Fix fuzzer build and add more coverage for AVIF.

Author: kinetiknz

mp4parse_capi/fuzz/fuzz_targets/avif.rs

@@ -4,6 +4,7 @@ use libfuzzer_sys::fuzz_target;
 use mp4parse_capi::*;
 use std::convert::TryInto;
 use std::io::Read;
+use std::mem::MaybeUninit;
 
 type CursorType<'a> = std::io::Cursor<&'a [u8]>;
 
@@ -29,6 +30,12 @@ fuzz_target!(|data: &[u8]| {
             return;
         }
 
+        let _info = {
+            let mut info = MaybeUninit::zeroed();
+            let _ = mp4parse_avif_get_info(&*context, info.as_mut_ptr());
+            info.assume_init()
+        };
+
         let _ = mp4parse_avif_get_image_safe(&*context);
 
         mp4parse_avif_free(context);

mp4parse_capi/fuzz/fuzz_targets/mp4.rs

@@ -55,6 +55,8 @@ fuzz_target!(|data: &[u8]| {
                 }
                 // No C API for metadata tracks yet.
                 Mp4parseTrackType::Metadata => {}
+                // Skip image data - handled by AVIF fuzzer.
+                Mp4parseTrackType::Picture | Mp4parseTrackType::AuxiliaryVideo => {}
             }
 
             let mut indices = Default::default();