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use super::audio_format::{self, linear_pcm_flags};
#[derive(Copy, Clone, Debug, PartialEq, Eq)]
pub enum SampleFormat {
F32,
I32,
I16,
I8,
}
impl SampleFormat {
pub fn does_match_flags(&self, flags: audio_format::LinearPCMFlags) -> bool {
let is_float = flags.contains(linear_pcm_flags::IS_FLOAT);
let is_signed_integer = flags.contains(linear_pcm_flags::IS_SIGNED_INTEGER);
match *self {
SampleFormat::F32 => is_float && !is_signed_integer,
SampleFormat::I32 |
SampleFormat::I16 |
SampleFormat::I8 => is_signed_integer && !is_float,
}
}
pub fn from_flags_and_bytes_per_frame(flags: audio_format::LinearPCMFlags,
bytes_per_frame: u32) -> Option<Self>
{
Some(if flags.contains(linear_pcm_flags::IS_FLOAT) {
SampleFormat::F32
} else {
match bytes_per_frame {
1 => SampleFormat::I8,
2 => SampleFormat::I16,
4 => SampleFormat::I32,
_ => return None,
}
})
}
pub fn size_in_bytes(&self) -> usize {
use std::mem::size_of;
match *self {
SampleFormat::F32 => size_of::<f32>(),
SampleFormat::I32 => size_of::<i32>(),
SampleFormat::I16 => size_of::<i16>(),
SampleFormat::I8 => size_of::<i8>(),
}
}
}
pub trait Sample {
fn sample_format() -> SampleFormat;
}
macro_rules! impl_sample {
($($T:ident $format:ident),* $(,)*) => {
$(
impl Sample for $T {
fn sample_format() -> SampleFormat {
SampleFormat::$format
}
}
)*
}
}
impl_sample!(f32 F32, i32 I32, i16 I16, i8 I8);