media-converter: Create a tag file when placeholder media are used.

CW-Bug-Id: #21473

media-converter/src/audioconv/imp.rs

@@ -31,6 +31,8 @@
 use crate::format_hash;
 use crate::HASH_SEED;
 use crate::discarding_disabled;
+use crate::steam_compat_shader_path;
+use crate::touch_file;
 
 use gst::glib;
 use gst::prelude::*;
@@ -633,6 +635,14 @@ impl AudioConvState {
 
         let buf = Box::new(*include_bytes!("../../blank.ptna"));
 
+        match steam_compat_shader_path() {
+            None => gst::log!(CAT, "env STEAM_COMPAT_SHADER_PATH not set"),
+            Some(mut path) => {
+                path.push("placeholder-audio-used");
+                if let Err(e) = touch_file(path) { gst::log!(CAT, "Failed to touch placeholder-audio-used file: {:?}", e) }
+            },
+        };
+
         Ok(buf)
     }
 }

media-converter/src/lib.rs

@@ -35,8 +35,14 @@ extern crate gstreamer_video as gst_video;
 extern crate gstreamer_audio as gst_audio;
 extern crate once_cell;
 
+use std::fs::File;
 use std::io;
 use std::io::Read;
+use std::path::Path;
+use std::path::PathBuf;
+
+use filetime::FileTime;
+use filetime::set_file_handle_times;
 
 #[cfg(target_arch = "x86")]
 mod murmur3_x86_128;
@@ -76,6 +82,24 @@ where
     a
 }
 
+fn touch_file<P>(p: P) -> io::Result<()>
+where
+    P: AsRef<Path> + std::fmt::Debug
+{
+    let f = File::create(p)?;
+    let now = FileTime::now();
+    set_file_handle_times(&f, Some(now), Some(now))?;
+    Ok(())
+}
+
+fn steam_compat_shader_path() -> Option<PathBuf>
+{
+    match std::env::var("STEAM_COMPAT_SHADER_PATH") {
+        Err(_) => None,
+        Ok(c) => Some(Path::new(&c).to_path_buf()),
+    }
+}
+
 /* rust has a hard time with large heap allocations. below macro works around that.
  *
  * by @simias from https://github.com/rust-lang/rust/issues/53827 */

media-converter/src/videoconv/imp.rs

@@ -34,6 +34,8 @@ use crate::box_array;
 use crate::copy_into_array;
 use crate::BufferedReader;
 use crate::discarding_disabled;
+use crate::steam_compat_shader_path;
+use crate::touch_file;
 
 use gst::glib;
 use gst::prelude::*;
@@ -346,6 +348,14 @@ impl VideoConvState {
         self.transcode_hash = None;
         self.our_duration = Some(include_bytes!("../../blank.mkv").len() as u64);
 
+        match steam_compat_shader_path() {
+            None => gst::log!(CAT, "env STEAM_COMPAT_SHADER_PATH not set"),
+            Some(mut path) => {
+                path.push("placeholder-video-used");
+                if let Err(e) = touch_file(path) { gst::log!(CAT, "Failed to touch placeholder-video-used file: {:?}", e) }
+            },
+        };
+
         false
     }