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|
use anyhow::{Result, anyhow};
use flac_bound::{FlacEncoder, WriteWrapper};
use std::fs::File;
use symphonia::core::{
audio::SampleBuffer,
codecs::{DecoderOptions, CODEC_TYPE_NULL},
errors::Error::DecodeError,
formats::{FormatOptions, Track},
io::MediaSourceStream,
meta::MetadataOptions,
probe::{Hint, ProbeResult},
};
#[derive(Debug)]
struct StreamConfig {
channels: u32,
bits_per_sample: Bps,
sample_rate: u32,
total_samples_estimate: u64,
}
#[derive(Debug)]
enum Bps {
_16,
_24,
_32
}
fn get_probe(file: &std::path::Path) -> Result<ProbeResult> {
let src = std::fs::File::open(file)?;
let mss = MediaSourceStream::new(Box::new(src), Default::default());
let mut hint = Hint::new();
hint.with_extension("flac");
let meta_opts: MetadataOptions = Default::default();
let fmt_opts: FormatOptions = Default::default();
Ok(symphonia::default::get_probe().format(&hint, mss, &fmt_opts, &meta_opts)?)
}
fn read_streaminfo(track: &Track) -> Result<StreamConfig> {
let params = &track.codec_params;
Ok(StreamConfig {
channels: params.channels.unwrap().count() as u32,
bits_per_sample: match params.bits_per_sample.unwrap() {
16 => Bps::_16,
24 => Bps::_24,
32 => Bps::_32,
_ => return Err(anyhow!("invalid Bps"))
},
sample_rate: params.sample_rate.unwrap(),
total_samples_estimate: params.n_frames.unwrap(),
})
}
pub fn encode_file(file: &std::path::Path) -> Result<()> {
let probed = get_probe(file)?;
let mut format = probed.format;
let dec_opts: DecoderOptions = Default::default();
let track = format
.tracks()
.iter()
.find(|t| t.codec_params.codec != CODEC_TYPE_NULL)
.unwrap();
let config = read_streaminfo(track)?;
let mut outf = File::create(format!("{}.{}", file.display(), "tmp"))?;
let mut outw = WriteWrapper(&mut outf);
let mut enc = FlacEncoder::new()
.unwrap()
.channels(config.channels)
.bits_per_sample(match config.bits_per_sample {
Bps::_16 => 16,
Bps::_24 => 24,
Bps::_32 => 32
})
.sample_rate(config.sample_rate)
.total_samples_estimate(config.total_samples_estimate)
.compression_level(8)
.verify(true)
.init_write(&mut outw)
.unwrap();
let mut decoder = symphonia::default::get_codecs()
.make(&track.codec_params, &dec_opts)
.unwrap();
let track_id = track.id;
let mut sample_buf = None;
loop {
let packet = format.next_packet().unwrap();
if packet.track_id() != track_id {
continue;
}
match decoder.decode(&packet) {
Ok(audio_buf) => {
if sample_buf.is_none() {
let spec = *audio_buf.spec();
let duration = audio_buf.capacity() as u64;
sample_buf = Some(SampleBuffer::<i16>::new(duration, spec));
/* match config.bits_per_sample {
Bps::_16 => sample_buf = Some(SampleBuffer::<i16>::new(duration, spec)),
Bps::_24 => sample_buf = Some(SampleBuffer::<i24>::new(duration, spec)),
Bps::_32 => sample_buf = Some(SampleBuffer::<i32>::new(duration, spec)),
} */
}
if let Some(buf) = &mut sample_buf {
buf.copy_interleaved_ref(audio_buf);
let mut samples = Vec::new();
_ = buf.samples().iter().map(|sample| samples.push(*sample as i32)).collect::<Vec<_>>();
enc.process_interleaved(samples.as_slice(), samples.iter().len() as u32 / config.channels)
.unwrap();
}
}
Err(DecodeError(_)) => (),
Err(_) => break,
}
}
match enc.finish() {
Ok(_) => Ok(()),
Err(enc) => Err(anyhow!("Encoding failed:\t{:?}", enc.state())),
}
}
|
