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|
//! Various pixel block manipulation functions.
use crate::frame::*;
/// Puts YUV420 16x16 macroblock data onto picture in the requested place.
pub fn put_blocks(buf: &mut NAVideoBuffer<u8>, xpos: usize, ypos: usize, blk: &[[i16;64]; 6]) {
let stridey = buf.get_stride(0);
let strideu = buf.get_stride(1);
let stridev = buf.get_stride(2);
let mut idxy = buf.get_offset(0) + xpos * 16 + ypos * 16 * stridey;
let mut idxu = buf.get_offset(1) + xpos * 8 + ypos * 8 * strideu;
let mut idxv = buf.get_offset(2) + xpos * 8 + ypos * 8 * stridev;
let data = buf.get_data_mut().unwrap();
let framebuf: &mut [u8] = data.as_mut_slice();
for j in 0..8 {
for k in 0..8 {
let mut v = blk[0][k + j * 8];
if v < 0 { v = 0; } else if v > 255 { v = 255; }
framebuf[idxy + k] = v as u8;
}
for k in 0..8 {
let mut v = blk[1][k + j * 8];
if v < 0 { v = 0; } else if v > 255 { v = 255; }
framebuf[idxy + k + 8] = v as u8;
}
idxy += stridey;
}
for j in 0..8 {
for k in 0..8 {
let mut v = blk[2][k + j * 8];
if v < 0 { v = 0; } else if v > 255 { v = 255; }
framebuf[idxy + k] = v as u8;
}
for k in 0..8 {
let mut v = blk[3][k + j * 8];
if v < 0 { v = 0; } else if v > 255 { v = 255; }
framebuf[idxy + k + 8] = v as u8;
}
idxy += stridey;
}
for j in 0..8 {
for k in 0..8 {
let mut v = blk[4][k + j * 8];
if v < 0 { v = 0; } else if v > 255 { v = 255; }
framebuf[idxu + k] = v as u8;
}
for k in 0..8 {
let mut v = blk[5][k + j * 8];
if v < 0 { v = 0; } else if v > 255 { v = 255; }
framebuf[idxv + k] = v as u8;
}
idxu += strideu;
idxv += stridev;
}
}
/// Adds YUV420 16x16 macroblock coefficients to the picture in the requested place.
pub fn add_blocks(buf: &mut NAVideoBuffer<u8>, xpos: usize, ypos: usize, blk: &[[i16;64]; 6]) {
let stridey = buf.get_stride(0);
let strideu = buf.get_stride(1);
let stridev = buf.get_stride(2);
let mut idxy = buf.get_offset(0) + xpos * 16 + ypos * 16 * stridey;
let mut idxu = buf.get_offset(1) + xpos * 8 + ypos * 8 * strideu;
let mut idxv = buf.get_offset(2) + xpos * 8 + ypos * 8 * stridev;
let data = buf.get_data_mut().unwrap();
let framebuf: &mut [u8] = data.as_mut_slice();
for j in 0..8 {
for k in 0..8 {
let mut v = blk[0][k + j * 8] + i16::from(framebuf[idxy + k]);
if v < 0 { v = 0; } else if v > 255 { v = 255; }
framebuf[idxy + k] = v as u8;
}
for k in 0..8 {
let mut v = blk[1][k + j * 8] + i16::from(framebuf[idxy + k + 8]);
if v < 0 { v = 0; } else if v > 255 { v = 255; }
framebuf[idxy + k + 8] = v as u8;
}
idxy += stridey;
}
for j in 0..8 {
for k in 0..8 {
let mut v = blk[2][k + j * 8] + i16::from(framebuf[idxy + k]);
if v < 0 { v = 0; } else if v > 255 { v = 255; }
framebuf[idxy + k] = v as u8;
}
for k in 0..8 {
let mut v = blk[3][k + j * 8] + i16::from(framebuf[idxy + k + 8]);
if v < 0 { v = 0; } else if v > 255 { v = 255; }
framebuf[idxy + k + 8] = v as u8;
}
idxy += stridey;
}
for j in 0..8 {
for k in 0..8 {
let mut v = blk[4][k + j * 8] + i16::from(framebuf[idxu + k]);
if v < 0 { v = 0; } else if v > 255 { v = 255; }
framebuf[idxu + k] = v as u8;
}
for k in 0..8 {
let mut v = blk[5][k + j * 8] + i16::from(framebuf[idxv + k]);
if v < 0 { v = 0; } else if v > 255 { v = 255; }
framebuf[idxv + k] = v as u8;
}
idxu += strideu;
idxv += stridev;
}
}
/// Copies block from the picture with pixels beyond the picture borders being replaced with replicated edge pixels.
pub fn edge_emu(src: &NAVideoBuffer<u8>, xpos: isize, ypos: isize, bw: usize, bh: usize, dst: &mut [u8], dstride: usize, comp: usize) {
let stride = src.get_stride(comp);
let offs = src.get_offset(comp);
let (w, h) = src.get_dimensions(comp);
let data = src.get_data();
let framebuf: &[u8] = data.as_slice();
for y in 0..bh {
let srcy;
if (y as isize) + ypos < 0 { srcy = 0; }
else if (y as isize) + ypos >= (h as isize) { srcy = h - 1; }
else { srcy = ((y as isize) + ypos) as usize; }
for x in 0..bw {
let srcx;
if (x as isize) + xpos < 0 { srcx = 0; }
else if (x as isize) + xpos >= (w as isize) { srcx = w - 1; }
else { srcx = ((x as isize) + xpos) as usize; }
dst[x + y * dstride] = framebuf[offs + srcx + srcy * stride];
}
}
}
/// A generic type for motion interpolation function used by [`copy_blocks`]
///
/// The function expects following parameters:
/// * destination buffer
/// * destination buffer stride
/// * source buffer
/// * source buffer stride
/// * block width
/// * block height
///
/// [`copy_blocks`]: ./fn.copy_blocks.html
pub type BlkInterpFunc = fn(&mut [u8], usize, &[u8], usize, usize, usize);
/// Performs motion compensation on YUV420 macroblock.
///
/// Arguments:
/// * `dx` and `dy` - destination coordinates
/// * `sx` and `sy` - source coordinates
/// * `bw` and `bh` - block dimensions
/// * `preborder` and `postborder` - number of pixels before and after interpolated one used by the interpolation filter.
/// * `mode` - interpolation mode (essentially the index for the `interp` array)
pub fn copy_blocks(dst: &mut NAVideoBuffer<u8>, src: &NAVideoBuffer<u8>,
dx: usize, dy: usize, sx: isize, sy: isize, bw: usize, bh: usize,
preborder: usize, postborder: usize,
mode: usize, interp: &[BlkInterpFunc])
{
let pre = if mode != 0 { preborder as isize } else { 0 };
let post = if mode != 0 { postborder as isize } else { 0 };
let (w, h) = src.get_dimensions(0);
if (sx - pre < 0) || ((sx >> 1) - pre < 0) || (sx + (bw as isize) + post > (w as isize)) ||
(sy - pre < 0) || ((sy >> 1) - pre < 0) || (sy + (bh as isize) + post > (h as isize)) {
let ebuf_stride: usize = 32;
let mut ebuf: Vec<u8> = vec![0; ebuf_stride * (bh + ((pre + post) as usize))];
for comp in 0..3 {
let dstride = dst.get_stride(comp);
let doff = dst.get_offset(comp);
let ddta = dst.get_data_mut().unwrap();
let dbuf: &mut [u8] = ddta.as_mut_slice();
let x = if comp > 0 { dx/2 } else { dx };
let y = if comp > 0 { dy/2 } else { dy };
let sx_ = (if comp > 0 { sx >> 1 } else { sx }) - pre;
let sy_ = (if comp > 0 { sy >> 1 } else { sy }) - pre;
let bw_ = (if comp > 0 { bw/2 } else { bw }) + ((pre + post) as usize);
let bh_ = (if comp > 0 { bh/2 } else { bh }) + ((pre + post) as usize);
edge_emu(src, sx_ - pre, sy_ - pre, bw_, bh_,
ebuf.as_mut_slice(), ebuf_stride, comp);
let bw_ = if comp > 0 { bw/2 } else { bw };
let bh_ = if comp > 0 { bh/2 } else { bh };
(interp[mode])(&mut dbuf[doff + x + y * dstride..], dstride, ebuf.as_slice(), ebuf_stride, bw_, bh_);
}
} else {
for comp in 0..3 {
let sstride = src.get_stride(comp);
let soff = src.get_offset(comp);
let sdta = src.get_data();
let sbuf: &[u8] = sdta.as_slice();
let dstride = dst.get_stride(comp);
let doff = dst.get_offset(comp);
let ddta = dst.get_data_mut().unwrap();
let dbuf: &mut [u8] = ddta.as_mut_slice();
let x = if comp > 0 { dx/2 } else { dx };
let y = if comp > 0 { dy/2 } else { dy };
let sx_ = ((if comp > 0 { sx >> 1 } else { sx }) - pre) as usize;
let sy_ = ((if comp > 0 { sy >> 1 } else { sy }) - pre) as usize;
let bw_ = if comp > 0 { bw/2 } else { bw };
let bh_ = if comp > 0 { bh/2 } else { bh };
(interp[mode])(&mut dbuf[doff + x + y * dstride..], dstride, &sbuf[(soff + sx_ + sy_ * sstride)..], sstride, bw_, bh_);
}
}
}
/// Performs motion compensation on arbitrary block on some plane.
///
/// See [`copy_blocks`] for the arguments explanation.
///
/// [`copy_blocks`]: ./fn.copy_blocks.html
pub fn copy_block(dst: &mut NASimpleVideoFrame<u8>, src: NAVideoBufferRef<u8>, comp: usize,
dx: usize, dy: usize, mv_x: i16, mv_y: i16, bw: usize, bh: usize,
preborder: usize, postborder: usize,
mode: usize, interp: &[BlkInterpFunc])
{
let pre = if mode != 0 { preborder as isize } else { 0 };
let post = if mode != 0 { postborder as isize } else { 0 };
let (w, h) = src.get_dimensions(comp);
let sx = (dx as isize) + (mv_x as isize);
let sy = (dy as isize) + (mv_y as isize);
if (sx - pre < 0) || (sx + (bw as isize) + post > (w as isize)) ||
(sy - pre < 0) || (sy + (bh as isize) + post > (h as isize)) {
let ebuf_stride: usize = 32;
let mut ebuf: Vec<u8> = vec![0; ebuf_stride * (bh + ((pre + post) as usize))];
let dstride = dst.stride[comp];
let doff = dst.offset[comp];
let edge = (pre + post) as usize;
edge_emu(&src, sx - pre, sy - pre, bw + edge, bh + edge,
ebuf.as_mut_slice(), ebuf_stride, comp);
(interp[mode])(&mut dst.data[doff + dx + dy * dstride..], dstride,
ebuf.as_slice(), ebuf_stride, bw, bh);
} else {
let sstride = src.get_stride(comp);
let soff = src.get_offset(comp);
let sdta = src.get_data();
let sbuf: &[u8] = sdta.as_slice();
let dstride = dst.stride[comp];
let doff = dst.offset[comp];
let saddr = soff + ((sx - pre) as usize) + ((sy - pre) as usize) * sstride;
(interp[mode])(&mut dst.data[doff + dx + dy * dstride..], dstride,
&sbuf[saddr..], sstride, bw, bh);
}
}
|
