[feat] introduce fraction lost into congestion control module

src/channel/meida_channel/audio_channel_send.cpp

@@ -0,0 +1,56 @@
+#include "audio_channel_send.h"
+
+#include "log.h"
+
+AudioChannelSend::AudioChannelSend() {}
+
+AudioChannelSend::~AudioChannelSend() {}
+
+AudioChannelSend::AudioChannelSend(
+    std::shared_ptr<IceAgent> ice_agent,
+    std::shared_ptr<IOStatistics> ice_io_statistics)
+    : ice_agent_(ice_agent), ice_io_statistics_(ice_io_statistics) {}
+
+void AudioChannelSend::Initialize(rtp::PAYLOAD_TYPE payload_type) {
+  rtp_audio_sender_ = std::make_unique<RtpAudioSender>(ice_io_statistics_);
+  rtp_packetizer_ =
+      RtpPacketizer::Create(payload_type, rtp_audio_sender_->GetSsrc());
+
+  rtp_audio_sender_->SetSendDataFunc(
+      [this](const char *data, size_t size) -> int {
+        if (!ice_agent_) {
+          LOG_ERROR("ice_agent_ is nullptr");
+          return -1;
+        }
+
+        auto ice_state = ice_agent_->GetIceState();
+
+        if (ice_state != NICE_COMPONENT_STATE_CONNECTED &&
+            ice_state != NICE_COMPONENT_STATE_READY) {
+          LOG_ERROR("Ice is not connected, state = [{}]",
+                    nice_component_state_to_string(ice_state));
+          return -2;
+        }
+
+        ice_io_statistics_->UpdateAudioOutboundBytes((uint32_t)size);
+        return ice_agent_->Send(data, size);
+      });
+
+  rtp_audio_sender_->Start();
+}
+
+void AudioChannelSend::Destroy() {
+  if (rtp_audio_sender_) {
+    rtp_audio_sender_->Stop();
+  }
+}
+
+int AudioChannelSend::SendAudio(char *data, size_t size) {
+  if (rtp_audio_sender_ && rtp_packetizer_) {
+    std::vector<std::shared_ptr<RtpPacket>> rtp_packets =
+        rtp_packetizer_->Build((uint8_t *)data, (uint32_t)size, 0, true);
+    rtp_audio_sender_->Enqueue(rtp_packets);
+  }
+
+  return 0;
+}