+use std::collections::VecDeque;
use nihav_core::frame::*;
use nihav_core::muxers::*;
use super::RMStreamWriter;
fn finish(&mut self, _bw: &mut ByteWriter) -> MuxerResult<()> {
Ok(())
}
+ fn set_pkt_size(&mut self, _pkt_size: usize) {}
+}
+
+#[derive(Clone,Copy)]
+enum VideoDataType {
+ Frame,
+ Slice{pkt_no: u8, npkt: u8, full_size: u32, offset: u32},
+}
+
+impl VideoDataType {
+ fn is_frame(self) -> bool { matches!(self, VideoDataType::Frame) }
+}
+
+fn val_to_size(val: u32) -> usize { if val < (1 << 14) { 2 } else { 4 } }
+
+#[derive(Clone)]
+struct VideoData {
+ vtype: VideoDataType,
+ pts: u32,
+ seq_no: u8,
+ data: Vec<u8>,
+}
+
+impl VideoData {
+ fn get_pkt_len(&self) -> usize {
+ let plen = self.data.len();
+ let ts_size = val_to_size(self.pts);
+ match self.vtype {
+ VideoDataType::Frame => plen + val_to_size(plen as u32) + ts_size + 2,
+ VideoDataType::Slice{pkt_no: _, npkt: _, full_size, offset} => plen + val_to_size(full_size) + val_to_size(offset) + 3,
+ }
+ }
}
struct VideoStreamWriter {
fcc: [u8; 4],
- buf: Vec<u8>,
- nslices: usize,
- cur_slice: usize,
seq_no: u8,
time: u32,
mi_time: u32,
+ pkt_size: usize,
+ queue: VecDeque<VideoData>,
+ flush: bool,
}
impl RMStreamWriter for VideoStreamWriter {
Ok(())
}
fn queue_packet(&mut self, pkt: NAPacket, ms: u32) -> bool {
- if self.nslices == 0 {
- let src = pkt.get_buffer();
- let nslices = usize::from(src[0]) + 1;
- if src.len() > nslices * 8 + 1 {
- self.nslices = nslices;
- self.cur_slice = 0;
- self.buf.resize(src.len(), 0);
- self.buf.copy_from_slice(&src);
- self.time = ms;
- if ms > 0 {
- self.mi_time = ms.max(self.mi_time + 1);
- }
+ let tot_size = self.queue.iter().fold(0usize, |acc, q| acc + q.get_pkt_len());
+ if tot_size > self.pkt_size {
+ return false;
+ }
+
+ self.time = ms;
+ if ms > 0 {
+ self.mi_time = ms.max(self.mi_time + 1);
+ }
+
+ let src = pkt.get_buffer();
+ let nslices = usize::from(src[0]) + 1;
+ let hdr_size = nslices * 8 + 1;
+
+ if nslices == 1 {
+ self.queue.push_back(VideoData {
+ vtype: VideoDataType::Frame,
+ pts: self.mi_time,
+ seq_no: self.seq_no,
+ data: src[9..].to_vec(),
+ });
+ } else if src.len() > hdr_size {
+ let mut slice_sizes = [0; 256];
+ let mut slice_offs = [0; 256];
+
+ for (el, src) in slice_offs.iter_mut().zip(src[1..].chunks_exact(8)) {
+ *el = read_u32be(&src[4..]).unwrap() as usize;
+ }
+ for (dst, offs) in slice_sizes[..nslices - 1].iter_mut().zip(slice_offs.windows(2)) {
+ *dst = offs[1] - offs[0];
+ }
+ slice_sizes[nslices - 1] = src.len() - hdr_size - slice_offs[nslices - 1];
+
+ let src = &src[hdr_size..];
+ let full_size = src.len() as u32;
+ let npkt = nslices as u8;
+ for (pkt_no, (&offset, &size)) in slice_offs.iter().zip(slice_sizes.iter()).take(nslices).enumerate() {
+ let vtype = VideoDataType::Slice{pkt_no: (pkt_no + 1) as u8, npkt, full_size, offset: offset as u32};
+ self.queue.push_back(VideoData {
+ vtype,
+ pts: self.mi_time,
+ seq_no: self.seq_no,
+ data: src[offset..][..size].to_vec(),
+ });
}
- true
- } else {
- false
}
+
+ self.seq_no = self.seq_no.wrapping_add(1);
+
+ true
}
fn get_packet(&mut self) -> Option<(Vec<u8>, u32, bool)> {
- if self.cur_slice < self.nslices {
- let first = self.cur_slice == 0;
- let hdr_size = self.nslices * 8 + 1;
- let cur_off = (read_u32be(&self.buf[self.cur_slice * 8 + 5..]).unwrap_or(0) as usize) + hdr_size;
- let next_off = if self.cur_slice + 1 < self.nslices {
- (read_u32be(&self.buf[self.cur_slice * 8 + 13..]).unwrap_or(0) as usize) + hdr_size
- } else {
- self.buf.len()
- };
- let next_off = next_off.max(cur_off);
- let src = &self.buf[cur_off..next_off];
- let ret = if self.nslices == 1 {
- let mut dst = vec![0; src.len() + 2];
- dst[0] = 0x40;
- dst[1] = self.seq_no;
- dst[2..].copy_from_slice(src);
- dst
- } else {
- let mut dst = Vec::with_capacity(src.len() + 11);
- let mut gw = GrowableMemoryWriter::new_write(&mut dst);
- let mut bw = ByteWriter::new(&mut gw);
-
- let hdr = ((self.nslices as u16) << 7) | ((self.cur_slice + 1) as u16);
- bw.write_u16be(hdr).unwrap();
-
- let full_size = self.buf.len() - hdr_size;
- if full_size < (1 << 14) {
- bw.write_u16be(0xC000 | (full_size as u16)).unwrap();
- } else {
- bw.write_u32be(0x80000000 | (full_size as u32)).unwrap();
+ if self.queue.is_empty() {
+ return None;
+ }
+ let tot_size = self.queue.iter().fold(0usize, |acc, q| acc + q.get_pkt_len());
+ if tot_size < self.pkt_size && !self.flush {
+ return None;
+ }
+ let mut pkt_buf = Vec::new();
+
+ let first = self.queue.pop_front().unwrap();
+ let is_first = match first.vtype {
+ VideoDataType::Frame => true,
+ VideoDataType::Slice{pkt_no, npkt: _, full_size: _, offset: _} => pkt_no == 1,
+ };
+ if self.queue.is_empty() || (first.get_pkt_len() + self.queue[0].get_pkt_len() + 4 > self.pkt_size) {
+ match first.vtype {
+ VideoDataType::Frame => {
+ pkt_buf.push(0x40); // 0x1 = whole frame
+ pkt_buf.push(first.seq_no);
+ pkt_buf.extend_from_slice(&first.data);
+ },
+ VideoDataType::Slice{pkt_no, npkt, full_size: _, offset: _} => {
+ let id = if pkt_no == npkt { 2 } else { 0 };
+ write_slice(&mut pkt_buf, id, &first);
+ },
+ };
+ } else {
+ let second = &self.queue[0];
+ match (first.vtype.is_frame(), second.vtype.is_frame()) {
+ (true, true) => {
+ write_multiple_frame(&mut pkt_buf, &first);
+ while !self.queue.is_empty() && self.queue[0].vtype.is_frame() && (pkt_buf.len() + self.queue[0].get_pkt_len() < self.pkt_size) {
+ let frm = self.queue.pop_front().unwrap();
+ write_multiple_frame(&mut pkt_buf, &frm);
+ }
+ },
+ (true, false) => {
+ pkt_buf.push(0x40); // 0x1 = whole frame
+ pkt_buf.push(first.seq_no);
+ pkt_buf.extend_from_slice(&first.data);
+ },
+ (false, true) => {
+ write_slice(&mut pkt_buf, 2, &first);
+ while !self.queue.is_empty() && self.queue[0].vtype.is_frame() && (pkt_buf.len() + self.queue[0].get_pkt_len() < self.pkt_size) {
+ let frm = self.queue.pop_front().unwrap();
+ write_multiple_frame(&mut pkt_buf, &frm);
}
- let coff = cur_off - hdr_size;
- if coff < (1 << 14) {
- bw.write_u16be(0x4000 | (coff as u16)).unwrap();
+ },
+ (false, false) => {
+ if let VideoDataType::Slice{pkt_no, npkt, full_size: _, offset: _} = first.vtype {
+ let id = if pkt_no == npkt { 2 } else { 0 };
+ write_slice(&mut pkt_buf, id, &first);
} else {
- bw.write_u32be(coff as u32).unwrap();
+ unreachable!()
}
- bw.write_byte(self.seq_no).unwrap();
- bw.write_buf(src).unwrap();
- dst
- };
- self.cur_slice += 1;
- if self.cur_slice == self.nslices {
- self.nslices = 0;
- self.cur_slice = 0;
- self.seq_no = self.seq_no.wrapping_add(1);
- }
- Some((ret, self.mi_time, first))
- } else {
- None
+ },
+ };
}
+ Some((pkt_buf, first.pts, is_first))
+ }
+ fn flush(&mut self) {
+ self.flush = true;
}
- fn flush(&mut self) { }
fn finish(&mut self, _bw: &mut ByteWriter) -> MuxerResult<()> {
Ok(())
}
+ fn set_pkt_size(&mut self, pkt_size: usize) {
+ self.pkt_size = pkt_size;
+ }
+}
+
+fn write_16_or_32(dst: &mut Vec<u8>, val: u32) {
+ if val < (1 << 14) {
+ dst.push((1 << 6) | ((val >> 8) as u8));
+ dst.push(val as u8);
+ } else {
+ dst.push((val >> 24) as u8);
+ dst.push((val >> 16) as u8);
+ dst.push((val >> 8) as u8);
+ dst.push( val as u8);
+ }
+}
+
+fn write_multiple_frame(dst: &mut Vec<u8>, frm: &VideoData) {
+ dst.push(0xC0); // 0x3 = multiple frame
+ write_16_or_32(dst, frm.data.len() as u32);
+ write_16_or_32(dst, frm.pts as u32);
+ dst.push(frm.seq_no);
+ dst.extend_from_slice(&frm.data);
+}
+
+fn write_slice(dst: &mut Vec<u8>, id: u8, src: &VideoData) {
+ if let VideoDataType::Slice{pkt_no, npkt, full_size, offset} = src.vtype {
+ dst.push((id << 6) | (npkt >> 1));
+ dst.push((npkt << 7) | pkt_no);
+ write_16_or_32(dst, full_size);
+ if id == 0 {
+ write_16_or_32(dst, offset);
+ } else {
+ write_16_or_32(dst, src.data.len() as u32);
+ }
+ dst.push(src.seq_no);
+ dst.extend_from_slice(&src.data);
+ } else {
+ unreachable!()
+ }
}
-pub fn create_video_stream(stream: &NAStream) -> MuxerResult<Box<dyn RMStreamWriter>> {
+pub fn create_video_stream(stream: &NAStream, pkt_size: usize) -> MuxerResult<Box<dyn RMStreamWriter>> {
let info = stream.get_info();
let cname = info.get_name();
if name == cname {
return Ok(Box::new(VideoStreamWriter {
fcc: *fcc,
- buf: Vec::new(),
- nslices: 0,
- cur_slice: 0,
seq_no: 0,
time: 0,
mi_time: 0,
+ pkt_size,
+ queue: VecDeque::new(),
+ flush: false,
}));
}
}
projects / nihav.git / blobdiff