wavetable/

wt_reader.rs

//! Reads wavetable files in WAV format.
//!
//! Currently WtReader only supports reading WAV files in float format,
//! containing the samples as 32-bit float values. Additionally each waveform
//! in the file must be 2048 samples long.
//!
//! For every 2048 samples, the reader will add an additional waveshape table
//! to the result. As read from disk, these tables will not be bandlimited,
//! and might therefore generate aliasing if used directly.

use super::{Wavetable, WavetableRef};
use super::Float;

use std::fs::File;
use std::io::{Read, BufReader};
use std::mem;

use log::{info, trace, warn};

#[repr(C, packed)]
#[derive(Debug, Copy, Clone)]
struct ChunkHeader {
    chunk_id: [u8; 4],
    size: u32
}

pub struct WtReader {
    pub base_path: String,
}

impl WtReader {
    /// Creates a new WtReader instance.
    ///
    /// The argument is a path to a directory that files will be read from.
    ///
    /// ```
    /// use wavetable::WtReader;
    ///
    /// let data_dir = "data".to_string();
    ///
    /// let reader = WtReader::new(&data_dir);
    /// ```
    pub fn new(path: &str) -> Self {
        let mut base_path = path.to_string();
        let path_bytes = base_path.as_bytes();
        if path_bytes[path_bytes.len() - 1] != b'/' {
            base_path.push('/');
        }
        WtReader{base_path: base_path}
    }

    /// Read a file with the given filename.
    ///
    /// The filename should not contain the full path of the file, but be
    /// relative to the base path set in the constructor.
    ///
    /// ``` norun
    /// use wavetable::WtReader;
    ///
    /// # fn main() -> Result<(), ()> {
    ///
    /// let reader = WtReader::new("data");
    /// let wavetable = reader.read_file("test")?;
    ///
    /// # Ok(())
    /// # }
    /// ```
    pub fn read_file(&self, filename: &str) -> Result<WavetableRef, ()> {
        if filename == "" {
            return Err(());
        }
        let filename = self.base_path.clone() + filename;
        let result = File::open(filename);
        if let Ok(file) = result {
            let reader = BufReader::new(file);
            WtReader::read_wavetable(reader, 2048)
        } else {
            Err(())
        }
    }

    /// Read a wavetable from the provided input stream.
    ///
    /// Source is any stream object implementing the Read trait.
    /// samples_per_table is the length of a single wave cycle, usually 2048.
    ///
    /// ``` norun
    /// use wavetable::WtReader;
    /// use std::io::BufReader;
    ///
    /// let reader = WtReader::new("data");
    /// let data: &[u8] = &[0x00]; // Some buffer with wave data
    /// let buffer = BufReader::new(data);
    /// let wavetable = WtReader::read_wavetable(buffer, 2048)?;
    /// ```
    pub fn read_wavetable<R: Read>(mut source: R, samples_per_table: usize) -> Result<WavetableRef, ()> {
        // Read RIFF header
        let result = WtReader::read_header(&mut source);
        match result {
            Ok(_header) => { WtReader::skip_chunk(&mut source, 4); }
            Err(()) => return Err(()),
        }
        // Read chunks
        loop {
            let result = WtReader::read_header(&mut source);
            match result {
                Ok(header) => {
                    unsafe { info!("Chunk ID: {:?}\nSize; {}", header.chunk_id, header.size) };
                    if header.chunk_id[0] == 'd' as u8
                    && header.chunk_id[1] == 'a' as u8
                    && header.chunk_id[2] == 't' as u8
                    && header.chunk_id[3] == 'a' as u8 {
                        // Found data section, create wavetable
                        let result = WtReader::read_samples(&mut source, header.size, samples_per_table);
                        let samples = if let Ok(s) = result { s } else { return Err(()) };
                        let num_tables = samples.len();
                        return Result::Ok(Wavetable::new_from_vector(num_tables, 1, samples_per_table, samples));
                    } else {
                        WtReader::skip_chunk(&mut source, header.size);
                    }
                }
                Err(()) => return Err(()),
            }
        }
    }

    // Read the header of the next WAV chunk from the input stream.
    fn read_header<R: Read>(source: &mut R) -> Result<ChunkHeader, ()> {
        let mut header: ChunkHeader = unsafe { mem::zeroed() };
        let header_size = mem::size_of::<ChunkHeader>();
        unsafe {
            let header_slize = std::slice::from_raw_parts_mut(&mut header as *mut _ as *mut u8, header_size);
            source.read_exact(header_slize).unwrap();
        }
        info!("\nRead structure: {:#?}", header);
        Ok(header)
    }

    // Skip over the rest of the current chunk to the next header.
    fn skip_chunk<R: Read>(source: &mut R, num_bytes: u32) {
        let mut buf: [u8; 1] = unsafe { mem::zeroed() };
        for _i in 0..num_bytes {
            source.read(&mut buf).unwrap();
        }
    }

    // Read samples into multiple tables.
    //
    // A file is assumed to hold multiple waveshapes, each with
    // <samples_per_table> values. One more value is added to the end of the
    // table automatically.
    //
    fn read_samples<R: Read>(source: &mut R, num_bytes: u32, samples_per_table: usize) -> Result<Vec<Vec<Float>>, ()> {
        let mut buf: f32 = unsafe { mem::zeroed() };
        let mut samples: Vec<Vec<Float>> = vec!{};
        let sample_size = mem::size_of::<f32>();
        let num_samples = num_bytes as usize / sample_size;
        let num_tables = num_samples / samples_per_table;
        if num_samples < samples_per_table || num_samples % samples_per_table != 0 {
            info!("Unexpected number of samples: {}", num_samples);
            return Err(());
        }
        info!("{} samples total, {} tables with {} values each", num_samples, num_tables, samples_per_table);
        for _i in 0..num_tables {
            samples.push(vec!(0.0; samples_per_table + 1));
        }
        unsafe {
            let sample = std::slice::from_raw_parts_mut(&mut buf as *mut _ as *mut u8, sample_size);
            for i in 0..num_tables {
                let table = &mut samples[i];
                for j in 0..samples_per_table {
                    source.read_exact(sample).unwrap();
                    table[j] = buf as Float;
                }
                table[samples_per_table] = table[0]; // Duplicate first entry as last entry for easy interpolation
                Wavetable::normalize(table);
            }
        }
        Ok(samples)
    }
}


// ----------------------------------------------
//                  Unit tests
// ----------------------------------------------

struct TestContext {
}

impl TestContext {
    pub fn new() -> Self {
        TestContext{}
    }

    pub fn test(&mut self, ptr: &[u8]) -> bool {
        let reader = BufReader::new(ptr);
        let result = WtReader::read_wavetable(reader, 512);
        match result {
            Ok(_) => true,
            Err(()) => false
        }
    }
}

#[test]
fn single_wave_can_be_read() {
    let mut context = TestContext::new();
    assert!(context.test(SINGLE_WAVE));
}

#[test]
fn partial_wave_is_rejected() {
    let mut context = TestContext::new();
    assert!(!context.test(PARTIAL_WAVE));
}

#[test]
fn base_path_is_set_up_correctly() {
    let wtr = WtReader::new("NoSlash");
    assert!(wtr.base_path == "NoSlash/".to_string());

    let wtr = WtReader::new("WithSlash/");
    assert!(wtr.base_path == "WithSlash/".to_string());
}

const PARTIAL_WAVE: &[u8] = &[
    // RIFF/ WAVE header
    'R' as u8, 'I' as u8, 'F' as u8, 'F' as u8,
    0x04, 0x00, 0x00, 0x00,
    'W' as u8, 'A' as u8, 'V' as u8, 'E' as u8,
    // Junk chunk
    'j' as u8, 'u' as u8, 'n' as u8, 'k' as u8,
    0x04, 0x00, 0x00, 0x00,
    0x00, 0x00, 0x00, 0x00,
    // TODO: fmt chunk
    // data chunk
    'd' as u8, 'a' as u8, 't' as u8, 'a' as u8,
    0x10, 0x00, 0x00, 0x00,
    0xa0, 0xc4, 0xb8, 0xba,
    0xa0, 0x54, 0xfc, 0x3a,
    0xf0, 0x0f, 0xaa, 0x3b,
    0x54, 0x2f, 0x0a, 0x3c,
];

const SINGLE_WAVE: &[u8] = &[
    'R' as u8, 'I' as u8, 'F' as u8, 'F' as u8,
    0x04, 0x00, 0x00, 0x00,
    'W' as u8, 'A' as u8, 'V' as u8, 'E' as u8,
    // Junk chunk
    'j' as u8, 'u' as u8, 'n' as u8, 'k' as u8,
    0x04, 0x00, 0x00, 0x00,
    0x00, 0x00, 0x00, 0x00,
    // TODO: fmt chunk
    // data chunk
    'd' as u8, 'a' as u8, 't' as u8, 'a' as u8,
    0x00, 0x08, 0x00, 0x00,
    0xa0, 0xc4, 0xb8, 0xba, 0xa0, 0x54, 0xfc, 0x3a,
    0xf0, 0x0f, 0xaa, 0x3b, 0x54, 0x2f, 0x0a, 0x3c, 0x9c, 0x35, 0x40, 0x3c, 0x48, 0x43, 0x76, 0x3c,
    0x2a, 0x33, 0x96, 0x3c, 0x18, 0xb3, 0xb1, 0x3c, 0x1c, 0x50, 0xcd, 0x3c, 0xc5, 0x82, 0xe8, 0x3c,
    0xa8, 0x39, 0x01, 0x3d, 0x33, 0xdc, 0x0d, 0x3d, 0x3e, 0x6d, 0x1a, 0x3d, 0x8e, 0x5e, 0x27, 0x3d,
    0x44, 0x7a, 0x34, 0x3d, 0x8b, 0x5b, 0x41, 0x3d, 0xb6, 0x98, 0x4d, 0x3d, 0x25, 0x41, 0x59, 0x3d,
    0x98, 0x12, 0x65, 0x3d, 0x3c, 0xb0, 0x71, 0x3d, 0x23, 0xf3, 0x7e, 0x3d, 0xef, 0xfa, 0x85, 0x3d,
    0x19, 0xda, 0x8b, 0x3d, 0x7c, 0x23, 0x91, 0x3d, 0xf7, 0x76, 0x96, 0x3d, 0x46, 0x6f, 0x9c, 0x3d,
    0xe8, 0xe9, 0xa2, 0x3d, 0x0e, 0x66, 0xa9, 0x3d, 0x0b, 0x3f, 0xaf, 0x3d, 0x3c, 0x83, 0xb4, 0x3d,
    0x4a, 0xa0, 0xb9, 0x3d, 0xb2, 0xf8, 0xbe, 0x3d, 0x1e, 0x5b, 0xc4, 0x3d, 0x74, 0xcf, 0xc9, 0x3d,
    0xfe, 0x6f, 0xcf, 0x3d, 0xfa, 0x29, 0xd5, 0x3d, 0x1c, 0xe7, 0xda, 0x3d, 0x8f, 0x6e, 0xe0, 0x3d,
    0x4b, 0x9f, 0xe5, 0x3d, 0x8c, 0xb4, 0xea, 0x3d, 0x21, 0xcd, 0xef, 0x3d, 0x52, 0xd5, 0xf4, 0x3d,
    0x38, 0xc8, 0xf9, 0x3d, 0xcd, 0xf7, 0xfe, 0x3d, 0x4e, 0x25, 0x02, 0x3e, 0xe2, 0xcc, 0x04, 0x3e,
    0x96, 0x64, 0x07, 0x3e, 0x3a, 0xc8, 0x09, 0x3e, 0x08, 0x1c, 0x0c, 0x3e, 0xab, 0x7e, 0x0e, 0x3e,
    0x7e, 0xf7, 0x10, 0x3e, 0xe8, 0x6f, 0x13, 0x3e, 0xde, 0xdb, 0x15, 0x3e, 0xf0, 0x3c, 0x18, 0x3e,
    0xdb, 0x81, 0x1a, 0x3e, 0x30, 0xcf, 0x1c, 0x3e, 0x28, 0x0c, 0x1f, 0x3e, 0x19, 0x41, 0x21, 0x3e,
    0x36, 0x81, 0x23, 0x3e, 0x5e, 0xd1, 0x25, 0x3e, 0xa8, 0x30, 0x28, 0x3e, 0xc1, 0x70, 0x2a, 0x3e,
    0x78, 0x95, 0x2c, 0x3e, 0x5b, 0xa2, 0x2e, 0x3e, 0x59, 0xa7, 0x30, 0x3e, 0x84, 0xc0, 0x32, 0x3e,
    0x8e, 0xd2, 0x34, 0x3e, 0x17, 0xf1, 0x36, 0x3e, 0x54, 0x0f, 0x39, 0x3e, 0xf8, 0x46, 0x3b, 0x3e,
    0x2b, 0x67, 0x3d, 0x3e, 0xb2, 0x64, 0x3f, 0x3e, 0xc8, 0x65, 0x41, 0x3e, 0xcf, 0x43, 0x43, 0x3e,
    0x78, 0x1c, 0x45, 0x3e, 0x48, 0xe7, 0x46, 0x3e, 0x08, 0xbb, 0x48, 0x3e, 0x09, 0xbf, 0x4a, 0x3e,
    0xbd, 0xf1, 0x4c, 0x3e, 0xb0, 0x19, 0x4f, 0x3e, 0xc2, 0xd4, 0x50, 0x3e, 0xec, 0x6b, 0x52, 0x3e,
    0x1a, 0xf4, 0x53, 0x3e, 0xde, 0xb0, 0x55, 0x3e, 0x16, 0xb0, 0x57, 0x3e, 0x88, 0xa3, 0x59, 0x3e,
    0x82, 0x7f, 0x5b, 0x3e, 0xb9, 0x45, 0x5d, 0x3e, 0xde, 0x09, 0x5f, 0x3e, 0x42, 0xae, 0x60, 0x3e,
    0x6f, 0x42, 0x62, 0x3e, 0xde, 0xdf, 0x63, 0x3e, 0xba, 0x78, 0x65, 0x3e, 0x81, 0x43, 0x67, 0x3e,
    0xa2, 0xfb, 0x68, 0x3e, 0xc6, 0xa0, 0x6a, 0x3e, 0x61, 0x25, 0x6c, 0x3e, 0x4d, 0x9e, 0x6d, 0x3e,
    0x64, 0x2c, 0x6f, 0x3e, 0xe9, 0xb6, 0x70, 0x3e, 0xae, 0x53, 0x72, 0x3e, 0x24, 0xe5, 0x73, 0x3e,
    0x78, 0x85, 0x75, 0x3e, 0x0a, 0x1a, 0x77, 0x3e, 0x96, 0x96, 0x78, 0x3e, 0x63, 0xfa, 0x79, 0x3e,
    0x88, 0x36, 0x7b, 0x3e, 0xf4, 0x96, 0x7c, 0x3e, 0xa9, 0xee, 0x7d, 0x3e, 0x3d, 0x48, 0x7f, 0x3e,
    0x3b, 0x5a, 0x80, 0x3e, 0xa0, 0x16, 0x81, 0x3e, 0x6f, 0xd1, 0x81, 0x3e, 0x05, 0x86, 0x82, 0x3e,
    0xa8, 0x33, 0x83, 0x3e, 0xa2, 0xcb, 0x83, 0x3e, 0x32, 0x6e, 0x84, 0x3e, 0xa1, 0x10, 0x85, 0x3e,
    0x8f, 0xa5, 0x85, 0x3e, 0x05, 0x47, 0x86, 0x3e, 0x63, 0xe6, 0x86, 0x3e, 0x74, 0x81, 0x87, 0x3e,
    0x91, 0x1c, 0x88, 0x3e, 0x80, 0xb9, 0x88, 0x3e, 0x18, 0x47, 0x89, 0x3e, 0xbc, 0xdd, 0x89, 0x3e,
    0xbf, 0x7c, 0x8a, 0x3e, 0xce, 0x12, 0x8b, 0x3e, 0xcb, 0xaf, 0x8b, 0x3e, 0xea, 0x46, 0x8c, 0x3e,
    0xec, 0xd7, 0x8c, 0x3e, 0x72, 0x63, 0x8d, 0x3e, 0xd1, 0xde, 0x8d, 0x3e, 0x10, 0x48, 0x8e, 0x3e,
    0xcd, 0xbb, 0x8e, 0x3e, 0x02, 0x53, 0x8f, 0x3e, 0x50, 0xfc, 0x8f, 0x3e, 0xb5, 0xa4, 0x90, 0x3e,
    0x10, 0x23, 0x91, 0x3e, 0xa9, 0x8a, 0x91, 0x3e, 0xb3, 0xf0, 0x91, 0x3e, 0x0a, 0x63, 0x92, 0x3e,
    0xf9, 0xe3, 0x92, 0x3e, 0x3b, 0x65, 0x93, 0x3e, 0x99, 0xdf, 0x93, 0x3e, 0x7a, 0x5c, 0x94, 0x3e,
    0x20, 0xd7, 0x94, 0x3e, 0xfa, 0x3b, 0x95, 0x3e, 0x42, 0x98, 0x95, 0x3e, 0x4c, 0xf7, 0x95, 0x3e,
    0x8a, 0x5a, 0x96, 0x3e, 0xfc, 0xd8, 0x96, 0x3e, 0x26, 0x57, 0x97, 0x3e, 0xf6, 0xc6, 0x97, 0x3e,
    0xc6, 0x37, 0x98, 0x3e, 0xc6, 0xa5, 0x98, 0x3e, 0x2c, 0x01, 0x99, 0x3e, 0x44, 0x59, 0x99, 0x3e,
    0x72, 0xb0, 0x99, 0x3e, 0x00, 0x04, 0x9a, 0x3e, 0xe2, 0x6a, 0x9a, 0x3e, 0x5a, 0xd2, 0x9a, 0x3e,
    0x90, 0x31, 0x9b, 0x3e, 0xe0, 0x97, 0x9b, 0x3e, 0x4a, 0xfb, 0x9b, 0x3e, 0xb3, 0x52, 0x9c, 0x3e,
    0xd1, 0xa3, 0x9c, 0x3e, 0x2b, 0xf3, 0x9c, 0x3e, 0xf4, 0x3b, 0x9d, 0x3e, 0xa8, 0x90, 0x9d, 0x3e,
    0x78, 0xe1, 0x9d, 0x3e, 0xab, 0x31, 0x9e, 0x3e, 0xd6, 0x86, 0x9e, 0x3e, 0x5a, 0xd8, 0x9e, 0x3e,
    0x10, 0x26, 0x9f, 0x3e, 0x74, 0x67, 0x9f, 0x3e, 0x46, 0xa5, 0x9f, 0x3e, 0x78, 0xe9, 0x9f, 0x3e,
    0xd8, 0x44, 0xa0, 0x3e, 0x6a, 0xa4, 0xa0, 0x3e, 0xbb, 0xf5, 0xa0, 0x3e, 0x08, 0x2a, 0xa1, 0x3e,
    0x02, 0x45, 0xa1, 0x3e, 0x25, 0x75, 0xa1, 0x3e, 0x13, 0xbf, 0xa1, 0x3e, 0x90, 0x18, 0xa2, 0x3e,
    0x39, 0x6f, 0xa2, 0x3e, 0x6c, 0xb5, 0xa2, 0x3e, 0xf6, 0xf1, 0xa2, 0x3e, 0xec, 0x26, 0xa3, 0x3e,
    0x45, 0x50, 0xa3, 0x3e, 0x44, 0x64, 0xa3, 0x3e, 0xdb, 0x8b, 0xa3, 0x3e, 0xc1, 0xd8, 0xa3, 0x3e,
    0x4c, 0x3d, 0xa4, 0x3e, 0x67, 0x99, 0xa4, 0x3e, 0x53, 0xbc, 0xa4, 0x3e, 0x1a, 0xbb, 0xa4, 0x3e,
    0x73, 0xb8, 0xa4, 0x3e, 0xe2, 0xd9, 0xa4, 0x3e, 0xc0, 0x08, 0xa5, 0x3e, 0x91, 0x41, 0xa5, 0x3e,
    0xe0, 0x81, 0xa5, 0x3e, 0x78, 0xc9, 0xa5, 0x3e, 0x7c, 0x0c, 0xa6, 0x3e, 0x78, 0x30, 0xa6, 0x3e,
    0xf8, 0x3a, 0xa6, 0x3e, 0x5d, 0x3f, 0xa6, 0x3e, 0xb1, 0x56, 0xa6, 0x3e, 0x36, 0x7c, 0xa6, 0x3e,
    0x86, 0xa1, 0xa6, 0x3e, 0x75, 0xcc, 0xa6, 0x3e, 0xf2, 0xf7, 0xa6, 0x3e, 0xeb, 0x22, 0xa7, 0x3e,
    0x1d, 0x45, 0xa7, 0x3e, 0xea, 0x61, 0xa7, 0x3e, 0x86, 0x78, 0xa7, 0x3e, 0x48, 0x91, 0xa7, 0x3e,
    0xac, 0xae, 0xa7, 0x3e, 0xde, 0xc6, 0xa7, 0x3e, 0xb3, 0xdf, 0xa7, 0x3e, 0x22, 0xf7, 0xa7, 0x3e,
    0xf1, 0x0a, 0xa8, 0x3e, 0x84, 0x1c, 0xa8, 0x3e, 0x61, 0x29, 0xa8, 0x3e, 0x2c, 0x35, 0xa8, 0x3e,
    0x92, 0x43, 0xa8, 0x3e, 0x42, 0x5c, 0xa8, 0x3e, 0x09, 0x74, 0xa8, 0x3e, 0x70, 0x8c, 0xa8, 0x3e,
    0x00, 0xa5, 0xa8, 0x3e, 0x2c, 0xbc, 0xa8, 0x3e, 0x6c, 0xc9, 0xa8, 0x3e, 0xde, 0xc3, 0xa8, 0x3e,
    0xed, 0xb8, 0xa8, 0x3e, 0x3d, 0xb9, 0xa8, 0x3e, 0x78, 0xd2, 0xa8, 0x3e, 0x54, 0xf6, 0xa8, 0x3e,
    0xea, 0x10, 0xa9, 0x3e, 0x56, 0x19, 0xa9, 0x3e, 0x2e, 0x19, 0xa9, 0x3e, 0x75, 0x19, 0xa9, 0x3e,
    0xb6, 0x17, 0xa9, 0x3e, 0x2a, 0x18, 0xa9, 0x3e, 0x86, 0x18, 0xa9, 0x3e, 0x3e, 0x1d, 0xa9, 0x3e,
    0x9c, 0x24, 0xa9, 0x3e, 0x3e, 0x29, 0xa9, 0x3e, 0xf7, 0x23, 0xa9, 0x3e, 0x88, 0x1a, 0xa9, 0x3e,
    0x43, 0x12, 0xa9, 0x3e, 0xfc, 0x0c, 0xa9, 0x3e, 0xfe, 0x0a, 0xa9, 0x3e, 0x86, 0x09, 0xa9, 0x3e,
    0x86, 0x07, 0xa9, 0x3e, 0x48, 0x07, 0xa9, 0x3e, 0x60, 0x03, 0xa9, 0x3e, 0x22, 0xf6, 0xa8, 0x3e,
    0x12, 0xe0, 0xa8, 0x3e, 0xc6, 0xcd, 0xa8, 0x3e, 0x02, 0xc4, 0xa8, 0x3e, 0x2a, 0xc5, 0xa8, 0x3e,
    0x68, 0xc3, 0xa8, 0x3e, 0x48, 0xb8, 0xa8, 0x3e, 0xbe, 0xa3, 0xa8, 0x3e, 0x86, 0x8f, 0xa8, 0x3e,
    0xe4, 0x82, 0xa8, 0x3e, 0x6e, 0x7b, 0xa8, 0x3e, 0x0e, 0x76, 0xa8, 0x3e, 0x48, 0x6a, 0xa8, 0x3e,
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