Add wake word to xmini-c3 (#730)

* esp-hi: MCP protocol is not ready yet

* Add wake word to xmini-c3

main/audio_processing/esp_wake_word.cc

@@ -0,0 +1,88 @@
+#include "esp_wake_word.h"
+#include "application.h"
+
+#include <esp_log.h>
+#include <model_path.h>
+#include <arpa/inet.h>
+#include <sstream>
+
+#define DETECTION_RUNNING_EVENT 1
+
+#define TAG "EspWakeWord"
+
+EspWakeWord::EspWakeWord() {
+    event_group_ = xEventGroupCreate();
+}
+
+EspWakeWord::~EspWakeWord() {
+    if (wakenet_data_ != nullptr) {
+        wakenet_iface_->destroy(wakenet_data_);
+        esp_srmodel_deinit(wakenet_model_);
+    }
+
+    vEventGroupDelete(event_group_);
+}
+
+void EspWakeWord::Initialize(AudioCodec* codec) {
+    codec_ = codec;
+
+    wakenet_model_ = esp_srmodel_init("model");
+
+    if(wakenet_model_->num > 1) {
+        ESP_LOGW(TAG, "More than one model found, using the first one");
+    } else if (wakenet_model_->num == 0) {
+        ESP_LOGE(TAG, "No model found");
+        return;
+    }
+    char *model_name = wakenet_model_->model_name[0];
+    wakenet_iface_ = (esp_wn_iface_t*)esp_wn_handle_from_name(model_name);
+    wakenet_data_ = wakenet_iface_->create(model_name, DET_MODE_95);
+
+    int frequency = wakenet_iface_->get_samp_rate(wakenet_data_);
+    int audio_chunksize = wakenet_iface_->get_samp_chunksize(wakenet_data_);
+    ESP_LOGI(TAG, "Wake word(%s),freq: %d, chunksize: %d", model_name, frequency, audio_chunksize);
+}
+
+void EspWakeWord::OnWakeWordDetected(std::function<void(const std::string& wake_word)> callback) {
+    wake_word_detected_callback_ = callback;
+}
+
+void EspWakeWord::StartDetection() {
+    ESP_LOGI(TAG, "Start wake word detection");
+    xEventGroupSetBits(event_group_, DETECTION_RUNNING_EVENT);
+}
+
+void EspWakeWord::StopDetection() {
+    ESP_LOGI(TAG, "Stop wake word detection");
+    xEventGroupClearBits(event_group_, DETECTION_RUNNING_EVENT);
+}
+
+bool EspWakeWord::IsDetectionRunning() {
+    return xEventGroupGetBits(event_group_) & DETECTION_RUNNING_EVENT;
+}
+
+void EspWakeWord::Feed(const std::vector<int16_t>& data) {
+    int res = wakenet_iface_->detect(wakenet_data_, (int16_t *)data.data());
+    if (res > 0) {
+        StopDetection();
+        last_detected_wake_word_ = wakenet_iface_->get_word_name(wakenet_data_, res);
+
+        if (wake_word_detected_callback_) {
+            wake_word_detected_callback_(last_detected_wake_word_);
+        }
+    }
+}
+
+size_t EspWakeWord::GetFeedSize() {
+    if (wakenet_data_ == nullptr) {
+        return 0;
+    }
+    return wakenet_iface_->get_samp_chunksize(wakenet_data_) * codec_->input_channels();
+}
+
+void EspWakeWord::EncodeWakeWordData() {
+}
+
+bool EspWakeWord::GetWakeWordOpus(std::vector<uint8_t>& opus) {
+    return false;
+}