src/wavwriter.rs

   1 extern crate nihav_core;
   2
   3 use nihav_core::io::byteio::*;
   4 use nihav_core::frame::*;
   5 use std::fs::File;
   6 use std::io::SeekFrom;
   7
   8 pub struct WavWriter<'a> {
   9     io: Box<ByteWriter<'a>>,
  10     data_pos: u64,
  11     be: bool,
  12     bits: u8,
  13 }
  14
  15 fn write_byte(wr: &mut ByteWriter, sample: u8) -> ByteIOResult<()> {
  16     wr.write_byte(sample)
  17 }
  18
  19 fn write_s16(wr: &mut ByteWriter, sample: i16) -> ByteIOResult<()> {
  20     wr.write_u16le(sample as u16)
  21 }
  22
  23 fn write_s32(wr: &mut ByteWriter, sample: i32) -> ByteIOResult<()> {
  24     wr.write_u16le((sample >> 16) as u16)
  25 }
  26
  27 fn write_f32(wr: &mut ByteWriter, sample: f32) -> ByteIOResult<()> {
  28     let mut out = (sample * 32768.0) as i32;
  29     if out < -32768 { out = -32768; }
  30     if out >  32767 { out =  32767; }
  31     if out < 0 { out += 65536; }
  32     wr.write_u16le(out as u16)
  33 }
  34
  35 macro_rules! write_data {
  36     ($wr:expr, $buf:expr, $write:ident) => ({
  37         let len = $buf.get_length();
  38         let ainfo = $buf.get_info();
  39         let nch = ainfo.get_channels() as usize;
  40         let mut offs: Vec<usize> = Vec::with_capacity(nch);
  41         for ch in 0..nch { offs.push($buf.get_offset(ch)); }
  42         let is_planar = $buf.get_step() == 1;
  43         let data = $buf.get_data();
  44
  45         if is_planar {
  46             for i in 0..len {
  47                 for ch in 0..nch {
  48                     let sample = data[offs[ch] + i];
  49                     $write($wr, sample)?;
  50                 }
  51             }
  52         } else {
  53             for i in 0..len*nch {
  54                 let sample = data[i];
  55                 $write($wr, sample)?;
  56             }
  57         }
  58     })
  59 }
  60
  61 impl<'a> WavWriter<'a> {
  62     pub fn new(name: &str) -> Self {
  63         let file = File::create(name).unwrap();
  64         let file = std::io::BufWriter::new(file);
  65         let fw   = Box::new(FileWriter::new_write(file));
  66         let io   = ByteWriter::new(Box::leak(fw));
  67         WavWriter { io: Box::new(io), data_pos: 0, be: false, bits: 0 }
  68     }
  69     pub fn write_header(&mut self, ainfo: NAAudioInfo) -> ByteIOResult<()> {
  70         let bits = ainfo.get_format().get_bits() as usize;
  71
  72         self.io.write_buf(b"RIFF")?;
  73         self.io.write_u32le(0)?;
  74         self.io.write_buf(b"WAVE")?;
  75
  76         self.io.write_buf(b"fmt ")?;
  77         self.io.write_u32le(16)?;
  78         self.io.write_u16le(0x0001)?; // PCM
  79         self.io.write_u16le(ainfo.get_channels() as u16)?;
  80         self.io.write_u32le(ainfo.get_sample_rate() as u32)?;
  81
  82         if bits < 16 {
  83             self.io.write_u32le((ainfo.get_channels() as u32) * (ainfo.get_sample_rate() as u32))?;
  84             self.io.write_u16le(ainfo.get_channels() as u16)?; // block align
  85             self.io.write_u16le(8)?;
  86         } else {
  87             self.io.write_u32le(2 * (ainfo.get_channels() as u32) * (ainfo.get_sample_rate() as u32))?;
  88             self.io.write_u16le((2 * ainfo.get_channels()) as u16)?; // block align
  89             self.io.write_u16le(16)?;
  90         }
  91
  92         self.io.write_buf(b"data")?;
  93         self.io.write_u32le(0)?;
  94
  95         self.bits = bits as u8;
  96         self.be = ainfo.get_format().is_be();
  97         self.data_pos = self.io.tell();
  98         Ok(())
  99     }
 100     pub fn write_frame(&mut self, abuf: NABufferType) -> ByteIOResult<()> {
 101         match abuf {
 102             NABufferType::AudioU8(ref buf) => {
 103                 write_data!(&mut self.io, buf, write_byte);
 104             }
 105             NABufferType::AudioI16(ref buf) => {
 106                 write_data!(&mut self.io, buf, write_s16);
 107             }
 108             NABufferType::AudioI32(ref buf) => {
 109                 write_data!(&mut self.io, buf, write_s32);
 110             }
 111             NABufferType::AudioF32(ref buf) => {
 112                 write_data!(&mut self.io, buf, write_f32);
 113             }
 114             NABufferType::AudioPacked(ref buf) => {
 115                 if !self.be || self.bits == 8 {
 116                     self.io.write_buf(buf.get_data().as_slice())?;
 117                 } else {
 118                     let data = buf.get_data();
 119                     match self.bits {
 120                         16 => {
 121                             for samp in data.chunks(2) {
 122                                 self.io.write_byte(samp[1])?;
 123                                 self.io.write_byte(samp[0])?;
 124                             }
 125                         },
 126                         24 => {
 127                             for samp in data.chunks(3) {
 128                                 self.io.write_byte(samp[2])?;
 129                                 self.io.write_byte(samp[1])?;
 130                                 self.io.write_byte(samp[0])?;
 131                             }
 132                         },
 133                         32 => {
 134                             for samp in data.chunks(4) {
 135                                 self.io.write_byte(samp[3])?;
 136                                 self.io.write_byte(samp[2])?;
 137                                 self.io.write_byte(samp[1])?;
 138                                 self.io.write_byte(samp[0])?;
 139                             }
 140                         },
 141                         _ => unimplemented!(),
 142                     };
 143                 }
 144             }
 145             _ => {},
 146         };
 147         Ok(())
 148     }
 149 }
 150
 151 impl<'a> Drop for WavWriter<'a> {
 152     #[allow(unused_variables)]
 153     fn drop(&mut self) {
 154         let size = self.io.tell();
 155         if (self.data_pos > 0) && (size >= self.data_pos) {
 156             let res = self.io.seek(SeekFrom::Start(4));
 157             let res = self.io.write_u32le((size - 8) as u32);
 158             let res = self.io.seek(SeekFrom::Start(self.data_pos - 4));
 159             let res = self.io.write_u32le(((size as u64) - self.data_pos) as u32);
 160         }
 161     }
 162 }