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use crate::backend::errors::Error;
pub fn get<T: Copy>(v: &[T], frame: usize, channel_idx: usize, num_channels: usize) -> T {
v[frame * num_channels + channel_idx]
}
pub fn validate_args(
input_frame_rate_hz: u32,
output_frame_rate_hz: u32,
num_channels: u32,
) -> Result<(), Error> {
if input_frame_rate_hz == 0 || output_frame_rate_hz == 0 {
return Err(Error::WrongFrameRate(
input_frame_rate_hz,
output_frame_rate_hz,
));
}
if num_channels == 0 {
return Err(Error::ResamplingError);
}
if (input_frame_rate_hz > output_frame_rate_hz)
&& (input_frame_rate_hz as f64 / output_frame_rate_hz as f64 > 256.0)
{
return Err(Error::WrongFrameRateRatio(
input_frame_rate_hz,
output_frame_rate_hz,
));
}
if output_frame_rate_hz as f64 / input_frame_rate_hz as f64 > 256.0 {
return Err(Error::WrongFrameRateRatio(
input_frame_rate_hz,
output_frame_rate_hz,
));
}
Ok(())
}
pub fn get_num_output_frames(
input_audio: &[f32],
input_frame_rate_hz: u32,
output_frame_rate_hz: u32,
num_channels: u32,
) -> usize {
((input_audio.len() as f64 * output_frame_rate_hz as f64 / input_frame_rate_hz as f64).ceil()
/ num_channels as f64)
.ceil() as usize
}