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 int_fast32_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 int_fast64_t s
= (*p
* (int_fast64_t)mult
) >> INT64_C(24);
64 static void FilterS16N (audio_volume_t
*vol
, block_t
*block
, float volume
)
66 int16_t *p
= (int16_t *)block
->p_buffer
;
68 int_fast16_t mult
= lroundf (volume
* 0x1.p8f
);
72 for (size_t n
= block
->i_buffer
/ sizeof (*p
); n
> 0; n
--)
74 int_fast32_t s
= (*p
* (int_fast32_t)mult
) >> 8;
85 static void FilterU8 (audio_volume_t
*vol
, block_t
*block
, float volume
)
87 uint8_t *p
= (uint8_t *)block
->p_buffer
;
89 int_fast16_t mult
= lroundf (volume
* 0x1.p8f
);
93 for (size_t n
= block
->i_buffer
/ sizeof (*p
); n
> 0; n
--)
95 int_fast32_t s
= (((int_fast8_t)(*p
- 128)) * (int_fast32_t)mult
) >> 8;
106 static int Activate (vlc_object_t
*obj
)
108 audio_volume_t
*vol
= (audio_volume_t
*)obj
;
113 vol
->amplify
= FilterS32N
;
116 vol
->amplify
= FilterS16N
;
119 vol
->amplify
= FilterU8
;