1 /*****************************************************************************
3 *****************************************************************************
4 * Copyright (C) 2001-2002 VideoLAN
5 * $Id: arts.c,v 1.15 2002/11/08 10:26:53 gbazin 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;
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_channels = AOUT_CHAN_STEREO;
112 /* Open a socket for playing a stream, set format to 16 bits */
113 p_sys->stream = arts_play_stream( p_aout->output.output.i_rate, 16,
114 i_nb_channels, "vlc" );
115 if( p_sys->stream == NULL )
117 msg_Err( p_aout, "cannot open aRts socket" );
122 /* Try not to bufferize more than 200 ms */
123 arts_stream_set( p_sys->stream, ARTS_P_BUFFER_TIME, 50 );
125 /* Estimate latency with a half full buffer */
126 p_sys->latency = (mtime_t)1000
127 * (mtime_t)arts_stream_get( p_sys->stream, ARTS_P_SERVER_LATENCY );
128 p_sys->i_size = arts_stream_get( p_sys->stream, ARTS_P_PACKET_SIZE );
130 msg_Dbg( p_aout, "aRts initialized, latency %i000, %i packets of size %i",
131 arts_stream_get( p_sys->stream, ARTS_P_SERVER_LATENCY ),
132 arts_stream_get( p_sys->stream, ARTS_P_PACKET_COUNT ),
133 arts_stream_get( p_sys->stream, ARTS_P_PACKET_SIZE ) );
135 p_aout->output.i_nb_samples = p_sys->i_size / sizeof(u16) / i_nb_channels;
137 /* Create aRts thread and wait for its readiness. */
138 if( vlc_thread_create( p_aout, "aout", aRtsThread,
139 VLC_THREAD_PRIORITY_OUTPUT, VLC_FALSE ) )
141 msg_Err( p_aout, "cannot create aRts thread (%s)", strerror(errno) );
142 arts_close_stream( p_sys->stream );
151 /*****************************************************************************
152 * Play: nothing to do
153 *****************************************************************************/
154 static void Play( aout_instance_t *p_aout )
159 /*****************************************************************************
160 * Close: close the aRts socket
161 *****************************************************************************/
162 static void Close( vlc_object_t *p_this )
164 aout_instance_t *p_aout = (aout_instance_t *)p_this;
165 struct aout_sys_t * p_sys = p_aout->output.p_sys;
168 vlc_thread_join( p_aout );
170 arts_close_stream( p_sys->stream );
175 /*****************************************************************************
176 * aRtsThread: asynchronous thread used to DMA the data to the device
177 *****************************************************************************/
178 static int aRtsThread( aout_instance_t * p_aout )
180 struct aout_sys_t * p_sys = p_aout->output.p_sys;
181 mtime_t calldate = mdate();
183 while ( !p_aout->b_die )
185 aout_buffer_t * p_buffer;
189 fprintf(stderr, "can write %i\n", arts_stream_get( p_sys->stream, ARTS_P_BUFFER_SPACE ) );
190 while( arts_stream_get( p_sys->stream, ARTS_P_BUFFER_SPACE ) < 16384*3/2 )
192 fprintf(stderr, "sleep\n");
195 fprintf(stderr, "after sleep: can write %i\n", arts_stream_get( p_sys->stream, ARTS_P_BUFFER_SPACE ) );
197 /* Get the presentation date of the next write() operation. It
198 * is equal to the current date + latency */
199 p_buffer = aout_OutputNextBuffer( p_aout, mdate() + p_sys->latency / 4,
202 if ( p_buffer != NULL )
204 fprintf(stderr, "buffer duration "I64Fd", bytes %i\n", p_buffer->end_date - p_buffer->start_date, p_buffer->i_nb_bytes);
205 p_bytes = p_buffer->p_buffer;
206 i_size = p_buffer->i_nb_bytes;
210 i_size = p_sys->i_size;
211 p_bytes = malloc( i_size );
212 memset( p_bytes, 0, i_size );
215 fprintf(stderr, "WRITING %i bytes\n", i_size);
216 i_tmp = arts_write( p_sys->stream, p_bytes, i_size );
217 fprintf(stderr, "mdate: "I64Fd"\n", mdate() - calldate);
219 fprintf(stderr, "can write %i\n", arts_stream_get( p_sys->stream, ARTS_P_BUFFER_SPACE ) );
223 msg_Err( p_aout, "write failed (%s)", arts_error_text(i_tmp) );
226 if ( p_buffer != NULL )
228 aout_BufferFree( p_buffer );