1 /*****************************************************************************
2 * mpeg_ps.c : Program Stream input module for vlc
3 *****************************************************************************
4 * Copyright (C) 2000-2001 VideoLAN
5 * $Id: mpeg_ps.c,v 1.10 2002/04/10 17:47:58 jobi Exp $
7 * Authors: Christophe Massiot <massiot@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() */
28 #include <string.h> /* strdup() */
31 #include <videolan/vlc.h>
33 #include <sys/types.h>
35 #include "stream_control.h"
36 #include "input_ext-intf.h"
37 #include "input_ext-dec.h"
38 #include "input_ext-plugins.h"
40 /*****************************************************************************
42 *****************************************************************************/
43 #define PS_READ_ONCE 50
45 /*****************************************************************************
47 *****************************************************************************/
48 static void input_getfunctions( function_list_t * p_function_list );
49 static int PSDemux ( struct input_thread_s * );
50 static int PSInit ( struct input_thread_s * );
51 static void PSEnd ( struct input_thread_s * );
53 /*****************************************************************************
54 * Build configuration tree.
55 *****************************************************************************/
60 SET_DESCRIPTION( "ISO 13818-1 MPEG Program Stream input" )
61 ADD_CAPABILITY( DEMUX, 100 )
66 input_getfunctions( &p_module->p_functions->demux );
69 MODULE_DEACTIVATE_START
70 MODULE_DEACTIVATE_STOP
72 /*****************************************************************************
73 * Functions exported as capabilities. They are declared as static so that
74 * we don't pollute the namespace too much.
75 *****************************************************************************/
76 static void input_getfunctions( function_list_t * p_function_list )
78 #define input p_function_list->functions.demux
79 input.pf_init = PSInit;
81 input.pf_demux = PSDemux;
82 input.pf_rewind = NULL;
86 /*****************************************************************************
87 * PSInit: initializes PS structures
88 *****************************************************************************/
89 static int PSInit( input_thread_t * p_input )
93 /* Initialize access plug-in structures. */
94 if( p_input->i_mtu == 0 )
97 p_input->i_bufsize = INPUT_DEFAULT_BUFSIZE;
100 /* Have a peep at the show. */
101 if( input_Peek( p_input, &p_peek, 4 ) < 4 )
103 /* Stream shorter than 4 bytes... */
104 intf_ErrMsg( "input error: cannot peek() (mpeg_ps)" );
108 if( *p_peek || *(p_peek + 1) || *(p_peek + 2) != 1 )
110 if( *p_input->psz_demux && !strncmp( p_input->psz_demux, "ps", 3 ) )
113 intf_ErrMsg( "input error: this doesn't look like an MPEG PS stream, continuing" );
117 intf_WarnMsg( 2, "input: PS plug-in discarded (no startcode)" );
121 else if( *(p_peek + 3) <= 0xb9 )
123 if( *p_input->psz_demux && !strncmp( p_input->psz_demux, "ps", 3 ) )
126 intf_ErrMsg( "input error: this seems to be an elementary stream (ES plug-in ?),");
127 intf_ErrMsg( "but continuing" );
131 intf_WarnMsg( 2, "input: PS plug-in discarded (ES startcode)" );
136 if( input_InitStream( p_input, sizeof( stream_ps_data_t ) ) == -1 )
140 input_AddProgram( p_input, 0, sizeof( stream_ps_data_t ) );
142 p_input->stream.p_selected_program =
143 p_input->stream.pp_programs[0] ;
145 if( p_input->stream.b_seekable )
147 stream_ps_data_t * p_demux_data =
148 (stream_ps_data_t *)p_input->stream.pp_programs[0]->p_demux_data;
150 /* Pre-parse the stream to gather stream_descriptor_t. */
151 p_input->stream.pp_programs[0]->b_is_ok = 0;
152 p_demux_data->i_PSM_version = EMPTY_PSM_VERSION;
154 while( !p_input->b_die && !p_input->b_error
155 && !p_demux_data->b_has_PSM )
158 data_packet_t * p_data;
160 i_result = input_ReadPS( p_input, &p_data );
165 vlc_mutex_lock( &p_input->stream.stream_lock );
166 p_input->stream.pp_programs[0]->b_is_ok = 1;
167 vlc_mutex_unlock( &p_input->stream.stream_lock );
170 else if( i_result == -1 )
172 p_input->b_error = 1;
176 input_ParsePS( p_input, p_data );
177 input_DeletePacket( p_input->p_method_data, p_data );
180 if( p_input->stream.p_selected_area->i_tell >
181 INPUT_PREPARSE_LENGTH )
186 input_AccessReinit( p_input );
187 p_input->pf_seek( p_input, (off_t)0 );
188 vlc_mutex_lock( &p_input->stream.stream_lock );
190 if( p_demux_data->b_has_PSM )
192 /* (The PSM decoder will care about spawning the decoders) */
193 p_input->stream.pp_programs[0]->b_is_ok = 1;
198 /* (We have to do it ourselves) */
201 /* FIXME: we should do multiple passes in case an audio type
204 i_es < p_input->stream.pp_programs[0]->i_es_number;
207 #define p_es p_input->stream.pp_programs[0]->pp_es[i_es]
208 switch( p_es->i_type )
212 input_SelectES( p_input, p_es );
217 if( config_GetIntVariable( "input_channel" )
218 == (p_es->i_id & 0x1F) ||
219 ( config_GetIntVariable( "input_channel" ) < 0
220 && !(p_es->i_id & 0x1F) ) )
221 switch( config_GetIntVariable( "input_audio" ) )
225 input_SelectES( p_input, p_es );
230 if( config_GetIntVariable( "input_channel" )
231 == ((p_es->i_id & 0xF00) >> 8) ||
232 ( config_GetIntVariable( "input_channel" ) < 0
233 && !((p_es->i_id & 0xF00) >> 8) ) )
234 switch( config_GetIntVariable( "input_audio" ) )
238 input_SelectES( p_input, p_es );
243 if( config_GetIntVariable( "input_subtitle" )
244 == ((p_es->i_id & 0x1F00) >> 8) )
246 input_SelectES( p_input, p_es );
251 if( config_GetIntVariable( "input_channel" )
252 == ((p_es->i_id & 0x1F00) >> 8) ||
253 ( config_GetIntVariable( "input_channel" ) < 0
254 && !((p_es->i_id & 0x1F00) >> 8) ) )
255 switch( config_GetIntVariable( "input_audio" ) )
259 input_SelectES( p_input, p_es );
267 if( p_main->b_stats )
269 input_DumpStream( p_input );
271 vlc_mutex_unlock( &p_input->stream.stream_lock );
275 /* The programs will be added when we read them. */
276 vlc_mutex_lock( &p_input->stream.stream_lock );
277 p_input->stream.i_method = INPUT_METHOD_FILE;
278 p_input->stream.pp_programs[0]->b_is_ok = 0;
279 vlc_mutex_unlock( &p_input->stream.stream_lock );
285 /*****************************************************************************
286 * PSEnd: frees unused data
287 *****************************************************************************/
288 static void PSEnd( input_thread_t * p_input )
292 /*****************************************************************************
293 * PSDemux: reads and demuxes data packets
294 *****************************************************************************
295 * Returns -1 in case of error, 0 in case of EOF, otherwise the number of
297 *****************************************************************************/
298 static int PSDemux( input_thread_t * p_input )
302 for( i = 0; i < PS_READ_ONCE; i++ )
304 data_packet_t * p_data;
307 i_result = input_ReadPS( p_input, &p_data );
314 input_DemuxPS( p_input, p_data );