1 /*****************************************************************************
2 * integer.c: integer software volume
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>
28 #include <vlc_aout_volume.h>
30 static int Activate (vlc_object_t *);
33 set_category (CAT_AUDIO)
34 set_subcategory (SUBCAT_AUDIO_MISC)
35 set_description (N_("Integer audio volume"))
36 set_capability ("audio volume", 9)
37 set_callbacks (Activate, NULL)
40 static void FilterS16N (audio_volume_t *, block_t *, float);
42 static int Activate (vlc_object_t *obj)
44 audio_volume_t *vol = (audio_volume_t *)obj;
49 vol->amplify = FilterS16N;
57 static void FilterS16N (audio_volume_t *vol, block_t *block, float volume)
59 int32_t mult = volume * 0x1.p16;
64 int16_t *p = (int16_t *)block->p_buffer;
68 for (size_t n = block->i_buffer / sizeof (*p); n > 0; n--)
70 *p = (*p * mult) >> 16;
77 for (size_t n = block->i_buffer / sizeof (*p); n > 0; n--)
79 int32_t v = (*p * mult) >> 12;