support custom filter in playlist

docs/custom_filters.md

@@ -1,6 +1,7 @@
 ## Custom filter
 
-ffplayout allows it to define a custom filter string. For that is the parameter **custom_filter** in the **ffplayout.yml** config file.
+ffplayout allows it to define a custom filter string. For that is the parameter **custom_filter** in the **ffplayout.yml** config file. The playlist can also contain a **custom_filter** paramter for every clip, with the same usage.
+
 The filter outputs should end with `[c_v_out]` for video filter, and `[c_a_out]` for audio filter. The filters will be apply on every clip and after the filters which unify the clips.
 
 It is possible to apply only video or audio filters, or both. For a better understanding here some examples:

lib/src/filter/mod.rs

@@ -382,6 +382,7 @@ pub fn filter_chains(
     realtime_filter(node, &mut filters, config, Audio);
 
     custom(&config.processing.custom_filter, &mut filters);
+    custom(&node.custom_filter, &mut filters);
 
     let mut filter_cmd = vec![];
     let mut filter_str: String = String::new();

lib/src/utils/json_serializer.rs

@@ -116,6 +116,7 @@ fn loop_playlist(
                 last_ad: Some(false),
                 next_ad: Some(false),
                 filter: Some(vec![]),
+                custom_filter: String::new(),
             };
 
             if begin < start_sec + length {

lib/src/utils/mod.rs

@@ -69,6 +69,9 @@ pub struct Media {
     #[serde(skip_serializing, skip_deserializing)]
     pub filter: Option<Vec<String>>,
 
+    #[serde(default)]
+    pub custom_filter: String,
+
     #[serde(skip_serializing, skip_deserializing)]
     pub probe: Option<MediaProbe>,
 
@@ -113,6 +116,7 @@ impl Media {
             audio: String::new(),
             cmd: Some(vec!["-i".to_string(), src]),
             filter: Some(vec![]),
+            custom_filter: String::new(),
             probe,
             last_ad: Some(false),
             next_ad: Some(false),