1 /*****************************************************************************
2 * esd.c : EsounD module
3 *****************************************************************************
4 * Copyright (C) 2000, 2001 VideoLAN
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"
37 #include <sys/socket.h>
41 /*****************************************************************************
42 * aout_sys_t: esd audio output method descriptor
43 *****************************************************************************
44 * This structure is part of the audio output thread descriptor.
45 * It describes some esd specific variables.
46 *****************************************************************************/
49 esd_format_t esd_format;
52 mtime_t latency; /* unused, but we might do something with it */
55 /*****************************************************************************
57 *****************************************************************************/
58 static int Open ( vlc_object_t * );
59 static void Close ( vlc_object_t * );
60 static void Play ( aout_instance_t * );
62 /*****************************************************************************
64 *****************************************************************************/
66 set_description( _("EsounD audio output") );
67 set_shortname( "EsounD" );
68 set_capability( "audio output", 50 );
69 set_category( CAT_AUDIO );
70 set_subcategory( SUBCAT_AUDIO_AOUT );
71 set_callbacks( Open, Close );
72 add_shortcut( "esound" );
75 /*****************************************************************************
76 * Open: open an esd socket
77 *****************************************************************************/
78 static int Open( vlc_object_t *p_this )
80 aout_instance_t *p_aout = (aout_instance_t *)p_this;
81 struct aout_sys_t * p_sys;
86 /* Allocate structure */
87 p_sys = malloc( sizeof( aout_sys_t ) );
90 msg_Err( p_aout, "out of memory" );
94 p_aout->output.p_sys = p_sys;
96 p_aout->output.pf_play = Play;
97 aout_VolumeSoftInit( p_aout );
99 /* Initialize some variables */
100 p_sys->esd_format = ESD_BITS16 | ESD_STREAM | ESD_PLAY;
101 p_sys->esd_format &= ~ESD_MASK_CHAN;
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 /* EsounD doesn't support more than two channels. */
109 p_aout->output.output.i_physical_channels =
110 AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT;
113 switch( i_nb_channels )
116 p_sys->esd_format |= ESD_MONO;
119 p_sys->esd_format |= ESD_STEREO;
123 /* Force the rate, otherwise the sound is very noisy */
124 p_aout->output.output.i_rate = ESD_DEFAULT_RATE;
126 /* open a socket for playing a stream
127 * and try to open /dev/dsp if there's no EsounD */
128 p_sys->i_fd = esd_play_stream_fallback( p_sys->esd_format,
129 p_aout->output.output.i_rate, NULL, "vlc" );
130 if( p_sys->i_fd < 0 )
132 msg_Err( p_aout, "cannot open esound socket (format 0x%08x at %d Hz)",
133 p_sys->esd_format, p_aout->output.output.i_rate );
138 p_aout->output.i_nb_samples = ESD_BUF_SIZE * 2;
140 /* ESD latency is calculated for 44100 Hz. We don't have any way to get the
141 * number of buffered samples, so I assume ESD_BUF_SIZE/2 */
143 (mtime_t)( esd_get_latency( i_newfd = esd_open_sound(NULL) ) +
145 * p_aout->output.output.i_bytes_per_frame
146 * p_aout->output.output.i_rate
149 / p_aout->output.output.i_bytes_per_frame
150 / p_aout->output.output.i_rate;
156 /*****************************************************************************
157 * Play: nothing to do
158 *****************************************************************************/
159 static void Play( aout_instance_t *p_aout )
161 struct aout_sys_t * p_sys = p_aout->output.p_sys;
162 aout_buffer_t * p_buffer;
165 p_buffer = aout_FifoPop( p_aout, &p_aout->output.fifo );
167 if ( p_buffer != NULL )
170 char *data = p_buffer->p_buffer;
172 for( pos = 0; pos + ESD_BUF_SIZE <= p_buffer->i_nb_bytes;
173 pos += ESD_BUF_SIZE )
175 i_tmp = write( p_sys->i_fd, data + pos, ESD_BUF_SIZE );
178 msg_Err( p_aout, "write failed (%s)", strerror(errno) );
181 aout_BufferFree( p_buffer );
185 /*****************************************************************************
186 * Close: close the Esound socket
187 *****************************************************************************/
188 static void Close( vlc_object_t *p_this )
190 aout_instance_t *p_aout = (aout_instance_t *)p_this;
191 struct aout_sys_t * p_sys = p_aout->output.p_sys;
193 close( p_sys->i_fd );
198 /*****************************************************************************
199 * Play: play a sound samples buffer
200 *****************************************************************************
201 * This function writes a buffer of i_length bytes in the socket
202 *****************************************************************************/
203 static void Play( aout_thread_t *p_aout, byte_t *buffer, int i_size )
207 int m1 = p_aout->output.p_sys->esd_format & ESD_STEREO ? 1 : 2;
208 int m2 = p_aout->output.p_sys->esd_format & ESD_BITS16 ? 64 : 128;
210 i_amount = (m1 * 44100 * (ESD_BUF_SIZE + m1 * m2)) / p_aout->i_rate;
212 write( p_aout->output.p_sys->i_fd, buffer, i_size );