1 /*****************************************************************************
3 *****************************************************************************
4 * Copyright (C) 2001-2002 VideoLAN
5 * $Id: arts.c,v 1.10 2002/08/30 23:27:06 massiot Exp $
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., 59 Temple Place - Suite 330, Boston, MA 02111, USA.
23 *****************************************************************************/
25 /*****************************************************************************
27 *****************************************************************************/
28 #include <errno.h> /* ENOMEM */
29 #include <fcntl.h> /* open(), O_WRONLY */
30 #include <string.h> /* strerror() */
31 #include <unistd.h> /* write(), close() */
32 #include <stdlib.h> /* calloc(), malloc(), free() */
37 #include "aout_internal.h"
41 /*****************************************************************************
42 * aout_sys_t: arts audio output method descriptor
43 *****************************************************************************
44 * This structure is part of the audio output thread descriptor.
45 * It describes some arts specific variables.
46 *****************************************************************************/
55 /*****************************************************************************
57 *****************************************************************************/
58 static int Open ( vlc_object_t * );
59 static void Close ( vlc_object_t * );
60 static void Play ( aout_instance_t * );
61 static int aRtsThread ( aout_instance_t * );
63 /*****************************************************************************
65 *****************************************************************************/
67 set_description( _("aRts audio module") );
68 set_capability( "audio output", 50 );
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;
81 /* Allocate structure */
82 p_sys = malloc( sizeof( aout_sys_t ) );
85 msg_Err( p_aout, "out of memory" );
88 p_aout->output.p_sys = p_sys;
94 msg_Err( p_aout, "arts_init failed (%s)", arts_error_text(i_err) );
99 p_aout->output.pf_play = Play;
101 p_sys->stream = NULL;
105 arts_close_stream( p_sys->stream );
108 /* open a socket for playing a stream */
109 p_sys->stream = arts_play_stream( p_aout->output.output.i_rate, 16,
110 p_aout->output.output.i_channels, "vlc" );
111 if( p_sys->stream == NULL )
113 msg_Err( p_aout, "cannot open aRts socket" );
117 /* Try not to bufferize more than 200 ms */
118 arts_stream_set( p_sys->stream, ARTS_P_BUFFER_TIME, 200 );
120 /* Estimate latency with a half full buffer */
121 p_sys->latency = (mtime_t)1000
122 * (mtime_t)( arts_stream_get( p_sys->stream, ARTS_P_SERVER_LATENCY )
123 + arts_stream_get( p_sys->stream, ARTS_P_BUFFER_TIME ) / 2 );
124 p_sys->i_size = arts_stream_get( p_sys->stream, ARTS_P_PACKET_SIZE );
126 p_aout->output.output.i_format = AOUT_FMT_S16_NE;
127 p_aout->output.i_nb_samples = p_sys->i_size;
129 /* Create aRts thread and wait for its readiness. */
130 if( vlc_thread_create( p_aout, "aout", aRtsThread,
131 VLC_THREAD_PRIORITY_OUTPUT, VLC_FALSE ) )
133 msg_Err( p_aout, "cannot create aRts thread (%s)", strerror(errno) );
141 /*****************************************************************************
142 * Play: nothing to do
143 *****************************************************************************/
144 static void Play( aout_instance_t *p_aout )
149 /*****************************************************************************
150 * Close: close the aRts socket
151 *****************************************************************************/
152 static void Close( vlc_object_t *p_this )
154 aout_instance_t *p_aout = (aout_instance_t *)p_this;
155 struct aout_sys_t * p_sys = p_aout->output.p_sys;
158 vlc_thread_join( p_aout );
162 arts_close_stream( p_sys->stream );
169 /*****************************************************************************
170 * aRtsThread: asynchronous thread used to DMA the data to the device
171 *****************************************************************************/
172 static int aRtsThread( aout_instance_t * p_aout )
174 struct aout_sys_t * p_sys = p_aout->output.p_sys;
176 while ( !p_aout->b_die )
178 aout_buffer_t * p_buffer;
182 /* Get the presentation date of the next write() operation. It
183 * is equal to the current date + latency */
184 p_buffer = aout_OutputNextBuffer( p_aout, mdate() + p_sys->latency,
187 if ( p_buffer != NULL )
189 p_bytes = p_buffer->p_buffer;
190 i_size = p_buffer->i_nb_bytes;
194 i_size = p_sys->i_size / p_aout->output.output.i_frame_length
195 * p_aout->output.output.i_bytes_per_frame;
196 p_bytes = alloca( i_size );
197 memset( p_bytes, 0, i_size );
200 i_tmp = arts_write( p_sys->stream, p_bytes, i_size );
204 msg_Err( p_aout, "write failed (%s)", arts_error_text(i_tmp) );
207 if ( p_buffer != NULL )
209 aout_BufferFree( p_buffer );