Upgrade dmf to file version 27 and fix issues

src/reskit/soundtrack/engines/echo.rs

@@ -4,4 +4,6 @@ pub trait EchoFormat {
 
     fn get_eefs( &self ) -> Result<HashMap<String, Vec<u8>>, Box<dyn Error>>;
 
+    fn get_eifs( &self ) -> Result<HashMap<String, Vec<u8>>, Box<dyn Error>>;
+
 }

src/reskit/soundtrack/formats/dmf.rs

@@ -3,7 +3,7 @@ use flate2::read::ZlibDecoder;
 use crate::reskit::{utility::{get_string, get_u8, skip, get_u32, get_i8, get_i32, get_u16, get_i16, Ring}, soundtrack::{types::{SampleRate, SampleFormat, PsgEnvelope, Note, Sample, PsgSettings}, engines::echo::EchoFormat}};
 
 const DMF_MAGIC_NUMBER: &'static str = ".DelekDefleMask.";
-const DMF_SUPPORTED_VERSION: u8 = 0x18;
+const DMF_SUPPORTED_VERSION: u8 = 27;
 const DMF_MD: u8 = 0x02;
 const DMF_MD_ENHANCED_CH3: u8 = 0x42;
 
@@ -74,7 +74,7 @@ pub struct DmfModule {
     speed_b: u8,
     frame_mode: FrameMode,
     rows_per_pattern: u32,
-    pattern_matrix: Vec<Vec<u8>>,
+    pattern_matrix: Vec<Vec<u16>>,
     instruments: Vec<Instrument>,
     samples: Vec<Sample>
 }
@@ -166,12 +166,12 @@ impl DmfModule {
             13
         };
 
-        let mut pattern_matrix: Vec<Vec<u8>> = vec![vec![0; system_total_channels]; patterns_count.into()];
+        let mut pattern_matrix: Vec<Vec<u16>> = vec![vec![0; system_total_channels]; patterns_count.into()];
         for channel in 0..system_total_channels {
             for pattern in 0..patterns_count {
                 let channel: usize = channel.into();
                 let pattern: usize = pattern.into();
-                pattern_matrix[ pattern ][ channel ] = get_u8( bytes.by_ref() )?;
+                pattern_matrix[ pattern ][ channel ] = get_u16( bytes.by_ref() )?;
             }
         }
 
@@ -471,10 +471,17 @@ impl DmfModule {
             instruments.push( Instrument { name, instrument_type } );
         }
 
-        // Wavetables are not used in fm synthesis, this should validate as 0 or error
-        let wavetable_count = get_u8( bytes.by_ref() )?;
-        if wavetable_count > 0 {
-            return Err( "invalid file: wavetables should be zero for system type Sega Megadrive" )?;
+        // Version 27 of DMF specifies "1 wavetable of 0 bytes" for sega megadrive
+        // They will never be used in the megadrive, barring use of the audio
+        // expansion on the cartridge slot (e.g. mp3 fpga, spc700 fpga)
+        // It may just be easier here to eat the wavetables as they are indicated
+        // instead of throwing a validation error if anything is present here.
+        let wavetable_len = get_u8( bytes.by_ref() )?;
+        for _ in 0..wavetable_len {
+            let wavetable_size: usize = get_u32( bytes.by_ref() )?.try_into()?;
+            if wavetable_size > 0 {
+                skip( bytes.by_ref(), wavetable_size * 4 );
+            }
         }
 
         // (channel, patterns)
@@ -584,6 +591,9 @@ impl DmfModule {
             }
 
             samples.push( sample );
+
+            // Fast forward 8 bytes that are unused at the end of the sample
+            skip( bytes.by_ref(), 8 );
         }
 
         Ok(
@@ -727,6 +737,21 @@ impl EchoFormat for DmfModule {
         Ok( eefs )
     }
 
+    fn get_eifs( &self ) -> Result<HashMap<String, Vec<u8>>, Box<dyn Error>> {
+        let mut eifs: HashMap<String, Vec<u8>> = HashMap::new();
+
+        for instrument in &self.instruments {
+            if let InstrumentType::Fm( settings ) = &instrument.instrument_type {
+                // Create feedback + algorithm byte
+                let alg_fb: u8 = ( settings.fb << 3 ) | settings.alg;
+
+                todo!()
+            }
+        }
+
+        Ok( eifs )
+    }
+
 }
 
 fn get_eef_volume( dmf_volume: u8 ) -> Result<u8, Box<dyn Error>> {