libspeex: allow custom sample rates again.
[ffmpeg.git] / libavcodec / srtdec.c
1 /*
2  * SubRip subtitle decoder
3  * Copyright (c) 2010  Aurelien Jacobs <aurel@gnuage.org>
4  *
5  * This file is part of FFmpeg.
6  *
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.
11  *
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.
16  *
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
20  */
21
22 #include "libavutil/avstring.h"
23 #include "libavutil/common.h"
24 #include "libavutil/intreadwrite.h"
25 #include "libavutil/parseutils.h"
26 #include "avcodec.h"
27 #include "ass.h"
28
29 static int html_color_parse(AVCodecContext *avctx, const char *str)
30 {
31     uint8_t rgba[4];
32     if (av_parse_color(rgba, str, strcspn(str, "\" >"), avctx) < 0)
33         return -1;
34     return rgba[0] | rgba[1] << 8 | rgba[2] << 16;
35 }
36
37 enum {
38     PARAM_UNKNOWN = -1,
39     PARAM_SIZE,
40     PARAM_COLOR,
41     PARAM_FACE,
42     PARAM_NUMBER
43 };
44
45 typedef struct {
46     char tag[128];
47     char param[PARAM_NUMBER][128];
48 } SrtStack;
49
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)
52 {
53     char c, *param, buffer[128], tmp[128];
54     int len, tag_close, sptr = 1, line_start = 1, an = 0, end = 0;
55     SrtStack stack[16];
56
57     stack[0].tag[0] = 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}");
61
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);
66         else
67             snprintf(out, out_end-out, "{\\an1}{\\pos(%d,%d)}", x1, y1);
68         out += strlen(out);
69     }
70
71     for (; out < out_end && !end && *in; in++) {
72         switch (*in) {
73         case '\r':
74             break;
75         case '\n':
76             if (line_start) {
77                 end = 1;
78                 break;
79             }
80             while (out[-1] == ' ')
81                 out--;
82             snprintf(out, out_end-out, "\\N");
83             if(out<out_end) out += strlen(out);
84             line_start = 1;
85             break;
86         case ' ':
87             if (!line_start)
88                 *out++ = *in;
89             break;
90         case '{':    /* skip all {\xxx} substrings except for {\an%d}
91                         and all microdvd like styles such as {Y:xxx} */
92             an += sscanf(in, "{\\an%*1u}%c", &c) == 1;
93             if ((an != 1 && sscanf(in, "{\\%*[^}]}%n%c", &len, &c) > 0) ||
94                 sscanf(in, "{%*1[CcFfoPSsYy]:%*[^}]}%n%c", &len, &c) > 0) {
95                 in += len - 1;
96             } else
97                 *out++ = *in;
98             break;
99         case '<':
100             tag_close = in[1] == '/';
101             if (sscanf(in+tag_close+1, "%127[^>]>%n%c", buffer, &len,&c) >= 2) {
102                 if ((param = strchr(buffer, ' ')))
103                     *param++ = 0;
104                 if ((!tag_close && sptr < FF_ARRAY_ELEMS(stack)) ||
105                     ( tag_close && sptr > 0 && !strcmp(stack[sptr-1].tag, buffer))) {
106                     int i, j, unknown = 0;
107                     in += len + tag_close;
108                     if (!tag_close)
109                         memset(stack+sptr, 0, sizeof(*stack));
110                     if (!strcmp(buffer, "font")) {
111                         if (tag_close) {
112                             for (i=PARAM_NUMBER-1; i>=0; i--)
113                                 if (stack[sptr-1].param[i][0])
114                                     for (j=sptr-2; j>=0; j--)
115                                         if (stack[j].param[i][0]) {
116                                             snprintf(out, out_end-out,
117                                                             "%s", stack[j].param[i]);
118                                             if(out<out_end) out += strlen(out);
119                                             break;
120                                         }
121                         } else {
122                             while (param) {
123                                 if (!strncmp(param, "size=", 5)) {
124                                     unsigned font_size;
125                                     param += 5 + (param[5] == '"');
126                                     if (sscanf(param, "%u", &font_size) == 1) {
127                                         snprintf(stack[sptr].param[PARAM_SIZE],
128                                              sizeof(stack[0].param[PARAM_SIZE]),
129                                              "{\\fs%u}", font_size);
130                                     }
131                                 } else if (!strncmp(param, "color=", 6)) {
132                                     param += 6 + (param[6] == '"');
133                                     snprintf(stack[sptr].param[PARAM_COLOR],
134                                          sizeof(stack[0].param[PARAM_COLOR]),
135                                          "{\\c&H%X&}",
136                                          html_color_parse(avctx, param));
137                                 } else if (!strncmp(param, "face=", 5)) {
138                                     param += 5 + (param[5] == '"');
139                                     len = strcspn(param,
140                                                   param[-1] == '"' ? "\"" :" ");
141                                     av_strlcpy(tmp, param,
142                                                FFMIN(sizeof(tmp), len+1));
143                                     param += len;
144                                     snprintf(stack[sptr].param[PARAM_FACE],
145                                              sizeof(stack[0].param[PARAM_FACE]),
146                                              "{\\fn%s}", tmp);
147                                 }
148                                 if ((param = strchr(param, ' ')))
149                                     param++;
150                             }
151                             for (i=0; i<PARAM_NUMBER; i++)
152                                 if (stack[sptr].param[i][0]) {
153                                     snprintf(out, out_end-out,
154                                                     "%s", stack[sptr].param[i]);
155                                     if(out<out_end) out += strlen(out);
156                                 }
157                         }
158                     } else if (!buffer[1] && strspn(buffer, "bisu") == 1) {
159                         snprintf(out, out_end-out,
160                                         "{\\%c%d}", buffer[0], !tag_close);
161                         if(out<out_end) out += strlen(out);
162                     } else {
163                         unknown = 1;
164                         snprintf(tmp, sizeof(tmp), "</%s>", buffer);
165                     }
166                     if (tag_close) {
167                         sptr--;
168                     } else if (unknown && !strstr(in, tmp)) {
169                         in -= len + tag_close;
170                         *out++ = *in;
171                     } else
172                         av_strlcpy(stack[sptr++].tag, buffer,
173                                    sizeof(stack[0].tag));
174                     break;
175                 }
176             }
177         default:
178             *out++ = *in;
179             break;
180         }
181         if (*in != ' ' && *in != '\r' && *in != '\n')
182             line_start = 0;
183     }
184
185     out = FFMIN(out, out_end-3);
186     while (!strncmp(out-2, "\\N", 2))
187         out -= 2;
188     while (out[-1] == ' ')
189         out--;
190     snprintf(out, out_end-out, "\r\n");
191     return in;
192 }
193
194 static const char *read_ts(const char *buf, int *ts_start, int *ts_end,
195                            int *x1, int *y1, int *x2, int *y2)
196 {
197     int i, hs, ms, ss, he, me, se;
198
199     for (i=0; i<2; i++) {
200         /* try to read timestamps in either the first or second line */
201         int c = sscanf(buf, "%d:%2d:%2d%*1[,.]%3d --> %d:%2d:%2d%*1[,.]%3d"
202                        "%*[ ]X1:%u X2:%u Y1:%u Y2:%u",
203                        &hs, &ms, &ss, ts_start, &he, &me, &se, ts_end,
204                        x1, x2, y1, y2);
205         buf += strcspn(buf, "\n") + 1;
206         if (c >= 8) {
207             *ts_start = 100*(ss + 60*(ms + 60*hs)) + *ts_start/10;
208             *ts_end   = 100*(se + 60*(me + 60*he)) + *ts_end  /10;
209             return buf;
210         }
211     }
212     return NULL;
213 }
214
215 static int srt_decode_frame(AVCodecContext *avctx,
216                             void *data, int *got_sub_ptr, AVPacket *avpkt)
217 {
218     AVSubtitle *sub = data;
219     int ts_start, ts_end, x1 = -1, y1 = -1, x2 = -1, y2 = -1;
220     char buffer[2048];
221     const char *ptr = avpkt->data;
222     const char *end = avpkt->data + avpkt->size;
223     int size;
224     const uint8_t *p = av_packet_get_side_data(avpkt, AV_PKT_DATA_SUBTITLE_POSITION, &size);
225
226     if (p && size == 16) {
227         x1 = AV_RL32(p     );
228         y1 = AV_RL32(p +  4);
229         x2 = AV_RL32(p +  8);
230         y2 = AV_RL32(p + 12);
231     }
232
233     if (avpkt->size <= 0)
234         return avpkt->size;
235
236     while (ptr < end && *ptr) {
237         if (avctx->codec->id == CODEC_ID_SRT) {
238             ptr = read_ts(ptr, &ts_start, &ts_end, &x1, &y1, &x2, &y2);
239             if (!ptr)
240                 break;
241         } else {
242             // Do final divide-by-10 outside rescale to force rounding down.
243             ts_start = av_rescale_q(avpkt->pts,
244                                     avctx->time_base,
245                                     (AVRational){1,100});
246             ts_end   = av_rescale_q(avpkt->pts + avpkt->duration,
247                                     avctx->time_base,
248                                     (AVRational){1,100});
249         }
250         ptr = srt_to_ass(avctx, buffer, buffer+sizeof(buffer), ptr,
251                          x1, y1, x2, y2);
252         ff_ass_add_rect(sub, buffer, ts_start, ts_end-ts_start, 0);
253     }
254
255     *got_sub_ptr = sub->num_rects > 0;
256     return avpkt->size;
257 }
258
259 #if CONFIG_SRT_DECODER
260 /* deprecated decoder */
261 AVCodec ff_srt_decoder = {
262     .name         = "srt",
263     .long_name    = NULL_IF_CONFIG_SMALL("SubRip subtitle with embedded timing"),
264     .type         = AVMEDIA_TYPE_SUBTITLE,
265     .id           = AV_CODEC_ID_SRT,
266     .init         = ff_ass_subtitle_header_default,
267     .decode       = srt_decode_frame,
268 };
269 #endif
270
271 #if CONFIG_SUBRIP_DECODER
272 AVCodec ff_subrip_decoder = {
273     .name         = "subrip",
274     .long_name    = NULL_IF_CONFIG_SMALL("SubRip subtitle"),
275     .type         = AVMEDIA_TYPE_SUBTITLE,
276     .id           = AV_CODEC_ID_SUBRIP,
277     .init         = ff_ass_subtitle_header_default,
278     .decode       = srt_decode_frame,
279 };
280 #endif