1 /*****************************************************************************
2 * aout_dummy.c : dummy audio output plugin
3 *****************************************************************************
4 * Copyright (C) 2000, 2001 VideoLAN
5 * $Id: aout_dummy.c,v 1.17 2001/12/30 07:09:55 sam Exp $
7 * Authors: Samuel Hocevar <sam@zoy.org>
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 *****************************************************************************/
29 #include <videolan/vlc.h>
31 #include "audio_output.h" /* aout_thread_t */
33 /*****************************************************************************
34 * vout_dummy_t: dummy video output method descriptor
35 *****************************************************************************
36 * This structure is part of the video output thread descriptor.
37 * It describes the dummy specific properties of an output thread.
38 *****************************************************************************/
39 typedef struct aout_sys_s
41 /* Prevent malloc(0) */
46 /*****************************************************************************
48 *****************************************************************************/
49 static int aout_Probe ( probedata_t *p_data );
50 static int aout_Open ( aout_thread_t *p_aout );
51 static int aout_SetFormat ( aout_thread_t *p_aout );
52 static long aout_GetBufInfo ( aout_thread_t *p_aout, long l_buffer_info );
53 static void aout_Play ( aout_thread_t *p_aout,
54 byte_t *buffer, int i_size );
55 static void aout_Close ( aout_thread_t *p_aout );
57 /*****************************************************************************
58 * Functions exported as capabilities. They are declared as static so that
59 * we don't pollute the namespace too much.
60 *****************************************************************************/
61 void _M( aout_getfunctions )( function_list_t * p_function_list )
63 p_function_list->pf_probe = aout_Probe;
64 p_function_list->functions.aout.pf_open = aout_Open;
65 p_function_list->functions.aout.pf_setformat = aout_SetFormat;
66 p_function_list->functions.aout.pf_getbufinfo = aout_GetBufInfo;
67 p_function_list->functions.aout.pf_play = aout_Play;
68 p_function_list->functions.aout.pf_close = aout_Close;
71 /*****************************************************************************
72 * aout_Probe: probe the audio device and return a score
73 *****************************************************************************/
74 static int aout_Probe( probedata_t *p_data )
79 /*****************************************************************************
80 * aout_Open: opens a dummy audio device
81 *****************************************************************************/
82 static int aout_Open( aout_thread_t *p_aout )
84 /* Initialize some variables */
85 p_aout->i_format = AOUT_FORMAT_DEFAULT;
86 p_aout->i_channels = 1 + main_GetIntVariable( AOUT_STEREO_VAR,
87 AOUT_STEREO_DEFAULT );
88 p_aout->l_rate = main_GetIntVariable( AOUT_RATE_VAR,
94 /*****************************************************************************
95 * aout_SetFormat: pretends to set the dsp output format
96 *****************************************************************************/
97 static int aout_SetFormat( aout_thread_t *p_aout )
99 p_aout->i_latency = 0;
104 /*****************************************************************************
105 * aout_GetBufInfo: returns available bytes in buffer
106 *****************************************************************************/
107 static long aout_GetBufInfo( aout_thread_t *p_aout, long l_buffer_limit )
109 return( sizeof(s16) * l_buffer_limit + 1 ); /* value big enough to sleep */
112 /*****************************************************************************
113 * aout_Play: pretends to play a sound
114 *****************************************************************************/
115 static void aout_Play( aout_thread_t *p_aout, byte_t *buffer, int i_size )
120 /*****************************************************************************
121 * aout_Close: closes the dummy audio device
122 *****************************************************************************/
123 static void aout_Close( aout_thread_t *p_aout )