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 *****************************************************************************/
28 #include <vlc_common.h>
29 #include <vlc_plugin.h>
31 #include <vlc_aout_volume.h>
33 static int Activate (vlc_object_t *);
36 set_category (CAT_AUDIO)
37 set_subcategory (SUBCAT_AUDIO_MISC)
38 set_description (N_("Integer audio volume"))
39 set_capability ("audio volume", 9)
40 set_callbacks (Activate, NULL)
43 static void FilterS32N (audio_volume_t *vol, block_t *block, float volume)
45 int32_t *p = (int32_t *)block->p_buffer;
47 int32_t mult = lroundf (volume * 0x1.p24f);
48 if (mult == (1 << 24))
51 for (size_t n = block->i_buffer / sizeof (*p); n > 0; n--)
53 int64_t s = *p * (int64_t)mult;
54 if (s >= ((int64_t)INT32_MAX << INT64_C(24)))
57 if (s < ((int64_t)INT32_MIN << INT64_C(24)))
60 *p = s >> INT64_C(24);
66 static void FilterS16N (audio_volume_t *vol, block_t *block, float volume)
68 int16_t *p = (int16_t *)block->p_buffer;
70 int16_t mult = lroundf (volume * 0x1.p8f);
74 for (size_t n = block->i_buffer / sizeof (*p); n > 0; n--)
76 int32_t s = *p * (int32_t)mult;
77 if (s >= (INT16_MAX << 8))
80 if (s < (INT16_MIN << 8))
89 static void FilterU8 (audio_volume_t *vol, block_t *block, float volume)
91 uint8_t *p = (uint8_t *)block->p_buffer;
93 int16_t mult = lroundf (volume * 0x1.p8f);
97 for (size_t n = block->i_buffer / sizeof (*p); n > 0; n--)
99 int32_t s = (*p - 128) * mult;
100 if (s >= (INT8_MAX << 8))
103 if (s < (INT8_MIN << 8))
112 static int Activate (vlc_object_t *obj)
114 audio_volume_t *vol = (audio_volume_t *)obj;
119 vol->amplify = FilterS32N;
122 vol->amplify = FilterS16N;
125 vol->amplify = FilterU8;