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use nihav_core::muxers::*;
use nihav_registry::register::*;
struct WAVMuxer<'a> {
bw: &'a mut ByteWriter<'a>,
data_pos: u64,
}
impl<'a> WAVMuxer<'a> {
fn new(bw: &'a mut ByteWriter<'a>) -> Self {
Self {
bw,
data_pos: 0,
}
}
}
fn patch_size(bw: &mut ByteWriter, pos: u64) -> MuxerResult<()> {
let size = bw.tell() - pos;
bw.seek(SeekFrom::Current(-((size + 4) as i64)))?;
bw.write_u32le(size as u32)?;
bw.seek(SeekFrom::End(0))?;
Ok(())
}
impl<'a> MuxCore<'a> for WAVMuxer<'a> {
fn create(&mut self, strmgr: &StreamManager) -> MuxerResult<()> {
if strmgr.get_num_streams() != 1 {
return Err(MuxerError::InvalidArgument);
}
let stream = strmgr.get_stream(0).unwrap();
if stream.get_info().get_properties().get_audio_info().is_none() {
return Err(MuxerError::InvalidArgument);
}
let ainfo = stream.get_info().get_properties().get_audio_info().unwrap();
let edata_len = if let Some(ref buf) = stream.get_info().get_extradata() { buf.len() } else { 0 };
if edata_len >= (1 << 16) {
return Err(MuxerError::UnsupportedFormat);
}
let twocc = find_wav_twocc(stream.get_info().get_name());
if twocc.is_none() {
return Err(MuxerError::UnsupportedFormat);
}
let twocc = if stream.get_info().get_name() == "pcm" {
if !ainfo.format.float { 0x0001 } else { 0x0003 }
} else {
twocc.unwrap_or(0)
};
let avg_bytes_per_sec = if stream.get_info().get_name() == "pcm" {
u32::from(ainfo.channels) * ainfo.sample_rate * u32::from(ainfo.format.bits) >> 3
} else {
0
};
self.bw.write_buf(b"RIFF\0\0\0\0WAVEfmt ")?;
self.bw.write_u32le(if edata_len == 0 { 16 } else { 18 + edata_len } as u32)?;
self.bw.write_u16le(twocc)?;
self.bw.write_u16le(ainfo.channels as u16)?;
self.bw.write_u32le(ainfo.sample_rate)?;
self.bw.write_u32le(avg_bytes_per_sec)?;
self.bw.write_u16le(ainfo.block_len as u16)?;
self.bw.write_u16le(ainfo.format.bits as u16)?;
if let Some(ref buf) = stream.get_info().get_extradata() {
self.bw.write_u16le(edata_len as u16)?;
self.bw.write_buf(buf.as_slice())?;
}
self.bw.write_buf(b"data\0\0\0\0")?;
self.data_pos = self.bw.tell();
Ok(())
}
fn mux_frame(&mut self, _strmgr: &StreamManager, pkt: NAPacket) -> MuxerResult<()> {
if self.data_pos == 0 {
return Err(MuxerError::NotCreated);
}
let stream = pkt.get_stream();
if stream.get_num() != 0 {
return Err(MuxerError::UnsupportedFormat);
}
self.bw.write_buf(pkt.get_buffer().as_slice())?;
Ok(())
}
fn flush(&mut self) -> MuxerResult<()> {
Ok(())
}
fn end(&mut self) -> MuxerResult<()> {
patch_size(&mut self.bw, self.data_pos)?;
patch_size(&mut self.bw, 8)?;
// todo patch avg_bytes_per_second if calculated
// todo write fact value if calculated
Ok(())
}
}
pub struct WAVMuxerCreator {}
impl MuxerCreator for WAVMuxerCreator {
fn new_muxer<'a>(&self, bw: &'a mut ByteWriter<'a>) -> Box<dyn MuxCore<'a> + 'a> {
Box::new(WAVMuxer::new(bw))
}
fn get_name(&self) -> &'static str { "wav" }
fn get_capabilities(&self) -> MuxerCapabilities { MuxerCapabilities::SingleAudio("any") }
}
#[cfg(test)]
mod test {
use super::*;
use std::fs::File;
use nihav_core::demuxers::*;
use crate::demuxers::*;
#[test]
fn test_wav_muxer() {
let mut dmx_reg = RegisteredDemuxers::new();
generic_register_all_demuxers(&mut dmx_reg);
let mut file = File::open("assets/Indeo/laser05.avi").unwrap();
let mut fr = FileReader::new_read(&mut file);
let mut br = ByteReader::new(&mut fr);
let dmx_f = dmx_reg.find_demuxer("avi").unwrap();
let mut dmx = create_demuxer(dmx_f, &mut br).unwrap();
let mut out_sm = StreamManager::new();
let mut out_streamno = 0;
for stream in dmx.get_streams() {
if stream.get_media_type() == StreamType::Audio {
let mut stream = NAStream::clone(&stream);
out_streamno = stream.id;
stream.id = 0;
out_sm.add_stream(stream);
}
}
let ofile = File::create("assets/test_out/muxed.wav").unwrap();
let mut fw = FileWriter::new_write(ofile);
let mut bw = ByteWriter::new(&mut fw);
let mut mux = WAVMuxer::new(&mut bw);
mux.create(&out_sm).unwrap();
loop {
let pktres = dmx.get_frame();
if let Err(e) = pktres {
if e == DemuxerError::EOF { break; }
panic!("error");
}
let mut pkt = pktres.unwrap();
println!("Got {}", pkt);
let pkt_str = pkt.get_stream();
if pkt_str.id == out_streamno {
pkt.reassign(out_sm.get_stream(0).unwrap(), pkt.get_time_information());
mux.mux_frame(&out_sm, pkt).unwrap();
}
}
mux.end().unwrap();
panic!("end");
}
}
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