1 /*****************************************************************************
2 * ps.c: Program Stream demux module for VLC.
3 *****************************************************************************
4 * Copyright (C) 2004-2009 VLC authors and VideoLAN
7 * Authors: Laurent Aimar <fenrir@via.ecp.fr>
9 * This program is free software; you can redistribute it and/or modify it
10 * under the terms of the GNU Lesser General Public License as published by
11 * the Free Software Foundation; either version 2.1 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 Lesser General Public License for more details.
19 * You should have received a copy of the GNU Lesser General Public License
20 * along with this program; if not, write to the Free Software Foundation,
21 * Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
22 *****************************************************************************/
24 /*****************************************************************************
26 *****************************************************************************/
32 #include <vlc_common.h>
33 #include <vlc_plugin.h>
34 #include <vlc_demux.h>
39 * - re-add pre-scanning.
43 #define TIME_TEXT N_("Trust MPEG timestamps")
44 #define TIME_LONGTEXT N_("Normally we use the timestamps of the MPEG files " \
45 "to calculate position and duration. However sometimes this might not " \
46 "be usable. Disable this option to calculate from the bitrate instead." )
48 /*****************************************************************************
50 *****************************************************************************/
51 static int OpenForce( vlc_object_t * );
52 static int Open ( vlc_object_t * );
53 static void Close ( vlc_object_t * );
56 set_description( N_("MPEG-PS demuxer") )
57 set_shortname( N_("PS") )
58 set_category( CAT_INPUT )
59 set_subcategory( SUBCAT_INPUT_DEMUX )
60 set_capability( "demux", 1 )
61 set_callbacks( OpenForce, Close )
64 add_bool( "ps-trust-timestamps", true, TIME_TEXT,
69 set_description( N_("MPEG-PS demuxer") )
70 set_capability( "demux", 8 )
71 set_callbacks( Open, Close )
75 /*****************************************************************************
77 *****************************************************************************/
82 ps_track_t tk[PS_TK_COUNT];
89 int64_t i_current_pts;
98 static int Demux ( demux_t *p_demux );
99 static int Control( demux_t *p_demux, int i_query, va_list args );
101 static int ps_pkt_resynch( stream_t *, uint32_t *pi_code );
102 static block_t *ps_pkt_read ( stream_t *, uint32_t i_code );
104 /*****************************************************************************
106 *****************************************************************************/
107 static int OpenCommon( vlc_object_t *p_this, bool b_force )
109 demux_t *p_demux = (demux_t*)p_this;
112 const uint8_t *p_peek;
114 if( stream_Peek( p_demux->s, &p_peek, 4 ) < 4 )
116 msg_Err( p_demux, "cannot peek" );
120 if( memcmp( p_peek, "\x00\x00\x01", 3 ) || ( p_peek[3] < 0xb9 ) )
125 msg_Warn( p_demux, "this does not look like an MPEG PS stream, "
126 "continuing anyway" );
129 /* Fill p_demux field */
130 p_demux->pf_demux = Demux;
131 p_demux->pf_control = Control;
132 p_demux->p_sys = p_sys = malloc( sizeof( demux_sys_t ) );
133 if( !p_sys ) return VLC_ENOMEM;
136 p_sys->i_mux_rate = 0;
138 p_sys->i_last_scr = -1;
139 p_sys->i_length = -1;
140 p_sys->i_current_pts = (mtime_t) 0;
141 p_sys->i_time_track = -1;
142 p_sys->i_aob_mlp_count = 0;
144 p_sys->b_lost_sync = false;
145 p_sys->b_have_pack = false;
146 p_sys->b_seekable = false;
148 stream_Control( p_demux->s, STREAM_CAN_SEEK, &p_sys->b_seekable );
150 ps_psm_init( &p_sys->psm );
151 ps_track_init( p_sys->tk );
153 /* TODO prescanning of ES */
158 static int OpenForce( vlc_object_t *p_this )
160 return OpenCommon( p_this, true );
163 static int Open( vlc_object_t *p_this )
165 return OpenCommon( p_this, ((demux_t *)p_this)->b_force );
168 /*****************************************************************************
170 *****************************************************************************/
171 static void Close( vlc_object_t *p_this )
173 demux_t *p_demux = (demux_t*)p_this;
174 demux_sys_t *p_sys = p_demux->p_sys;
177 for( i = 0; i < PS_TK_COUNT; i++ )
179 ps_track_t *tk = &p_sys->tk[i];
182 es_format_Clean( &tk->fmt );
183 if( tk->es ) es_out_Del( p_demux->out, tk->es );
187 ps_psm_destroy( &p_sys->psm );
192 static int Demux2( demux_t *p_demux, bool b_end )
194 demux_sys_t *p_sys = p_demux->p_sys;
199 i_ret = ps_pkt_resynch( p_demux->s, &i_code );
204 else if( i_ret == 0 )
206 if( !p_sys->b_lost_sync )
207 msg_Warn( p_demux, "garbage at input, trying to resync..." );
209 p_sys->b_lost_sync = true;
213 if( p_sys->b_lost_sync ) msg_Warn( p_demux, "found sync code" );
214 p_sys->b_lost_sync = false;
216 if( ( p_pkt = ps_pkt_read( p_demux->s, i_code ) ) == NULL )
220 if( (i_id = ps_pkt_id( p_pkt )) >= 0xc0 )
222 ps_track_t *tk = &p_sys->tk[PS_ID_TO_TK(i_id)];
223 if( !ps_pkt_parse_pes( p_pkt, tk->i_skip ) && p_pkt->i_pts > VLC_TS_INVALID )
225 if( b_end && p_pkt->i_pts > tk->i_last_pts )
227 tk->i_last_pts = p_pkt->i_pts;
229 else if ( tk->i_first_pts == -1 )
231 tk->i_first_pts = p_pkt->i_pts;
235 block_Release( p_pkt );
239 static void FindLength( demux_t *p_demux )
241 demux_sys_t *p_sys = p_demux->p_sys;
242 int64_t i_current_pos = -1, i_size = 0, i_end = 0;
244 if( !var_CreateGetBool( p_demux, "ps-trust-timestamps" ) )
247 if( p_sys->i_length == -1 ) /* First time */
250 /* Check beginning */
252 i_current_pos = stream_Tell( p_demux->s );
253 while( vlc_object_alive (p_demux) && i < 40 && Demux2( p_demux, false ) > 0 ) i++;
256 i_size = stream_Size( p_demux->s );
257 i_end = VLC_CLIP( i_size, 0, 200000 );
258 stream_Seek( p_demux->s, i_size - i_end );
261 while( vlc_object_alive (p_demux) && i < 40 && Demux2( p_demux, true ) > 0 ) i++;
262 if( i_current_pos >= 0 ) stream_Seek( p_demux->s, i_current_pos );
265 /* Find the longest track */
266 for( int i = 0; i < PS_TK_COUNT; i++ )
268 ps_track_t *tk = &p_sys->tk[i];
269 if( tk->i_first_pts >= 0 && tk->i_last_pts > 0 &&
270 tk->i_last_pts > tk->i_first_pts )
272 int64_t i_length = (int64_t)tk->i_last_pts - tk->i_first_pts;
273 if( i_length > p_sys->i_length )
275 p_sys->i_length = i_length;
276 p_sys->i_time_track = i;
277 msg_Dbg( p_demux, "we found a length of: %"PRId64, p_sys->i_length );
283 /*****************************************************************************
285 *****************************************************************************/
286 static int Demux( demux_t *p_demux )
288 demux_sys_t *p_sys = p_demux->p_sys;
289 int i_ret, i_id, i_mux_rate;
293 i_ret = ps_pkt_resynch( p_demux->s, &i_code );
298 else if( i_ret == 0 )
300 if( !p_sys->b_lost_sync )
301 msg_Warn( p_demux, "garbage at input, trying to resync..." );
303 p_sys->b_lost_sync = true;
307 if( p_sys->b_lost_sync ) msg_Warn( p_demux, "found sync code" );
308 p_sys->b_lost_sync = false;
310 if( p_sys->i_length < 0 && p_sys->b_seekable )
311 FindLength( p_demux );
313 if( ( p_pkt = ps_pkt_read( p_demux->s, i_code ) ) == NULL )
321 block_Release( p_pkt );
325 if( !ps_pkt_parse_pack( p_pkt, &p_sys->i_scr, &i_mux_rate ) )
327 p_sys->i_last_scr = p_sys->i_scr;
328 if( !p_sys->b_have_pack ) p_sys->b_have_pack = true;
329 /* done later on to work around bad vcd/svcd streams */
330 /* es_out_Control( p_demux->out, ES_OUT_SET_PCR, p_sys->i_scr ); */
331 if( i_mux_rate > 0 ) p_sys->i_mux_rate = i_mux_rate;
333 block_Release( p_pkt );
337 if( !ps_pkt_parse_system( p_pkt, &p_sys->psm, p_sys->tk ) )
340 for( i = 0; i < PS_TK_COUNT; i++ )
342 ps_track_t *tk = &p_sys->tk[i];
344 if( tk->b_seen && !tk->es && tk->fmt.i_cat != UNKNOWN_ES )
346 tk->es = es_out_Add( p_demux->out, &tk->fmt );
350 block_Release( p_pkt );
354 if( p_sys->psm.i_version == 0xFFFF )
355 msg_Dbg( p_demux, "contains a PSM");
357 ps_psm_fill( &p_sys->psm, p_pkt, p_sys->tk, p_demux->out );
358 block_Release( p_pkt );
362 if( (i_id = ps_pkt_id( p_pkt )) >= 0xc0 )
364 /* Small heuristic to improve MLP detection from AOB */
365 if( i_id == 0xa001 &&
366 p_sys->i_aob_mlp_count < 500 )
368 p_sys->i_aob_mlp_count++;
370 else if( i_id == 0xbda1 &&
371 p_sys->i_aob_mlp_count > 0 )
373 p_sys->i_aob_mlp_count--;
378 ps_track_t *tk = &p_sys->tk[PS_ID_TO_TK(i_id)];
382 if( !ps_track_fill( tk, &p_sys->psm, i_id ) )
384 tk->es = es_out_Add( p_demux->out, &tk->fmt );
389 msg_Dbg( p_demux, "es id=0x%x format unknown", i_id );
394 /* The popular VCD/SVCD subtitling WinSubMux does not
395 * renumber the SCRs when merging subtitles into the PES */
397 ( tk->fmt.i_codec == VLC_CODEC_OGT ||
398 tk->fmt.i_codec == VLC_CODEC_CVD ) )
401 p_sys->i_last_scr = -1;
404 if( p_sys->i_scr >= 0 )
405 es_out_Control( p_demux->out, ES_OUT_SET_PCR, VLC_TS_0 + p_sys->i_scr );
409 if( tk->b_seen && tk->es &&
410 !ps_pkt_parse_pes( p_pkt, tk->i_skip ) )
412 if( !b_new && !p_sys->b_have_pack &&
413 (tk->fmt.i_cat == AUDIO_ES) &&
414 (p_pkt->i_pts > VLC_TS_INVALID) )
416 /* A hack to sync the A/V on PES files. */
417 msg_Dbg( p_demux, "force SCR: %"PRId64, p_pkt->i_pts );
418 es_out_Control( p_demux->out, ES_OUT_SET_PCR, p_pkt->i_pts );
420 if( tk->fmt.i_codec == VLC_CODEC_TELETEXT &&
421 p_pkt->i_pts <= VLC_TS_INVALID && p_sys->i_last_scr >= 0 )
423 /* Teletext may have missing PTS (ETSI EN 300 472 Annexe A)
424 * In this case use the last SCR + 40ms */
425 p_pkt->i_pts = VLC_TS_0 + p_sys->i_last_scr + 40000;
428 if( (int64_t)p_pkt->i_pts > p_sys->i_current_pts )
430 p_sys->i_current_pts = (int64_t)p_pkt->i_pts;
433 es_out_Send( p_demux->out, tk->es, p_pkt );
437 block_Release( p_pkt );
442 block_Release( p_pkt );
447 demux_UpdateTitleFromStream( p_demux );
451 /*****************************************************************************
453 *****************************************************************************/
454 static int Control( demux_t *p_demux, int i_query, va_list args )
456 demux_sys_t *p_sys = p_demux->p_sys;
462 case DEMUX_GET_POSITION:
463 pf = (double*) va_arg( args, double* );
464 i64 = stream_Size( p_demux->s );
467 double current = stream_Tell( p_demux->s );
468 *pf = current / (double)i64;
476 case DEMUX_SET_POSITION:
477 f = (double) va_arg( args, double );
478 i64 = stream_Size( p_demux->s );
479 p_sys->i_current_pts = 0;
480 p_sys->i_last_scr = -1;
482 return stream_Seek( p_demux->s, (int64_t)(i64 * f) );
485 pi64 = (int64_t*)va_arg( args, int64_t * );
486 if( p_sys->i_time_track >= 0 && p_sys->i_current_pts > 0 )
488 *pi64 = p_sys->i_current_pts - p_sys->tk[p_sys->i_time_track].i_first_pts;
491 if( p_sys->i_mux_rate > 0 )
493 *pi64 = (int64_t)1000000 * ( stream_Tell( p_demux->s ) / 50 ) /
500 case DEMUX_GET_LENGTH:
501 pi64 = (int64_t*)va_arg( args, int64_t * );
502 if( p_sys->i_length > 0 )
504 *pi64 = p_sys->i_length;
507 else if( p_sys->i_mux_rate > 0 )
509 *pi64 = (int64_t)1000000 * ( stream_Size( p_demux->s ) / 50 ) /
517 i64 = (int64_t)va_arg( args, int64_t );
518 if( p_sys->i_time_track >= 0 && p_sys->i_current_pts > 0 )
520 int64_t i_now = p_sys->i_current_pts - p_sys->tk[p_sys->i_time_track].i_first_pts;
521 int64_t i_pos = stream_Tell( p_demux->s );
524 return i64 ? VLC_EGENERIC : VLC_SUCCESS;
526 p_sys->i_current_pts = 0;
527 p_sys->i_last_scr = -1;
528 i_pos *= (float)i64 / (float)i_now;
529 stream_Seek( p_demux->s, i_pos );
534 case DEMUX_GET_TITLE_INFO:
536 struct input_title_t ***v = va_arg( args, struct input_title_t*** );
537 int *c = va_arg( args, int * );
539 *va_arg( args, int* ) = 0; /* Title offset */
540 *va_arg( args, int* ) = 0; /* Chapter offset */
541 return stream_Control( p_demux->s, STREAM_GET_TITLE_INFO, v, c );
544 case DEMUX_SET_TITLE:
545 return stream_vaControl( p_demux->s, STREAM_SET_TITLE, args );
547 case DEMUX_SET_SEEKPOINT:
548 return stream_vaControl( p_demux->s, STREAM_SET_SEEKPOINT, args );
551 return stream_vaControl( p_demux->s, STREAM_GET_META, args );
559 /*****************************************************************************
561 *****************************************************************************/
563 /* PSResynch: resynch on a system startcode
564 * It doesn't skip more than 512 bytes
565 * -1 -> error, 0 -> not synch, 1 -> ok
567 static int ps_pkt_resynch( stream_t *s, uint32_t *pi_code )
569 const uint8_t *p_peek;
573 if( stream_Peek( s, &p_peek, 4 ) < 4 )
577 if( p_peek[0] == 0 && p_peek[1] == 0 && p_peek[2] == 1 &&
580 *pi_code = 0x100 | p_peek[3];
584 if( ( i_peek = stream_Peek( s, &p_peek, 512 ) ) < 4 )
596 if( p_peek[0] == 0 && p_peek[1] == 0 && p_peek[2] == 1 &&
599 *pi_code = 0x100 | p_peek[3];
600 return stream_Read( s, NULL, i_skip ) == i_skip ? 1 : -1;
607 return stream_Read( s, NULL, i_skip ) == i_skip ? 0 : -1;
610 static block_t *ps_pkt_read( stream_t *s, uint32_t i_code )
612 const uint8_t *p_peek;
613 int i_peek = stream_Peek( s, &p_peek, 14 );
617 int i_size = ps_pkt_size( p_peek, i_peek );
618 if( i_size <= 6 && p_peek[3] > 0xba )
620 /* Special case, search the next start code */
624 i_peek = stream_Peek( s, &p_peek, i_size + 1024 );
625 if( i_peek <= i_size + 4 )
629 while( i_size <= i_peek - 4 )
631 if( p_peek[i_size] == 0x00 && p_peek[i_size+1] == 0x00 &&
632 p_peek[i_size+2] == 0x01 && p_peek[i_size+3] >= 0xb9 )
634 return stream_Block( s, i_size );
643 return stream_Block( s, i_size );