Fix a bunch of warnings and errors
[vlc.git] / modules / audio_mixer / trivial.c
1 /*****************************************************************************
2  * trivial.c : trivial mixer plug-in (1 input, no downmixing)
3  *****************************************************************************
4  * Copyright (C) 2002 the VideoLAN team
5  * $Id$
6  *
7  * Authors: Christophe Massiot <massiot@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., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
22  *****************************************************************************/
23
24 /*****************************************************************************
25  * Preamble
26  *****************************************************************************/
27 #include <stdlib.h>                                      /* malloc(), free() */
28 #include <string.h>
29
30 #include <vlc/vlc.h>
31 #include "audio_output.h"
32 #include "aout_internal.h"
33
34 /*****************************************************************************
35  * Local prototypes
36  *****************************************************************************/
37 static int  Create    ( vlc_object_t * );
38
39 static void DoWork    ( aout_instance_t *, aout_buffer_t * );
40
41 /*****************************************************************************
42  * Module descriptor
43  *****************************************************************************/
44 vlc_module_begin();
45     set_category( CAT_AUDIO );
46     set_subcategory( SUBCAT_AUDIO_MISC );
47     set_description( _("Trivial audio mixer") );
48     set_capability( "audio mixer", 1 );
49     set_callbacks( Create, NULL );
50 vlc_module_end();
51
52 /*****************************************************************************
53  * Create: allocate trivial mixer
54  *****************************************************************************/
55 static int Create( vlc_object_t *p_this )
56 {
57     aout_instance_t * p_aout = (aout_instance_t *)p_this;
58
59     if ( p_aout->mixer.mixer.i_format != VLC_FOURCC('f','l','3','2')
60           && p_aout->mixer.mixer.i_format != VLC_FOURCC('f','i','3','2') )
61     {
62         return -1;
63     }
64
65     p_aout->mixer.pf_do_work = DoWork;
66
67     return 0;
68 }
69
70 /*****************************************************************************
71  * DoWork: mix a new output buffer
72  *****************************************************************************/
73 static void DoWork( aout_instance_t * p_aout, aout_buffer_t * p_buffer )
74 {
75     int i = 0;
76     aout_input_t * p_input = p_aout->pp_inputs[i];
77     int i_nb_channels = aout_FormatNbChannels( &p_aout->mixer.mixer );
78     int i_nb_bytes = p_buffer->i_nb_samples * sizeof(int32_t)
79                       * i_nb_channels;
80     byte_t * p_in;
81     byte_t * p_out;
82
83     while ( p_input->b_error )
84     {
85         p_input = p_aout->pp_inputs[++i];
86         /* This can't crash because if no input has b_error == 0, the
87          * audio mixer cannot run and we can't be here. */
88     }
89     p_in = p_input->p_first_byte_to_mix;
90     p_out = p_buffer->p_buffer;
91
92     for ( ; ; )
93     {
94         ptrdiff_t i_available_bytes = (p_input->fifo.p_first->p_buffer
95                                         - p_in)
96                                         + p_input->fifo.p_first->i_nb_samples
97                                            * sizeof(int32_t)
98                                            * i_nb_channels;
99
100         if ( i_available_bytes < i_nb_bytes )
101         {
102             aout_buffer_t * p_old_buffer;
103
104             if ( i_available_bytes > 0 )
105                 p_aout->p_vlc->pf_memcpy( p_out, p_in, i_available_bytes );
106             i_nb_bytes -= i_available_bytes;
107             p_out += i_available_bytes;
108
109             /* Next buffer */
110             p_old_buffer = aout_FifoPop( p_aout, &p_input->fifo );
111             aout_BufferFree( p_old_buffer );
112             if ( p_input->fifo.p_first == NULL )
113             {
114                 msg_Err( p_aout, "internal amix error" );
115                 return;
116             }
117             p_in = p_input->fifo.p_first->p_buffer;
118         }
119         else
120         {
121             if ( i_nb_bytes > 0 )
122                 p_aout->p_vlc->pf_memcpy( p_out, p_in, i_nb_bytes );
123             p_input->p_first_byte_to_mix = p_in + i_nb_bytes;
124             break;
125         }
126     }
127
128     /* Empty other FIFOs to avoid a memory leak. */
129     for ( i++; i < p_aout->i_nb_inputs; i++ )
130     {
131         aout_fifo_t * p_fifo;
132         aout_buffer_t * p_deleted;
133
134         p_input = p_aout->pp_inputs[i];
135         if ( p_input->b_error ) continue;
136         p_fifo = &p_input->fifo;
137         p_deleted = p_fifo->p_first;
138         while ( p_deleted != NULL )
139         {
140             aout_buffer_t * p_next = p_deleted->p_next;
141             aout_BufferFree( p_deleted );
142             p_deleted = p_next;
143         }
144         p_fifo->p_first = NULL;
145         p_fifo->pp_last = &p_fifo->p_first;
146     }
147 }
148