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|
use nihav_core::frame::*;
use nihav_core::io::byteio::*;
use nihav_core::demuxers::*;
use nihav_core::formats::YUV420_FORMAT;
struct RawH264Demuxer<'a> {
src: &'a mut ByteReader<'a>,
cur_frame: u64,
frame_buf: Vec<u8>,
}
fn read_nal(src: &mut ByteReader, dst: &mut Vec<u8>) -> DemuxerResult<()> {
dst.clear();
loop {
let b = src.read_byte()?;
if b == 0 {
let b2 = src.read_byte()?;
if b2 == 0 {
let b3 = src.read_byte()?;
if b3 == 0 {
while src.read_byte()? != 1 { }
break;
} else if b3 == 1 {
break;
} else {
dst.push(b);
dst.push(b2);
dst.push(b3);
}
} else {
dst.push(b);
dst.push(b2);
}
} else {
dst.push(b);
}
}
Ok(())
}
fn put_nal(dst: &mut Vec<u8>, src: &[u8]) {
let len = src.len();
dst.push((len >> 24) as u8);
dst.push((len >> 16) as u8);
dst.push((len >> 8) as u8);
dst.push( len as u8);
dst.extend_from_slice(src);
}
impl<'a> DemuxCore<'a> for RawH264Demuxer<'a> {
#[allow(clippy::unreadable_literal)]
fn open(&mut self, strmgr: &mut StreamManager, _seek_idx: &mut SeekIndex) -> DemuxerResult<()> {
let src = &mut self.src;
while src.read_byte()? != 1 { }
let mut edata: Vec<u8> = Vec::with_capacity(64);
let mut num_sps = 0;
let mut sps_buf = Vec::new();
let mut num_pps = 0;
let mut pps_buf = Vec::new();
let mut profile = 0;
let mut level = 0;
let mut nal_buf = Vec::with_capacity(65536);
loop {
read_nal(src, &mut nal_buf)?;
if !nal_buf.is_empty() {
let nal_type = nal_buf[0] & 0x1F;
match nal_type {
7 => {
if nal_buf.len() < 4 {
return Err(DemuxerError::InvalidData);
}
profile = nal_buf[1];
level = nal_buf[3];
sps_buf.push((nal_buf.len() >> 8) as u8);
sps_buf.push(nal_buf.len() as u8);
sps_buf.extend_from_slice(&nal_buf);
num_sps += 1;
},
8 => {
pps_buf.push((nal_buf.len() >> 8) as u8);
pps_buf.push(nal_buf.len() as u8);
pps_buf.extend_from_slice(&nal_buf);
num_pps += 1;
},
1 | 5 => {
self.frame_buf = nal_buf;
break;
},
_ => {},
};
}
}
if num_sps == 0 || num_pps == 0 {
return Err(DemuxerError::InvalidData);
}
edata.extend_from_slice(b"avcC");
edata.push(1);
edata.push(profile);
edata.push(0);
edata.push(level);
edata.push(0xFF);
edata.push(0xE0 | num_sps);
edata.extend_from_slice(&sps_buf);
edata.push(num_pps);
edata.extend_from_slice(&pps_buf);
let width = 16;
let height = 16;
let vhdr = NAVideoInfo::new(width, height, false, YUV420_FORMAT);
let vinfo = NACodecInfo::new("h264", NACodecTypeInfo::Video(vhdr), Some(edata));
if let None = strmgr.add_stream(NAStream::new(StreamType::Video, 0, vinfo, 1, 25, 0)) {
return Err(DemuxerError::InvalidData);
}
self.cur_frame = 0;
Ok(())
}
fn get_frame(&mut self, strmgr: &mut StreamManager) -> DemuxerResult<NAPacket> {
let ts = NATimeInfo::new(Some(self.cur_frame), None, None, 1, 25);
let mut buf: Vec<u8> = Vec::with_capacity(65536);
if !self.frame_buf.is_empty() {
put_nal(&mut buf, &self.frame_buf);
self.frame_buf.clear();
}
let strres = strmgr.get_stream(0);
if strres.is_none() {
return Err(DemuxerError::InvalidData);
}
let stream = strres.unwrap();
let mut keyframe = false;
let mut nal_buf = Vec::with_capacity(65536);
let mut is_eof = false;
while !is_eof {
match read_nal(&mut self.src, &mut nal_buf) {
Ok(()) => {},
Err(DemuxerError::IOError) => { is_eof = true; },
Err(err) => return Err(err),
};
if !nal_buf.is_empty() {
let nal_type = nal_buf[0] & 0x1F;
keyframe = nal_type == 5;
match nal_type {
1 | 5 => {
let first_slice = (nal_buf[1] & 0x80) != 0;
if first_slice && !buf.is_empty() {
self.frame_buf.extend_from_slice(&nal_buf);
break;
} else {
put_nal(&mut buf, &nal_buf);
}
},
_ => {
//println!("non-slice NAL {} @ {:X}", nal_type, self.src.tell());
put_nal(&mut buf, &nal_buf);
},
};
}
}
if is_eof && buf.is_empty() {
return Err(DemuxerError::EOF);
}
let pkt = NAPacket::new(stream, ts, keyframe, buf);
self.cur_frame += 1;
Ok(pkt)
}
fn seek(&mut self, _time: NATimePoint, _seek_idx: &SeekIndex) -> DemuxerResult<()> {
Err(DemuxerError::NotImplemented)
}
fn get_duration(&self) -> u64 { 0 }
}
impl<'a> NAOptionHandler for RawH264Demuxer<'a> {
fn get_supported_options(&self) -> &[NAOptionDefinition] { &[] }
fn set_options(&mut self, _options: &[NAOption]) { }
fn query_option_value(&self, _name: &str) -> Option<NAValue> { None }
}
impl<'a> RawH264Demuxer<'a> {
fn new(io: &'a mut ByteReader<'a>) -> Self {
RawH264Demuxer {
src: io,
cur_frame: 0,
frame_buf: Vec::new(),
}
}
}
pub struct RawH264DemuxerCreator { }
impl DemuxerCreator for RawH264DemuxerCreator {
fn new_demuxer<'a>(&self, br: &'a mut ByteReader<'a>) -> Box<dyn DemuxCore<'a> + 'a> {
Box::new(RawH264Demuxer::new(br))
}
fn get_name(&self) -> &'static str { "rawh264" }
}
|
