]> git.sesse.net Git - vlc/blob - modules/demux/flac.c
added a demux and decoder for flac files (disabled by default). Works for
[vlc] / modules / demux / flac.c
1 /*****************************************************************************
2  * a52sys.c : A/52 input module for vlc
3  *****************************************************************************
4  * Copyright (C) 2001 VideoLAN
5  * $Id: flac.c,v 1.1 2003/02/23 16:31:48 sigmunau Exp $
6  *
7  * Authors: Arnaud de Bossoreille de Ribou <bozo@via.ecp.fr>
8  *
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.
13  * 
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.
18  *
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  *****************************************************************************/
23
24 /*****************************************************************************
25  * Preamble
26  *****************************************************************************/
27 #include <stdlib.h>                                      /* malloc(), free() */
28 #include <string.h>                                              /* strdup() */
29 #include <errno.h>
30
31 #include <vlc/vlc.h>
32 #include <vlc/input.h>
33
34 #include <sys/types.h>
35
36 /*****************************************************************************
37  * Constants
38  *****************************************************************************/
39 #define A52_PACKET_SIZE 16384
40 #define MAX_PACKETS_IN_FIFO 1
41
42 /*****************************************************************************
43  * Local prototypes
44  *****************************************************************************/
45 static int  Init  ( vlc_object_t * );
46 static int  Demux ( input_thread_t * );
47
48 /*****************************************************************************
49  * Module descriptor
50  *****************************************************************************/
51 vlc_module_begin();                                      
52     set_description( "flac demuxer" );                       
53     set_capability( "demux", 155 );
54     set_callbacks( Init, NULL );
55     add_shortcut( "flac" );
56 vlc_module_end();
57
58 /*****************************************************************************
59  * Init: initializes ES structures
60  *****************************************************************************/
61 static int Init( vlc_object_t * p_this )
62 {
63     input_thread_t *    p_input = (input_thread_t *)p_this;
64     es_descriptor_t *   p_es;
65     byte_t *            p_peek;
66
67     /* Initialize access plug-in structures. */
68     if( p_input->i_mtu == 0 )
69     {
70         /* Improve speed. */
71         p_input->i_bufsize = INPUT_DEFAULT_BUFSIZE;
72     }
73
74     p_input->pf_demux = Demux;
75     p_input->pf_rewind = NULL;
76
77     /* Have a peep at the show. */
78     if( input_Peek( p_input, &p_peek, 4 ) < 4 )
79     {
80         /* Stream shorter than 4 bytes... */
81         msg_Err( p_input, "cannot peek()" );
82         return( -1 );
83     }
84
85     if( *p_peek != 'f' || *(p_peek + 1) != 'L' || *(p_peek +2) != 'a'
86         || *(p_peek+3) != 'C')
87     {
88         if( *p_input->psz_demux && !strncmp( p_input->psz_demux, "flac", 4 ) )
89         {
90             /* User forced */
91             msg_Err( p_input, "this doesn't look like an flac stream, continuing" );
92         }
93         else
94         {
95             msg_Warn( p_input, "flac module discarded (no startcode)" );
96             return( -1 );
97         }
98     }
99
100     if( input_InitStream( p_input, 0 ) == -1 )
101     {
102         return( -1 );
103     }
104     input_AddProgram( p_input, 0, 0 );
105     p_input->stream.p_selected_program = p_input->stream.pp_programs[0];
106     vlc_mutex_lock( &p_input->stream.stream_lock );
107     p_es = input_AddES( p_input, p_input->stream.p_selected_program, 0xBD, 0 );
108     p_es->i_stream_id = 0xBD;
109     p_es->i_fourcc = VLC_FOURCC('f','l','a','c');
110     p_es->i_cat = AUDIO_ES;
111     input_SelectES( p_input, p_es );
112     p_input->stream.p_selected_area->i_tell = 0;
113     p_input->stream.p_selected_program->b_is_ok = 1;
114     vlc_mutex_unlock( &p_input->stream.stream_lock );
115
116     return( 0 );
117 }
118
119 /*****************************************************************************
120  * Demux: reads and demuxes data packets
121  *****************************************************************************
122  * Returns -1 in case of error, 0 in case of EOF, 1 otherwise
123  *****************************************************************************/
124 static int Demux( input_thread_t * p_input )
125 {
126     ssize_t         i_read;
127     decoder_fifo_t * p_fifo =
128         p_input->stream.p_selected_program->pp_es[0]->p_decoder_fifo;
129     pes_packet_t *  p_pes;
130     data_packet_t * p_data;
131
132     if( p_fifo == NULL )
133     {
134         return -1;
135     }
136
137     i_read = input_SplitBuffer( p_input, &p_data, A52_PACKET_SIZE );
138
139     if ( i_read <= 0 )
140     {
141         return i_read;
142     }
143
144     p_pes = input_NewPES( p_input->p_method_data );
145
146     if( p_pes == NULL )
147     {
148         msg_Err( p_input, "out of memory" );
149         input_DeletePacket( p_input->p_method_data, p_data );
150         return( -1 );
151     }
152
153     p_pes->i_rate = p_input->stream.control.i_rate;
154     p_pes->p_first = p_pes->p_last = p_data;
155     p_pes->i_pes_size = i_read;
156     p_pes->i_nb_data = 1;
157
158     vlc_mutex_lock( &p_fifo->data_lock );
159     if( p_fifo->i_depth >= MAX_PACKETS_IN_FIFO )
160     {
161         /* Wait for the decoder. */
162         vlc_cond_wait( &p_fifo->data_wait, &p_fifo->data_lock );
163     }
164     vlc_mutex_unlock( &p_fifo->data_lock );
165
166     if( (p_input->stream.p_selected_program->i_synchro_state == SYNCHRO_REINIT)
167        |(p_input->stream.p_selected_program->i_synchro_state == SYNCHRO_START)
168          | (input_ClockManageControl( p_input, 
169                       p_input->stream.p_selected_program,
170                          (mtime_t)0 ) == PAUSE_S) )
171     {
172         msg_Warn( p_input, "synchro reinit" );
173         p_pes->i_pts = mdate() + DEFAULT_PTS_DELAY;
174         p_input->stream.p_selected_program->i_synchro_state = SYNCHRO_OK;
175     }
176
177     input_DecodePES( p_fifo, p_pes );
178
179     return 1;
180 }
181