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pcm/Traits: add MIN and MAX

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Move from PcmClamp().
This commit is contained in:
Max Kellermann 2013-12-22 18:52:54 +01:00
parent 316a25dead
commit b43ec3d6f0
2 changed files with 28 additions and 9 deletions
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15
src/pcm/PcmUtils.hxx
View File

@ -51,19 +51,16 @@ static inline typename Traits::value_type
PcmClamp(typename Traits::long_type x)
{
typedef typename Traits::value_type T;
typedef typename Traits::long_type U;
constexpr U MIN_VALUE = -(U(1) << (Traits::BITS - 1));
constexpr U MAX_VALUE = (U(1) << (Traits::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");
static_assert(Traits::MIN >= limits::min(), "out of range");
static_assert(Traits::MAX <= limits::max(), "out of range");
if (gcc_unlikely(x < MIN_VALUE))
return T(MIN_VALUE);
if (gcc_unlikely(x < Traits::MIN))
return T(Traits::MIN);
if (gcc_unlikely(x > MAX_VALUE))
return T(MAX_VALUE);
if (gcc_unlikely(x > Traits::MAX))
return T(Traits::MAX);
return T(x);
}

22
src/pcm/Traits.hxx
View File

@ -74,6 +74,16 @@ struct SampleTraits<SampleFormat::S8> {
* not exist if this is not an integer sample format.
*/
static constexpr unsigned BITS = sizeof(value_type) * 8;
/**
* The minimum sample value.
*/
static constexpr value_type MIN = -(sum_type(1) << (BITS - 1));
/**
* The maximum sample value.
*/
static constexpr value_type MAX = (sum_type(1) << (BITS - 1)) - 1;
};
template<>
@ -87,6 +97,9 @@ struct SampleTraits<SampleFormat::S16> {
static constexpr size_t SAMPLE_SIZE = sizeof(value_type);
static constexpr unsigned BITS = sizeof(value_type) * 8;
static constexpr value_type MIN = -(sum_type(1) << (BITS - 1));
static constexpr value_type MAX = (sum_type(1) << (BITS - 1)) - 1;
};
template<>
@ -100,6 +113,9 @@ struct SampleTraits<SampleFormat::S32> {
static constexpr size_t SAMPLE_SIZE = sizeof(value_type);
static constexpr unsigned BITS = sizeof(value_type) * 8;
static constexpr value_type MIN = -(sum_type(1) << (BITS - 1));
static constexpr value_type MAX = (sum_type(1) << (BITS - 1)) - 1;
};
template<>
@ -113,6 +129,9 @@ struct SampleTraits<SampleFormat::S24_P32> {
static constexpr size_t SAMPLE_SIZE = sizeof(value_type);
static constexpr unsigned BITS = 24;
static constexpr value_type MIN = -(sum_type(1) << (BITS - 1));
static constexpr value_type MAX = (sum_type(1) << (BITS - 1)) - 1;
};
template<>
@ -125,6 +144,9 @@ struct SampleTraits<SampleFormat::FLOAT> {
typedef float long_type;
static constexpr size_t SAMPLE_SIZE = sizeof(value_type);
static constexpr value_type MIN = -1;
static constexpr value_type MAX = 1;
};
#endif