Merge branch 'feature/adaptive-bitrate' into collaudo

Integra bitrate adattivo e telemetria, con il mute audio come icona nella toolbar della regia.

Co-authored-by: Cursor <cursoragent@cursor.com>

backend/app/services/sessions/pause.rb

@@ -9,11 +9,12 @@ module Sessions
       @session.pause! if @session.may_pause?
       Mediamtx::PublisherSync.forget_recording_state!(@session.id)
       begin
-        Mediamtx::Client.for_session(@session).set_path_recording(@session, enabled: false)
+        mtx = Mediamtx::Client.for_session(@session)
+        mtx.set_path_recording(@session, enabled: false)
+        mtx.set_always_available(@session, enabled: true)
       rescue Mediamtx::Client::Error => e
-        Rails.logger.warn("[Sessions::Pause] disable recording: #{e.message}")
+        Rails.logger.warn("[Sessions::Pause] MediaMTX: #{e.message}")
       end
-      Mediamtx::Client.for_session(@session).set_always_available(@session, enabled: true)
       # Slate su path per HLS in pausa; RTMP telefono si ferma via comando app.
       log_event("paused")
       SessionChannel.broadcast_message(@session, { type: "command", action: "pause_stream" })

backend/app/services/sessions/select_quality.rb

@@ -3,6 +3,8 @@ module Sessions
   class SelectQuality
     UPLOAD_HEADROOM = 0.8
     UPLOAD_HEADROOM_1080P = 1.0
+    AUTO_ID = "auto"
+    AUTO_FLOOR_BITRATE = 800_000
 
     PRESETS = [
       { id: "1080p_30_4.5mbps", target_bitrate: 4_500_000, target_fps: 30 },
@@ -11,6 +13,32 @@ module Sessions
       { id: "720p_30_1.5mbps", target_bitrate: 1_500_000, target_fps: 30 }
     ].freeze
 
+    MIN_QUALITY_IDS = ([AUTO_ID] + PRESETS.map { |preset| preset[:id] }).freeze
+
+    def self.floor_bitrate(preset_id)
+      return AUTO_FLOOR_BITRATE if preset_id.blank? || preset_id == AUTO_ID
+
+      PRESETS.find { |preset| preset[:id] == preset_id }&.fetch(:target_bitrate) || AUTO_FLOOR_BITRATE
+    end
+
+    def self.allowed_min_ids(session_preset)
+      ids = [AUTO_ID] + PRESETS.reject { |preset| preset[:id].start_with?("1080p") }.reverse.map { |preset| preset[:id] }
+      ids << "1080p_30_4.5mbps" if session_preset.to_s.start_with?("1080p")
+      ids
+    end
+
+    def self.display_name(preset_id)
+      return AUTO_ID if preset_id.blank? || preset_id == AUTO_ID
+
+      preset = PRESETS.find { |item| item[:id] == preset_id }
+      return preset_id unless preset
+
+      resolution = preset[:id].start_with?("1080p") ? "1080p" : "720p"
+      mbps = preset[:target_bitrate] / 1_000_000.0
+      mbps_text = (mbps == mbps.to_i) ? mbps.to_i.to_s : format("%.1f", mbps)
+      "#{resolution} · #{mbps_text} Mbps"
+    end
+
     def self.call(upload_mbps:)
       new(upload_mbps: upload_mbps).call
     end

backend/app/services/sessions/set_min_quality.rb

@@ -0,0 +1,39 @@
+# frozen_string_literal: true
+
+module Sessions
+  class SetMinQuality
+    def initialize(session, preset:)
+      @session = session
+      @preset = preset.to_s.strip
+    end
+
+    def call
+      id = normalize
+      unless SelectQuality.allowed_min_ids(@session.quality_preset).include?(id)
+        raise ArgumentError, "Qualità minima non valida"
+      end
+
+      return @session if @session.min_quality_preset == id
+
+      @session.update!(min_quality_preset: id)
+      @session.stream_events.create!(
+        event_type: "quality_changed",
+        occurred_at: Time.current,
+        metadata: { "min_quality_preset" => id }
+      )
+      SessionChannel.broadcast_message(
+        @session,
+        { type: "command", action: "set_min_quality", min_quality_preset: id }
+      )
+      @session
+    end
+
+    private
+
+    def normalize
+      return SelectQuality::AUTO_ID if @preset.blank? || @preset == SelectQuality::AUTO_ID
+
+      @preset
+    end
+  end
+end