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Copy pathtile.rs
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1082 lines (1041 loc) · 41.7 KB
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//! Tile decoding: partition trees, mode info (6.4), and block reconstruction. One `TileDecoder`
//! decodes all tiles of one tile column (tile columns are independent of each other; tile rows
//! of a column are decoded in order).
use crate::boolcoder::BoolDecoder;
use crate::frame::{Frame, MiGrid, MiInfo, Mv};
use crate::header::{FrameHeader, Segmentation};
use crate::probs::{Counts, FrameContext};
use crate::tables::*;
mod recon;
/// A reference frame as used by the current frame, with its scale factors (8.5.2.3).
pub struct RefUse<'a> {
pub frame: &'a Frame,
pub x_scale: i32,
pub y_scale: i32,
pub x_step: i32,
pub y_step: i32,
}
/// Read-only data shared by all tile columns of a frame.
pub struct FrameShared<'a> {
pub h: &'a FrameHeader,
pub fc: &'a FrameContext,
pub seg: &'a Segmentation,
/// PrevSegmentIds (MiRows x MiCols).
pub prev_seg_ids: &'a [u8],
/// Mode info of the previous frame when UsePrevFrameMvs is 1.
pub prev_mi: Option<&'a MiGrid>,
/// References for LAST, GOLDEN, ALTREF.
pub refs: [Option<RefUse<'a>>; 3],
/// Quantizers per segment: [segment][plane > 0][dc = 0 / ac = 1].
pub seg_q: [[[i32; 2]; 2]; 8],
/// Whether syntax elements need to be counted (backward adaptation enabled).
pub counting: bool,
pub pools: &'a crate::frame::Pools,
}
/// Output of one tile column: samples, mode info and segment ids of its columns.
pub struct Strip {
pub mi_col_start: usize,
pub mi_col_end: usize,
/// Mode info, (mi_col_end - mi_col_start) x MiRows.
pub mi: Vec<MiInfo>,
pub seg_ids: Vec<u8>,
pub planes: [Vec<u16>; 3],
pub strides: [usize; 3],
/// Plane x coordinate of the first column of each plane buffer.
pub x_off: [usize; 3],
pub counts: Box<Counts>,
/// Statistics.
pub compound_blocks: u64,
pub scaled_blocks: u64,
pub intra_blocks: u64,
pub inter_blocks: u64,
}
/// Per-block state (the variables of 6.4.4 - 6.4.20).
#[derive(Clone, Copy, Default)]
struct Blk {
r: usize,
c: usize,
size: u8,
avail_u: bool,
avail_l: bool,
seg_id: u8,
skip: bool,
tx_size: u8,
is_inter: bool,
y_mode: u8,
sub_modes: [u8; 4],
uv_mode: u8,
ref_frame: [i8; 2],
interp_filter: u8,
block_mvs: [[Mv; 4]; 2],
left_ref: [i8; 2],
above_ref: [i8; 2],
left_intra: bool,
above_intra: bool,
left_single: bool,
above_single: bool,
eob_total: u32,
}
pub struct TileDecoder<'a> {
s: &'a FrameShared<'a>,
h: &'a FrameHeader,
fc: &'a FrameContext,
pub strip: Strip,
mi_cols: usize,
mi_rows: usize,
ss_x: usize,
ss_y: usize,
bit_depth: u8,
// Contexts (indexed by absolute position).
above_nonzero: [Vec<u8>; 3],
left_nonzero: [Vec<u8>; 3],
above_partition: Vec<u8>,
left_partition: Vec<u8>,
above_seg_pred: Vec<u8>,
left_seg_pred: Vec<u8>,
// MV prediction state.
ref_list_mv: [Mv; 2],
ref_mv_count: usize,
mode_context: [u8; 4],
nearest_mv: [Mv; 2],
near_mv: [Mv; 2],
best_mv: [Mv; 2],
// Scratch.
coefs: Vec<i32>,
token_cache: Vec<u8>,
pred: Vec<u16>,
pred2: Vec<u16>,
mc_tmp: Vec<u16>,
mc_win: Vec<u16>,
/// First error met while decoding (e.g. a block referencing an unusable reference frame).
pub error: Option<crate::error::Error>,
}
impl<'a> TileDecoder<'a> {
pub fn new(s: &'a FrameShared<'a>, mi_col_start: usize, mi_col_end: usize) -> Self {
let h = s.h;
let (mi_cols, mi_rows) = (h.mi_cols as usize, h.mi_rows as usize);
let (ss_x, ss_y) = (h.color.subsampling_x as usize, h.color.subsampling_y as usize);
let sb_rows = h.sb64_rows as usize;
let sb_cols = h.sb64_cols as usize;
let strip_w = (mi_col_end - mi_col_start).div_ceil(8) * 64;
let strip_h = sb_rows * 64;
let x0 = mi_col_start * 8;
let uv_len = (strip_w >> ss_x) * (strip_h >> ss_y);
let planes = [s.pools.samples.take(strip_w * strip_h, 0), s.pools.samples.take(uv_len, 0), s.pools.samples.take(uv_len, 0)];
let mi_w = mi_col_end - mi_col_start;
let strip = Strip {
mi_col_start,
mi_col_end,
mi: s.pools.mi.take(mi_w * mi_rows, MiInfo::default()),
seg_ids: vec![0; mi_w * mi_rows],
planes,
strides: [strip_w, strip_w >> ss_x, strip_w >> ss_x],
x_off: [x0, x0 >> ss_x, x0 >> ss_x],
counts: Box::default(),
compound_blocks: 0,
scaled_blocks: 0,
intra_blocks: 0,
inter_blocks: 0,
};
let an = sb_cols * 16 + 16;
let ln = sb_rows * 16 + 16;
TileDecoder {
s,
h,
fc: s.fc,
strip,
mi_cols,
mi_rows,
ss_x,
ss_y,
bit_depth: h.color.bit_depth,
above_nonzero: [vec![0; an], vec![0; an], vec![0; an]],
left_nonzero: [vec![0; ln], vec![0; ln], vec![0; ln]],
above_partition: vec![0; sb_cols * 8 + 8],
left_partition: vec![0; sb_rows * 8 + 8],
above_seg_pred: vec![0; sb_cols * 8 + 8],
left_seg_pred: vec![0; sb_rows * 8 + 8],
ref_list_mv: [Mv::ZERO; 2],
ref_mv_count: 0,
mode_context: [0; 4],
nearest_mv: [Mv::ZERO; 2],
near_mv: [Mv::ZERO; 2],
best_mv: [Mv::ZERO; 2],
coefs: vec![0; 1024],
token_cache: vec![0; 1024],
pred: vec![0; 64 * 64],
pred2: vec![0; 64 * 64],
// Scaled prediction reads up to 5x the block height (8.5.2.3), unscaled h + 7 rows.
mc_tmp: vec![0; if s.refs.iter().flatten().any(|r| r.x_scale != 1 << 14 || r.y_scale != 1 << 14) { 64 * (64 * 5 + 16) } else { 64 * 71 }],
mc_win: vec![0; 71 * 71],
error: None,
}
}
#[inline]
fn mi_at(&self, r: usize, c: usize) -> &MiInfo {
&self.strip.mi[r * (self.strip.mi_col_end - self.strip.mi_col_start) + c - self.strip.mi_col_start]
}
/// decode_tile (6.4.2) for one tile of this column. Returns false if the data ran out badly.
pub fn decode_tile(&mut self, data: &[u8], mi_row_start: usize, mi_row_end: usize) -> bool {
let mut bd = BoolDecoder::new(data);
let (cs, ce) = (self.strip.mi_col_start, self.strip.mi_col_end);
for r in (mi_row_start..mi_row_end).step_by(8) {
// clear_left_context
for p in 0..3 {
let sy = if p > 0 { self.ss_y } else { 0 };
let s = (r * 2) >> sy;
let e = (s + (16 >> sy)).min(self.left_nonzero[p].len());
self.left_nonzero[p][s..e].fill(0);
}
self.left_partition[r..r + 8].fill(0);
self.left_seg_pred[r..r + 8].fill(0);
for c in (cs..ce).step_by(8) {
self.decode_partition(&mut bd, r, c, BLOCK_64X64);
}
}
true
}
fn decode_partition(&mut self, bd: &mut BoolDecoder, r: usize, c: usize, bsize: u8) {
if r >= self.mi_rows || c >= self.mi_cols {
return;
}
let num8x8 = NUM_8X8_WIDE[bsize as usize] as usize;
let half = num8x8 >> 1;
let has_rows = (r + half) < self.mi_rows;
let has_cols = (c + half) < self.mi_cols;
let bsl = MI_WIDTH_LOG2[bsize as usize] as usize;
let boffset = 3 - bsl;
let mut above = 0u8;
let mut left = 0u8;
for i in 0..num8x8 {
above |= self.above_partition[c + i];
left |= self.left_partition[r + i];
}
let above = (above >> boffset) & 1;
let left = (left >> boffset) & 1;
let ctx = bsl * 4 + left as usize * 2 + above as usize;
let probs: &[u8] = if self.h.frame_is_intra { &KF_PARTITION_PROBS[ctx * 3..ctx * 3 + 3] } else { &self.fc.partition[ctx] };
let partition = if has_rows && has_cols {
bd.read_tree(&PARTITION_TREE, probs)
} else if has_cols {
if bd.read_bool(probs[1]) { 3 } else { 1 }
} else if has_rows {
if bd.read_bool(probs[2]) { 3 } else { 2 }
} else {
3
};
if self.s.counting {
self.strip.counts.partition[ctx][partition as usize] += 1;
}
let subsize = SUBSIZE_LOOKUP[partition as usize][bsize as usize];
if subsize < BLOCK_8X8 || partition == 0 {
self.decode_block(bd, r, c, subsize);
} else if partition == 1 {
self.decode_block(bd, r, c, subsize);
if has_rows {
self.decode_block(bd, r + half, c, subsize);
}
} else if partition == 2 {
self.decode_block(bd, r, c, subsize);
if has_cols {
self.decode_block(bd, r, c + half, subsize);
}
} else {
self.decode_partition(bd, r, c, subsize);
self.decode_partition(bd, r, c + half, subsize);
self.decode_partition(bd, r + half, c, subsize);
self.decode_partition(bd, r + half, c + half, subsize);
}
if bsize == BLOCK_8X8 || partition != 3 {
let a = 15 >> B_WIDTH_LOG2[subsize as usize];
let l = 15 >> B_HEIGHT_LOG2[subsize as usize];
self.above_partition[c..c + num8x8].fill(a);
self.left_partition[r..r + num8x8].fill(l);
}
}
fn decode_block(&mut self, bd: &mut BoolDecoder, r: usize, c: usize, size: u8) {
let mut b = Blk { r, c, size, avail_u: r > 0, avail_l: c > self.strip.mi_col_start, ..Default::default() };
// Chroma block size must be valid (7.4.3); treat violations as a damaged stream.
if size >= BLOCK_8X8 && SS_SIZE_LOOKUP[size as usize][self.ss_x][self.ss_y] == BLOCK_INVALID {
b.size = BLOCK_8X8;
}
if self.h.frame_is_intra {
self.intra_frame_mode_info(bd, &mut b);
} else {
self.inter_frame_mode_info(bd, &mut b);
}
if b.is_inter {
self.strip.inter_blocks += 1;
} else {
self.strip.intra_blocks += 1;
}
self.residual(bd, &mut b);
if b.is_inter && b.size >= BLOCK_8X8 && b.eob_total == 0 {
b.skip = true;
}
let info = MiInfo {
sb_size: b.size,
skip: b.skip,
tx_size: b.tx_size,
y_mode: b.y_mode,
sub_modes: b.sub_modes,
seg_id: b.seg_id,
ref_frame: b.ref_frame,
interp_filter: b.interp_filter,
mv: b.block_mvs,
};
let bh = NUM_8X8_HIGH[b.size as usize] as usize;
let bw = NUM_8X8_WIDE[b.size as usize] as usize;
let mi_w = self.strip.mi_col_end - self.strip.mi_col_start;
let (y1, x1) = ((r + bh).min(self.mi_rows), (c + bw).min(self.strip.mi_col_end));
for y in r..y1 {
let row = y * mi_w;
for x in c..x1 {
self.strip.mi[row + x - self.strip.mi_col_start] = info;
self.strip.seg_ids[row + x - self.strip.mi_col_start] = b.seg_id;
}
}
}
// ---------------------------------------------------------------- mode info (6.4.5 - 6.4.20)
fn intra_frame_mode_info(&mut self, bd: &mut BoolDecoder, b: &mut Blk) {
// intra_segment_id
b.seg_id = if self.s.seg.enabled && self.s.seg.update_map { bd.read_tree(&SEGMENT_TREE, &self.s.seg.tree_probs) } else { 0 };
self.read_skip(bd, b);
self.read_tx_size(bd, b, true);
b.ref_frame = [INTRA_FRAME, NONE];
b.is_inter = false;
let above_mi = if b.avail_u { Some(*self.mi_at(b.r - 1, b.c)) } else { None };
let left_mi = if b.avail_l { Some(*self.mi_at(b.r, b.c - 1)) } else { None };
if b.size >= BLOCK_8X8 {
let above = above_mi.map_or(DC_PRED, |m| m.sub_modes[2]);
let left = left_mi.map_or(DC_PRED, |m| m.sub_modes[1]);
let o = (above as usize * 10 + left as usize) * 9;
let mode = bd.read_tree(&INTRA_MODE_TREE, &KF_Y_MODE_PROBS[o..o + 9]);
b.y_mode = mode;
b.sub_modes = [mode; 4];
} else {
let n4w = NUM_4X4_WIDE[b.size as usize] as usize;
let n4h = NUM_4X4_HIGH[b.size as usize] as usize;
let mut mode = 0;
let mut idy = 0;
while idy < 2 {
let mut idx = 0;
while idx < 2 {
let above = if idy > 0 { b.sub_modes[idx] } else { above_mi.map_or(DC_PRED, |m| m.sub_modes[2 + idx]) };
let left = if idx > 0 { b.sub_modes[idy * 2] } else { left_mi.map_or(DC_PRED, |m| m.sub_modes[1 + idy * 2]) };
let o = (above as usize * 10 + left as usize) * 9;
mode = bd.read_tree(&INTRA_MODE_TREE, &KF_Y_MODE_PROBS[o..o + 9]);
for y2 in 0..n4h {
for x2 in 0..n4w {
b.sub_modes[(idy + y2) * 2 + idx + x2] = mode;
}
}
idx += n4w;
}
idy += n4h;
}
b.y_mode = mode;
}
let o = b.y_mode as usize * 9;
b.uv_mode = bd.read_tree(&INTRA_MODE_TREE, &KF_UV_MODE_PROBS[o..o + 9]);
}
fn read_skip(&mut self, bd: &mut BoolDecoder, b: &mut Blk) {
if self.s.seg.feature_active(b.seg_id, SEG_LVL_SKIP) {
b.skip = true;
} else {
let mut ctx = 0;
if b.avail_u {
ctx += self.mi_at(b.r - 1, b.c).skip as usize;
}
if b.avail_l {
ctx += self.mi_at(b.r, b.c - 1).skip as usize;
}
b.skip = bd.read_bool(self.fc.skip[ctx]);
if self.s.counting {
self.strip.counts.skip[ctx][b.skip as usize] += 1;
}
}
}
fn read_tx_size(&mut self, bd: &mut BoolDecoder, b: &mut Blk, allow_select: bool) {
let max_tx = MAX_TXSIZE[b.size as usize];
if allow_select && self.h.tx_mode == TX_MODE_SELECT && b.size >= BLOCK_8X8 {
let mut above = max_tx;
let mut left = max_tx;
if b.avail_u {
let m = self.mi_at(b.r - 1, b.c);
if !m.skip {
above = m.tx_size;
}
}
if b.avail_l {
let m = self.mi_at(b.r, b.c - 1);
if !m.skip {
left = m.tx_size;
}
}
if !b.avail_l {
left = above;
}
if !b.avail_u {
above = left;
}
let ctx = ((above + left) > max_tx) as usize;
let tree: &[i8] = match max_tx {
3 => &TX_SIZE_32_TREE,
2 => &TX_SIZE_16_TREE,
_ => &TX_SIZE_8_TREE,
};
b.tx_size = bd.read_tree(tree, &self.fc.tx[max_tx as usize][ctx]);
if self.s.counting {
self.strip.counts.tx[max_tx as usize][ctx][b.tx_size as usize] += 1;
}
} else {
b.tx_size = max_tx.min(TX_MODE_TO_BIGGEST_TX_SIZE[self.h.tx_mode as usize]);
}
}
fn inter_frame_mode_info(&mut self, bd: &mut BoolDecoder, b: &mut Blk) {
b.left_ref = if b.avail_l { self.mi_at(b.r, b.c - 1).ref_frame } else { [INTRA_FRAME, NONE] };
b.above_ref = if b.avail_u { self.mi_at(b.r - 1, b.c).ref_frame } else { [INTRA_FRAME, NONE] };
b.left_intra = b.left_ref[0] <= INTRA_FRAME;
b.above_intra = b.above_ref[0] <= INTRA_FRAME;
b.left_single = b.left_ref[1] <= NONE;
b.above_single = b.above_ref[1] <= NONE;
self.inter_segment_id(bd, b);
self.read_skip(bd, b);
self.read_is_inter(bd, b);
let allow = !b.skip || !b.is_inter;
self.read_tx_size(bd, b, allow);
if b.is_inter {
self.inter_block_mode_info(bd, b);
} else {
self.intra_block_mode_info(bd, b);
}
}
fn get_segment_id(&self, b: &Blk) -> u8 {
let bw = NUM_8X8_WIDE[b.size as usize] as usize;
let bh = NUM_8X8_HIGH[b.size as usize] as usize;
let xmis = (self.mi_cols - b.c).min(bw);
let ymis = (self.mi_rows - b.r).min(bh);
let mut seg = 7;
let prev = self.s.prev_seg_ids;
if prev.is_empty() {
return 0;
}
for y in 0..ymis {
for x in 0..xmis {
seg = seg.min(prev[(b.r + y) * self.mi_cols + b.c + x]);
}
}
seg
}
fn inter_segment_id(&mut self, bd: &mut BoolDecoder, b: &mut Blk) {
let seg = self.s.seg;
if !seg.enabled {
b.seg_id = 0;
return;
}
let predicted = self.get_segment_id(b);
if !seg.update_map {
b.seg_id = predicted;
return;
}
if seg.temporal_update {
let ctx = (self.left_seg_pred[b.r] + self.above_seg_pred[b.c]) as usize;
let pred_flag = bd.read_bool(seg.pred_probs[ctx]);
b.seg_id = if pred_flag { predicted } else { bd.read_tree(&SEGMENT_TREE, &seg.tree_probs) };
let bw = NUM_8X8_WIDE[b.size as usize] as usize;
let bh = NUM_8X8_HIGH[b.size as usize] as usize;
self.above_seg_pred[b.c..b.c + bw].fill(pred_flag as u8);
self.left_seg_pred[b.r..b.r + bh].fill(pred_flag as u8);
} else {
b.seg_id = bd.read_tree(&SEGMENT_TREE, &seg.tree_probs);
}
}
fn read_is_inter(&mut self, bd: &mut BoolDecoder, b: &mut Blk) {
if self.s.seg.feature_active(b.seg_id, SEG_LVL_REF_FRAME) {
b.is_inter = self.s.seg.feature_data[b.seg_id as usize][SEG_LVL_REF_FRAME] != INTRA_FRAME as i16;
} else {
let ctx = if b.avail_u && b.avail_l {
if b.left_intra && b.above_intra { 3 } else { (b.left_intra || b.above_intra) as usize }
} else if b.avail_u || b.avail_l {
2 * (if b.avail_u { b.above_intra } else { b.left_intra }) as usize
} else {
0
};
b.is_inter = bd.read_bool(self.fc.is_inter[ctx]);
if self.s.counting {
self.strip.counts.is_inter[ctx][b.is_inter as usize] += 1;
}
}
}
fn intra_block_mode_info(&mut self, bd: &mut BoolDecoder, b: &mut Blk) {
b.ref_frame = [INTRA_FRAME, NONE];
if b.size >= BLOCK_8X8 {
let ctx = SIZE_GROUP[b.size as usize] as usize;
let mode = bd.read_tree(&INTRA_MODE_TREE, &self.fc.y_mode[ctx]);
if self.s.counting {
self.strip.counts.intra_mode[ctx][mode as usize] += 1;
}
b.y_mode = mode;
b.sub_modes = [mode; 4];
} else {
let n4w = NUM_4X4_WIDE[b.size as usize] as usize;
let n4h = NUM_4X4_HIGH[b.size as usize] as usize;
let mut mode = 0;
let mut idy = 0;
while idy < 2 {
let mut idx = 0;
while idx < 2 {
mode = bd.read_tree(&INTRA_MODE_TREE, &self.fc.y_mode[0]);
if self.s.counting {
self.strip.counts.intra_mode[0][mode as usize] += 1;
}
for y2 in 0..n4h {
for x2 in 0..n4w {
b.sub_modes[(idy + y2) * 2 + idx + x2] = mode;
}
}
idx += n4w;
}
idy += n4h;
}
b.y_mode = mode;
}
b.uv_mode = bd.read_tree(&INTRA_MODE_TREE, &self.fc.uv_mode[b.y_mode as usize]);
if self.s.counting {
self.strip.counts.uv_mode[b.y_mode as usize][b.uv_mode as usize] += 1;
}
}
fn inter_block_mode_info(&mut self, bd: &mut BoolDecoder, b: &mut Blk) {
self.read_ref_frames(bd, b);
let is_compound = b.ref_frame[1] > INTRA_FRAME;
if is_compound {
self.strip.compound_blocks += 1;
}
for j in 0..1 + is_compound as usize {
let rf = b.ref_frame[j];
self.find_mv_refs(b, rf, -1);
self.find_best_ref_mvs(b, j);
}
b.sub_modes = [DC_PRED; 4];
if self.s.seg.feature_active(b.seg_id, SEG_LVL_SKIP) {
b.y_mode = ZEROMV;
} else if b.size >= BLOCK_8X8 {
let ctx = self.mode_context[b.ref_frame[0] as usize] as usize;
let inter_mode = bd.read_tree(&INTER_MODE_TREE, &self.fc.inter_mode[ctx.min(6)]);
if self.s.counting {
self.strip.counts.inter_mode[ctx.min(6)][inter_mode as usize] += 1;
}
b.y_mode = NEARESTMV + inter_mode;
}
b.interp_filter = if self.h.interp_filter == SWITCHABLE {
let left = if b.avail_l && b.left_ref[0] > INTRA_FRAME { self.mi_at(b.r, b.c - 1).interp_filter } else { 3 };
let above = if b.avail_u && b.above_ref[0] > INTRA_FRAME { self.mi_at(b.r - 1, b.c).interp_filter } else { 3 };
let ctx = if left == above {
left
} else if left == 3 && above != 3 {
above
} else if left != 3 && above == 3 {
left
} else {
3
} as usize;
let f = bd.read_tree(&INTERP_FILTER_TREE, &self.fc.interp_filter[ctx]);
if self.s.counting {
self.strip.counts.interp_filter[ctx][f as usize] += 1;
}
f
} else {
self.h.interp_filter
};
b.block_mvs = [[Mv::ZERO; 4]; 2];
if b.size < BLOCK_8X8 {
let n4w = NUM_4X4_WIDE[b.size as usize] as usize;
let n4h = NUM_4X4_HIGH[b.size as usize] as usize;
let mut idy = 0;
while idy < 2 {
let mut idx = 0;
while idx < 2 {
let ctx = self.mode_context[b.ref_frame[0] as usize] as usize;
let inter_mode = bd.read_tree(&INTER_MODE_TREE, &self.fc.inter_mode[ctx.min(6)]);
if self.s.counting {
self.strip.counts.inter_mode[ctx.min(6)][inter_mode as usize] += 1;
}
b.y_mode = NEARESTMV + inter_mode;
if b.y_mode == NEARESTMV || b.y_mode == NEARMV {
for j in 0..1 + is_compound as usize {
self.append_sub8x8_mvs(b, (idy * 2 + idx) as i32, j);
}
}
let mv = self.assign_mv(bd, b, is_compound);
for y2 in 0..n4h {
for x2 in 0..n4w {
let blk = (idy + y2) * 2 + idx + x2;
for l in 0..1 + is_compound as usize {
b.block_mvs[l][blk] = mv[l];
}
}
}
idx += n4w;
}
idy += n4h;
}
} else {
let mv = self.assign_mv(bd, b, is_compound);
for l in 0..1 + is_compound as usize {
b.block_mvs[l] = [mv[l]; 4];
}
}
}
fn read_ref_frames(&mut self, bd: &mut BoolDecoder, b: &mut Blk) {
let seg = self.s.seg;
if seg.feature_active(b.seg_id, SEG_LVL_REF_FRAME) {
b.ref_frame = [(seg.feature_data[b.seg_id as usize][SEG_LVL_REF_FRAME] as i8).clamp(LAST_FRAME, ALTREF_FRAME), NONE];
return;
}
let h = self.h;
let comp_mode = if h.reference_mode == 2 {
let ctx = self.comp_mode_ctx(b);
let v = bd.read_bool(self.fc.comp_mode[ctx]);
if self.s.counting {
self.strip.counts.comp_mode[ctx][v as usize] += 1;
}
v as u8
} else {
h.reference_mode
};
if comp_mode == 1 {
let idx = h.ref_frame_sign_bias[h.comp_fixed_ref as usize] as usize;
let ctx = self.comp_ref_ctx(b);
let comp_ref = bd.read_bool(self.fc.comp_ref[ctx]);
if self.s.counting {
self.strip.counts.comp_ref[ctx][comp_ref as usize] += 1;
}
b.ref_frame[idx] = h.comp_fixed_ref;
b.ref_frame[1 - idx] = h.comp_var_ref[comp_ref as usize];
} else {
let ctx = self.single_ref_p1_ctx(b);
let p1 = bd.read_bool(self.fc.single_ref[ctx][0]);
if self.s.counting {
self.strip.counts.single_ref[ctx][0][p1 as usize] += 1;
}
b.ref_frame[0] = if p1 {
let ctx2 = self.single_ref_p2_ctx(b);
let p2 = bd.read_bool(self.fc.single_ref[ctx2][1]);
if self.s.counting {
self.strip.counts.single_ref[ctx2][1][p2 as usize] += 1;
}
if p2 { ALTREF_FRAME } else { GOLDEN_FRAME }
} else {
LAST_FRAME
};
b.ref_frame[1] = NONE;
}
}
fn comp_mode_ctx(&self, b: &Blk) -> usize {
let fixed = self.h.comp_fixed_ref;
(if b.avail_u && b.avail_l {
if b.above_single && b.left_single {
((b.above_ref[0] == fixed) ^ (b.left_ref[0] == fixed)) as u8
} else if b.above_single {
2 + (b.above_ref[0] == fixed || b.above_intra) as u8
} else if b.left_single {
2 + (b.left_ref[0] == fixed || b.left_intra) as u8
} else {
4
}
} else if b.avail_u {
if b.above_single { (b.above_ref[0] == fixed) as u8 } else { 3 }
} else if b.avail_l {
if b.left_single { (b.left_ref[0] == fixed) as u8 } else { 3 }
} else {
1
}) as usize
}
fn comp_ref_ctx(&self, b: &Blk) -> usize {
let h = self.h;
let fix_ref_idx = h.ref_frame_sign_bias[h.comp_fixed_ref as usize] as usize;
let var_ref_idx = 1 - fix_ref_idx;
let var0 = h.comp_var_ref[0];
let var1 = h.comp_var_ref[1];
let fixed = h.comp_fixed_ref;
(if b.avail_u && b.avail_l {
if b.above_intra && b.left_intra {
2
} else if b.left_intra {
if b.above_single { 1 + 2 * (b.above_ref[0] != var1) as u8 } else { 1 + 2 * (b.above_ref[var_ref_idx] != var1) as u8 }
} else if b.above_intra {
if b.left_single { 1 + 2 * (b.left_ref[0] != var1) as u8 } else { 1 + 2 * (b.left_ref[var_ref_idx] != var1) as u8 }
} else {
let vrfa = if b.above_single { b.above_ref[0] } else { b.above_ref[var_ref_idx] };
let vrfl = if b.left_single { b.left_ref[0] } else { b.left_ref[var_ref_idx] };
if vrfa == vrfl && var1 == vrfa {
0
} else if b.left_single && b.above_single {
if (vrfa == fixed && vrfl == var0) || (vrfl == fixed && vrfa == var0) {
4
} else if vrfa == vrfl {
3
} else {
1
}
} else if b.left_single || b.above_single {
let vrfc = if b.left_single { vrfa } else { vrfl };
let rfs = if b.above_single { vrfa } else { vrfl };
if vrfc == var1 && rfs != var1 {
1
} else if rfs == var1 && vrfc != var1 {
2
} else {
4
}
} else if vrfa == vrfl {
4
} else {
2
}
}
} else if b.avail_u {
if b.above_intra {
2
} else if b.above_single {
3 * (b.above_ref[0] != var1) as u8
} else {
4 * (b.above_ref[var_ref_idx] != var1) as u8
}
} else if b.avail_l {
if b.left_intra {
2
} else if b.left_single {
3 * (b.left_ref[0] != var1) as u8
} else {
4 * (b.left_ref[var_ref_idx] != var1) as u8
}
} else {
2
}) as usize
}
fn single_ref_p1_ctx(&self, b: &Blk) -> usize {
let (a, l) = (b.above_ref, b.left_ref);
(if b.avail_u && b.avail_l {
if b.above_intra && b.left_intra {
2
} else if b.left_intra {
if b.above_single { 4 * (a[0] == LAST_FRAME) as u8 } else { 1 + (a[0] == LAST_FRAME || a[1] == LAST_FRAME) as u8 }
} else if b.above_intra {
if b.left_single { 4 * (l[0] == LAST_FRAME) as u8 } else { 1 + (l[0] == LAST_FRAME || l[1] == LAST_FRAME) as u8 }
} else if b.above_single && b.left_single {
2 * (a[0] == LAST_FRAME) as u8 + 2 * (l[0] == LAST_FRAME) as u8
} else if !b.above_single && !b.left_single {
1 + (a[0] == LAST_FRAME || a[1] == LAST_FRAME || l[0] == LAST_FRAME || l[1] == LAST_FRAME) as u8
} else {
let rfs = if b.above_single { a[0] } else { l[0] };
let crf1 = if b.above_single { l[0] } else { a[0] };
let crf2 = if b.above_single { l[1] } else { a[1] };
if rfs == LAST_FRAME { 3 + (crf1 == LAST_FRAME || crf2 == LAST_FRAME) as u8 } else { (crf1 == LAST_FRAME || crf2 == LAST_FRAME) as u8 }
}
} else if b.avail_u {
if b.above_intra {
2
} else if b.above_single {
4 * (a[0] == LAST_FRAME) as u8
} else {
1 + (a[0] == LAST_FRAME || a[1] == LAST_FRAME) as u8
}
} else if b.avail_l {
if b.left_intra {
2
} else if b.left_single {
4 * (l[0] == LAST_FRAME) as u8
} else {
1 + (l[0] == LAST_FRAME || l[1] == LAST_FRAME) as u8
}
} else {
2
}) as usize
}
fn single_ref_p2_ctx(&self, b: &Blk) -> usize {
let (a, l) = (b.above_ref, b.left_ref);
const G: i8 = GOLDEN_FRAME;
const L: i8 = LAST_FRAME;
(if b.avail_u && b.avail_l {
if b.above_intra && b.left_intra {
2
} else if b.left_intra {
if b.above_single { if a[0] == L { 3 } else { 4 * (a[0] == G) as u8 } } else { 1 + 2 * (a[0] == G || a[1] == G) as u8 }
} else if b.above_intra {
if b.left_single { if l[0] == L { 3 } else { 4 * (l[0] == G) as u8 } } else { 1 + 2 * (l[0] == G || l[1] == G) as u8 }
} else if b.above_single && b.left_single {
if a[0] == L && l[0] == L {
3
} else if a[0] == L {
4 * (l[0] == G) as u8
} else if l[0] == L {
4 * (a[0] == G) as u8
} else {
2 * (a[0] == G) as u8 + 2 * (l[0] == G) as u8
}
} else if !b.above_single && !b.left_single {
if a[0] == l[0] && a[1] == l[1] { 3 * (a[0] == G || a[1] == G) as u8 } else { 2 }
} else {
let rfs = if b.above_single { a[0] } else { l[0] };
let crf1 = if b.above_single { l[0] } else { a[0] };
let crf2 = if b.above_single { l[1] } else { a[1] };
if rfs == G {
3 + (crf1 == G || crf2 == G) as u8
} else if rfs == ALTREF_FRAME {
(crf1 == G || crf2 == G) as u8
} else {
1 + 2 * (crf1 == G || crf2 == G) as u8
}
}
} else if b.avail_u {
if b.above_intra || (a[0] == L && b.above_single) {
2
} else if b.above_single {
4 * (a[0] == G) as u8
} else {
3 * (a[0] == G || a[1] == G) as u8
}
} else if b.avail_l {
if b.left_intra || (l[0] == L && b.left_single) {
2
} else if b.left_single {
4 * (l[0] == G) as u8
} else {
3 * (l[0] == G || l[1] == G) as u8
}
} else {
2
}) as usize
}
/// assign_mv (6.4.18): returns Mv[0..2].
fn assign_mv(&mut self, bd: &mut BoolDecoder, b: &Blk, is_compound: bool) -> [Mv; 2] {
let mut mv = [Mv::ZERO; 2];
for i in 0..1 + is_compound as usize {
mv[i] = match b.y_mode {
NEWMV => self.read_mv(bd, i),
NEARESTMV => self.nearest_mv[i],
NEARMV => self.near_mv[i],
_ => Mv::ZERO,
};
}
mv
}
fn read_mv(&mut self, bd: &mut BoolDecoder, r: usize) -> Mv {
let use_hp = self.h.allow_high_precision_mv && use_mv_hp(self.best_mv[r]);
let joint = bd.read_tree(&MV_JOINT_TREE, &self.fc.mv_joint);
if self.s.counting {
self.strip.counts.mv_joint[joint as usize] += 1;
}
let mut diff = [0i32; 2];
if joint == 2 || joint == 3 {
diff[0] = self.read_mv_component(bd, 0, use_hp);
}
if joint == 1 || joint == 3 {
diff[1] = self.read_mv_component(bd, 1, use_hp);
}
Mv::new(self.best_mv[r].row as i32 + diff[0], self.best_mv[r].col as i32 + diff[1])
}
fn read_mv_component(&mut self, bd: &mut BoolDecoder, comp: usize, use_hp: bool) -> i32 {
let fc = self.fc;
let counting = self.s.counting;
let counts = &mut self.strip.counts;
let sign = bd.read_bool(fc.mv_sign[comp]);
let class = bd.read_tree(&MV_CLASS_TREE, &fc.mv_class[comp]) as usize;
let mag = if class == 0 {
let c0 = bd.read_bool(fc.mv_class0_bit[comp]) as usize;
let fr = bd.read_tree(&MV_FR_TREE, &fc.mv_class0_fr[comp][c0]) as usize;
let hp = if use_hp { bd.read_bool(fc.mv_class0_hp[comp]) as usize } else { 1 };
if counting {
counts.mv_class0_bit[comp][c0] += 1;
counts.mv_class0_fr[comp][c0][fr] += 1;
counts.mv_class0_hp[comp][hp] += 1;
}
((c0 << 3) | (fr << 1) | hp) + 1
} else {
let mut d = 0usize;
for i in 0..class {
let bit = bd.read_bool(fc.mv_bits[comp][i]) as usize;
if counting {
counts.mv_bits[comp][i][bit] += 1;
}
d |= bit << i;
}
let base = 2usize << (class + 2);
let fr = bd.read_tree(&MV_FR_TREE, &fc.mv_fr[comp]) as usize;
let hp = if use_hp { bd.read_bool(fc.mv_hp[comp]) as usize } else { 1 };
if counting {
counts.mv_fr[comp][fr] += 1;
counts.mv_hp[comp][hp] += 1;
}
base + ((d << 3) | (fr << 1) | hp) + 1
};
if counting {
counts.mv_sign[comp][sign as usize] += 1;
counts.mv_class[comp][class] += 1;
}
if sign { -(mag as i32) } else { mag as i32 }
}
// ------------------------------------------------------------ motion vector prediction (6.5)
#[inline]
fn is_inside(&self, r: isize, c: isize) -> bool {
r >= 0 && (r as usize) < self.mi_rows && c >= self.strip.mi_col_start as isize && (c as usize) < self.strip.mi_col_end
}
#[inline]
fn add_mv_ref_list(&mut self, mv: Mv) {
if self.ref_mv_count >= 2 {
return;
}
if self.ref_mv_count > 0 && mv == self.ref_list_mv[0] {
return;
}
self.ref_list_mv[self.ref_mv_count] = mv;
self.ref_mv_count += 1;
}
fn if_same_ref_frame_add(&mut self, m: &MiInfo, ref_frame: i8) {
for j in 0..2 {
if m.ref_frame[j] == ref_frame {
self.add_mv_ref_list(m.mv[j][3]);
return;
}
}
}
fn if_diff_ref_frame_add(&mut self, m: &MiInfo, ref_frame: i8) {
let bias = &self.h.ref_frame_sign_bias;
let mvs = [m.mv[0][3], m.mv[1][3]];
let same = mvs[0] == mvs[1];
let scale = |f: i8, mv: Mv| -> Mv { if bias[f as usize] != bias[ref_frame as usize] { Mv::new(-(mv.row as i32), -(mv.col as i32)) } else { mv } };
if m.ref_frame[0] > INTRA_FRAME && m.ref_frame[0] != ref_frame {
let mv = scale(m.ref_frame[0], mvs[0]);
self.add_mv_ref_list(mv);
}
if m.ref_frame[1] > INTRA_FRAME && m.ref_frame[1] != ref_frame && !same {
let mv = scale(m.ref_frame[1], mvs[1]);
self.add_mv_ref_list(mv);
}
}
fn clamp_mv_row(&self, b: &Blk, v: i32, border: i32) -> i32 {
let bh = NUM_8X8_HIGH[b.size as usize] as i32;
let to_top = -((b.r as i32 * 8) * 8);
let to_bottom = ((self.mi_rows as i32 - bh - b.r as i32) * 8) * 8;
v.clamp(to_top - border, (to_bottom + border).max(to_top - border))
}
fn clamp_mv_col(&self, b: &Blk, v: i32, border: i32) -> i32 {
let bw = NUM_8X8_WIDE[b.size as usize] as i32;
let to_left = -((b.c as i32 * 8) * 8);
let to_right = ((self.mi_cols as i32 - bw - b.c as i32) * 8) * 8;
v.clamp(to_left - border, (to_right + border).max(to_left - border))
}
/// find_mv_refs (6.5.1) for `ref_frame`; `block` is -1 or the sub-8x8 block index.
fn find_mv_refs(&mut self, b: &Blk, ref_frame: i8, block: i32) {
self.ref_mv_count = 0;
self.ref_list_mv = [Mv::ZERO; 2];
let mut different_ref_found = false;
let mut context_counter = 0usize;
let search = &MV_REF_BLOCKS[b.size as usize * 16..b.size as usize * 16 + 16];
let (r, c) = (b.r as isize, b.c as isize);
for i in 0..2 {
let (cr, cc) = (r + search[i * 2] as isize, c + search[i * 2 + 1] as isize);
if self.is_inside(cr, cc) {
let m = *self.mi_at(cr as usize, cc as usize);
different_ref_found = true;
context_counter += MODE_2_COUNTER[m.y_mode as usize] as usize;
for j in 0..2 {
if m.ref_frame[j] == ref_frame {
let idx = if block >= 0 { IDX_N_COLUMN_TO_SUBBLOCK[block as usize][(search[i * 2 + 1] == 0) as usize] as usize } else { 3 };
self.add_mv_ref_list(m.mv[j][idx]);
break;
}
}
}
}
for i in 2..8 {
let (cr, cc) = (r + search[i * 2] as isize, c + search[i * 2 + 1] as isize);
if self.is_inside(cr, cc) {
different_ref_found = true;
let m = *self.mi_at(cr as usize, cc as usize);
self.if_same_ref_frame_add(&m, ref_frame);
}
}
let prev = self.s.prev_mi.map(|g| *g.at(b.r, b.c));
if let Some(p) = &prev {