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 int (*set_volume) (void *opaque, float vol, bool mute);
59 void (*cleanup) (void *opaque);
62 static void Play (aout_instance_t *aout)
64 aout_sys_t *sys = aout->output.p_sys;
67 while ((block = aout_FifoPop(aout, &aout->output.fifo)) != NULL)
69 sys->play (sys->opaque, block->p_buffer, block->i_nb_samples,
71 block_Release (block);
75 static int VolumeSet (aout_instance_t *aout, audio_volume_t ivol, bool mute)
77 aout_sys_t *sys = aout->output.p_sys;
78 float fvol = ivol / (float)AOUT_VOLUME_DEFAULT;
80 return sys->set_volume (sys->opaque, fvol, mute) ? -1 : 0;
83 typedef int (*vlc_audio_format_cb) (void **, char *, unsigned *, unsigned *);
85 static int Open (vlc_object_t *obj)
87 aout_instance_t *aout = (aout_instance_t *)obj;
88 aout_sys_t *sys = malloc (sizeof (*sys));
89 if (unlikely(sys == NULL))
92 aout->output.p_sys = sys;
93 sys->opaque = var_InheritAddress (obj, "amem-data");
94 sys->play = var_InheritAddress (obj, "amem-play");
95 sys->set_volume = var_InheritAddress (obj, "amem-set-volume");
96 sys->cleanup = NULL; /* defer */
97 if (sys->play == NULL)
100 vlc_audio_format_cb setup = var_InheritAddress (obj, "amem-setup");
101 char format[5] = "S16N";
102 unsigned rate, channels;
106 rate = aout->output.output.i_rate;
107 channels = aout_FormatNbChannels(&aout->output.output);
109 if (setup (&sys->opaque, format, &rate, &channels))
111 /* Only call this callback if setup succeeded */
112 sys->cleanup = var_InheritAddress (obj, "amem-cleanup");
116 rate = var_InheritInteger (obj, "amem-rate");
117 channels = var_InheritInteger (obj, "amem-channels");
120 if (rate == 0 || rate > 192000
121 || channels == 0 || channels > AOUT_CHAN_MAX)
124 /* TODO: amem-format */
125 /* FIXME/TODO channel mapping */
126 if (strcmp(format, "S16N") || aout->output.output.i_channels != channels)
128 msg_Err (aout, "format not supported");
131 aout->output.output.i_format = VLC_CODEC_S16N;
132 aout->output.output.i_rate = rate;
134 aout->output.pf_play = Play;
135 if (sys->set_volume != NULL)
136 aout->output.pf_volume_set = VolumeSet;
138 aout_VolumeSoftInit (aout);
146 static void Close (vlc_object_t *obj)
148 aout_instance_t *aout = (aout_instance_t *)obj;
149 aout_sys_t *sys = aout->output.p_sys;
151 if (sys->cleanup != NULL)
152 sys->cleanup (sys->opaque);