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Add conversion step in mp3 decoder

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This commit is contained in:
Pierre Krieger 2015-10-18 09:04:36 +02:00
parent 5e61989560
commit c46fbd83e4
1 changed files with 9 additions and 3 deletions
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12
src/decoder/mp3.rs
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@ -54,15 +54,21 @@ impl<R> Source for Mp3Decoder<R> where R: Read {
}
impl<R> Iterator for Mp3Decoder<R> where R: Read {
type Item = i16; // TODO: i32
type Item = i16;
#[inline]
fn next(&mut self) -> Option<i16> { // TODO: i32
fn next(&mut self) -> Option<i16> {
if self.current_frame.samples[0].len() == 0 {
return None;
}
let sample = (self.current_frame.samples[self.current_frame_channel][self.current_frame_sample_pos] / 0x10000) as i16;
// getting the sample and converting it from fixed step to i16
let sample = self.current_frame.samples[self.current_frame_channel][self.current_frame_sample_pos];
let sample = sample + (1 << (28 - 16));
let sample = if sample >= 0x10000000 { 0x10000000 - 1 } else if sample <= -0x10000000 { -0x10000000 } else { sample };
let sample = sample >> (28 + 1 - 16);
let sample = sample as i16;
self.current_frame_channel += 1;
if self.current_frame_channel < self.current_frame.samples.len() {