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
7 * it 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 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
18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
19 *****************************************************************************/
25 #include <vlc_common.h>
26 #include <vlc_plugin.h>
29 static int Open (vlc_object_t *);
30 static void Close (vlc_object_t *);
33 set_shortname (N_("Audio memory"))
34 set_description (N_("Audio memory output"))
35 set_capability ("audio output", 0)
36 set_category (CAT_AUDIO)
37 set_subcategory (SUBCAT_AUDIO_AOUT)
38 set_callbacks (Open, Close)
40 add_string ("amem-format", "S16N",
41 N_("Sample format"), N_("Sample format"), false)
43 add_integer ("amem-rate", 44100,
44 N_("Sample rate"), N_("Sample rate"), false)
45 change_integer_range (1, 192000)
47 add_integer ("amem-channels", 2,
48 N_("Channels count"), N_("Channels count"), false)
49 change_integer_range (1, AOUT_CHAN_MAX)
57 void (*play) (void *opaque, const void *data, unsigned count, int64_t pts);
58 void (*pause) (void *opaque, int64_t pts);
59 void (*resume) (void *opaque, int64_t pts);
60 void (*flush) (void *opaque);
61 void (*drain) (void *opaque);
62 int (*set_volume) (void *opaque, float vol, bool mute);
63 void (*cleanup) (void *opaque);
66 static void Play (audio_output_t *aout, block_t *block)
68 aout_sys_t *sys = aout->sys;
70 sys->play (sys->opaque, block->p_buffer, block->i_nb_samples,
72 block_Release (block);
75 static void Pause (audio_output_t *aout, bool paused, mtime_t date)
77 aout_sys_t *sys = aout->sys;
78 void (*cb) (void *, int64_t) = paused ? sys->pause : sys->resume;
81 cb (sys->opaque, date);
84 static void Flush (audio_output_t *aout, bool wait)
86 aout_sys_t *sys = aout->sys;
87 void (*cb) (void *) = wait ? sys->drain : sys->flush;
93 static int VolumeSet (audio_output_t *aout, float vol, bool mute)
95 aout_sys_t *sys = aout->sys;
97 return sys->set_volume (sys->opaque, vol, mute) ? -1 : 0;
100 typedef int (*vlc_audio_format_cb) (void **, char *, unsigned *, unsigned *);
102 static int Open (vlc_object_t *obj)
104 audio_output_t *aout = (audio_output_t *)obj;
105 aout_sys_t *sys = malloc (sizeof (*sys));
106 if (unlikely(sys == NULL))
110 sys->opaque = var_InheritAddress (obj, "amem-data");
111 sys->play = var_InheritAddress (obj, "amem-play");
112 sys->pause = var_InheritAddress (obj, "amem-pause");
113 sys->resume = var_InheritAddress (obj, "amem-resume");
114 sys->flush = var_InheritAddress (obj, "amem-flush");
115 sys->drain = var_InheritAddress (obj, "amem-drain");
116 sys->set_volume = var_InheritAddress (obj, "amem-set-volume");
117 sys->cleanup = NULL; /* defer */
118 if (sys->play == NULL)
121 vlc_audio_format_cb setup = var_InheritAddress (obj, "amem-setup");
122 char format[5] = "S16N";
123 unsigned rate, channels;
127 rate = aout->format.i_rate;
128 channels = aout_FormatNbChannels(&aout->format);
130 if (setup (&sys->opaque, format, &rate, &channels))
132 /* Only call this callback if setup succeeded */
133 sys->cleanup = var_InheritAddress (obj, "amem-cleanup");
137 rate = var_InheritInteger (obj, "amem-rate");
138 channels = var_InheritInteger (obj, "amem-channels");
141 if (rate == 0 || rate > 192000
142 || channels == 0 || channels > AOUT_CHAN_MAX)
145 /* TODO: amem-format */
146 /* FIXME/TODO channel mapping */
147 if (strcmp(format, "S16N") || aout->format.i_channels != channels)
149 msg_Err (aout, "format not supported");
152 aout->format.i_format = VLC_CODEC_S16N;
153 aout->format.i_rate = rate;
155 aout->pf_play = Play;
156 aout->pf_pause = Pause;
157 aout->pf_flush = Flush;
158 if (sys->set_volume != NULL)
159 aout->pf_volume_set = VolumeSet;
161 aout_VolumeSoftInit (aout);
169 static void Close (vlc_object_t *obj)
171 audio_output_t *aout = (audio_output_t *)obj;
172 aout_sys_t *sys = aout->sys;
174 if (sys->cleanup != NULL)
175 sys->cleanup (sys->opaque);