end = 0;
58 strcpy(stack[0].param[PARAM_SIZE], "{\\fs}");
59 strcpy(stack[0].param[PARAM_COLOR], "{\\c}");
60 strcpy(stack[0].param[PARAM_FACE], "{\\fn}");
62 if (x1 >= 0 && y1 >= 0) {
63 if (x2 >= 0 && y2 >= 0 && (x2 != x1 || y2 != y1))
64 snprintf(out, out_end-out,
65 "{\\an1}{\\move(%d,%d,%d,%d)}", x1, y1, x2, y2);
67 snprintf(out, out_end-out, "{\\an1}{\\pos(%d,%d)}", x1, y1);
71 for (; out < out_end && !end && *in; in++) {
80 while (out[-1] == ' ')
82 snprintf(out, out_end-out, "\\N");
83 if(out<out_end) out += strlen(out);
90 case '{': /* skip all {\xxx} substrings except for {\an%d}
91 and all microdvd like styles such as {Y:xxx} */
93 an += sscanf(in, "{\\an%*1u}%n", &len) >= 0 && len > 0;
94 if ((an != 1 && (len = 0, sscanf(in, "{\\%*[^}]}%n", &len) >= 0 && len > 0)) ||
95 (len = 0, sscanf(in, "{%*1[CcFfoPSsYy]:%*[^}]}%n", &len) >= 0 && len > 0)) {
101 tag_close = in[1] == '/';
103 if (sscanf(in+tag_close+1, "%127[^>]>%n", buffer, &len) >= 1 && len > 0) {
104 if ((param = strchr(buffer, ' ')))
106 if ((!tag_close && sptr < FF_ARRAY_ELEMS(stack)) ||
107 ( tag_close && sptr > 0 && !strcmp(stack[sptr-1].tag, buffer))) {
108 int i, j, unknown = 0;
109 in += len + tag_close;
111 memset(stack+sptr, 0, sizeof(*stack));
112 if (!strcmp(buffer, "font")) {
114 for (i=PARAM_NUMBER-1; i>=0; i--)
115 if (stack[sptr-1].param[i][0])
116 for (j=sptr-2; j>=0; j--)
117 if (stack[j].param[i][0]) {
118 snprintf(out, out_end-out,
119 "%s", stack[j].param[i]);
120 if(out<out_end) out += strlen(out);
125 if (!strncmp(param, "size=", 5)) {
127 param += 5 + (param[5] == '"');
128 if (sscanf(param, "%u", &font_size) == 1) {
129 snprintf(stack[sptr].param[PARAM_SIZE],
130 sizeof(stack[0].param[PARAM_SIZE]),
131 "{\\fs%u}", font_size);
133 } else if (!strncmp(param, "color=", 6)) {
134 param += 6 + (param[6] == '"');
135 snprintf(stack[sptr].param[PARAM_COLOR],
136 sizeof(stack[0].param[PARAM_COLOR]),
138 html_color_parse(avctx, param));
139 } else if (!strncmp(param, "face=", 5)) {
140 param += 5 + (param[5] == '"');
142 param[-1] == '"' ? "\"" :" ");
143 av_strlcpy(tmp, param,
144 FFMIN(sizeof(tmp), len+1));
146 snprintf(stack[sptr].param[PARAM_FACE],
147 sizeof(stack[0].param[PARAM_FACE]),
150 if ((param = strchr(param, ' ')))
153 for (i=0; i<PARAM_NUMBER; i++)
154 if (stack[sptr].param[i][0]) {
155 snprintf(out, out_end-out,
156 "%s", stack[sptr].param[i]);
157 if(out<out_end) out += strlen(out);
160 } else if (!buffer[1] && strspn(buffer, "bisu") == 1) {
161 snprintf(out, out_end-out,
162 "{\\%c%d}", buffer[0], !tag_close);
163 if(out<out_end) out += strlen(out);
166 snprintf(tmp, sizeof(tmp), "</%s>", buffer);
170 } else if (unknown && !strstr(in, tmp)) {
171 in -= len + tag_close;
174 av_strlcpy(stack[sptr++].tag, buffer,
175 sizeof(stack[0].tag));
183 if (*in != ' ' && *in != '\r' && *in != '\n')
187 out = FFMIN(out, out_end-3);
188 while (!strncmp(out-2, "\\N", 2))
190 while (out[-1] == ' ')
192 snprintf(out, out_end-out, "\r\n");
196 static const char *read_ts(const char *buf, int *ts_start, int *ts_end,
197 int *x1, int *y1, int *x2, int *y2)
199 int i, hs, ms, ss, he, me, se;
201 for (i=0; i<2; i++) {
202 /* try to read timestamps in either the first or second line */
203 int c = sscanf(buf, "%d:%2d:%2d%*1[,.]%3d --> %d:%2d:%2d%*1[,.]%3d"
204 "%*[ ]X1:%u X2:%u Y1:%u Y2:%u",
205 &hs, &ms, &ss, ts_start, &he, &me, &se, ts_end,
207 buf += strcspn(buf, "\n") + 1;
209 *ts_start = 100*(ss + 60*(ms + 60*hs)) + *ts_start/10;
210 *ts_end = 100*(se + 60*(me + 60*he)) + *ts_end /10;
217 static int srt_decode_frame(AVCodecContext *avctx,
218 void *data, int *got_sub_ptr, AVPacket *avpkt)
220 AVSubtitle *sub = data;
221 int ts_start, ts_end, x1 = -1, y1 = -1, x2 = -1, y2 = -1;
223 const char *ptr = avpkt->data;
224 const char *end = avpkt->data + avpkt->size;
226 const uint8_t *p = av_packet_get_side_data(avpkt, AV_PKT_DATA_SUBTITLE_POSITION, &size);
228 if (p && size == 16) {
232 y2 = AV_RL32(p + 12);
235 if (avpkt->size <= 0)
238 while (ptr < end && *ptr) {
239 if (avctx->codec->id == AV_CODEC_ID_SRT) {
240 ptr = read_ts(ptr, &ts_start, &ts_end, &x1, &y1, &x2, &y2);
244 // Do final divide-by-10 outside rescale to force rounding down.
245 ts_start = av_rescale_q(avpkt->pts,
247 (AVRational){1,100});
248 ts_end = av_rescale_q(avpkt->pts + avpkt->duration,
250 (AVRational){1,100});
252 ptr = srt_to_ass(avctx, buffer, buffer+sizeof(buffer), ptr,
254 ff_ass_add_rect(sub, buffer, ts_start, ts_end-ts_start, 0);
257 *got_sub_ptr = sub->num_rects > 0;
261 #if CONFIG_SRT_DECODER
262 /* deprecated decoder */
263 AVCodec ff_srt_decoder = {
265 .long_name = NULL_IF_CONFIG_SMALL("SubRip subtitle with embedded timing"),
266 .type = AVMEDIA_TYPE_SUBTITLE,
267 .id = AV_CODEC_ID_SRT,
268 .init = ff_ass_subtitle_header_default,
269 .decode = srt_decode_frame,
273 #if CONFIG_SUBRIP_DECODER
274 AVCodec ff_subrip_decoder = {
276 .long_name = NULL_IF_CONFIG_SMALL("SubRip subtitle"),
277 .type = AVMEDIA_TYPE_SUBTITLE,
278 .id = AV_CODEC_ID_SUBRIP,
279 .init = ff_ass_subtitle_header_default,
280 .decode = srt_decode_frame,