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_capability( "demux2", 1 );
49 set_callbacks( Open, Close );
53 set_description( _("PS demuxer") );
54 set_capability( "demux2", 9 );
55 set_callbacks( OpenAlt, Close );
58 /*****************************************************************************
60 *****************************************************************************/
65 ps_track_t tk[PS_TK_COUNT];
71 static int Demux ( demux_t *p_demux );
72 static int Control( demux_t *p_demux, int i_query, va_list args );
74 static int ps_pkt_resynch( stream_t *, uint32_t *pi_code );
75 static block_t *ps_pkt_read ( stream_t *, uint32_t i_code );
77 /*****************************************************************************
79 *****************************************************************************/
80 static int Open( vlc_object_t *p_this )
82 demux_t *p_demux = (demux_t*)p_this;
87 if( stream_Peek( p_demux->s, &p_peek, 4 ) < 4 )
89 msg_Err( p_demux, "cannot peek" );
93 if( p_peek[0] != 0 || p_peek[1] != 0 ||
94 p_peek[2] != 1 || p_peek[3] < 0xb9 )
96 msg_Warn( p_demux, "this does not look like an MPEG PS stream, "
97 "continuing anyway" );
100 /* Fill p_demux field */
101 p_demux->pf_demux = Demux;
102 p_demux->pf_control = Control;
103 p_demux->p_sys = p_sys = malloc( sizeof( demux_sys_t ) );
106 p_sys->i_mux_rate = 0;
109 ps_psm_init( &p_sys->psm );
110 ps_track_init( p_sys->tk );
112 /* TODO prescanning of ES */
117 static int OpenAlt( vlc_object_t *p_this )
119 demux_t *p_demux = (demux_t*)p_this;
122 if( stream_Peek( p_demux->s, &p_peek, 4 ) < 4 )
124 msg_Err( p_demux, "cannot peek" );
128 if( p_peek[0] != 0 || p_peek[1] != 0 ||
129 p_peek[2] != 1 || p_peek[3] < 0xb9 )
131 if( !p_demux->b_force ) return VLC_EGENERIC;
134 return Open( p_this );
137 /*****************************************************************************
139 *****************************************************************************/
140 static void Close( vlc_object_t *p_this )
142 demux_t *p_demux = (demux_t*)p_this;
143 demux_sys_t *p_sys = p_demux->p_sys;
146 for( i = 0; i < PS_TK_COUNT; i++ )
148 ps_track_t *tk = &p_sys->tk[i];
151 es_format_Clean( &tk->fmt );
152 if( tk->es ) es_out_Del( p_demux->out, tk->es );
156 ps_psm_destroy( &p_sys->psm );
161 /*****************************************************************************
163 *****************************************************************************/
164 static int Demux( demux_t *p_demux )
166 demux_sys_t *p_sys = p_demux->p_sys;
167 int i_ret, i_id, i_mux_rate;
171 i_ret = ps_pkt_resynch( p_demux->s, &i_code );
176 else if( i_ret == 0 )
178 msg_Warn( p_demux, "garbage at input" );
182 if( ( p_pkt = ps_pkt_read( p_demux->s, i_code ) ) == NULL )
190 block_Release( p_pkt );
194 if( !ps_pkt_parse_pack( p_pkt, &p_sys->i_scr, &i_mux_rate ) )
196 /* done later on to work around bad vcd/svcd streams */
197 /* es_out_Control( p_demux->out, ES_OUT_SET_PCR, p_sys->i_scr ); */
198 if( i_mux_rate > 0 ) p_sys->i_mux_rate = i_mux_rate;
200 block_Release( p_pkt );
204 if( !ps_pkt_parse_system( p_pkt, &p_sys->psm, p_sys->tk ) )
207 for( i = 0; i < PS_TK_COUNT; i++ )
209 ps_track_t *tk = &p_sys->tk[i];
211 if( tk->b_seen && !tk->es && tk->fmt.i_cat != UNKNOWN_ES )
213 tk->es = es_out_Add( p_demux->out, &tk->fmt );
217 block_Release( p_pkt );
221 /* msg_Dbg( p_demux, "received PSM"); */
222 ps_psm_fill( &p_sys->psm, p_pkt, p_sys->tk, p_demux->out );
223 block_Release( p_pkt );
227 if( (i_id = ps_pkt_id( p_pkt )) >= 0xc0 )
229 ps_track_t *tk = &p_sys->tk[PS_ID_TO_TK(i_id)];
233 if( !ps_track_fill( tk, &p_sys->psm, i_id ) )
235 tk->es = es_out_Add( p_demux->out, &tk->fmt );
237 tk->b_seen = VLC_TRUE;
240 /* The popular VCD/SVCD subtitling WinSubMux does not
241 * renumber the SCRs when merging subtitles into the PES */
243 ( tk->fmt.i_codec == VLC_FOURCC('o','g','t',' ') ||
244 tk->fmt.i_codec == VLC_FOURCC('c','v','d',' ') ) )
249 if( p_sys->i_scr > 0 )
250 es_out_Control( p_demux->out, ES_OUT_SET_PCR, p_sys->i_scr );
254 if( tk->b_seen && tk->es &&
255 !ps_pkt_parse_pes( p_pkt, tk->i_skip ) )
257 es_out_Send( p_demux->out, tk->es, p_pkt );
261 block_Release( p_pkt );
266 block_Release( p_pkt );
274 /*****************************************************************************
276 *****************************************************************************/
277 static int Control( demux_t *p_demux, int i_query, va_list args )
279 demux_sys_t *p_sys = p_demux->p_sys;
285 case DEMUX_GET_POSITION:
286 pf = (double*) va_arg( args, double* );
287 i64 = stream_Size( p_demux->s );
290 *pf = (double)stream_Tell( p_demux->s ) / (double)i64;
298 case DEMUX_SET_POSITION:
299 f = (double) va_arg( args, double );
300 i64 = stream_Size( p_demux->s );
302 es_out_Control( p_demux->out, ES_OUT_RESET_PCR );
304 return stream_Seek( p_demux->s, (int64_t)(i64 * f) );
307 pi64 = (int64_t*)va_arg( args, int64_t * );
308 if( p_sys->i_mux_rate > 0 )
310 *pi64 = (int64_t)1000000 * ( stream_Tell( p_demux->s ) / 50 ) /
317 case DEMUX_GET_LENGTH:
318 pi64 = (int64_t*)va_arg( args, int64_t * );
319 if( p_sys->i_mux_rate > 0 )
321 *pi64 = (int64_t)1000000 * ( stream_Size( p_demux->s ) / 50 ) /
335 /*****************************************************************************
337 *****************************************************************************/
339 /* PSResynch: resynch on a system starcode
340 * It doesn't skip more than 512 bytes
341 * -1 -> error, 0 -> not synch, 1 -> ok
343 static int ps_pkt_resynch( stream_t *s, uint32_t *pi_code )
349 if( stream_Peek( s, &p_peek, 4 ) < 4 )
353 if( p_peek[0] == 0 && p_peek[1] == 0 && p_peek[2] == 1 &&
356 *pi_code = 0x100 | p_peek[3];
360 if( ( i_peek = stream_Peek( s, &p_peek, 512 ) ) < 4 )
372 if( p_peek[0] == 0 && p_peek[1] == 0 && p_peek[2] == 1 &&
375 *pi_code = 0x100 | p_peek[3];
376 return stream_Read( s, NULL, i_skip ) == i_skip ? 1 : -1;
383 return stream_Read( s, NULL, i_skip ) == i_skip ? 0 : -1;
386 static block_t *ps_pkt_read( stream_t *s, uint32_t i_code )
389 int i_peek = stream_Peek( s, &p_peek, 14 );
390 int i_size = ps_pkt_size( p_peek, i_peek );
392 if( i_size <= 6 && p_peek[3] > 0xba )
394 /* Special case, search the next start code */
398 i_peek = stream_Peek( s, &p_peek, i_size + 1024 );
399 if( i_peek <= i_size + 4 )
403 while( i_size <= i_peek - 4 )
405 if( p_peek[i_size] == 0x00 && p_peek[i_size+1] == 0x00 &&
406 p_peek[i_size+2] == 0x01 && p_peek[i_size+3] >= 0xb9 )
408 return stream_Block( s, i_size );
417 return stream_Block( s, i_size );