Imported Debian version 2.5.3~trusty1
[deb_ffmpeg.git] / ffmpeg / libavcodec / srtdec.c
CommitLineData
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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
29static 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
37enum {
38 PARAM_UNKNOWN = -1,
39 PARAM_SIZE,
40 PARAM_COLOR,
41 PARAM_FACE,
42 PARAM_NUMBER
43};
44
45typedef struct {
46 char tag[128];
47 char param[PARAM_NUMBER][128];
48} SrtStack;
49
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50static void rstrip_spaces_buf(AVBPrint *buf)
51{
52 while (buf->len > 0 && buf->str[buf->len - 1] == ' ')
53 buf->str[--buf->len] = 0;
54}
55
56static void srt_to_ass(AVCodecContext *avctx, AVBPrint *dst,
57 const char *in, int x1, int y1, int x2, int y2)
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58{
59 char *param, buffer[128], tmp[128];
60 int len, tag_close, sptr = 1, line_start = 1, an = 0, end = 0;
61 SrtStack stack[16];
62
63 stack[0].tag[0] = 0;
64 strcpy(stack[0].param[PARAM_SIZE], "{\\fs}");
65 strcpy(stack[0].param[PARAM_COLOR], "{\\c}");
66 strcpy(stack[0].param[PARAM_FACE], "{\\fn}");
67
68 if (x1 >= 0 && y1 >= 0) {
69 if (x2 >= 0 && y2 >= 0 && (x2 != x1 || y2 != y1))
f6fa7814 70 av_bprintf(dst, "{\\an1}{\\move(%d,%d,%d,%d)}", x1, y1, x2, y2);
2ba45a60 71 else
f6fa7814 72 av_bprintf(dst, "{\\an1}{\\pos(%d,%d)}", x1, y1);
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73 }
74
f6fa7814 75 for (; !end && *in; in++) {
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76 switch (*in) {
77 case '\r':
78 break;
79 case '\n':
80 if (line_start) {
81 end = 1;
82 break;
83 }
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84 rstrip_spaces_buf(dst);
85 av_bprintf(dst, "\\N");
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86 line_start = 1;
87 break;
88 case ' ':
89 if (!line_start)
f6fa7814 90 av_bprint_chars(dst, *in, 1);
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91 break;
92 case '{': /* skip all {\xxx} substrings except for {\an%d}
93 and all microdvd like styles such as {Y:xxx} */
94 len = 0;
95 an += sscanf(in, "{\\an%*1u}%n", &len) >= 0 && len > 0;
96 if ((an != 1 && (len = 0, sscanf(in, "{\\%*[^}]}%n", &len) >= 0 && len > 0)) ||
97 (len = 0, sscanf(in, "{%*1[CcFfoPSsYy]:%*[^}]}%n", &len) >= 0 && len > 0)) {
98 in += len - 1;
99 } else
f6fa7814 100 av_bprint_chars(dst, *in, 1);
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101 break;
102 case '<':
103 tag_close = in[1] == '/';
104 len = 0;
105 if (sscanf(in+tag_close+1, "%127[^>]>%n", buffer, &len) >= 1 && len > 0) {
106 if ((param = strchr(buffer, ' ')))
107 *param++ = 0;
108 if ((!tag_close && sptr < FF_ARRAY_ELEMS(stack)) ||
109 ( tag_close && sptr > 0 && !strcmp(stack[sptr-1].tag, buffer))) {
110 int i, j, unknown = 0;
111 in += len + tag_close;
112 if (!tag_close)
113 memset(stack+sptr, 0, sizeof(*stack));
114 if (!strcmp(buffer, "font")) {
115 if (tag_close) {
116 for (i=PARAM_NUMBER-1; i>=0; i--)
117 if (stack[sptr-1].param[i][0])
118 for (j=sptr-2; j>=0; j--)
119 if (stack[j].param[i][0]) {
f6fa7814 120 av_bprintf(dst, "%s", stack[j].param[i]);
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121 break;
122 }
123 } else {
124 while (param) {
125 if (!strncmp(param, "size=", 5)) {
126 unsigned font_size;
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);
132 }
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]),
137 "{\\c&H%X&}",
138 html_color_parse(avctx, param));
139 } else if (!strncmp(param, "face=", 5)) {
140 param += 5 + (param[5] == '"');
141 len = strcspn(param,
142 param[-1] == '"' ? "\"" :" ");
143 av_strlcpy(tmp, param,
144 FFMIN(sizeof(tmp), len+1));
145 param += len;
146 snprintf(stack[sptr].param[PARAM_FACE],
147 sizeof(stack[0].param[PARAM_FACE]),
148 "{\\fn%s}", tmp);
149 }
150 if ((param = strchr(param, ' ')))
151 param++;
152 }
153 for (i=0; i<PARAM_NUMBER; i++)
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154 if (stack[sptr].param[i][0])
155 av_bprintf(dst, "%s", stack[sptr].param[i]);
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156 }
157 } else if (!buffer[1] && strspn(buffer, "bisu") == 1) {
f6fa7814 158 av_bprintf(dst, "{\\%c%d}", buffer[0], !tag_close);
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159 } else {
160 unknown = 1;
161 snprintf(tmp, sizeof(tmp), "</%s>", buffer);
162 }
163 if (tag_close) {
164 sptr--;
165 } else if (unknown && !strstr(in, tmp)) {
166 in -= len + tag_close;
f6fa7814 167 av_bprint_chars(dst, *in, 1);
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168 } else
169 av_strlcpy(stack[sptr++].tag, buffer,
170 sizeof(stack[0].tag));
171 break;
172 }
173 }
174 default:
f6fa7814 175 av_bprint_chars(dst, *in, 1);
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176 break;
177 }
178 if (*in != ' ' && *in != '\r' && *in != '\n')
179 line_start = 0;
180 }
181
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182 while (dst->len >= 2 && !strncmp(&dst->str[dst->len - 2], "\\N", 2))
183 dst->len -= 2;
184 dst->str[dst->len] = 0;
185 rstrip_spaces_buf(dst);
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186}
187
188static int srt_decode_frame(AVCodecContext *avctx,
189 void *data, int *got_sub_ptr, AVPacket *avpkt)
190{
191 AVSubtitle *sub = data;
f6fa7814 192 AVBPrint buffer;
2ba45a60 193 int ts_start, ts_end, x1 = -1, y1 = -1, x2 = -1, y2 = -1;
f6fa7814 194 int size, ret;
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195 const uint8_t *p = av_packet_get_side_data(avpkt, AV_PKT_DATA_SUBTITLE_POSITION, &size);
196
197 if (p && size == 16) {
198 x1 = AV_RL32(p );
199 y1 = AV_RL32(p + 4);
200 x2 = AV_RL32(p + 8);
201 y2 = AV_RL32(p + 12);
202 }
203
204 if (avpkt->size <= 0)
205 return avpkt->size;
206
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207 av_bprint_init(&buffer, 0, AV_BPRINT_SIZE_UNLIMITED);
208
209 // TODO: reindent
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210 // Do final divide-by-10 outside rescale to force rounding down.
211 ts_start = av_rescale_q(avpkt->pts,
212 avctx->time_base,
213 (AVRational){1,100});
214 ts_end = av_rescale_q(avpkt->pts + avpkt->duration,
215 avctx->time_base,
216 (AVRational){1,100});
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217
218 srt_to_ass(avctx, &buffer, avpkt->data, x1, y1, x2, y2);
219 ret = ff_ass_add_rect_bprint(sub, &buffer, ts_start, ts_end-ts_start);
220 av_bprint_finalize(&buffer, NULL);
221 if (ret < 0)
222 return ret;
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223
224 *got_sub_ptr = sub->num_rects > 0;
225 return avpkt->size;
226}
227
228#if CONFIG_SRT_DECODER
229/* deprecated decoder */
230AVCodec ff_srt_decoder = {
231 .name = "srt",
f6fa7814 232 .long_name = NULL_IF_CONFIG_SMALL("SubRip subtitle"),
2ba45a60 233 .type = AVMEDIA_TYPE_SUBTITLE,
f6fa7814 234 .id = AV_CODEC_ID_SUBRIP,
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235 .init = ff_ass_subtitle_header_default,
236 .decode = srt_decode_frame,
237};
238#endif
239
240#if CONFIG_SUBRIP_DECODER
241AVCodec ff_subrip_decoder = {
242 .name = "subrip",
243 .long_name = NULL_IF_CONFIG_SMALL("SubRip subtitle"),
244 .type = AVMEDIA_TYPE_SUBTITLE,
245 .id = AV_CODEC_ID_SUBRIP,
246 .init = ff_ass_subtitle_header_default,
247 .decode = srt_decode_frame,
248};
249#endif