1 /*****************************************************************************
3 *****************************************************************************
4 * Copyright (C) 2001-2002 the VideoLAN team
7 * Authors: Emmanuel Blindauer <manu@agat.net>
8 * Samuel Hocevar <sam@zoy.org>
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License as published by
12 * the Free Software Foundation; either version 2 of the License, or
13 * (at your option) any later version.
15 * This program is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 * GNU General Public License for more details.
20 * You should have received a copy of the GNU General Public License
21 * along with this program; if not, write to the Free Software
22 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
23 *****************************************************************************/
25 /*****************************************************************************
27 *****************************************************************************/
28 #include <unistd.h> /* write(), close() */
39 /*****************************************************************************
40 * aout_sys_t: arts audio output method descriptor
41 *****************************************************************************
42 * This structure is part of the audio output thread descriptor.
43 * It describes some arts specific variables.
44 *****************************************************************************/
53 /*****************************************************************************
55 *****************************************************************************/
56 static int Open ( vlc_object_t * );
57 static void Close ( vlc_object_t * );
58 static void Play ( aout_instance_t * );
60 /*****************************************************************************
62 *****************************************************************************/
64 set_shortname( "aRts" );
65 set_description( _("aRts audio output") );
66 set_capability( "audio output", 50 );
67 set_category( CAT_AUDIO );
68 set_subcategory( SUBCAT_AUDIO_AOUT );
69 set_callbacks( Open, Close );
72 /*****************************************************************************
73 * Open: open an aRts socket
74 *****************************************************************************/
75 static int Open( vlc_object_t *p_this )
77 aout_instance_t *p_aout = (aout_instance_t *)p_this;
78 struct aout_sys_t * p_sys;
82 /* Allocate structure */
83 p_sys = malloc( sizeof( aout_sys_t ) );
86 msg_Err( p_aout, "out of memory" );
89 p_aout->output.p_sys = p_sys;
95 msg_Err( p_aout, "arts_init failed (%s)", arts_error_text(i_err) );
100 p_aout->output.pf_play = Play;
101 aout_VolumeSoftInit( p_aout );
103 p_aout->output.output.i_format = AOUT_FMT_S16_NE;
104 i_nb_channels = aout_FormatNbChannels( &p_aout->output.output );
105 if ( i_nb_channels > 2 )
107 /* aRts doesn't support more than two channels. */
109 p_aout->output.output.i_physical_channels =
110 AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT;
113 /* Open a socket for playing a stream, set format to 16 bits */
114 p_sys->stream = arts_play_stream( p_aout->output.output.i_rate, 16,
115 i_nb_channels, "vlc" );
116 if( p_sys->stream == NULL )
118 msg_Err( p_aout, "cannot open aRts socket" );
123 /* Try not to bufferize more than 200 ms */
124 arts_stream_set( p_sys->stream, ARTS_P_BUFFER_TIME, 50 );
126 /* Estimate latency with a half full buffer */
127 p_sys->latency = (mtime_t)1000
128 * (mtime_t)arts_stream_get( p_sys->stream, ARTS_P_SERVER_LATENCY );
129 p_sys->i_size = arts_stream_get( p_sys->stream, ARTS_P_PACKET_SIZE );
131 msg_Dbg( p_aout, "aRts initialized, latency %i000, %i packets of size %i",
132 arts_stream_get( p_sys->stream, ARTS_P_SERVER_LATENCY ),
133 arts_stream_get( p_sys->stream, ARTS_P_PACKET_COUNT ),
134 arts_stream_get( p_sys->stream, ARTS_P_PACKET_SIZE ) );
136 p_aout->output.i_nb_samples = p_sys->i_size / sizeof(uint16_t)
142 /*****************************************************************************
143 * Play: nothing to do
144 *****************************************************************************/
145 static void Play( aout_instance_t *p_aout )
147 struct aout_sys_t * p_sys = p_aout->output.p_sys;
148 aout_buffer_t * p_buffer;
152 while( arts_stream_get( p_sys->stream, ARTS_P_BUFFER_SPACE ) < 16384*3/2 )
158 p_buffer = aout_FifoPop( p_aout, &p_aout->output.fifo );
160 if( p_buffer != NULL )
162 i_tmp = arts_write( p_sys->stream, p_buffer->p_buffer,
163 p_buffer->i_nb_bytes );
167 msg_Err( p_aout, "write failed (%s)", arts_error_text(i_tmp) );
170 aout_BufferFree( p_buffer );
174 /*****************************************************************************
175 * Close: close the aRts socket
176 *****************************************************************************/
177 static void Close( vlc_object_t *p_this )
179 aout_instance_t *p_aout = (aout_instance_t *)p_this;
180 struct aout_sys_t * p_sys = p_aout->output.p_sys;
182 arts_close_stream( p_sys->stream );