1 /*****************************************************************************
2 * esd.c : EsounD module
3 *****************************************************************************
4 * Copyright (C) 2000, 2001 the VideoLAN team
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., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
22 *****************************************************************************/
24 /*****************************************************************************
26 *****************************************************************************/
27 #include <errno.h> /* ENOMEM */
28 #include <unistd.h> /* write(), close() */
33 #include <sys/socket.h>
40 /*****************************************************************************
41 * aout_sys_t: esd audio output method descriptor
42 *****************************************************************************
43 * This structure is part of the audio output thread descriptor.
44 * It describes some esd specific variables.
45 *****************************************************************************/
48 esd_format_t esd_format;
51 mtime_t latency; /* unused, but we might do something with it */
54 /*****************************************************************************
56 *****************************************************************************/
57 static int Open ( vlc_object_t * );
58 static void Close ( vlc_object_t * );
59 static void Play ( aout_instance_t * );
61 /*****************************************************************************
63 *****************************************************************************/
65 set_description( _("EsounD audio output") );
66 set_shortname( "EsounD" );
67 set_capability( "audio output", 50 );
68 add_string( "esdserver", "", NULL, N_("Esound server"), NULL, VLC_FALSE );
70 set_category( CAT_AUDIO );
71 set_subcategory( SUBCAT_AUDIO_AOUT );
72 set_callbacks( Open, Close );
73 add_shortcut( "esound" );
76 /*****************************************************************************
77 * Open: open an esd socket
78 *****************************************************************************/
79 static int Open( vlc_object_t *p_this )
81 aout_instance_t *p_aout = (aout_instance_t *)p_this;
82 struct aout_sys_t * p_sys;
87 /* Allocate structure */
88 p_sys = malloc( sizeof( aout_sys_t ) );
91 msg_Err( p_aout, "out of memory" );
95 p_aout->output.p_sys = p_sys;
97 p_aout->output.pf_play = Play;
98 aout_VolumeSoftInit( p_aout );
100 /* Initialize some variables */
101 p_sys->esd_format = ESD_BITS16 | ESD_STREAM | ESD_PLAY;
102 p_sys->esd_format &= ~ESD_MASK_CHAN;
104 p_aout->output.output.i_format = AOUT_FMT_S16_NE;
105 i_nb_channels = aout_FormatNbChannels( &p_aout->output.output );
106 if ( i_nb_channels > 2 )
108 /* EsounD doesn't support more than two channels. */
110 p_aout->output.output.i_physical_channels =
111 AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT;
114 switch( i_nb_channels )
117 p_sys->esd_format |= ESD_MONO;
120 p_sys->esd_format |= ESD_STEREO;
124 /* Force the rate, otherwise the sound is very noisy */
125 p_aout->output.output.i_rate = ESD_DEFAULT_RATE;
126 p_aout->output.i_nb_samples = ESD_BUF_SIZE * 2;
128 /* Open a socket for playing a stream
129 * and try to open /dev/dsp if there's no EsounD */
130 psz_server = config_GetPsz( p_aout, "esdserver" );
131 if( psz_server && *psz_server )
133 p_sys->i_fd = esd_play_stream_fallback( p_sys->esd_format,
134 p_aout->output.output.i_rate,
139 p_sys->i_fd = esd_play_stream_fallback( p_sys->esd_format,
140 p_aout->output.output.i_rate,
144 if( p_sys->i_fd < 0 )
146 msg_Err( p_aout, "cannot open esound socket (format 0x%08x at %d Hz)",
147 p_sys->esd_format, p_aout->output.output.i_rate );
152 if( psz_server && *psz_server )
154 struct timeval start, stop;
155 esd_server_info_t * p_info;
157 gettimeofday( &start, NULL );
158 p_info = esd_get_server_info( p_sys->i_fd );
159 gettimeofday( &stop, NULL );
161 p_sys->latency = (mtime_t)( stop.tv_sec - start.tv_sec )
163 p_sys->latency += stop.tv_usec - start.tv_usec;
170 /* ESD latency is calculated for 44100 Hz. We don't have any way to get the
171 * number of buffered samples, so I assume ESD_BUF_SIZE/2 */
173 (mtime_t)( esd_get_latency( i_newfd = esd_open_sound(NULL) )
175 * p_aout->output.output.i_bytes_per_frame
176 * p_aout->output.output.i_rate
179 / p_aout->output.output.i_bytes_per_frame
180 / p_aout->output.output.i_rate;
186 /*****************************************************************************
187 * Play: nothing to do
188 *****************************************************************************/
189 static void Play( aout_instance_t *p_aout )
191 struct aout_sys_t * p_sys = p_aout->output.p_sys;
192 aout_buffer_t * p_buffer;
195 p_buffer = aout_FifoPop( p_aout, &p_aout->output.fifo );
197 if ( p_buffer != NULL )
200 unsigned char *data = p_buffer->p_buffer;
202 for( pos = 0; pos + ESD_BUF_SIZE <= p_buffer->i_nb_bytes;
203 pos += ESD_BUF_SIZE )
205 i_tmp = write( p_sys->i_fd, data + pos, ESD_BUF_SIZE );
208 msg_Err( p_aout, "write failed (%m)" );
211 aout_BufferFree( p_buffer );
215 /*****************************************************************************
216 * Close: close the Esound socket
217 *****************************************************************************/
218 static void Close( vlc_object_t *p_this )
220 aout_instance_t *p_aout = (aout_instance_t *)p_this;
221 struct aout_sys_t * p_sys = p_aout->output.p_sys;
223 close( p_sys->i_fd );
228 /*****************************************************************************
229 * Play: play a sound samples buffer
230 *****************************************************************************
231 * This function writes a buffer of i_length bytes in the socket
232 *****************************************************************************/
233 static void Play( aout_thread_t *p_aout, byte_t *buffer, int i_size )
237 int m1 = p_aout->output.p_sys->esd_format & ESD_STEREO ? 1 : 2;
238 int m2 = p_aout->output.p_sys->esd_format & ESD_BITS16 ? 64 : 128;
240 i_amount = (m1 * 44100 * (ESD_BUF_SIZE + m1 * m2)) / p_aout->i_rate;
242 write( p_aout->output.p_sys->i_fd, buffer, i_size );