sender adjusts volume, readme

Author: netham45

README.md

@@ -109,7 +109,14 @@ This device is fully compatible with [ScreamRouter](https://github.com/netham45/
  - Enter the password
  - Device will connect and restart
 
-4. **Access the web interface**
+4. **Direct Connection Mode (No WiFi Network)**
+ - If you want to use the receiver without connecting it to a WiFi network:
+ - The receiver will remain in AP mode with IP address 192.168.4.1
+ - Connect your sender device to the "ESP32-Scream" AP network
+ - Configure the sender to use destination IP 192.168.4.1 and port 4010
+ - Audio streaming will work directly between the devices
+
+5. **Access the web interface**
  - Find the device's IP on your network
  - Or reconnect to "ESP32-Scream" 
  - Open the IP address in a browser

main/scream_sender.c

@@ -53,6 +53,20 @@ static esp_err_t uac_device_output_cb(uint8_t *buf, size_t len, void *arg)
 
  // Process the data in chunks
  while (s_data_in_head >= CHUNK_SIZE) {
+ // Get volume from config manager
+ app_config_t *config = config_manager_get_config();
+ float volume = config->volume;
+ 
+ if (volume < 1.0f) {
+ // Apply volume scaling for 16-bit PCM audio
+ int16_t *samples = (int16_t*)s_data_in;
+ int num_samples = CHUNK_SIZE / 2; // 2 bytes per sample for 16-bit audio
+ 
+ for (int i = 0; i < num_samples; i++) {
+ samples[i] = (int16_t)(samples[i] * volume);
+ }
+ }
+ 
  memcpy(s_data_out + HEADER_SIZE, s_data_in, CHUNK_SIZE);
 
  // Send with retry logic
@@ -112,6 +126,16 @@ static void uac_device_set_volume_cb(uint32_t volume, void *arg)
  }
 
  ESP_LOGI(TAG, "Mapped volume: %"PRIu32"", s_volume);
+ 
+ // Update config manager's volume (convert from 0-100 to 0.0-1.0 scale)
+ float config_volume = (float)s_volume / 100.0f;
+ app_config_t *config = config_manager_get_config();
+ config->volume = config_volume;
+ 
+ // Save the new volume setting to NVS
+ config_manager_save_setting("volume", &config_volume, sizeof(float));
+ 
+ ESP_LOGI(TAG, "Config volume updated to %.2f", config_volume);
 }
 
 esp_err_t scream_sender_init(void)