1 /*****************************************************************************
2 * amem.c : virtual LibVLC audio output plugin
3 *****************************************************************************
4 * Copyright (C) 2011 RĂ©mi Denis-Courmont
6 * This program is free software; you can redistribute it and/or modify it
7 * under the terms of the GNU Lesser General Public License as published by
8 * the Free Software Foundation; either version 2.1 of the License, or
9 * (at your option) any later version.
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU Lesser General Public License for more details.
16 * You should have received a copy of the GNU Lesser General Public License
17 * along with this program; if not, write to the Free Software Foundation,
18 * Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
19 *****************************************************************************/
25 #include <vlc_common.h>
26 #include <vlc_plugin.h>
30 static int Open (vlc_object_t *);
31 static void Close (vlc_object_t *);
34 set_shortname (N_("Audio memory"))
35 set_description (N_("Audio memory output"))
36 set_capability ("audio output", 0)
37 set_category (CAT_AUDIO)
38 set_subcategory (SUBCAT_AUDIO_AOUT)
39 set_callbacks (Open, Close)
41 add_string ("amem-format", "S16N",
42 N_("Sample format"), N_("Sample format"), false)
44 add_integer ("amem-rate", 44100,
45 N_("Sample rate"), N_("Sample rate"), false)
46 change_integer_range (1, 192000)
48 add_integer ("amem-channels", 2,
49 N_("Channels count"), N_("Channels count"), false)
50 change_integer_range (1, AOUT_CHAN_MAX)
58 void (*play) (void *opaque, const void *data, unsigned count, int64_t pts);
59 void (*pause) (void *opaque, int64_t pts);
60 void (*resume) (void *opaque, int64_t pts);
61 void (*flush) (void *opaque);
62 void (*drain) (void *opaque);
63 int (*set_volume) (void *opaque, float vol, bool mute);
64 void (*cleanup) (void *opaque);
69 static void Play (audio_output_t *aout, block_t *block,
70 mtime_t *restrict drift)
72 aout_sys_t *sys = aout->sys;
74 sys->play (sys->opaque, block->p_buffer, block->i_nb_samples,
76 block_Release (block);
80 static void Pause (audio_output_t *aout, bool paused, mtime_t date)
82 aout_sys_t *sys = aout->sys;
83 void (*cb) (void *, int64_t) = paused ? sys->pause : sys->resume;
86 cb (sys->opaque, date);
89 static void Flush (audio_output_t *aout, bool wait)
91 aout_sys_t *sys = aout->sys;
92 void (*cb) (void *) = wait ? sys->drain : sys->flush;
98 static int VolumeSet (audio_output_t *aout, float vol)
100 aout_sys_t *sys = aout->sys;
103 return sys->set_volume (sys->opaque, vol, sys->mute) ? -1 : 0;
106 static int MuteSet (audio_output_t *aout, bool mute)
108 aout_sys_t *sys = aout->sys;
111 return sys->set_volume (sys->opaque, sys->volume, mute) ? -1 : 0;
114 static int SoftVolumeSet (audio_output_t *aout, float vol)
116 aout_sys_t *sys = aout->sys;
118 vol = vol * vol * vol;
119 if (!sys->mute && aout_GainRequest (aout, vol))
125 static int SoftMuteSet (audio_output_t *aout, bool mute)
127 aout_sys_t *sys = aout->sys;
129 if (aout_GainRequest (aout, mute ? 0.f : sys->volume))
135 typedef int (*vlc_audio_format_cb) (void **, char *, unsigned *, unsigned *);
137 static int Open (vlc_object_t *obj)
139 audio_output_t *aout = (audio_output_t *)obj;
140 aout_sys_t *sys = malloc (sizeof (*sys));
141 if (unlikely(sys == NULL))
145 sys->opaque = var_InheritAddress (obj, "amem-data");
146 sys->play = var_InheritAddress (obj, "amem-play");
147 sys->pause = var_InheritAddress (obj, "amem-pause");
148 sys->resume = var_InheritAddress (obj, "amem-resume");
149 sys->flush = var_InheritAddress (obj, "amem-flush");
150 sys->drain = var_InheritAddress (obj, "amem-drain");
151 sys->set_volume = var_InheritAddress (obj, "amem-set-volume");
152 sys->cleanup = NULL; /* defer */
155 if (sys->play == NULL)
158 vlc_audio_format_cb setup = var_InheritAddress (obj, "amem-setup");
159 char format[5] = "S16N";
160 unsigned rate, channels;
164 rate = aout->format.i_rate;
165 channels = aout_FormatNbChannels(&aout->format);
167 if (setup (&sys->opaque, format, &rate, &channels))
169 /* Only call this callback if setup succeeded */
170 sys->cleanup = var_InheritAddress (obj, "amem-cleanup");
174 rate = var_InheritInteger (obj, "amem-rate");
175 channels = var_InheritInteger (obj, "amem-channels");
178 if (rate == 0 || rate > 192000
179 || channels == 0 || channels > AOUT_CHAN_MAX)
182 /* TODO: amem-format */
183 if (strcmp(format, "S16N"))
185 msg_Err (aout, "format not supported");
189 /* channel mapping */
193 aout->format.i_physical_channels = AOUT_CHAN_CENTER;
196 aout->format.i_physical_channels =
197 AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT;
200 aout->format.i_physical_channels =
201 AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_LFE;
204 aout->format.i_physical_channels =
205 AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT |
206 AOUT_CHAN_REARLEFT | AOUT_CHAN_REARRIGHT;
209 aout->format.i_physical_channels =
210 AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_CENTER |
211 AOUT_CHAN_REARLEFT | AOUT_CHAN_REARRIGHT;
214 aout->format.i_physical_channels =
215 AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_CENTER |
216 AOUT_CHAN_REARLEFT | AOUT_CHAN_REARRIGHT | AOUT_CHAN_LFE;
219 aout->format.i_physical_channels =
220 AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_CENTER |
221 AOUT_CHAN_REARCENTER | AOUT_CHAN_MIDDLELEFT |
222 AOUT_CHAN_MIDDLERIGHT | AOUT_CHAN_LFE;
225 aout->format.i_physical_channels =
226 AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_CENTER |
227 AOUT_CHAN_REARLEFT | AOUT_CHAN_REARRIGHT |
228 AOUT_CHAN_MIDDLELEFT | AOUT_CHAN_MIDDLERIGHT | AOUT_CHAN_LFE;
234 aout->format.i_format = VLC_CODEC_S16N;
235 aout->format.i_rate = rate;
236 aout->format.i_original_channels = aout->format.i_physical_channels;
238 aout->pf_play = Play;
239 aout->pf_pause = Pause;
240 aout->pf_flush = Flush;
241 if (sys->set_volume != NULL)
243 aout->volume_set = VolumeSet;
244 aout->mute_set = MuteSet;
248 aout->volume_set = SoftVolumeSet;
249 aout->mute_set = SoftMuteSet;
258 static void Close (vlc_object_t *obj)
260 audio_output_t *aout = (audio_output_t *)obj;
261 aout_sys_t *sys = aout->sys;
263 if (sys->cleanup != NULL)
264 sys->cleanup (sys->opaque);