1 /*****************************************************************************
2 * oss.c: Open Sound System audio output plugin for VLC
3 *****************************************************************************
4 * Copyright (C) 2000-2002 VLC authors and VideoLAN
5 * Copyright (C) 2007-2012 RĂ©mi Denis-Courmont
7 * Authors: Michel Kaempf <maxx@via.ecp.fr>
8 * Sam Hocevar <sam@zoy.org>
9 * Christophe Massiot <massiot@via.ecp.fr>
11 * This program is free software; you can redistribute it and/or modify it
12 * under the terms of the GNU Lesser General Public License as published by
13 * the Free Software Foundation; either version 2.1 of the License, or
14 * (at your option) any later version.
16 * This program is distributed in the hope that it will be useful,
17 * but WITHOUT ANY WARRANTY; without even the implied warranty of
18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
19 * GNU Lesser General Public License for more details.
21 * You should have received a copy of the GNU Lesser General Public License
22 * along with this program; if not, write to the Free Software Foundation,
23 * Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
24 *****************************************************************************/
32 #include <sys/types.h>
34 #include <sys/ioctl.h>
35 #ifdef HAVE_SOUNDCARD_H
36 # include <soundcard.h>
38 # include <sys/soundcard.h>
41 #ifndef SNDCTL_DSP_HALT
42 # define SNDCTL_DSP_HALT SNDCTL_DSP_RESET
45 #include <vlc_common.h>
46 #include <vlc_plugin.h>
51 #define A52_FRAME_NB 1536
59 audio_sample_format_t format;
62 static int Open (vlc_object_t *);
64 #define AUDIO_DEV_TEXT N_("Audio output device")
65 #define AUDIO_DEV_LONGTEXT N_("OSS device node path.")
68 set_shortname( "OSS" )
69 set_description (N_("Open Sound System audio output"))
70 set_category( CAT_AUDIO )
71 set_subcategory( SUBCAT_AUDIO_AOUT )
72 add_string ("oss-audio-device", "",
73 AUDIO_DEV_TEXT, AUDIO_DEV_LONGTEXT, false)
74 set_capability( "audio output", 100 )
75 set_callbacks (Open, NULL)
78 static int TimeGet (audio_output_t *, mtime_t *);
79 static void Play (audio_output_t *, block_t *);
80 static void Pause (audio_output_t *, bool, mtime_t);
81 static void Flush (audio_output_t *, bool);
82 static int VolumeSync (audio_output_t *);
83 static int VolumeSet (audio_output_t *, float);
84 static int MuteSet (audio_output_t *, bool);
86 static int DeviceChanged (vlc_object_t *obj, const char *varname,
87 vlc_value_t prev, vlc_value_t cur, void *data)
89 aout_ChannelsRestart (obj, varname, prev, cur, data);
91 if (!var_Type (obj, "oss-audio-device"))
92 var_Create (obj, "oss-audio-device", VLC_VAR_STRING);
93 var_SetString (obj, "oss-audio-device", cur.psz_string);
97 static int Start (audio_output_t *aout, audio_sample_format_t *restrict fmt)
99 aout_sys_t* sys = aout->sys;
101 /* Open the device */
103 char *devicebuf = var_InheritString (aout, "oss-audio-device");
106 device = getenv ("OSS_AUDIODEV");
110 msg_Dbg (aout, "using OSS device: %s", device);
112 int fd = vlc_open (device, O_WRONLY);
115 msg_Err (aout, "cannot open OSS device %s: %m", device);
121 /* Select audio format */
125 switch (fmt->i_format)
136 format = AFMT_S32_BE;
139 format = AFMT_S32_LE;
142 format = AFMT_S16_BE;
145 format = AFMT_S16_LE;
152 if (AOUT_FMT_SPDIF(fmt))
153 spdif = var_InheritBool (aout, "spdif");
161 format = AFMT_S16_NE;
164 if (ioctl (fd, SNDCTL_DSP_SETFMT, &format) < 0)
166 msg_Err (aout, "cannot set audio format 0x%X: %m", format);
172 case AFMT_S8: fmt->i_format = VLC_CODEC_S8; break;
173 case AFMT_U8: fmt->i_format = VLC_CODEC_U8; break;
174 case AFMT_S16_BE: fmt->i_format = VLC_CODEC_S16B; break;
175 case AFMT_S16_LE: fmt->i_format = VLC_CODEC_S16L; break;
178 case AFMT_S32_BE: fmt->i_format = VLC_CODEC_S32B; break;
179 case AFMT_S32_LE: fmt->i_format = VLC_CODEC_S32L; break;
181 case AFMT_FLOAT: fmt->i_format = VLC_CODEC_FL32; break;
186 fmt->i_format = VLC_CODEC_SPDIFL;
190 msg_Err (aout, "unsupported audio format 0x%X", format);
194 /* Select channels count */
195 int channels = spdif ? 2 : aout_FormatNbChannels (fmt);
196 if (ioctl (fd, SNDCTL_DSP_CHANNELS, &channels) < 0)
198 msg_Err (aout, "cannot set %d channels: %m", channels);
204 case 1: channels = AOUT_CHAN_CENTER; break;
205 case 2: channels = AOUT_CHANS_STEREO; break;
206 case 4: channels = AOUT_CHANS_4_0; break;
207 case 6: channels = AOUT_CHANS_5_1; break;
208 case 8: channels = AOUT_CHANS_7_1; break;
210 msg_Err (aout, "unsupported channels count %d", channels);
214 /* Select sample rate */
215 int rate = spdif ? 48000 : fmt->i_rate;
216 if (ioctl (fd, SNDCTL_DSP_SPEED, &rate) < 0)
218 msg_Err (aout, "cannot set %d Hz sample rate: %m", rate);
222 /* Setup audio_output_t */
223 aout->time_get = TimeGet;
227 aout->volume_set = NULL;
228 aout->mute_set = NULL;
232 fmt->i_bytes_per_frame = AOUT_SPDIF_SIZE;
233 fmt->i_frame_length = A52_FRAME_NB;
238 fmt->i_original_channels =
239 fmt->i_physical_channels = channels;
243 if (VolumeSync (aout) == 0)
245 aout->volume_set = VolumeSet;
246 aout->mute_set = MuteSet;
249 sys->starting = true;
251 /* Build the devices list */
252 var_Create (aout, "audio-device", VLC_VAR_STRING | VLC_VAR_HASCHOICE);
253 var_SetString (aout, "audio-device", device);
254 var_AddCallback (aout, "audio-device", DeviceChanged, NULL);
257 if (ioctl (fd, SNDCTL_SYSINFO, &si) >= 0)
259 vlc_value_t val, text;
261 text.psz_string = _("Audio Device");
262 var_Change (aout, "audio-device", VLC_VAR_SETTEXT, &text, NULL);
264 msg_Dbg (aout, "using %s version %s (0x%06X) under %s", si.product,
265 si.version, si.versionnum, si.license);
267 for (int i = 0; i < si.numaudios; i++)
269 oss_audioinfo ai = { .dev = i };
271 if (ioctl (fd, SNDCTL_AUDIOINFO, &ai) < 0)
273 msg_Warn (aout, "cannot get device %d infos: %m", i);
276 if (ai.caps & (PCM_CAP_HIDDEN|PCM_CAP_MODEM))
278 if (!(ai.caps & PCM_CAP_OUTPUT))
283 val.psz_string = ai.devnode;
284 text.psz_string = ai.name;
285 var_Change (aout, "audio-device", VLC_VAR_ADDCHOICE, &val, &text);
301 * Releases the audio output.
303 static void Stop (audio_output_t *aout)
305 aout_sys_t *sys = aout->sys;
308 var_DelCallback (aout, "audio-device", DeviceChanged, NULL);
309 var_Destroy (aout, "audio-device");
311 ioctl (fd, SNDCTL_DSP_HALT, NULL);
316 static int TimeGet (audio_output_t *aout, mtime_t *restrict pts)
318 aout_sys_t *sys = aout->sys;
321 if (ioctl (sys->fd, SNDCTL_DSP_GETODELAY, &delay) < 0)
323 msg_Warn (aout, "cannot get delay: %m");
327 *pts = mdate () + ((delay * CLOCK_FREQ * sys->format.i_frame_length)
328 / (sys->format.i_rate * sys->format.i_bytes_per_frame));
333 * Queues one audio buffer to the hardware.
335 static void Play (audio_output_t *aout, block_t *block)
337 aout_sys_t *sys = aout->sys;
340 while (block->i_buffer > 0)
342 ssize_t bytes = write (fd, block->p_buffer, block->i_buffer);
345 block->p_buffer += bytes;
346 block->i_buffer -= bytes;
349 msg_Err (aout, "cannot write samples: %m");
351 block_Release (block);
353 /* Dumb OSS cannot send any kind of events for this... */
358 * Pauses/resumes the audio playback.
360 static void Pause (audio_output_t *aout, bool pause, mtime_t date)
362 aout_sys_t *sys = aout->sys;
366 ioctl (fd, pause ? SNDCTL_DSP_SILENCE : SNDCTL_DSP_SKIP, NULL);
370 * Flushes/drains the audio playback buffer.
372 static void Flush (audio_output_t *aout, bool wait)
374 aout_sys_t *sys = aout->sys;
378 return; /* drain is implicit with OSS */
379 ioctl (fd, SNDCTL_DSP_HALT_OUTPUT, NULL);
382 static int VolumeSync (audio_output_t *aout)
384 aout_sys_t *sys = aout->sys;
388 if (ioctl (fd, SNDCTL_DSP_GETPLAYVOL, &level) < 0)
392 if (level) /* try to keep last volume before mute */
394 aout_MuteReport (aout, !level);
395 aout_VolumeReport (aout, (float)(level & 0xFF) / 100.f);
399 static int VolumeSet (audio_output_t *aout, float vol)
401 aout_sys_t *sys = aout->sys;
404 int level = lroundf (vol * 100.f);
409 if (!sys->mute && ioctl (fd, SNDCTL_DSP_SETPLAYVOL, &level) < 0)
411 msg_Err (aout, "cannot set volume: %m");
416 aout_VolumeReport (aout, (float)(level & 0xFF) / 100.f);
420 static int MuteSet (audio_output_t *aout, bool mute)
422 aout_sys_t *sys = aout->sys;
425 int level = mute ? 0 : (sys->level | (sys->level << 8));
426 if (ioctl (fd, SNDCTL_DSP_SETPLAYVOL, &level) < 0)
428 msg_Err (aout, "cannot mute: %m");
433 aout_MuteReport (aout, mute);
437 static int Open (vlc_object_t *obj)
439 audio_output_t *aout = (audio_output_t *)obj;
441 aout_sys_t *sys = malloc (sizeof (*sys));
442 if(unlikely( sys == NULL ))
445 /* FIXME: set volume/mute here */