fix AvioContext write_packet callback changed in ffmpeg 7

build.rs

@@ -0,0 +1,12 @@
+use std::env;
+
+fn main() {
+    for (name, _value) in env::vars() {
+        if name.starts_with("DEP_FFMPEG_") {
+            println!(
+                r#"cargo:rustc-cfg=feature="{}""#,
+                name["DEP_FFMPEG_".len()..name.len()].to_lowercase()
+            );
+        }
+    }
+}

src/ffi.rs

@@ -141,7 +141,7 @@ pub fn output_raw_packetized_buf_start(
             // No `read_packet`.
             None,
             // Passthrough for `write_packet`.
-            Some(output_raw_buf_start_callback as _),
+            Some(output_raw_buf_start_callback),
             // No `seek`.
             None,
         );
@@ -436,11 +436,16 @@ pub fn init_logging() {
     }
 }
 
+#[cfg(feature = "ffmpeg_7_0")]
+type __AvioContextWritePacketCbParam2Type = *const u8;
+#[cfg(not(feature = "ffmpeg_7_0"))]
+type __AvioContextWritePacketCbParam2Type = *mut u8;
+
 /// Passthrough function that is passed to `libavformat` in `avio_alloc_context` and pushes buffers
 /// from a packetized stream onto the packet buffer held in `opaque`.
 extern "C" fn output_raw_buf_start_callback(
     opaque: *mut std::ffi::c_void,
-    buffer: *mut u8,
+    buffer: __AvioContextWritePacketCbParam2Type,
     buffer_size: i32,
 ) -> i32 {
     unsafe {