diff options
Diffstat (limited to 'src/PcmUtils.hxx')
| -rw-r--r-- | src/PcmUtils.hxx | 39 |
1 files changed, 24 insertions, 15 deletions
diff --git a/src/PcmUtils.hxx b/src/PcmUtils.hxx index a95af7e6..5683a167 100644 --- a/src/PcmUtils.hxx +++ b/src/PcmUtils.hxx @@ -22,6 +22,8 @@ #include "gcc.h" +#include <limits> + #include <stdint.h> /** @@ -64,32 +66,39 @@ pcm_range_64(int64_t sample, unsigned bits) return sample; } +template<typename T, typename U, unsigned bits> gcc_const -static inline int16_t -pcm_clamp_16(int x) +static inline T +PcmClamp(U x) { - static const int32_t MIN_VALUE = -(1 << 15); - static const int32_t MAX_VALUE = (1 << 15) - 1; + constexpr U MIN_VALUE = -(1 << (bits - 1)); + constexpr U MAX_VALUE = (1 << (bits - 1)) - 1; + + typedef std::numeric_limits<T> 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 MIN_VALUE; + return T(MIN_VALUE); + if (gcc_unlikely(x > MAX_VALUE)) - return MAX_VALUE; - return x; + return T(MAX_VALUE); + + return T(x); +} + +gcc_const +static inline int16_t +pcm_clamp_16(int x) +{ + return PcmClamp<int16_t, int, 16>(x); } gcc_const static inline int32_t pcm_clamp_24(int x) { - static const int32_t MIN_VALUE = -(1 << 23); - static const int32_t MAX_VALUE = (1 << 23) - 1; - - if (gcc_unlikely(x < MIN_VALUE)) - return MIN_VALUE; - if (gcc_unlikely(x > MAX_VALUE)) - return MAX_VALUE; - return x; + return PcmClamp<int32_t, int, 24>(x); } #endif |