1 /*****************************************************************************
3 *****************************************************************************
4 * Copyright (C) 2000-2001 VideoLAN
5 * $Id: parse.c,v 1.17 2004/01/27 22:51:39 hartman Exp $
7 * Authors: Samuel Hocevar <sam@zoy.org>
8 * Laurent Aimar <fenrir@via.ecp.fr>
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License as published by
12 * the Free Software Foundation; either version 2 of the License, or
13 * (at your option) any later version.
15 * This program is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 * GNU General Public License for more details.
20 * You should have received a copy of the GNU General Public License
21 * along with this program; if not, write to the Free Software
22 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111, USA.
23 *****************************************************************************/
25 /*****************************************************************************
27 *****************************************************************************/
30 #include <vlc/decoder.h>
34 /*****************************************************************************
36 *****************************************************************************/
37 static int ParseControlSeq ( decoder_t *, subpicture_t * );
38 static int ParseRLE ( decoder_t *, subpicture_t * );
40 static void DestroySPU ( subpicture_t * );
42 static void UpdateSPU ( subpicture_t *, vlc_object_t * );
43 static int CropCallback ( vlc_object_t *, char const *,
44 vlc_value_t, vlc_value_t, void * );
46 /*****************************************************************************
47 * AddNibble: read a nibble from a source packet and add it to our integer.
48 *****************************************************************************/
49 static inline unsigned int AddNibble( unsigned int i_code,
50 uint8_t *p_src, int *pi_index )
54 return( i_code << 4 | ( p_src[(*pi_index)++ >> 1] & 0xf ) );
58 return( i_code << 4 | p_src[(*pi_index)++ >> 1] >> 4 );
62 /*****************************************************************************
63 * ParsePacket: parse an SPU packet and send it to the video output
64 *****************************************************************************
65 * This function parses the SPU packet and, if valid, sends it to the
67 *****************************************************************************/
68 void E_(ParsePacket)( decoder_t *p_dec)
70 decoder_sys_t *p_sys = p_dec->p_sys;
74 /* Allocate the subpicture internal data. */
75 p_spu = vout_CreateSubPicture( p_sys->p_vout, MEMORY_SUBPICTURE );
81 /* Rationale for the "p_spudec->i_rle_size * 4": we are going to
82 * expand the RLE stuff so that we won't need to read nibbles later
83 * on. This will speed things up a lot. Plus, we'll only need to do
84 * this stupid interlacing stuff once. */
85 p_spu->p_sys = malloc( sizeof( subpicture_sys_t ) + 4*p_sys->i_rle_size );
87 /* Fill the p_spu structure */
88 vlc_mutex_init( p_dec, &p_spu->p_sys->lock );
90 p_spu->pf_render = E_(RenderSPU);
91 p_spu->pf_destroy = DestroySPU;
92 p_spu->p_sys->p_data = (uint8_t*)p_spu->p_sys + sizeof( subpicture_sys_t );
93 p_spu->p_sys->b_palette = VLC_FALSE;
95 p_spu->p_sys->pi_alpha[0] = 0x00;
96 p_spu->p_sys->pi_alpha[1] = 0x0f;
97 p_spu->p_sys->pi_alpha[2] = 0x0f;
98 p_spu->p_sys->pi_alpha[3] = 0x0f;
100 p_spu->p_sys->b_crop = VLC_FALSE;
102 /* Get display time now. If we do it later, we may miss the PTS. */
103 p_spu->p_sys->i_pts = p_sys->i_pts;
105 /* Attach to our input thread */
106 p_spu->p_sys->p_input = vlc_object_find( p_dec,
107 VLC_OBJECT_INPUT, FIND_PARENT );
108 if( p_spu->p_sys->p_input )
112 if( !var_Get( p_spu->p_sys->p_input, "highlight-mutex", &val ) )
114 vlc_mutex_t *p_mutex = val.p_address;
116 vlc_mutex_lock( p_mutex );
117 UpdateSPU( p_spu, VLC_OBJECT(p_spu->p_sys->p_input) );
119 var_AddCallback( p_spu->p_sys->p_input,
120 "highlight", CropCallback, p_spu );
121 vlc_mutex_unlock( p_mutex );
125 /* Getting the control part */
126 if( ParseControlSeq( p_dec, p_spu ) )
128 /* There was a parse error, delete the subpicture */
129 vout_DestroySubPicture( p_sys->p_vout, p_spu );
133 /* We try to display it */
134 if( ParseRLE( p_dec, p_spu ) )
136 /* There was a parse error, delete the subpicture */
137 vout_DestroySubPicture( p_sys->p_vout, p_spu );
141 msg_Dbg( p_dec, "total size: 0x%x, RLE offsets: 0x%x 0x%x",
143 p_spu->p_sys->pi_offset[0], p_spu->p_sys->pi_offset[1] );
145 /* SPU is finished - we can ask the video output to display it */
146 vout_DisplaySubPicture( p_sys->p_vout, p_spu );
148 /* TODO: do stuff! */
151 /*****************************************************************************
152 * ParseControlSeq: parse all SPU control sequences
153 *****************************************************************************
154 * This is the most important part in SPU decoding. We get dates, palette
155 * information, coordinates, and so on. For more information on the
156 * subtitles format, see http://sam.zoy.org/doc/dvd/subtitles/index.html
157 *****************************************************************************/
158 static int ParseControlSeq( decoder_t *p_dec, subpicture_t * p_spu )
160 decoder_sys_t *p_sys = p_dec->p_sys;
162 /* Our current index in the SPU packet */
163 unsigned int i_index = p_sys->i_rle_size + 4;
165 /* The next start-of-control-sequence index and the previous one */
166 unsigned int i_next_seq = 0, i_cur_seq = 0;
168 /* Command and date */
169 uint8_t i_command = SPU_CMD_END;
172 unsigned int i, pi_alpha[4];
174 /* Initialize the structure */
175 p_spu->i_start = p_spu->i_stop = 0;
176 p_spu->b_ephemer = VLC_FALSE;
180 if( (int)i_index >= p_sys->i_spu_size + 1 )
183 * XXX only on test by loop as p_sys->buffer is bigger than needed
184 * to avoid checking at each access
189 /* If we just read a command sequence, read the next one;
190 * otherwise, go on with the commands of the current sequence. */
191 if( i_command == SPU_CMD_END )
193 /* Get the control sequence date */
194 date = (mtime_t)GetWBE( &p_sys->buffer[i_index] ) * 11000;
195 /* FIXME How to access i_rate
196 * p_spudec->bit_stream.p_pes->i_rate / DEFAULT_RATE;
201 i_next_seq = GetWBE( &p_sys->buffer[i_index+2] );
203 /* Skip what we just read */
207 i_command = p_sys->buffer[i_index++];
211 case SPU_CMD_FORCE_DISPLAY: /* 00 (force displaying) */
212 p_spu->i_start = p_spu->p_sys->i_pts + date;
213 p_spu->b_ephemer = VLC_TRUE;
216 /* Convert the dates in seconds to PTS values */
217 case SPU_CMD_START_DISPLAY: /* 01 (start displaying) */
218 p_spu->i_start = p_spu->p_sys->i_pts + date;
221 case SPU_CMD_STOP_DISPLAY: /* 02 (stop displaying) */
222 p_spu->i_stop = p_spu->p_sys->i_pts + date;
225 case SPU_CMD_SET_PALETTE:
227 /* 03xxxx (palette) */
228 if( p_dec->fmt_in.subs.spu.palette[0] == 0xBeeF )
232 p_spu->p_sys->b_palette = VLC_TRUE;
234 idx[0] = (p_sys->buffer[i_index+0]>>4)&0x0f;
235 idx[1] = (p_sys->buffer[i_index+0])&0x0f;
236 idx[2] = (p_sys->buffer[i_index+1]>>4)&0x0f;
237 idx[3] = (p_sys->buffer[i_index+1])&0x0f;
239 for( i = 0; i < 4 ; i++ )
241 uint32_t i_color = p_dec->fmt_in.subs.spu.palette[1+idx[i]];
243 /* FIXME: this job should be done sooner */
244 p_spu->p_sys->pi_yuv[3-i][0] = (i_color>>16) & 0xff;
245 p_spu->p_sys->pi_yuv[3-i][1] = (i_color>>0) & 0xff;
246 p_spu->p_sys->pi_yuv[3-i][2] = (i_color>>8) & 0xff;
253 case SPU_CMD_SET_ALPHACHANNEL: /* 04xxxx (alpha channel) */
254 pi_alpha[3] = (p_sys->buffer[i_index+0]>>4)&0x0f;
255 pi_alpha[2] = (p_sys->buffer[i_index+0])&0x0f;
256 pi_alpha[1] = (p_sys->buffer[i_index+1]>>4)&0x0f;
257 pi_alpha[0] = (p_sys->buffer[i_index+1])&0x0f;
259 /* Ignore blank alpha palette. Sometimes spurious blank
260 * alpha palettes are present - dunno why. */
261 if( pi_alpha[0] | pi_alpha[1] | pi_alpha[2] | pi_alpha[3] )
263 p_spu->p_sys->pi_alpha[0] = pi_alpha[0];
264 p_spu->p_sys->pi_alpha[1] = pi_alpha[1];
265 p_spu->p_sys->pi_alpha[2] = pi_alpha[2];
266 p_spu->p_sys->pi_alpha[3] = pi_alpha[3];
270 msg_Warn( p_dec, "ignoring blank alpha palette" );
276 case SPU_CMD_SET_COORDINATES: /* 05xxxyyyxxxyyy (coordinates) */
277 p_spu->i_x = (p_sys->buffer[i_index+0]<<4)|
278 ((p_sys->buffer[i_index+1]>>4)&0x0f);
279 p_spu->i_width = (((p_sys->buffer[i_index+1]&0x0f)<<8)|
280 p_sys->buffer[i_index+2]) - p_spu->i_x + 1;
282 p_spu->i_y = (p_sys->buffer[i_index+3]<<4)|
283 ((p_sys->buffer[i_index+4]>>4)&0x0f);
284 p_spu->i_height = (((p_sys->buffer[i_index+4]&0x0f)<<8)|
285 p_sys->buffer[i_index+5]) - p_spu->i_y + 1;
290 case SPU_CMD_SET_OFFSETS: /* 06xxxxyyyy (byte offsets) */
291 p_spu->p_sys->pi_offset[0] = GetWBE(&p_sys->buffer[i_index+0]) - 4;
292 p_spu->p_sys->pi_offset[1] = GetWBE(&p_sys->buffer[i_index+2]) - 4;
296 case SPU_CMD_END: /* ff (end) */
299 default: /* xx (unknown command) */
300 msg_Warn( p_dec, "unknown command 0x%.2x", i_command );
304 /* We need to check for quit commands here */
310 } while( i_command != SPU_CMD_END || i_index == i_next_seq );
312 /* Check that the next sequence index matches the current one */
313 if( i_next_seq != i_cur_seq )
315 msg_Err( p_dec, "index mismatch (0x%.4x != 0x%.4x)",
316 i_next_seq, i_cur_seq );
320 if( (int)i_index > p_sys->i_spu_size )
322 msg_Err( p_dec, "uh-oh, we went too far (0x%.4x > 0x%.4x)",
323 i_index, p_sys->i_spu_size );
327 if( !p_spu->i_start )
329 msg_Err( p_dec, "no `start display' command" );
332 if( p_spu->i_stop <= p_spu->i_start && !p_spu->b_ephemer )
334 /* This subtitle will live for 5 seconds or until the next subtitle */
335 p_spu->i_stop = p_spu->i_start + (mtime_t)500 * 11000;
336 /* FIXME how to access i_rate ?
337 * p_spudec->bit_stream.p_pes->i_rate / DEFAULT_RATE;
339 p_spu->b_ephemer = VLC_TRUE;
342 /* Get rid of padding bytes */
343 if( p_sys->i_spu_size > (int)i_index + 1 )
345 /* Zero or one padding byte, are quite usual
346 * More than one padding byte - this is very strange, but
347 * we can deal with it */
348 msg_Warn( p_dec, "%i padding bytes, we usually get 0 or 1 of them",
349 p_sys->i_spu_size - i_index );
352 /* Successfully parsed ! */
356 /*****************************************************************************
357 * ParseRLE: parse the RLE part of the subtitle
358 *****************************************************************************
359 * This part parses the subtitle graphical data and stores it in a more
360 * convenient structure for later decoding. For more information on the
361 * subtitles format, see http://sam.zoy.org/doc/dvd/subtitles/index.html
362 *****************************************************************************/
363 static int ParseRLE( decoder_t *p_dec, subpicture_t * p_spu )
365 decoder_sys_t *p_sys = p_dec->p_sys;
366 uint8_t *p_src = &p_sys->buffer[4];
370 unsigned int i_width = p_spu->i_width;
371 unsigned int i_height = p_spu->i_height;
372 unsigned int i_x, i_y;
374 uint16_t *p_dest = (uint16_t *)p_spu->p_sys->p_data;
376 /* The subtitles are interlaced, we need two offsets */
377 unsigned int i_id = 0; /* Start on the even SPU layer */
378 unsigned int pi_table[ 2 ];
379 unsigned int *pi_offset;
382 vlc_bool_t b_empty_top = VLC_TRUE,
383 b_empty_bottom = VLC_FALSE;
384 unsigned int i_skipped_top = 0,
385 i_skipped_bottom = 0;
388 /* Colormap statistics */
390 int stats[4]; stats[0] = stats[1] = stats[2] = stats[3] = 0;
392 pi_table[ 0 ] = p_spu->p_sys->pi_offset[ 0 ] << 1;
393 pi_table[ 1 ] = p_spu->p_sys->pi_offset[ 1 ] << 1;
395 for( i_y = 0 ; i_y < i_height ; i_y++ )
397 pi_offset = pi_table + i_id;
399 for( i_x = 0 ; i_x < i_width ; i_x += i_code >> 2 )
401 i_code = AddNibble( 0, p_src, pi_offset );
405 i_code = AddNibble( i_code, p_src, pi_offset );
409 i_code = AddNibble( i_code, p_src, pi_offset );
413 i_code = AddNibble( i_code, p_src, pi_offset );
415 if( i_code < 0x0100 )
417 /* If the 14 first bits are set to 0, then it's a
418 * new line. We emulate it. */
419 if( i_code < 0x0004 )
421 i_code |= ( i_width - i_x ) << 2;
425 /* We have a boo boo ! */
426 msg_Err( p_dec, "unknown RLE code "
435 if( ( (i_code >> 2) + i_x + i_y * i_width ) > i_height * i_width )
438 "out of bounds, %i at (%i,%i) is out of %ix%i",
439 i_code >> 2, i_x, i_y, i_width, i_height );
443 /* Try to find the border color */
444 if( p_spu->p_sys->pi_alpha[ i_code & 0x3 ] != 0x00 )
446 i_border = i_code & 0x3;
447 stats[i_border] += i_code >> 2;
451 if( (i_code >> 2) == i_width
452 && p_spu->p_sys->pi_alpha[ i_code & 0x3 ] == 0x00 )
456 /* This is a blank top line, we skip it */
461 /* We can't be sure the current lines will be skipped,
462 * so we store the code just in case. */
465 b_empty_bottom = VLC_TRUE;
471 /* We got a valid code, store it */
474 /* Valid code means no blank line */
475 b_empty_top = VLC_FALSE;
476 b_empty_bottom = VLC_FALSE;
477 i_skipped_bottom = 0;
484 /* Check that we didn't go too far */
487 msg_Err( p_dec, "i_x overflowed, %i > %i",
492 /* Byte-align the stream */
493 if( *pi_offset & 0x1 )
502 /* We shouldn't get any padding bytes */
505 msg_Err( p_dec, "padding bytes found in RLE sequence" );
506 msg_Err( p_dec, "send mail to <sam@zoy.org> if you "
507 "want to help debugging this" );
509 /* Skip them just in case */
510 while( i_y < i_height )
512 *p_dest++ = i_width << 2;
519 msg_Dbg( p_dec, "valid subtitle, size: %ix%i, position: %i,%i",
520 p_spu->i_width, p_spu->i_height, p_spu->i_x, p_spu->i_y );
523 /* Crop if necessary */
524 if( i_skipped_top || i_skipped_bottom )
526 p_spu->i_y += i_skipped_top;
527 p_spu->i_height -= i_skipped_top + i_skipped_bottom;
529 msg_Dbg( p_spudec->p_fifo, "cropped to: %ix%i, position: %i,%i",
530 p_spu->i_width, p_spu->i_height, p_spu->i_x, p_spu->i_y );
534 /* Handle color if no palette was found */
535 if( !p_spu->p_sys->b_palette )
537 int i, i_inner = -1, i_shade = -1;
539 /* Set the border color */
540 p_spu->p_sys->pi_yuv[i_border][0] = 0x00;
541 p_spu->p_sys->pi_yuv[i_border][1] = 0x80;
542 p_spu->p_sys->pi_yuv[i_border][2] = 0x80;
545 /* Find the inner colors */
546 for( i = 0 ; i < 4 && i_inner == -1 ; i++ )
554 for( ; i < 4 && i_shade == -1 ; i++ )
558 if( stats[i] > stats[i_inner] )
570 /* Set the inner color */
573 p_spu->p_sys->pi_yuv[i_inner][0] = 0xff;
574 p_spu->p_sys->pi_yuv[i_inner][1] = 0x80;
575 p_spu->p_sys->pi_yuv[i_inner][2] = 0x80;
578 /* Set the anti-aliasing color */
581 p_spu->p_sys->pi_yuv[i_shade][0] = 0x80;
582 p_spu->p_sys->pi_yuv[i_shade][1] = 0x80;
583 p_spu->p_sys->pi_yuv[i_shade][2] = 0x80;
587 "using custom palette (border %i, inner %i, shade %i)",
588 i_border, i_inner, i_shade );
594 /*****************************************************************************
595 * DestroySPU: subpicture destructor
596 *****************************************************************************/
597 static void DestroySPU( subpicture_t *p_spu )
599 if( p_spu->p_sys->p_input )
601 /* Detach from our input thread */
602 var_DelCallback( p_spu->p_sys->p_input, "highlight",
603 CropCallback, p_spu );
604 vlc_object_release( p_spu->p_sys->p_input );
607 vlc_mutex_destroy( &p_spu->p_sys->lock );
608 free( p_spu->p_sys );
611 /*****************************************************************************
612 * UpdateSPU: update subpicture settings
613 *****************************************************************************
614 * This function is called from CropCallback and at initialization time, to
615 * retrieve crop information from the input.
616 *****************************************************************************/
617 static void UpdateSPU( subpicture_t *p_spu, vlc_object_t *p_object )
621 if( var_Get( p_object, "highlight", &val ) )
626 p_spu->p_sys->b_crop = val.b_bool;
627 if( !p_spu->p_sys->b_crop )
632 var_Get( p_object, "x-start", &val );
633 p_spu->p_sys->i_x_start = val.i_int;
634 var_Get( p_object, "y-start", &val );
635 p_spu->p_sys->i_y_start = val.i_int;
636 var_Get( p_object, "x-end", &val );
637 p_spu->p_sys->i_x_end = val.i_int;
638 var_Get( p_object, "y-end", &val );
639 p_spu->p_sys->i_y_end = val.i_int;
642 if( var_Get( p_object, "color", &val ) == VLC_SUCCESS )
644 p_spu->p_sys->pi_color[0] = ((uint8_t *)val.p_address)[0];
645 p_spu->p_sys->pi_color[1] = ((uint8_t *)val.p_address)[1];
646 p_spu->p_sys->pi_color[2] = ((uint8_t *)val.p_address)[2];
647 p_spu->p_sys->pi_color[3] = ((uint8_t *)val.p_address)[3];
651 if( var_Get( p_object, "contrast", &val ) == VLC_SUCCESS )
653 p_spu->p_sys->pi_alpha[0] = ((uint8_t *)val.p_address)[0];
654 p_spu->p_sys->pi_alpha[1] = ((uint8_t *)val.p_address)[1];
655 p_spu->p_sys->pi_alpha[2] = ((uint8_t *)val.p_address)[2];
656 p_spu->p_sys->pi_alpha[3] = ((uint8_t *)val.p_address)[3];
660 /*****************************************************************************
661 * CropCallback: called when the highlight properties are changed
662 *****************************************************************************
663 * This callback is called from the input thread when we need cropping
664 *****************************************************************************/
665 static int CropCallback( vlc_object_t *p_object, char const *psz_var,
666 vlc_value_t oldval, vlc_value_t newval, void *p_data )
668 UpdateSPU( (subpicture_t *)p_data, p_object );