Initial commit

main/audio/wake_words/esp_wake_word.cc

@@ -0,0 +1,110 @@
+#include "esp_wake_word.h"
+#include <esp_log.h>
+
+
+#define TAG "EspWakeWord"
+
+EspWakeWord::EspWakeWord() {
+}
+
+EspWakeWord::~EspWakeWord() {
+    if (wakenet_data_ != nullptr) {
+        wakenet_iface_->destroy(wakenet_data_);
+        esp_srmodel_deinit(wakenet_model_);
+    }
+}
+
+bool EspWakeWord::Initialize(AudioCodec* codec, srmodel_list_t* models_list) {
+    codec_ = codec;
+
+    if (models_list == nullptr) {
+        wakenet_model_ = esp_srmodel_init("model");
+    } else {
+        wakenet_model_ = models_list;
+    }
+
+    if (wakenet_model_ == nullptr || wakenet_model_->num == -1) {
+        ESP_LOGE(TAG, "Failed to initialize wakenet model");
+        return false;
+    }
+    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 false;
+    }
+    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);
+
+    return true;
+}
+
+void EspWakeWord::OnWakeWordDetected(std::function<void(const std::string& wake_word)> callback) {
+    wake_word_detected_callback_ = callback;
+}
+
+void EspWakeWord::Start() {
+    running_ = true;
+}
+
+void EspWakeWord::Stop() {
+    running_ = false;
+
+    std::lock_guard<std::mutex> lock(input_buffer_mutex_);
+    input_buffer_.clear();
+}
+
+void EspWakeWord::Feed(const std::vector<int16_t>& data) {
+    if (wakenet_data_ == nullptr) {
+        return;
+    }
+
+    std::lock_guard<std::mutex> lock(input_buffer_mutex_);
+    // Check running state inside lock to avoid TOCTOU race with Stop()
+    if (!running_) {
+        return;
+    }
+
+    if (codec_->input_channels() == 2) {
+        for (size_t i = 0; i < data.size(); i += 2) {
+            input_buffer_.push_back(data[i]);
+        }
+    } else {
+        input_buffer_.insert(input_buffer_.end(), data.begin(), data.end());
+    }
+
+    int chunksize = wakenet_iface_->get_samp_chunksize(wakenet_data_);
+    while (input_buffer_.size() >= chunksize) {
+        int res = wakenet_iface_->detect(wakenet_data_, input_buffer_.data());
+        if (res > 0) {
+            last_detected_wake_word_ = wakenet_iface_->get_word_name(wakenet_data_, res);
+            running_ = false;
+            input_buffer_.clear();
+
+            if (wake_word_detected_callback_) {
+                wake_word_detected_callback_(last_detected_wake_word_);
+            }
+            break;
+        }
+        input_buffer_.erase(input_buffer_.begin(), input_buffer_.begin() + chunksize);
+    }
+}
+
+size_t EspWakeWord::GetFeedSize() {
+    if (wakenet_data_ == nullptr) {
+        return 0;
+    }
+    return wakenet_iface_->get_samp_chunksize(wakenet_data_);
+}
+
+void EspWakeWord::EncodeWakeWordData() {
+}
+
+bool EspWakeWord::GetWakeWordOpus(std::vector<uint8_t>& opus) {
+    return false;
+}