1 /*****************************************************************************
3 *****************************************************************************
4 * Copyright (C) 2001-2002 VideoLAN
6 * Authors: Emmanuel Blindauer <manu@agat.net>
7 * 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 *****************************************************************************/
27 #include <errno.h> /* ENOMEM */
28 #include <fcntl.h> /* open(), O_WRONLY */
29 #include <string.h> /* strerror() */
30 #include <unistd.h> /* write(), close() */
31 #include <stdlib.h> /* calloc(), malloc(), free() */
36 #include "aout_internal.h"
40 /*****************************************************************************
41 * aout_sys_t: arts audio output method descriptor
42 *****************************************************************************
43 * This structure is part of the audio output thread descriptor.
44 * It describes some arts specific variables.
45 *****************************************************************************/
49 vlc_bool_t b_initialized;
55 /*****************************************************************************
57 *****************************************************************************/
58 static int Open ( vlc_object_t * );
59 static void Close ( vlc_object_t * );
61 static int SetFormat ( aout_instance_t * );
62 static void Play ( aout_instance_t * );
63 static int aRtsThread ( aout_instance_t * );
65 /*****************************************************************************
67 *****************************************************************************/
69 set_description( _("aRts audio module") );
70 set_capability( "audio output", 50 );
71 set_callbacks( Open, Close );
74 /*****************************************************************************
75 * Open: open an aRts socket
76 *****************************************************************************/
77 static int Open( vlc_object_t *p_this )
79 aout_instance_t *p_aout = (aout_instance_t *)p_this;
80 struct aout_sys_t * p_sys;
83 /* Allocate structure */
84 p_sys = malloc( sizeof( aout_sys_t ) );
87 msg_Err( p_aout, "out of memory" );
95 msg_Err( p_aout, "arts_init failed (%s)", arts_error_text(i_err) );
100 p_aout->output.p_sys = p_sys;
102 /* Create aRts thread and wait for its readiness. */
103 p_sys->b_initialized = VLC_FALSE;
104 if( vlc_thread_create( p_aout, "aout", aRtsThread, VLC_FALSE ) )
106 msg_Err( p_aout, "cannot create aRts thread (%s)", strerror(errno) );
111 p_aout->output.pf_setformat = SetFormat;
112 p_aout->output.pf_play = Play;
114 p_sys->stream = NULL;
119 /*****************************************************************************
120 * SetFormat: set the output format
121 *****************************************************************************/
122 static int SetFormat( aout_instance_t *p_aout )
124 struct aout_sys_t * p_sys = p_aout->output.p_sys;
126 p_sys->b_initialized = VLC_FALSE;
130 arts_close_stream( p_sys->stream );
133 /* open a socket for playing a stream */
134 p_sys->stream = arts_play_stream( p_aout->output.output.i_rate, 16,
135 p_aout->output.output.i_channels, "vlc" );
136 if( p_sys->stream == NULL )
138 msg_Err( p_aout, "cannot open aRts socket" );
142 /* Try not to bufferize more than 200 ms */
143 arts_stream_set( p_sys->stream, ARTS_P_BUFFER_TIME, 200 );
145 /* Estimate latency with a half full buffer */
146 p_sys->latency = (mtime_t)1000
147 * (mtime_t)( arts_stream_get( p_sys->stream, ARTS_P_SERVER_LATENCY )
148 + arts_stream_get( p_sys->stream, ARTS_P_BUFFER_TIME ) / 2 );
149 p_sys->i_size = arts_stream_get( p_sys->stream, ARTS_P_PACKET_SIZE );
151 p_aout->output.output.i_format = AOUT_FMT_S16_NE;
152 p_aout->output.i_nb_samples = p_sys->i_size;
154 p_sys->b_initialized = VLC_TRUE;
159 /*****************************************************************************
160 * Play: queue a buffer for playing by aRtsThread
161 *****************************************************************************/
162 static void Play( aout_instance_t *p_aout )
167 /*****************************************************************************
168 * Close: close the aRts socket
169 *****************************************************************************/
170 static void Close( vlc_object_t *p_this )
172 aout_instance_t *p_aout = (aout_instance_t *)p_this;
173 struct aout_sys_t * p_sys = p_aout->output.p_sys;
176 vlc_thread_join( p_aout );
180 arts_close_stream( p_sys->stream );
187 /*****************************************************************************
188 * aRtsThread: asynchronous thread used to DMA the data to the device
189 *****************************************************************************/
190 static int aRtsThread( aout_instance_t * p_aout )
192 struct aout_sys_t * p_sys = p_aout->output.p_sys;
194 while ( !p_aout->b_die )
196 aout_buffer_t * p_buffer;
200 if( !p_sys->b_initialized )
202 msleep( THREAD_SLEEP );
206 /* Get the presentation date of the next write() operation. It
207 * is equal to the current date + latency */
208 p_buffer = aout_OutputNextBuffer( p_aout, mdate() + p_sys->latency,
211 if ( p_buffer != NULL )
213 p_bytes = p_buffer->p_buffer;
214 i_size = p_buffer->i_nb_bytes;
218 i_size = p_sys->i_size / p_aout->output.output.i_frame_length
219 * p_aout->output.output.i_bytes_per_frame;
220 p_bytes = alloca( i_size );
221 memset( p_bytes, 0, i_size );
224 i_tmp = arts_write( p_sys->stream, p_bytes, i_size );
228 msg_Err( p_aout, "write failed (%s)", arts_error_text(i_tmp) );
231 if ( p_buffer != NULL )
233 aout_BufferFree( p_buffer );