1 /*****************************************************************************
2 * oss.c : OSS input module for vlc
3 *****************************************************************************
4 * Copyright (C) 2002-2009 VLC authors and VideoLAN
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 it
13 * under the terms of the GNU Lesser General Public License as published by
14 * the Free Software Foundation; either version 2.1 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 Lesser General Public License for more details.
22 * You should have received a copy of the GNU Lesser General Public License
23 * along with this program; if not, write to the Free Software Foundation,
24 * 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_Alloc( 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 );