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# src/pcm_utils.h

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    00001 /*
    00002  * Copyright (C) 2003-2010 The Music Player Daemon Project
    00003  * http://www.musicpd.org
    00004  *
    00005  * This program is free software; you can redistribute it and/or modify
    00006  * it under the terms of the GNU General Public License as published by
    00007  * the Free Software Foundation; either version 2 of the License, or
    00008  * (at your option) any later version.
    00009  *
    00010  * This program is distributed in the hope that it will be useful,
    00011  * but WITHOUT ANY WARRANTY; without even the implied warranty of
    00012  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    00013  * GNU General Public License for more details.
    00014  *
    00015  * You should have received a copy of the GNU General Public License along
    00016  * with this program; if not, write to the Free Software Foundation, Inc.,
    00017  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
    00018  */
    00019
    00020 #ifndef MPD_PCM_UTILS_H
    00021 #define MPD_PCM_UTILS_H
    00022
    00023 #include <glib.h>
    00024
    00025 #include <stdint.h>
    00026
    00031 static inline int32_t
    00032 pcm_range(int32_t sample, unsigned bits)
    00033 {
    00034         if (G_UNLIKELY(sample < (-1 << (bits - 1))))
    00035                 return -1 << (bits - 1);
    00036         if (G_UNLIKELY(sample >= (1 << (bits - 1))))
    00037                 return (1 << (bits - 1)) - 1;
    00038         return sample;
    00039 }
    00040
    00045 static inline int64_t
    00046 pcm_range_64(int64_t sample, unsigned bits)
    00047 {
    00048         if (G_UNLIKELY(sample < ((int64_t)-1 << (bits - 1))))
    00049                 return (int64_t)-1 << (bits - 1);
    00050         if (G_UNLIKELY(sample >= ((int64_t)1 << (bits - 1))))
    00051                 return ((int64_t)1 << (bits - 1)) - 1;
    00052         return sample;
    00053 }
    00054
    00055 #endif