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
14 * Authors: Vincent Seguin <seguin@via.ecp.fr>
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
24 * GNU General Public License for more details.
26 * You should have received a copy of the GNU General Public License
27 * along with this program; if not, write to the Free Software
28 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111, USA.
29 *****************************************************************************/
31 /*****************************************************************************
33 *****************************************************************************/
40 #include <sys/types.h>
41 #include <sys/socket.h>
53 #include "input_netlist.h"
54 #include "decoder_fifo.h"
56 #include "generic_decoder.h"
61 static int CheckConfiguration ( gdec_cfg_t *p_cfg );
62 static int InitThread ( gdec_thread_t *p_gdec );
63 static void RunThread ( gdec_thread_t *p_gdec );
64 static void ErrorThread ( gdec_thread_t *p_gdec );
65 static void EndThread ( gdec_thread_t *p_gdec );
67 static void IdentifyPES ( gdec_thread_t *p_gdec, pes_packet_t *p_pes,
69 static void PrintPES ( pes_packet_t *p_pes, int i_stream_id );
71 /*****************************************************************************
72 * gdec_CreateThread: create a generic decoder thread
73 *****************************************************************************
74 * This function creates a new generic decoder thread, and returns a pointer
75 * to its description. On error, it returns NULL.
76 * Following configuration properties are used:
77 * GDEC_CFG_ACTIONS (required)
79 *****************************************************************************/
80 gdec_thread_t * gdec_CreateThread( gdec_cfg_t *p_cfg, input_thread_t *p_input,
83 gdec_thread_t * p_gdec; /* thread descriptor */
84 int i_status; /* thread status */
89 if( CheckConfiguration( p_cfg ) )
94 /* Allocate descriptor and initialize flags */
95 p_gdec = (gdec_thread_t *) malloc( sizeof(gdec_thread_t) );
96 if( p_gdec == NULL ) /* error */
101 /* Copy configuration */
102 p_gdec->i_actions = p_cfg->i_actions;
106 p_gdec->pi_status = (pi_status != NULL) ? pi_status : &i_status;
107 *p_gdec->pi_status = THREAD_CREATE;
109 /* Initialize flags */
112 p_gdec->b_active = 1;
115 if( vlc_thread_create( &p_gdec->thread_id, "generic decoder", (vlc_thread_func)RunThread, (void *) p_gdec) )
117 intf_ErrMsg("gdec error: %s", strerror(ENOMEM));
118 intf_DbgMsg("failed");
123 /* If status is NULL, wait until the thread is created */
124 if( pi_status == NULL )
128 msleep( THREAD_SLEEP );
129 }while( (i_status != THREAD_READY) && (i_status != THREAD_ERROR)
130 && (i_status != THREAD_FATAL) );
131 if( i_status != THREAD_READY )
133 intf_DbgMsg("failed");
138 intf_DbgMsg("succeeded -> %p", p_gdec);
142 /*****************************************************************************
143 * gdec_DestroyThread: destroy a generic decoder thread
144 *****************************************************************************
145 * Destroy a terminated thread. This function will return 0 if the thread could
146 * be destroyed, and non 0 else. The last case probably means that the thread
147 * was still active, and another try may succeed.
148 *****************************************************************************/
149 void gdec_DestroyThread( gdec_thread_t *p_gdec, int *pi_status )
151 int i_status; /* thread status */
154 p_gdec->pi_status = (pi_status != NULL) ? pi_status : &i_status;
155 *p_gdec->pi_status = THREAD_DESTROY;
157 /* Request thread destruction */
159 /* Make sure the decoder thread leaves the GetByte() function */
160 vlc_mutex_lock( &(p_gdec->fifo.data_lock) );
161 vlc_cond_signal( &(p_gdec->fifo.data_wait) );
162 vlc_mutex_unlock( &(p_gdec->fifo.data_lock) );
164 /* If status is NULL, wait until thread has been destroyed */
169 msleep( THREAD_SLEEP );
170 }while( (i_status != THREAD_OVER) && (i_status != THREAD_ERROR)
171 && (i_status != THREAD_FATAL) );
174 intf_DbgMsg("%p -> succeeded", p_gdec);
177 /* following functions are local */
179 /*****************************************************************************
180 * CheckConfiguration: check gdec_CreateThread() configuration
181 *****************************************************************************
182 * Set default parameters where required. In DEBUG mode, check if configuration
184 *****************************************************************************/
185 static int CheckConfiguration( gdec_cfg_t *p_cfg )
188 /* Actions (required) */
189 if( !(p_cfg->i_properties & GDEC_CFG_ACTIONS) )
198 /*****************************************************************************
199 * InitThread: initialize gdec thread
200 *****************************************************************************
201 * This function is called from RunThread and performs the second step of the
202 * initialization. It returns 0 on success. Note that the thread's flag are not
203 * modified inside this function.
204 *****************************************************************************/
205 static int InitThread( gdec_thread_t *p_gdec )
210 *p_gdec->pi_status = THREAD_START;
212 /* Initialize other properties */
215 p_gdec->c_idle_loops = 0;
219 /* Mark thread as running and return */
220 *p_gdec->pi_status = THREAD_READY;
221 intf_DbgMsg("%p -> succeeded", p_gdec);
225 /*****************************************************************************
226 * RunThread: generic decoder thread
227 *****************************************************************************
228 * Generic decoder thread. This function does only returns when the thread is
230 *****************************************************************************/
231 static void RunThread( gdec_thread_t *p_gdec )
233 pes_packet_t * p_pes; /* current packet */
234 int i_stream_id; /* PES stream id */
237 * Initialize thread and free configuration
239 p_gdec->b_error = InitThread( p_gdec );
240 if( p_gdec->b_error )
242 free( p_gdec ); /* destroy descriptor */
247 * Main loop - it is not executed if an error occured during
250 while( (!p_gdec->b_die) && (!p_gdec->b_error) )
252 /* FIXME: locks à rajouter ?? - vérifier les macros (transformer en inline ?) */
253 /* on idle loop, increment c_idle_loops */
254 while( !DECODER_FIFO_ISEMPTY( p_gdec->fifo ) )
256 p_pes = DECODER_FIFO_START( p_gdec->fifo );
257 DECODER_FIFO_INCSTART( p_gdec->fifo );
259 /* Extract stream id from packet if required - stream id is used
260 * by GDEC_IDENTIFY, GDEC_SAVE_DEMUX and GDEC_PRINT */
261 if( p_gdec->i_actions & (GDEC_IDENTIFY | GDEC_SAVE_DEMUX | GDEC_PRINT) )
263 i_stream_id = p_pes->p_pes_header[3];
266 /* PES identification */
267 if( p_gdec->i_actions & GDEC_IDENTIFY )
269 IdentifyPES( p_gdec, p_pes, i_stream_id );
272 /* PES multiplexed stream saving */
273 if( p_gdec->i_actions & GDEC_SAVE )
278 /* PES demultiplexed stream saving */
279 if( p_gdec->i_actions & GDEC_SAVE_DEMUX )
284 /* PES information printing */
285 if( p_gdec->i_actions & GDEC_PRINT )
287 PrintPES( p_pes, i_stream_id );
290 /* Trash PES packet (give it back to fifo) */
291 input_NetlistFreePES( p_gdec->p_input, p_pes );
305 if( p_gdec->b_error )
307 ErrorThread( p_gdec );
314 /*****************************************************************************
315 * ErrorThread: RunThread() error loop
316 *****************************************************************************
317 * This function is called when an error occured during thread main's loop. The
318 * thread can still receive feed, but must be ready to terminate as soon as
320 *****************************************************************************/
321 static void ErrorThread( gdec_thread_t *p_gdec )
323 pes_packet_t * p_pes; /* pes packet */
325 /* Wait until a `die' order */
326 while( !p_gdec->b_die )
328 /* Trash all received PES packets */
329 while( !DECODER_FIFO_ISEMPTY( p_gdec->fifo ) )
331 p_pes = DECODER_FIFO_START( p_gdec->fifo );
332 DECODER_FIFO_INCSTART( p_gdec->fifo );
333 input_NetlistFreePES( p_gdec->p_input, p_pes );
337 msleep( GDEC_IDLE_SLEEP );
341 /*****************************************************************************
342 * EndThread: thread destruction
343 *****************************************************************************
344 * This function is called when the thread ends after a sucessful
346 *****************************************************************************/
347 static void EndThread( gdec_thread_t *p_gdec )
349 int * pi_status; /* thread status */
352 pi_status = p_gdec->pi_status;
353 *pi_status = THREAD_END;
356 /* Check for remaining PES packets */
360 /* Destroy thread structures allocated by InitThread */
361 free( p_gdec ); /* destroy descriptor */
363 *pi_status = THREAD_OVER;
364 intf_DbgMsg("%p", p_gdec);
367 /*****************************************************************************
368 * IdentifyPES: identify a PES packet
369 *****************************************************************************
370 * Update ES tables in the input thread according to the stream_id value. See
371 * ISO 13818-1, table 2-18.
372 *****************************************************************************/
373 static void IdentifyPES( gdec_thread_t *p_gdec, pes_packet_t *p_pes, int i_stream_id )
375 int i_id; /* stream id in es table */
376 int i_type; /* stream type according ISO/IEC 13818-1 table 2-29 */
378 /* Search where the elementary stream id does come from */
379 switch( p_gdec->p_input->i_method )
381 case INPUT_METHOD_TS_FILE: /* TS methods: id is TS PID */
382 case INPUT_METHOD_TS_UCAST:
383 case INPUT_METHOD_TS_BCAST:
384 case INPUT_METHOD_TS_VLAN_BCAST:
385 /* XXX?? since PID is extracted by demux, it could be useful to store it
386 * in a readable place, i.e. the TS packet descriptor, rather than to
387 * re-extract it now */
388 i_id = U16_AT(&p_pes->p_first_ts->buffer[1]) & 0x1fff;
392 default: /* unknown id origin */
393 intf_DbgMsg("unable to identify PES using input method %d",
394 p_gdec->p_input->i_method );
399 /* Try to identify PES stream_id - see ISO 13818-1 table 2-18 */
400 if( i_stream_id == 0xbd )
402 /* Dolby AC-3 stream - might be specific to DVD PS streams */
403 i_type = MPEG2_AUDIO_ES;
404 intf_DbgMsg("PES %p identified as AUDIO AC3", p_pes);
406 else if( (i_stream_id & 0xe0) == 0xc0 )
408 /* ISO/IEC 13818-3 or ISO/IEC 11172-3 audio stream - since there is no
409 * way to make the difference between the two possibilities, and since
410 * an ISO/IEC 13818-3 is capable of decoding an ISO/IEC 11172-3 stream,
411 * the first one is used */
412 i_type = MPEG2_AUDIO_ES;
413 intf_DbgMsg("PES %p identified as AUDIO MPEG", p_pes);
415 else if( (i_stream_id & 0xf0) == 0xe0 )
417 /* ISO/IEC 13818-2 or ISO/IEC 11172-2 video stream - since there is no
418 * way to make the difference between the two possibilities, and since
419 * an ISO/IEC 13818-2 is capable of decoding an ISO/IEC 11172-2 stream,
420 * the first one is used */
421 i_type = MPEG2_VIDEO_ES;
422 intf_DbgMsg("PES %p identified as VIDEO", p_pes);
426 /* The stream could not be identified - just return */
427 intf_DbgMsg("PES %p could not be identified", p_pes);
431 /* Update ES table */
435 /*****************************************************************************
436 * PrintPES: print informations about a PES packet
437 *****************************************************************************
438 * This function will print information about a received PES packet. It is
439 * probably useful only for debugging purposes, or before demultiplexing a
440 * stream. It has two different formats, depending of the presence of the DEBUG
442 *****************************************************************************/
443 static void PrintPES( pes_packet_t *p_pes, int i_stream_id )
445 char psz_pes[128]; /* descriptor buffer */
448 /* PES informations, long (DEBUG) format - this string is maximum 70 bytes
450 sprintf(psz_pes, "id 0x%x, %d bytes (%d TS): %p %c%c%c%c",
451 i_stream_id, p_pes->i_pes_size, p_pes->i_ts_packets,
453 p_pes->b_data_loss ? 'l' : '-', p_pes->b_data_alignment ? 'a' : '-',
454 p_pes->b_random_access ? 'r' : '-', p_pes->b_discard_payload ? 'd' : '-' );
456 /* PES informations, short format */
457 sprintf(psz_pes, "id 0x%x, %d bytes",
458 i_stream_id, p_pes->i_pes_size );
460 intf_Msg("gdec: PES %s", psz_pes );