use a bit more modern Rust idioms

3 files changed, 9 insertions, 13 deletions

diff --git a/src/frmwriter.rs b/src/frmwriter.rs
index a9c0612..57141cd 100644
--- a/src/frmwriter.rs
+++ b/src/frmwriter.rs
@@ -24,8 +24,7 @@ pub fn write_pgmyuv(pfx: &str, strno: usize, num: u64, frm: NAFrameRef) {
     let ls = buf.get_stride(0);
     let mut idx = 0;
     let mut idx2 = w;
-    let mut pad: Vec<u8> = Vec::with_capacity((w - w2 * 2) / 2);
-    pad.resize((w - w2 * 2) / 2, 0xFF);
+    let pad: Vec<u8> = vec![0xFF; (w - w2 * 2) / 2];
     for _ in 0..h {
         let line = &dta[idx..idx2];
         ofile.write_all(line).unwrap();
@@ -79,8 +78,7 @@ pub fn write_palppm(pfx: &str, strno: usize, num: u64, frm: NAFrameRef) {
             buf.get_info().get_format().get_chromaton(2).unwrap().get_offset() as usize
         ];
     let mut idx  = 0;
-    let mut line: Vec<u8> = Vec::with_capacity(w * 3);
-    line.resize(w * 3, 0);
+    let mut line: Vec<u8> = vec![0; w * 3];
     for _ in 0..h {
         let src = &dta[idx..(idx+w)];
         for x in 0..w {
@@ -109,8 +107,7 @@ pub fn write_ppm(pfx: &str, strno: usize, num: u64, frm: NAFrameRef) {
                 buf.get_info().get_format().get_chromaton(2).unwrap().get_offset() as usize
             ];
         let step = buf.get_info().get_format().get_elem_size() as usize;
-        let mut line: Vec<u8> = Vec::with_capacity(w * 3);
-        line.resize(w * 3, 0);
+        let mut line: Vec<u8> = vec![0; w * 3];
         for src in dta.chunks(stride) {
             for x in 0..w {
                 line[x * 3 + 0] = src[x * step + offs[0]];
@@ -140,8 +137,7 @@ pub fn write_ppm(pfx: &str, strno: usize, num: u64, frm: NAFrameRef) {
                 buf.get_info().get_format().get_chromaton(1).unwrap().get_shift(),
                 buf.get_info().get_format().get_chromaton(2).unwrap().get_shift()
             ];
-        let mut line: Vec<u8> = Vec::with_capacity(w * 3);
-        line.resize(w * 3, 0);
+        let mut line: Vec<u8> = vec![0; w * 3];
         for src in dta.chunks(stride) {
             for x in 0..w {
                 let elem = src[x];
diff --git a/src/main.rs b/src/main.rs
index 9f9d497..c26e671 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -61,7 +61,7 @@ struct AudioOutput {
 }
 
 impl AudioOutput {
-    fn new(name: &String) -> Self { Self { wwr: WavWriter::new(name), wrote_header: false } }
+    fn new(name: &str) -> Self { Self { wwr: WavWriter::new(name), wrote_header: false } }
     fn output_frame(&mut self, _pkt: &NAPacket, frm: NAFrameRef) {
         if !self.wrote_header {
             self.wwr.write_header(frm.get_info().as_ref().get_properties().get_audio_info().unwrap()).unwrap();
@@ -91,7 +91,7 @@ fn main() {
     let mut decode_audio = true;
     let mut nmode = NumberMode::FrmPTS;
 
-    while (cur_arg < args.len()) && (args[cur_arg].chars().next().unwrap() == '-') {
+    while (cur_arg < args.len()) && args[cur_arg].starts_with('-') {
         match args[cur_arg].as_str() {
             "--"        => { break; },
             "-noout"    => { noout = true; },
@@ -132,7 +132,7 @@ println!("trying demuxer {} on {}", dmx_name, name);
     br.seek(SeekFrom::Start(0)).unwrap();
     let mut dmx = create_demuxer(dmx_fact, &mut br).unwrap();
 
-    let mut decs: Vec<Option<(Box<NADecoderSupport>, Box<NADecoder>)>> = Vec::new();
+    let mut decs: Vec<Option<(Box<NADecoderSupport>, Box<dyn NADecoder>)>> = Vec::new();
     let mut sids: Vec<u32> = Vec::new();
     let mut writers: Vec<Outputter> = Vec::new();
     for i in 0..dmx.get_num_streams() {
@@ -154,7 +154,7 @@ println!("stream {} - {} {}", i, s, info.get_name());
                 dec.init(&mut dsupp, info).unwrap();
                 decs.push(Some((dsupp, dec)));
                 if !noout {
-                    writers.push(Outputter::Video(FrameOutput{prefix: "", streamno: i, frameno: 1, nmode: nmode}));
+                    writers.push(Outputter::Video(FrameOutput{prefix: "", streamno: i, frameno: 1, nmode}));
                     has_out = true;
                 }
             } else {
diff --git a/src/wavwriter.rs b/src/wavwriter.rs
index 51700f7..d72b82a 100644
--- a/src/wavwriter.rs
+++ b/src/wavwriter.rs
@@ -49,7 +49,7 @@ macro_rules! write_data {
 }
 
 impl<'a> WavWriter<'a> {
-    pub fn new(name: &String) -> Self {
+    pub fn new(name: &str) -> Self {
         let file = File::create(name).unwrap();
         let fw   = Box::new(FileWriter::new_write(file));
         let io   = ByteWriter::new(Box::leak(fw));