improve audio conversion

[nihav-encoder.git] / src / acvt.rs

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
        }
    }
}