1 /*****************************************************************************
2 * a52sys.c : A/52 input module for vlc
3 *****************************************************************************
4 * Copyright (C) 2001 VideoLAN
5 * $Id: a52sys.c,v 1.2 2003/02/27 13:19:43 gbazin Exp $
7 * Authors: Arnaud de Bossoreille de Ribou <bozo@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() */
32 #include <vlc/input.h>
34 #include <sys/types.h>
36 /*****************************************************************************
38 *****************************************************************************/
39 #define A52_PACKET_SIZE 16384
40 #define MAX_PACKETS_IN_FIFO 3
42 /*****************************************************************************
44 *****************************************************************************/
45 static int Init ( vlc_object_t * );
46 static int Demux ( input_thread_t * );
48 /*****************************************************************************
50 *****************************************************************************/
52 set_description( _("A52 demuxer") );
53 set_capability( "demux", 155 );
54 set_callbacks( Init, NULL );
55 add_shortcut( "a52" );
58 /*****************************************************************************
59 * Init: initializes ES structures
60 *****************************************************************************/
61 static int Init( vlc_object_t * p_this )
63 input_thread_t * p_input = (input_thread_t *)p_this;
64 es_descriptor_t * p_es;
67 /* Initialize access plug-in structures. */
68 if( p_input->i_mtu == 0 )
71 p_input->i_bufsize = INPUT_DEFAULT_BUFSIZE;
74 p_input->pf_demux = Demux;
75 p_input->pf_rewind = NULL;
77 /* Have a peep at the show. */
78 if( input_Peek( p_input, &p_peek, 2 ) < 2 )
80 /* Stream shorter than 4 bytes... */
81 msg_Err( p_input, "cannot peek()" );
85 if( *p_peek != 0x0b || *(p_peek + 1) != 0x77 )
87 if( *p_input->psz_demux && !strncmp( p_input->psz_demux, "a52", 3 ) )
90 msg_Err( p_input, "this doesn't look like an a52 stream, continuing" );
94 msg_Warn( p_input, "a52 module discarded (no startcode)" );
99 if( input_InitStream( p_input, 0 ) == -1 )
103 input_AddProgram( p_input, 0, 0 );
104 p_input->stream.p_selected_program = p_input->stream.pp_programs[0];
105 vlc_mutex_lock( &p_input->stream.stream_lock );
106 p_es = input_AddES( p_input, p_input->stream.p_selected_program, 0xBD, 0 );
107 p_es->i_stream_id = 0xBD;
108 p_es->i_fourcc = VLC_FOURCC('a','5','2',' ');
109 p_es->i_cat = AUDIO_ES;
110 input_SelectES( p_input, p_es );
111 p_input->stream.p_selected_area->i_tell = 0;
112 p_input->stream.p_selected_program->b_is_ok = 1;
113 vlc_mutex_unlock( &p_input->stream.stream_lock );
118 /*****************************************************************************
119 * Demux: reads and demuxes data packets
120 *****************************************************************************
121 * Returns -1 in case of error, 0 in case of EOF, 1 otherwise
122 *****************************************************************************/
123 static int Demux( input_thread_t * p_input )
126 decoder_fifo_t * p_fifo =
127 p_input->stream.p_selected_program->pp_es[0]->p_decoder_fifo;
128 pes_packet_t * p_pes;
129 data_packet_t * p_data;
136 i_read = input_SplitBuffer( p_input, &p_data, A52_PACKET_SIZE );
143 p_pes = input_NewPES( p_input->p_method_data );
147 msg_Err( p_input, "out of memory" );
148 input_DeletePacket( p_input->p_method_data, p_data );
152 p_pes->i_rate = p_input->stream.control.i_rate;
153 p_pes->p_first = p_pes->p_last = p_data;
154 p_pes->i_nb_data = 1;
156 vlc_mutex_lock( &p_fifo->data_lock );
157 if( p_fifo->i_depth >= MAX_PACKETS_IN_FIFO )
159 /* Wait for the decoder. */
160 vlc_cond_wait( &p_fifo->data_wait, &p_fifo->data_lock );
162 vlc_mutex_unlock( &p_fifo->data_lock );
164 if( (p_input->stream.p_selected_program->i_synchro_state == SYNCHRO_REINIT)
165 |(p_input->stream.p_selected_program->i_synchro_state == SYNCHRO_START)
166 | (input_ClockManageControl( p_input,
167 p_input->stream.p_selected_program,
168 (mtime_t)0 ) == PAUSE_S) )
170 msg_Warn( p_input, "synchro reinit" );
171 p_pes->i_pts = mdate() + DEFAULT_PTS_DELAY;
172 p_input->stream.p_selected_program->i_synchro_state = SYNCHRO_OK;
175 input_DecodePES( p_fifo, p_pes );