Add support for requesting keyframes

.circleci/config.yml

@@ -7,13 +7,16 @@ workflows:
   build:
     jobs:
       - elixir/build_test:
+          cache-version: 2
           filters: &filters
             tags:
               only: /v.*/
       - elixir/test:
+          cache-version: 2
           filters:
             <<: *filters
       - elixir/lint:
+          cache-version: 2
           filters:
             <<: *filters
       - elixir/hex_publish:

lib/membrane/live_compositor/live_compositor.ex

@@ -597,21 +597,10 @@ defmodule Membrane.LiveCompositor do
              Request.UnregisterInput,
              Request.UnregisterOutput,
              Request.UpdateVideoOutput,
-             Request.UpdateAudioOutput
+             Request.UpdateAudioOutput,
+             Request.KeyframeRequest
            ] do
-    response =
-      IntoRequest.into_request(req)
-      |> ApiClient.send_request(state.lc_port)
-
-    case response do
-      {:error, exception} ->
-        Membrane.Logger.error(
-          "LiveCompositor failed to send a request: #{inspect(req)}.\nException: #{inspect(exception)}."
-        )
-
-      {:ok, _result} ->
-        nil
-    end
+    response = handle_request(req, state.lc_port)
 
     {[notify_parent: {:request_result, req, response}], state}
   end
@@ -685,6 +674,13 @@ defmodule Membrane.LiveCompositor do
     {[notify_parent: {:output_registered, pad_ref, state.context}], state}
   end
 
+  @impl true
+  def handle_child_notification(:keyframe_request, {:output_processor, pad_id}, _ctx, state) do
+    handle_request(%Request.KeyframeRequest{output_id: pad_id}, state.lc_port)
+
+    {[], state}
+  end
+
   @impl true
   def handle_child_notification(msg, child, _ctx, state) do
     Membrane.Logger.debug(
@@ -767,4 +763,23 @@ defmodule Membrane.LiveCompositor do
   defp output_group_id(output_id) do
     "output_group_#{output_id}"
   end
+
+  @spec handle_request(Request.t(), :inet.port_number()) :: ApiClient.request_result()
+  defp handle_request(req, lc_port) do
+    response =
+      IntoRequest.into_request(req)
+      |> ApiClient.send_request(lc_port)
+
+    case response do
+      {:error, exception} ->
+        Membrane.Logger.error(
+          "LiveCompositor failed to send a request: #{inspect(req)}.\nException: #{inspect(exception)}."
+        )
+
+      {:ok, _result} ->
+        nil
+    end
+
+    response
+  end
 end

lib/membrane/live_compositor/output_processor.ex

@@ -19,7 +19,10 @@ defmodule Membrane.LiveCompositor.VideoOutputProcessor do
 
   @impl true
   def handle_init(_ctx, opt) do
-    {[], %{output_stream_format: opt.output_stream_format}}
+    {[],
+     %{
+       output_stream_format: opt.output_stream_format
+     }}
   end
 
   @impl true
@@ -31,6 +34,21 @@ defmodule Membrane.LiveCompositor.VideoOutputProcessor do
   def handle_stream_format(_pad, _stream_format, _ctx, state) do
     {[stream_format: {:output, state.output_stream_format}], state}
   end
+
+  @impl true
+  def handle_event(:input, event, _ctx, state) do
+    {[event: {:output, event}], state}
+  end
+
+  @impl true
+  def handle_event(:output, %Membrane.KeyframeRequestEvent{}, _ctx, state) do
+    {[notify_parent: :keyframe_request], state}
+  end
+
+  @impl true
+  def handle_event(:output, event, _ctx, state) do
+    {[event: {:input, event}], state}
+  end
 end
 
 defmodule Membrane.LiveCompositor.AudioOutputProcessor do

lib/membrane/live_compositor/request.ex

@@ -286,6 +286,30 @@ defmodule Membrane.LiveCompositor.Request do
     end
   end
 
+  defmodule KeyframeRequest do
+    @moduledoc """
+    Request to trigger additional keyframe generation for a specified output.
+    """
+
+    @enforce_keys [:output_id]
+    defstruct @enforce_keys
+
+    @typedoc """
+    - `:output_id` - Id of the output for which additional keyframe should be generated.
+    """
+    @type t :: %__MODULE__{
+            output_id: Membrane.LiveCompositor.output_id()
+          }
+  end
+
+  defimpl ApiClient.IntoRequest, for: KeyframeRequest do
+    @spec into_request(KeyframeRequest.t()) :: ApiClient.request()
+    def into_request(request) do
+      encoded_id = URI.encode_www_form(request.output_id)
+      {:post, "/api/output/#{encoded_id}/request_keyframe", %{}}
+    end
+  end
+
   @type t ::
           RegisterImage.t()
           | RegisterShader.t()
@@ -295,6 +319,7 @@ defmodule Membrane.LiveCompositor.Request do
           | UnregisterOutput.t()
           | UpdateVideoOutput.t()
           | UpdateAudioOutput.t()
+          | KeyframeRequest.t()
 
   @type result :: {:request_result, t(), {:ok, any()} | {:error, any()}}
 end