From c4c15eff39d8edd64993a62c2c84472da99f3e96 Mon Sep 17 00:00:00 2001
From: Filipi Fuchter <filipi87@gmail.com>
Date: Thu, 16 Jan 2025 18:30:19 -0300
Subject: [PATCH] Sending a silence frame to prevent the audio from clipping.

---
 .../server/signalling_bot.py                  | 37 ++++++++++++++++++-
 1 file changed, 35 insertions(+), 2 deletions(-)

diff --git a/examples/bot-ready-signalling/server/signalling_bot.py b/examples/bot-ready-signalling/server/signalling_bot.py
index 0a93d0cbc..23d407c05 100644
--- a/examples/bot-ready-signalling/server/signalling_bot.py
+++ b/examples/bot-ready-signalling/server/signalling_bot.py
@@ -7,13 +7,14 @@
 import asyncio
 import os
 import sys
+from dataclasses import dataclass
 
 import aiohttp
 from dotenv import load_dotenv
 from loguru import logger
 from runner import configure
 
-from pipecat.frames.frames import EndFrame, TTSSpeakFrame
+from pipecat.frames.frames import AudioRawFrame, EndFrame, OutputAudioRawFrame, TTSSpeakFrame
 from pipecat.pipeline.pipeline import Pipeline
 from pipecat.pipeline.runner import PipelineRunner
 from pipecat.pipeline.task import PipelineTask
@@ -26,6 +27,34 @@ logger.remove(0)
 logger.add(sys.stderr, level="DEBUG")
 
 
+@dataclass
+class SilenceFrame(OutputAudioRawFrame):
+    def __init__(
+        self,
+        audio: bytes = None,
+        sample_rate: int = 16000,
+        num_channels: int = 1,
+        duration: float = 0.1,
+    ):
+        # Initialize the parent class with the silent frame's data
+        super().__init__(
+            audio=self.create_silent_audio_frame(sample_rate, num_channels, duration).audio,
+            sample_rate=sample_rate,
+            num_channels=num_channels,
+        )
+
+    @staticmethod
+    def create_silent_audio_frame(
+        sample_rate: int, num_channels: int, duration: float
+    ) -> AudioRawFrame:
+        """Create an AudioRawFrame containing silence."""
+        frame_size = num_channels * 2  # 2 bytes per sample for 16-bit audio
+        total_frames = int(sample_rate * duration)
+        total_bytes = total_frames * frame_size
+        silent_audio = bytes(total_bytes)  # Create a byte array filled with zeros
+        return AudioRawFrame(audio=silent_audio, sample_rate=sample_rate, num_channels=num_channels)
+
+
 async def main():
     async with aiohttp.ClientSession() as session:
         (room_url, _) = await configure(session)
@@ -50,7 +79,11 @@ async def main():
             if "playable" not in message:
                 return
             await task.queue_frames(
-                [TTSSpeakFrame(f"Hello there, how are you doing today ?"), EndFrame()]
+                [
+                    SilenceFrame(duration=0.5),
+                    TTSSpeakFrame(f"Hello there, how are you doing today ?"),
+                    EndFrame(),
+                ]
             )
 
         await runner.run(task)