bump minimum Rust version to 1.56

The last commit needs at least 1.53 for its use of array's IntoIterator
impl. We might as well bump up to 1.56 and take advantage of the 2021
edition.

.github/workflows/ci.yml

@@ -12,7 +12,7 @@ jobs:
       matrix:
         rust:
           - stable
-          - 1.52
+          - 1.56
         include:
           - rust: stable
             extra_components: rustfmt

CHANGELOG.md

@@ -17,6 +17,7 @@
 *   BREAKING: `retina::client::rtp::Packet` is now
     `retina::rtp::ReceivedPacket`, and field access has been removed in favor
     of accessors.
+*   minimum Rust version is now 1.56.
 
 ## `v0.3.9` (2022-04-12)
 

Cargo.toml

@@ -3,12 +3,13 @@ name = "retina"
 version = "0.4.0-alpha.0"
 authors = ["Scott Lamb <slamb@slamb.org>"]
 license = "MIT/Apache-2.0"
-edition = "2018"
+edition = "2021"
 keywords = ["rtsp", "multimedia", "video", "streaming", "ip-camera"]
 categories = ["network-programming", "multimedia"]
 description = "high-level RTSP multimedia streaming library"
 repository = "https://github.com/scottlamb/retina"
 include = ["src/**/*", "benches", "Cargo.toml"]
+rust-version = "1.56"
 
 [dependencies]
 base64 = "0.13.0"

src/codec/h264.rs

@@ -881,7 +881,8 @@ impl Packetizer {
                     data.advance(1);
                     let fu_indicator = (hdr.nal_ref_idc() << 5) | 28;
                     let fu_header = 0b1000_0000 | hdr.nal_unit_type().id(); // START bit set.
-                    let payload = IntoIterator::into_iter([fu_indicator, fu_header])
+                    let payload = [fu_indicator, fu_header]
+                        .into_iter()
                         .chain(data[..max_payload_size - 2].iter().copied());
                     // TODO: ctx and channel_id are placeholders.
                     let pkt = ReceivedPacketBuilder {

src/rtp.rs

@@ -199,10 +199,11 @@ impl RawPacketBuilder {
         if self.payload_type >= 0x80 {
             return Err("payload type too large");
         }
-        let data: Bytes = IntoIterator::into_iter([
+        let data: Bytes = [
             2 << 6, // version=2, no padding, no extensions, no CSRCs.
             if self.mark { 0b1000_0000 } else { 0 } | self.payload_type,
-        ])
+        ]
+        .into_iter()
         .chain(self.sequence_number.to_be_bytes())
         .chain(self.timestamp.to_be_bytes())
         .chain(self.ssrc.to_be_bytes())