Implement Cast Streaming mirroring, DLNA casting, daemon+GUI, and breadd integration

Builds out the full v1 scope: a vendored+patched openscreen subset for
low-latency Cast Streaming (Mirroring receiver 0F5096E8) alongside the
existing Cast V2/HLS and new DLNA/AVTransport casting paths, breadcastd's
Idle/Casting state machine with a private IPC socket, the breadcast GTK4
popup as a thin IPC client, and bread.cast.*/bread.command.cast.* breadd
integration (device discovery, start/stop, mirroring lifecycle events).
Also adds bakery/systemd/Forgejo CI packaging.

Validated end-to-end against a real Chromecast/Google TV: negotiated
Cast Streaming session, live pipeline playback, and daemon+GUI click-to-cast/
stop through the actual popup.

breadcast-caststream-sys/vendor/openscreen/cast/streaming/impl/statistics_dispatcher.cc

@@ -0,0 +1,163 @@
+// Copyright 2025 The Chromium Authors
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "cast/streaming/impl/statistics_dispatcher.h"
+
+#include <utility>
+
+#include "cast/streaming/impl/rtcp_common.h"
+#include "cast/streaming/impl/rtp_defines.h"
+#include "cast/streaming/impl/statistics_collector.h"
+#include "cast/streaming/impl/statistics_common.h"
+#include "cast/streaming/public/encoded_frame.h"
+#include "cast/streaming/public/environment.h"
+#include "cast/streaming/public/session_config.h"
+#include "platform/base/trivial_clock_traits.h"
+#include "util/chrono_helpers.h"
+#include "util/osp_logging.h"
+#include "util/std_util.h"
+#include "util/trace_logging.h"
+
+namespace openscreen::cast {
+
+using clock_operators::operator<<;
+
+StatisticsDispatcher::StatisticsDispatcher(Environment& environment)
+    : environment_(environment) {}
+StatisticsDispatcher::~StatisticsDispatcher() = default;
+
+void StatisticsDispatcher::DispatchEnqueueEvents(StreamType stream_type,
+                                                 const EncodedFrame& frame) {
+  if (!environment_->statistics_collector()) {
+    return;
+  }
+  const auto media_type = StatisticsEvent::ToMediaType(stream_type);
+
+  // Submit a capture begin event.
+  FrameEvent capture_begin_event;
+  capture_begin_event.type = StatisticsEvent::Type::kFrameCaptureBegin;
+  capture_begin_event.media_type = media_type;
+  capture_begin_event.rtp_timestamp = frame.rtp_timestamp;
+  capture_begin_event.timestamp =
+      (frame.capture_begin_time > Clock::time_point::min())
+          ? frame.capture_begin_time
+          : environment_->now();
+  environment_->statistics_collector()->CollectFrameEvent(
+      std::move(capture_begin_event));
+
+  // Submit a capture end event.
+  FrameEvent capture_end_event;
+  capture_end_event.type = StatisticsEvent::Type::kFrameCaptureEnd;
+  capture_end_event.media_type = media_type;
+  capture_end_event.rtp_timestamp = frame.rtp_timestamp;
+  capture_end_event.timestamp =
+      (frame.capture_end_time > Clock::time_point::min())
+          ? frame.capture_end_time
+          : environment_->now();
+  environment_->statistics_collector()->CollectFrameEvent(
+      std::move(capture_end_event));
+
+  // Submit an encoded event.
+  FrameEvent encode_event;
+  encode_event.timestamp = environment_->now();
+  encode_event.type = StatisticsEvent::Type::kFrameEncoded;
+  encode_event.media_type = media_type;
+  encode_event.rtp_timestamp = frame.rtp_timestamp;
+  encode_event.frame_id = frame.frame_id;
+  encode_event.size = static_cast<uint32_t>(frame.data.size());
+  encode_event.key_frame =
+      frame.dependency == openscreen::cast::EncodedFrame::Dependency::kKeyFrame;
+
+  environment_->statistics_collector()->CollectFrameEvent(
+      std::move(encode_event));
+}
+
+void StatisticsDispatcher::DispatchAckEvent(StreamType stream_type,
+                                            RtpTimeTicks rtp_timestamp,
+                                            FrameId frame_id) {
+  if (!environment_->statistics_collector()) {
+    return;
+  }
+
+  FrameEvent ack_event;
+  ack_event.timestamp = environment_->now();
+  ack_event.type = StatisticsEvent::Type::kFrameAckReceived;
+  ack_event.media_type = StatisticsEvent::ToMediaType(stream_type);
+  ack_event.rtp_timestamp = rtp_timestamp;
+  ack_event.frame_id = frame_id;
+
+  environment_->statistics_collector()->CollectFrameEvent(std::move(ack_event));
+}
+
+void StatisticsDispatcher::DispatchFrameDropEvent(StreamType stream_type,
+                                                  FrameId frame_id,
+                                                  RtpTimeTicks rtp_timestamp,
+                                                  Clock::time_point drop_time) {
+  if (!environment_->statistics_collector()) {
+    return;
+  }
+
+  FrameEvent drop_event;
+  drop_event.timestamp = drop_time;
+  drop_event.type = StatisticsEvent::Type::kFrameDroppedByEncoder;
+  drop_event.media_type = StatisticsEvent::ToMediaType(stream_type);
+  drop_event.rtp_timestamp = rtp_timestamp;
+  drop_event.frame_id = frame_id;
+
+  environment_->statistics_collector()->CollectFrameEvent(
+      std::move(drop_event));
+}
+
+void StatisticsDispatcher::DispatchFrameLogMessages(
+    StreamType stream_type,
+    const std::vector<RtcpReceiverFrameLogMessage>& messages) {
+  if (!environment_->statistics_collector()) {
+    return;
+  }
+
+  const Clock::time_point now = environment_->now();
+  const auto media_type = StatisticsEvent::ToMediaType(stream_type);
+  for (const RtcpReceiverFrameLogMessage& log_message : messages) {
+    for (const RtcpReceiverEventLogMessage& event_message :
+         log_message.messages) {
+      switch (event_message.type) {
+        case StatisticsEvent::Type::kPacketReceived: {
+          PacketEvent event;
+          event.timestamp = event_message.timestamp;
+          event.received_timestamp = now;
+          event.type = event_message.type;
+          event.media_type = media_type;
+          event.rtp_timestamp = log_message.rtp_timestamp;
+          event.packet_id = event_message.packet_id;
+          environment_->statistics_collector()->CollectPacketEvent(
+              std::move(event));
+        } break;
+
+        case StatisticsEvent::Type::kFrameAckSent:
+        case StatisticsEvent::Type::kFrameDecoded:
+        case StatisticsEvent::Type::kFramePlayedOut: {
+          FrameEvent event;
+          event.timestamp = event_message.timestamp;
+          event.received_timestamp = now;
+          event.type = event_message.type;
+          event.media_type = media_type;
+          event.rtp_timestamp = log_message.rtp_timestamp;
+          if (event.type == StatisticsEvent::Type::kFramePlayedOut) {
+            event.delay_delta = event_message.delay;
+          }
+          environment_->statistics_collector()->CollectFrameEvent(
+              std::move(event));
+        } break;
+
+        default:
+          OSP_VLOG << "Received log message via RTCP that we did not expect, "
+                      "StatisticsEvent::Type="
+                   << static_cast<int>(event_message.type);
+          break;
+      }
+    }
+  }
+}
+
+}  // namespace openscreen::cast