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use std::fs::File;
use std::io;
use std::io::{Read, Write, Seek, SeekFrom};
use std::io::{Error, ErrorKind};
use super::Bitstream;
pub struct Bin {
pub input: String,
pub output: String,
pub frame_num: usize,
pub h265: bool,
}
impl Bin {
pub fn helper() {
println!("Usage: split bin input.bin output frame_num h264|h265")
}
pub fn new(args: &[String]) -> Result<Bin, &'static str> {
let l = args.len() as usize;
if l < 6 {
return Err("too less arguments for split bin mode");
}
let input = args[2].clone();
let output = args[3].clone();
let frame_num_opt = args[4].clone().parse::<usize>();
let frame_num = match frame_num_opt {
Ok(frame_num) => frame_num,
Err(_) => {
return Err("can't parse frame_num as usize");
}
};
let h265 = match args[5].to_lowercase().as_ref() {
"h265" => true,
"h264" => false,
_ => {
return Err("only support h264 and h265");
}
};
Ok(Bin {
input: input,
output: output,
frame_num: frame_num,
h265: h265,
})
}
pub fn run(&self) -> io::Result<()> {
println!("Split H26{} {} into {}",
4 + (self.h265 as i32),
self.input,
self.output);
let mut fi = try!(File::open(self.input.clone()));
let mut bk_container: Vec<u8> = Vec::new();
let mut bs_container: Vec<Bitstream> = Vec::new();
let mut pre_frame_no = 0;
let mut cur_frame_no = 0;
let mut bak_byte_pos = 0;
loop {
let (eof, opt) = self.find_au_nal_units(&mut fi);
let mut bs = match opt {
Ok(bs) => bs,
Err(_) => {
break;
}
};
bs.buf_size = bs.frame_location[bs.nal_size] - bs.frame_location[0];
if bs.idr_flag {
print!("IDR");
} else {
print!(".");
}
if bs.idr_flag && cur_frame_no - pre_frame_no >= (self.frame_num as i32) {
if let Err(e) = self.write_to_file(&mut pre_frame_no,
cur_frame_no,
bak_byte_pos,
&mut bk_container,
&mut bs_container) {
return Err(e);
}
bs_container.clear();
bak_byte_pos = bk_container.len();
}
for i in 0..bs.nal_size {
if bs.frame_header[i]==32 ||
bs.frame_header[i]==33 ||
bs.frame_header[i]==34
{
for j in 0..bs.frame_location[i + 1] - bs.frame_location[i] {
bk_container.push(bs.frame_data[(bs.frame_location[i] + j) as usize]);
}
}
}
bs_container.push(bs);
if eof {
break;
}
cur_frame_no += 1;
}
if let Err(e) = self.write_to_file(&mut pre_frame_no,
cur_frame_no,
bak_byte_pos,
&mut bk_container,
&mut bs_container) {
return Err(e);
}
Ok(())
}
fn find_au_nal_units(&self, fp_bs: &mut File) -> (bool, io::Result<Bitstream>) {
const START_CODE_SIZE: i32 = 3;
const MAX_NAL_UNITS_PER_BS: usize = 600;
let mut bs = Bitstream {
frame_header: vec![0u8; MAX_NAL_UNITS_PER_BS+1],
frame_location: vec![0u32; MAX_NAL_UNITS_PER_BS+1],
nal_size: 0,
frame_data: vec![0u8; 0],
buf_size: 0,
idr_flag: false,
};
let mut buf = [0u8; 1];
let mut frame_data_size = 0;
let mut num_nal_units = 0;
let mut zeros = 0;
let mut pic_found_flag = false;
let mut bs_size_since_last_slice = START_CODE_SIZE;
let mut num_nal_units_since_last_slice = 0;
let mut last_slice_flag = true;
loop {
match fp_bs.read(&mut buf) {
Ok(n) => {
if n != 1 {
bs.frame_location[num_nal_units] = frame_data_size;
bs.nal_size = num_nal_units;
return (true, Ok(bs));
}
}
Err(e) => {
return (false, Err(e));
}
};
bs.frame_data.push(buf[0]);
frame_data_size += 1;
if !last_slice_flag {
bs_size_since_last_slice += 1;
}
match buf[0] {
0 => {
zeros += 1;
}
1 => {
if zeros > 1 {
bs.frame_location[num_nal_units] = frame_data_size - zeros - 1;
match fp_bs.read(&mut buf) {
Ok(n) => {
if n != 1 {
return (true, Ok(bs));
}
}
Err(e) => {
return (false, Err(e));
}
};
let nal_unit_type = (buf[0] & 0x7E) >> 1;
bs.frame_header[num_nal_units] = nal_unit_type;
if nal_unit_type <= 23 {
match fp_bs.read(&mut buf) {
Ok(n) => {
if n != 1 {
return (true, Ok(bs));
}
}
Err(e) => {
return (false, Err(e));
}
};
match fp_bs.read(&mut buf) {
Ok(n) => {
if n != 1 {
return (true, Ok(bs));
}
}
Err(e) => {
return (false, Err(e));
}
};
let first_slice_in_pic_flag = (buf[0] >> 7) != 0;
if first_slice_in_pic_flag {
if pic_found_flag {
fp_bs.seek(SeekFrom::Current(-3 -
(bs_size_since_last_slice as i64)))
.unwrap();
bs.nal_size = num_nal_units - num_nal_units_since_last_slice;
return (false, Ok(bs));
} else {
fp_bs.seek(SeekFrom::Current(-3)).unwrap();
num_nal_units += 1;
zeros = 0;
pic_found_flag = true;
bs.idr_flag = nal_unit_type==19 || nal_unit_type == 20 ;
}
} else {
fp_bs.seek(SeekFrom::Current(-3)).unwrap();
num_nal_units += 1;
zeros = 0;
}
last_slice_flag = true;
bs_size_since_last_slice = START_CODE_SIZE;
num_nal_units_since_last_slice = 0;
} else {
if nal_unit_type == 40 {
last_slice_flag = true;
bs_size_since_last_slice = START_CODE_SIZE;
num_nal_units_since_last_slice = 0;
} else {
last_slice_flag = false;
num_nal_units_since_last_slice += 1;
}
fp_bs.seek(SeekFrom::Current(-1)).unwrap();
num_nal_units += 1;
zeros = 0;
}
} else {
zeros = 0;
}
}
_ => {
zeros = 0;
}
}
}
}
fn write_to_file(&self,
pre_frame_no: &mut i32,
cur_frame_no: i32,
bak_byte_pos: usize,
bk_container: &mut [u8],
bs_container: &mut [Bitstream])
-> io::Result<()> {
let output_bin = format!("{}_{:04}_{:04}.bin",
self.output,
*pre_frame_no,
cur_frame_no - 1);
println!("\nFrames[{:04}-{:04}] => {}\n",
*pre_frame_no,
cur_frame_no - 1,
output_bin);
let mut fo = try!(File::create(output_bin));
{
let bytes_write = fo.write(&bk_container[0..bak_byte_pos]).unwrap();
if bytes_write != bak_byte_pos {
return Err(Error::new(ErrorKind::Other, "bytes write is not expected ..."));
}
}
for b in bs_container {
let bytes_write = fo.write(&b.frame_data[0..(b.buf_size as usize)]).unwrap();
if bytes_write != (b.buf_size as usize) {
return Err(Error::new(ErrorKind::Other, "bytes write is not expected ..."));
}
}
*pre_frame_no = cur_frame_no;
Ok(())
}
}