Create app.py

app.py

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+# -*- coding: utf-8 -*-
+# Copyright 2025 Google LLC
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+"""
+## Setup
+
+The gradio-webrtc install fails unless you have ffmpeg@6, on mac:
+
+```
+brew uninstall ffmpeg
+brew install ffmpeg@6
+brew link ffmpeg@6
+```
+
+Create a virtual python environment, then install the dependencies for this script:
+
+```
+pip install websockets numpy gradio-webrtc "gradio>=5.9.1"
+```
+
+If installation fails it may be
+
+Before running this script, ensure the `GOOGLE_API_KEY` environment
+
+```
+$ export GOOGLE_API_KEY ='add your key here'
+```
+
+You can get an api-key from Google AI Studio (https://aistudio.google.com/apikey)
+
+## Run
+
+To run the script:
+
+```
+python gemini_gradio_audio.py
+```
+
+On the gradio page (http://127.0.0.1:7860/) click record, and talk, gemini will reply. But note that interruptions
+don't work.
+
+"""
+
+import os
+import base64
+import json
+import numpy as np
+import gradio as gr
+import websockets.sync.client
+from gradio_webrtc import StreamHandler, WebRTC
+
+__version__ = "0.0.3"
+
+#KEY_NAME="AIzaSyCWPviRPxj8IMLaijLGbRIsio3dO2rp3rU"
+
+# Configuration and Utilities
+class GeminiConfig:
+    """Configuration settings for Gemini API."""
+    def __init__(self):
+        self.api_key = os.getenv(KEY_NAME)
+        self.host = "generativelanguage.googleapis.com"
+        self.model = "models/gemini-2.0-flash-exp"
+        self.ws_url = f"wss://{self.host}/ws/google.ai.generativelanguage.v1alpha.GenerativeService.BidiGenerateContent?key={self.api_key}"
+
+class AudioProcessor:
+    """Handles encoding and decoding of audio data."""
+    @staticmethod
+    def encode_audio(data, sample_rate):
+        """Encodes audio data to base64."""
+        encoded = base64.b64encode(data.tobytes()).decode("UTF-8")
+        return {
+            "realtimeInput": {
+                "mediaChunks": [
+                    {
+                        "mimeType": f"audio/pcm;rate={sample_rate}",
+                        "data": encoded,
+                    }
+                ],
+            },
+        }
+
+    @staticmethod
+    def process_audio_response(data):
+        """Decodes audio data from base64."""
+        audio_data = base64.b64decode(data)
+        return np.frombuffer(audio_data, dtype=np.int16)
+
+# Gemini Interaction Handler
+class GeminiHandler(StreamHandler):
+    """Handles streaming interactions with the Gemini API."""
+    def __init__(self, expected_layout="mono", output_sample_rate=24000, output_frame_size=480) -> None:
+        super().__init__(expected_layout, output_sample_rate, output_frame_size, input_sample_rate=24000)
+        self.config = GeminiConfig()
+        self.ws = None
+        self.all_output_data = None
+        self.audio_processor = AudioProcessor()
+
+    def copy(self):
+        """Creates a copy of the GeminiHandler instance."""
+        return GeminiHandler(
+            expected_layout=self.expected_layout,
+            output_sample_rate=self.output_sample_rate,
+            output_frame_size=self.output_frame_size,
+        )
+
+    def _initialize_websocket(self):
+        """Initializes the WebSocket connection to the Gemini API."""
+        try:
+            self.ws = websockets.sync.client.connect(self.config.ws_url, timeout=3000)
+            initial_request = {"setup": {"model": self.config.model,"tools":[{"google_search": {}}]}}
+            self.ws.send(json.dumps(initial_request))
+            setup_response = json.loads(self.ws.recv())
+            print(f"Setup response: {setup_response}")
+        except websockets.exceptions.WebSocketException as e:
+            print(f"WebSocket connection failed: {str(e)}")
+            self.ws = None
+        except Exception as e:
+            print(f"Setup failed: {str(e)}")
+            self.ws = None
+
+def receive(self, frame: tuple[int, np.ndarray]) -> None:
+    """Empfängt Audio-/Videodaten, kodiert sie und sendet sie an die Gemini API."""
+    try:
+        if not self.ws:
+            self._initialize_websocket()
+            if not self.ws:  # Überprüfen, ob die Verbindung erfolgreich ist
+                print("WebSocket-Verbindung konnte nicht hergestellt werden.")
+                return  # Frühzeitiger Rückkehr, wenn die Verbindung fehlschlägt
+
+        sample_rate, array = frame
+        message = {"realtimeInput": {"mediaChunks": []}}
+
+        if sample_rate > 0 and array is not None:
+            array = array.squeeze()
+            audio_data = self.audio_processor.encode_audio(array, self.output_sample_rate)
+            message["realtimeInput"]["mediaChunks"].append({
+                "mimeType": f"audio/pcm;rate={self.output_sample_rate}",
+                "data": audio_data["realtimeInput"]["mediaChunks"][0]["data"],
+            })
+
+        if message["realtimeInput"]["mediaChunks"]:
+            self.ws.send(json.dumps(message))
+    except Exception as e:
+        print(f"Fehler beim Empfangen: {str(e)}")
+        if self.ws:
+            self.ws.close()
+        self.ws = None
+
+
+    def _process_server_content(self, content):
+        """Processes audio output data from the WebSocket response."""
+        for part in content.get("parts", []):
+            data = part.get("inlineData", {}).get("data", "")
+            if data:
+                audio_array = self.audio_processor.process_audio_response(data)
+                if self.all_output_data is None:
+                    self.all_output_data = audio_array
+                else:
+                    self.all_output_data = np.concatenate((self.all_output_data, audio_array))
+
+                while self.all_output_data.shape[-1] >= self.output_frame_size:
+                    yield (self.output_sample_rate, self.all_output_data[: self.output_frame_size].reshape(1, -1))
+                    self.all_output_data = self.all_output_data[self.output_frame_size :]
+
+    def generator(self):
+        """Generates audio output from the WebSocket stream."""
+        while True:
+            if not self.ws:
+                print("WebSocket not connected")
+                yield None
+                continue
+
+            try:
+                message = self.ws.recv(timeout=30)
+                msg = json.loads(message)
+                if "serverContent" in msg:
+                    content = msg["serverContent"].get("modelTurn", {})
+                    yield from self._process_server_content(content)
+            except TimeoutError:
+                print("Timeout waiting for server response")
+                yield None
+            except Exception as e:
+                yield None
+
+    def emit(self) -> tuple[int, np.ndarray] | None:
+        """Emits the next audio chunk from the generator."""
+        if not self.ws:
+            return None
+        if not hasattr(self, "_generator"):
+            self._generator = self.generator()
+        try:
+            return next(self._generator)
+        except StopIteration:
+            self.reset()
+            return None
+
+    def reset(self) -> None:
+        """Resets the generator and output data."""
+        if hasattr(self, "_generator"):
+            delattr(self, "_generator")
+        self.all_output_data = None
+
+    def shutdown(self) -> None:
+        """Closes the WebSocket connection."""
+        if self.ws:
+            self.ws.close()
+
+    def check_connection(self):
+        """Checks if the WebSocket connection is active."""
+        try:
+            if not self.ws or self.ws.closed:
+                self._initialize_websocket()
+            return True
+        except Exception as e:
+            print(f"Connection check failed: {str(e)}")
+            return False
+
+# Main Gradio Interface
+def registry(
+        name: str,
+        token: str | None = None,
+        **kwargs
+):
+    """Sets up and returns the Gradio interface."""
+    api_key = token or os.environ.get(KEY_NAME)
+    if not api_key:
+        raise ValueError(f"{KEY_NAME} environment variable is not set.")
+
+    interface = gr.Blocks()
+    with interface:
+        with gr.Tabs():
+            with gr.TabItem("Voice Chat"):
+                gr.HTML(
+                    """
+                    <div style='text-align: left'>
+                        <h1>Gemini API Voice Chat</h1>
+                    </div>
+                    """
+                )
+                gemini_handler = GeminiHandler()
+                with gr.Row():
+                    audio = WebRTC(label="Voice Chat", modality="audio", mode="send-receive")
+
+                audio.stream(
+                    gemini_handler,
+                    inputs=[audio],
+                    outputs=[audio],
+                    time_limit=600,
+                    concurrency_limit=10
+                )
+    return interface
+
+# Launch the Gradio interface
+gr.load(
+    name='gemini-2.0-flash-exp',
+    src=registry,
+).launch()