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use nihav_core::codecs::*;
use nihav_core::io::byteio::*;
struct Palette {
data: [u8; 1024],
}
impl Default for Palette {
fn default() -> Self {
Self { data: [0; 1024] }
}
}
impl Palette {
fn read_data(&mut self, src: &[u8]) {
for (dst, src) in self.data.chunks_exact_mut(4).zip(src.chunks_exact(4)) {
let clr = read_u32le(src).unwrap();
let r = (clr & 0x1F) as u8;
dst[0] = (r << 3) | (r >> 2);
let g = ((clr >> 5) & 0x1F) as u8;
dst[1] = (g << 3) | (g >> 2);
let b = ((clr >> 10) & 0x1F) as u8;
dst[2] = (b << 3) | (b >> 2);
dst[3] = 0;
}
}
fn get_side_data(&self) -> NASideData {
NASideData::Palette(true, Arc::new(self.data))
}
}
#[derive(Default)]
struct WssPacketiser {
stream: Option<NAStreamRef>,
buf: Vec<u8>,
csizes: Vec<usize>,
frameno: u32,
frame_size: usize,
palette: Palette,
pal_mode: bool,
has_pal: bool,
}
impl WssPacketiser {
fn new() -> Self { Self::default() }
fn remove_payload(&mut self, size: usize) {
self.buf.drain(..size);
if !self.csizes.is_empty() {
if self.csizes[0] >= size {
self.csizes[0] -= size;
// skip possible padding at the end of chunk
if self.csizes[0] == 1 {
self.buf.remove(0);
self.csizes[0] -= 1;
}
if self.csizes[0] == 0 {
self.csizes.remove(0);
}
} else {
println!("ran past input chunk end!");
self.csizes.clear();
}
}
}
}
impl NAPacketiser for WssPacketiser {
fn attach_stream(&mut self, stream: NAStreamRef) {
self.stream = Some(stream);
}
fn add_data(&mut self, src: &[u8]) -> bool {
self.csizes.push(src.len());
self.buf.extend_from_slice(src);
self.buf.len() < (1 << 10)
}
fn parse_stream(&mut self, id: u32) -> DecoderResult<NAStreamRef> {
if let Some(ref stream) = self.stream {
let mut stream = NAStream::clone(stream);
stream.id = id;
Ok(stream.into_ref())
} else {
Err(DecoderError::MissingReference)
}
}
fn skip_junk(&mut self) -> DecoderResult<usize> {
Err(DecoderError::NotImplemented)
}
fn get_packet(&mut self, stream: NAStreamRef) -> DecoderResult<Option<NAPacket>> {
loop {
if self.buf.len() < 4 || self.buf.len() < self.frame_size {
return Ok(None);
}
if self.frame_size == 0 {
self.frame_size = read_u32le(&self.buf)? as usize;
if self.frame_size == 0 {
self.remove_payload(4);
self.frameno += 1;
continue;
}
if self.frame_size == 0xFFFFFFFF {
self.pal_mode = true;
self.frame_size = 1024;
}
self.frame_size += 4;
validate!(self.frame_size > 16);
if self.buf.len() >= self.frame_size {
if self.pal_mode {
self.palette.read_data(&self.buf[4..][..1024]);
self.remove_payload(self.frame_size);
self.pal_mode = false;
self.has_pal = true;
self.frame_size = 0;
continue;
}
break;
}
}
}
let mut data = Vec::with_capacity(self.frame_size);
data.extend_from_slice(&self.buf[16..self.frame_size]);
self.remove_payload(self.frame_size);
let mut is_intra = false;
if let Some(ref stream) = self.stream {
#[allow(clippy::single_match)]
match stream.get_info().get_name() {
"cinepak" => is_intra = (data[0] & 1) == 0,
_ => {},
};
}
let ts = NATimeInfo::new(Some(u64::from(self.frameno)), None, None, stream.tb_num, stream.tb_den);
self.frameno += 1;
self.frame_size = 0;
let mut pkt = NAPacket::new(stream, ts, is_intra, data);
if self.has_pal {
pkt.add_side_data(self.palette.get_side_data());
}
Ok(Some(pkt))
}
fn reset(&mut self) {
self.buf.clear();
}
fn bytes_left(&self) -> usize { self.buf.len() }
}
#[cfg(feature="packetiser_cinepak")]
pub fn get_packetiser_cinepak() -> Box<dyn NAPacketiser + Send> {
Box::new(WssPacketiser::new())
}
#[cfg(feature="packetiser_msvideo1")]
pub fn get_packetiser_msvideo1() -> Box<dyn NAPacketiser + Send> {
Box::new(WssPacketiser::new())
}
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