Fix clippy warnings

Author: willkelleher

src/mp4box/mp4a.rs

@@ -285,7 +285,7 @@ fn size_of_length(size: u32) -> u32 {
 fn write_desc<W: Write>(writer: &mut W, tag: u8, size: u32) -> Result<u64> {
     writer.write_u8(tag)?;
 
-    if size as u64 > std::u32::MAX as u64 {
+    if size as u64 > u32::MAX as u64 {
         return Err(Error::InvalidData("invalid descriptor length range"));
     }
 

src/track.rs

@@ -281,7 +281,7 @@ impl Mp4Track {
 
     pub fn sequence_parameter_set(&self) -> Result<&[u8]> {
         if let Some(ref avc1) = self.trak.mdia.minf.stbl.stsd.avc1 {
-            match avc1.avcc.sequence_parameter_sets.get(0) {
+            match avc1.avcc.sequence_parameter_sets.first() {
                 Some(nal) => Ok(nal.bytes.as_ref()),
                 None => Err(Error::EntryInStblNotFound(
                     self.track_id(),
@@ -296,7 +296,7 @@ impl Mp4Track {
 
     pub fn picture_parameter_set(&self) -> Result<&[u8]> {
         if let Some(ref avc1) = self.trak.mdia.minf.stbl.stsd.avc1 {
-            match avc1.avcc.picture_parameter_sets.get(0) {
+            match avc1.avcc.picture_parameter_sets.first() {
                 Some(nal) => Ok(nal.bytes.as_ref()),
                 None => Err(Error::EntryInStblNotFound(
                     self.track_id(),
@@ -665,7 +665,7 @@ impl Mp4TrackWriter {
         let mut trak = TrakBox::default();
         trak.tkhd.track_id = track_id;
         trak.mdia.mdhd.timescale = config.timescale;
-        trak.mdia.mdhd.language = config.language.to_owned();
+        config.language.clone_into(&mut trak.mdia.mdhd.language);
         trak.mdia.hdlr.handler_type = config.track_type.into();
         trak.mdia.minf.stbl.co64 = Some(Co64Box::default());
         match config.media_conf {

src/writer.rs

@@ -117,7 +117,7 @@ impl<W: Write + Seek> Mp4Writer<W> {
     fn update_mdat_size(&mut self) -> Result<()> {
         let mdat_end = self.writer.stream_position()?;
         let mdat_size = mdat_end - self.mdat_pos;
-        if mdat_size > std::u32::MAX as u64 {
+        if mdat_size > u32::MAX as u64 {
             self.writer.seek(SeekFrom::Start(self.mdat_pos))?;
             self.writer.write_u32::<BigEndian>(1)?;
             self.writer.seek(SeekFrom::Start(self.mdat_pos + 8))?;