From 07526dcccf40b3ed8a39d69d6cd6d3bffe8e6035 Mon Sep 17 00:00:00 2001
From: aime-rolandi <rolandimoltedoaime@gmail.com>
Date: Tue, 17 Jun 2025 12:01:21 -0300
Subject: [PATCH] se inician chanels para recibir y enviar chunks desde el
 front

---
 .../channels/control_chanel.ex                |  17 +++
 .../stt_recorder_web/channels/data_chanel.ex  |  26 ++++
 .../stt_recorder_web/channels/user_socket.ex  |  14 +++
 stt_recorder/lib/stt_recorder_web/endpoint.ex |   3 +
 .../live/stt/test_with_channel.ex             | 115 ++++++++++++++++++
 stt_recorder/lib/stt_recorder_web/router.ex   |   2 +-
 6 files changed, 176 insertions(+), 1 deletion(-)
 create mode 100644 stt_recorder/lib/stt_recorder_web/channels/control_chanel.ex
 create mode 100644 stt_recorder/lib/stt_recorder_web/channels/data_chanel.ex
 create mode 100644 stt_recorder/lib/stt_recorder_web/channels/user_socket.ex
 create mode 100644 stt_recorder/lib/stt_recorder_web/live/stt/test_with_channel.ex

diff --git a/stt_recorder/lib/stt_recorder_web/channels/control_chanel.ex b/stt_recorder/lib/stt_recorder_web/channels/control_chanel.ex
new file mode 100644
index 00000000..2eb04f08
--- /dev/null
+++ b/stt_recorder/lib/stt_recorder_web/channels/control_chanel.ex
@@ -0,0 +1,17 @@
+defmodule SttRecorderWeb.Channels.ControlChanel do
+  use Phoenix.Channel
+
+  def join("control:lobby", _payload, socket) do
+    {:ok, socket}
+  end
+
+  def handle_in("set_parameter", %{"parameter" => param, "value" => value}, socket) do
+    GenServer.cast(SttServer.Transcriber, {:set_param, param, value})
+    {:reply, {:ok, %{message: "Parameter updated"}}, socket}
+  end
+
+  def handle_in("call_method", %{"method" => method}, socket) do
+    GenServer.cast(SttServer.Transcriber, {:call_method, method})
+    {:reply, {:ok, %{message: "Method called"}}, socket}
+  end
+end
diff --git a/stt_recorder/lib/stt_recorder_web/channels/data_chanel.ex b/stt_recorder/lib/stt_recorder_web/channels/data_chanel.ex
new file mode 100644
index 00000000..6d5344f0
--- /dev/null
+++ b/stt_recorder/lib/stt_recorder_web/channels/data_chanel.ex
@@ -0,0 +1,26 @@
+defmodule SttServerWeb.DataChannel do
+  use Phoenix.Channel
+
+  def join("data:lobby", _payload, socket) do
+    IO.puts("🟢 Cliente conectado al canal de datos")
+    {:ok, socket}
+  end
+
+  # Recibe audio codificado en base64 (para transporte seguro)
+  def handle_in("audio_chunk", %{"data" => base64_chunk, "sample_rate" => sample_rate}, socket) do
+    case Base.decode64(base64_chunk) do
+      {:ok, binary_audio} ->
+        # Enviamos al transcriptor
+        GenServer.cast(SttServer.Transcriber, {:audio_chunk, binary_audio, sample_rate})
+        {:noreply, socket}
+
+      :error ->
+        IO.puts("⚠️ Error al decodificar base64")
+        {:reply, {:error, %{reason: "Invalid base64 audio"}}, socket}
+    end
+  end
+
+  def handle_in(_unknown, _payload, socket) do
+    {:noreply, socket}
+  end
+end
diff --git a/stt_recorder/lib/stt_recorder_web/channels/user_socket.ex b/stt_recorder/lib/stt_recorder_web/channels/user_socket.ex
new file mode 100644
index 00000000..4d580ac9
--- /dev/null
+++ b/stt_recorder/lib/stt_recorder_web/channels/user_socket.ex
@@ -0,0 +1,14 @@
+defmodule  SttRecorderWeb.Channels.UserSocket do
+  use Phoenix.Socket
+
+  ## Channels
+  channel "control:*", SttRecorderWeb.Channels.ControlChanel
+  channel "data:*", SttServerWeb.DataChannel
+
+
+  @impl true
+  def connect(_params, socket, _connect_info), do: {:ok, socket}
+
+  @impl true
+  def id(_socket), do: nil
+end
diff --git a/stt_recorder/lib/stt_recorder_web/endpoint.ex b/stt_recorder/lib/stt_recorder_web/endpoint.ex
index 9a289bef..1e858a13 100644
--- a/stt_recorder/lib/stt_recorder_web/endpoint.ex
+++ b/stt_recorder/lib/stt_recorder_web/endpoint.ex
@@ -15,6 +15,9 @@ defmodule SttRecorderWeb.Endpoint do
     websocket: [connect_info: [session: @session_options]],
     longpoll: [connect_info: [session: @session_options]]
 
+  socket "/socket", SttRecorderWeb.Channels.UserSocket,
+    websocket: true,
+    longpoll: false
   # Serve at "/" the static files from "priv/static" directory.
   #
   # You should set gzip to true if you are running phx.digest
diff --git a/stt_recorder/lib/stt_recorder_web/live/stt/test_with_channel.ex b/stt_recorder/lib/stt_recorder_web/live/stt/test_with_channel.ex
new file mode 100644
index 00000000..37e97d87
--- /dev/null
+++ b/stt_recorder/lib/stt_recorder_web/live/stt/test_with_channel.ex
@@ -0,0 +1,115 @@
+defmodule SttRecorderWeb.Stt.TestWithChannel do
+   use SttRecorderWeb, :live_view
+
+  def mount(_params, _session, socket) do
+    {:ok, socket}
+  end
+
+  def render(assigns) do
+    ~H"""
+    <div id="container">
+      <div id="status">Presioná "Start Recording"…</div>
+      <button id="startButton">Start Recording</button>
+      <button id="stopButton" disabled>Stop Recording</button>
+
+      <div id="transcriptionContainer">
+        <div id="transcription" class="realtime"></div>
+      </div>
+
+      <div id="fullTextContainer">
+        <div id="fullText"></div>
+      </div>
+
+      <script type="module">
+        import { Socket } from "https://cdn.skypack.dev/phoenix";
+
+        const statusDiv = document.getElementById("status");
+        const transcriptionDiv = document.getElementById("transcription");
+        const fullTextDiv = document.getElementById("fullText");
+        const startButton = document.getElementById("startButton");
+        const stopButton = document.getElementById("stopButton");
+
+        let socket, channel;
+        let audioContext, mediaStream, mediaProcessor;
+
+        async function startRecording() {
+          startButton.disabled = true;
+          stopButton.disabled = false;
+          statusDiv.textContent = "Recording…";
+          transcriptionDiv.textContent = "";
+          fullTextDiv.textContent = "";
+
+          socket = new Socket("ws://localhost:4000/socket");
+          socket.connect();
+
+          channel = socket.channel("data:lobby");
+          channel.join()
+            .receive("ok", () => {
+              statusDiv.textContent = "🎙 Conectado a Phoenix STT";
+              console.log("Canal conectado");
+            })
+            .receive("error", () => {
+              statusDiv.textContent = "❌ Error al conectar";
+              console.error("Error al conectar canal");
+            });
+
+          channel.on("realtime", payload => {
+            const words = payload.text.split(" ");
+            const lastWord = words.pop();
+            transcriptionDiv.innerHTML = `${words.join(" ")} <span class="last-word">${lastWord}</span>`;
+          });
+
+          channel.on("fullSentence", payload => {
+            fullTextDiv.innerHTML += payload.text + " ";
+            transcriptionDiv.innerHTML = "";
+          });
+
+          audioContext = new AudioContext();
+          mediaStream = await navigator.mediaDevices.getUserMedia({ audio: true });
+          const input = audioContext.createMediaStreamSource(mediaStream);
+
+          mediaProcessor = audioContext.createScriptProcessor(1024, 1, 1);
+          mediaProcessor.onaudioprocess = (event) => {
+            const float32Array = event.inputBuffer.getChannelData(0);
+            const int16Array = new Int16Array(float32Array.length);
+            for (let i = 0; i < float32Array.length; i++) {
+              int16Array[i] = Math.max(-1, Math.min(1, float32Array[i])) * 0x7FFF;
+            }
+
+            const base64Audio = btoa(String.fromCharCode(...new Uint8Array(int16Array.buffer)));
+            channel.push("audio_chunk", {
+              data: base64Audio,
+              sample_rate: audioContext.sampleRate
+            });
+          };
+
+          input.connect(mediaProcessor);
+          mediaProcessor.connect(audioContext.destination);
+        }
+
+        function stopRecording() {
+          stopButton.disabled = true;
+          startButton.disabled = false;
+          statusDiv.textContent = "🛑 Grabación detenida.";
+
+          if (mediaProcessor) mediaProcessor.disconnect();
+          if (audioContext) audioContext.close();
+          if (mediaStream) mediaStream.getTracks().forEach(track => track.stop());
+          if (channel) channel.leave();
+          if (socket) socket.disconnect();
+        }
+
+        document.getElementById("startButton").onclick = startRecording;
+        document.getElementById("stopButton").onclick = stopRecording;
+      </script>
+
+      <style>
+        .last-word {
+          font-weight: bold;
+          color: orange;
+        }
+      </style>
+    </div>
+    """
+  end
+end
diff --git a/stt_recorder/lib/stt_recorder_web/router.ex b/stt_recorder/lib/stt_recorder_web/router.ex
index ff72c50e..f2d247e7 100644
--- a/stt_recorder/lib/stt_recorder_web/router.ex
+++ b/stt_recorder/lib/stt_recorder_web/router.ex
@@ -18,7 +18,7 @@ defmodule SttRecorderWeb.Router do
     pipe_through :browser
 
     get "/", PageController, :home
-    live "/sttrecorder", Stt.SttLive
+    live "/testchannel", Stt.TestWithChannel
     live "/test", Stt.TestRecorder
 
   end