1 /*****************************************************************************
2 * esd.c : EsounD module
3 *****************************************************************************
4 * Copyright (C) 2000, 2001 VideoLAN
5 * $Id: esd.c,v 1.8 2002/08/19 23:07:30 sam Exp $
7 * Authors: 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() */
35 #include "aout_internal.h"
39 /*****************************************************************************
40 * aout_sys_t: esd audio output method descriptor
41 *****************************************************************************
42 * This structure is part of the audio output thread descriptor.
43 * It describes some esd specific variables.
44 *****************************************************************************/
47 esd_format_t esd_format;
49 vlc_bool_t b_initialized;
54 /*****************************************************************************
56 *****************************************************************************/
57 static int Open ( vlc_object_t * );
58 static void Close ( vlc_object_t * );
60 static int SetFormat ( aout_instance_t * );
61 static void Play ( aout_instance_t * );
62 static int ESDThread ( aout_instance_t * );
64 /*****************************************************************************
66 *****************************************************************************/
68 set_description( _("EsounD audio module") );
69 set_capability( "audio output", 50 );
70 set_callbacks( Open, Close );
71 add_shortcut( "esound" );
74 /*****************************************************************************
75 * Open: open an esd 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;
82 /* Allocate structure */
83 p_sys = malloc( sizeof( aout_sys_t ) );
86 msg_Err( p_aout, "out of memory" );
90 p_aout->output.p_sys = p_sys;
92 /* Create ESD thread and wait for its readiness. */
93 p_sys->b_initialized = VLC_FALSE;
94 if( vlc_thread_create( p_aout, "aout", ESDThread, VLC_FALSE ) )
96 msg_Err( p_aout, "cannot create ESD thread (%s)", strerror(errno) );
101 p_aout->output.pf_setformat = SetFormat;
102 p_aout->output.pf_play = Play;
107 /*****************************************************************************
108 * SetFormat: set the output format
109 *****************************************************************************/
110 static int SetFormat( aout_instance_t *p_aout )
112 struct aout_sys_t * p_sys = p_aout->output.p_sys;
114 p_sys->b_initialized = VLC_FALSE;
116 /* Initialize some variables */
117 p_sys->esd_format = ESD_BITS16 | ESD_STREAM | ESD_PLAY;
118 p_sys->esd_format &= ~ESD_MASK_CHAN;
120 switch( p_aout->output.output.i_channels )
123 p_sys->esd_format |= ESD_MONO;
126 p_sys->esd_format |= ESD_STEREO;
132 /* open a socket for playing a stream
133 * and try to open /dev/dsp if there's no EsounD */
134 p_sys->i_fd = esd_play_stream_fallback( p_sys->esd_format,
135 p_aout->output.output.i_rate, NULL, "vlc" );
136 if( p_sys->i_fd < 0 )
138 msg_Err( p_aout, "cannot open esound socket (format 0x%08x at %ld Hz)",
139 p_sys->esd_format, p_aout->output.output.i_rate );
143 p_aout->output.output.i_format = AOUT_FMT_S16_NE;
144 p_aout->output.i_nb_samples = ESD_BUF_SIZE * 2;
146 /* ESD latency is calculated for 44100 Hz. We don't have any way to get the
147 * number of buffered samples, so I assume ESD_BUF_SIZE/2 */
149 (mtime_t)( esd_get_latency( esd_open_sound(NULL) ) + ESD_BUF_SIZE/2
150 * p_aout->output.output.i_bytes_per_frame
151 * p_aout->output.output.i_rate
152 / p_aout->output.output.i_frame_length
155 / p_aout->output.output.i_bytes_per_frame
156 / p_aout->output.output.i_rate
157 * p_aout->output.output.i_frame_length;
159 p_sys->b_initialized = VLC_TRUE;
164 /*****************************************************************************
165 * Play: queue a buffer for playing by ESDThread
166 *****************************************************************************/
167 static void Play( aout_instance_t *p_aout )
171 /*****************************************************************************
172 * Close: close the Esound socket
173 *****************************************************************************/
174 static void Close( vlc_object_t *p_this )
176 aout_instance_t *p_aout = (aout_instance_t *)p_this;
177 struct aout_sys_t * p_sys = p_aout->output.p_sys;
180 vlc_thread_join( p_aout );
182 close( p_sys->i_fd );
186 /*****************************************************************************
187 * ESDThread: asynchronous thread used to DMA the data to the device
188 *****************************************************************************/
189 static int ESDThread( aout_instance_t * p_aout )
191 struct aout_sys_t * p_sys = p_aout->output.p_sys;
193 while ( !p_aout->b_die )
195 aout_buffer_t * p_buffer;
199 if( !p_sys->b_initialized )
201 msleep( THREAD_SLEEP );
205 /* Get the presentation date of the next write() operation. It
206 * is equal to the current date + buffered samples + esd latency */
207 p_buffer = aout_OutputNextBuffer( p_aout, mdate() + p_sys->latency, 0 );
209 if ( p_buffer != NULL )
211 p_bytes = p_buffer->p_buffer;
212 i_size = p_buffer->i_nb_bytes;
216 i_size = ESD_BUF_SIZE * 2
217 / p_aout->output.output.i_frame_length
218 * p_aout->output.output.i_bytes_per_frame;
219 p_bytes = alloca( i_size );
220 memset( p_bytes, 0, i_size );
223 i_tmp = write( p_sys->i_fd, p_bytes, i_size );
227 msg_Err( p_aout, "write failed (%s)", strerror(errno) );
230 if ( p_buffer != NULL )
232 aout_BufferFree( p_buffer );
240 /*****************************************************************************
241 * Play: play a sound samples buffer
242 *****************************************************************************
243 * This function writes a buffer of i_length bytes in the socket
244 *****************************************************************************/
245 static void Play( aout_thread_t *p_aout, byte_t *buffer, int i_size )
249 int m1 = p_aout->output.p_sys->esd_format & ESD_STEREO ? 1 : 2;
250 int m2 = p_aout->output.p_sys->esd_format & ESD_BITS16 ? 64 : 128;
252 i_amount = (m1 * 44100 * (ESD_BUF_SIZE + m1 * m2)) / p_aout->i_rate;
254 write( p_aout->output.p_sys->i_fd, buffer, i_size );