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>
39 #include <vlc_input.h>
45 #include <sys/ioctl.h>
48 #ifdef HAVE_SYS_SOUNDCARD_H
49 # include <sys/soundcard.h>
51 #ifdef HAVE_SOUNDCARD_H
52 # include <soundcard.h>
57 /*****************************************************************************
59 *****************************************************************************/
61 static int DemuxOpen ( vlc_object_t * );
62 static void DemuxClose( vlc_object_t * );
65 #define STEREO_TEXT N_( "Stereo" )
66 #define STEREO_LONGTEXT N_( \
67 "Capture the audio stream in stereo." )
68 #define SAMPLERATE_TEXT N_( "Samplerate" )
69 #define SAMPLERATE_LONGTEXT N_( \
70 "Samplerate of the captured audio stream, in Hz (eg: 11025, 22050, 44100, 48000)" )
72 #define CACHING_TEXT N_("Caching value in ms")
73 #define CACHING_LONGTEXT N_( \
74 "Caching value for OSS captures. This " \
75 "value should be set in milliseconds." )
77 #define OSS_DEFAULT "/dev/dsp"
79 #define CFG_PREFIX "oss-"
82 set_shortname( N_("OSS") )
83 set_description( N_("OSS input") )
84 set_category( CAT_INPUT )
85 set_subcategory( SUBCAT_INPUT_ACCESS )
88 set_capability( "access_demux", 10 )
89 set_callbacks( DemuxOpen, DemuxClose )
91 add_bool( CFG_PREFIX "stereo", true, NULL, STEREO_TEXT, STEREO_LONGTEXT,
93 add_integer( CFG_PREFIX "samplerate", 48000, NULL, SAMPLERATE_TEXT,
94 SAMPLERATE_LONGTEXT, true )
95 add_integer( CFG_PREFIX "caching", DEFAULT_PTS_DELAY / 1000, NULL,
96 CACHING_TEXT, CACHING_LONGTEXT, true )
99 /*****************************************************************************
100 * Access: local prototypes
101 *****************************************************************************/
103 static int DemuxControl( demux_t *, int, va_list );
105 static int Demux( demux_t * );
107 static block_t* GrabAudio( demux_t *p_demux );
109 static int OpenAudioDev( demux_t * );
110 static int OpenAudioDevOss( demux_t * );
111 static bool ProbeAudioDevOss( demux_t *, const char *psz_device );
121 const char *psz_device; /* OSS device from MRL */
127 unsigned int i_sample_rate;
129 size_t i_max_frame_size;
133 int64_t i_next_demux_date; /* Used to handle oss:// as input-slave properly */
136 static int FindMainDevice( demux_t *p_demux )
138 msg_Dbg( p_demux, "opening device '%s'", p_demux->p_sys->psz_device );
139 if( ProbeAudioDevOss( p_demux, p_demux->p_sys->psz_device ) )
141 msg_Dbg( p_demux, "'%s' is an audio device", p_demux->p_sys->psz_device );
142 p_demux->p_sys->i_fd = OpenAudioDev( p_demux );
145 if( p_demux->p_sys->i_fd < 0 )
150 /*****************************************************************************
151 * DemuxOpen: opens oss device, access_demux callback
152 *****************************************************************************
154 * url: <oss device>::::
156 *****************************************************************************/
157 static int DemuxOpen( vlc_object_t *p_this )
159 demux_t *p_demux = (demux_t*)p_this;
162 /* Only when selected */
163 if( *p_demux->psz_access == '\0' ) return VLC_EGENERIC;
166 p_demux->pf_control = DemuxControl;
167 p_demux->pf_demux = Demux;
168 p_demux->info.i_update = 0;
169 p_demux->info.i_title = 0;
170 p_demux->info.i_seekpoint = 0;
172 p_demux->p_sys = p_sys = calloc( 1, sizeof( demux_sys_t ) );
173 if( p_sys == NULL ) return VLC_ENOMEM;
175 p_sys->i_sample_rate = var_CreateGetInteger( p_demux, CFG_PREFIX "samplerate" );
176 p_sys->b_stereo = var_CreateGetBool( p_demux, CFG_PREFIX "stereo" );
177 p_sys->i_cache = var_CreateGetInteger( p_demux, CFG_PREFIX "caching" );
180 p_sys->p_block = NULL;
181 p_sys->i_next_demux_date = -1;
183 if( p_demux->psz_path && *p_demux->psz_path )
184 p_sys->psz_device = p_demux->psz_path;
186 p_sys->psz_device = OSS_DEFAULT;
188 if( FindMainDevice( p_demux ) != VLC_SUCCESS )
190 DemuxClose( p_this );
197 /*****************************************************************************
198 * Close: close device, free resources
199 *****************************************************************************/
200 static void DemuxClose( vlc_object_t *p_this )
202 demux_t *p_demux = (demux_t *)p_this;
203 demux_sys_t *p_sys = p_demux->p_sys;
205 if( p_sys->i_fd >= 0 ) close( p_sys->i_fd );
207 if( p_sys->p_block ) block_Release( p_sys->p_block );
211 /*****************************************************************************
213 *****************************************************************************/
214 static int DemuxControl( demux_t *p_demux, int i_query, va_list args )
216 demux_sys_t *p_sys = p_demux->p_sys;
222 /* Special for access_demux */
223 case DEMUX_CAN_PAUSE:
225 case DEMUX_SET_PAUSE_STATE:
226 case DEMUX_CAN_CONTROL_PACE:
227 pb = (bool*)va_arg( args, bool * );
231 case DEMUX_GET_PTS_DELAY:
232 pi64 = (int64_t*)va_arg( args, int64_t * );
233 *pi64 = (int64_t)p_sys->i_cache * 1000;
237 pi64 = (int64_t*)va_arg( args, int64_t * );
241 case DEMUX_SET_NEXT_DEMUX_TIME:
242 p_sys->i_next_demux_date = (int64_t)va_arg( args, int64_t );
245 /* TODO implement others */
253 /*****************************************************************************
254 * Demux: Processes the audio frame
255 *****************************************************************************/
256 static int Demux( demux_t *p_demux )
258 demux_sys_t *p_sys = p_demux->p_sys;
262 fd.events = POLLIN|POLLPRI;
265 block_t *p_block = NULL;
271 es_out_Send( p_demux->out, p_sys->p_es, p_block );
276 if( poll( &fd, 1, 500 ) ) /* Timeout after 0.5 seconds since I don't know if pf_demux can be blocking. */
278 if( fd.revents & (POLLIN|POLLPRI) )
280 p_block = GrabAudio( p_demux );
282 es_out_Control( p_demux->out, ES_OUT_SET_PCR, p_block->i_pts );
285 } while( p_block && p_sys->i_next_demux_date > 0 &&
286 p_block->i_pts < p_sys->i_next_demux_date );
289 es_out_Send( p_demux->out, p_sys->p_es, p_block );
294 /*****************************************************************************
295 * GrabAudio: Grab an audio frame
296 *****************************************************************************/
297 static block_t* GrabAudio( demux_t *p_demux )
299 demux_sys_t *p_sys = p_demux->p_sys;
300 struct audio_buf_info buf_info;
301 int i_read = 0, i_correct;
304 if( p_sys->p_block ) p_block = p_sys->p_block;
305 else p_block = block_New( p_demux, p_sys->i_max_frame_size );
309 msg_Warn( p_demux, "cannot get block" );
313 p_sys->p_block = p_block;
315 i_read = read( p_sys->i_fd, p_block->p_buffer,
316 p_sys->i_max_frame_size );
318 if( i_read <= 0 ) return 0;
320 p_block->i_buffer = i_read;
323 /* Correct the date because of kernel buffering */
325 if( ioctl( p_sys->i_fd, SNDCTL_DSP_GETISPACE, &buf_info ) == 0 )
327 i_correct += buf_info.bytes;
331 p_block->i_pts = p_block->i_dts =
332 mdate() - INT64_C(1000000) * (mtime_t)i_correct /
333 2 / ( p_sys->b_stereo ? 2 : 1) / p_sys->i_sample_rate;
338 /*****************************************************************************
339 * OpenAudioDev: open and set up the audio device and probe for capabilities
340 *****************************************************************************/
341 static int OpenAudioDevOss( demux_t *p_demux )
346 i_fd = open( p_demux->p_sys->psz_device, O_RDONLY | O_NONBLOCK );
350 msg_Err( p_demux, "cannot open OSS audio device (%m)" );
354 i_format = AFMT_S16_LE;
355 if( ioctl( i_fd, SNDCTL_DSP_SETFMT, &i_format ) < 0
356 || i_format != AFMT_S16_LE )
359 "cannot set audio format (16b little endian) (%m)" );
363 if( ioctl( i_fd, SNDCTL_DSP_STEREO,
364 &p_demux->p_sys->b_stereo ) < 0 )
366 msg_Err( p_demux, "cannot set audio channels count (%m)" );
370 if( ioctl( i_fd, SNDCTL_DSP_SPEED,
371 &p_demux->p_sys->i_sample_rate ) < 0 )
373 msg_Err( p_demux, "cannot set audio sample rate (%m)" );
377 p_demux->p_sys->i_max_frame_size = 6 * 1024;
383 if( i_fd >= 0 ) close( i_fd );
387 static int OpenAudioDev( demux_t *p_demux )
389 demux_sys_t *p_sys = p_demux->p_sys;
390 int i_fd = OpenAudioDevOss( p_demux );
395 msg_Dbg( p_demux, "opened adev=`%s' %s %dHz",
396 p_sys->psz_device, p_sys->b_stereo ? "stereo" : "mono",
397 p_sys->i_sample_rate );
400 es_format_Init( &fmt, AUDIO_ES, VLC_FOURCC('a','r','a','w') );
402 fmt.audio.i_channels = p_sys->b_stereo ? 2 : 1;
403 fmt.audio.i_rate = p_sys->i_sample_rate;
404 fmt.audio.i_bitspersample = 16;
405 fmt.audio.i_blockalign = fmt.audio.i_channels * fmt.audio.i_bitspersample / 8;
406 fmt.i_bitrate = fmt.audio.i_channels * fmt.audio.i_rate * fmt.audio.i_bitspersample;
408 msg_Dbg( p_demux, "new audio es %d channels %dHz",
409 fmt.audio.i_channels, fmt.audio.i_rate );
411 p_sys->p_es = es_out_Add( p_demux->out, &fmt );
416 /*****************************************************************************
417 * ProbeAudioDev: probe audio for capabilities
418 *****************************************************************************/
419 static bool ProbeAudioDevOss( demux_t *p_demux, const char *psz_device )
422 int i_fd = open( psz_device, O_RDONLY | O_NONBLOCK );
426 msg_Err( p_demux, "cannot open device %s for OSS audio (%m)", psz_device );
430 /* this will fail if the device is video */
431 if( ioctl( i_fd, SNDCTL_DSP_GETCAPS, &i_caps ) < 0 )
433 msg_Err( p_demux, "cannot get audio caps (%m)" );
437 if( i_fd >= 0 ) close( i_fd );
442 if( i_fd >= 0 ) close( i_fd );