USBAudioHostBackend.h

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#pragma once
#include <cstddef>
#include <cstdint>
 
#include "AudioTools/Communication/USB/USBAudioBackend.h"
#include "AudioTools/Communication/USB/USBAudioConfig.h"
 
namespace audio_tools {
 
enum class UsbHostStreamRole : uint8_t {
  RxData = 0,
  TxData = 1,
  Feedback = 2
};
 
class USBAudioHostEvents {
 public:
  virtual ~USBAudioHostEvents() = default;
 
  virtual uint16_t onAttach(uint8_t daddr, uint16_t vid, uint16_t pid,
                            const uint8_t* desc, uint16_t len) = 0;
 
  virtual void onConfigured(uint8_t daddr) = 0;
 
  virtual void onDetach(uint8_t daddr) = 0;
 
  virtual void onControlComplete(bool ok, uint16_t len) = 0;
 
  virtual void onIsoIn(UsbHostStreamRole role, const uint8_t* data,
                       uint16_t len) = 0;
 
  virtual uint16_t onIsoOut(uint8_t* data, uint16_t max) = 0;
};
 
class USBAudioHostBackend {
 public:
  virtual ~USBAudioHostBackend() = default;
 
  virtual bool begin(USBAudioHostEvents* events, const USBAudioConfig& cfg) = 0;
 
  virtual void end() = 0;
 
  virtual void task() = 0;
 
  virtual bool control(uint8_t daddr, const UsbSetupPacket& setup,
                       uint8_t* data) = 0;
 
  virtual bool setInterface(uint8_t daddr, uint8_t itf, uint8_t alt) = 0;
 
  virtual bool openStream(uint8_t daddr, const UsbEndpointDescriptorView& ep,
                          UsbHostStreamRole role) = 0;
 
  virtual void closeStream(uint8_t daddr, uint8_t ep_addr) = 0;
 
  virtual UsbSpeed speed() const { return UsbSpeed::Full; }
 
  virtual uint32_t millis() const = 0;
};
 
}  // namespace audio_tools