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 *****************************************************************************/
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_category( CAT_INPUT );
58 set_subcategory( SUBCAT_INPUT_DEMUX );
59 set_capability( "demux", 1 );
60 set_callbacks( OpenForce, Close );
63 add_bool( "ps-trust-timestamps", true, NULL, TIME_TEXT,
64 TIME_LONGTEXT, true );
67 set_description( N_("MPEG-PS demuxer") );
68 set_capability( "demux", 8 );
69 set_callbacks( Open, Close );
72 /*****************************************************************************
74 *****************************************************************************/
79 ps_track_t tk[PS_TK_COUNT];
85 int64_t i_current_pts;
92 static int Demux ( demux_t *p_demux );
93 static int Control( demux_t *p_demux, int i_query, va_list args );
95 static int ps_pkt_resynch( stream_t *, uint32_t *pi_code );
96 static block_t *ps_pkt_read ( stream_t *, uint32_t i_code );
98 /*****************************************************************************
100 *****************************************************************************/
101 static int OpenCommon( vlc_object_t *p_this, bool b_force )
103 demux_t *p_demux = (demux_t*)p_this;
106 const uint8_t *p_peek;
108 if( stream_Peek( p_demux->s, &p_peek, 4 ) < 4 )
110 msg_Err( p_demux, "cannot peek" );
114 if( memcmp( p_peek, "\x00\x00\x01", 3 ) || ( p_peek[3] < 0xb9 ) )
119 msg_Warn( p_demux, "this does not look like an MPEG PS stream, "
120 "continuing anyway" );
123 /* Fill p_demux field */
124 p_demux->pf_demux = Demux;
125 p_demux->pf_control = Control;
126 p_demux->p_sys = p_sys = malloc( sizeof( demux_sys_t ) );
129 p_sys->i_mux_rate = 0;
131 p_sys->i_length = -1;
132 p_sys->i_current_pts = (mtime_t) 0;
133 p_sys->i_time_track = -1;
135 p_sys->b_lost_sync = false;
136 p_sys->b_have_pack = false;
137 p_sys->b_seekable = false;
139 stream_Control( p_demux->s, STREAM_CAN_SEEK, &p_sys->b_seekable );
141 ps_psm_init( &p_sys->psm );
142 ps_track_init( p_sys->tk );
144 /* TODO prescanning of ES */
149 static int OpenForce( vlc_object_t *p_this )
151 return OpenCommon( p_this, true );
154 static int Open( vlc_object_t *p_this )
156 return OpenCommon( p_this, ((demux_t *)p_this)->b_force );
159 /*****************************************************************************
161 *****************************************************************************/
162 static void Close( vlc_object_t *p_this )
164 demux_t *p_demux = (demux_t*)p_this;
165 demux_sys_t *p_sys = p_demux->p_sys;
168 for( i = 0; i < PS_TK_COUNT; i++ )
170 ps_track_t *tk = &p_sys->tk[i];
173 es_format_Clean( &tk->fmt );
174 if( tk->es ) es_out_Del( p_demux->out, tk->es );
178 ps_psm_destroy( &p_sys->psm );
183 static int Demux2( demux_t *p_demux, bool b_end )
185 demux_sys_t *p_sys = p_demux->p_sys;
190 i_ret = ps_pkt_resynch( p_demux->s, &i_code );
195 else if( i_ret == 0 )
197 if( !p_sys->b_lost_sync )
198 msg_Warn( p_demux, "garbage at input, trying to resync..." );
200 p_sys->b_lost_sync = true;
204 if( p_sys->b_lost_sync ) msg_Warn( p_demux, "found sync code" );
205 p_sys->b_lost_sync = false;
207 if( ( p_pkt = ps_pkt_read( p_demux->s, i_code ) ) == NULL )
211 if( (i_id = ps_pkt_id( p_pkt )) >= 0xc0 )
213 ps_track_t *tk = &p_sys->tk[PS_ID_TO_TK(i_id)];
214 if( !ps_pkt_parse_pes( p_pkt, tk->i_skip ) )
216 if( b_end && p_pkt->i_pts > tk->i_last_pts )
218 tk->i_last_pts = p_pkt->i_pts;
220 else if ( tk->i_first_pts == -1 )
222 tk->i_first_pts = p_pkt->i_pts;
226 block_Release( p_pkt );
230 static void FindLength( demux_t *p_demux )
232 demux_sys_t *p_sys = p_demux->p_sys;
233 int64_t i_current_pos = -1, i_size = 0, i_end = 0;
236 if( !var_CreateGetInteger( p_demux, "ps-trust-timestamps" ) )
239 if( p_sys->i_length == -1 ) /* First time */
242 /* Check beginning */
244 i_current_pos = stream_Tell( p_demux->s );
245 while( !p_demux->b_die && i < 40 && Demux2( p_demux, false ) > 0 ) i++;
248 i_size = stream_Size( p_demux->s );
249 i_end = __MAX( 0, __MIN( 200000, i_size ) );
250 stream_Seek( p_demux->s, i_size - i_end );
252 while( !p_demux->b_die && Demux2( p_demux, true ) > 0 );
253 if( i_current_pos >= 0 ) stream_Seek( p_demux->s, i_current_pos );
256 for( i = 0; i < PS_TK_COUNT; i++ )
258 ps_track_t *tk = &p_sys->tk[i];
259 if( tk->i_first_pts >= 0 && tk->i_last_pts > 0 )
260 if( tk->i_last_pts > tk->i_first_pts )
262 int64_t i_length = (int64_t)tk->i_last_pts - tk->i_first_pts;
263 if( i_length > p_sys->i_length )
265 p_sys->i_length = i_length;
266 p_sys->i_time_track = i;
267 msg_Dbg( p_demux, "we found a length of: %"PRId64, p_sys->i_length );
273 /*****************************************************************************
275 *****************************************************************************/
276 static int Demux( demux_t *p_demux )
278 demux_sys_t *p_sys = p_demux->p_sys;
279 int i_ret, i_id, i_mux_rate;
283 i_ret = ps_pkt_resynch( p_demux->s, &i_code );
288 else if( i_ret == 0 )
290 if( !p_sys->b_lost_sync )
291 msg_Warn( p_demux, "garbage at input, trying to resync..." );
293 p_sys->b_lost_sync = true;
297 if( p_sys->b_lost_sync ) msg_Warn( p_demux, "found sync code" );
298 p_sys->b_lost_sync = false;
300 if( p_sys->i_length < 0 && p_sys->b_seekable )
301 FindLength( p_demux );
303 if( ( p_pkt = ps_pkt_read( p_demux->s, i_code ) ) == NULL )
311 block_Release( p_pkt );
315 if( !ps_pkt_parse_pack( p_pkt, &p_sys->i_scr, &i_mux_rate ) )
317 if( !p_sys->b_have_pack ) p_sys->b_have_pack = true;
318 /* done later on to work around bad vcd/svcd streams */
319 /* es_out_Control( p_demux->out, ES_OUT_SET_PCR, p_sys->i_scr ); */
320 if( i_mux_rate > 0 ) p_sys->i_mux_rate = i_mux_rate;
322 block_Release( p_pkt );
326 if( !ps_pkt_parse_system( p_pkt, &p_sys->psm, p_sys->tk ) )
329 for( i = 0; i < PS_TK_COUNT; i++ )
331 ps_track_t *tk = &p_sys->tk[i];
333 if( tk->b_seen && !tk->es && tk->fmt.i_cat != UNKNOWN_ES )
335 tk->es = es_out_Add( p_demux->out, &tk->fmt );
339 block_Release( p_pkt );
343 if( p_sys->psm.i_version == 0xFFFF )
344 msg_Dbg( p_demux, "contains a PSM");
346 ps_psm_fill( &p_sys->psm, p_pkt, p_sys->tk, p_demux->out );
347 block_Release( p_pkt );
351 if( (i_id = ps_pkt_id( p_pkt )) >= 0xc0 )
354 ps_track_t *tk = &p_sys->tk[PS_ID_TO_TK(i_id)];
358 if( !ps_track_fill( tk, &p_sys->psm, i_id ) )
360 tk->es = es_out_Add( p_demux->out, &tk->fmt );
365 msg_Dbg( p_demux, "es id=0x%x format unknown", i_id );
370 /* The popular VCD/SVCD subtitling WinSubMux does not
371 * renumber the SCRs when merging subtitles into the PES */
373 ( tk->fmt.i_codec == VLC_FOURCC('o','g','t',' ') ||
374 tk->fmt.i_codec == VLC_FOURCC('c','v','d',' ') ) )
379 if( p_sys->i_scr > 0 )
380 es_out_Control( p_demux->out, ES_OUT_SET_PCR, p_sys->i_scr );
384 if( tk->b_seen && tk->es &&
386 #ifdef ZVBI_COMPILED /* FIXME!! */
387 tk->fmt.i_codec == VLC_FOURCC('t','e','l','x') ||
389 !ps_pkt_parse_pes( p_pkt, tk->i_skip ) ) )
391 if( !b_new && !p_sys->b_have_pack &&
392 (tk->fmt.i_cat == AUDIO_ES) &&
395 /* A hack to sync the A/V on PES files. */
396 msg_Dbg( p_demux, "force SCR: %"PRId64, p_pkt->i_pts );
397 es_out_Control( p_demux->out, ES_OUT_SET_PCR, p_pkt->i_pts );
400 if( (int64_t)p_pkt->i_pts > p_sys->i_current_pts )
402 p_sys->i_current_pts = (int64_t)p_pkt->i_pts;
405 es_out_Send( p_demux->out, tk->es, p_pkt );
409 block_Release( p_pkt );
414 block_Release( p_pkt );
422 /*****************************************************************************
424 *****************************************************************************/
425 static int Control( demux_t *p_demux, int i_query, va_list args )
427 demux_sys_t *p_sys = p_demux->p_sys;
433 case DEMUX_GET_POSITION:
434 pf = (double*) va_arg( args, double* );
435 i64 = stream_Size( p_demux->s );
438 *pf = (double)stream_Tell( p_demux->s ) / (double)i64;
446 case DEMUX_SET_POSITION:
447 f = (double) va_arg( args, double );
448 i64 = stream_Size( p_demux->s );
449 p_sys->i_current_pts = 0;
450 es_out_Control( p_demux->out, ES_OUT_RESET_PCR );
452 return stream_Seek( p_demux->s, (int64_t)(i64 * f) );
455 pi64 = (int64_t*)va_arg( args, int64_t * );
456 if( p_sys->i_time_track >= 0 && p_sys->i_current_pts > 0 )
458 *pi64 = p_sys->i_current_pts - p_sys->tk[p_sys->i_time_track].i_first_pts;
461 if( p_sys->i_mux_rate > 0 )
463 *pi64 = (int64_t)1000000 * ( stream_Tell( p_demux->s ) / 50 ) /
470 case DEMUX_GET_LENGTH:
471 pi64 = (int64_t*)va_arg( args, int64_t * );
472 if( p_sys->i_length > 0 )
474 *pi64 = p_sys->i_length;
477 else if( p_sys->i_mux_rate > 0 )
479 *pi64 = (int64_t)1000000 * ( stream_Size( p_demux->s ) / 50 ) /
487 i64 = (int64_t)va_arg( args, int64_t );
488 if( p_sys->i_time_track >= 0 && p_sys->i_current_pts > 0 )
490 int64_t i_now = p_sys->i_current_pts - p_sys->tk[p_sys->i_time_track].i_first_pts;
491 int64_t i_pos = stream_Tell( p_demux->s );
492 int64_t i_offset = i_pos / (i_now / 1000000) * ((i64 - i_now) / 1000000);
493 stream_Seek( p_demux->s, i_pos + i_offset);
495 es_out_Control( p_demux->out, ES_OUT_RESET_PCR );
506 /*****************************************************************************
508 *****************************************************************************/
510 /* PSResynch: resynch on a system startcode
511 * It doesn't skip more than 512 bytes
512 * -1 -> error, 0 -> not synch, 1 -> ok
514 static int ps_pkt_resynch( stream_t *s, uint32_t *pi_code )
516 const uint8_t *p_peek;
520 if( stream_Peek( s, &p_peek, 4 ) < 4 )
524 if( p_peek[0] == 0 && p_peek[1] == 0 && p_peek[2] == 1 &&
527 *pi_code = 0x100 | p_peek[3];
531 if( ( i_peek = stream_Peek( s, &p_peek, 512 ) ) < 4 )
543 if( p_peek[0] == 0 && p_peek[1] == 0 && p_peek[2] == 1 &&
546 *pi_code = 0x100 | p_peek[3];
547 return stream_Read( s, NULL, i_skip ) == i_skip ? 1 : -1;
554 return stream_Read( s, NULL, i_skip ) == i_skip ? 0 : -1;
557 static block_t *ps_pkt_read( stream_t *s, uint32_t i_code )
559 const uint8_t *p_peek;
560 int i_peek = stream_Peek( s, &p_peek, 14 );
561 int i_size = ps_pkt_size( p_peek, i_peek );
563 if( i_size <= 6 && p_peek[3] > 0xba )
565 /* Special case, search the next start code */
569 i_peek = stream_Peek( s, &p_peek, i_size + 1024 );
570 if( i_peek <= i_size + 4 )
574 while( i_size <= i_peek - 4 )
576 if( p_peek[i_size] == 0x00 && p_peek[i_size+1] == 0x00 &&
577 p_peek[i_size+2] == 0x01 && p_peek[i_size+3] >= 0xb9 )
579 return stream_Block( s, i_size );
588 return stream_Block( s, i_size );