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 *****************************************************************************/
33 #include <vlc_demux.h>
38 * - re-add pre-scanning.
42 #define TIME_TEXT N_("Trust MPEG timestamps")
43 #define TIME_LONGTEXT N_("Normally we use the timestamps of the MPEG files " \
44 "to calculate position and duration. However sometimes this might not " \
45 "be usable. Disable this option to calculate from the bitrate instead." )
47 /*****************************************************************************
49 *****************************************************************************/
50 static int OpenForce( vlc_object_t * );
51 static int Open ( vlc_object_t * );
52 static void Close ( vlc_object_t * );
55 set_description( _("MPEG-PS demuxer") );
56 set_category( CAT_INPUT );
57 set_subcategory( SUBCAT_INPUT_DEMUX );
58 set_capability( "demux2", 1 );
59 set_callbacks( OpenForce, Close );
62 add_bool( "ps-trust-timestamps", VLC_TRUE, NULL, TIME_TEXT,
63 TIME_LONGTEXT, VLC_TRUE );
66 set_description( _("MPEG-PS demuxer") );
67 set_capability( "demux2", 8 );
68 set_callbacks( Open, Close );
71 /*****************************************************************************
73 *****************************************************************************/
78 ps_track_t tk[PS_TK_COUNT];
84 int64_t i_current_pts;
86 vlc_bool_t b_lost_sync;
87 vlc_bool_t b_have_pack;
88 vlc_bool_t b_seekable;
91 static int Demux ( demux_t *p_demux );
92 static int Control( demux_t *p_demux, int i_query, va_list args );
94 static int ps_pkt_resynch( stream_t *, uint32_t *pi_code );
95 static block_t *ps_pkt_read ( stream_t *, uint32_t i_code );
97 /*****************************************************************************
99 *****************************************************************************/
100 static int OpenCommon( vlc_object_t *p_this, vlc_bool_t b_force )
102 demux_t *p_demux = (demux_t*)p_this;
105 const uint8_t *p_peek;
107 if( stream_Peek( p_demux->s, &p_peek, 4 ) < 4 )
109 msg_Err( p_demux, "cannot peek" );
113 if( memcmp( p_peek, "\x00\x00\x01", 3 ) || ( p_peek[3] < 0xb9 ) )
118 msg_Warn( p_demux, "this does not look like an MPEG PS stream, "
119 "continuing anyway" );
122 /* Fill p_demux field */
123 p_demux->pf_demux = Demux;
124 p_demux->pf_control = Control;
125 p_demux->p_sys = p_sys = malloc( sizeof( demux_sys_t ) );
128 p_sys->i_mux_rate = 0;
130 p_sys->i_length = -1;
131 p_sys->i_current_pts = (mtime_t) 0;
132 p_sys->i_time_track = -1;
134 p_sys->b_lost_sync = VLC_FALSE;
135 p_sys->b_have_pack = VLC_FALSE;
136 p_sys->b_seekable = VLC_FALSE;
138 stream_Control( p_demux->s, STREAM_CAN_SEEK, &p_sys->b_seekable );
140 ps_psm_init( &p_sys->psm );
141 ps_track_init( p_sys->tk );
143 /* TODO prescanning of ES */
148 static int OpenForce( vlc_object_t *p_this )
150 return OpenCommon( p_this, VLC_TRUE );
153 static int Open( vlc_object_t *p_this )
155 return OpenCommon( p_this, ((demux_t *)p_this)->b_force );
158 /*****************************************************************************
160 *****************************************************************************/
161 static void Close( vlc_object_t *p_this )
163 demux_t *p_demux = (demux_t*)p_this;
164 demux_sys_t *p_sys = p_demux->p_sys;
167 for( i = 0; i < PS_TK_COUNT; i++ )
169 ps_track_t *tk = &p_sys->tk[i];
172 es_format_Clean( &tk->fmt );
173 if( tk->es ) es_out_Del( p_demux->out, tk->es );
177 ps_psm_destroy( &p_sys->psm );
182 static int Demux2( demux_t *p_demux, vlc_bool_t b_end )
184 demux_sys_t *p_sys = p_demux->p_sys;
189 i_ret = ps_pkt_resynch( p_demux->s, &i_code );
194 else if( i_ret == 0 )
196 if( !p_sys->b_lost_sync )
197 msg_Warn( p_demux, "garbage at input, trying to resync..." );
199 p_sys->b_lost_sync = VLC_TRUE;
203 if( p_sys->b_lost_sync ) msg_Warn( p_demux, "found sync code" );
204 p_sys->b_lost_sync = VLC_FALSE;
206 if( ( p_pkt = ps_pkt_read( p_demux->s, i_code ) ) == NULL )
210 if( (i_id = ps_pkt_id( p_pkt )) >= 0xc0 )
212 ps_track_t *tk = &p_sys->tk[PS_ID_TO_TK(i_id)];
213 if( !ps_pkt_parse_pes( p_pkt, tk->i_skip ) )
215 if( b_end && p_pkt->i_pts > tk->i_last_pts )
217 tk->i_last_pts = p_pkt->i_pts;
219 else if ( tk->i_first_pts == -1 )
221 tk->i_first_pts = p_pkt->i_pts;
225 block_Release( p_pkt );
229 static void FindLength( demux_t *p_demux )
231 demux_sys_t *p_sys = p_demux->p_sys;
232 int64_t i_current_pos = -1, i_size = 0, i_end = 0;
235 if( !var_CreateGetInteger( p_demux, "ps-trust-timestamps" ) )
238 if( p_sys->i_length == -1 ) /* First time */
241 /* Check beginning */
243 i_current_pos = stream_Tell( p_demux->s );
244 while( !p_demux->b_die && i < 40 && Demux2( p_demux, VLC_FALSE ) > 0 ) i++;
247 i_size = stream_Size( p_demux->s );
248 i_end = __MAX( 0, __MIN( 200000, i_size ) );
249 stream_Seek( p_demux->s, i_size - i_end );
251 while( !p_demux->b_die && Demux2( p_demux, VLC_TRUE ) > 0 );
252 if( i_current_pos >= 0 ) stream_Seek( p_demux->s, i_current_pos );
255 for( i = 0; i < PS_TK_COUNT; i++ )
257 ps_track_t *tk = &p_sys->tk[i];
258 if( tk->i_first_pts >= 0 && tk->i_last_pts > 0 )
259 if( tk->i_last_pts > tk->i_first_pts )
261 int64_t i_length = (int64_t)tk->i_last_pts - tk->i_first_pts;
262 if( i_length > p_sys->i_length )
264 p_sys->i_length = i_length;
265 p_sys->i_time_track = i;
266 msg_Dbg( p_demux, "we found a length of: "I64Fd, p_sys->i_length );
272 /*****************************************************************************
274 *****************************************************************************/
275 static int Demux( demux_t *p_demux )
277 demux_sys_t *p_sys = p_demux->p_sys;
278 int i_ret, i_id, i_mux_rate;
282 i_ret = ps_pkt_resynch( p_demux->s, &i_code );
287 else if( i_ret == 0 )
289 if( !p_sys->b_lost_sync )
290 msg_Warn( p_demux, "garbage at input, trying to resync..." );
292 p_sys->b_lost_sync = VLC_TRUE;
296 if( p_sys->b_lost_sync ) msg_Warn( p_demux, "found sync code" );
297 p_sys->b_lost_sync = VLC_FALSE;
299 if( p_sys->i_length < 0 && p_sys->b_seekable )
300 FindLength( p_demux );
302 if( ( p_pkt = ps_pkt_read( p_demux->s, i_code ) ) == NULL )
310 block_Release( p_pkt );
314 if( !ps_pkt_parse_pack( p_pkt, &p_sys->i_scr, &i_mux_rate ) )
316 if( !p_sys->b_have_pack ) p_sys->b_have_pack = VLC_TRUE;
317 /* done later on to work around bad vcd/svcd streams */
318 /* es_out_Control( p_demux->out, ES_OUT_SET_PCR, p_sys->i_scr ); */
319 if( i_mux_rate > 0 ) p_sys->i_mux_rate = i_mux_rate;
321 block_Release( p_pkt );
325 if( !ps_pkt_parse_system( p_pkt, &p_sys->psm, p_sys->tk ) )
328 for( i = 0; i < PS_TK_COUNT; i++ )
330 ps_track_t *tk = &p_sys->tk[i];
332 if( tk->b_seen && !tk->es && tk->fmt.i_cat != UNKNOWN_ES )
334 tk->es = es_out_Add( p_demux->out, &tk->fmt );
338 block_Release( p_pkt );
342 if( p_sys->psm.i_version == 0xFFFF )
343 msg_Dbg( p_demux, "contains a PSM");
345 ps_psm_fill( &p_sys->psm, p_pkt, p_sys->tk, p_demux->out );
346 block_Release( p_pkt );
350 if( (i_id = ps_pkt_id( p_pkt )) >= 0xc0 )
352 vlc_bool_t b_new = VLC_FALSE;
353 ps_track_t *tk = &p_sys->tk[PS_ID_TO_TK(i_id)];
357 if( !ps_track_fill( tk, &p_sys->psm, i_id ) )
359 tk->es = es_out_Add( p_demux->out, &tk->fmt );
364 msg_Dbg( p_demux, "es id=0x%x format unknown", i_id );
366 tk->b_seen = VLC_TRUE;
369 /* The popular VCD/SVCD subtitling WinSubMux does not
370 * renumber the SCRs when merging subtitles into the PES */
372 ( tk->fmt.i_codec == VLC_FOURCC('o','g','t',' ') ||
373 tk->fmt.i_codec == VLC_FOURCC('c','v','d',' ') ) )
378 if( p_sys->i_scr > 0 )
379 es_out_Control( p_demux->out, ES_OUT_SET_PCR, p_sys->i_scr );
383 if( tk->b_seen && tk->es &&
384 !ps_pkt_parse_pes( p_pkt, tk->i_skip ) )
386 if( !b_new && !p_sys->b_have_pack && tk->fmt.i_cat == AUDIO_ES && p_pkt->i_pts > 0 )
388 /* A hack to sync the A/V on PES files. */
389 msg_Dbg( p_demux, "force SCR: "I64Fd, p_pkt->i_pts );
390 es_out_Control( p_demux->out, ES_OUT_SET_PCR, p_pkt->i_pts );
393 if( (int64_t)p_pkt->i_pts > p_sys->i_current_pts )
395 p_sys->i_current_pts = (int64_t)p_pkt->i_pts;
398 es_out_Send( p_demux->out, tk->es, p_pkt );
402 block_Release( p_pkt );
407 block_Release( p_pkt );
415 /*****************************************************************************
417 *****************************************************************************/
418 static int Control( demux_t *p_demux, int i_query, va_list args )
420 demux_sys_t *p_sys = p_demux->p_sys;
426 case DEMUX_GET_POSITION:
427 pf = (double*) va_arg( args, double* );
428 i64 = stream_Size( p_demux->s );
431 *pf = (double)stream_Tell( p_demux->s ) / (double)i64;
439 case DEMUX_SET_POSITION:
440 f = (double) va_arg( args, double );
441 i64 = stream_Size( p_demux->s );
442 p_sys->i_current_pts = 0;
443 es_out_Control( p_demux->out, ES_OUT_RESET_PCR );
445 return stream_Seek( p_demux->s, (int64_t)(i64 * f) );
448 pi64 = (int64_t*)va_arg( args, int64_t * );
449 if( p_sys->i_time_track >= 0 && p_sys->i_current_pts > 0 )
451 *pi64 = p_sys->i_current_pts - p_sys->tk[p_sys->i_time_track].i_first_pts;
454 if( p_sys->i_mux_rate > 0 )
456 *pi64 = (int64_t)1000000 * ( stream_Tell( p_demux->s ) / 50 ) /
463 case DEMUX_GET_LENGTH:
464 pi64 = (int64_t*)va_arg( args, int64_t * );
465 if( p_sys->i_length > 0 )
467 *pi64 = p_sys->i_length;
470 else if( p_sys->i_mux_rate > 0 )
472 *pi64 = (int64_t)1000000 * ( stream_Size( p_demux->s ) / 50 ) /
480 i64 = (int64_t)va_arg( args, int64_t );
481 if( p_sys->i_time_track >= 0 && p_sys->i_current_pts > 0 )
483 int64_t i_now = p_sys->i_current_pts - p_sys->tk[p_sys->i_time_track].i_first_pts;
484 int64_t i_pos = stream_Tell( p_demux->s );
485 int64_t i_offset = i_pos / (i_now / 1000000) * ((i64 - i_now) / 1000000);
486 stream_Seek( p_demux->s, i_pos + i_offset);
488 es_out_Control( p_demux->out, ES_OUT_RESET_PCR );
499 /*****************************************************************************
501 *****************************************************************************/
503 /* PSResynch: resynch on a system startcode
504 * It doesn't skip more than 512 bytes
505 * -1 -> error, 0 -> not synch, 1 -> ok
507 static int ps_pkt_resynch( stream_t *s, uint32_t *pi_code )
509 const uint8_t *p_peek;
513 if( stream_Peek( s, &p_peek, 4 ) < 4 )
517 if( p_peek[0] == 0 && p_peek[1] == 0 && p_peek[2] == 1 &&
520 *pi_code = 0x100 | p_peek[3];
524 if( ( i_peek = stream_Peek( s, &p_peek, 512 ) ) < 4 )
536 if( p_peek[0] == 0 && p_peek[1] == 0 && p_peek[2] == 1 &&
539 *pi_code = 0x100 | p_peek[3];
540 return stream_Read( s, NULL, i_skip ) == i_skip ? 1 : -1;
547 return stream_Read( s, NULL, i_skip ) == i_skip ? 0 : -1;
550 static block_t *ps_pkt_read( stream_t *s, uint32_t i_code )
552 const uint8_t *p_peek;
553 int i_peek = stream_Peek( s, &p_peek, 14 );
554 int i_size = ps_pkt_size( p_peek, i_peek );
556 if( i_size <= 6 && p_peek[3] > 0xba )
558 /* Special case, search the next start code */
562 i_peek = stream_Peek( s, &p_peek, i_size + 1024 );
563 if( i_peek <= i_size + 4 )
567 while( i_size <= i_peek - 4 )
569 if( p_peek[i_size] == 0x00 && p_peek[i_size+1] == 0x00 &&
570 p_peek[i_size+2] == 0x01 && p_peek[i_size+3] >= 0xb9 )
572 return stream_Block( s, i_size );
581 return stream_Block( s, i_size );