add some code

managed_components/78__esp-opus-encoder/opus_decoder.cc

@@ -0,0 +1,50 @@
+#include "opus_decoder.h"
+#include <esp_log.h>
+
+#define TAG "OpusDecoderWrapper"
+
+OpusDecoderWrapper::OpusDecoderWrapper(int sample_rate, int channels, int duration_ms)
+    : sample_rate_(sample_rate), duration_ms_(duration_ms) {
+    int error;
+    audio_dec_ = opus_decoder_create(sample_rate, channels, &error);
+    if (audio_dec_ == nullptr) {
+        ESP_LOGE(TAG, "Failed to create audio decoder, error code: %d", error);
+        return;
+    }
+
+    frame_size_ = sample_rate / 1000 * channels * duration_ms;
+}
+
+OpusDecoderWrapper::~OpusDecoderWrapper() {
+    std::lock_guard<std::mutex> lock(mutex_);
+    if (audio_dec_ != nullptr) {
+        opus_decoder_destroy(audio_dec_);
+    }
+}
+
+bool OpusDecoderWrapper::Decode(std::vector<uint8_t>&& opus, std::vector<int16_t>& pcm) {
+    std::lock_guard<std::mutex> lock(mutex_);
+    if (audio_dec_ == nullptr) {
+        ESP_LOGE(TAG, "Audio decoder is not configured");
+        return false;
+    }
+
+    pcm.resize(frame_size_);
+    auto ret = opus_decode(audio_dec_, opus.data(), opus.size(), pcm.data(), pcm.size(), 0);
+    if (ret < 0) {
+        ESP_LOGE(TAG, "Failed to decode audio, error code: %d", ret);
+        return false;
+    }
+
+    // Resize the pcm vector to the actual decoded samples
+    pcm.resize(ret);
+    return true;
+}
+
+void OpusDecoderWrapper::ResetState() {
+    std::lock_guard<std::mutex> lock(mutex_);
+    if (audio_dec_ != nullptr) {
+        opus_decoder_ctl(audio_dec_, OPUS_RESET_STATE);
+    }
+}
+