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use crate::parsing::{parse_chunks, Chunk, ChunkID}; use alloc::vec; use alloc::vec::Vec; use core::array::TryFromSliceError; use core::convert::TryInto; /// Error type for different parsing failures #[derive(Debug, Clone)] pub enum Error { /// Unknown or unsupported Chunk ID UnknownChunkID([u8; 4]), /// Failed parsing slice into specific bytes CantParseSliceInto(TryFromSliceError), /// Failed parsing chunk with given id CantParseChunk(ChunkID), /// no data chunk found in file NoRiffChunkFound, /// no data chunk found in file NoDataChunkFound, /// no fmt/header chunk found in file NoFmtChunkFound, /// unsupported bit depth UnsupportedBitDepth(u16), } /// Struct representing the header section of a .wav file /// /// for more information see [`here`] /// /// [`here`]: http://soundfile.sapp.org/doc/WaveFormat/ #[derive(Debug, Clone)] pub struct Header { /// sample rate, typical values are `44_100`, `48_000` or `96_000` pub sample_rate: u32, /// number of audio channels in the sample data, channels are interleaved pub num_channels: u16, /// bit depth for each sample, typical values are `16` or `24` pub bit_depth: u16, } impl Header { /// Create new [`Header`] instance from a slice of bytes /// /// # Examples /// /// ``` /// use wavv::Header; /// /// fn main() { /// let bytes = [ /// 0x01, 0x00, // audio format /// 0x01, 0x00, // num channels /// 0x44, 0xac, 0x00, 0x00, // sample rate /// 0x88, 0x58, 0x01, 0x00, // byte rate /// 0x04, 0x00, // block align /// 0x18, 0x00, // bits per sample /// ]; /// /// let header = Header::from_bytes(&bytes).unwrap(); /// /// assert_eq!(header.num_channels, 1); /// assert_eq!(header.bit_depth, 24); /// assert_eq!(header.sample_rate, 44_100); /// } /// ``` pub fn from_bytes(bytes: &[u8]) -> Result<Self, Error> { let num_channels = bytes[2..4] .try_into() .map_err(|e| Error::CantParseSliceInto(e)) .map(|b| u16::from_le_bytes(b))?; let sample_rate = bytes[4..8] .try_into() .map_err(|e| Error::CantParseSliceInto(e)) .map(|b| u32::from_le_bytes(b))?; let bit_depth = bytes[14..16] .try_into() .map_err(|e| Error::CantParseSliceInto(e)) .map(|b| u16::from_le_bytes(b))?; Ok(Header { num_channels, sample_rate, bit_depth, }) } } /// Enum to hold samples for different bit depth #[derive(Debug, PartialEq)] pub enum Samples { /// 8 bit audio BitDepth8(Vec<u8>), /// 16 bit audio BitDepth16(Vec<i16>), /// 24 bit audio BitDepth24(Vec<i32>), } impl Samples { /// Create new [`Samples`] instance from a slice of bytes /// this requires a [`Header`] instance to be passed to determine /// the sample size and channel data etc. /// /// # Examples /// /// ``` /// use wavv::{Header, Samples}; /// /// fn main() { /// let bytes = [ /// 0x01, 0x00, // audio format /// 0x01, 0x00, // num channels /// 0x44, 0xac, 0x00, 0x00, // sample rate /// 0x88, 0x58, 0x01, 0x00, // byte rate /// 0x04, 0x00, // block align /// 0x18, 0x00, // bits per sample /// ]; /// /// let header = Header::from_bytes(&bytes).unwrap(); /// /// assert_eq!(header.num_channels, 1); /// assert_eq!(header.bit_depth, 24); /// assert_eq!(header.sample_rate, 44_100); /// /// let bytes = [ /// 0x00, 0x00, 0x00, // sample 1 /// 0x00, 0x24, 0x17, // sample 2 /// 0x1e, 0xf3, 0x3c, // sample 3 /// 0x13, 0x3c, 0x14, // sample 4 /// ]; /// /// let samples = Samples::from_bytes(&header, &bytes).unwrap(); /// /// assert_eq!( /// samples, /// Samples::BitDepth24(vec![ /// 0x00000000, // sample 1 /// 0x17240000, // sample 2 /// 0x3cf31e00, // sample 3 /// 0x143c1300, // sample 4 /// ]) /// ) /// } /// ``` pub fn from_bytes(header: &Header, bytes: &[u8]) -> Result<Self, Error> { let mut samples = match header.bit_depth { 8 => Ok(Samples::BitDepth8(vec![])), 16 => Ok(Samples::BitDepth16(vec![])), 24 => Ok(Samples::BitDepth24(vec![])), _ => Err(Error::UnsupportedBitDepth(header.bit_depth)), }?; let num_bytes = (header.bit_depth / 8) as usize; let mut pos = 0; loop { if pos + num_bytes > bytes.len() { break; } let slice = &bytes[pos..pos + num_bytes]; match samples { Samples::BitDepth8(ref mut v) => { let sample = slice .try_into() .map_err(|e| Error::CantParseSliceInto(e)) .map(u8::from_le_bytes)?; v.push(sample) } Samples::BitDepth16(ref mut v) => { let sample = slice .try_into() .map_err(|e| Error::CantParseSliceInto(e)) .map(i16::from_le_bytes)?; v.push(sample) } Samples::BitDepth24(ref mut v) => { let sample = [0, slice[0], slice[1], slice[2]][0..4] .try_into() .map_err(|e| Error::CantParseSliceInto(e)) .map(i32::from_le_bytes)?; v.push(sample) } } pos += num_bytes; } Ok(samples) } } /// Struct representing a .wav file #[derive(Debug)] pub struct Wave { /// Contains data from the fmt chunk / header part of the file pub header: Header, /// Contains audio data as samples of a fixed bit depth pub data: Samples, /// Contains raw chunk data that is either unimplemented or unknown pub unknown_chunks: Option<Vec<Chunk>>, } impl Wave { /// Create new [`Wave`] instance from a slice of bytes /// /// # Examples /// /// ``` /// use std::fs; /// use std::path::Path; /// use wavv::Wave; /// /// fn main() { /// let bytes = fs::read(Path::new("./test_files/sine_mono_16_44100.wav")).unwrap(); /// let wave = Wave::from_bytes(&bytes).unwrap(); /// /// assert_eq!(wave.header.num_channels, 1); /// assert_eq!(wave.header.bit_depth, 16); /// assert_eq!(wave.header.sample_rate, 44_100); /// } /// ``` pub fn from_bytes(bytes: &[u8]) -> Result<Self, Error> { let (chunks, unknown_chunks) = parse_chunks(bytes)?; let mut data = Err(Error::NoDataChunkFound); let mut header = Err(Error::NoFmtChunkFound); for chunk in chunks { match chunk { Chunk::FMT(h) => header = Ok(h), Chunk::DATA(d) => data = Ok(d), // ignore unknown chunks Chunk::Unknown(_, _) => (), } } let wave = Wave { data: data?, header: header?, unknown_chunks, }; Ok(wave) } } #[cfg(test)] mod tests { #![allow(overflowing_literals)] use super::*; use alloc::vec; #[test] fn test_parse_wave_16_bit_stereo() { let bytes: [u8; 60] = [ 0x52, 0x49, 0x46, 0x46, // RIFF 0x34, 0x00, 0x00, 0x00, // chunk size 0x57, 0x41, 0x56, 0x45, // WAVE 0x66, 0x6d, 0x74, 0x20, // fmt_ 0x10, 0x00, 0x00, 0x00, // chunk size 0x01, 0x00, // audio format 0x02, 0x00, // num channels 0x22, 0x56, 0x00, 0x00, // sample rate 0x88, 0x58, 0x01, 0x00, // byte rate 0x04, 0x00, // block align 0x10, 0x00, // bits per sample 0x64, 0x61, 0x74, 0x61, // data 0x10, 0x00, 0x00, 0x00, // chunk size 0x00, 0x00, 0x00, 0x00, // sample 1 L+R 0x24, 0x17, 0x1e, 0xf3, // sample 2 L+R 0x3c, 0x13, 0x3c, 0x14, // sample 3 L+R 0x16, 0xf9, 0x18, 0xf9, // sample 4 L+R ]; let wave = Wave::from_bytes(&bytes).unwrap(); assert_eq!(wave.header.sample_rate, 22050); assert_eq!(wave.header.bit_depth, 16); assert_eq!(wave.header.num_channels, 2); assert_eq!( wave.data, Samples::BitDepth16(vec![ 0x0000, 0x0000, // sample 1 L+R 0x1724, 0xf31e, // sample 2 L+R 0x133c, 0x143c, // sample 3 L+R 0xf916, 0xf918, // sample 4 L+R ]) ); } #[test] fn test_parse_wave_24_bit_mono() { let bytes: [u8; 56] = [ 0x52, 0x49, 0x46, 0x46, // RIFF 0x30, 0x00, 0x00, 0x00, // chunk size 0x57, 0x41, 0x56, 0x45, // WAVE 0x66, 0x6d, 0x74, 0x20, // fmt_ 0x10, 0x00, 0x00, 0x00, // chunk size 0x01, 0x00, // audio format 0x01, 0x00, // num channels 0x44, 0xac, 0x00, 0x00, // sample rate 0x88, 0x58, 0x01, 0x00, // byte rate 0x04, 0x00, // block align 0x18, 0x00, // bits per sample 0x64, 0x61, 0x74, 0x61, // data 0x0c, 0x00, 0x00, 0x00, // chunk size 0x00, 0x00, 0x00, // sample 1 0x00, 0x24, 0x17, // sample 2 0x1e, 0xf3, 0x3c, // sample 3 0x13, 0x3c, 0x14, // sample 4 ]; let wave = Wave::from_bytes(&bytes).unwrap(); assert_eq!(wave.header.sample_rate, 44100); assert_eq!(wave.header.bit_depth, 24); assert_eq!(wave.header.num_channels, 1); assert_eq!( wave.data, Samples::BitDepth24(vec![ 0x00000000, // sample 1 0x17240000, // sample 2 0x3cf31e00, // sample 3 0x143c1300, // sample 4 ]) ); } }