Make FLACMetadataBlock(s) public.

Decoders generally need access to these to configure output,
display metadata and so on. The block type should probably
be an enum instead, but this will work for now.

Author: rillian

mp4parse/src/lib.rs

@@ -257,16 +257,16 @@ pub struct VPxConfigBox {
 }
 
 #[derive(Debug, Clone)]
-struct FLACMetadataBlock {
-    block_type: u8,
-    data: Vec<u8>,
+pub struct FLACMetadataBlock {
+    pub block_type: u8,
+    pub data: Vec<u8>,
 }
 
 /// Represet a FLACSpecificBox 'dfLa'
 #[derive(Debug, Clone)]
 pub struct FLACSpecificBox {
     version: u8,
-    blocks: Vec<FLACMetadataBlock>,
+    pub blocks: Vec<FLACMetadataBlock>,
 }
 
 #[derive(Debug, Clone)]

mp4parse/tests/public.rs

@@ -75,8 +75,9 @@ fn public_api() {
                         assert_eq!(esds.audio_sample_rate.unwrap(), 48000);
                         "ES"
                     }
-                    mp4::AudioCodecSpecific::FLACSpecificBox(_) => {
-                        // No public fields.
+                    mp4::AudioCodecSpecific::FLACSpecificBox(flac) => {
+                        assert!(flac.blocks.len() > 0);
+                        assert!(flac.blocks[0].data.len() > 0);
                         "FLAC"
                     }
                     mp4::AudioCodecSpecific::OpusSpecificBox(opus) => {