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 *****************************************************************************/
33 #include <sys/types.h>
35 #include <sys/ioctl.h>
36 #ifdef HAVE_SOUNDCARD_H
37 # include <soundcard.h>
39 # include <sys/soundcard.h>
42 #ifndef SNDCTL_DSP_HALT
43 # define SNDCTL_DSP_HALT SNDCTL_DSP_RESET
46 #include <vlc_common.h>
47 #include <vlc_plugin.h>
52 #define A52_FRAME_NB 1536
57 audio_sample_format_t format;
66 static int Open (vlc_object_t *);
67 static void Close (vlc_object_t *);
69 #define AUDIO_DEV_TEXT N_("Audio output device")
70 #define AUDIO_DEV_LONGTEXT N_("OSS device node path.")
73 set_shortname( "OSS" )
74 set_description (N_("Open Sound System audio output"))
75 set_category( CAT_AUDIO )
76 set_subcategory( SUBCAT_AUDIO_AOUT )
77 add_string ("oss-audio-device", "",
78 AUDIO_DEV_TEXT, AUDIO_DEV_LONGTEXT, false)
80 set_capability( "audio output", 100 )
81 set_callbacks (Open, Close)
84 static int TimeGet (audio_output_t *, mtime_t *);
85 static void Play (audio_output_t *, block_t *);
86 static void Pause (audio_output_t *, bool, mtime_t);
87 static void Flush (audio_output_t *, bool);
89 static int Start (audio_output_t *aout, audio_sample_format_t *restrict fmt)
91 aout_sys_t* sys = aout->sys;
94 const char *device = sys->device;
96 device = getenv ("OSS_AUDIODEV");
100 int fd = vlc_open (device, O_WRONLY);
103 msg_Err (aout, "cannot open OSS device %s: %s", device,
104 vlc_strerror_c(errno));
107 msg_Dbg (aout, "using OSS device: %s", device);
109 /* Select audio format */
113 switch (fmt->i_format)
122 format = AFMT_S32_NE;
125 format = AFMT_S16_NE;
131 if (AOUT_FMT_SPDIF(fmt))
132 spdif = var_InheritBool (aout, "spdif");
140 format = AFMT_S16_NE;
143 if (ioctl (fd, SNDCTL_DSP_SETFMT, &format) < 0)
145 msg_Err (aout, "cannot set audio format 0x%X: %s", format,
146 vlc_strerror_c(errno));
152 case AFMT_U8: fmt->i_format = VLC_CODEC_U8; break;
153 case AFMT_S16_NE: fmt->i_format = VLC_CODEC_S16N; break;
154 case AFMT_S32_NE: fmt->i_format = VLC_CODEC_S32N; break;
156 case AFMT_FLOAT: fmt->i_format = VLC_CODEC_FL32; break;
161 fmt->i_format = VLC_CODEC_SPDIFL;
165 msg_Err (aout, "unsupported audio format 0x%X", format);
169 /* Select channels count */
170 int channels = spdif ? 2 : aout_FormatNbChannels (fmt);
171 if (ioctl (fd, SNDCTL_DSP_CHANNELS, &channels) < 0)
173 msg_Err (aout, "cannot set %d channels: %s", channels,
174 vlc_strerror_c(errno));
180 case 1: channels = AOUT_CHAN_CENTER; break;
181 case 2: channels = AOUT_CHANS_STEREO; break;
182 case 4: channels = AOUT_CHANS_4_0; break;
183 case 6: channels = AOUT_CHANS_5_1; break;
184 case 8: channels = AOUT_CHANS_7_1; break;
186 msg_Err (aout, "unsupported channels count %d", channels);
190 /* Select sample rate */
191 int rate = spdif ? 48000 : fmt->i_rate;
192 if (ioctl (fd, SNDCTL_DSP_SPEED, &rate) < 0)
194 msg_Err (aout, "cannot set %d Hz sample rate: %s", rate,
195 vlc_strerror_c(errno));
199 /* Setup audio_output_t */
200 aout->time_get = TimeGet;
207 fmt->i_bytes_per_frame = AOUT_SPDIF_SIZE;
208 fmt->i_frame_length = A52_FRAME_NB;
213 fmt->i_original_channels =
214 fmt->i_physical_channels = channels;
216 aout_FormatPrepare (fmt);
221 bytes = AOUT_SPDIF_SIZE;
223 bytes = fmt->i_rate / (CLOCK_FREQ / AOUT_MIN_PREPARE_TIME)
224 * fmt->i_bytes_per_frame;
225 if (unlikely(bytes < 16))
228 int frag = (AOUT_MAX_ADVANCE_TIME / AOUT_MIN_PREPARE_TIME) << 16
229 | (32 - clz32(bytes - 1));
230 if (ioctl (fd, SNDCTL_DSP_SETFRAGMENT, &frag) < 0)
231 msg_Err (aout, "cannot set 0x%08x fragment: %s", frag,
232 vlc_strerror_c(errno));
235 aout_SoftVolumeStart (aout);
236 sys->starting = true;
244 static int TimeGet (audio_output_t *aout, mtime_t *restrict pts)
246 aout_sys_t *sys = aout->sys;
249 if (ioctl (sys->fd, SNDCTL_DSP_GETODELAY, &delay) < 0)
251 msg_Warn (aout, "cannot get delay: %s", vlc_strerror_c(errno));
255 *pts = (delay * CLOCK_FREQ * sys->format.i_frame_length)
256 / (sys->format.i_rate * sys->format.i_bytes_per_frame);
261 * Queues one audio buffer to the hardware.
263 static void Play (audio_output_t *aout, block_t *block)
265 aout_sys_t *sys = aout->sys;
268 while (block->i_buffer > 0)
270 ssize_t bytes = write (fd, block->p_buffer, block->i_buffer);
273 block->p_buffer += bytes;
274 block->i_buffer -= bytes;
277 msg_Err (aout, "cannot write samples: %s", vlc_strerror_c(errno));
279 block_Release (block);
283 * Pauses/resumes the audio playback.
285 static void Pause (audio_output_t *aout, bool pause, mtime_t date)
287 aout_sys_t *sys = aout->sys;
291 ioctl (fd, pause ? SNDCTL_DSP_SILENCE : SNDCTL_DSP_SKIP, NULL);
295 * Flushes/drains the audio playback buffer.
297 static void Flush (audio_output_t *aout, bool wait)
299 aout_sys_t *sys = aout->sys;
303 return; /* drain is implicit with OSS */
304 ioctl (fd, SNDCTL_DSP_HALT, NULL);
308 * Releases the audio output device.
310 static void Stop (audio_output_t *aout)
312 aout_sys_t *sys = aout->sys;
315 ioctl (fd, SNDCTL_DSP_HALT, NULL);
320 static int DevicesEnum (audio_output_t *aout)
322 int fd = vlc_open ("/dev/dsp", O_WRONLY);
329 if (ioctl (fd, SNDCTL_SYSINFO, &si) < 0)
331 msg_Err (aout, "cannot get system infos: %s", vlc_strerror(errno));
335 msg_Dbg (aout, "using %s version %s (0x%06X) under %s", si.product,
336 si.version, si.versionnum, si.license);
338 for (int i = 0; i < si.numaudios; i++)
340 oss_audioinfo ai = { .dev = i };
342 if (ioctl (fd, SNDCTL_AUDIOINFO, &ai) < 0)
344 msg_Warn (aout, "cannot get device %d infos: %s", i,
345 vlc_strerror_c(errno));
348 if (ai.caps & (PCM_CAP_HIDDEN|PCM_CAP_MODEM))
350 if (!(ai.caps & PCM_CAP_OUTPUT))
355 aout_HotplugReport (aout, ai.devnode, ai.name);
363 static int DeviceSelect (audio_output_t *aout, const char *id)
365 aout_sys_t *sys = aout->sys;
371 if (unlikely(path == NULL))
377 aout_DeviceReport (aout, path);
378 aout_RestartRequest (aout, AOUT_RESTART_OUTPUT);
382 static int Open (vlc_object_t *obj)
384 audio_output_t *aout = (audio_output_t *)obj;
386 aout_sys_t *sys = malloc (sizeof (*sys));
387 if(unlikely( sys == NULL ))
391 sys->device = var_InheritString (aout, "oss-audio-device");
396 aout->device_select = DeviceSelect;
397 aout_SoftVolumeInit (aout);
403 static void Close (vlc_object_t *obj)
405 audio_output_t *aout = (audio_output_t *)obj;
406 aout_sys_t *sys = aout->sys;