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() */
35 /*****************************************************************************
36 * aout_sys_t: arts audio output method descriptor
37 *****************************************************************************
38 * This structure is part of the audio output thread descriptor.
39 * It describes some arts specific variables.
40 *****************************************************************************/
49 /*****************************************************************************
51 *****************************************************************************/
52 static int Open ( vlc_object_t * );
53 static void Close ( vlc_object_t * );
54 static void Play ( aout_instance_t * );
56 /*****************************************************************************
58 *****************************************************************************/
60 set_shortname( "aRts" );
61 set_description( _("aRts audio output") );
62 set_capability( "audio output", 50 );
63 set_category( CAT_AUDIO );
64 set_subcategory( SUBCAT_AUDIO_AOUT );
65 set_callbacks( Open, Close );
68 /*****************************************************************************
69 * Open: open an aRts socket
70 *****************************************************************************/
71 static int Open( vlc_object_t *p_this )
73 aout_instance_t *p_aout = (aout_instance_t *)p_this;
74 struct aout_sys_t * p_sys;
78 /* Allocate structure */
79 p_sys = malloc( sizeof( aout_sys_t ) );
82 msg_Err( p_aout, "out of memory" );
85 p_aout->output.p_sys = p_sys;
91 msg_Err( p_aout, "arts_init failed (%s)", arts_error_text(i_err) );
96 p_aout->output.pf_play = Play;
97 aout_VolumeSoftInit( p_aout );
99 p_aout->output.output.i_format = AOUT_FMT_S16_NE;
100 i_nb_channels = aout_FormatNbChannels( &p_aout->output.output );
101 if ( i_nb_channels > 2 )
103 /* aRts doesn't support more than two channels. */
105 p_aout->output.output.i_physical_channels =
106 AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT;
109 /* Open a socket for playing a stream, set format to 16 bits */
110 p_sys->stream = arts_play_stream( p_aout->output.output.i_rate, 16,
111 i_nb_channels, "vlc" );
112 if( p_sys->stream == NULL )
114 msg_Err( p_aout, "cannot open aRts socket" );
119 /* Try not to bufferize more than 200 ms */
120 arts_stream_set( p_sys->stream, ARTS_P_BUFFER_TIME, 50 );
122 /* Estimate latency with a half full buffer */
123 p_sys->latency = (mtime_t)1000
124 * (mtime_t)arts_stream_get( p_sys->stream, ARTS_P_SERVER_LATENCY );
125 p_sys->i_size = arts_stream_get( p_sys->stream, ARTS_P_PACKET_SIZE );
127 msg_Dbg( p_aout, "aRts initialized, latency %i000, %i packets of size %i",
128 arts_stream_get( p_sys->stream, ARTS_P_SERVER_LATENCY ),
129 arts_stream_get( p_sys->stream, ARTS_P_PACKET_COUNT ),
130 arts_stream_get( p_sys->stream, ARTS_P_PACKET_SIZE ) );
132 p_aout->output.i_nb_samples = p_sys->i_size / sizeof(uint16_t)
138 /*****************************************************************************
139 * Play: nothing to do
140 *****************************************************************************/
141 static void Play( aout_instance_t *p_aout )
143 struct aout_sys_t * p_sys = p_aout->output.p_sys;
144 aout_buffer_t * p_buffer;
148 while( arts_stream_get( p_sys->stream, ARTS_P_BUFFER_SPACE ) < 16384*3/2 )
154 p_buffer = aout_FifoPop( p_aout, &p_aout->output.fifo );
156 if( p_buffer != NULL )
158 i_tmp = arts_write( p_sys->stream, p_buffer->p_buffer,
159 p_buffer->i_nb_bytes );
163 msg_Err( p_aout, "write failed (%s)", arts_error_text(i_tmp) );
166 aout_BufferFree( p_buffer );
170 /*****************************************************************************
171 * Close: close the aRts socket
172 *****************************************************************************/
173 static void Close( vlc_object_t *p_this )
175 aout_instance_t *p_aout = (aout_instance_t *)p_this;
176 struct aout_sys_t * p_sys = p_aout->output.p_sys;
178 arts_close_stream( p_sys->stream );