1 /*****************************************************************************
2 * jack.c : JACK audio output module
3 *****************************************************************************
4 * Copyright (C) 2006 the VideoLAN team
7 * Authors: Cyril Deguet <asmax _at_ videolan.org>
8 * Jon Griffiths <jon_p_griffiths _At_ yahoo _DOT_ com>
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., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
23 *****************************************************************************/
25 * \file modules/audio_output/jack.c
26 * \brief JACK audio output functions
28 /*****************************************************************************
30 *****************************************************************************/
31 #include <unistd.h> /* write(), close() */
37 #include <vlc_common.h>
38 #include <vlc_plugin.h>
41 #include <jack/jack.h>
43 typedef jack_default_audio_sample_t jack_sample_t;
45 /*****************************************************************************
46 * aout_sys_t: JACK audio output method descriptor
47 *****************************************************************************
48 * This structure is part of the audio output thread descriptor.
49 * It describes some JACK specific variables.
50 *****************************************************************************/
54 jack_client_t *p_jack_client;
55 jack_port_t **p_jack_ports;
56 jack_sample_t **p_jack_buffers;
57 unsigned int i_channels;
58 jack_nframes_t latency;
63 /*****************************************************************************
65 *****************************************************************************/
66 static int Open ( vlc_object_t * );
67 static void Close ( vlc_object_t * );
68 static int Process ( jack_nframes_t i_frames, void *p_arg );
69 static int GraphChange ( void *p_arg );
73 #define AUTO_CONNECT_OPTION "jack-auto-connect"
74 #define AUTO_CONNECT_TEXT N_("Automatically connect to writable clients")
75 #define AUTO_CONNECT_LONGTEXT N_( \
76 "If enabled, this option will automatically connect sound output to the " \
77 "first writable JACK clients found." )
79 #define CONNECT_REGEX_OPTION "jack-connect-regex"
80 #define CONNECT_REGEX_TEXT N_("Connect to clients matching")
81 #define CONNECT_REGEX_LONGTEXT N_( \
82 "If automatic connection is enabled, only JACK clients whose names " \
83 "match this regular expression will be considered for connection." )
85 /*****************************************************************************
87 *****************************************************************************/
89 set_shortname( "JACK" )
90 set_description( N_("JACK audio output") )
91 set_capability( "audio output", 100 )
92 set_category( CAT_AUDIO )
93 set_subcategory( SUBCAT_AUDIO_AOUT )
94 add_bool( AUTO_CONNECT_OPTION, true, AUTO_CONNECT_TEXT,
95 AUTO_CONNECT_LONGTEXT, false )
96 add_string( CONNECT_REGEX_OPTION, "system", CONNECT_REGEX_TEXT,
97 CONNECT_REGEX_LONGTEXT, false )
99 set_callbacks( Open, Close )
103 static int Start( audio_output_t *p_aout, audio_sample_format_t *restrict fmt )
106 struct aout_sys_t *p_sys = p_aout->sys;
107 int status = VLC_SUCCESS;
113 /* Connect to the JACK server */
114 snprintf( psz_name, sizeof(psz_name), "vlc_%d", getpid());
115 psz_name[sizeof(psz_name) - 1] = '\0';
116 p_sys->p_jack_client = jack_client_open( psz_name,
117 JackNullOption | JackNoStartServer,
119 if( p_sys->p_jack_client == NULL )
121 msg_Err( p_aout, "failed to connect to JACK server" );
122 status = VLC_EGENERIC;
126 /* Set the process callback */
127 jack_set_process_callback( p_sys->p_jack_client, Process, p_aout );
128 jack_set_graph_order_callback ( p_sys->p_jack_client, GraphChange, p_aout );
130 /* JACK only supports fl32 format */
131 fmt->i_format = VLC_CODEC_FL32;
132 // TODO add buffer size callback
133 fmt->i_rate = jack_get_sample_rate( p_sys->p_jack_client );
135 p_aout->play = aout_PacketPlay;
136 p_aout->pause = aout_PacketPause;
137 p_aout->flush = aout_PacketFlush;
138 aout_PacketInit( p_aout, &p_sys->packet,
139 jack_get_buffer_size( p_sys->p_jack_client ), fmt );
140 aout_SoftVolumeStart( p_aout );
142 p_sys->i_channels = aout_FormatNbChannels( fmt );
144 p_sys->p_jack_ports = malloc( p_sys->i_channels *
145 sizeof(jack_port_t *) );
146 if( p_sys->p_jack_ports == NULL )
152 p_sys->p_jack_buffers = malloc( p_sys->i_channels *
153 sizeof(jack_sample_t *) );
154 if( p_sys->p_jack_buffers == NULL )
160 /* Create the output ports */
161 for( i = 0; i < p_sys->i_channels; i++ )
163 snprintf( psz_name, sizeof(psz_name), "out_%d", i + 1);
164 psz_name[sizeof(psz_name) - 1] = '\0';
165 p_sys->p_jack_ports[i] = jack_port_register( p_sys->p_jack_client,
166 psz_name, JACK_DEFAULT_AUDIO_TYPE, JackPortIsOutput, 0 );
168 if( p_sys->p_jack_ports[i] == NULL )
170 msg_Err( p_aout, "failed to register a JACK port" );
171 status = VLC_EGENERIC;
176 /* Tell the JACK server we are ready */
177 i_error = jack_activate( p_sys->p_jack_client );
180 msg_Err( p_aout, "failed to activate JACK client (error %d)", i_error );
181 status = VLC_EGENERIC;
185 /* Auto connect ports if we were asked to */
186 if( var_InheritBool( p_aout, AUTO_CONNECT_OPTION ) )
188 unsigned int i_in_ports;
189 char *psz_regex = var_InheritString( p_aout, CONNECT_REGEX_OPTION );
190 const char **pp_in_ports = jack_get_ports( p_sys->p_jack_client,
194 /* Count the number of returned ports */
196 while( pp_in_ports && pp_in_ports[i_in_ports] )
201 /* Tie the output ports to JACK input ports */
202 for( i = 0; i_in_ports > 0 && i < p_sys->i_channels; i++ )
204 const char* psz_in = pp_in_ports[i % i_in_ports];
205 const char* psz_out = jack_port_name( p_sys->p_jack_ports[i] );
207 i_error = jack_connect( p_sys->p_jack_client, psz_out, psz_in );
210 msg_Err( p_aout, "failed to connect port %s to port %s (error %d)",
211 psz_out, psz_in, i_error );
215 msg_Dbg( p_aout, "connecting port %s to port %s",
222 msg_Dbg( p_aout, "JACK audio output initialized (%d channels, rate=%d)",
223 p_sys->i_channels, fmt->i_rate );
226 /* Clean up, if an error occurred */
227 if( status != VLC_SUCCESS && p_sys != NULL)
229 if( p_sys->p_jack_client )
231 jack_deactivate( p_sys->p_jack_client );
232 jack_client_close( p_sys->p_jack_client );
233 aout_PacketDestroy( p_aout );
235 free( p_sys->p_jack_ports );
236 free( p_sys->p_jack_buffers );
242 /*****************************************************************************
243 * Process: callback for JACK
244 *****************************************************************************/
245 int Process( jack_nframes_t i_frames, void *p_arg )
247 unsigned int i, j, i_nb_samples = 0;
248 audio_output_t *p_aout = (audio_output_t*) p_arg;
249 struct aout_sys_t *p_sys = p_aout->sys;
250 jack_sample_t *p_src = NULL;
252 jack_nframes_t dframes = p_sys->latency
253 - jack_frames_since_cycle_start( p_sys->p_jack_client );
255 jack_time_t dtime = dframes * 1000 * 1000 / jack_get_sample_rate( p_sys->p_jack_client );
256 mtime_t play_date = mdate() + (mtime_t) ( dtime );
258 /* Get the next audio data buffer */
259 block_t *p_buffer = aout_PacketNext( p_aout, play_date );
261 if( p_buffer != NULL )
263 p_src = (jack_sample_t *)p_buffer->p_buffer;
264 i_nb_samples = p_buffer->i_nb_samples;
267 /* Get the JACK buffers to write to */
268 for( i = 0; i < p_sys->i_channels; i++ )
270 p_sys->p_jack_buffers[i] = jack_port_get_buffer( p_sys->p_jack_ports[i],
274 /* Copy in the audio data */
275 for( j = 0; j < i_nb_samples; j++ )
277 for( i = 0; i < p_sys->i_channels; i++ )
279 jack_sample_t *p_dst = p_sys->p_jack_buffers[i];
285 /* Fill any remaining buffer with silence */
286 if( i_nb_samples < i_frames )
288 for( i = 0; i < p_sys->i_channels; i++ )
290 memset( p_sys->p_jack_buffers[i] + i_nb_samples, 0,
291 sizeof( jack_sample_t ) * (i_frames - i_nb_samples) );
296 block_Release( p_buffer );
300 /*****************************************************************************
301 * GraphChange: callback when JACK reorders it's process graph.
302 We update latency information.
303 *****************************************************************************/
305 static int GraphChange( void *p_arg )
307 audio_output_t *p_aout = (audio_output_t*) p_arg;
308 struct aout_sys_t *p_sys = p_aout->sys;
310 jack_nframes_t port_latency;
314 for( i = 0; i < p_sys->i_channels; ++i )
316 port_latency = jack_port_get_total_latency( p_sys->p_jack_client,
317 p_sys->p_jack_ports[i] );
318 p_sys->latency = __MAX( p_sys->latency, port_latency );
321 msg_Dbg(p_aout, "JACK graph reordered. Our maximum latency=%d.", p_sys->latency);
326 /*****************************************************************************
327 * Close: close the JACK client
328 *****************************************************************************/
329 static void Stop( audio_output_t *p_aout )
332 struct aout_sys_t *p_sys = p_aout->sys;
334 i_error = jack_deactivate( p_sys->p_jack_client );
337 msg_Err( p_aout, "jack_deactivate failed (error %d)", i_error );
340 i_error = jack_client_close( p_sys->p_jack_client );
343 msg_Err( p_aout, "jack_client_close failed (error %d)", i_error );
345 free( p_sys->p_jack_ports );
346 free( p_sys->p_jack_buffers );
347 aout_PacketDestroy( p_aout );
350 static int Open(vlc_object_t *obj)
352 audio_output_t *aout = (audio_output_t *)obj;
353 aout_sys_t *sys = calloc(1, sizeof (*sys));
355 if (unlikely(sys == NULL))
360 aout_SoftVolumeInit(aout);
364 static void Close(vlc_object_t *obj)
366 audio_output_t *aout = (audio_output_t *)obj;
367 aout_sys_t *sys = aout->sys;