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125 lines
3.4 KiB
125 lines
3.4 KiB
/*****************************************************************************
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* integer.c: integer software volume
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*****************************************************************************
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* Copyright (C) 2011 Rémi Denis-Courmont
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU Lesser General Public License as published by
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* the Free Software Foundation; either version 2.1 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with this program; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
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*****************************************************************************/
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#ifdef HAVE_CONFIG_H
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# include "config.h"
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#endif
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#include <math.h>
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#include <limits.h>
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#include <vlc_common.h>
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#include <vlc_plugin.h>
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#include <vlc_aout.h>
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#include <vlc_aout_volume.h>
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static int Activate (vlc_object_t *);
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vlc_module_begin ()
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set_category (CAT_AUDIO)
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set_subcategory (SUBCAT_AUDIO_MISC)
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set_description (N_("Integer audio volume"))
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set_capability ("audio volume", 9)
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set_callbacks (Activate, NULL)
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vlc_module_end ()
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static void FilterS32N (audio_volume_t *vol, block_t *block, float volume)
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{
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int32_t *p = (int32_t *)block->p_buffer;
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int_fast32_t mult = lroundf (volume * 0x1.p24f);
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if (mult == (1 << 24))
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return;
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for (size_t n = block->i_buffer / sizeof (*p); n > 0; n--)
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{
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int_fast64_t s = (*p * (int_fast64_t)mult) >> INT64_C(24);
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if (s > INT32_MAX)
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s = INT32_MAX;
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else
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if (s < INT32_MIN)
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s = INT32_MIN;
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*(p++) = s;
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}
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(void) vol;
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}
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static void FilterS16N (audio_volume_t *vol, block_t *block, float volume)
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{
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int16_t *p = (int16_t *)block->p_buffer;
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int_fast16_t mult = lroundf (volume * 0x1.p8f);
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if (mult == (1 << 8))
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return;
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for (size_t n = block->i_buffer / sizeof (*p); n > 0; n--)
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{
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int_fast32_t s = (*p * (int_fast32_t)mult) >> 8;
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if (s > INT16_MAX)
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s = INT16_MAX;
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else
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if (s < INT16_MIN)
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s = INT16_MIN;
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*(p++) = s;
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}
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(void) vol;
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}
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static void FilterU8 (audio_volume_t *vol, block_t *block, float volume)
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{
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uint8_t *p = (uint8_t *)block->p_buffer;
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int_fast16_t mult = lroundf (volume * 0x1.p8f);
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if (mult == (1 << 8))
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return;
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for (size_t n = block->i_buffer / sizeof (*p); n > 0; n--)
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{
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int_fast32_t s = (((int_fast8_t)(*p - 128)) * (int_fast32_t)mult) >> 8;
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if (s > INT8_MAX)
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s = INT8_MAX;
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else
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if (s < INT8_MIN)
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s = INT8_MIN;
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*(p++) = s + 128;
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}
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(void) vol;
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}
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static int Activate (vlc_object_t *obj)
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{
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audio_volume_t *vol = (audio_volume_t *)obj;
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switch (vol->format)
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{
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case VLC_CODEC_S32N:
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vol->amplify = FilterS32N;
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break;
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case VLC_CODEC_S16N:
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vol->amplify = FilterS16N;
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break;
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case VLC_CODEC_U8:
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vol->amplify = FilterU8;
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break;
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default:
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return -1;
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}
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return 0;
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}
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