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 *****************************************************************************/
27 #include <stdlib.h> /* malloc(), free() */
30 #include <vlc_demux.h>
35 * - re-add pre-scanning.
39 #define TIME_TEXT N_("Trust MPEG timestamps")
40 #define TIME_LONGTEXT N_("Normally we use the timestamps of the MPEG files " \
41 "to calculate position and duration. However sometimes this might not " \
42 "be usable. Disable this option to calculate from the bitrate instead." )
44 /*****************************************************************************
46 *****************************************************************************/
47 static int Open ( vlc_object_t * );
48 static int OpenAlt( vlc_object_t * );
49 static void Close ( vlc_object_t * );
52 set_description( _("MPEG-PS demuxer") );
53 set_category( CAT_INPUT );
54 set_subcategory( SUBCAT_INPUT_DEMUX );
55 set_capability( "demux2", 1 );
56 set_callbacks( Open, Close );
59 add_bool( "ps-trust-timestamps", VLC_TRUE, NULL, TIME_TEXT,
60 TIME_LONGTEXT, VLC_TRUE );
63 set_description( _("MPEG-PS demuxer") );
64 set_capability( "demux2", 9 );
65 set_callbacks( OpenAlt, Close );
68 /*****************************************************************************
70 *****************************************************************************/
75 ps_track_t tk[PS_TK_COUNT];
81 int64_t i_current_pts;
83 vlc_bool_t b_lost_sync;
84 vlc_bool_t b_have_pack;
85 vlc_bool_t b_seekable;
88 static int Demux ( demux_t *p_demux );
89 static int Control( demux_t *p_demux, int i_query, va_list args );
91 static int ps_pkt_resynch( stream_t *, uint32_t *pi_code );
92 static block_t *ps_pkt_read ( stream_t *, uint32_t i_code );
94 /*****************************************************************************
96 *****************************************************************************/
97 static int Open( vlc_object_t *p_this )
99 demux_t *p_demux = (demux_t*)p_this;
104 if( stream_Peek( p_demux->s, &p_peek, 4 ) < 4 )
106 msg_Err( p_demux, "cannot peek" );
110 if( p_peek[0] != 0 || p_peek[1] != 0 ||
111 p_peek[2] != 1 || p_peek[3] < 0xb9 )
113 msg_Warn( p_demux, "this does not look like an MPEG PS stream, "
114 "continuing anyway" );
117 /* Fill p_demux field */
118 p_demux->pf_demux = Demux;
119 p_demux->pf_control = Control;
120 p_demux->p_sys = p_sys = malloc( sizeof( demux_sys_t ) );
123 p_sys->i_mux_rate = 0;
125 p_sys->i_length = -1;
126 p_sys->i_current_pts = (mtime_t) 0;
127 p_sys->i_time_track = -1;
129 p_sys->b_lost_sync = VLC_FALSE;
130 p_sys->b_have_pack = VLC_FALSE;
131 p_sys->b_seekable = VLC_FALSE;
133 stream_Control( p_demux->s, STREAM_CAN_SEEK, &p_sys->b_seekable );
135 ps_psm_init( &p_sys->psm );
136 ps_track_init( p_sys->tk );
138 /* TODO prescanning of ES */
143 static int OpenAlt( vlc_object_t *p_this )
145 demux_t *p_demux = (demux_t*)p_this;
148 if( stream_Peek( p_demux->s, &p_peek, 4 ) < 4 )
150 msg_Err( p_demux, "cannot peek" );
154 if( p_peek[0] != 0 || p_peek[1] != 0 ||
155 p_peek[2] != 1 || p_peek[3] < 0xb9 )
157 if( !p_demux->b_force ) return VLC_EGENERIC;
160 return Open( p_this );
163 /*****************************************************************************
165 *****************************************************************************/
166 static void Close( vlc_object_t *p_this )
168 demux_t *p_demux = (demux_t*)p_this;
169 demux_sys_t *p_sys = p_demux->p_sys;
172 for( i = 0; i < PS_TK_COUNT; i++ )
174 ps_track_t *tk = &p_sys->tk[i];
177 es_format_Clean( &tk->fmt );
178 if( tk->es ) es_out_Del( p_demux->out, tk->es );
182 ps_psm_destroy( &p_sys->psm );
187 static int Demux2( demux_t *p_demux, vlc_bool_t b_end )
189 demux_sys_t *p_sys = p_demux->p_sys;
194 i_ret = ps_pkt_resynch( p_demux->s, &i_code );
199 else if( i_ret == 0 )
201 if( !p_sys->b_lost_sync )
202 msg_Warn( p_demux, "garbage at input, trying to resync..." );
204 p_sys->b_lost_sync = VLC_TRUE;
208 if( p_sys->b_lost_sync ) msg_Warn( p_demux, "found sync code" );
209 p_sys->b_lost_sync = VLC_FALSE;
211 if( ( p_pkt = ps_pkt_read( p_demux->s, i_code ) ) == NULL )
215 if( (i_id = ps_pkt_id( p_pkt )) >= 0xc0 )
217 ps_track_t *tk = &p_sys->tk[PS_ID_TO_TK(i_id)];
218 if( !ps_pkt_parse_pes( p_pkt, tk->i_skip ) )
220 if( b_end && p_pkt->i_pts > tk->i_last_pts )
222 tk->i_last_pts = p_pkt->i_pts;
224 else if ( tk->i_first_pts == -1 )
226 tk->i_first_pts = p_pkt->i_pts;
230 block_Release( p_pkt );
234 static void FindLength( demux_t *p_demux )
236 demux_sys_t *p_sys = p_demux->p_sys;
237 int64_t i_current_pos = -1, i_size = 0, i_end = 0;
240 if( !var_CreateGetInteger( p_demux, "ps-trust-timestamps" ) )
243 if( p_sys->i_length == -1 ) /* First time */
246 /* Check beginning */
248 i_current_pos = stream_Tell( p_demux->s );
249 while( !p_demux->b_die && i < 40 && Demux2( p_demux, VLC_FALSE ) > 0 ) i++;
252 i_size = stream_Size( p_demux->s );
253 i_end = __MAX( 0, __MIN( 200000, i_size ) );
254 stream_Seek( p_demux->s, i_size - i_end );
256 while( !p_demux->b_die && Demux2( p_demux, VLC_TRUE ) > 0 );
257 if( i_current_pos >= 0 ) stream_Seek( p_demux->s, i_current_pos );
260 for( i = 0; i < PS_TK_COUNT; i++ )
262 ps_track_t *tk = &p_sys->tk[i];
263 if( tk->i_first_pts >= 0 && tk->i_last_pts > 0 )
264 if( tk->i_last_pts > tk->i_first_pts )
266 int64_t i_length = (int64_t)tk->i_last_pts - tk->i_first_pts;
267 if( i_length > p_sys->i_length )
269 p_sys->i_length = i_length;
270 p_sys->i_time_track = i;
271 msg_Dbg( p_demux, "we found a length of: %lld", p_sys->i_length );
277 /*****************************************************************************
279 *****************************************************************************/
280 static int Demux( demux_t *p_demux )
282 demux_sys_t *p_sys = p_demux->p_sys;
283 int i_ret, i_id, i_mux_rate;
287 i_ret = ps_pkt_resynch( p_demux->s, &i_code );
292 else if( i_ret == 0 )
294 if( !p_sys->b_lost_sync )
295 msg_Warn( p_demux, "garbage at input, trying to resync..." );
297 p_sys->b_lost_sync = VLC_TRUE;
301 if( p_sys->b_lost_sync ) msg_Warn( p_demux, "found sync code" );
302 p_sys->b_lost_sync = VLC_FALSE;
304 if( p_sys->i_length < 0 && p_sys->b_seekable )
305 FindLength( p_demux );
307 if( ( p_pkt = ps_pkt_read( p_demux->s, i_code ) ) == NULL )
315 block_Release( p_pkt );
319 if( !ps_pkt_parse_pack( p_pkt, &p_sys->i_scr, &i_mux_rate ) )
321 if( !p_sys->b_have_pack ) p_sys->b_have_pack = VLC_TRUE;
322 /* done later on to work around bad vcd/svcd streams */
323 /* es_out_Control( p_demux->out, ES_OUT_SET_PCR, p_sys->i_scr ); */
324 if( i_mux_rate > 0 ) p_sys->i_mux_rate = i_mux_rate;
326 block_Release( p_pkt );
330 if( !ps_pkt_parse_system( p_pkt, &p_sys->psm, p_sys->tk ) )
333 for( i = 0; i < PS_TK_COUNT; i++ )
335 ps_track_t *tk = &p_sys->tk[i];
337 if( tk->b_seen && !tk->es && tk->fmt.i_cat != UNKNOWN_ES )
339 tk->es = es_out_Add( p_demux->out, &tk->fmt );
343 block_Release( p_pkt );
347 if( p_sys->psm.i_version == 0xFFFF )
348 msg_Dbg( p_demux, "contains a PSM");
350 ps_psm_fill( &p_sys->psm, p_pkt, p_sys->tk, p_demux->out );
351 block_Release( p_pkt );
355 if( (i_id = ps_pkt_id( p_pkt )) >= 0xc0 )
357 vlc_bool_t b_new = VLC_FALSE;
358 ps_track_t *tk = &p_sys->tk[PS_ID_TO_TK(i_id)];
362 if( !ps_track_fill( tk, &p_sys->psm, i_id ) )
364 tk->es = es_out_Add( p_demux->out, &tk->fmt );
369 msg_Dbg( p_demux, "es id=0x%x format unknown", i_id );
371 tk->b_seen = VLC_TRUE;
374 /* The popular VCD/SVCD subtitling WinSubMux does not
375 * renumber the SCRs when merging subtitles into the PES */
377 ( tk->fmt.i_codec == VLC_FOURCC('o','g','t',' ') ||
378 tk->fmt.i_codec == VLC_FOURCC('c','v','d',' ') ) )
383 if( p_sys->i_scr > 0 )
384 es_out_Control( p_demux->out, ES_OUT_SET_PCR, p_sys->i_scr );
388 if( tk->b_seen && tk->es &&
389 !ps_pkt_parse_pes( p_pkt, tk->i_skip ) )
391 if( !b_new && !p_sys->b_have_pack && tk->fmt.i_cat == AUDIO_ES && p_pkt->i_pts > 0 )
393 /* A hack to sync the A/V on PES files. */
394 msg_Dbg( p_demux, "force SCR: %lld", p_pkt->i_pts );
395 es_out_Control( p_demux->out, ES_OUT_SET_PCR, p_pkt->i_pts );
398 if( (int64_t)p_pkt->i_pts > p_sys->i_current_pts )
400 p_sys->i_current_pts = (int64_t)p_pkt->i_pts;
403 es_out_Send( p_demux->out, tk->es, p_pkt );
407 block_Release( p_pkt );
412 block_Release( p_pkt );
420 /*****************************************************************************
422 *****************************************************************************/
423 static int Control( demux_t *p_demux, int i_query, va_list args )
425 demux_sys_t *p_sys = p_demux->p_sys;
431 case DEMUX_GET_POSITION:
432 pf = (double*) va_arg( args, double* );
433 i64 = stream_Size( p_demux->s );
436 *pf = (double)stream_Tell( p_demux->s ) / (double)i64;
444 case DEMUX_SET_POSITION:
445 f = (double) va_arg( args, double );
446 i64 = stream_Size( p_demux->s );
447 p_sys->i_current_pts = 0;
448 es_out_Control( p_demux->out, ES_OUT_RESET_PCR );
450 return stream_Seek( p_demux->s, (int64_t)(i64 * f) );
453 pi64 = (int64_t*)va_arg( args, int64_t * );
454 if( p_sys->i_time_track >= 0 && p_sys->i_current_pts > 0 )
456 *pi64 = p_sys->i_current_pts - p_sys->tk[p_sys->i_time_track].i_first_pts;
459 if( p_sys->i_mux_rate > 0 )
461 *pi64 = (int64_t)1000000 * ( stream_Tell( p_demux->s ) / 50 ) /
468 case DEMUX_GET_LENGTH:
469 pi64 = (int64_t*)va_arg( args, int64_t * );
470 if( p_sys->i_length > 0 )
472 *pi64 = p_sys->i_length;
475 else if( p_sys->i_mux_rate > 0 )
477 *pi64 = (int64_t)1000000 * ( stream_Size( p_demux->s ) / 50 ) /
485 i64 = (int64_t)va_arg( args, int64_t );
486 if( p_sys->i_time_track >= 0 && p_sys->i_current_pts > 0 )
488 int64_t i_now = p_sys->i_current_pts - p_sys->tk[p_sys->i_time_track].i_first_pts;
489 int64_t i_pos = stream_Tell( p_demux->s );
490 int64_t i_offset = i_pos / (i_now / 1000000) * ((i64 - i_now) / 1000000);
491 stream_Seek( p_demux->s, i_pos + i_offset);
493 es_out_Control( p_demux->out, ES_OUT_RESET_PCR );
504 /*****************************************************************************
506 *****************************************************************************/
508 /* PSResynch: resynch on a system starcode
509 * It doesn't skip more than 512 bytes
510 * -1 -> error, 0 -> not synch, 1 -> ok
512 static int ps_pkt_resynch( stream_t *s, uint32_t *pi_code )
518 if( stream_Peek( s, &p_peek, 4 ) < 4 )
522 if( p_peek[0] == 0 && p_peek[1] == 0 && p_peek[2] == 1 &&
525 *pi_code = 0x100 | p_peek[3];
529 if( ( i_peek = stream_Peek( s, &p_peek, 512 ) ) < 4 )
541 if( p_peek[0] == 0 && p_peek[1] == 0 && p_peek[2] == 1 &&
544 *pi_code = 0x100 | p_peek[3];
545 return stream_Read( s, NULL, i_skip ) == i_skip ? 1 : -1;
552 return stream_Read( s, NULL, i_skip ) == i_skip ? 0 : -1;
555 static block_t *ps_pkt_read( stream_t *s, uint32_t i_code )
558 int i_peek = stream_Peek( s, &p_peek, 14 );
559 int i_size = ps_pkt_size( p_peek, i_peek );
561 if( i_size <= 6 && p_peek[3] > 0xba )
563 /* Special case, search the next start code */
567 i_peek = stream_Peek( s, &p_peek, i_size + 1024 );
568 if( i_peek <= i_size + 4 )
572 while( i_size <= i_peek - 4 )
574 if( p_peek[i_size] == 0x00 && p_peek[i_size+1] == 0x00 &&
575 p_peek[i_size+2] == 0x01 && p_peek[i_size+3] >= 0xb9 )
577 return stream_Block( s, i_size );
586 return stream_Block( s, i_size );