Hello, Xiaozhi.

main/AudioDevice.h

@@ -0,0 +1,76 @@
+#ifndef _AUDIO_DEVICE_H
+#define _AUDIO_DEVICE_H
+
+#include "opus.h"
+#include "freertos/FreeRTOS.h"
+#include "freertos/queue.h"
+#include "freertos/event_groups.h"
+#include "driver/i2s_std.h"
+
+#include <vector>
+#include <string>
+#include <functional>
+
+enum AudioPacketType {
+    kAudioPacketTypeUnkonwn = 0,
+    kAudioPacketTypeStart,
+    kAudioPacketTypeStop,
+    kAudioPacketTypeData,
+    kAudioPacketTypeSentenceStart,
+    kAudioPacketTypeSentenceEnd
+};
+
+struct AudioPacket {
+    AudioPacketType type = kAudioPacketTypeUnkonwn;
+    std::string text;
+    std::vector<uint8_t> opus;
+    std::vector<int16_t> pcm;
+    uint32_t timestamp;
+};
+
+struct AudioDataHeader {
+    uint32_t version;
+    uint32_t reserved;
+    uint32_t timestamp;
+    uint32_t payload_size;
+} __attribute__((packed));
+
+class AudioDevice {
+public:
+    AudioDevice();
+    ~AudioDevice();
+
+    void Start(int input_sample_rate, int output_sample_rate);
+    int Read(int16_t* dest, int samples);
+    void Write(const int16_t* data, int samples);
+    void QueueAudioPacket(AudioPacket* packet);
+    void OnStateChanged(std::function<void()> callback);
+    void Break();
+
+    int input_sample_rate() const { return input_sample_rate_; }
+    int output_sample_rate() const { return output_sample_rate_; }
+    bool duplex() const { return duplex_; }
+    bool playing() const { return playing_; }
+
+private:
+    bool playing_ = false;
+    bool breaked_ = false;
+    bool duplex_ = false;
+    int input_sample_rate_ = 0;
+    int output_sample_rate_ = 0;
+
+    i2s_chan_handle_t tx_handle_ = nullptr;
+    i2s_chan_handle_t rx_handle_ = nullptr;
+
+    QueueHandle_t audio_play_queue_ = nullptr;
+    TaskHandle_t audio_play_task_ = nullptr;
+    
+    EventGroupHandle_t event_group_;
+    std::function<void()> on_state_changed_;
+
+    void CreateDuplexChannels();
+    void CreateSimplexChannels();
+    void AudioPlayTask();
+};
+
+#endif // _AUDIO_DEVICE_H