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use h264_reader::annexb::AnnexBReader;
use h264_reader::nal::pps::PicParameterSet;
use h264_reader::nal::sei::buffering_period::BufferingPeriod;
use h264_reader::nal::sei::pic_timing::PicTiming;
use h264_reader::nal::sei::user_data_registered_itu_t_t35::ItuTT35;
use h264_reader::nal::sei::HeaderType;
use h264_reader::nal::slice::SliceHeader;
use h264_reader::nal::sps::SeqParameterSet;
use h264_reader::nal::{sei, Nal, RefNal, UnitType};
use h264_reader::push::NalInterest;
use h264_reader::Context;
use hex_slice::AsHex;
use std::io::Read;
fn main() {
let path = {
let mut args = std::env::args_os();
if args.len() != 2 {
eprintln!("Usage: dump-param-sets path/to/data.h264");
std::process::exit(1);
}
args.nth(1).unwrap()
};
let mut file = std::fs::File::open(path).expect("open");
// Create a context to keep track of SPS and PPS NALs that we receive. It *needs* to be
// persistent through all parsing
let mut ctx = Context::new();
// Then we prepare an AnnexBReader to handle the parsed data
let mut reader = AnnexBReader::accumulate(|nal: RefNal<'_>| {
// We only ever want to parse complete NALs.
// You can filter for the specific types of NALs you're
// interested in and NalInterest::Ignore the rest here.
//
// If a NAL is incomplete, trying to read its data will result in a WouldBlock.
if !nal.is_complete() {
return NalInterest::Buffer;
}
// Parse the NAL header, so we know what the NAL type is
let nal_header = nal.header().unwrap();
let nal_unit_type = nal_header.nal_unit_type();
// Decode the NAL types that we're interested in
match nal_unit_type {
UnitType::SeqParameterSet => {
hex_dump(&nal);
let data = SeqParameterSet::from_bits(nal.rbsp_bits()).unwrap();
println!("{:#?}", data);
// Don't forget to tell stream_context that we have a new SPS.
// If you want to handle it separately, you can clone the struct before passing along,
// But if you only care about it when a slice calls for it, you don't have to handle it here.
ctx.put_seq_param_set(data);
}
UnitType::PicParameterSet => {
hex_dump(&nal);
// Same as when parsing an SPS, except it borrows the stream context so it can pick out
// the SPS that this PPS references
let data = PicParameterSet::from_bits(&ctx, nal.rbsp_bits()).unwrap();
println!("{:#?}", data);
// Same as with an SPS, tell the context that we've found a PPS
ctx.put_pic_param_set(data);
}
UnitType::SliceLayerWithoutPartitioningIdr
| UnitType::SliceLayerWithoutPartitioningNonIdr => {
let mut bits = nal.rbsp_bits();
// We can parse the slice header, and it will give us:
let (
header, // The header of the slice
_seq_params, // A borrow of the SPS...
_pic_params, // ...and PPS activated by the header
) = SliceHeader::from_bits(
&ctx,
&mut bits, // takes a mutable borrow so the body parser can continue from where this ended
nal_header,
)
.unwrap();
println!("{:#?}", header);
}
UnitType::SEI => {
let mut scratch = vec![];
let mut reader = sei::SeiReader::from_rbsp_bytes(nal.rbsp_bytes(), &mut scratch);
loop {
match reader.next() {
Ok(Some(sei)) => {
match sei.payload_type {
HeaderType::BufferingPeriod => {
let bp = BufferingPeriod::read(&ctx, &sei);
println!("{:#?}", bp);
}
HeaderType::PicTiming => {
let pt =
PicTiming::read(ctx.sps().next().expect("first sps"), &sei);
println!("{:#?}", pt);
}
HeaderType::UserDataRegisteredItuTT35 => {
match ItuTT35::read(&sei) {
Ok(ud) => {
match ud.0 {
ItuTT35::UnitedStates => {
// TODO: check for ATSC provider code, look
// at caption data etc
println!("{:#?}", ud);
}
_ => {
println!("{:#?}", ud);
}
}
}
Err(e) => {
println!("{:?}", e);
}
}
}
_ => {
println!("{:#?}", sei);
}
}
}
Ok(None) => break,
Err(e) => {
println!("{:?}", e);
}
}
}
}
_ => {
println!("Unhandled: {:?}", nal_unit_type);
}
}
NalInterest::Ignore
});
// Push data. Doesn't have to be aligned in any way. You can push multiple times for a single
// NAL, or send an entire file in at once.
let mut buf = vec![0; 2 * 1024 * 1024];
loop {
match file.read(&mut buf[..]).expect("read") {
0 => break,
n => reader.push(&buf[0..n]),
}
}
// If we're sure that the entire current NAL has been pushed, then we can call this to signal
// that the parser should immediately stop waiting for a new NAL marker.
reader.reset();
}
fn hex_dump(nal: &RefNal) {
let mut nal_rbsp_bytes = vec![];
nal.rbsp_bytes()
.read_to_end(&mut nal_rbsp_bytes)
.expect("read NAL");
println!(
"{:?}: {:02x}",
nal.header().unwrap().nal_unit_type(),
&nal_rbsp_bytes[..].plain_hex(false)
);
}