MPD 0.17~git
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00001 /* 00002 * Copyright (C) 2003-2011 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 00032 static inline const void * 00033 pcm_end_pointer(const void *p, size_t size) 00034 { 00035 return (const char *)p + size; 00036 } 00037 00042 static inline int32_t 00043 pcm_range(int32_t sample, unsigned bits) 00044 { 00045 if (G_UNLIKELY(sample < (-1 << (bits - 1)))) 00046 return -1 << (bits - 1); 00047 if (G_UNLIKELY(sample >= (1 << (bits - 1)))) 00048 return (1 << (bits - 1)) - 1; 00049 return sample; 00050 } 00051 00056 static inline int64_t 00057 pcm_range_64(int64_t sample, unsigned bits) 00058 { 00059 if (G_UNLIKELY(sample < ((int64_t)-1 << (bits - 1)))) 00060 return (int64_t)-1 << (bits - 1); 00061 if (G_UNLIKELY(sample >= ((int64_t)1 << (bits - 1)))) 00062 return ((int64_t)1 << (bits - 1)) - 1; 00063 return sample; 00064 } 00065 00066 G_GNUC_CONST 00067 static inline int16_t 00068 pcm_clamp_16(int x) 00069 { 00070 static const int32_t MIN_VALUE = G_MININT16; 00071 static const int32_t MAX_VALUE = G_MAXINT16; 00072 00073 if (G_UNLIKELY(x < MIN_VALUE)) 00074 return MIN_VALUE; 00075 if (G_UNLIKELY(x > MAX_VALUE)) 00076 return MAX_VALUE; 00077 return x; 00078 } 00079 00080 G_GNUC_CONST 00081 static inline int32_t 00082 pcm_clamp_24(int x) 00083 { 00084 static const int32_t MIN_VALUE = -(1 << 23); 00085 static const int32_t MAX_VALUE = (1 << 23) - 1; 00086 00087 if (G_UNLIKELY(x < MIN_VALUE)) 00088 return MIN_VALUE; 00089 if (G_UNLIKELY(x > MAX_VALUE)) 00090 return MAX_VALUE; 00091 return x; 00092 } 00093 00094 #endif