fix: add a queryView

src/media.rs

@@ -6,7 +6,7 @@
 use anyhow::{self, Context};
 use gst::prelude::*;
 use gst::ClockTime;
-
+use gst_app::glib;
 use std::sync::{Arc, Mutex};
 
 use moq_transport::cache::{broadcast, fragment, segment, track};
@@ -250,19 +250,85 @@ impl GST {
         let pipeline = gst::parse::launch(
             "videotestsrc num-buffers=99 ! x264enc ! mux. \
              audiotestsrc num-buffers=140 ! avenc_aac ! mux. \
-             isomp4mux name=mux ! filesink location=test.mp4 name=sink \
+             isomp4mux name=mux ! appsink name=sink \
         ",
-        ).unwrap().downcast::<gst::Pipeline>().unwrap();
+        )
+        .unwrap()
+        .downcast::<gst::Pipeline>()
+        .unwrap();
 
         //TODO: Create a sink that is "seekable", probably with a really good EOS https://github.com/sdroege/gst-plugin-rs/blob/80b58f3b45d2c3adee5684888937a3aa30e30cd7/mux/mp4/src/mp4mux/imp.rs#L1252
 
-        // let appsink = pipeline
-        //     .by_name("sink")
-        //     .unwrap()
-        //     .dynamic_cast::<gst_app::AppSink>()
-        //     .unwrap();
+        let appsink = pipeline
+            .by_name("sink")
+            .unwrap()
+            .dynamic_cast::<gst_app::AppSink>()
+            .unwrap();
 
-        // appsink.set_buffer_list(true);
+        appsink.set_buffer_list(true);
+
+        // Set the `emit-signals` property to `true` to receive signals
+        appsink.set_property("emit-signals", &true);
+
+        // Set up a callback for the `new-sample` signal
+        // appsink.connect_new_sample(move |sink| {
+        //     // Handle the new sample
+        //     let sample = sink.pull_sample().map_err(|_| gst::FlowError::Error)?;
+        //     let buffer = sample.buffer().ok_or_else(|| gst::FlowError::Error)?;
+        //     let _map = buffer.map_readable().map_err(|_| gst::FlowError::Error)?;
+
+        //     // Perform any necessary operations on the buffer data
+
+        //     // Return Ok to indicate successful handling of the new sample
+        //     Ok(gst::FlowSuccess::Ok)
+        // });
+
+        // Set up a pad probe on the sink pad to intercept queries
+        let sink_pad = appsink.static_pad("sink").unwrap();
+        sink_pad.add_probe(gst::PadProbeType::QUERY_DOWNSTREAM, |pad, info| {
+            if let Some(ref query) = info.query_mut() {
+                //https://github.com/Kurento/gstreamer/blob/f2553fb153edeeecc2f4f74fca996c74dc8210df/plugins/elements/gstfilesink.c#L496C51-L496C69
+                use gst::QueryViewMut;
+
+                match query.view_mut() {
+                    QueryViewMut::Seeking(q) => {
+                        // We don't support any seeking at all
+                        println!("Handling query {:?}", q);
+
+                        let format = q.format();
+                        if format == gst::Format::Bytes || format == gst::Format::Default {
+                            q.set(
+                                true,
+                                gst::GenericFormattedValue::none_for_format(format),
+                                gst::GenericFormattedValue::none_for_format(format),
+                            );
+                        } else {
+                            q.set(
+                            false,
+                            gst::GenericFormattedValue::none_for_format(format),
+                            gst::GenericFormattedValue::none_for_format(format),
+                        );
+
+                        }
+                        
+                    }
+                    _ => (),
+                }
+
+                // if let gst::QueryView::Seeking(mut seeking) = query.view() {
+                //     println!("Handling query {:?}", query);
+
+                //     if seeking.format() == gst::Format::Bytes || seeking.format() == gst::Format::Default {
+                //         seeking.to_owned().set(true, 0.bytes(), 1.bytes());
+                //         return gst::PadProbeReturn::Handled;
+                //     } else {
+                //         seeking.to_owned().set(false, 0.bytes(), 1.bytes());
+                //         return gst::PadProbeReturn::Handled;
+                //     }
+                // }
+            }
+            gst::PadProbeReturn::Pass
+        });
 
         // appsink.set_callbacks(
         //     gst_app::AppSinkCallbacks::builder()
@@ -277,6 +343,27 @@ impl GST {
         //             // The muxer only outputs non-empty buffer lists
         //             let mut buffer_list = sample.buffer_list_owned().expect("no buffer list");
 
+        //             Ok(gst::FlowSuccess::Ok)
+        //         })
+        //         .query(move |sink, query| {
+        //             // Handle the seeking query
+        //             if let Some(seeking) = query.downcast_mut::<gst::query::Seeking>() {
+        //                 if seeking.format() == gst::Format::Bytes {
+        //                     // Set the seekable flag based on your custom sink's seekability
+        //                     seeking.set_seekable(true); // Replace with your own logic to determine if the sink is seekable
+        //                     return true;
+        //                 }
+        //             }
+
+        //             // Handle other queries if needed
+        //             // ...
+
+        //             // Call the default query handler for unhandled queries
+        //             sink.parent_query(query)
+        //         })
+        //         .build(),
+        // );
+
         //             println!("buffer is empty {:?}", buffer_list.is_empty());
         //             assert!(!buffer_list.is_empty());