Hi All,
I'm currently working on making my ESP-EYE stream via its web server.
So far, I have working video stream! However, I am now trying to get an audio stream working, and having some trouble.
To clarify here, I dont need the audio to sync up with the video. It would be great to get that working, but I am okay with a separate page/stream for audio.
I have finally managed to get audio data from the boards mic, however I am at the stage of not knowing what to do with it, and without being able to verify it in some way, I dont actually know if my data is meaningful/correctly formatted. To get it working, I have been converting the examples from esp-who's speech-wakeup. However, the wakeup sends the data to its neural network, while I dont want to do that, so i dont know if im storing it correctly, or even if my chunk size is correct.
Current code: http://github.com/DraconInteractive/ESP-EYE-Server
Look at Tester 002 specifically.
So, to the actual question. How do I turn this data into a playable format? Someone told me I should use a PCM, which I somewhat understand, but have no idea how to implement. Also, are there any tutorials out there for how to set up a web-page to receive audio and play it?
I'm sorry for the vagueness, I'm sitting here with a bunch of data and a goal, and no idea how to bridge the two.
Thanks
Dracon
Esp-EYE Microphone stream to HTTP server
Re: Esp-EYE Microphone stream to HTTP server
Hello. I have the same problem. I want to stream ADC data received by microphone on ESP32 to my web page. Did you succeed to stream?
Re: Esp-EYE Microphone stream to HTTP server
Unfortunately I did not @tandisbh. Let me know if you have any luck, its a problem im coming back to!
Re: Esp-EYE Microphone stream to HTTP server
@Dracon @tandisbh
Hello,
For a project of mine I am trying to send video and audio from an ESP32-CAM to a Webserver. Video was no problem thanks to many tutorials but as you i am struggling with audio transmission.
I found this: https://www.youtube.com/watch?v=NWdemILPp3Y which has a different goal but was helpful in so far that I am now able to send a constant frequency to my Webserver. The mic i ordered is still on the way but using its I2S interface i hope i will be able to send life audio from it.
In the video he uses PCM from the Wave Format and streams it using the HTML5 audio feature. I used a lot of his code and implemented it in my code for the video server. With that i can now send a constant frequency but technically any integer value should work. So in theory you should just be able to replace the sin-function with e.g an I2S read-function (some format converting may be required).
The one problem i encountered so far is the conflict between my audio an video stream. I don't know enough about HTML to explain it but I think it do to the while(true) loop in the stream_handler. Maybe u can switch between them but I will test it in the future.
Anyways here iss the code (without the video stream, just audio).
There is probably some stuff in there thats useless, but I'm still figuring out a lot of stuff myself.
Hope i could be of any help.
Hello,
For a project of mine I am trying to send video and audio from an ESP32-CAM to a Webserver. Video was no problem thanks to many tutorials but as you i am struggling with audio transmission.
I found this: https://www.youtube.com/watch?v=NWdemILPp3Y which has a different goal but was helpful in so far that I am now able to send a constant frequency to my Webserver. The mic i ordered is still on the way but using its I2S interface i hope i will be able to send life audio from it.
In the video he uses PCM from the Wave Format and streams it using the HTML5 audio feature. I used a lot of his code and implemented it in my code for the video server. With that i can now send a constant frequency but technically any integer value should work. So in theory you should just be able to replace the sin-function with e.g an I2S read-function (some format converting may be required).
The one problem i encountered so far is the conflict between my audio an video stream. I don't know enough about HTML to explain it but I think it do to the while(true) loop in the stream_handler. Maybe u can switch between them but I will test it in the future.
Anyways here iss the code (without the video stream, just audio).
Code: Select all
#include "esp_camera.h"
#include <WiFi.h>
#include "esp_timer.h"
#include "img_converters.h"
#include "Arduino.h"
#include "fb_gfx.h"
#include "soc/soc.h" // disable brownout problems
#include "soc/rtc_cntl_reg.h" // disable brownout problems
#include "esp_http_server.h"
#include <math.h>
// Replace with your network credentials
const char* ssid = "xxxxxxxxxxxxxxxxxxxxx";
const char* password = "xxxxxxxxxxxxxxxxxxxxxxxxxx";
//Wifi Reset Counter
int counter = 0;
httpd_handle_t camera_httpd = NULL;
httpd_handle_t audio_stream_httpd = NULL;
static const char PROGMEM INDEX_HTML[] = R"rawliteral(
<html>
<head>
<title>ESP32-CAM Robot</title>
<meta name="viewport" content="width=device-width, initial-scale=1">
<style>
body { font-family: Arial; text-align: center; margin:0px auto; padding-top: 30px; background-color:#222222}
td { padding: 8 px; }
</style>
</head>
<body>
<h1 style="color: white">ESP32-CAM Doorbell Audio</h1>
<audio controls src="" type="audio/x-wav" id="audio-wav">
<script>
function toggleCheckbox(x) {
var xhr = new XMLHttpRequest();
xhr.open("GET", "/action?go=" + x, true);
xhr.send();
}
window.onload = document.getElementById("audio-wav").src = window.location.href.slice(0, -1) + ":81/audio_stream";
</script>
</body>
</html>
)rawliteral";
//loads Webpage itself
static esp_err_t index_handler(httpd_req_t *req){
httpd_resp_set_type(req, "text/html");
return httpd_resp_send(req, (const char *)INDEX_HTML, strlen(INDEX_HTML));
}
//################################################
#define SCRATCH_BUFSIZE 8192
typedef struct {
uint32_t chunk_id;
uint32_t chunk_size;
uint32_t format;
}chunk_riff_t;
typedef struct {
uint32_t chunk_id;
uint32_t chunk_size;
uint16_t audio_format;
uint16_t num_of_channels;
uint32_t samplerate;
uint32_t byterate;
uint16_t block_align;
uint16_t bits_per_sample;
}chunk_fmt_t;
typedef struct {
uint32_t chunk_id;
uint32_t chunk_size;
}chunk_data_t;
typedef struct {
chunk_riff_t riff;
chunk_fmt_t fmt;
chunk_data_t data;
}wav_header_t;
struct streaming_wav_t{
wav_header_t hdr;
int16_t *buf;
int buf_size;
int cnt;
} ;
void streaming_wav_destroy( struct streaming_wav_t* wav ) {
free(wav->buf);
}
int streaming_wav_factor( struct streaming_wav_t* wav ) {
return (
wav->hdr.fmt.num_of_channels *
wav->hdr.fmt.bits_per_sample / 8 );
}
void streaming_wav_init( struct streaming_wav_t* wav, int buffer_size ) {
int num_channels = 1;
int bits_per_sample = 16;
int sample_rate = 8000;
wav->cnt = 0;
streaming_wav_header( wav, num_channels, bits_per_sample, sample_rate );
wav->buf = (int16_t*)malloc( buffer_size );
wav->buf_size = buffer_size / streaming_wav_factor( wav );
}
void streaming_wav_header( struct streaming_wav_t* wav, int num_channels, int bits_per_sample, int sample_rate )
{
wav_header_t* w = (wav_header_t*) &(wav->hdr);
int len = 0xFFFFFFFF;
w->riff.chunk_id = 0X46464952; // "RIFF"
w->riff.format = 0X45564157; // "WAVE"
w->riff.chunk_size = len;
w->fmt.chunk_id = 0X20746D66; // "fmt "
w->fmt.audio_format = 1;
w->fmt.bits_per_sample = bits_per_sample;
w->fmt.block_align = num_channels * bits_per_sample/8;
w->fmt.byterate = sample_rate * num_channels * bits_per_sample/8;
w->fmt.chunk_size = 16;
w->fmt.num_of_channels = num_channels;
w->fmt.samplerate = sample_rate;
w->data.chunk_id = 0X61746164;
w->data.chunk_size = len;
}
void streaming_wav_play( struct streaming_wav_t* wav, float frequency ) {
int sample_rate = wav->hdr.fmt.samplerate;
int Loop = sample_rate / frequency * 1000;
for( int j = 0 ; j < wav->buf_size ; j++ )
{
int i = wav->cnt++;
if ( wav->cnt > Loop )
wav->cnt = 0;
double sin_float = 15000 * sinf( 2 * i * M_PI / ( sample_rate / frequency ) ); //15k for Amplitude
int16_t lval = sin_float;
int16_t rval = sin_float;
if ( wav->hdr.fmt.num_of_channels == 2 ) {
wav->buf[j*2] = lval;
wav->buf[j*2+1] = rval;
} else {
wav->buf[j] = lval;
}
}
}
static esp_err_t audio_stream_handler(httpd_req_t *req)
{
Serial.println("in audio_stream_handler");
httpd_resp_set_type(req, "audio/x-wav");
streaming_wav_t wav;
Serial.println("sending header");
streaming_wav_init( &wav, SCRATCH_BUFSIZE );
httpd_resp_send_chunk(req, (const char*)&(wav.hdr), sizeof(wav.hdr));
size_t chunksize = SCRATCH_BUFSIZE;
float frequency = 600;
int cnt = 0;
while(true) { //Basically while(true)
streaming_wav_play( &wav, frequency );
if (httpd_resp_send_chunk(req, (const char*)wav.buf, chunksize) != ESP_OK) { //Sending Audio Buffer
Serial.println("File sending failed / Windows Closed");
httpd_resp_sendstr_chunk(req, NULL);
httpd_resp_send_err(req, HTTPD_500_INTERNAL_SERVER_ERROR, "Failed to send file");
streaming_wav_destroy( &wav );
return ESP_FAIL;
}
}
streaming_wav_destroy( &wav );
httpd_resp_send_chunk(req, NULL, 0);
return ESP_OK;
}
//#########################################################################
void startCameraServer(){
httpd_config_t config = HTTPD_DEFAULT_CONFIG();
config.server_port = 80;
httpd_uri_t index_uri = {
.uri = "/",
.method = HTTP_GET,
.handler = index_handler,
.user_ctx = NULL
};
httpd_uri_t audio_stream_uri = {
.uri = "/audio_stream",
.method = HTTP_GET,
.handler = audio_stream_handler,
.user_ctx = NULL
};
if (httpd_start(&camera_httpd, &config) == ESP_OK) {
httpd_register_uri_handler(camera_httpd, &index_uri);
}
config.server_port += 1;
config.ctrl_port += 1;
if (httpd_start(&audio_stream_httpd, &config) == ESP_OK) {
httpd_register_uri_handler(audio_stream_httpd, &audio_stream_uri);
}
}
//######################################################################
void setup() {
WRITE_PERI_REG(RTC_CNTL_BROWN_OUT_REG, 0); //disable brownout detector
//Enable Serial Debug
Serial.begin(115200);
Serial.setDebugOutput(false);
// Wi-Fi connection
Serial.println("");
Serial.print("Connecting to Wifi");
WiFi.begin(ssid, password);
while (WiFi.status() != WL_CONNECTED) {
delay(500);
Serial.print(".");
counter++;
if (counter == 10){
Serial.println("");
Serial.println("Could not Connect to Wifi - Restarting...");
delay(1000);
ESP.restart();
}
}
Serial.println("");
Serial.println("WiFi connected");
Serial.print("Camera Stream Ready! Go to: http://");
Serial.println(WiFi.localIP());
// Start streaming web server
startCameraServer();
}
//###################################################################
void loop() {
}
There is probably some stuff in there thats useless, but I'm still figuring out a lot of stuff myself.
Hope i could be of any help.
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