Add ff_ prefix to data symbols of encoders, decoders, hwaccel, parsers, bsf.
[libav.git] / libavcodec / dvbsub.c
1 /*
2 * DVB subtitle encoding for ffmpeg
3 * Copyright (c) 2005 Fabrice Bellard
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 #include "avcodec.h"
22 #include "bytestream.h"
23 #include "libavutil/colorspace.h"
24
25 typedef struct DVBSubtitleContext {
26 int hide_state;
27 int object_version;
28 } DVBSubtitleContext;
29
30 #define PUTBITS2(val)\
31 {\
32 bitbuf |= (val) << bitcnt;\
33 bitcnt -= 2;\
34 if (bitcnt < 0) {\
35 bitcnt = 6;\
36 *q++ = bitbuf;\
37 bitbuf = 0;\
38 }\
39 }
40
41 static void dvb_encode_rle2(uint8_t **pq,
42 const uint8_t *bitmap, int linesize,
43 int w, int h)
44 {
45 uint8_t *q;
46 unsigned int bitbuf;
47 int bitcnt;
48 int x, y, len, x1, v, color;
49
50 q = *pq;
51
52 for(y = 0; y < h; y++) {
53 *q++ = 0x10;
54 bitbuf = 0;
55 bitcnt = 6;
56
57 x = 0;
58 while (x < w) {
59 x1 = x;
60 color = bitmap[x1++];
61 while (x1 < w && bitmap[x1] == color)
62 x1++;
63 len = x1 - x;
64 if (color == 0 && len == 2) {
65 PUTBITS2(0);
66 PUTBITS2(0);
67 PUTBITS2(1);
68 } else if (len >= 3 && len <= 10) {
69 v = len - 3;
70 PUTBITS2(0);
71 PUTBITS2((v >> 2) | 2);
72 PUTBITS2(v & 3);
73 PUTBITS2(color);
74 } else if (len >= 12 && len <= 27) {
75 v = len - 12;
76 PUTBITS2(0);
77 PUTBITS2(0);
78 PUTBITS2(2);
79 PUTBITS2(v >> 2);
80 PUTBITS2(v & 3);
81 PUTBITS2(color);
82 } else if (len >= 29) {
83 /* length = 29 ... 284 */
84 if (len > 284)
85 len = 284;
86 v = len - 29;
87 PUTBITS2(0);
88 PUTBITS2(0);
89 PUTBITS2(3);
90 PUTBITS2((v >> 6));
91 PUTBITS2((v >> 4) & 3);
92 PUTBITS2((v >> 2) & 3);
93 PUTBITS2(v & 3);
94 PUTBITS2(color);
95 } else {
96 PUTBITS2(color);
97 if (color == 0) {
98 PUTBITS2(1);
99 }
100 len = 1;
101 }
102 x += len;
103 }
104 /* end of line */
105 PUTBITS2(0);
106 PUTBITS2(0);
107 PUTBITS2(0);
108 if (bitcnt != 6) {
109 *q++ = bitbuf;
110 }
111 *q++ = 0xf0;
112 bitmap += linesize;
113 }
114 *pq = q;
115 }
116
117 #define PUTBITS4(val)\
118 {\
119 bitbuf |= (val) << bitcnt;\
120 bitcnt -= 4;\
121 if (bitcnt < 0) {\
122 bitcnt = 4;\
123 *q++ = bitbuf;\
124 bitbuf = 0;\
125 }\
126 }
127
128 /* some DVB decoders only implement 4 bits/pixel */
129 static void dvb_encode_rle4(uint8_t **pq,
130 const uint8_t *bitmap, int linesize,
131 int w, int h)
132 {
133 uint8_t *q;
134 unsigned int bitbuf;
135 int bitcnt;
136 int x, y, len, x1, v, color;
137
138 q = *pq;
139
140 for(y = 0; y < h; y++) {
141 *q++ = 0x11;
142 bitbuf = 0;
143 bitcnt = 4;
144
145 x = 0;
146 while (x < w) {
147 x1 = x;
148 color = bitmap[x1++];
149 while (x1 < w && bitmap[x1] == color)
150 x1++;
151 len = x1 - x;
152 if (color == 0 && len == 2) {
153 PUTBITS4(0);
154 PUTBITS4(0xd);
155 } else if (color == 0 && (len >= 3 && len <= 9)) {
156 PUTBITS4(0);
157 PUTBITS4(len - 2);
158 } else if (len >= 4 && len <= 7) {
159 PUTBITS4(0);
160 PUTBITS4(8 + len - 4);
161 PUTBITS4(color);
162 } else if (len >= 9 && len <= 24) {
163 PUTBITS4(0);
164 PUTBITS4(0xe);
165 PUTBITS4(len - 9);
166 PUTBITS4(color);
167 } else if (len >= 25) {
168 if (len > 280)
169 len = 280;
170 v = len - 25;
171 PUTBITS4(0);
172 PUTBITS4(0xf);
173 PUTBITS4(v >> 4);
174 PUTBITS4(v & 0xf);
175 PUTBITS4(color);
176 } else {
177 PUTBITS4(color);
178 if (color == 0) {
179 PUTBITS4(0xc);
180 }
181 len = 1;
182 }
183 x += len;
184 }
185 /* end of line */
186 PUTBITS4(0);
187 PUTBITS4(0);
188 if (bitcnt != 4) {
189 *q++ = bitbuf;
190 }
191 *q++ = 0xf0;
192 bitmap += linesize;
193 }
194 *pq = q;
195 }
196
197 static int encode_dvb_subtitles(DVBSubtitleContext *s,
198 uint8_t *outbuf, AVSubtitle *h)
199 {
200 uint8_t *q, *pseg_len;
201 int page_id, region_id, clut_id, object_id, i, bpp_index, page_state;
202
203
204 q = outbuf;
205
206 page_id = 1;
207
208 if (h->num_rects == 0 || h->rects == NULL)
209 return -1;
210
211 *q++ = 0x00; /* subtitle_stream_id */
212
213 /* page composition segment */
214
215 *q++ = 0x0f; /* sync_byte */
216 *q++ = 0x10; /* segment_type */
217 bytestream_put_be16(&q, page_id);
218 pseg_len = q;
219 q += 2; /* segment length */
220 *q++ = 30; /* page_timeout (seconds) */
221 if (s->hide_state)
222 page_state = 0; /* normal case */
223 else
224 page_state = 2; /* mode change */
225 /* page_version = 0 + page_state */
226 *q++ = s->object_version | (page_state << 2) | 3;
227
228 for (region_id = 0; region_id < h->num_rects; region_id++) {
229 *q++ = region_id;
230 *q++ = 0xff; /* reserved */
231 bytestream_put_be16(&q, h->rects[region_id]->x); /* left pos */
232 bytestream_put_be16(&q, h->rects[region_id]->y); /* top pos */
233 }
234
235 bytestream_put_be16(&pseg_len, q - pseg_len - 2);
236
237 if (!s->hide_state) {
238 for (clut_id = 0; clut_id < h->num_rects; clut_id++) {
239
240 /* CLUT segment */
241
242 if (h->rects[clut_id]->nb_colors <= 4) {
243 /* 2 bpp, some decoders do not support it correctly */
244 bpp_index = 0;
245 } else if (h->rects[clut_id]->nb_colors <= 16) {
246 /* 4 bpp, standard encoding */
247 bpp_index = 1;
248 } else {
249 return -1;
250 }
251
252 *q++ = 0x0f; /* sync byte */
253 *q++ = 0x12; /* CLUT definition segment */
254 bytestream_put_be16(&q, page_id);
255 pseg_len = q;
256 q += 2; /* segment length */
257 *q++ = clut_id;
258 *q++ = (0 << 4) | 0xf; /* version = 0 */
259
260 for(i = 0; i < h->rects[clut_id]->nb_colors; i++) {
261 *q++ = i; /* clut_entry_id */
262 *q++ = (1 << (7 - bpp_index)) | (0xf << 1) | 1; /* 2 bits/pixel full range */
263 {
264 int a, r, g, b;
265 uint32_t x= ((uint32_t*)h->rects[clut_id]->pict.data[1])[i];
266 a = (x >> 24) & 0xff;
267 r = (x >> 16) & 0xff;
268 g = (x >> 8) & 0xff;
269 b = (x >> 0) & 0xff;
270
271 *q++ = RGB_TO_Y_CCIR(r, g, b);
272 *q++ = RGB_TO_V_CCIR(r, g, b, 0);
273 *q++ = RGB_TO_U_CCIR(r, g, b, 0);
274 *q++ = 255 - a;
275 }
276 }
277
278 bytestream_put_be16(&pseg_len, q - pseg_len - 2);
279 }
280 }
281
282 for (region_id = 0; region_id < h->num_rects; region_id++) {
283
284 /* region composition segment */
285
286 if (h->rects[region_id]->nb_colors <= 4) {
287 /* 2 bpp, some decoders do not support it correctly */
288 bpp_index = 0;
289 } else if (h->rects[region_id]->nb_colors <= 16) {
290 /* 4 bpp, standard encoding */
291 bpp_index = 1;
292 } else {
293 return -1;
294 }
295
296 *q++ = 0x0f; /* sync_byte */
297 *q++ = 0x11; /* segment_type */
298 bytestream_put_be16(&q, page_id);
299 pseg_len = q;
300 q += 2; /* segment length */
301 *q++ = region_id;
302 *q++ = (s->object_version << 4) | (0 << 3) | 0x07; /* version , no fill */
303 bytestream_put_be16(&q, h->rects[region_id]->w); /* region width */
304 bytestream_put_be16(&q, h->rects[region_id]->h); /* region height */
305 *q++ = ((1 + bpp_index) << 5) | ((1 + bpp_index) << 2) | 0x03;
306 *q++ = region_id; /* clut_id == region_id */
307 *q++ = 0; /* 8 bit fill colors */
308 *q++ = 0x03; /* 4 bit and 2 bit fill colors */
309
310 if (!s->hide_state) {
311 bytestream_put_be16(&q, region_id); /* object_id == region_id */
312 *q++ = (0 << 6) | (0 << 4);
313 *q++ = 0;
314 *q++ = 0xf0;
315 *q++ = 0;
316 }
317
318 bytestream_put_be16(&pseg_len, q - pseg_len - 2);
319 }
320
321 if (!s->hide_state) {
322
323 for (object_id = 0; object_id < h->num_rects; object_id++) {
324 /* Object Data segment */
325
326 if (h->rects[object_id]->nb_colors <= 4) {
327 /* 2 bpp, some decoders do not support it correctly */
328 bpp_index = 0;
329 } else if (h->rects[object_id]->nb_colors <= 16) {
330 /* 4 bpp, standard encoding */
331 bpp_index = 1;
332 } else {
333 return -1;
334 }
335
336 *q++ = 0x0f; /* sync byte */
337 *q++ = 0x13;
338 bytestream_put_be16(&q, page_id);
339 pseg_len = q;
340 q += 2; /* segment length */
341
342 bytestream_put_be16(&q, object_id);
343 *q++ = (s->object_version << 4) | (0 << 2) | (0 << 1) | 1; /* version = 0,
344 onject_coding_method,
345 non_modifying_color_flag */
346 {
347 uint8_t *ptop_field_len, *pbottom_field_len, *top_ptr, *bottom_ptr;
348 void (*dvb_encode_rle)(uint8_t **pq,
349 const uint8_t *bitmap, int linesize,
350 int w, int h);
351 ptop_field_len = q;
352 q += 2;
353 pbottom_field_len = q;
354 q += 2;
355
356 if (bpp_index == 0)
357 dvb_encode_rle = dvb_encode_rle2;
358 else
359 dvb_encode_rle = dvb_encode_rle4;
360
361 top_ptr = q;
362 dvb_encode_rle(&q, h->rects[object_id]->pict.data[0], h->rects[object_id]->w * 2,
363 h->rects[object_id]->w, h->rects[object_id]->h >> 1);
364 bottom_ptr = q;
365 dvb_encode_rle(&q, h->rects[object_id]->pict.data[0] + h->rects[object_id]->w,
366 h->rects[object_id]->w * 2, h->rects[object_id]->w,
367 h->rects[object_id]->h >> 1);
368
369 bytestream_put_be16(&ptop_field_len, bottom_ptr - top_ptr);
370 bytestream_put_be16(&pbottom_field_len, q - bottom_ptr);
371 }
372
373 bytestream_put_be16(&pseg_len, q - pseg_len - 2);
374 }
375 }
376
377 /* end of display set segment */
378
379 *q++ = 0x0f; /* sync_byte */
380 *q++ = 0x80; /* segment_type */
381 bytestream_put_be16(&q, page_id);
382 pseg_len = q;
383 q += 2; /* segment length */
384
385 bytestream_put_be16(&pseg_len, q - pseg_len - 2);
386
387 *q++ = 0xff; /* end of PES data */
388
389 s->object_version = (s->object_version + 1) & 0xf;
390 s->hide_state = !s->hide_state;
391 return q - outbuf;
392 }
393
394 static int dvbsub_encode(AVCodecContext *avctx,
395 unsigned char *buf, int buf_size, void *data)
396 {
397 DVBSubtitleContext *s = avctx->priv_data;
398 AVSubtitle *sub = data;
399 int ret;
400
401 ret = encode_dvb_subtitles(s, buf, sub);
402 return ret;
403 }
404
405 AVCodec ff_dvbsub_encoder = {
406 "dvbsub",
407 AVMEDIA_TYPE_SUBTITLE,
408 CODEC_ID_DVB_SUBTITLE,
409 sizeof(DVBSubtitleContext),
410 NULL,
411 dvbsub_encode,
412 .long_name = NULL_IF_CONFIG_SMALL("DVB subtitles"),
413 };