/* * Copyright (C) 2003-2011 The Music Player Daemon Project * http://www.musicpd.org * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License along * with this program; if not, write to the Free Software Foundation, Inc., * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. */ #ifndef MPD_PCM_UTILS_H #define MPD_PCM_UTILS_H #include "gcc.h" #include #include /** * Add a byte count to the specified pointer. This is a utility * function to convert a source pointer and a byte count to an "end" * pointer for use in loops. */ template static inline const T * pcm_end_pointer(const T *p, size_t size) { return (const T *)((const uint8_t *)p + size); } /** * Check if the value is within the range of the provided bit size, * and caps it if necessary. */ static inline int32_t pcm_range(int32_t sample, unsigned bits) { if (gcc_unlikely(sample < (-1 << (bits - 1)))) return -1 << (bits - 1); if (gcc_unlikely(sample >= (1 << (bits - 1)))) return (1 << (bits - 1)) - 1; return sample; } /** * Check if the value is within the range of the provided bit size, * and caps it if necessary. */ static inline int64_t pcm_range_64(int64_t sample, unsigned bits) { if (gcc_unlikely(sample < ((int64_t)-1 << (bits - 1)))) return (int64_t)-1 << (bits - 1); if (gcc_unlikely(sample >= ((int64_t)1 << (bits - 1)))) return ((int64_t)1 << (bits - 1)) - 1; return sample; } template gcc_const static inline T PcmClamp(U x) { constexpr U MIN_VALUE = -(U(1) << (bits - 1)); constexpr U MAX_VALUE = (U(1) << (bits - 1)) - 1; typedef std::numeric_limits limits; static_assert(MIN_VALUE >= limits::min(), "out of range"); static_assert(MAX_VALUE <= limits::max(), "out of range"); if (gcc_unlikely(x < MIN_VALUE)) return T(MIN_VALUE); if (gcc_unlikely(x > MAX_VALUE)) return T(MAX_VALUE); return T(x); } #endif