ESP32-CAM_Audio

This sketch allows you to use the ESP32-CAM as an MJPEG & WAV streaming webserver. Audio (your voice) is captured by a microphone and stream to the WAV format.

The code was tested with :

Camera model	Camera module	Microphone
AI-Thinker ESP32-CAM	OV2640 OV5640	INMP441 MEMS microphone
XIAO_ESP32S3	OV2640 OV5640	Integrated PDM microphone

The sketch uses the basic Arduino CameraWebServer example to which I added an audio server.

ESP32-CAM Urls :

• Camera settings : http://ESPIPADDRESS
• Video stream : http://ESPIPADDRESS:81/stream
• Audio stream : http://ESPIPADDRESS:82/audio
• Video + Audio stream : http://ESPIPADDRESS:83

Video + Audio stream is made as an example but is not ideal because there is an audio delay related to the web browser buffer. I recommend using go2rtc streaming application in order to have almost ZERO latency.

Wiring

Sketch configuration

Configure your WiFi network credentials.

const char* ssid = "ssid";
const char* password = "password";

Edit the audio_server.h file.

CAMERA_MODEL_AI_THINKER

//select the pins according to your connections
#define I2S_WS            2 
#define I2S_SCK           14 
#define I2S_SD            15 

#define I2S_PORT          I2S_NUM_1
#define SAMPLE_BITS       32
.mode = (i2s_mode_t)(I2S_MODE_MASTER | I2S_MODE_RX),
.channel_format = I2S_CHANNEL_FMT_ONLY_RIGHT,

CAMERA_MODEL_XIAO_ESP32S3

#define I2S_WS            42 
#define I2S_SCK           -1
#define I2S_SD            41

#define I2S_PORT          I2S_NUM_0
#define SAMPLE_BITS       16
.mode = (i2s_mode_t)(I2S_MODE_MASTER | I2S_MODE_RX | I2S_MODE_PDM),
.channel_format = I2S_CHANNEL_FMT_ONLY_LEFT,

Usage

Here is the method I use to access the streams from a web page. In order to have a single point for broadcasting video and audio with low latency, I use go2rtc which is a camera streaming application.

• Install go2rtc
• Configure the video and audio source stream
• Custom HTML page.

Video and audio source stream configuration

You must edit the go2rtc.yaml configuration file.This can be done directly from the web interface.

1. Go to the Config menu.
2. Add the ESP32-CAM stream links.
3. Click the Save & Restart button.

streams:

  ESP32-CAM_video: http://192.168.10.55:81/stream
  ESP32-CAM_audio: http://192.168.10.55:82/audio#audio=opus

Alternative to avoid creating a custom HTML web page.

streams:

  ESP32-CAM:
    - ffmpeg:http://192.168.10.55:81/stream#video=h264
    - ffmpeg:http://192.168.10.55:82/audio#audio=opus

Link to the stream: https://go2rtc.local/stream.html?src=ESP32-CAM

Custom HTML page

The custom html page contains two Iframes that allow video and audio to be combined. Adapt the ESP32CAM_stream.html file with the following links :

• Video : https://go2rtc.local/stream.html?src=ESP32-CAM_video&mode=mjpeg
• Audio : https://go2rtc.local/stream.html?src=ESP32-CAM_audio

Home Assistant

It is also possible to integrate into Home Assistant.

Webpage card without custom HTLM page.

type: iframe
url: https://go2rtc.local/stream.html?src=ESP32-CAM
aspect_ratio: 100%