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|
use nihav_core::frame::*;
use nihav_core::soundcvt::*;
struct AudioQueue<T> {
start: usize,
end: usize,
stride: usize,
channels: usize,
data: Vec<T>,
ileaved: bool,
}
impl<T:Clone+Copy+From<u8>> AudioQueue<T> {
fn new(channels: usize, rec_size: usize, ileaved: bool) -> Self {
Self {
start: 0,
end: 0,
stride: if ileaved { rec_size * channels } else { rec_size },
channels,
ileaved,
data: vec![0.into(); rec_size * channels],
}
}
fn get_cur_size(&self) -> usize { self.end - self.start }
fn get_cur_avail(&self) -> usize { self.stride - self.end }
fn get_potentially_avail(&self) -> usize { self.stride - self.get_cur_size() }
fn read(&mut self, src: &NAAudioBuffer<T>) {
let mut to_copy = src.get_length();
if self.ileaved {
to_copy *= self.channels;
}
if self.get_cur_avail() < to_copy {
if self.get_potentially_avail() >= to_copy {
self.renorm();
} else {
let new_len = (self.stride * 2).max(self.get_cur_size() + src.get_length());
let mut new_buf = vec![0.into(); new_len * self.channels];
let new_stride = if !self.ileaved { new_len } else { new_len * self.channels };
let old_len = self.get_cur_size();
let new_len = src.get_length();
if old_len > 0 {
for (dst, (old, new)) in new_buf.chunks_exact_mut(new_stride).zip(
self.data.chunks_exact(self.stride).zip(
src.get_data().chunks(src.get_stride()))) {
dst[..old_len].copy_from_slice(&old[self.start..self.end]);
dst[old_len..][..new_len].copy_from_slice(&new[..new_len]);
}
} else {
for (dst, new) in new_buf.chunks_exact_mut(new_stride).zip(
src.get_data().chunks(src.get_stride())) {
dst[..new_len].copy_from_slice(&new[..new_len]);
}
}
self.data = new_buf;
self.stride = new_stride;
self.start = 0;
self.end = old_len + new_len;
return;
}
}
for (dst, src) in self.data.chunks_exact_mut(self.stride).zip(src.get_data().chunks_exact(src.get_stride())) {
dst[self.end..][..to_copy].copy_from_slice(&src[..to_copy]);
}
self.end += to_copy;
}
fn write(&mut self, dbuf: &mut NAAudioBuffer<T>) {
let dst_len = dbuf.get_length();
let dst_stride = dbuf.get_stride();
let dst = dbuf.get_data_mut().unwrap();
for (dst, src) in dst.chunks_mut(dst_stride).zip(self.data.chunks_exact(self.stride)) {
dst[..dst_len].copy_from_slice(&src[self.start..][..dst_len]);
}
self.start += dst_len;
}
fn renorm(&mut self) {
if self.start == 0 {
return;
}
let move_size = self.end - self.start;
if move_size > 0 {
for chan in self.data.chunks_exact_mut(self.stride) {
for i in 0..move_size {
chan[i] = chan[self.start + i];
}
}
}
self.end -= self.start;
self.start = 0;
}
}
enum AudioDataType {
U8(AudioQueue<u8>),
I16(AudioQueue<i16>),
I32(AudioQueue<i32>),
F32(AudioQueue<f32>),
Packed(AudioQueue<u8>),
}
impl AudioDataType {
fn get_length(&self) -> usize {
match self {
AudioDataType::U8(ref queue) => queue.get_cur_size(),
AudioDataType::I16(ref queue) => queue.get_cur_size(),
AudioDataType::I32(ref queue) => queue.get_cur_size(),
AudioDataType::F32(ref queue) => queue.get_cur_size(),
AudioDataType::Packed(ref queue) => queue.get_cur_size(),
}
}
}
pub struct AudioConverter {
queue: AudioDataType,
dst_fmt: NAAudioInfo,
dst_chmap: NAChannelMap,
apts: Option<u64>,
resampler: NAResample,
}
impl AudioConverter {
pub fn new(sinfo: &NAAudioInfo, dinfo: &NAAudioInfo, dst_chmap: NAChannelMap) -> Self {
let ch = usize::from(dinfo.channels);
let size = dinfo.block_len * 2;
let il = !dinfo.format.planar;
let queue = match (dinfo.format.bits, dinfo.format.float, dinfo.format.signed) {
( 8, false, false) => AudioDataType::U8(AudioQueue::new(ch, size, il)),
(16, false, true) => AudioDataType::I16(AudioQueue::new(ch, size, il)),
(32, false, true) => AudioDataType::I32(AudioQueue::new(ch, size, il)),
(32, true, _) => AudioDataType::F32(AudioQueue::new(ch, size, il)),
_ => AudioDataType::Packed(AudioQueue::new(ch, size, il)),
};
const RESAMPLE_FILTER_ORDER: usize = 16;
let resampler = NAResample::new(sinfo.sample_rate, dinfo, &dst_chmap, RESAMPLE_FILTER_ORDER);
Self {
queue,
dst_fmt: *dinfo,
dst_chmap,
apts: None,
resampler,
}
}
pub fn queue_frame(&mut self, buf: NABufferType, tinfo: NATimeInfo) -> bool {
let ret = self.resampler.convert_audio_frame(&buf);
if let Ok(dbuf) = ret {
if self.apts.is_none() && tinfo.get_pts().is_some() {
self.apts = tinfo.get_pts();
}
match (&mut self.queue, dbuf) {
(AudioDataType::U8(ref mut queue), NABufferType::AudioU8(ref buf)) => queue.read(buf),
(AudioDataType::I16(ref mut queue), NABufferType::AudioI16(ref buf)) => queue.read(buf),
(AudioDataType::I32(ref mut queue), NABufferType::AudioI32(ref buf)) => queue.read(buf),
(AudioDataType::F32(ref mut queue), NABufferType::AudioF32(ref buf)) => queue.read(buf),
(AudioDataType::Packed(ref mut queue), NABufferType::AudioPacked(ref buf)) => queue.read(buf),
_ => unimplemented!(),
};
true
} else {
false
}
}
pub fn get_frame(&mut self, info: NACodecInfoRef) -> Option<NAFrame> {
if self.queue.get_length() >= self.dst_fmt.block_len {
if let Ok(mut abuf) = alloc_audio_buffer(self.dst_fmt, self.dst_fmt.block_len, self.dst_chmap.clone()) {
match (&mut self.queue, &mut abuf) {
(AudioDataType::U8(ref mut queue), NABufferType::AudioU8(ref mut buf)) => queue.write(buf),
(AudioDataType::I16(ref mut queue), NABufferType::AudioI16(ref mut buf)) => queue.write(buf),
(AudioDataType::I32(ref mut queue), NABufferType::AudioI32(ref mut buf)) => queue.write(buf),
(AudioDataType::F32(ref mut queue), NABufferType::AudioF32(ref mut buf)) => queue.write(buf),
(AudioDataType::Packed(ref mut queue), NABufferType::AudioPacked(ref mut buf)) => queue.write(buf),
_ => unimplemented!(),
};
let tinfo = NATimeInfo::new(self.apts, None, Some(self.dst_fmt.block_len as u64), 1, self.dst_fmt.sample_rate);
if let Some(ref mut val) = self.apts {
*val += self.dst_fmt.block_len as u64;
}
Some(NAFrame::new(tinfo, FrameType::I, true, info, abuf))
} else {
println!(" failed to allocate audio frame");
None
}
} else {
None
}
}
}
|
