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PcmFormat: move definitions to struct SampleTraits

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This commit is contained in:
Max Kellermann 2013-10-28 21:29:36 +01:00
parent de1261ba28
commit 12e9b7eafa
1 changed files with 81 additions and 36 deletions
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117
src/pcm/PcmFormat.cxx
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@ -25,12 +25,47 @@
#include <type_traits>
template<typename S>
struct DefaultSampleBits {
typedef decltype(*S()) T;
typedef typename std::remove_reference<T>::type U;
template<SampleFormat F>
struct SampleTraits {};
static constexpr auto value = sizeof(U) * 8;
template<>
struct SampleTraits<SampleFormat::S8> {
typedef int8_t value_type;
typedef value_type *pointer_type;
typedef const value_type *const_pointer_type;
static constexpr size_t SAMPLE_SIZE = sizeof(value_type);
static constexpr unsigned BITS = sizeof(value_type) * 8;
};
template<>
struct SampleTraits<SampleFormat::S16> {
typedef int16_t value_type;
typedef value_type *pointer_type;
typedef const value_type *const_pointer_type;
static constexpr size_t SAMPLE_SIZE = sizeof(value_type);
static constexpr unsigned BITS = sizeof(value_type) * 8;
};
template<>
struct SampleTraits<SampleFormat::S32> {
typedef int32_t value_type;
typedef value_type *pointer_type;
typedef const value_type *const_pointer_type;
static constexpr size_t SAMPLE_SIZE = sizeof(value_type);
static constexpr unsigned BITS = sizeof(value_type) * 8;
};
template<>
struct SampleTraits<SampleFormat::S24_P32> {
typedef int32_t value_type;
typedef value_type *pointer_type;
typedef const value_type *const_pointer_type;
static constexpr size_t SAMPLE_SIZE = sizeof(value_type);
static constexpr unsigned BITS = 24;
};
static void
@ -55,30 +90,32 @@ pcm_convert_32_to_16(PcmDither &dither,
dither.Dither32To16(out, in, in_end);
}
template<typename S, unsigned bits=DefaultSampleBits<S>::value>
template<SampleFormat F, class Traits=SampleTraits<F>>
static void
ConvertFromFloat(S dest, const float *src, const float *end)
ConvertFromFloat(typename Traits::pointer_type dest,
const float *src, const float *end)
{
typedef decltype(*S()) T;
typedef typename std::remove_reference<T>::type U;
constexpr auto bits = Traits::BITS;
const float factor = 1 << (bits - 1);
while (src != end) {
int sample(*src++ * factor);
*dest++ = PcmClamp<U, int, bits>(sample);
*dest++ = PcmClamp<typename Traits::value_type, int, bits>(sample);
}
}
template<typename S, unsigned bits=DefaultSampleBits<S>::value>
template<SampleFormat F, class Traits=SampleTraits<F>>
static void
ConvertFromFloat(S dest, const float *src, size_t size)
ConvertFromFloat(typename Traits::pointer_type dest,
const float *src, size_t size)
{
ConvertFromFloat<S, bits>(dest, src, pcm_end_pointer(src, size));
ConvertFromFloat<F, Traits>(dest, src,
pcm_end_pointer(src, size));
}
template<typename S, unsigned bits=sizeof(S)*8>
static S *
template<SampleFormat F, class Traits=SampleTraits<F>>
static typename Traits::pointer_type
AllocateFromFloat(PcmBuffer &buffer, const float *src, size_t src_size,
size_t *dest_size_r)
{
@ -86,9 +123,9 @@ AllocateFromFloat(PcmBuffer &buffer, const float *src, size_t src_size,
assert(src_size % src_sample_size == 0);
const size_t num_samples = src_size / src_sample_size;
*dest_size_r = num_samples * sizeof(S);
S *dest = (S *)buffer.Get(*dest_size_r);
ConvertFromFloat<S *, bits>(dest, src, src_size);
*dest_size_r = num_samples * sizeof(typename Traits::value_type);
auto dest = (typename Traits::pointer_type)buffer.Get(*dest_size_r);
ConvertFromFloat<F, Traits>(dest, src, src_size);
return dest;
}
@ -136,7 +173,8 @@ pcm_allocate_float_to_16(PcmBuffer &buffer,
const float *src, size_t src_size,
size_t *dest_size_r)
{
return AllocateFromFloat<int16_t>(buffer, src, src_size, dest_size_r);
return AllocateFromFloat<SampleFormat::S16>(buffer, src, src_size,
dest_size_r);
}
const int16_t *
@ -240,8 +278,8 @@ pcm_allocate_float_to_24(PcmBuffer &buffer,
const float *src, size_t src_size,
size_t *dest_size_r)
{
return AllocateFromFloat<int32_t, 24>(buffer, src, src_size,
dest_size_r);
return AllocateFromFloat<SampleFormat::S24_P32>(buffer, src, src_size,
dest_size_r);
}
const int32_t *
@ -395,35 +433,39 @@ pcm_convert_to_32(PcmBuffer &buffer,
return NULL;
}
template<typename S, unsigned bits=DefaultSampleBits<S>::value>
template<SampleFormat F, class Traits=SampleTraits<F>>
static void
ConvertToFloat(float *dest, S src, S end)
ConvertToFloat(float *dest,
typename Traits::const_pointer_type src,
typename Traits::const_pointer_type end)
{
constexpr float factor = 0.5 / (1 << (bits - 2));
constexpr float factor = 0.5 / (1 << (Traits::BITS - 2));
while (src != end)
*dest++ = float(*src++) * factor;
}
template<typename S, unsigned bits=DefaultSampleBits<S>::value>
template<SampleFormat F, class Traits=SampleTraits<F>>
static void
ConvertToFloat(float *dest, S src, size_t size)
ConvertToFloat(float *dest,
typename Traits::const_pointer_type src, size_t size)
{
ConvertToFloat<S, bits>(dest, src, pcm_end_pointer(src, size));
ConvertToFloat<F, Traits>(dest, src, pcm_end_pointer(src, size));
}
template<typename S, unsigned bits=DefaultSampleBits<S>::value>
template<SampleFormat F, class Traits=SampleTraits<F>>
static float *
AllocateToFloat(PcmBuffer &buffer, S src, size_t src_size,
AllocateToFloat(PcmBuffer &buffer,
typename Traits::const_pointer_type src, size_t src_size,
size_t *dest_size_r)
{
constexpr size_t src_sample_size = sizeof(*S());
constexpr size_t src_sample_size = Traits::SAMPLE_SIZE;
assert(src_size % src_sample_size == 0);
const size_t num_samples = src_size / src_sample_size;
*dest_size_r = num_samples * sizeof(float);
float *dest = (float *)buffer.Get(*dest_size_r);
ConvertToFloat<S, bits>(dest, src, src_size);
ConvertToFloat<F, Traits>(dest, src, src_size);
return dest;
}
@ -432,7 +474,8 @@ pcm_allocate_8_to_float(PcmBuffer &buffer,
const int8_t *src, size_t src_size,
size_t *dest_size_r)
{
return AllocateToFloat(buffer, src, src_size, dest_size_r);
return AllocateToFloat<SampleFormat::S8>(buffer, src, src_size,
dest_size_r);
}
static float *
@ -440,7 +483,8 @@ pcm_allocate_16_to_float(PcmBuffer &buffer,
const int16_t *src, size_t src_size,
size_t *dest_size_r)
{
return AllocateToFloat(buffer, src, src_size, dest_size_r);
return AllocateToFloat<SampleFormat::S16>(buffer, src, src_size,
dest_size_r);
}
static float *
@ -448,8 +492,8 @@ pcm_allocate_24p32_to_float(PcmBuffer &buffer,
const int32_t *src, size_t src_size,
size_t *dest_size_r)
{
return AllocateToFloat<decltype(src), 24>
(buffer, src, src_size, dest_size_r);
return AllocateToFloat<SampleFormat::S24_P32>(buffer, src, src_size,
dest_size_r);
}
static float *
@ -457,7 +501,8 @@ pcm_allocate_32_to_float(PcmBuffer &buffer,
const int32_t *src, size_t src_size,
size_t *dest_size_r)
{
return AllocateToFloat(buffer, src, src_size, dest_size_r);
return AllocateToFloat<SampleFormat::S32>(buffer, src, src_size,
dest_size_r);
}
const float *