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2ba45a60 DM |
1 | /* |
2 | * SubRip subtitle encoder | |
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 <stdarg.h> | |
23 | #include "avcodec.h" | |
24 | #include "libavutil/avstring.h" | |
25 | #include "libavutil/bprint.h" | |
26 | #include "ass_split.h" | |
27 | #include "ass.h" | |
28 | ||
29 | ||
30 | #define SRT_STACK_SIZE 64 | |
31 | ||
32 | typedef struct { | |
33 | AVCodecContext *avctx; | |
34 | ASSSplitContext *ass_ctx; | |
35 | AVBPrint buffer; | |
2ba45a60 DM |
36 | char stack[SRT_STACK_SIZE]; |
37 | int stack_ptr; | |
38 | int alignment_applied; | |
39 | } SRTContext; | |
40 | ||
41 | ||
42 | #ifdef __GNUC__ | |
43 | __attribute__ ((__format__ (__printf__, 2, 3))) | |
44 | #endif | |
45 | static void srt_print(SRTContext *s, const char *str, ...) | |
46 | { | |
47 | va_list vargs; | |
48 | va_start(vargs, str); | |
49 | av_vbprintf(&s->buffer, str, vargs); | |
50 | va_end(vargs); | |
51 | } | |
52 | ||
53 | static int srt_stack_push(SRTContext *s, const char c) | |
54 | { | |
55 | if (s->stack_ptr >= SRT_STACK_SIZE) | |
56 | return -1; | |
57 | s->stack[s->stack_ptr++] = c; | |
58 | return 0; | |
59 | } | |
60 | ||
61 | static char srt_stack_pop(SRTContext *s) | |
62 | { | |
63 | if (s->stack_ptr <= 0) | |
64 | return 0; | |
65 | return s->stack[--s->stack_ptr]; | |
66 | } | |
67 | ||
68 | static int srt_stack_find(SRTContext *s, const char c) | |
69 | { | |
70 | int i; | |
71 | for (i = s->stack_ptr-1; i >= 0; i--) | |
72 | if (s->stack[i] == c) | |
73 | break; | |
74 | return i; | |
75 | } | |
76 | ||
77 | static void srt_close_tag(SRTContext *s, char tag) | |
78 | { | |
79 | srt_print(s, "</%c%s>", tag, tag == 'f' ? "ont" : ""); | |
80 | } | |
81 | ||
82 | static void srt_stack_push_pop(SRTContext *s, const char c, int close) | |
83 | { | |
84 | if (close) { | |
85 | int i = c ? srt_stack_find(s, c) : 0; | |
86 | if (i < 0) | |
87 | return; | |
88 | while (s->stack_ptr != i) | |
89 | srt_close_tag(s, srt_stack_pop(s)); | |
90 | } else if (srt_stack_push(s, c) < 0) | |
91 | av_log(s->avctx, AV_LOG_ERROR, "tag stack overflow\n"); | |
92 | } | |
93 | ||
94 | static void srt_style_apply(SRTContext *s, const char *style) | |
95 | { | |
96 | ASSStyle *st = ff_ass_style_get(s->ass_ctx, style); | |
97 | if (st) { | |
98 | int c = st->primary_color & 0xFFFFFF; | |
99 | if (st->font_name && strcmp(st->font_name, ASS_DEFAULT_FONT) || | |
100 | st->font_size != ASS_DEFAULT_FONT_SIZE || | |
101 | c != ASS_DEFAULT_COLOR) { | |
102 | srt_print(s, "<font"); | |
103 | if (st->font_name && strcmp(st->font_name, ASS_DEFAULT_FONT)) | |
104 | srt_print(s, " face=\"%s\"", st->font_name); | |
105 | if (st->font_size != ASS_DEFAULT_FONT_SIZE) | |
106 | srt_print(s, " size=\"%d\"", st->font_size); | |
107 | if (c != ASS_DEFAULT_COLOR) | |
108 | srt_print(s, " color=\"#%06x\"", | |
109 | (c & 0xFF0000) >> 16 | c & 0xFF00 | (c & 0xFF) << 16); | |
110 | srt_print(s, ">"); | |
111 | srt_stack_push(s, 'f'); | |
112 | } | |
113 | if (st->bold != ASS_DEFAULT_BOLD) { | |
114 | srt_print(s, "<b>"); | |
115 | srt_stack_push(s, 'b'); | |
116 | } | |
117 | if (st->italic != ASS_DEFAULT_ITALIC) { | |
118 | srt_print(s, "<i>"); | |
119 | srt_stack_push(s, 'i'); | |
120 | } | |
121 | if (st->underline != ASS_DEFAULT_UNDERLINE) { | |
122 | srt_print(s, "<u>"); | |
123 | srt_stack_push(s, 'u'); | |
124 | } | |
125 | if (st->alignment != ASS_DEFAULT_ALIGNMENT) { | |
126 | srt_print(s, "{\\an%d}", st->alignment); | |
127 | s->alignment_applied = 1; | |
128 | } | |
129 | } | |
130 | } | |
131 | ||
132 | ||
133 | static av_cold int srt_encode_init(AVCodecContext *avctx) | |
134 | { | |
135 | SRTContext *s = avctx->priv_data; | |
136 | s->avctx = avctx; | |
137 | s->ass_ctx = ff_ass_split(avctx->subtitle_header); | |
138 | av_bprint_init(&s->buffer, 0, AV_BPRINT_SIZE_UNLIMITED); | |
139 | return s->ass_ctx ? 0 : AVERROR_INVALIDDATA; | |
140 | } | |
141 | ||
142 | static void srt_text_cb(void *priv, const char *text, int len) | |
143 | { | |
144 | SRTContext *s = priv; | |
145 | av_bprint_append_data(&s->buffer, text, len); | |
146 | } | |
147 | ||
148 | static void srt_new_line_cb(void *priv, int forced) | |
149 | { | |
150 | srt_print(priv, "\r\n"); | |
151 | } | |
152 | ||
153 | static void srt_style_cb(void *priv, char style, int close) | |
154 | { | |
155 | srt_stack_push_pop(priv, style, close); | |
156 | if (!close) | |
157 | srt_print(priv, "<%c>", style); | |
158 | } | |
159 | ||
160 | static void srt_color_cb(void *priv, unsigned int color, unsigned int color_id) | |
161 | { | |
162 | if (color_id > 1) | |
163 | return; | |
164 | srt_stack_push_pop(priv, 'f', color == 0xFFFFFFFF); | |
165 | if (color != 0xFFFFFFFF) | |
166 | srt_print(priv, "<font color=\"#%06x\">", | |
167 | (color & 0xFF0000) >> 16 | color & 0xFF00 | (color & 0xFF) << 16); | |
168 | } | |
169 | ||
170 | static void srt_font_name_cb(void *priv, const char *name) | |
171 | { | |
172 | srt_stack_push_pop(priv, 'f', !name); | |
173 | if (name) | |
174 | srt_print(priv, "<font face=\"%s\">", name); | |
175 | } | |
176 | ||
177 | static void srt_font_size_cb(void *priv, int size) | |
178 | { | |
179 | srt_stack_push_pop(priv, 'f', size < 0); | |
180 | if (size >= 0) | |
181 | srt_print(priv, "<font size=\"%d\">", size); | |
182 | } | |
183 | ||
184 | static void srt_alignment_cb(void *priv, int alignment) | |
185 | { | |
186 | SRTContext *s = priv; | |
187 | if (!s->alignment_applied && alignment >= 0) { | |
188 | srt_print(s, "{\\an%d}", alignment); | |
189 | s->alignment_applied = 1; | |
190 | } | |
191 | } | |
192 | ||
193 | static void srt_cancel_overrides_cb(void *priv, const char *style) | |
194 | { | |
195 | srt_stack_push_pop(priv, 0, 1); | |
196 | srt_style_apply(priv, style); | |
197 | } | |
198 | ||
199 | static void srt_move_cb(void *priv, int x1, int y1, int x2, int y2, | |
200 | int t1, int t2) | |
201 | { | |
f6fa7814 DM |
202 | // TODO: add a AV_PKT_DATA_SUBTITLE_POSITION side data when a new subtitles |
203 | // encoding API passing the AVPacket is available. | |
2ba45a60 DM |
204 | } |
205 | ||
206 | static void srt_end_cb(void *priv) | |
207 | { | |
2ba45a60 | 208 | srt_stack_push_pop(priv, 0, 1); |
2ba45a60 DM |
209 | } |
210 | ||
211 | static const ASSCodesCallbacks srt_callbacks = { | |
212 | .text = srt_text_cb, | |
213 | .new_line = srt_new_line_cb, | |
214 | .style = srt_style_cb, | |
215 | .color = srt_color_cb, | |
216 | .font_name = srt_font_name_cb, | |
217 | .font_size = srt_font_size_cb, | |
218 | .alignment = srt_alignment_cb, | |
219 | .cancel_overrides = srt_cancel_overrides_cb, | |
220 | .move = srt_move_cb, | |
221 | .end = srt_end_cb, | |
222 | }; | |
223 | ||
224 | static int srt_encode_frame(AVCodecContext *avctx, | |
225 | unsigned char *buf, int bufsize, const AVSubtitle *sub) | |
226 | { | |
227 | SRTContext *s = avctx->priv_data; | |
228 | ASSDialog *dialog; | |
229 | int i, num; | |
230 | ||
231 | av_bprint_clear(&s->buffer); | |
232 | ||
233 | for (i=0; i<sub->num_rects; i++) { | |
234 | ||
235 | if (sub->rects[i]->type != SUBTITLE_ASS) { | |
236 | av_log(avctx, AV_LOG_ERROR, "Only SUBTITLE_ASS type supported.\n"); | |
237 | return AVERROR(ENOSYS); | |
238 | } | |
239 | ||
240 | dialog = ff_ass_split_dialog(s->ass_ctx, sub->rects[i]->ass, 0, &num); | |
241 | for (; dialog && num--; dialog++) { | |
2ba45a60 DM |
242 | s->alignment_applied = 0; |
243 | srt_style_apply(s, dialog->style); | |
244 | ff_ass_split_override_codes(&srt_callbacks, s, dialog->text); | |
245 | } | |
246 | } | |
247 | ||
248 | if (!av_bprint_is_complete(&s->buffer)) | |
249 | return AVERROR(ENOMEM); | |
250 | if (!s->buffer.len) | |
251 | return 0; | |
252 | ||
253 | if (s->buffer.len > bufsize) { | |
254 | av_log(avctx, AV_LOG_ERROR, "Buffer too small for ASS event.\n"); | |
255 | return -1; | |
256 | } | |
257 | memcpy(buf, s->buffer.str, s->buffer.len); | |
258 | ||
259 | return s->buffer.len; | |
260 | } | |
261 | ||
262 | static int srt_encode_close(AVCodecContext *avctx) | |
263 | { | |
264 | SRTContext *s = avctx->priv_data; | |
265 | ff_ass_split_free(s->ass_ctx); | |
266 | av_bprint_finalize(&s->buffer, NULL); | |
267 | return 0; | |
268 | } | |
269 | ||
270 | #if CONFIG_SRT_ENCODER | |
271 | /* deprecated encoder */ | |
272 | AVCodec ff_srt_encoder = { | |
273 | .name = "srt", | |
f6fa7814 | 274 | .long_name = NULL_IF_CONFIG_SMALL("SubRip subtitle"), |
2ba45a60 | 275 | .type = AVMEDIA_TYPE_SUBTITLE, |
f6fa7814 | 276 | .id = AV_CODEC_ID_SUBRIP, |
2ba45a60 DM |
277 | .priv_data_size = sizeof(SRTContext), |
278 | .init = srt_encode_init, | |
279 | .encode_sub = srt_encode_frame, | |
280 | .close = srt_encode_close, | |
281 | }; | |
282 | #endif | |
283 | ||
284 | #if CONFIG_SUBRIP_ENCODER | |
285 | AVCodec ff_subrip_encoder = { | |
286 | .name = "subrip", | |
287 | .long_name = NULL_IF_CONFIG_SMALL("SubRip subtitle"), | |
288 | .type = AVMEDIA_TYPE_SUBTITLE, | |
289 | .id = AV_CODEC_ID_SUBRIP, | |
290 | .priv_data_size = sizeof(SRTContext), | |
291 | .init = srt_encode_init, | |
292 | .encode_sub = srt_encode_frame, | |
293 | .close = srt_encode_close, | |
294 | }; | |
295 | #endif |