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pcm/Traits: add typedef "sum_type"

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Allow 32 bit platforms to use 32 bit instead of 64 bit for summing 24
bit samples.
This commit is contained in:
Max Kellermann
2013-12-02 11:45:03 +01:00
parent f761d583b5
commit c6ef0e8887
3 changed files with 16 additions and 5 deletions
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11
src/pcm/Traits.hxx
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@@ -50,6 +50,13 @@ struct SampleTraits<SampleFormat::S8> {
*/
typedef const value_type *const_pointer_type;
/**
* A "long" type that is large and accurate enough for adding
* two values without risking an (integer) overflow or
* (floating point) precision loss.
*/
typedef int sum_type;
/**
* A "long" type that is large and accurate enough for
* arithmetic without risking an (integer) overflow or
@@ -75,6 +82,7 @@ struct SampleTraits<SampleFormat::S16> {
typedef value_type *pointer_type;
typedef const value_type *const_pointer_type;
typedef int_least32_t sum_type;
typedef int_least32_t long_type;
static constexpr size_t SAMPLE_SIZE = sizeof(value_type);
@@ -87,6 +95,7 @@ struct SampleTraits<SampleFormat::S32> {
typedef value_type *pointer_type;
typedef const value_type *const_pointer_type;
typedef int_least64_t sum_type;
typedef int_least64_t long_type;
static constexpr size_t SAMPLE_SIZE = sizeof(value_type);
@@ -99,6 +108,7 @@ struct SampleTraits<SampleFormat::S24_P32> {
typedef value_type *pointer_type;
typedef const value_type *const_pointer_type;
typedef int_least32_t sum_type;
typedef int_least64_t long_type;
static constexpr size_t SAMPLE_SIZE = sizeof(value_type);
@@ -111,6 +121,7 @@ struct SampleTraits<SampleFormat::FLOAT> {
typedef value_type *pointer_type;
typedef const value_type *const_pointer_type;
typedef float sum_type;
typedef float long_type;
static constexpr size_t SAMPLE_SIZE = sizeof(value_type);