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extern crate memmap; extern crate byteorder; use std::io::{self,Seek,SeekFrom,Cursor}; use std::fmt::{self,Display}; use std::error::{self}; use memmap::{Mmap,Protection}; use byteorder::{LittleEndian, ReadBytesExt}; const RIFF : u32 = 0x46464952; const WAVE : u32 = 0x45564157; const FMT_ : u32 = 0x20746d66; const DATA : u32 = 0x61746164; const LIST : u32 = 0x5453494c; const FACT : u32 = 0x74636166; const FORMAT_PCM : u16 = 1; const FORMAT_IEEE : u16 = 3; const FORMAT_EXT : u16 = 0xfffe; #[derive(Debug,Copy,Clone,PartialEq)] pub enum Format { PCM = FORMAT_PCM as isize, IEEEFloat = FORMAT_IEEE as isize, Extended = FORMAT_EXT as isize } #[derive(Debug)] pub enum WaveError { IoError(io::Error), Unsupported(String), ParseError(String) } #[derive(Debug,Copy,Clone)] pub struct WaveInfo { pub audio_format: Format, pub channels: u16, pub sample_rate: u32, pub byte_rate: u32, pub block_align: u16, pub bits_per_sample: u16, pub total_frames: u32, pub valid_bps: Option<u16>, pub channel_mask: Option<u32>, pub subformat: Option<Format> } pub struct WaveFile { mmap: Mmap, data_offset: usize, data_size: usize, pub info: WaveInfo } pub struct WaveFileIterator<'a> { file: &'a WaveFile, pos: usize, base: usize, end: usize, bytes_per_sample: usize, } #[derive(Debug,PartialEq)] pub enum Frame { Mono(i32), Stereo(i32, i32), Multi(Vec<i32>) } impl From<io::Error> for WaveError { fn from(e: io::Error) -> Self { WaveError::IoError(e) } } impl From<byteorder::Error> for WaveError { fn from(e: byteorder::Error) -> Self { match e { byteorder::Error::UnexpectedEOF => WaveError::ParseError("Unexpected EOF".into()), byteorder::Error::Io(e) => WaveError::IoError(e) } } } impl WaveFile { pub fn open<S: Into<String>>(path: S) -> Result<WaveFile, WaveError> { let filename = path.into(); let mmap = try!(Mmap::open_path(filename, Protection::Read)); let info = WaveInfo { audio_format: Format::PCM, channels: 0, sample_rate: 0, byte_rate: 0, block_align: 0, bits_per_sample: 0, total_frames: 0, valid_bps: None, channel_mask: None, subformat: None }; let mut file = WaveFile { mmap: mmap, data_offset: 0, data_size: 0, info: info }; try!(file.read_header_chunks()); Ok(file) } pub fn iter(&self) -> WaveFileIterator { let bytes_per_sample = self.info.bits_per_sample as usize / 8; WaveFileIterator { file: &self, pos: 0, base: self.data_offset, end: self.data_offset + self.data_size, bytes_per_sample: bytes_per_sample } } fn read_header_chunks(&mut self) -> Result<(), WaveError> { let mut cursor = Cursor::new(unsafe { self.mmap.as_slice() } ); let mut have_fmt = false; let mut chunk_id = try!(cursor.read_u32::<LittleEndian>()); let mut chunk_size : u32; try!(cursor.read_u32::<LittleEndian>()); let riff_type = try!(cursor.read_u32::<LittleEndian>()); if chunk_id != RIFF || riff_type != WAVE { return Err(WaveError::ParseError("Not a Wavefile".into())); } loop { chunk_id = try!(cursor.read_u32::<LittleEndian>()); chunk_size = try!(cursor.read_u32::<LittleEndian>()); match chunk_id { FMT_ => { have_fmt = true; self.info.audio_format = match try!(cursor.read_u16::<LittleEndian>()) { FORMAT_PCM => Format::PCM, FORMAT_IEEE => Format::IEEEFloat, FORMAT_EXT => Format::Extended, other => { let msg = format!("Unexpected format {0:x}", other); return Err(WaveError::ParseError(msg)); } }; self.info.channels = try!(cursor.read_u16::<LittleEndian>()); self.info.sample_rate = try!(cursor.read_u32::<LittleEndian>()); self.info.byte_rate = try!(cursor.read_u32::<LittleEndian>()); self.info.block_align = try!(cursor.read_u16::<LittleEndian>()); self.info.bits_per_sample = try!(cursor.read_u16::<LittleEndian>()); if self.info.audio_format == Format::Extended { match try!(cursor.read_u16::<LittleEndian>()) { 0 => { }, 22 => { self.info.valid_bps = Some(try!(cursor.read_u16::<LittleEndian>())); self.info.channel_mask = Some(try!(cursor.read_u32::<LittleEndian>())); self.info.subformat = match try!(cursor.read_u16::<LittleEndian>()) { FORMAT_PCM => Some(Format::PCM), FORMAT_IEEE => Some(Format::IEEEFloat), other => { let msg = format!("Unexpected subformat {0:x}", other); return Err(WaveError::ParseError(msg)); } }; try!(cursor.seek(SeekFrom::Current(14))); }, x => { let msg = format!("Unexpected extension size: {}", x); return Err(WaveError::ParseError(msg)); } } } }, DATA => { self.data_size = chunk_size as usize; break; }, LIST => { try!(cursor.seek(SeekFrom::Current(chunk_size as i64))); }, FACT => { try!(cursor.seek(SeekFrom::Current(chunk_size as i64))); }, other => { let msg = format!("Unexpected Chunk ID {0:x}", other); return Err(WaveError::ParseError(msg)); } } } if !have_fmt { return Err(WaveError::ParseError("Format Chunk not found".into())); } if self.info.audio_format == Format::IEEEFloat { return Err(WaveError::Unsupported("IEEE Float format not implemented".into())); } if self.info.audio_format == Format::Extended && self.info.subformat != Some(Format::PCM) { return Err(WaveError::Unsupported("Only PCM data is supported for Ext Wave".into())); } if self.info.channels == 0 || self.info.bits_per_sample < 8 { let msg = format!("Invalid channel count {} or bits per sample {} value", self.info.channels, self.info.bits_per_sample); return Err(WaveError::ParseError(msg)); } self.info.total_frames = self.data_size as u32 / (self.info.channels as u32 * self.info.bits_per_sample as u32 / 8 ); self.data_offset = cursor.position() as usize; Ok(()) } } impl<'a> Iterator for WaveFileIterator<'a> { type Item = Frame; fn next(&mut self) -> Option<Self::Item> { let mut cursor = Cursor::new(unsafe { self.file.mmap.as_slice() }); let info = self.file.info; if let Err(_) = cursor.seek(SeekFrom::Start((self.base + self.pos) as u64)) { return None; }; if cursor.position() as usize == self.end { return None; } let mut samples : Vec<i32> = Vec::with_capacity(info.channels as usize); for _ in 0..info.channels { match cursor.read_int::<LittleEndian>(self.bytes_per_sample) { Ok(sample) => samples.push(sample as i32), Err(e) => { panic!("{:?}", e); } } } self.pos = cursor.position() as usize - self.base; match info.channels { 0 => unreachable!(), 1 => Some(Frame::Mono(samples[0])), 2 => Some(Frame::Stereo(samples[0], samples[1])), _ => Some(Frame::Multi(samples)) } } } impl error::Error for WaveError { fn description(&self) -> &str { match self { &WaveError::ParseError(ref s) => &s, &WaveError::Unsupported(ref s) => &s, &WaveError::IoError(ref e) => e.description() } } fn cause(&self) -> Option<&error::Error> { match self { &WaveError::IoError(ref e) => Some(e), _ => None } } } impl Display for WaveError { fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result { match self { &WaveError::IoError(ref e) => write!(f, "IO Error: {}", e), &WaveError::ParseError(ref s) => write!(f, "Parse Error: {}", s), &WaveError::Unsupported(ref s) => write!(f, "Unsupported Format Error: {}", s) } } } #[test] fn test_info() { let file = match WaveFile::open("./fixtures/test-s24le.wav") { Ok(f) => f, Err(e) => panic!("Error: {:?}", e) }; assert_eq!(file.info.audio_format, Format::PCM); assert_eq!(file.info.channels, 2); assert_eq!(file.info.sample_rate, 48000); assert_eq!(file.info.byte_rate, 288000); assert_eq!(file.info.block_align, 6); assert_eq!(file.info.bits_per_sample, 24); assert_eq!(file.info.total_frames, 501888); let file = match WaveFile::open("./fixtures/test-u8.wav") { Ok(f) => f, Err(e) => panic!("Error: {:?}", e) }; assert_eq!(file.info.audio_format, Format::PCM); assert_eq!(file.info.channels, 2); assert_eq!(file.info.sample_rate, 48000); assert_eq!(file.info.byte_rate, 96000); assert_eq!(file.info.bits_per_sample, 8); assert_eq!(file.info.block_align, 2); assert_eq!(file.info.total_frames, 501888); } #[test] fn test_iter() { let file = match WaveFile::open("./fixtures/test-s24le.wav") { Ok(f) => f, Err(e) => panic!("Error: {:?}", e) }; let frames = file.iter().take(2).collect::<Vec<_>>(); let expected = vec![ Frame::Stereo(19581, 19581), Frame::Stereo(24337, 24337) ]; for i in 0..expected.len() { assert_eq!(frames[i], expected[i]); } } #[test] fn test_formats() { if let Err(e) = WaveFile::open("./fixtures/test-f32le.wav") { match e { WaveError::Unsupported(_) => true, _ => panic!("Unexpected error (expected Unsupported)") }; } else { panic!("Unsupported format returned OK?"); } }