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
56 audio_sample_format_t format;
64 static int Open (vlc_object_t *);
65 static void Close (vlc_object_t *);
67 #define AUDIO_DEV_TEXT N_("Audio output device")
68 #define AUDIO_DEV_LONGTEXT N_("OSS device node path.")
71 set_shortname( "OSS" )
72 set_description (N_("Open Sound System audio output"))
73 set_category( CAT_AUDIO )
74 set_subcategory( SUBCAT_AUDIO_AOUT )
75 add_string ("oss-audio-device", "",
76 AUDIO_DEV_TEXT, AUDIO_DEV_LONGTEXT, false)
77 set_capability( "audio output", 100 )
78 set_callbacks (Open, Close)
81 static int TimeGet (audio_output_t *, mtime_t *);
82 static void Play (audio_output_t *, block_t *);
83 static void Pause (audio_output_t *, bool, mtime_t);
84 static void Flush (audio_output_t *, bool);
85 static int VolumeSync (audio_output_t *);
87 static int Start (audio_output_t *aout, audio_sample_format_t *restrict fmt)
89 aout_sys_t* sys = aout->sys;
92 const char *device = sys->device;
94 device = getenv ("OSS_AUDIODEV");
98 int fd = vlc_open (device, O_WRONLY);
101 msg_Err (aout, "cannot open OSS device %s: %m", device);
105 msg_Dbg (aout, "using OSS device: %s", device);
107 /* Select audio format */
111 switch (fmt->i_format)
120 format = AFMT_S32_NE;
123 format = AFMT_S16_NE;
129 if (AOUT_FMT_SPDIF(fmt))
130 spdif = var_InheritBool (aout, "spdif");
138 format = AFMT_S16_NE;
141 if (ioctl (fd, SNDCTL_DSP_SETFMT, &format) < 0)
143 msg_Err (aout, "cannot set audio format 0x%X: %m", format);
149 case AFMT_U8: fmt->i_format = VLC_CODEC_U8; break;
150 case AFMT_S16_NE: fmt->i_format = VLC_CODEC_S16N; break;
151 case AFMT_S32_NE: fmt->i_format = VLC_CODEC_S32N; break;
153 case AFMT_FLOAT: fmt->i_format = VLC_CODEC_FL32; break;
158 fmt->i_format = VLC_CODEC_SPDIFL;
162 msg_Err (aout, "unsupported audio format 0x%X", format);
166 /* Select channels count */
167 int channels = spdif ? 2 : aout_FormatNbChannels (fmt);
168 if (ioctl (fd, SNDCTL_DSP_CHANNELS, &channels) < 0)
170 msg_Err (aout, "cannot set %d channels: %m", channels);
176 case 1: channels = AOUT_CHAN_CENTER; break;
177 case 2: channels = AOUT_CHANS_STEREO; break;
178 case 4: channels = AOUT_CHANS_4_0; break;
179 case 6: channels = AOUT_CHANS_5_1; break;
180 case 8: channels = AOUT_CHANS_7_1; break;
182 msg_Err (aout, "unsupported channels count %d", channels);
186 /* Select sample rate */
187 int rate = spdif ? 48000 : fmt->i_rate;
188 if (ioctl (fd, SNDCTL_DSP_SPEED, &rate) < 0)
190 msg_Err (aout, "cannot set %d Hz sample rate: %m", rate);
194 /* Setup audio_output_t */
195 aout->time_get = TimeGet;
202 fmt->i_bytes_per_frame = AOUT_SPDIF_SIZE;
203 fmt->i_frame_length = A52_FRAME_NB;
208 fmt->i_original_channels =
209 fmt->i_physical_channels = channels;
211 aout_FormatPrepare (fmt);
214 sys->starting = true;
222 static int TimeGet (audio_output_t *aout, mtime_t *restrict pts)
224 aout_sys_t *sys = aout->sys;
227 if (ioctl (sys->fd, SNDCTL_DSP_GETODELAY, &delay) < 0)
229 msg_Warn (aout, "cannot get delay: %m");
233 *pts = (delay * CLOCK_FREQ * sys->format.i_frame_length)
234 / (sys->format.i_rate * sys->format.i_bytes_per_frame);
239 * Queues one audio buffer to the hardware.
241 static void Play (audio_output_t *aout, block_t *block)
243 aout_sys_t *sys = aout->sys;
246 while (block->i_buffer > 0)
248 ssize_t bytes = write (fd, block->p_buffer, block->i_buffer);
251 block->p_buffer += bytes;
252 block->i_buffer -= bytes;
255 msg_Err (aout, "cannot write samples: %m");
257 block_Release (block);
259 /* Dumb OSS cannot send any kind of events for this... */
264 * Pauses/resumes the audio playback.
266 static void Pause (audio_output_t *aout, bool pause, mtime_t date)
268 aout_sys_t *sys = aout->sys;
272 ioctl (fd, pause ? SNDCTL_DSP_SILENCE : SNDCTL_DSP_SKIP, NULL);
276 * Flushes/drains the audio playback buffer.
278 static void Flush (audio_output_t *aout, bool wait)
280 aout_sys_t *sys = aout->sys;
284 return; /* drain is implicit with OSS */
285 ioctl (fd, SNDCTL_DSP_HALT, NULL);
288 static int VolumeSync (audio_output_t *aout)
290 aout_sys_t *sys = aout->sys;
294 if (ioctl (fd, SNDCTL_DSP_GETPLAYVOL, &level) < 0)
298 if (level) /* try to keep last volume before mute */
300 aout_MuteReport (aout, !level);
301 aout_VolumeReport (aout, (float)(level & 0xFF) / 100.f);
306 * Releases the audio output device.
308 static void Stop (audio_output_t *aout)
310 aout_sys_t *sys = aout->sys;
313 ioctl (fd, SNDCTL_DSP_HALT, NULL);
318 static int VolumeSet (audio_output_t *aout, float vol)
320 aout_sys_t *sys = aout->sys;
325 int level = lroundf (vol * 100.f);
330 if (!sys->mute && ioctl (fd, SNDCTL_DSP_SETPLAYVOL, &level) < 0)
332 msg_Err (aout, "cannot set volume: %m");
337 aout_VolumeReport (aout, (float)(level & 0xFF) / 100.f);
341 static int MuteSet (audio_output_t *aout, bool mute)
343 aout_sys_t *sys = aout->sys;
348 int level = mute ? 0 : (sys->level | (sys->level << 8));
349 if (ioctl (fd, SNDCTL_DSP_SETPLAYVOL, &level) < 0)
351 msg_Err (aout, "cannot mute: %m");
356 aout_MuteReport (aout, mute);
360 static int DevicesEnum (audio_output_t *aout)
362 int fd = vlc_open ("/dev/dsp", O_WRONLY);
369 if (ioctl (fd, SNDCTL_SYSINFO, &si) < 0)
371 msg_Err (aout, "cannot get system infos: %m");
375 msg_Dbg (aout, "using %s version %s (0x%06X) under %s", si.product,
376 si.version, si.versionnum, si.license);
378 for (int i = 0; i < si.numaudios; i++)
380 oss_audioinfo ai = { .dev = i };
382 if (ioctl (fd, SNDCTL_AUDIOINFO, &ai) < 0)
384 msg_Warn (aout, "cannot get device %d infos: %m", i);
387 if (ai.caps & (PCM_CAP_HIDDEN|PCM_CAP_MODEM))
389 if (!(ai.caps & PCM_CAP_OUTPUT))
394 aout_HotplugReport (aout, ai.devnode, ai.name);
402 static int DeviceSelect (audio_output_t *aout, const char *id)
404 aout_sys_t *sys = aout->sys;
410 if (unlikely(path == NULL))
416 aout_DeviceReport (aout, path);
417 aout_RestartRequest (aout, AOUT_RESTART_OUTPUT);
421 static int Open (vlc_object_t *obj)
423 audio_output_t *aout = (audio_output_t *)obj;
425 aout_sys_t *sys = malloc (sizeof (*sys));
426 if(unlikely( sys == NULL ))
433 sys->device = var_InheritString (aout, "oss-audio-device");
438 aout->volume_set = VolumeSet;
439 aout->mute_set = MuteSet;
440 aout->device_select = DeviceSelect;
446 static void Close (vlc_object_t *obj)
448 audio_output_t *aout = (audio_output_t *)obj;
449 aout_sys_t *sys = aout->sys;