1 /*****************************************************************************
2 * oss.c: Open Sound System audio output plugin for VLC
3 *****************************************************************************
4 * Copyright (C) 2000-2002 the VideoLAN team
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
12 * it under the terms of the GNU General Public License as published by
13 * the Free Software Foundation; either version 2 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 General Public License for more details.
21 * You should have received a copy of the GNU General Public License
22 * along with this program; if not, write to the Free Software
23 * Foundation, 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
61 static int Open (vlc_object_t *);
63 #define AUDIO_DEV_TEXT N_("Audio output device")
64 #define AUDIO_DEV_LONGTEXT N_("OSS device node path.")
67 set_shortname( "OSS" )
68 set_description (N_("Open Sound System audio output"))
69 set_category( CAT_AUDIO )
70 set_subcategory( SUBCAT_AUDIO_AOUT )
71 add_string ("oss-audio-device", "",
72 AUDIO_DEV_TEXT, AUDIO_DEV_LONGTEXT, false)
73 set_capability( "audio output", 100 )
74 set_callbacks (Open, NULL)
77 static void Play (audio_output_t *, block_t *, mtime_t *);
78 static void Pause (audio_output_t *, bool, mtime_t);
79 static void Flush (audio_output_t *, bool);
80 static int VolumeSync (audio_output_t *);
81 static int VolumeSet (audio_output_t *, float);
82 static int MuteSet (audio_output_t *, bool);
84 static int DeviceChanged (vlc_object_t *obj, const char *varname,
85 vlc_value_t prev, vlc_value_t cur, void *data)
87 aout_ChannelsRestart (obj, varname, prev, cur, data);
89 if (!var_Type (obj, "oss-audio-device"))
90 var_Create (obj, "oss-audio-device", VLC_VAR_STRING);
91 var_SetString (obj, "oss-audio-device", cur.psz_string);
95 static int Start (audio_output_t *aout, audio_sample_format_t *restrict fmt)
97 audio_output_t *aout = (audio_output_t *)obj;
101 char *devicebuf = var_InheritString (aout, "oss-audio-device");
104 device = getenv ("OSS_AUDIODEV");
108 msg_Dbg (aout, "using OSS device: %s", device);
110 int fd = vlc_open (device, O_WRONLY);
113 msg_Err (aout, "cannot open OSS device %s: %m", device);
118 aout_sys_t *sys = malloc (sizeof (*sys));
119 if (unlikely(sys == NULL))
124 /* Select audio format */
128 switch (fmt->i_format)
139 format = AFMT_S32_BE;
142 format = AFMT_S32_LE;
145 format = AFMT_S16_BE;
148 format = AFMT_S16_LE;
155 if (AOUT_FMT_SPDIF(fmt))
156 spdif = var_InheritBool (aout, "spdif");
164 format = AFMT_S16_NE;
167 if (ioctl (fd, SNDCTL_DSP_SETFMT, &format) < 0)
169 msg_Err (aout, "cannot set audio format 0x%X: %m", format);
175 case AFMT_S8: fmt->i_format = VLC_CODEC_S8; break;
176 case AFMT_U8: fmt->i_format = VLC_CODEC_U8; break;
177 case AFMT_S16_BE: fmt->i_format = VLC_CODEC_S16B; break;
178 case AFMT_S16_LE: fmt->i_format = VLC_CODEC_S16L; break;
181 case AFMT_S32_BE: fmt->i_format = VLC_CODEC_S32B; break;
182 case AFMT_S32_LE: fmt->i_format = VLC_CODEC_S32L; break;
184 case AFMT_FLOAT: fmt->i_format = VLC_CODEC_FL32; break;
189 fmt->i_format = VLC_CODEC_SPDIFL;
193 msg_Err (aout, "unsupported audio format 0x%X", format);
197 /* Select channels count */
198 int channels = spdif ? 2 : aout_FormatNbChannels (fmt);
199 if (ioctl (fd, SNDCTL_DSP_CHANNELS, &channels) < 0)
201 msg_Err (aout, "cannot set %d channels: %m", channels);
207 case 1: channels = AOUT_CHAN_CENTER; break;
208 case 2: channels = AOUT_CHANS_STEREO; break;
209 case 4: channels = AOUT_CHANS_4_0; break;
210 case 6: channels = AOUT_CHANS_5_1; break;
211 case 8: channels = AOUT_CHANS_7_1; break;
213 msg_Err (aout, "unsupported channels count %d", channels);
217 /* Select sample rate */
218 int rate = spdif ? 48000 : fmt->i_rate;
219 if (ioctl (fd, SNDCTL_DSP_SPEED, &rate) < 0)
221 msg_Err (aout, "cannot set %d Hz sample rate: %m", rate);
225 /* Setup audio_output_t */
229 aout->volume_set = NULL;
230 aout->mute_set = NULL;
234 fmt->i_bytes_per_frame = AOUT_SPDIF_SIZE;
235 fmt->i_frame_length = A52_FRAME_NB;
240 fmt->i_original_channels =
241 fmt->i_physical_channels = channels;
245 if (VolumeSync (aout) == 0)
247 aout->volume_set = VolumeSet;
248 aout->mute_set = MuteSet;
251 sys->starting = true;
253 /* Build the devices list */
254 var_Create (aout, "audio-device", VLC_VAR_STRING | VLC_VAR_HASCHOICE);
255 var_SetString (aout, "audio-device", device);
256 var_AddCallback (aout, "audio-device", DeviceChanged, NULL);
259 if (ioctl (fd, SNDCTL_SYSINFO, &si) >= 0)
261 vlc_value_t val, text;
263 text.psz_string = _("Audio Device");
264 var_Change (aout, "audio-device", VLC_VAR_SETTEXT, &text, NULL);
266 msg_Dbg (aout, "using %s version %s (0x%06X) under %s", si.product,
267 si.version, si.versionnum, si.license);
269 for (int i = 0; i < si.numaudios; i++)
271 oss_audioinfo ai = { .dev = i };
273 if (ioctl (fd, SNDCTL_AUDIOINFO, &ai) < 0)
275 msg_Warn (aout, "cannot get device %d infos: %m", i);
278 if (ai.caps & (PCM_CAP_HIDDEN|PCM_CAP_MODEM))
280 if (!(ai.caps & PCM_CAP_OUTPUT))
285 val.psz_string = ai.devnode;
286 text.psz_string = ai.name;
287 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 (obj, "audio-device", DeviceChanged, NULL);
309 var_Destroy (obj, "audio-device");
311 ioctl (fd, SNDCTL_DSP_HALT, NULL);
317 * Queues one audio buffer to the hardware.
319 static void Play (audio_output_t *aout, block_t *block,
320 mtime_t *restrict drift)
322 aout_sys_t *sys = aout->sys;
326 if (ioctl (sys->fd, SNDCTL_DSP_GETODELAY, &delay) >= 0)
328 mtime_t latency = (delay * CLOCK_FREQ * aout->format.i_frame_length)
329 / (aout->format.i_rate * aout->format.i_bytes_per_frame);
330 *drift = mdate () + latency - block->i_pts;
333 msg_Warn (aout, "cannot get delay: %m");
336 { /* Start on time */
337 /* TODO: resync on pause resumption and underflow recovery */
338 mtime_t delta = -*drift;
340 msg_Dbg(aout, "deferring start (%"PRId64" us)", delta);
344 msg_Warn(aout, "starting late (%"PRId64" us)", delta);
345 sys->starting = false;
348 while (block->i_buffer > 0)
350 ssize_t bytes = write (fd, block->p_buffer, block->i_buffer);
353 block->p_buffer += bytes;
354 block->i_buffer -= bytes;
357 msg_Err (aout, "cannot write samples: %m");
359 block_Release (block);
361 /* Dumb OSS cannot send any kind of events for this... */
366 * Pauses/resumes the audio playback.
368 static void Pause (audio_output_t *aout, bool pause, mtime_t date)
370 aout_sys_t *sys = aout->sys;
374 ioctl (fd, pause ? SNDCTL_DSP_SILENCE : SNDCTL_DSP_SKIP, NULL);
378 * Flushes/drains the audio playback buffer.
380 static void Flush (audio_output_t *aout, bool wait)
382 aout_sys_t *sys = aout->sys;
386 return; /* drain is implicit with OSS */
387 ioctl (fd, SNDCTL_DSP_HALT_OUTPUT, NULL);
390 static int VolumeSync (audio_output_t *aout)
392 aout_sys_t *sys = aout->sys;
396 if (ioctl (fd, SNDCTL_DSP_GETPLAYVOL, &level) < 0)
400 if (level) /* try to keep last volume before mute */
402 aout_MuteReport (aout, !level);
403 aout_VolumeReport (aout, (float)(level & 0xFF) / 100.f);
407 static int VolumeSet (audio_output_t *aout, float vol)
409 aout_sys_t *sys = aout->sys;
412 int level = lroundf (vol * 100.f);
417 if (!sys->mute && ioctl (fd, SNDCTL_DSP_SETPLAYVOL, &level) < 0)
419 msg_Err (aout, "cannot set volume: %m");
424 aout_VolumeReport (aout, (float)(level & 0xFF) / 100.f);
428 static int MuteSet (audio_output_t *aout, bool mute)
430 aout_sys_t *sys = aout->sys;
433 int level = mute ? 0 : (sys->level | (sys->level << 8));
434 if (ioctl (fd, SNDCTL_DSP_SETPLAYVOL, &level) < 0)
436 msg_Err (aout, "cannot mute: %m");
441 aout_MuteReport (aout, mute);
445 static int Open (vlc_object_t *obj)
447 audio_output_t *aout = (audio_output_t *)obj;
449 /* FIXME: set volume/mute here */