From 5a39e523da7f4fe2c9c1e6c369a366162be122fa Mon Sep 17 00:00:00 2001
From: jakka <jakkadoujin@gmail.com>
Date: Wed, 4 Jun 2025 17:07:16 +0300
Subject: started rewriting

---
 src/flac.rs | 130 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 130 insertions(+)
 create mode 100644 src/flac.rs

(limited to 'src/flac.rs')

diff --git a/src/flac.rs b/src/flac.rs
new file mode 100644
index 0000000..8b03664
--- /dev/null
+++ b/src/flac.rs
@@ -0,0 +1,130 @@
+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())),
+    }
+}
-- 
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