1 /*****************************************************************************
2 * generic_decoder.c : generic decoder thread
3 * This decoder provides a way to parse packets which do not belong to any
4 * known stream type, or to redirect packets to files. It can extract PES files
5 * from a multiplexed stream, identify automatically ES in a stream missing
6 * stream informations (i.e. a TS stream without PSI) and update ES tables in
7 * its input thread, or just print informations about what it receives in DEBUG
9 * A single generic decoder is able to handle several ES, therefore it can be
10 * used as a 'default' decoder by the input thread.
11 *****************************************************************************
12 * Copyright (C) 1998, 1999, 2000 VideoLAN
16 * This program is free software; you can redistribute it and/or modify
17 * it under the terms of the GNU General Public License as published by
18 * the Free Software Foundation; either version 2 of the License, or
19 * (at your option) any later version.
21 * This program is distributed in the hope that it will be useful,
22 * but WITHOUT ANY WARRANTY; without even the implied warranty of
23 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
24 * General Public License for more details.
26 * You should have received a copy of the GNU General Public
27 * License along with this program; if not, write to the
28 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
29 * Boston, MA 02111-1307, USA.
30 *****************************************************************************/
32 /*****************************************************************************
34 *****************************************************************************/
39 #include <sys/types.h>
40 #include <sys/socket.h>
41 #include <netinet/in.h>
42 #include <sys/types.h> /* on BSD, uio.h needs types.h */
55 #include "input_netlist.h"
56 #include "decoder_fifo.h"
58 #include "generic_decoder.h"
63 static int CheckConfiguration ( gdec_cfg_t *p_cfg );
64 static int InitThread ( gdec_thread_t *p_gdec );
65 static void RunThread ( gdec_thread_t *p_gdec );
66 static void ErrorThread ( gdec_thread_t *p_gdec );
67 static void EndThread ( gdec_thread_t *p_gdec );
69 static void IdentifyPES ( gdec_thread_t *p_gdec, pes_packet_t *p_pes,
71 static void PrintPES ( pes_packet_t *p_pes, int i_stream_id );
73 /*****************************************************************************
74 * gdec_CreateThread: create a generic decoder thread
75 *****************************************************************************
76 * This function creates a new generic decoder thread, and returns a pointer
77 * to its description. On error, it returns NULL.
78 * Following configuration properties are used:
79 * GDEC_CFG_ACTIONS (required)
81 *****************************************************************************/
82 gdec_thread_t * gdec_CreateThread( gdec_cfg_t *p_cfg, input_thread_t *p_input,
85 gdec_thread_t * p_gdec; /* thread descriptor */
86 int i_status; /* thread status */
91 if( CheckConfiguration( p_cfg ) )
96 /* Allocate descriptor and initialize flags */
97 p_gdec = (gdec_thread_t *) malloc( sizeof(gdec_thread_t) );
98 if( p_gdec == NULL ) /* error */
103 /* Copy configuration */
104 p_gdec->i_actions = p_cfg->i_actions;
108 p_gdec->pi_status = (pi_status != NULL) ? pi_status : &i_status;
109 *p_gdec->pi_status = THREAD_CREATE;
111 /* Initialize flags */
114 p_gdec->b_active = 1;
117 if( vlc_thread_create( &p_gdec->thread_id, "generic decoder", (vlc_thread_func)RunThread, (void *) p_gdec) )
119 intf_ErrMsg("gdec error: %s\n", strerror(ENOMEM));
120 intf_DbgMsg("failed\n");
125 /* If status is NULL, wait until the thread is created */
126 if( pi_status == NULL )
130 msleep( THREAD_SLEEP );
131 }while( (i_status != THREAD_READY) && (i_status != THREAD_ERROR)
132 && (i_status != THREAD_FATAL) );
133 if( i_status != THREAD_READY )
135 intf_DbgMsg("failed\n");
140 intf_DbgMsg("succeeded -> %p\n", p_gdec);
144 /*****************************************************************************
145 * gdec_DestroyThread: destroy a generic decoder thread
146 *****************************************************************************
147 * Destroy a terminated thread. This function will return 0 if the thread could
148 * be destroyed, and non 0 else. The last case probably means that the thread
149 * was still active, and another try may succeed.
150 *****************************************************************************/
151 void gdec_DestroyThread( gdec_thread_t *p_gdec, int *pi_status )
153 int i_status; /* thread status */
156 p_gdec->pi_status = (pi_status != NULL) ? pi_status : &i_status;
157 *p_gdec->pi_status = THREAD_DESTROY;
159 /* Request thread destruction */
161 /* Make sure the decoder thread leaves the GetByte() function */
162 vlc_mutex_lock( &(p_gdec->fifo.data_lock) );
163 vlc_cond_signal( &(p_gdec->fifo.data_wait) );
164 vlc_mutex_unlock( &(p_gdec->fifo.data_lock) );
166 /* If status is NULL, wait until thread has been destroyed */
171 msleep( THREAD_SLEEP );
172 }while( (i_status != THREAD_OVER) && (i_status != THREAD_ERROR)
173 && (i_status != THREAD_FATAL) );
176 intf_DbgMsg("%p -> succeeded\n", p_gdec);
179 /* following functions are local */
181 /*****************************************************************************
182 * CheckConfiguration: check gdec_CreateThread() configuration
183 *****************************************************************************
184 * Set default parameters where required. In DEBUG mode, check if configuration
186 *****************************************************************************/
187 static int CheckConfiguration( gdec_cfg_t *p_cfg )
190 /* Actions (required) */
191 if( !(p_cfg->i_properties & GDEC_CFG_ACTIONS) )
200 /*****************************************************************************
201 * InitThread: initialize gdec thread
202 *****************************************************************************
203 * This function is called from RunThread and performs the second step of the
204 * initialization. It returns 0 on success. Note that the thread's flag are not
205 * modified inside this function.
206 *****************************************************************************/
207 static int InitThread( gdec_thread_t *p_gdec )
212 *p_gdec->pi_status = THREAD_START;
214 /* Initialize other properties */
217 p_gdec->c_idle_loops = 0;
221 /* Mark thread as running and return */
222 *p_gdec->pi_status = THREAD_READY;
223 intf_DbgMsg("%p -> succeeded\n", p_gdec);
227 /*****************************************************************************
228 * RunThread: generic decoder thread
229 *****************************************************************************
230 * Generic decoder thread. This function does only returns when the thread is
232 *****************************************************************************/
233 static void RunThread( gdec_thread_t *p_gdec )
235 pes_packet_t * p_pes; /* current packet */
236 int i_stream_id; /* PES stream id */
239 * Initialize thread and free configuration
241 p_gdec->b_error = InitThread( p_gdec );
242 if( p_gdec->b_error )
244 free( p_gdec ); /* destroy descriptor */
249 * Main loop - it is not executed if an error occured during
252 while( (!p_gdec->b_die) && (!p_gdec->b_error) )
254 /* FIXME: locks à rajouter ?? - vérifier les macros (transformer en inline ?) */
255 /* on idle loop, increment c_idle_loops */
256 while( !DECODER_FIFO_ISEMPTY( p_gdec->fifo ) )
258 p_pes = DECODER_FIFO_START( p_gdec->fifo );
259 DECODER_FIFO_INCSTART( p_gdec->fifo );
261 /* Extract stream id from packet if required - stream id is used
262 * by GDEC_IDENTIFY, GDEC_SAVE_DEMUX and GDEC_PRINT */
263 if( p_gdec->i_actions & (GDEC_IDENTIFY | GDEC_SAVE_DEMUX | GDEC_PRINT) )
265 i_stream_id = p_pes->p_pes_header[3];
268 /* PES identification */
269 if( p_gdec->i_actions & GDEC_IDENTIFY )
271 IdentifyPES( p_gdec, p_pes, i_stream_id );
274 /* PES multiplexed stream saving */
275 if( p_gdec->i_actions & GDEC_SAVE )
280 /* PES demultiplexed stream saving */
281 if( p_gdec->i_actions & GDEC_SAVE_DEMUX )
286 /* PES information printing */
287 if( p_gdec->i_actions & GDEC_PRINT )
289 PrintPES( p_pes, i_stream_id );
292 /* Trash PES packet (give it back to fifo) */
293 input_NetlistFreePES( p_gdec->p_input, p_pes );
307 if( p_gdec->b_error )
309 ErrorThread( p_gdec );
316 /*****************************************************************************
317 * ErrorThread: RunThread() error loop
318 *****************************************************************************
319 * This function is called when an error occured during thread main's loop. The
320 * thread can still receive feed, but must be ready to terminate as soon as
322 *****************************************************************************/
323 static void ErrorThread( gdec_thread_t *p_gdec )
325 pes_packet_t * p_pes; /* pes packet */
327 /* Wait until a `die' order */
328 while( !p_gdec->b_die )
330 /* Trash all received PES packets */
331 while( !DECODER_FIFO_ISEMPTY( p_gdec->fifo ) )
333 p_pes = DECODER_FIFO_START( p_gdec->fifo );
334 DECODER_FIFO_INCSTART( p_gdec->fifo );
335 input_NetlistFreePES( p_gdec->p_input, p_pes );
339 msleep( GDEC_IDLE_SLEEP );
343 /*****************************************************************************
344 * EndThread: thread destruction
345 *****************************************************************************
346 * This function is called when the thread ends after a sucessfull
348 *****************************************************************************/
349 static void EndThread( gdec_thread_t *p_gdec )
351 int * pi_status; /* thread status */
354 pi_status = p_gdec->pi_status;
355 *pi_status = THREAD_END;
358 /* Check for remaining PES packets */
362 /* Destroy thread structures allocated by InitThread */
363 free( p_gdec ); /* destroy descriptor */
365 *pi_status = THREAD_OVER;
366 intf_DbgMsg("%p\n", p_gdec);
369 /*****************************************************************************
370 * IdentifyPES: identify a PES packet
371 *****************************************************************************
372 * Update ES tables in the input thread according to the stream_id value. See
373 * ISO 13818-1, table 2-18.
374 *****************************************************************************/
375 static void IdentifyPES( gdec_thread_t *p_gdec, pes_packet_t *p_pes, int i_stream_id )
377 int i_id; /* stream id in es table */
378 int i_type; /* stream type according ISO/IEC 13818-1 table 2-29 */
380 /* Search where the elementary stream id does come from */
381 switch( p_gdec->p_input->i_method )
383 case INPUT_METHOD_TS_FILE: /* TS methods: id is TS PID */
384 case INPUT_METHOD_TS_UCAST:
385 case INPUT_METHOD_TS_BCAST:
386 case INPUT_METHOD_TS_VLAN_BCAST:
387 /* XXX?? since PID is extracted by demux, it could be usefull to store it
388 * in a readable place, i.e. the TS packet descriptor, rather than to
389 * re-extract it now */
390 i_id = U16_AT(&p_pes->p_first_ts->buffer[1]) & 0x1fff;
394 default: /* unknown id origin */
395 intf_DbgMsg("unable to identify PES using input method %d\n",
396 p_gdec->p_input->i_method );
401 /* Try to identify PES stream_id - see ISO 13818-1 table 2-18 */
402 if( i_stream_id == 0xbd )
404 /* Dolby AC-3 stream - might be specific to DVD PS streams */
405 i_type = MPEG2_AUDIO_ES;
406 intf_DbgMsg("PES %p identified as AUDIO AC3\n", p_pes);
408 else if( (i_stream_id & 0xe0) == 0xc0 )
410 /* ISO/IEC 13818-3 or ISO/IEC 11172-3 audio stream - since there is no
411 * way to make the difference between the two possibilities, and since
412 * an ISO/IEC 13818-3 is capable of decoding an ISO/IEC 11172-3 stream,
413 * the first one is used */
414 i_type = MPEG2_AUDIO_ES;
415 intf_DbgMsg("PES %p identified as AUDIO MPEG\n", p_pes);
417 else if( (i_stream_id & 0xf0) == 0xe0 )
419 /* ISO/IEC 13818-2 or ISO/IEC 11172-2 video stream - since there is no
420 * way to make the difference between the two possibilities, and since
421 * an ISO/IEC 13818-2 is capable of decoding an ISO/IEC 11172-2 stream,
422 * the first one is used */
423 i_type = MPEG2_VIDEO_ES;
424 intf_DbgMsg("PES %p identified as VIDEO\n", p_pes);
428 /* The stream could not be identified - just return */
429 intf_DbgMsg("PES %p could not be identified\n", p_pes);
433 /* Update ES table */
437 /*****************************************************************************
438 * PrintPES: print informations about a PES packet
439 *****************************************************************************
440 * This function will print information about a received PES packet. It is
441 * probably usefull only for debugging purposes, or before demultiplexing a
442 * stream. It has two different formats, depending of the presence of the DEBUG
444 *****************************************************************************/
445 static void PrintPES( pes_packet_t *p_pes, int i_stream_id )
447 char psz_pes[128]; /* descriptor buffer */
450 /* PES informations, long (DEBUG) format - this string is maximum 70 bytes
452 sprintf(psz_pes, "id 0x%x, %d bytes (%d TS): %p %c%c%c%c",
453 i_stream_id, p_pes->i_pes_size, p_pes->i_ts_packets,
455 p_pes->b_data_loss ? 'l' : '-', p_pes->b_data_alignment ? 'a' : '-',
456 p_pes->b_random_access ? 'r' : '-', p_pes->b_discard_payload ? 'd' : '-' );
458 /* PES informations, short format */
459 sprintf(psz_pes, "id 0x%x, %d bytes",
460 i_stream_id, p_pes->i_pes_size );
462 intf_Msg("gdec: PES %s\n", psz_pes );