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438 lines (417 loc) · 16.8 KB
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//! DNxHR encoder (RI profile, CBR, progressive).
//!
//! Every macroblock is transformed once (orthonormal 8×8 FDCT). Quantisation follows equation
//! 8.2 exactly (`X̂ = ⌊p·|X| / (qsf·W)⌋`, which the decoder reconstructs at the interval
//! midpoint). Rate control: a binary search finds the smallest uniform quantisation scale factor
//! whose frame fits the CBR payload, then macroblocks get one finer step in scan order while the
//! budget allows.
use crate::bits::Writer;
use crate::dct::fdct8x8;
use crate::header::{self, EOF_SIGNATURE, FieldCode, FrameHeader, SCAN_INDEX_OFFSET};
use crate::tables::{CidInfo, VlcSet, ZIGZAG, cid_info, vlc};
use crate::{ChromaFormat, ColorVolume, Error, Frame, Profile, Result};
/// Encoder configuration.
#[derive(Debug, Clone)]
pub struct EncoderConfig {
pub profile: Profile,
pub width: u32,
pub height: u32,
/// Coded sample depth: 8 for LB/SQ/HQ; 10 or 12 for HQX and 444.
pub bit_depth: u8,
pub color_volume: ColorVolume,
/// Pixel aspect ratio to signal (0/0 = not signalled).
pub par: (u16, u16),
}
impl EncoderConfig {
pub fn new(profile: Profile, width: u32, height: u32) -> EncoderConfig {
let bit_depth = match profile {
Profile::Hqx | Profile::R444 => 10,
_ => 8,
};
EncoderConfig { profile, width, height, bit_depth, color_volume: ColorVolume::Bt709, par: (0, 0) }
}
pub fn chroma(&self) -> ChromaFormat {
if self.profile == Profile::R444 { ChromaFormat::Yuv444 } else { ChromaFormat::Yuv422 }
}
}
/// DNxHR encoder.
pub struct Encoder {
cfg: EncoderConfig,
info: &'static CidInfo,
frame_size: u32,
header_size: u32,
last_q: u32,
}
/// Transformed macroblock data: per block, the DC value and the AC magnitudes pre-divided by
/// the weights (`p·|X|/W`, sign in the float's sign) in bitstream (zig-zag) order.
struct Prepared {
nw: usize,
ns: usize,
nblk: usize,
/// `[mb * nblk + k][r]`; `[..][0]` is the DC value.
t: Vec<[f32; 64]>,
/// DC bits of each macroblock (independent of the quantiser).
dc_bits: Vec<u32>,
}
impl Encoder {
/// An encoder with the default configuration; fails on rasters the profile can't code.
pub fn new(profile: Profile, width: u32, height: u32) -> Result<Encoder> {
Encoder::with_config(EncoderConfig::new(profile, width, height))
}
pub fn with_config(cfg: EncoderConfig) -> Result<Encoder> {
if cfg.width == 0 || cfg.height == 0 || cfg.width > 16384 || cfg.height > 16384 {
return Err(Error::Input(format!("unsupported raster {}x{}", cfg.width, cfg.height)));
}
if cfg.chroma() == ChromaFormat::Yuv422 && !cfg.width.is_multiple_of(2) {
return Err(Error::Input("4:2:2 needs an even width".into()));
}
let ok_depth = match cfg.profile {
Profile::Hqx | Profile::R444 => matches!(cfg.bit_depth, 10 | 12),
_ => cfg.bit_depth == 8,
};
if !ok_depth {
return Err(Error::Input(format!("{} does not support {}-bit", cfg.profile.name(), cfg.bit_depth)));
}
let info = cid_info(cfg.profile.cid()).ok_or_else(|| Error::Input(format!("no compression table for {}", cfg.profile.name())))?;
let frame_size = cfg.profile.frame_size(cfg.width, cfg.height);
let header_size = header::header_size_for(cfg.height);
Ok(Encoder { cfg, info, frame_size, header_size, last_q: 8 })
}
pub fn config(&self) -> &EncoderConfig {
&self.cfg
}
/// Size of every encoded frame in bytes (CBR).
pub fn frame_size(&self) -> u32 {
self.frame_size
}
/// Encode one frame. Its geometry and chroma format must match the configuration; samples
/// at another depth are rescaled to the coded depth.
pub fn encode(&mut self, f: &Frame) -> Result<Vec<u8>> {
let cfg = &self.cfg;
if f.width != cfg.width || f.height != cfg.height {
return Err(Error::Input(format!("frame is {}x{}, encoder is {}x{}", f.width, f.height, cfg.width, cfg.height)));
}
if f.chroma != cfg.chroma() {
return Err(Error::Input(format!("{:?} input for {}", f.chroma, cfg.profile.name())));
}
if !(8..=16).contains(&f.bit_depth) {
return Err(Error::Input(format!("unsupported input depth {}", f.bit_depth)));
}
let n = f.width as usize * f.height as usize;
let cn = f.chroma_width() as usize * f.chroma_height() as usize;
if f.y.len() != n || f.cb.len() != cn || f.cr.len() != cn {
return Err(Error::Input("plane sizes do not match the frame geometry".into()));
}
let prep = self.prepare(f);
let vlc = vlc(self.info.vlc);
let budget_bits = (self.frame_size as u64 - self.header_size as u64 - 4) * 8;
let q = self.rate_control(&prep, vlc, budget_bits);
self.write(&prep, vlc, &q, f.rgb)
}
fn mb_layout(&self) -> &'static [(u8, u8, u8)] {
match self.cfg.chroma() {
ChromaFormat::Yuv444 => {
&[(0, 0, 0), (0, 8, 0), (1, 0, 0), (1, 8, 0), (2, 0, 0), (2, 8, 0), (0, 0, 8), (0, 8, 8), (1, 0, 8), (1, 8, 8), (2, 0, 8), (2, 8, 8)]
}
_ => &[(0, 0, 0), (0, 8, 0), (1, 0, 0), (2, 0, 0), (0, 0, 8), (0, 8, 8), (1, 0, 8), (2, 0, 8)],
}
}
fn prepare(&self, f: &Frame) -> Prepared {
let cfg = &self.cfg;
let nw = cfg.width.div_ceil(16) as u
8000
size;
let ns = cfg.height.div_ceil(16) as usize;
let layout = self.mb_layout();
let nblk = layout.len();
let depth = cfg.bit_depth as i32;
let shift = depth - f.bit_depth as i32;
let mid = (1i32 << (depth - 1)) as f32;
let inv_scale = if depth == 12 { 0.25f32 } else { 1.0 };
let p = self.info.p as f32;
let w = self.info.weights;
let cmbw = if cfg.chroma() == ChromaFormat::Yuv444 { 16 } else { 8 };
let planes: [(&[u16], usize, usize, usize); 3] = [
(&f.y, f.width as usize, f.height as usize, 16),
(&f.cb, f.chroma_width() as usize, f.chroma_height() as usize, cmbw),
(&f.cr, f.chroma_width() as usize, f.chroma_height() as usize, cmbw),
];
let sample = |pl: usize, x: usize, y: usize| -> f32 {
let (d, pw, ph, _) = planes[pl];
let v = d[y.min(ph - 1) * pw + x.min(pw - 1)] as i32;
let v = if shift >= 0 { v << shift } else { (v + (1 << (-shift - 1))) >> -shift };
v.min((1 << depth) - 1) as f32 - mid
};
let do_row = |s: usize| -> Vec<[f32; 64]> {
let mut out = Vec::with_capacity(nw * nblk);
for mb in 0..nw {
for &(pl, xo, yo) in layout {
let pl = pl as usize;
let x0 = mb * planes[pl].3 + xo as usize;
let y0 = s * 16 + yo as usize;
let mut b = [0f32; 64];
for j in 0..8 {
for i in 0..8 {
b[j * 8 + i] = sample(pl, x0 + i, y0 + j);
}
}
fdct8x8(&mut b);
let wt = &w[(pl != 0) as usize];
let mut t = [0f32; 64];
let dc_max = if depth == 8 { 1023.0 } else { 4095.0 };
t[0] = (b[0] * inv_scale).round().clamp(-dc_max - 1.0, dc_max);
for r in 1..64 {
let z = ZIGZAG[r] as usize;
t[r] = b[z] * inv_scale * p / wt[z - 1] as f32;
}
out.push(t);
}
}
out
};
#[cfg(feature = "threads")]
let rows: Vec<Vec<[f32; 64]>> = {
use rayon::prelude::*;
(0..ns).into_par_iter().map(do_row).collect()
};
#[cfg(not(feature = "threads"))]
let rows: Vec<Vec<[f32; 64]>> = (0..ns).map(do_row).collect();
let t: Vec<[f32; 64]> = rows.into_iter().flatten().collect();
// DC bits with per-row, per-component prediction
let v = vlc(self.info.vlc);
let mut dc_bits = vec![0u32; nw * ns];
for s in 0..ns {
let mut pred = [0i32; 3];
for mb in 0..nw {
let mut bits = 0;
for (k, &(pl, _, _)) in layout.iter().enumerate() {
let dc = t[(s * nw + mb) * nblk + k][0] as i32;
let e = dc - pred[pl as usize];
pred[pl as usize] = dc;
let eta = dc_eta(e);
bits += v.dc_code[eta as usize].1 as u32 + eta;
}
dc_bits[s * nw + mb] = bits;
}
}
Prepared { nw, ns, nblk, t, dc_bits }
}
/// Per-macroblock qsf values whose coded frame fits `budget_bits`.
fn rate_control(&mut self, prep: &Prepared, vlc: &VlcSet, budget_bits: u64) -> Vec<u32> {
let p_bits = if self.cfg.bit_depth == 8 { 4 } else { 6 };
let max_amp = if p_bits == 4 { 1024 } else { 4096 };
let nmb = prep.nw * prep.ns;
let mb_bits = |mb: usize, q: u32| -> u32 {
let mut bits = 12 + prep.dc_bits[mb];
for k in 0..prep.nblk {
bits += ac_bits(&prep.t[mb * prep.nblk + k], q as f32, vlc, p_bits, max_amp);
}
bits
};
let frame_bits = |q: u32| -> u64 {
let row = |s: usize| -> u64 { row_bytes((0..prep.nw).map(|m| mb_bits(s * prep.nw + m, q) as u64).sum()) * 8 };
#[cfg(feature = "threads")]
{
use rayon::prelude::*;
(0..prep.ns).into_par_iter().map(row).sum()
}
#[cfg(not(feature = "threads"))]
{
(0..prep.ns).map(row).sum()
}
};
// smallest feasible uniform q (bits are non-increasing in q)
let (mut lo, mut hi) = (1u32, 2047u32);
if frame_bits(1) <= budget_bits {
hi = 1;
} else {
// bracket around the previous frame's choice first
let g = self.last_q.clamp(2, 2047);
if frame_bits(g) <= budget_bits {
hi = g;
let g2 = (g / 2).max(1);
if g2 > 1 && frame_bits(g2) > budget_bits {
lo = g2;
}
} else {
lo = g;
}
while hi - lo > 1 {
let m = (lo + hi) / 2;
if frame_bits(m) <= budget_bits { hi = m } else { lo = m }
}
}
let q = hi;
self.last_q = q;
let mut qs = vec![q; nmb];
if q > 1 {
// refine: one finer step per macroblock while the budget allows
let mut row_bits: Vec<u64> = (0..prep.ns).map(|s| (0..prep.nw).map(|m| mb_bits(s * prep.nw + m, q) as u64).sum()).collect();
let mut total: u64 = row_bits.iter().map(|&b| row_bytes(b) * 8).sum();
let cur: Vec<u32> = (0..nmb).map(|mb| mb_bits(mb, q)).collect();
let finer: Vec<u32> = (0..nmb).map(|mb| mb_bits(mb, q - 1)).collect();
// spread the refinement evenly over the frame: visit macroblocks in a strided order
let stride = 7919usize;
let mut idx = 0usize;
for _ in 0..nmb {
idx = (idx + stride) % nmb;
let s = idx / prep.nw;
let extra = finer[idx] as u64 - cur[idx].min(finer[idx]) as u64;
let nb = row_bits[s] + extra;
let nt = total - row_bytes(row_bits[s]) * 8 + row_bytes(nb) * 8;
if nt <= budget_bits {
row_bits[s] = nb;
total = nt;
qs[idx] = q - 1;
}
}
}
qs
}
fn write(&self, prep: &Prepared, vlc: &VlcSet, qs: &[u32], rgb: bool) -> Result<Vec<u8>> {
let cfg = &self.cfg;
let p_bits = if cfg.bit_depth == 8 { 4 } else { 6 };
let max_amp = if p_bits == 4 { 1024 } else { 4096 };
let layout = self.mb_layout();
// 4:4:4 signalling as ffmpeg writes and reads it (see `FrameHeader::rgb_planes`): RGB is
// CLF = 0 with ACF = 0; Y'CbCr is CLF = 1 with ACF = 1 on every macroblock.
let ycbcr444 = cfg.chroma() == ChromaFormat::Yuv444 && !rgb;
let write_row = |s: usize| -> Vec<u8> {
let mut w = Writer::new();
let mut pred = [0i32; 3];
for mb in 0..prep.nw {
let m = s * prep.nw + mb;
let q = qs[m];
w.put(q, 11);
w.put(ycbcr444 as u32, 1);
for (k, &(pl, _, _)) in layout.iter().enumerate() {
let t = &prep.t[m * prep.nblk + k];
let dc = t[0] as i32;
let e = dc - pred[pl as usize];
pred[pl as usize] = dc;
let eta = dc_eta(e);
let (c, l) = vlc.dc_code[eta as usize];
w.put(c as u32, l as u32);
if eta > 0 {
let rho = if e > 0 { e } else { e + (1 << eta) - 1 };
w.put(rho as u32, eta);
}
write_ac(&mut w, t, q as f32, vlc, p_bits, max_amp);
}
}
w.finish_aligned(4)
};
#[cfg(feature = "threads")]
let rows: Vec<Vec<u8>> = {
use rayon::prelude::*;
(0..prep.ns).into_par_iter().map(write_row).collect()
};
#[cfg(not(feature = "threads"))]
let rows: Vec<Vec<u8>> = (0..prep.ns).map(write_row).collect();
let h = FrameHeader {
header_size: self.header_size,
version: 3,
cid: self.info.cid,
vbr: false,
field: FieldCode::Frame,
macf: false,
crc: false,
alpha: false,
lossless_alpha: false,
premultiplied_alpha: false,
width: cfg.width,
lines: cfg.height,
par: cfg.par,
bit_depth: cfg.bit_depth,
interlaced: false,
frame_encoding: true,
chroma: cfg.chroma(),
rgb: ycbcr444,
color_volume: cfg.color_volume,
timecode: None,
mb_rows: prep.ns as u32,
};
let mut out = header::write(&h);
out.reserve(self.frame_size as usize - out.len());
let mut off = 0u32;
for (s, r) in rows.iter().enumerate() {
let o = SCAN_INDEX_OFFSET + 4 * s;
out[o..o + 4].copy_from_slice(&off.to_be_bytes());
off += r.len() as u32;
}
for r in rows {
out.extend_from_slice(&r);
}
let end = self.frame_size as usize - 4;
if out.len() > end {
return Err(Error::Input("rate control overflow".into()));
}
out.resize(end, 0);
out.extend_from_slice(&EOF_SIGNATURE);
Ok(out)
}
}
#[inline]
fn row_bytes(bits: u64) -> u64 {
bits.div_ceil(32) * 4
}
#[inline]
fn dc_eta(e: i32) -> u32 {
if e == 0 { 0 } else { 32 - e.unsigned_abs().leading_zeros() }
}
/// Quantised amplitude (≥ 1) of a pre-divided magnitude `|t| ≥ q`: the nearest reconstruction
/// level for decoders that reconstruct at `(A + 3/4)·step` (ffmpeg and ours by default).
#[inline(always)]
fn quant(t: f32, q: f32, max_amp: u32) -> u32 {
((t.abs() / q - 0.25) as u32).clamp(1, max_amp)
}
/// Bits of a block's AC coefficients plus EOB at quantiser `q`.
#[inline]
fn ac_bits(t: &[f32; 64], q: f32, v: &VlcSet, p_bits: u32, max_amp: u32) -> u32 {
let mut bits = v.eob.1 as u32;
let mut run = 0usize;
for &x in &t[1..] {
if x.abs() < q {
run += 1;
continue;
}
let a = quant(x, q, max_amp);
let p = (a - 1) >> 6;
let base = ((a - 1) & 63) as usize;
let frun = (run > 0) as usize;
let findex = (p > 0) as usize;
bits += v.amp_code[frun][findex][base].1 as u32 + 1;
if findex == 1 {
bits += p_bits;
}
if frun == 1 {
bits += v.run_code[run].1 as u32;
}
run = 0;
}
bits
}
fn write_ac(w: &mut Writer, t: &[f32; 64], q: f32, v: &VlcSet, p_bits: u32, max_amp: u32) {
let mut run = 0usize;
for &x in &t[1..] {
if x.abs() < q {
run += 1;
continue;
}
let a = quant(x, q, max_amp);
let p = (a - 1) >> 6;
let base = ((a - 1) & 63) as usize;
let frun = (run > 0) as usize;
let findex = (p > 0) as usize;
let (c, l) = v.amp_code[frun][findex][base];
w.put(c as u32, l as u32);
w.put((x < 0.0) as u32, 1);
if findex == 1 {
w.put(p, p_bits);
}
if frun == 1 {
let (c, l) = v.run_code[run];
w.put(c as u32, l as u32);
}
run = 0;
}
w.put(v.eob.0 as u32, v.eob.1 as u32);
}