1 /*****************************************************************************
2 * mpeg_es.c : Elementary Stream input module for vlc
3 *****************************************************************************
4 * Copyright (C) 2001 VideoLAN
5 * $Id: es.c,v 1.3 2003/05/05 22:23:36 gbazin 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 <vlc/input.h>
33 /*****************************************************************************
35 *****************************************************************************/
36 #define ES_PACKET_SIZE 65536
37 #define MAX_PACKETS_IN_FIFO 3
39 /*****************************************************************************
41 *****************************************************************************/
42 static int Activate ( vlc_object_t * );
43 static int Demux ( input_thread_t * );
45 /*****************************************************************************
47 *****************************************************************************/
49 set_description( _("ISO 13818-1 MPEG Elementary Stream input") );
50 set_capability( "demux", 150 );
51 set_callbacks( Activate, NULL );
56 * Data reading functions
59 /*****************************************************************************
60 * Activate: initializes ES structures
61 *****************************************************************************/
62 static int Activate( vlc_object_t * p_this )
64 input_thread_t * p_input = (input_thread_t *)p_this;
65 es_descriptor_t * p_es;
68 /* Set the demux function */
69 p_input->pf_demux = Demux;
71 /* Initialize access plug-in structures. */
72 if( p_input->i_mtu == 0 )
75 p_input->i_bufsize = INPUT_DEFAULT_BUFSIZE;
78 /* Have a peep at the show. */
79 if( input_Peek( p_input, &p_peek, 4 ) < 4 )
81 /* Stream shorter than 4 bytes... */
82 msg_Err( p_input, "cannot peek()" );
86 if( *p_peek || *(p_peek + 1) || *(p_peek + 2) != 1 )
88 if( *p_input->psz_demux && !strncmp( p_input->psz_demux, "es", 3 ) )
91 msg_Err( p_input, "this doesn't look like an MPEG ES stream, continuing" );
95 msg_Warn( p_input, "ES module discarded (no startcode)" );
99 else if( *(p_peek + 3) > 0xb9 )
101 if( *p_input->psz_demux && !strncmp( p_input->psz_demux, "es", 3 ) )
104 msg_Err( p_input, "this seems to be a system stream (PS plug-in ?), but continuing" );
108 msg_Warn( p_input, "ES module discarded (system startcode)" );
113 if( input_InitStream( p_input, 0 ) == -1 )
117 input_AddProgram( p_input, 0, 0 );
118 p_input->stream.p_selected_program = p_input->stream.pp_programs[0];
119 vlc_mutex_lock( &p_input->stream.stream_lock );
120 p_es = input_AddES( p_input, p_input->stream.p_selected_program, 0xE0,
122 p_es->i_stream_id = 0xE0;
123 p_es->i_fourcc = VLC_FOURCC('m','p','g','v');
124 input_SelectES( p_input, p_es );
125 p_input->stream.p_selected_area->i_tell = 0;
126 p_input->stream.p_selected_program->b_is_ok = 1;
127 vlc_mutex_unlock( &p_input->stream.stream_lock );
132 /*****************************************************************************
133 * Demux: reads and demuxes data packets
134 *****************************************************************************
135 * Returns -1 in case of error, 0 in case of EOF, 1 otherwise
136 *****************************************************************************/
137 static int Demux( input_thread_t * p_input )
140 decoder_fifo_t * p_fifo =
141 p_input->stream.p_selected_program->pp_es[0]->p_decoder_fifo;
142 pes_packet_t * p_pes;
143 data_packet_t * p_data;
150 i_read = input_SplitBuffer( p_input, &p_data, ES_PACKET_SIZE );
157 p_pes = input_NewPES( p_input->p_method_data );
161 msg_Err( p_input, "out of memory" );
162 input_DeletePacket( p_input->p_method_data, p_data );
166 p_pes->i_rate = p_input->stream.control.i_rate;
167 p_pes->p_first = p_pes->p_last = p_data;
168 p_pes->i_nb_data = 1;
170 vlc_mutex_lock( &p_fifo->data_lock );
172 if( p_fifo->i_depth >= MAX_PACKETS_IN_FIFO )
174 /* Wait for the decoder. */
175 vlc_cond_wait( &p_fifo->data_wait, &p_fifo->data_lock );
177 vlc_mutex_unlock( &p_fifo->data_lock );
179 if( (p_input->stream.p_selected_program->i_synchro_state == SYNCHRO_REINIT)
180 | (input_ClockManageControl( p_input,
181 p_input->stream.p_selected_program,
182 (mtime_t)0 ) == PAUSE_S) )
184 msg_Warn( p_input, "synchro reinit" );
185 p_pes->i_pts = mdate() + DEFAULT_PTS_DELAY;
186 p_input->stream.p_selected_program->i_synchro_state = SYNCHRO_OK;
189 input_DecodePES( p_fifo, p_pes );