Add transcoder. Update vk-video dependency. (#7)

* adds Membrane.VKVideo.Transcoder along with Membrane.VKVideo.Transcoder.OutputConfig specifying desired output of the transcoder
* adds transcoder.rs with transcoder-specific functions
* adds new_transcoder(), transcoder and flush_transcoder() NIFs
* updates the dependeny to vk-video, adjusts to its new API and update test fixtures
* moves EncodedFrame struct from encoder.rs to common lib.rs
* removes Cargo dependencies to wgpu and naga
* adds transcoder integration tests
* adds a helper mechanism to update reference files by setting TAKE_TEST_REFERENCES_SNAPSHOT=1 env

Author: varsill

.circleci/config.yml

@@ -2,14 +2,33 @@ version: 2.1
 orbs:
   elixir: membraneframework/elixir@1
 
+jobs:
+  rust_lint:
+    docker:
+      - image: rust:latest
+    steps:
+      - checkout
+      - run:
+          name: Install rustfmt and clippy
+          command: rustup component add rustfmt clippy
+      - run:
+          name: Check formatting
+          command: cargo fmt --check
+      - run:
+          name: Run clippy
+          command: cargo clippy -- -D warnings
+
 workflows:
   version: 2
   build:
     jobs:
-      - elixir/build_test:
+      - rust_lint:
           filters: &filters
             tags:
               only: /v.*/
+      - elixir/build_test:
+          filters:
+            <<: *filters
       - elixir/test:
           filters:
             <<: *filters

.credo.exs

@@ -125,7 +125,7 @@
         {Credo.Check.Refactor.MatchInCondition, []},
         {Credo.Check.Refactor.NegatedConditionsInUnless, []},
         {Credo.Check.Refactor.NegatedConditionsWithElse, []},
-        {Credo.Check.Refactor.Nesting, []},
+        {Credo.Check.Refactor.Nesting, [max_nesting: 3]},
         {Credo.Check.Refactor.UnlessWithElse, []},
         {Credo.Check.Refactor.WithClauses, []},