src/Tools/jaby_engine_fconv/Cargo.toml

@@ -8,6 +8,7 @@ panic = "abort"
 
 [dependencies]
 clap        = {version = "4.4.11", features = ["derive"]}
+hound       = "3.5.1"
 image       = "0.24.7"
 paste       = "1.0.14"
 png         = "0.17.10"

src/Tools/jaby_engine_fconv/src/audio/adpcm/mod.rs

@@ -0,0 +1,41 @@
+use clap::{Args, ValueEnum};
+use hound::Sample;
+use image::{DynamicImage, io::Reader as ImageReader};
+use std::io::{Cursor, Write};
+use tool_helper::{print_warning, Error, Input};
+
+#[derive(Args)]
+pub struct Arguments {
+}
+
+pub fn convert(input: Input, output: &mut dyn Write) -> Result<(), Error> {
+    let mut audio_io  = hound::WavReader::new(input)?;
+    let     header    = audio_io.spec();
+
+    if header.sample_format != hound::SampleFormat::Int ||header.bits_per_sample != 16 {
+        return Err(Error::from_str("Only 16bit integer samples are supported"));
+    }
+
+    if header.channels > 1 {
+        print_warning("Found more than one audio channel. First channel will be encoded.".to_owned());
+    }
+
+    let     active_channel = 1;
+    let mut sample_count   = 0;
+    for sample in audio_io.samples::<i16>() {
+        match sample {
+            Ok(sample) => {
+                sample_count += 1;
+
+                if sample_count%active_channel == 0 {
+                    output.write(&sample.to_le_bytes())?;
+                }
+            }
+
+            Err(error) => {
+                return Err(Error::from_text(format!("Failed iterating over samples: {}", error)));
+            }
+        }
+    }
+    Ok(())
+}

src/Tools/jaby_engine_fconv/src/audio/mod.rs

@@ -1 +1,2 @@
+pub mod adpcm;
 pub mod xa;

src/Tools/jaby_engine_fconv/src/main.rs

@@ -21,8 +21,12 @@ struct CommandLine {
 
 #[derive(Subcommand)]
 enum SubCommands {
+    // === Internal Commands ===
     Nothing,
     SimpleTIM(reduced_tim::Arguments),
+    ADPCM,
+
+    // === External Commands ===
     XA(xa::Arguments)
 }
 
@@ -44,6 +48,7 @@ fn run_internal_conversion(cmd: CommandLine) -> Result<(), Error> {
         match cmd.sub_command {
             SubCommands::Nothing         => nothing::copy(&mut input, dst_buffer),
             SubCommands::SimpleTIM(args) => reduced_tim::convert(args, input, dst_buffer),
+            SubCommands::ADPCM           => adpcm::convert(input, dst_buffer),
             _                            => Err(Error::not_implemented("External functions can not be called for internal conversion"))
         }
     };