1 /*****************************************************************************
2 * ps.c: Program Stream demux module for VLC.
3 *****************************************************************************
4 * Copyright (C) 2004 VideoLAN
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., 59 Temple Place - Suite 330, Boston, MA 02111, USA.
22 *****************************************************************************/
24 /*****************************************************************************
26 *****************************************************************************/
27 #include <stdlib.h> /* malloc(), free() */
30 #include <vlc/input.h>
35 * - re-add pre-scanning.
39 /*****************************************************************************
41 *****************************************************************************/
42 static int Open ( vlc_object_t * );
43 static int OpenAlt( vlc_object_t * );
44 static void Close ( vlc_object_t * );
47 set_description( _("PS demuxer") );
48 set_category( CAT_INPUT );
49 set_subcategory( SUBCAT_INPUT_DEMUX );
50 set_capability( "demux2", 1 );
51 set_callbacks( Open, Close );
55 set_description( _("PS demuxer") );
56 set_capability( "demux2", 9 );
57 set_callbacks( OpenAlt, Close );
60 /*****************************************************************************
62 *****************************************************************************/
67 ps_track_t tk[PS_TK_COUNT];
73 static int Demux ( demux_t *p_demux );
74 static int Control( demux_t *p_demux, int i_query, va_list args );
76 static int ps_pkt_resynch( stream_t *, uint32_t *pi_code );
77 static block_t *ps_pkt_read ( stream_t *, uint32_t i_code );
79 /*****************************************************************************
81 *****************************************************************************/
82 static int Open( vlc_object_t *p_this )
84 demux_t *p_demux = (demux_t*)p_this;
89 if( stream_Peek( p_demux->s, &p_peek, 4 ) < 4 )
91 msg_Err( p_demux, "cannot peek" );
95 if( p_peek[0] != 0 || p_peek[1] != 0 ||
96 p_peek[2] != 1 || p_peek[3] < 0xb9 )
98 msg_Warn( p_demux, "this does not look like an MPEG PS stream, "
99 "continuing anyway" );
102 /* Fill p_demux field */
103 p_demux->pf_demux = Demux;
104 p_demux->pf_control = Control;
105 p_demux->p_sys = p_sys = malloc( sizeof( demux_sys_t ) );
108 p_sys->i_mux_rate = 0;
111 ps_psm_init( &p_sys->psm );
112 ps_track_init( p_sys->tk );
114 /* TODO prescanning of ES */
119 static int OpenAlt( vlc_object_t *p_this )
121 demux_t *p_demux = (demux_t*)p_this;
124 if( stream_Peek( p_demux->s, &p_peek, 4 ) < 4 )
126 msg_Err( p_demux, "cannot peek" );
130 if( p_peek[0] != 0 || p_peek[1] != 0 ||
131 p_peek[2] != 1 || p_peek[3] < 0xb9 )
133 if( !p_demux->b_force ) return VLC_EGENERIC;
136 return Open( p_this );
139 /*****************************************************************************
141 *****************************************************************************/
142 static void Close( vlc_object_t *p_this )
144 demux_t *p_demux = (demux_t*)p_this;
145 demux_sys_t *p_sys = p_demux->p_sys;
148 for( i = 0; i < PS_TK_COUNT; i++ )
150 ps_track_t *tk = &p_sys->tk[i];
153 es_format_Clean( &tk->fmt );
154 if( tk->es ) es_out_Del( p_demux->out, tk->es );
158 ps_psm_destroy( &p_sys->psm );
163 /*****************************************************************************
165 *****************************************************************************/
166 static int Demux( demux_t *p_demux )
168 demux_sys_t *p_sys = p_demux->p_sys;
169 int i_ret, i_id, i_mux_rate;
173 i_ret = ps_pkt_resynch( p_demux->s, &i_code );
178 else if( i_ret == 0 )
180 msg_Warn( p_demux, "garbage at input" );
184 if( ( p_pkt = ps_pkt_read( p_demux->s, i_code ) ) == NULL )
192 block_Release( p_pkt );
196 if( !ps_pkt_parse_pack( p_pkt, &p_sys->i_scr, &i_mux_rate ) )
198 /* done later on to work around bad vcd/svcd streams */
199 /* es_out_Control( p_demux->out, ES_OUT_SET_PCR, p_sys->i_scr ); */
200 if( i_mux_rate > 0 ) p_sys->i_mux_rate = i_mux_rate;
202 block_Release( p_pkt );
206 if( !ps_pkt_parse_system( p_pkt, &p_sys->psm, p_sys->tk ) )
209 for( i = 0; i < PS_TK_COUNT; i++ )
211 ps_track_t *tk = &p_sys->tk[i];
213 if( tk->b_seen && !tk->es && tk->fmt.i_cat != UNKNOWN_ES )
215 tk->es = es_out_Add( p_demux->out, &tk->fmt );
219 block_Release( p_pkt );
223 if( p_sys->psm.i_version == 0xFFFF )
224 msg_Dbg( p_demux, "contains a PSM");
226 ps_psm_fill( &p_sys->psm, p_pkt, p_sys->tk, p_demux->out );
227 block_Release( p_pkt );
231 if( (i_id = ps_pkt_id( p_pkt )) >= 0xc0 )
233 ps_track_t *tk = &p_sys->tk[PS_ID_TO_TK(i_id)];
237 if( !ps_track_fill( tk, &p_sys->psm, i_id ) )
239 tk->es = es_out_Add( p_demux->out, &tk->fmt );
243 msg_Dbg( p_demux, "es id=0x%x format unknown", i_id );
245 tk->b_seen = VLC_TRUE;
248 /* The popular VCD/SVCD subtitling WinSubMux does not
249 * renumber the SCRs when merging subtitles into the PES */
251 ( tk->fmt.i_codec == VLC_FOURCC('o','g','t',' ') ||
252 tk->fmt.i_codec == VLC_FOURCC('c','v','d',' ') ) )
257 if( p_sys->i_scr > 0 )
258 es_out_Control( p_demux->out, ES_OUT_SET_PCR, p_sys->i_scr );
262 if( tk->b_seen && tk->es &&
263 !ps_pkt_parse_pes( p_pkt, tk->i_skip ) )
265 es_out_Send( p_demux->out, tk->es, p_pkt );
269 block_Release( p_pkt );
274 block_Release( p_pkt );
282 /*****************************************************************************
284 *****************************************************************************/
285 static int Control( demux_t *p_demux, int i_query, va_list args )
287 demux_sys_t *p_sys = p_demux->p_sys;
293 case DEMUX_GET_POSITION:
294 pf = (double*) va_arg( args, double* );
295 i64 = stream_Size( p_demux->s );
298 *pf = (double)stream_Tell( p_demux->s ) / (double)i64;
306 case DEMUX_SET_POSITION:
307 f = (double) va_arg( args, double );
308 i64 = stream_Size( p_demux->s );
310 es_out_Control( p_demux->out, ES_OUT_RESET_PCR );
312 return stream_Seek( p_demux->s, (int64_t)(i64 * f) );
315 pi64 = (int64_t*)va_arg( args, int64_t * );
316 if( p_sys->i_mux_rate > 0 )
318 *pi64 = (int64_t)1000000 * ( stream_Tell( p_demux->s ) / 50 ) /
325 case DEMUX_GET_LENGTH:
326 pi64 = (int64_t*)va_arg( args, int64_t * );
327 if( p_sys->i_mux_rate > 0 )
329 *pi64 = (int64_t)1000000 * ( stream_Size( p_demux->s ) / 50 ) /
343 /*****************************************************************************
345 *****************************************************************************/
347 /* PSResynch: resynch on a system starcode
348 * It doesn't skip more than 512 bytes
349 * -1 -> error, 0 -> not synch, 1 -> ok
351 static int ps_pkt_resynch( stream_t *s, uint32_t *pi_code )
357 if( stream_Peek( s, &p_peek, 4 ) < 4 )
361 if( p_peek[0] == 0 && p_peek[1] == 0 && p_peek[2] == 1 &&
364 *pi_code = 0x100 | p_peek[3];
368 if( ( i_peek = stream_Peek( s, &p_peek, 512 ) ) < 4 )
380 if( p_peek[0] == 0 && p_peek[1] == 0 && p_peek[2] == 1 &&
383 *pi_code = 0x100 | p_peek[3];
384 return stream_Read( s, NULL, i_skip ) == i_skip ? 1 : -1;
391 return stream_Read( s, NULL, i_skip ) == i_skip ? 0 : -1;
394 static block_t *ps_pkt_read( stream_t *s, uint32_t i_code )
397 int i_peek = stream_Peek( s, &p_peek, 14 );
398 int i_size = ps_pkt_size( p_peek, i_peek );
400 if( i_size <= 6 && p_peek[3] > 0xba )
402 /* Special case, search the next start code */
406 i_peek = stream_Peek( s, &p_peek, i_size + 1024 );
407 if( i_peek <= i_size + 4 )
411 while( i_size <= i_peek - 4 )
413 if( p_peek[i_size] == 0x00 && p_peek[i_size+1] == 0x00 &&
414 p_peek[i_size+2] == 0x01 && p_peek[i_size+3] >= 0xb9 )
416 return stream_Block( s, i_size );
425 return stream_Block( s, i_size );