X-Git-Url: https://git.nihav.org/?a=blobdiff_plain;f=nihav-acorn%2Fsrc%2Fcodecs%2Fwss_packetisers.rs;fp=nihav-acorn%2Fsrc%2Fcodecs%2Fwss_packetisers.rs;h=6bdd1a95fffb849c7bed3f4cf647db47f56268b1;hb=e3af9911ad107a09e99c033a74f15c40581b8e26;hp=0000000000000000000000000000000000000000;hpb=495496ba02a782e17314b5c36be98de0ae4a7989;p=nihav.git

diff --git a/nihav-acorn/src/codecs/wss_packetisers.rs b/nihav-acorn/src/codecs/wss_packetisers.rs
new file mode 100644
index 0000000..6bdd1a9
--- /dev/null
+++ b/nihav-acorn/src/codecs/wss_packetisers.rs
@@ -0,0 +1,159 @@
+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())
+}