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|
//! Audio output in WAV format.
use nihav_core::io::byteio::*;
use nihav_core::frame::*;
use std::io::SeekFrom;
/// WAVE output writer.
pub struct WavWriter<'a> {
io: &'a mut ByteWriter<'a>,
data_pos: u64,
}
fn write_byte(wr: &mut ByteWriter, sample: u8) -> ByteIOResult<()> {
wr.write_byte(sample)
}
fn write_s16(wr: &mut ByteWriter, sample: i16) -> ByteIOResult<()> {
wr.write_u16le(sample as u16)
}
fn write_s32(wr: &mut ByteWriter, sample: i32) -> ByteIOResult<()> {
wr.write_u16le((sample >> 16) as u16)
}
fn write_f32(wr: &mut ByteWriter, sample: f32) -> ByteIOResult<()> {
let mut out = (sample * 32768.0) as i32;
if out < -32768 { out = -32768; }
if out > 32767 { out = 32767; }
if out < 0 { out += 65536; }
wr.write_u16le(out as u16)
}
macro_rules! write_data {
($wr:expr, $buf:expr, $write:ident) => ({
let len = $buf.get_length();
let ainfo = $buf.get_info();
let nch = ainfo.get_channels() as usize;
let mut offs: Vec<usize> = Vec::with_capacity(nch);
for ch in 0..nch { offs.push($buf.get_offset(ch)); }
let is_planar = $buf.get_step() == 1;
let data = $buf.get_data();
if is_planar {
for i in 0..len {
for ch in 0..nch {
let sample = data[offs[ch] + i];
$write($wr, sample)?;
}
}
} else {
for i in 0..len*nch {
let sample = data[i];
$write($wr, sample)?;
}
}
})
}
impl<'a> WavWriter<'a> {
/// Constructs a new `WavWriter` instance.
pub fn new(io: &'a mut ByteWriter<'a>) -> Self {
WavWriter { io, data_pos: 0 }
}
/// Writes audio format information to the file header.
///
/// This function should be called exactly once before writing actual audio data.
pub fn write_header(&mut self, ainfo: NAAudioInfo) -> ByteIOResult<()> {
let bits = ainfo.get_format().get_bits() as usize;
self.io.write_buf(b"RIFF")?;
self.io.write_u32le(0)?;
self.io.write_buf(b"WAVE")?;
self.io.write_buf(b"fmt ")?;
self.io.write_u32le(16)?;
self.io.write_u16le(0x0001)?; // PCM
self.io.write_u16le(u16::from(ainfo.get_channels()))?;
self.io.write_u32le(ainfo.get_sample_rate())?;
if bits < 16 {
self.io.write_u32le(u32::from(ainfo.get_channels()) * ainfo.get_sample_rate())?;
self.io.write_u16le(u16::from(ainfo.get_channels()))?; // block align
self.io.write_u16le(8)?;
} else {
self.io.write_u32le(2 * u32::from(ainfo.get_channels()) * ainfo.get_sample_rate())?;
self.io.write_u16le(u16::from(2 * ainfo.get_channels()))?; // block align
self.io.write_u16le(16)?;
}
self.io.write_buf(b"data")?;
self.io.write_u32le(0)?;
self.data_pos = self.io.tell();
Ok(())
}
/// Writes audio data.
pub fn write_frame(&mut self, abuf: NABufferType) -> ByteIOResult<()> {
match abuf {
NABufferType::AudioU8(ref buf) => {
write_data!(self.io, buf, write_byte);
}
NABufferType::AudioI16(ref buf) => {
write_data!(self.io, buf, write_s16);
}
NABufferType::AudioI32(ref buf) => {
write_data!(self.io, buf, write_s32);
}
NABufferType::AudioF32(ref buf) => {
write_data!(self.io, buf, write_f32);
}
NABufferType::AudioPacked(ref buf) => {
self.io.write_buf(buf.get_data().as_slice())?;
}
_ => {},
};
Ok(())
}
}
impl<'a> Drop for WavWriter<'a> {
#[allow(unused_variables)]
fn drop(&mut self) {
let size = self.io.tell();
if (self.data_pos > 0) && (size >= self.data_pos) {
let res = self.io.seek(SeekFrom::Start(4));
let res = self.io.write_u32le((size - 8) as u32);
let res = self.io.seek(SeekFrom::Start(self.data_pos - 4));
let res = self.io.write_u32le((size - self.data_pos) as u32);
}
}
}
|
