1 /*****************************************************************************
2 * oss.c : OSS input module for vlc
3 *****************************************************************************
4 * Copyright (C) 2002-2009 the VideoLAN team
7 * Authors: Benjamin Pracht <bigben at videolan dot org>
8 * Richard Hosking <richard at hovis dot net>
9 * Antoine Cellerier <dionoea at videolan d.t org>
10 * Dennis Lou <dlou99 at yahoo dot com>
12 * This program is free software; you can redistribute it and/or modify
13 * it under the terms of the GNU General Public License as published by
14 * the Free Software Foundation; either version 2 of the License, or
15 * (at your option) any later version.
17 * This program is distributed in the hope that it will be useful,
18 * but WITHOUT ANY WARRANTY; without even the implied warranty of
19 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
20 * GNU General Public License for more details.
22 * You should have received a copy of the GNU General Public License
23 * along with this program; if not, write to the Free Software
24 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
25 *****************************************************************************/
27 /*****************************************************************************
29 *****************************************************************************/
35 #include <vlc_common.h>
36 #include <vlc_plugin.h>
37 #include <vlc_access.h>
38 #include <vlc_demux.h>
43 #include <sys/ioctl.h>
46 #ifdef HAVE_SYS_SOUNDCARD_H
47 # include <sys/soundcard.h>
49 #ifdef HAVE_SOUNDCARD_H
50 # include <soundcard.h>
55 /*****************************************************************************
57 *****************************************************************************/
59 static int DemuxOpen ( vlc_object_t
* );
60 static void DemuxClose( vlc_object_t
* );
63 #define STEREO_TEXT N_( "Stereo" )
64 #define STEREO_LONGTEXT N_( \
65 "Capture the audio stream in stereo." )
66 #define SAMPLERATE_TEXT N_( "Samplerate" )
67 #define SAMPLERATE_LONGTEXT N_( \
68 "Samplerate of the captured audio stream, in Hz (eg: 11025, 22050, 44100, 48000)" )
70 #define CACHING_TEXT N_("Caching value in ms")
71 #define CACHING_LONGTEXT N_( \
72 "Caching value for OSS captures. This " \
73 "value should be set in milliseconds." )
75 #define OSS_DEFAULT "/dev/dsp"
77 #define CFG_PREFIX "oss-"
80 set_shortname( N_("OSS") )
81 set_description( N_("OSS input") )
82 set_category( CAT_INPUT
)
83 set_subcategory( SUBCAT_INPUT_ACCESS
)
86 set_capability( "access_demux", 10 )
87 set_callbacks( DemuxOpen
, DemuxClose
)
89 add_bool( CFG_PREFIX
"stereo", true, NULL
, STEREO_TEXT
, STEREO_LONGTEXT
,
91 add_integer( CFG_PREFIX
"samplerate", 48000, NULL
, SAMPLERATE_TEXT
,
92 SAMPLERATE_LONGTEXT
, true )
93 add_integer( CFG_PREFIX
"caching", DEFAULT_PTS_DELAY
/ 1000, NULL
,
94 CACHING_TEXT
, CACHING_LONGTEXT
, true )
97 /*****************************************************************************
98 * Access: local prototypes
99 *****************************************************************************/
101 static int DemuxControl( demux_t
*, int, va_list );
103 static int Demux( demux_t
* );
105 static block_t
* GrabAudio( demux_t
*p_demux
);
107 static int OpenAudioDev( demux_t
* );
108 static int OpenAudioDevOss( demux_t
* );
109 static bool ProbeAudioDevOss( demux_t
*, const char *psz_device
);
119 const char *psz_device
; /* OSS device from MRL */
125 unsigned int i_sample_rate
;
127 size_t i_max_frame_size
;
131 int64_t i_next_demux_date
; /* Used to handle oss:// as input-slave properly */
134 static int FindMainDevice( demux_t
*p_demux
)
136 msg_Dbg( p_demux
, "opening device '%s'", p_demux
->p_sys
->psz_device
);
137 if( ProbeAudioDevOss( p_demux
, p_demux
->p_sys
->psz_device
) )
139 msg_Dbg( p_demux
, "'%s' is an audio device", p_demux
->p_sys
->psz_device
);
140 p_demux
->p_sys
->i_fd
= OpenAudioDev( p_demux
);
143 if( p_demux
->p_sys
->i_fd
< 0 )
148 /*****************************************************************************
149 * DemuxOpen: opens oss device, access_demux callback
150 *****************************************************************************
152 * url: <oss device>::::
154 *****************************************************************************/
155 static int DemuxOpen( vlc_object_t
*p_this
)
157 demux_t
*p_demux
= (demux_t
*)p_this
;
160 /* Only when selected */
161 if( *p_demux
->psz_access
== '\0' ) return VLC_EGENERIC
;
164 p_demux
->pf_control
= DemuxControl
;
165 p_demux
->pf_demux
= Demux
;
166 p_demux
->info
.i_update
= 0;
167 p_demux
->info
.i_title
= 0;
168 p_demux
->info
.i_seekpoint
= 0;
170 p_demux
->p_sys
= p_sys
= calloc( 1, sizeof( demux_sys_t
) );
171 if( p_sys
== NULL
) return VLC_ENOMEM
;
173 p_sys
->i_sample_rate
= var_InheritInteger( p_demux
, CFG_PREFIX
"samplerate" );
174 p_sys
->b_stereo
= var_InheritBool( p_demux
, CFG_PREFIX
"stereo" );
175 p_sys
->i_cache
= var_InheritInteger( p_demux
, CFG_PREFIX
"caching" );
178 p_sys
->p_block
= NULL
;
179 p_sys
->i_next_demux_date
= -1;
181 if( p_demux
->psz_location
&& *p_demux
->psz_location
)
182 p_sys
->psz_device
= p_demux
->psz_location
;
184 p_sys
->psz_device
= OSS_DEFAULT
;
186 if( FindMainDevice( p_demux
) != VLC_SUCCESS
)
188 DemuxClose( p_this
);
195 /*****************************************************************************
196 * Close: close device, free resources
197 *****************************************************************************/
198 static void DemuxClose( vlc_object_t
*p_this
)
200 demux_t
*p_demux
= (demux_t
*)p_this
;
201 demux_sys_t
*p_sys
= p_demux
->p_sys
;
203 if( p_sys
->i_fd
>= 0 ) close( p_sys
->i_fd
);
205 if( p_sys
->p_block
) block_Release( p_sys
->p_block
);
209 /*****************************************************************************
211 *****************************************************************************/
212 static int DemuxControl( demux_t
*p_demux
, int i_query
, va_list args
)
214 demux_sys_t
*p_sys
= p_demux
->p_sys
;
220 /* Special for access_demux */
221 case DEMUX_CAN_PAUSE
:
223 case DEMUX_CAN_CONTROL_PACE
:
224 pb
= (bool*)va_arg( args
, bool * );
228 case DEMUX_GET_PTS_DELAY
:
229 pi64
= (int64_t*)va_arg( args
, int64_t * );
230 *pi64
= (int64_t)p_sys
->i_cache
* 1000;
234 pi64
= (int64_t*)va_arg( args
, int64_t * );
238 case DEMUX_SET_NEXT_DEMUX_TIME
:
239 p_sys
->i_next_demux_date
= (int64_t)va_arg( args
, int64_t );
242 /* TODO implement others */
250 /*****************************************************************************
251 * Demux: Processes the audio frame
252 *****************************************************************************/
253 static int Demux( demux_t
*p_demux
)
255 demux_sys_t
*p_sys
= p_demux
->p_sys
;
259 fd
.events
= POLLIN
|POLLPRI
;
262 block_t
*p_block
= NULL
;
268 es_out_Send( p_demux
->out
, p_sys
->p_es
, p_block
);
273 if( poll( &fd
, 1, 10 ) ) /* Timeout after 0.01 seconds. Bigger delays are an issue when used with/as an input-slave since all the inputs run in the same thread. */
275 if( fd
.revents
& (POLLIN
|POLLPRI
) )
277 p_block
= GrabAudio( p_demux
);
279 es_out_Control( p_demux
->out
, ES_OUT_SET_PCR
, p_block
->i_pts
);
282 } while( p_block
&& p_sys
->i_next_demux_date
> 0 &&
283 p_block
->i_pts
< p_sys
->i_next_demux_date
);
286 es_out_Send( p_demux
->out
, p_sys
->p_es
, p_block
);
291 /*****************************************************************************
292 * GrabAudio: Grab an audio frame
293 *****************************************************************************/
294 static block_t
* GrabAudio( demux_t
*p_demux
)
296 demux_sys_t
*p_sys
= p_demux
->p_sys
;
297 struct audio_buf_info buf_info
;
298 int i_read
= 0, i_correct
;
301 if( p_sys
->p_block
) p_block
= p_sys
->p_block
;
302 else p_block
= block_New( p_demux
, p_sys
->i_max_frame_size
);
306 msg_Warn( p_demux
, "cannot get block" );
310 p_sys
->p_block
= p_block
;
312 i_read
= read( p_sys
->i_fd
, p_block
->p_buffer
,
313 p_sys
->i_max_frame_size
);
315 if( i_read
<= 0 ) return 0;
317 p_block
->i_buffer
= i_read
;
320 /* Correct the date because of kernel buffering */
322 if( ioctl( p_sys
->i_fd
, SNDCTL_DSP_GETISPACE
, &buf_info
) == 0 )
324 i_correct
+= buf_info
.bytes
;
328 p_block
->i_pts
= p_block
->i_dts
=
329 mdate() - INT64_C(1000000) * (mtime_t
)i_correct
/
330 2 / ( p_sys
->b_stereo
? 2 : 1) / p_sys
->i_sample_rate
;
335 /*****************************************************************************
336 * OpenAudioDev: open and set up the audio device and probe for capabilities
337 *****************************************************************************/
338 static int OpenAudioDevOss( demux_t
*p_demux
)
343 i_fd
= vlc_open( p_demux
->p_sys
->psz_device
, O_RDONLY
| O_NONBLOCK
);
347 msg_Err( p_demux
, "cannot open OSS audio device (%m)" );
351 i_format
= AFMT_S16_LE
;
352 if( ioctl( i_fd
, SNDCTL_DSP_SETFMT
, &i_format
) < 0
353 || i_format
!= AFMT_S16_LE
)
356 "cannot set audio format (16b little endian) (%m)" );
360 if( ioctl( i_fd
, SNDCTL_DSP_STEREO
,
361 &p_demux
->p_sys
->b_stereo
) < 0 )
363 msg_Err( p_demux
, "cannot set audio channels count (%m)" );
367 if( ioctl( i_fd
, SNDCTL_DSP_SPEED
,
368 &p_demux
->p_sys
->i_sample_rate
) < 0 )
370 msg_Err( p_demux
, "cannot set audio sample rate (%m)" );
374 p_demux
->p_sys
->i_max_frame_size
= 6 * 1024;
380 if( i_fd
>= 0 ) close( i_fd
);
384 static int OpenAudioDev( demux_t
*p_demux
)
386 demux_sys_t
*p_sys
= p_demux
->p_sys
;
387 int i_fd
= OpenAudioDevOss( p_demux
);
392 msg_Dbg( p_demux
, "opened adev=`%s' %s %dHz",
393 p_sys
->psz_device
, p_sys
->b_stereo
? "stereo" : "mono",
394 p_sys
->i_sample_rate
);
397 es_format_Init( &fmt
, AUDIO_ES
, VLC_CODEC_S16L
);
399 fmt
.audio
.i_channels
= p_sys
->b_stereo
? 2 : 1;
400 fmt
.audio
.i_rate
= p_sys
->i_sample_rate
;
401 fmt
.audio
.i_bitspersample
= 16;
402 fmt
.audio
.i_blockalign
= fmt
.audio
.i_channels
* fmt
.audio
.i_bitspersample
/ 8;
403 fmt
.i_bitrate
= fmt
.audio
.i_channels
* fmt
.audio
.i_rate
* fmt
.audio
.i_bitspersample
;
405 msg_Dbg( p_demux
, "new audio es %d channels %dHz",
406 fmt
.audio
.i_channels
, fmt
.audio
.i_rate
);
408 p_sys
->p_es
= es_out_Add( p_demux
->out
, &fmt
);
413 /*****************************************************************************
414 * ProbeAudioDev: probe audio for capabilities
415 *****************************************************************************/
416 static bool ProbeAudioDevOss( demux_t
*p_demux
, const char *psz_device
)
419 int i_fd
= vlc_open( psz_device
, O_RDONLY
| O_NONBLOCK
);
423 msg_Err( p_demux
, "cannot open device %s for OSS audio (%m)", psz_device
);
427 /* this will fail if the device is video */
428 if( ioctl( i_fd
, SNDCTL_DSP_GETCAPS
, &i_caps
) < 0 )
430 msg_Err( p_demux
, "cannot get audio caps (%m)" );
434 if( i_fd
>= 0 ) close( i_fd
);
439 if( i_fd
>= 0 ) close( i_fd
);