1 /*****************************************************************************
2 * spu_decoder.c : spu decoder thread
3 *****************************************************************************
4 * Copyright (C) 2000 VideoLAN
6 * Authors: Samuel Hocevar <sam@zoy.org>
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111, USA.
21 *****************************************************************************/
23 /*****************************************************************************
25 *****************************************************************************/
28 #include <stdlib.h> /* malloc(), free() */
29 #include <unistd.h> /* getpid() */
38 #include "stream_control.h"
39 #include "input_ext-dec.h"
42 #include "video_output.h"
44 #include "spu_decoder.h"
46 /*****************************************************************************
48 *****************************************************************************/
49 static int InitThread ( spudec_thread_t
* );
50 static void RunThread ( spudec_thread_t
* );
51 static void ErrorThread ( spudec_thread_t
* );
52 static void EndThread ( spudec_thread_t
* );
54 static int SyncPacket ( spudec_thread_t
* );
55 static void ParsePacket ( spudec_thread_t
* );
56 static int ParseControlSequences( spudec_thread_t
*, subpicture_t
* );
57 static int ParseRLE ( u8
*, subpicture_t
* );
59 /*****************************************************************************
60 * spudec_CreateThread: create a spu decoder thread
61 *****************************************************************************/
62 vlc_thread_t
spudec_CreateThread( vdec_config_t
* p_config
)
64 spudec_thread_t
* p_spudec
;
66 /* Allocate the memory needed to store the thread's structure */
67 p_spudec
= (spudec_thread_t
*)malloc( sizeof(spudec_thread_t
) );
69 if ( p_spudec
== NULL
)
71 intf_ErrMsg( "spudec error: not enough memory "
72 "for spudec_CreateThread() to create the new thread" );
77 * Initialize the thread properties
79 p_spudec
->p_config
= p_config
;
80 p_spudec
->p_fifo
= p_config
->decoder_config
.p_decoder_fifo
;
82 /* Get the video output informations */
83 p_spudec
->p_vout
= p_config
->p_vout
;
85 /* Spawn the spu decoder thread */
86 if ( vlc_thread_create(&p_spudec
->thread_id
, "spu decoder",
87 (vlc_thread_func_t
)RunThread
, (void *)p_spudec
) )
89 intf_ErrMsg( "spudec error: can't spawn spu decoder thread" );
94 return( p_spudec
->thread_id
);
97 /* following functions are local */
99 /*****************************************************************************
100 * InitThread: initialize spu decoder thread
101 *****************************************************************************
102 * This function is called from RunThread and performs the second step of the
103 * initialization. It returns 0 on success. Note that the thread's flag are not
104 * modified inside this function.
105 *****************************************************************************/
106 static int InitThread( spudec_thread_t
*p_spudec
)
108 p_spudec
->p_config
->decoder_config
.pf_init_bit_stream(
109 &p_spudec
->bit_stream
,
110 p_spudec
->p_config
->decoder_config
.p_decoder_fifo
);
112 /* Mark thread as running and return */
116 /*****************************************************************************
117 * RunThread: spu decoder thread
118 *****************************************************************************
119 * spu decoder thread. This function only returns when the thread is
121 *****************************************************************************/
122 static void RunThread( spudec_thread_t
*p_spudec
)
124 intf_WarnMsg( 1, "spudec: spu decoder thread %i spawned", getpid() );
127 * Initialize thread and free configuration
129 p_spudec
->p_fifo
->b_error
= InitThread( p_spudec
);
132 * Main loop - it is not executed if an error occured during
135 while( (!p_spudec
->p_fifo
->b_die
) && (!p_spudec
->p_fifo
->b_error
) )
137 if( !SyncPacket( p_spudec
) )
139 ParsePacket( p_spudec
);
146 if( p_spudec
->p_fifo
->b_error
)
148 ErrorThread( p_spudec
);
152 intf_WarnMsg( 1, "spudec: destroying spu decoder thread %i", getpid() );
153 EndThread( p_spudec
);
156 /*****************************************************************************
157 * ErrorThread: RunThread() error loop
158 *****************************************************************************
159 * This function is called when an error occured during thread main's loop. The
160 * thread can still receive feed, but must be ready to terminate as soon as
162 *****************************************************************************/
163 static void ErrorThread( spudec_thread_t
*p_spudec
)
165 /* We take the lock, because we are going to read/write the start/end
166 * indexes of the decoder fifo */
167 vlc_mutex_lock( &p_spudec
->p_fifo
->data_lock
);
169 /* Wait until a `die' order is sent */
170 while( !p_spudec
->p_fifo
->b_die
)
172 /* Trash all received PES packets */
173 while( !DECODER_FIFO_ISEMPTY(*p_spudec
->p_fifo
) )
175 p_spudec
->p_fifo
->pf_delete_pes( p_spudec
->p_fifo
->p_packets_mgt
,
176 DECODER_FIFO_START(*p_spudec
->p_fifo
) );
177 DECODER_FIFO_INCSTART( *p_spudec
->p_fifo
);
180 /* Waiting for the input thread to put new PES packets in the fifo */
181 vlc_cond_wait( &p_spudec
->p_fifo
->data_wait
,
182 &p_spudec
->p_fifo
->data_lock
);
185 /* We can release the lock before leaving */
186 vlc_mutex_unlock( &p_spudec
->p_fifo
->data_lock
);
189 /*****************************************************************************
190 * EndThread: thread destruction
191 *****************************************************************************
192 * This function is called when the thread ends after a sucessful
194 *****************************************************************************/
195 static void EndThread( spudec_thread_t
*p_spudec
)
197 free( p_spudec
->p_config
);
201 /*****************************************************************************
202 * SyncPacket: get in sync with the stream
203 *****************************************************************************
204 * This function makes a few sanity checks and returns 0 if it looks like we
205 * are at the beginning of a subpicture packet.
206 *****************************************************************************/
207 static int SyncPacket( spudec_thread_t
*p_spudec
)
209 /* Re-align the buffer on an 8-bit boundary */
210 RealignBits( &p_spudec
->bit_stream
);
212 /* The total SPU packet size, often bigger than a PS packet */
213 p_spudec
->i_spu_size
= GetBits( &p_spudec
->bit_stream
, 16 );
215 /* The RLE stuff size (remove 4 because we just read 32 bits) */
216 p_spudec
->i_rle_size
= ShowBits( &p_spudec
->bit_stream
, 16 ) - 4;
218 /* If the values we got are a bit strange, skip packet */
219 if( p_spudec
->i_rle_size
>= p_spudec
->i_spu_size
)
224 RemoveBits( &p_spudec
->bit_stream
, 16 );
229 /*****************************************************************************
230 * ParsePacket: parse an SPU packet and send it to the video output
231 *****************************************************************************
232 * This function parses the SPU packet and, if valid, sends it to the
234 *****************************************************************************/
235 static void ParsePacket( spudec_thread_t
*p_spudec
)
237 subpicture_t
* p_spu
;
240 /* We cannot display a subpicture with no date */
241 if( DECODER_FIFO_START(*p_spudec
->p_fifo
)->i_pts
== 0 )
246 /* Allocate the subpicture internal data. */
247 p_spu
= vout_CreateSubPicture( p_spudec
->p_vout
, DVD_SUBPICTURE
,
248 p_spudec
->i_rle_size
* 4 );
249 /* Rationale for the "p_spudec->i_rle_size * 4": we are going to
250 * expand the RLE stuff so that we won't need to read nibbles later
251 * on. This will speed things up a lot. Plus, we'll only need to do
252 * this stupid interlacing stuff once. */
259 /* Get display time now. If we do it later, we may miss a PTS. */
260 p_spu
->begin_date
= p_spu
->end_date
261 = DECODER_FIFO_START(*p_spudec
->p_fifo
)->i_pts
;
263 /* Allocate the temporary buffer we will parse */
264 p_src
= malloc( p_spudec
->i_rle_size
);
268 intf_ErrMsg( "spudec error: could not allocate p_src" );
269 vout_DestroySubPicture( p_spudec
->p_vout
, p_spu
);
274 GetChunk( &p_spudec
->bit_stream
, p_src
, p_spudec
->i_rle_size
);
277 /* Dump the subtitle info */
278 intf_WarnHexDump( 0, p_spu
->p_data
, p_spudec
->i_rle_size
);
281 /* Getting the control part */
282 if( ParseControlSequences( p_spudec
, p_spu
) )
284 /* There was a parse error, delete the subpicture */
286 vout_DestroySubPicture( p_spudec
->p_vout
, p_spu
);
290 if( ParseRLE( p_src
, p_spu
) )
292 /* There was a parse error, delete the subpicture */
294 vout_DestroySubPicture( p_spudec
->p_vout
, p_spu
);
298 intf_WarnMsg( 1, "spudec: got a valid %ix%i subtitle at (%i,%i), "
299 "RLE offsets: 0x%x 0x%x",
300 p_spu
->i_width
, p_spu
->i_height
, p_spu
->i_x
, p_spu
->i_y
,
301 p_spu
->type
.spu
.i_offset
[0], p_spu
->type
.spu
.i_offset
[1] );
303 /* SPU is finished - we can tell the video output to display it */
304 vout_DisplaySubPicture( p_spudec
->p_vout
, p_spu
);
310 /*****************************************************************************
311 * ParseControlSequences: parse all SPU control sequences
312 *****************************************************************************
313 * This is the most important part in SPU decoding. We get dates, palette
314 * information, coordinates, and so on. For more information on the
315 * subtitles format, see http://sam.zoy.org/doc/dvd/subtitles/index.html
316 *****************************************************************************/
317 static int ParseControlSequences( spudec_thread_t
*p_spudec
,
318 subpicture_t
* p_spu
)
320 /* Our current index in the SPU packet */
321 int i_index
= p_spudec
->i_rle_size
+ 4;
323 /* The next start-of-control-sequence index and the previous one */
324 int i_next_index
= 0, i_prev_index
;
326 /* Command time and date */
332 /* Get the control sequence date */
333 i_date
= GetBits( &p_spudec
->bit_stream
, 16 );
336 i_prev_index
= i_next_index
;
337 i_next_index
= GetBits( &p_spudec
->bit_stream
, 16 );
339 /* Skip what we just read */
344 i_command
= GetBits( &p_spudec
->bit_stream
, 8 );
349 case SPU_CMD_FORCE_DISPLAY
:
351 /* 00 (force displaying) */
355 /* FIXME: here we have to calculate dates. It's around
356 * i_date * 12000 but I don't know how much exactly. */
357 case SPU_CMD_START_DISPLAY
:
359 /* 01 (start displaying) */
360 p_spu
->begin_date
+= ( i_date
* 11000 );
364 case SPU_CMD_STOP_DISPLAY
:
366 /* 02 (stop displaying) */
367 p_spu
->end_date
+= ( i_date
* 11000 );
371 case SPU_CMD_SET_PALETTE
:
373 /* 03xxxx (palette) - trashed */
374 RemoveBits( &p_spudec
->bit_stream
, 16 );
379 case SPU_CMD_SET_ALPHACHANNEL
:
381 /* 04xxxx (alpha channel) - trashed */
382 RemoveBits( &p_spudec
->bit_stream
, 16 );
387 case SPU_CMD_SET_COORDINATES
:
389 /* 05xxxyyyxxxyyy (coordinates) */
390 p_spu
->i_x
= GetBits( &p_spudec
->bit_stream
, 12 );
391 p_spu
->i_width
= GetBits( &p_spudec
->bit_stream
, 12 )
394 p_spu
->i_y
= GetBits( &p_spudec
->bit_stream
, 12 );
395 p_spu
->i_height
= GetBits( &p_spudec
->bit_stream
, 12 )
402 case SPU_CMD_SET_OFFSETS
:
404 /* 06xxxxyyyy (byte offsets) */
405 p_spu
->type
.spu
.i_offset
[0] =
406 GetBits( &p_spudec
->bit_stream
, 16 ) - 4;
408 p_spu
->type
.spu
.i_offset
[1] =
409 GetBits( &p_spudec
->bit_stream
, 16 ) - 4;
423 /* ?? (unknown command) */
424 intf_ErrMsg( "spudec error: unknown command 0x%.2x",
429 } while( i_command
!= SPU_CMD_END
);
431 } while( i_index
== i_next_index
);
433 /* Check that the last index matches the previous one */
434 if( i_next_index
!= i_prev_index
)
436 intf_ErrMsg( "spudec error: index mismatch (0x%.4x != 0x%.4x)",
437 i_next_index
, i_prev_index
);
441 if( i_index
> p_spudec
->i_spu_size
)
443 intf_ErrMsg( "spudec error: uh-oh, we went too far (0x%.4x > 0x%.4x)",
444 i_index
, p_spudec
->i_spu_size
);
448 /* Get rid of padding bytes */
449 switch( p_spudec
->i_spu_size
- i_index
)
453 RemoveBits( &p_spudec
->bit_stream
, 8 );
458 /* Zero or one padding byte, quite usual */
464 /* More than one padding byte - this is very strange, but
465 * we can deal with it */
466 intf_WarnMsg( 2, "spudec warning: %i padding bytes",
467 p_spudec
->i_spu_size
- i_index
);
469 while( i_index
< p_spudec
->i_spu_size
)
471 RemoveBits( &p_spudec
->bit_stream
, 8 );
478 /* Successfully parsed ! */
482 /*****************************************************************************
483 * ParseRLE: parse the RLE part of the subtitle
484 *****************************************************************************
485 * This part parses the subtitle graphical data and stores it in a more
486 * convenient structure for later decoding. For more information on the
487 * subtitles format, see http://sam.zoy.org/doc/dvd/subtitles/index.html
488 *****************************************************************************/
489 static int ParseRLE( u8
*p_src
, subpicture_t
* p_spu
)
492 unsigned int i_id
= 0;
494 unsigned int i_width
= p_spu
->i_width
;
495 unsigned int i_height
= p_spu
->i_height
;
496 unsigned int i_x
, i_y
;
498 u16
*p_dest
= (u16
*)p_spu
->p_data
;
500 /* The subtitles are interlaced, we need two offsets */
501 unsigned int pi_table
[2];
502 unsigned int *pi_offset
;
503 pi_table
[0] = p_spu
->type
.spu
.i_offset
[0] << 1;
504 pi_table
[1] = p_spu
->type
.spu
.i_offset
[1] << 1;
506 for( i_y
= 0 ; i_y
< i_height
; i_y
++ )
508 pi_offset
= pi_table
+ i_id
;
510 for( i_x
= 0 ; i_x
< i_width
; i_x
+= i_code
>> 2 )
512 i_code
= AddNibble( 0, p_src
, pi_offset
);
516 i_code
= AddNibble( i_code
, p_src
, pi_offset
);
520 i_code
= AddNibble( i_code
, p_src
, pi_offset
);
524 i_code
= AddNibble( i_code
, p_src
, pi_offset
);
526 if( i_code
< 0x0100 )
528 /* If the 14 first bits are set to 0, then it's a
529 * new line. We emulate it. */
530 if( i_code
< 0x0004 )
532 i_code
|= ( i_width
- i_x
) << 2;
536 /* We have a boo boo ! */
537 intf_ErrMsg( "spudec error: unknown code %.4x",
546 if( ( (i_code
>> 2) + i_x
+ i_y
* i_width
) > i_height
* i_width
)
548 intf_ErrMsg( "spudec error: out of bounds, %i at (%i,%i) is "
550 i_code
>> 2, i_x
, i_y
, i_width
, i_height
);
554 /* We got a valid code, store it */
558 /* Check that we didn't go too far */
561 intf_ErrMsg( "spudec error: i_x overflowed, %i > %i",
566 /* Byte-align the stream */
567 if( *pi_offset
& 0x1 )
576 /* FIXME: we shouldn't need these padding bytes */
577 while( i_y
< i_height
)
579 *p_dest
++ = i_width
<< 2;