1 /*****************************************************************************
2 * ps.c: Program Stream demux module for VLC.
3 *****************************************************************************
4 * Copyright (C) 2004 the VideoLAN team
7 * Authors: Laurent Aimar <fenrir@via.ecp.fr>
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License as published by
11 * the Free Software Foundation; either version 2 of the License, or
12 * (at your option) any later version.
14 * This program is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 * GNU General Public License for more details.
19 * You should have received a copy of the GNU General Public License
20 * along with this program; if not, write to the Free Software
21 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
22 *****************************************************************************/
24 /*****************************************************************************
26 *****************************************************************************/
29 #include <vlc_demux.h>
34 * - re-add pre-scanning.
38 #define TIME_TEXT N_("Trust MPEG timestamps")
39 #define TIME_LONGTEXT N_("Normally we use the timestamps of the MPEG files " \
40 "to calculate position and duration. However sometimes this might not " \
41 "be usable. Disable this option to calculate from the bitrate instead." )
43 /*****************************************************************************
45 *****************************************************************************/
46 static int OpenForce( vlc_object_t * );
47 static int Open ( vlc_object_t * );
48 static void Close ( vlc_object_t * );
51 set_description( _("MPEG-PS demuxer") );
52 set_category( CAT_INPUT );
53 set_subcategory( SUBCAT_INPUT_DEMUX );
54 set_capability( "demux2", 1 );
55 set_callbacks( OpenForce, Close );
58 add_bool( "ps-trust-timestamps", VLC_TRUE, NULL, TIME_TEXT,
59 TIME_LONGTEXT, VLC_TRUE );
62 set_description( _("MPEG-PS demuxer") );
63 set_capability( "demux2", 8 );
64 set_callbacks( Open, Close );
67 /*****************************************************************************
69 *****************************************************************************/
74 ps_track_t tk[PS_TK_COUNT];
80 int64_t i_current_pts;
82 vlc_bool_t b_lost_sync;
83 vlc_bool_t b_have_pack;
84 vlc_bool_t b_seekable;
87 static int Demux ( demux_t *p_demux );
88 static int Control( demux_t *p_demux, int i_query, va_list args );
90 static int ps_pkt_resynch( stream_t *, uint32_t *pi_code );
91 static block_t *ps_pkt_read ( stream_t *, uint32_t i_code );
93 /*****************************************************************************
95 *****************************************************************************/
96 static int OpenCommon( vlc_object_t *p_this, vlc_bool_t b_force )
98 demux_t *p_demux = (demux_t*)p_this;
103 if( stream_Peek( p_demux->s, &p_peek, 4 ) < 4 )
105 msg_Err( p_demux, "cannot peek" );
109 if( memcmp( p_peek, "\x00\x00\x01", 3 ) || ( p_peek[3] < 0xb9 ) )
114 msg_Warn( p_demux, "this does not look like an MPEG PS stream, "
115 "continuing anyway" );
118 /* Fill p_demux field */
119 p_demux->pf_demux = Demux;
120 p_demux->pf_control = Control;
121 p_demux->p_sys = p_sys = malloc( sizeof( demux_sys_t ) );
124 p_sys->i_mux_rate = 0;
126 p_sys->i_length = -1;
127 p_sys->i_current_pts = (mtime_t) 0;
128 p_sys->i_time_track = -1;
130 p_sys->b_lost_sync = VLC_FALSE;
131 p_sys->b_have_pack = VLC_FALSE;
132 p_sys->b_seekable = VLC_FALSE;
134 stream_Control( p_demux->s, STREAM_CAN_SEEK, &p_sys->b_seekable );
136 ps_psm_init( &p_sys->psm );
137 ps_track_init( p_sys->tk );
139 /* TODO prescanning of ES */
144 static int OpenForce( vlc_object_t *p_this )
146 return OpenCommon( p_this, VLC_TRUE );
149 static int Open( vlc_object_t *p_this )
151 return OpenCommon( p_this, ((demux_t *)p_this)->b_force );
154 /*****************************************************************************
156 *****************************************************************************/
157 static void Close( vlc_object_t *p_this )
159 demux_t *p_demux = (demux_t*)p_this;
160 demux_sys_t *p_sys = p_demux->p_sys;
163 for( i = 0; i < PS_TK_COUNT; i++ )
165 ps_track_t *tk = &p_sys->tk[i];
168 es_format_Clean( &tk->fmt );
169 if( tk->es ) es_out_Del( p_demux->out, tk->es );
173 ps_psm_destroy( &p_sys->psm );
178 static int Demux2( demux_t *p_demux, vlc_bool_t b_end )
180 demux_sys_t *p_sys = p_demux->p_sys;
185 i_ret = ps_pkt_resynch( p_demux->s, &i_code );
190 else if( i_ret == 0 )
192 if( !p_sys->b_lost_sync )
193 msg_Warn( p_demux, "garbage at input, trying to resync..." );
195 p_sys->b_lost_sync = VLC_TRUE;
199 if( p_sys->b_lost_sync ) msg_Warn( p_demux, "found sync code" );
200 p_sys->b_lost_sync = VLC_FALSE;
202 if( ( p_pkt = ps_pkt_read( p_demux->s, i_code ) ) == NULL )
206 if( (i_id = ps_pkt_id( p_pkt )) >= 0xc0 )
208 ps_track_t *tk = &p_sys->tk[PS_ID_TO_TK(i_id)];
209 if( !ps_pkt_parse_pes( p_pkt, tk->i_skip ) )
211 if( b_end && p_pkt->i_pts > tk->i_last_pts )
213 tk->i_last_pts = p_pkt->i_pts;
215 else if ( tk->i_first_pts == -1 )
217 tk->i_first_pts = p_pkt->i_pts;
221 block_Release( p_pkt );
225 static void FindLength( demux_t *p_demux )
227 demux_sys_t *p_sys = p_demux->p_sys;
228 int64_t i_current_pos = -1, i_size = 0, i_end = 0;
231 if( !var_CreateGetInteger( p_demux, "ps-trust-timestamps" ) )
234 if( p_sys->i_length == -1 ) /* First time */
237 /* Check beginning */
239 i_current_pos = stream_Tell( p_demux->s );
240 while( !p_demux->b_die && i < 40 && Demux2( p_demux, VLC_FALSE ) > 0 ) i++;
243 i_size = stream_Size( p_demux->s );
244 i_end = __MAX( 0, __MIN( 200000, i_size ) );
245 stream_Seek( p_demux->s, i_size - i_end );
247 while( !p_demux->b_die && Demux2( p_demux, VLC_TRUE ) > 0 );
248 if( i_current_pos >= 0 ) stream_Seek( p_demux->s, i_current_pos );
251 for( i = 0; i < PS_TK_COUNT; i++ )
253 ps_track_t *tk = &p_sys->tk[i];
254 if( tk->i_first_pts >= 0 && tk->i_last_pts > 0 )
255 if( tk->i_last_pts > tk->i_first_pts )
257 int64_t i_length = (int64_t)tk->i_last_pts - tk->i_first_pts;
258 if( i_length > p_sys->i_length )
260 p_sys->i_length = i_length;
261 p_sys->i_time_track = i;
262 msg_Dbg( p_demux, "we found a length of: %lld", p_sys->i_length );
268 /*****************************************************************************
270 *****************************************************************************/
271 static int Demux( demux_t *p_demux )
273 demux_sys_t *p_sys = p_demux->p_sys;
274 int i_ret, i_id, i_mux_rate;
278 i_ret = ps_pkt_resynch( p_demux->s, &i_code );
283 else if( i_ret == 0 )
285 if( !p_sys->b_lost_sync )
286 msg_Warn( p_demux, "garbage at input, trying to resync..." );
288 p_sys->b_lost_sync = VLC_TRUE;
292 if( p_sys->b_lost_sync ) msg_Warn( p_demux, "found sync code" );
293 p_sys->b_lost_sync = VLC_FALSE;
295 if( p_sys->i_length < 0 && p_sys->b_seekable )
296 FindLength( p_demux );
298 if( ( p_pkt = ps_pkt_read( p_demux->s, i_code ) ) == NULL )
306 block_Release( p_pkt );
310 if( !ps_pkt_parse_pack( p_pkt, &p_sys->i_scr, &i_mux_rate ) )
312 if( !p_sys->b_have_pack ) p_sys->b_have_pack = VLC_TRUE;
313 /* done later on to work around bad vcd/svcd streams */
314 /* es_out_Control( p_demux->out, ES_OUT_SET_PCR, p_sys->i_scr ); */
315 if( i_mux_rate > 0 ) p_sys->i_mux_rate = i_mux_rate;
317 block_Release( p_pkt );
321 if( !ps_pkt_parse_system( p_pkt, &p_sys->psm, p_sys->tk ) )
324 for( i = 0; i < PS_TK_COUNT; i++ )
326 ps_track_t *tk = &p_sys->tk[i];
328 if( tk->b_seen && !tk->es && tk->fmt.i_cat != UNKNOWN_ES )
330 tk->es = es_out_Add( p_demux->out, &tk->fmt );
334 block_Release( p_pkt );
338 if( p_sys->psm.i_version == 0xFFFF )
339 msg_Dbg( p_demux, "contains a PSM");
341 ps_psm_fill( &p_sys->psm, p_pkt, p_sys->tk, p_demux->out );
342 block_Release( p_pkt );
346 if( (i_id = ps_pkt_id( p_pkt )) >= 0xc0 )
348 vlc_bool_t b_new = VLC_FALSE;
349 ps_track_t *tk = &p_sys->tk[PS_ID_TO_TK(i_id)];
353 if( !ps_track_fill( tk, &p_sys->psm, i_id ) )
355 tk->es = es_out_Add( p_demux->out, &tk->fmt );
360 msg_Dbg( p_demux, "es id=0x%x format unknown", i_id );
362 tk->b_seen = VLC_TRUE;
365 /* The popular VCD/SVCD subtitling WinSubMux does not
366 * renumber the SCRs when merging subtitles into the PES */
368 ( tk->fmt.i_codec == VLC_FOURCC('o','g','t',' ') ||
369 tk->fmt.i_codec == VLC_FOURCC('c','v','d',' ') ) )
374 if( p_sys->i_scr > 0 )
375 es_out_Control( p_demux->out, ES_OUT_SET_PCR, p_sys->i_scr );
379 if( tk->b_seen && tk->es &&
380 !ps_pkt_parse_pes( p_pkt, tk->i_skip ) )
382 if( !b_new && !p_sys->b_have_pack && tk->fmt.i_cat == AUDIO_ES && p_pkt->i_pts > 0 )
384 /* A hack to sync the A/V on PES files. */
385 msg_Dbg( p_demux, "force SCR: %lld", p_pkt->i_pts );
386 es_out_Control( p_demux->out, ES_OUT_SET_PCR, p_pkt->i_pts );
389 if( (int64_t)p_pkt->i_pts > p_sys->i_current_pts )
391 p_sys->i_current_pts = (int64_t)p_pkt->i_pts;
394 es_out_Send( p_demux->out, tk->es, p_pkt );
398 block_Release( p_pkt );
403 block_Release( p_pkt );
411 /*****************************************************************************
413 *****************************************************************************/
414 static int Control( demux_t *p_demux, int i_query, va_list args )
416 demux_sys_t *p_sys = p_demux->p_sys;
422 case DEMUX_GET_POSITION:
423 pf = (double*) va_arg( args, double* );
424 i64 = stream_Size( p_demux->s );
427 *pf = (double)stream_Tell( p_demux->s ) / (double)i64;
435 case DEMUX_SET_POSITION:
436 f = (double) va_arg( args, double );
437 i64 = stream_Size( p_demux->s );
438 p_sys->i_current_pts = 0;
439 es_out_Control( p_demux->out, ES_OUT_RESET_PCR );
441 return stream_Seek( p_demux->s, (int64_t)(i64 * f) );
444 pi64 = (int64_t*)va_arg( args, int64_t * );
445 if( p_sys->i_time_track >= 0 && p_sys->i_current_pts > 0 )
447 *pi64 = p_sys->i_current_pts - p_sys->tk[p_sys->i_time_track].i_first_pts;
450 if( p_sys->i_mux_rate > 0 )
452 *pi64 = (int64_t)1000000 * ( stream_Tell( p_demux->s ) / 50 ) /
459 case DEMUX_GET_LENGTH:
460 pi64 = (int64_t*)va_arg( args, int64_t * );
461 if( p_sys->i_length > 0 )
463 *pi64 = p_sys->i_length;
466 else if( p_sys->i_mux_rate > 0 )
468 *pi64 = (int64_t)1000000 * ( stream_Size( p_demux->s ) / 50 ) /
476 i64 = (int64_t)va_arg( args, int64_t );
477 if( p_sys->i_time_track >= 0 && p_sys->i_current_pts > 0 )
479 int64_t i_now = p_sys->i_current_pts - p_sys->tk[p_sys->i_time_track].i_first_pts;
480 int64_t i_pos = stream_Tell( p_demux->s );
481 int64_t i_offset = i_pos / (i_now / 1000000) * ((i64 - i_now) / 1000000);
482 stream_Seek( p_demux->s, i_pos + i_offset);
484 es_out_Control( p_demux->out, ES_OUT_RESET_PCR );
495 /*****************************************************************************
497 *****************************************************************************/
499 /* PSResynch: resynch on a system startcode
500 * It doesn't skip more than 512 bytes
501 * -1 -> error, 0 -> not synch, 1 -> ok
503 static int ps_pkt_resynch( stream_t *s, uint32_t *pi_code )
509 if( stream_Peek( s, &p_peek, 4 ) < 4 )
513 if( p_peek[0] == 0 && p_peek[1] == 0 && p_peek[2] == 1 &&
516 *pi_code = 0x100 | p_peek[3];
520 if( ( i_peek = stream_Peek( s, &p_peek, 512 ) ) < 4 )
532 if( p_peek[0] == 0 && p_peek[1] == 0 && p_peek[2] == 1 &&
535 *pi_code = 0x100 | p_peek[3];
536 return stream_Read( s, NULL, i_skip ) == i_skip ? 1 : -1;
543 return stream_Read( s, NULL, i_skip ) == i_skip ? 0 : -1;
546 static block_t *ps_pkt_read( stream_t *s, uint32_t i_code )
549 int i_peek = stream_Peek( s, &p_peek, 14 );
550 int i_size = ps_pkt_size( p_peek, i_peek );
552 if( i_size <= 6 && p_peek[3] > 0xba )
554 /* Special case, search the next start code */
558 i_peek = stream_Peek( s, &p_peek, i_size + 1024 );
559 if( i_peek <= i_size + 4 )
563 while( i_size <= i_peek - 4 )
565 if( p_peek[i_size] == 0x00 && p_peek[i_size+1] == 0x00 &&
566 p_peek[i_size+2] == 0x01 && p_peek[i_size+3] >= 0xb9 )
568 return stream_Block( s, i_size );
577 return stream_Block( s, i_size );