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>
44 #include <sys/ioctl.h>
47 #ifdef HAVE_SYS_SOUNDCARD_H
48 # include <sys/soundcard.h>
50 #ifdef HAVE_SOUNDCARD_H
51 # include <soundcard.h>
56 /*****************************************************************************
58 *****************************************************************************/
60 static int DemuxOpen ( vlc_object_t
* );
61 static void DemuxClose( vlc_object_t
* );
64 #define STEREO_TEXT N_( "Stereo" )
65 #define STEREO_LONGTEXT N_( \
66 "Capture the audio stream in stereo." )
67 #define SAMPLERATE_TEXT N_( "Samplerate" )
68 #define SAMPLERATE_LONGTEXT N_( \
69 "Samplerate of the captured audio stream, in Hz (eg: 11025, 22050, 44100, 48000)" )
71 #define OSS_DEFAULT "/dev/dsp"
73 #define CFG_PREFIX "oss-"
76 set_shortname( N_("OSS") )
77 set_description( N_("OSS input") )
78 set_category( CAT_INPUT
)
79 set_subcategory( SUBCAT_INPUT_ACCESS
)
82 set_capability( "access_demux", 10 )
83 set_callbacks( DemuxOpen
, DemuxClose
)
85 add_bool( CFG_PREFIX
"stereo", true, STEREO_TEXT
, STEREO_LONGTEXT
,
87 add_integer( CFG_PREFIX
"samplerate", 48000, SAMPLERATE_TEXT
,
88 SAMPLERATE_LONGTEXT
, true )
91 /*****************************************************************************
92 * Access: local prototypes
93 *****************************************************************************/
95 static int DemuxControl( demux_t
*, int, va_list );
97 static int Demux( demux_t
* );
99 static block_t
* GrabAudio( demux_t
*p_demux
);
101 static int OpenAudioDev( demux_t
* );
102 static int OpenAudioDevOss( demux_t
* );
103 static bool ProbeAudioDevOss( demux_t
*, const char *psz_device
);
113 const char *psz_device
; /* OSS device from MRL */
118 unsigned int i_sample_rate
;
120 size_t i_max_frame_size
;
124 int64_t i_next_demux_date
; /* Used to handle oss:// as input-slave properly */
127 static int FindMainDevice( demux_t
*p_demux
)
129 msg_Dbg( p_demux
, "opening device '%s'", p_demux
->p_sys
->psz_device
);
130 if( ProbeAudioDevOss( p_demux
, p_demux
->p_sys
->psz_device
) )
132 msg_Dbg( p_demux
, "'%s' is an audio device", p_demux
->p_sys
->psz_device
);
133 p_demux
->p_sys
->i_fd
= OpenAudioDev( p_demux
);
136 if( p_demux
->p_sys
->i_fd
< 0 )
141 /*****************************************************************************
142 * DemuxOpen: opens oss device, access_demux callback
143 *****************************************************************************
145 * url: <oss device>::::
147 *****************************************************************************/
148 static int DemuxOpen( vlc_object_t
*p_this
)
150 demux_t
*p_demux
= (demux_t
*)p_this
;
153 /* Only when selected */
154 if( *p_demux
->psz_access
== '\0' ) return VLC_EGENERIC
;
157 p_demux
->pf_control
= DemuxControl
;
158 p_demux
->pf_demux
= Demux
;
159 p_demux
->info
.i_update
= 0;
160 p_demux
->info
.i_title
= 0;
161 p_demux
->info
.i_seekpoint
= 0;
163 p_demux
->p_sys
= p_sys
= calloc( 1, sizeof( demux_sys_t
) );
164 if( p_sys
== NULL
) return VLC_ENOMEM
;
166 p_sys
->i_sample_rate
= var_InheritInteger( p_demux
, CFG_PREFIX
"samplerate" );
167 p_sys
->b_stereo
= var_InheritBool( p_demux
, CFG_PREFIX
"stereo" );
170 p_sys
->p_block
= NULL
;
171 p_sys
->i_next_demux_date
= -1;
173 if( p_demux
->psz_location
&& *p_demux
->psz_location
)
174 p_sys
->psz_device
= p_demux
->psz_location
;
176 p_sys
->psz_device
= OSS_DEFAULT
;
178 if( FindMainDevice( p_demux
) != VLC_SUCCESS
)
180 DemuxClose( p_this
);
187 /*****************************************************************************
188 * Close: close device, free resources
189 *****************************************************************************/
190 static void DemuxClose( vlc_object_t
*p_this
)
192 demux_t
*p_demux
= (demux_t
*)p_this
;
193 demux_sys_t
*p_sys
= p_demux
->p_sys
;
195 if( p_sys
->i_fd
>= 0 ) close( p_sys
->i_fd
);
197 if( p_sys
->p_block
) block_Release( p_sys
->p_block
);
201 /*****************************************************************************
203 *****************************************************************************/
204 static int DemuxControl( demux_t
*p_demux
, int i_query
, va_list args
)
206 demux_sys_t
*p_sys
= p_demux
->p_sys
;
212 /* Special for access_demux */
213 case DEMUX_CAN_PAUSE
:
215 case DEMUX_CAN_CONTROL_PACE
:
216 pb
= (bool*)va_arg( args
, bool * );
220 case DEMUX_GET_PTS_DELAY
:
221 pi64
= (int64_t*)va_arg( args
, int64_t * );
222 *pi64
= INT64_C(1000)
223 * var_InheritInteger( p_demux
, "live-caching" );
227 pi64
= (int64_t*)va_arg( args
, int64_t * );
231 case DEMUX_SET_NEXT_DEMUX_TIME
:
232 p_sys
->i_next_demux_date
= (int64_t)va_arg( args
, int64_t );
235 /* TODO implement others */
243 /*****************************************************************************
244 * Demux: Processes the audio frame
245 *****************************************************************************/
246 static int Demux( demux_t
*p_demux
)
248 demux_sys_t
*p_sys
= p_demux
->p_sys
;
252 fd
.events
= POLLIN
|POLLPRI
;
255 block_t
*p_block
= NULL
;
261 es_out_Send( p_demux
->out
, p_sys
->p_es
, p_block
);
266 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. */
270 if( fd
.revents
& (POLLIN
|POLLPRI
) )
272 p_block
= GrabAudio( p_demux
);
274 es_out_Control( p_demux
->out
, ES_OUT_SET_PCR
, p_block
->i_pts
);
277 } while( p_block
&& p_sys
->i_next_demux_date
> 0 &&
278 p_block
->i_pts
< p_sys
->i_next_demux_date
);
281 es_out_Send( p_demux
->out
, p_sys
->p_es
, p_block
);
286 /*****************************************************************************
287 * GrabAudio: Grab an audio frame
288 *****************************************************************************/
289 static block_t
* GrabAudio( demux_t
*p_demux
)
291 demux_sys_t
*p_sys
= p_demux
->p_sys
;
292 struct audio_buf_info buf_info
;
293 int i_read
= 0, i_correct
;
296 if( p_sys
->p_block
) p_block
= p_sys
->p_block
;
297 else p_block
= block_New( p_demux
, p_sys
->i_max_frame_size
);
301 msg_Warn( p_demux
, "cannot get block" );
305 p_sys
->p_block
= p_block
;
307 i_read
= read( p_sys
->i_fd
, p_block
->p_buffer
,
308 p_sys
->i_max_frame_size
);
310 if( i_read
<= 0 ) return NULL
;
312 p_block
->i_buffer
= i_read
;
313 p_sys
->p_block
= NULL
;
315 /* Correct the date because of kernel buffering */
317 if( ioctl( p_sys
->i_fd
, SNDCTL_DSP_GETISPACE
, &buf_info
) == 0 )
319 i_correct
+= buf_info
.bytes
;
323 p_block
->i_pts
= p_block
->i_dts
=
324 mdate() - INT64_C(1000000) * (mtime_t
)i_correct
/
325 2 / ( p_sys
->b_stereo
? 2 : 1) / p_sys
->i_sample_rate
;
330 /*****************************************************************************
331 * OpenAudioDev: open and set up the audio device and probe for capabilities
332 *****************************************************************************/
333 static int OpenAudioDevOss( demux_t
*p_demux
)
338 i_fd
= vlc_open( p_demux
->p_sys
->psz_device
, O_RDONLY
| O_NONBLOCK
);
342 msg_Err( p_demux
, "cannot open OSS audio device (%m)" );
346 i_format
= AFMT_S16_LE
;
347 if( ioctl( i_fd
, SNDCTL_DSP_SETFMT
, &i_format
) < 0
348 || i_format
!= AFMT_S16_LE
)
351 "cannot set audio format (16b little endian) (%m)" );
355 if( ioctl( i_fd
, SNDCTL_DSP_STEREO
,
356 &p_demux
->p_sys
->b_stereo
) < 0 )
358 msg_Err( p_demux
, "cannot set audio channels count (%m)" );
362 if( ioctl( i_fd
, SNDCTL_DSP_SPEED
,
363 &p_demux
->p_sys
->i_sample_rate
) < 0 )
365 msg_Err( p_demux
, "cannot set audio sample rate (%m)" );
369 p_demux
->p_sys
->i_max_frame_size
= 6 * 1024;
375 if( i_fd
>= 0 ) close( i_fd
);
379 static int OpenAudioDev( demux_t
*p_demux
)
381 demux_sys_t
*p_sys
= p_demux
->p_sys
;
382 int i_fd
= OpenAudioDevOss( p_demux
);
387 msg_Dbg( p_demux
, "opened adev=`%s' %s %dHz",
388 p_sys
->psz_device
, p_sys
->b_stereo
? "stereo" : "mono",
389 p_sys
->i_sample_rate
);
392 es_format_Init( &fmt
, AUDIO_ES
, VLC_CODEC_S16L
);
394 fmt
.audio
.i_channels
= p_sys
->b_stereo
? 2 : 1;
395 fmt
.audio
.i_rate
= p_sys
->i_sample_rate
;
396 fmt
.audio
.i_bitspersample
= 16;
397 fmt
.audio
.i_blockalign
= fmt
.audio
.i_channels
* fmt
.audio
.i_bitspersample
/ 8;
398 fmt
.i_bitrate
= fmt
.audio
.i_channels
* fmt
.audio
.i_rate
* fmt
.audio
.i_bitspersample
;
400 msg_Dbg( p_demux
, "new audio es %d channels %dHz",
401 fmt
.audio
.i_channels
, fmt
.audio
.i_rate
);
403 p_sys
->p_es
= es_out_Add( p_demux
->out
, &fmt
);
408 /*****************************************************************************
409 * ProbeAudioDev: probe audio for capabilities
410 *****************************************************************************/
411 static bool ProbeAudioDevOss( demux_t
*p_demux
, const char *psz_device
)
414 int i_fd
= vlc_open( psz_device
, O_RDONLY
| O_NONBLOCK
);
418 msg_Err( p_demux
, "cannot open device %s for OSS audio (%m)", psz_device
);
422 /* this will fail if the device is video */
423 if( ioctl( i_fd
, SNDCTL_DSP_GETCAPS
, &i_caps
) < 0 )
425 msg_Err( p_demux
, "cannot get audio caps (%m)" );
429 if( i_fd
>= 0 ) close( i_fd
);
434 if( i_fd
>= 0 ) close( i_fd
);