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 );
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;
125 p_aout->output.i_nb_samples = ESD_BUF_SIZE * 2;
127 /* Open a socket for playing a stream
128 * and try to open /dev/dsp if there's no EsounD */
129 psz_server = config_GetPsz( p_aout, "esdserver" );
130 if( psz_server && *psz_server )
132 p_sys->i_fd = esd_play_stream_fallback( p_sys->esd_format,
133 p_aout->output.output.i_rate,
138 p_sys->i_fd = esd_play_stream_fallback( p_sys->esd_format,
139 p_aout->output.output.i_rate,
143 if( p_sys->i_fd < 0 )
145 msg_Err( p_aout, "cannot open esound socket (format 0x%08x at %d Hz)",
146 p_sys->esd_format, p_aout->output.output.i_rate );
151 if( psz_server && *psz_server )
153 struct timeval start, stop;
154 esd_server_info_t * p_info;
156 gettimeofday( &start, NULL );
157 p_info = esd_get_server_info( p_sys->i_fd );
158 gettimeofday( &stop, NULL );
160 p_sys->latency = (mtime_t)( stop.tv_sec - start.tv_sec )
162 p_sys->latency += stop.tv_usec - start.tv_usec;
169 /* ESD latency is calculated for 44100 Hz. We don't have any way to get the
170 * number of buffered samples, so I assume ESD_BUF_SIZE/2 */
172 (mtime_t)( esd_get_latency( i_newfd = esd_open_sound(NULL) )
174 * p_aout->output.output.i_bytes_per_frame
175 * p_aout->output.output.i_rate
178 / p_aout->output.output.i_bytes_per_frame
179 / p_aout->output.output.i_rate;
185 /*****************************************************************************
186 * Play: nothing to do
187 *****************************************************************************/
188 static void Play( aout_instance_t *p_aout )
190 struct aout_sys_t * p_sys = p_aout->output.p_sys;
191 aout_buffer_t * p_buffer;
194 p_buffer = aout_FifoPop( p_aout, &p_aout->output.fifo );
196 if ( p_buffer != NULL )
199 unsigned char *data = p_buffer->p_buffer;
201 for( pos = 0; pos + ESD_BUF_SIZE <= p_buffer->i_nb_bytes;
202 pos += ESD_BUF_SIZE )
204 i_tmp = write( p_sys->i_fd, data + pos, ESD_BUF_SIZE );
207 msg_Err( p_aout, "write failed (%s)", strerror(errno) );
210 aout_BufferFree( p_buffer );
214 /*****************************************************************************
215 * Close: close the Esound socket
216 *****************************************************************************/
217 static void Close( vlc_object_t *p_this )
219 aout_instance_t *p_aout = (aout_instance_t *)p_this;
220 struct aout_sys_t * p_sys = p_aout->output.p_sys;
222 close( p_sys->i_fd );
227 /*****************************************************************************
228 * Play: play a sound samples buffer
229 *****************************************************************************
230 * This function writes a buffer of i_length bytes in the socket
231 *****************************************************************************/
232 static void Play( aout_thread_t *p_aout, byte_t *buffer, int i_size )
236 int m1 = p_aout->output.p_sys->esd_format & ESD_STEREO ? 1 : 2;
237 int m2 = p_aout->output.p_sys->esd_format & ESD_BITS16 ? 64 : 128;
239 i_amount = (m1 * 44100 * (ESD_BUF_SIZE + m1 * m2)) / p_aout->i_rate;
241 write( p_aout->output.p_sys->i_fd, buffer, i_size );