view src/lib/signal/filesource.rs @ 24:daa09aecdc40 default tip

lib: rename phase_shift to sample_shift Instead of tracking the phase shift in signals, we should track the sample shift (i.e., delay) of the signal. The sample shift is a constant regardless of the frequency - unlike phase shift. This simplifies the tracking considerably.
author Josef 'Jeff' Sipek <jeffpc@josefsipek.net>
date Thu, 15 Apr 2021 22:26:06 -0400
parents 2d5ae243921c
children
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/*
 * Copyright (c) 2020-2021 Josef 'Jeff' Sipek <jeffpc@josefsipek.net>
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */

use std::ops::Mul;

use std::io::BufRead;
use std::marker::PhantomData;

use crate::{IQSample, Scalar};
use crate::fmt::SignalFormatter;
use super::Signal;
use super::{Gain, Mixer};

pub struct FileSourceSignal<T: BufRead, U: SignalFormatter> {
    file: T,
    rate: u64,
    freq: u64,
    buf: Vec<u8>,
    phantom: PhantomData<U>
}

impl<T: BufRead, U: SignalFormatter> FileSourceSignal<T, U> {
    pub fn new(file: T, rate: u64, freq: u64) -> FileSourceSignal<T, U> {
        FileSourceSignal {
            file: file,
            rate: rate,
            freq: freq,
            buf: vec![ 0u8; U::sample_size() ],
            phantom: PhantomData
        }
    }
}

impl<T: BufRead, U: SignalFormatter> Signal for FileSourceSignal<T, U> {
    fn sample_rate(&self) -> u64 {
        self.rate
    }

    fn sample_size(&self) -> usize {
        U::sample_size()
    }

    fn sample_shift(&self) -> u64 {
        0
    }

    fn freq(&self) -> u64 {
        self.freq
    }
}

impl<T: BufRead, U: SignalFormatter> Iterator for FileSourceSignal<T, U> {
    type Item = IQSample;

    fn next(&mut self) -> Option<Self::Item> {
        self.file.read_exact(&mut self.buf).ok().map(|_v| U::raw_to_iqsample(&self.buf))
    }
}

include!("math.rs");
signal_math!(FileSourceSignal<BufRead, SignalFormatter>);