EWF generation

Cargo.toml

@@ -11,3 +11,6 @@ image = "^0.23"
 colour = "^0.5"
 clap = "^2.33"
 flate2 = "1.0.26"
+samplerate = "0.2.4"
+hound = "3.5.0"
+pitch_shift = "1.0.0"

src/main.rs

@@ -82,20 +82,24 @@ fn run() -> Result<(), Box<dyn Error>> {
 
         let result = DmfModule::from_file( &input_filename )?;
 
-        let eef_files = result.get_eefs()?;
-        for ( filename, data ) in eef_files {
+        for ( filename, data ) in result.get_eefs()? {
             println!( "Creating EEF instrument file {}", filename );
             let mut file = File::create( filename )?;
             file.write_all( &data )?
         }
 
-        let eif_files = result.get_eifs()?;
-        for ( filename, data ) in eif_files {
+        for ( filename, data ) in result.get_eifs()? {
             println!( "Creating EIF instrument file {}", filename );
             let mut file = File::create( filename )?;
             file.write_all( &data )?
         }
 
+        for ( filename, data ) in result.get_ewfs()? {
+            println!( "Creating EWF audio file {}", filename );
+            let mut file = File::create( filename )?;
+            file.write_all( &data )?
+        }
+
         // TODO !!
 
         Ok( () )

src/reskit/soundtrack/engines/echo.rs

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

src/reskit/soundtrack/formats/dmf.rs

@@ -1,11 +1,13 @@
 use std::{error::Error, fs::File, io::Read, convert::TryInto, collections::HashMap, cmp::{min, max}};
 use flate2::read::ZlibDecoder;
-use crate::reskit::{utility::{get_string, get_u8, skip, get_u32, get_i8, get_i32, get_u16, get_i16, Ring, print_warning}, soundtrack::{types::{SampleRate, SampleFormat, PsgEnvelope, Note, Sample, PsgSettings}, engines::echo::EchoFormat}};
+use samplerate::convert;
+use crate::reskit::{utility::{get_string, get_u8, skip, get_u32, get_i8, get_i32, get_u16, get_i16, Ring, print_warning}, soundtrack::{types::{SampleFormat, PsgEnvelope, Note, Sample, PsgSettings}, engines::echo::EchoFormat}};
 
 const DMF_MAGIC_NUMBER: &'static str = ".DelekDefleMask.";
 const DMF_SUPPORTED_VERSION: u8 = 27;
 const DMF_MD: u8 = 0x02;
 const DMF_MD_ENHANCED_CH3: u8 = 0x42;
+const ECHO_EWF_SAMPLE_RATE: u32 = 10650;
 
 #[derive(Debug)]
 pub enum FrameMode {
@@ -566,11 +568,11 @@ impl DmfModule {
             let sample_name_chars = get_u8( bytes.by_ref() )?;
             let name = get_string( bytes.by_ref(), sample_name_chars.into() )?;
             let rate = match get_u8( bytes.by_ref() )? {
-                1 => SampleRate::Hz8000,
-                2 => SampleRate::Hz11025,
-                3 => SampleRate::Hz16000,
-                4 => SampleRate::Hz22050,
-                5 => SampleRate::Hz32000,
+                1 => 8000,
+                2 => 11025,
+                3 => 16000,
+                4 => 22050,
+                5 => 32000,
                 invalid => return Err( format!( "invalid file: invalid sample rate {}", invalid ) )?
             };
 
@@ -592,7 +594,7 @@ impl DmfModule {
             println!( "{}:\t{:?}", i, sample );
 
             for _ in 0..sample_size {
-                sample.data.push( get_u16( bytes.by_ref() )? );
+                sample.data.push( get_i16( bytes.by_ref() )? );
             }
 
             samples.push( sample );
@@ -803,6 +805,65 @@ impl EchoFormat for DmfModule {
         Ok( eifs )
     }
 
+    fn get_ewfs( &self ) -> Result<HashMap<String, Vec<u8>>, Box<dyn Error>> {
+        let mut ewfs: HashMap<String, Vec<u8>> = HashMap::new();
+
+        for sample in &self.samples {
+            // Amplify data in original sample
+            let data: Vec<i16> = sample.data
+                                        .iter()
+                                        .map( | pcm_sample | {
+                                            let big_pcm_sample: i32 = min( ( *pcm_sample as i32 ) + sample.amp as i32, i16::MAX as i32 );
+
+                                            big_pcm_sample as i16
+                                        } )
+                                        .collect();
+
+            // Convert to f32 for various library operations
+            let data: Vec<f32> = data
+                .into_iter()
+                .map( | pcm_sample | {
+                    if let SampleFormat::Bits8 = sample.bitrate {
+                        ( pcm_sample as u8 ) as f32 / 255.0
+                    } else {
+                        pcm_sample as f32 / 32767.0
+                    }
+                } )
+                .collect();
+
+            // TODO: Adjust pitch using crate pitch_shift
+            if sample.pitch > 0 {
+                print_warning( "pitch shift not yet implemented for pcm samples. your drums/voice samples/etc may sound a bit funny" );
+            }
+
+            // Use libsamplerate to resample from whatever it is now to 10650Hz, the sample rate
+            // required by Echo sound engine EWF samples.
+            let data: Vec<f32> = convert( sample.rate, ECHO_EWF_SAMPLE_RATE, 1, samplerate::ConverterType::SincBestQuality, &data )?;
+
+            // Convert from f32 back to i16, then downconvert to u8
+            let mut data: Vec<u8> = data
+                .into_iter()
+                .map( | pcm_sample | {
+                    let pcm_sample = ( ( pcm_sample + 1.0 ) * 128.0 ) as u8;
+
+                    // Do not end stream prematurely (EWF format uses 0xFF to end stream)
+                    if pcm_sample == 0xFF {
+                        0xFE
+                    } else {
+                        pcm_sample
+                    }
+                } )
+                .collect();
+
+            // Terminate stream
+            data.push( 0xFF );
+
+            ewfs.insert( format!( "{}.ewf", sample.name ), data );
+        }
+
+        Ok( ewfs )
+    }
+
 }
 
 fn get_eef_volume( dmf_volume: u8 ) -> Result<u8, Box<dyn Error>> {

src/reskit/soundtrack/types.rs

@@ -15,15 +15,6 @@ pub struct PsgSettings {
     pub wavetable: PsgEnvelope< u32 >
 }
 
-#[derive(Debug)]
-pub enum SampleRate {
-    Hz8000,
-    Hz11025,
-    Hz16000,
-    Hz22050,
-    Hz32000
-}
-
 #[derive(Debug)]
 pub enum SampleFormat {
     Bits8,
@@ -33,11 +24,11 @@ pub enum SampleFormat {
 #[derive(Debug)]
 pub struct Sample {
     pub name: String,
-    pub rate: SampleRate,
+    pub rate: u32,
     pub pitch: i8,
     pub amp: u8,
     pub bitrate: SampleFormat,
-    pub data: Vec<u16>
+    pub data: Vec<i16>
 }
 
 #[derive(Debug)]