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#pragma once
#include <memory>
#include <cstdint>
#include <mutex>
#include <condition_variable>
struct FrameQueue;
struct libusb_device;
struct libusb_transfer;
struct libusb_device_handle;
#ifdef _WIN32
# define USB_CALLBACK __stdcall
#else
# define USB_CALLBACK
#endif
struct URBDesc
{
URBDesc() = default;
~URBDesc();
bool start_transfers(libusb_device_handle *handle, uint32_t curr_frame_size);
void free_transfers();
void close_transfers();
FrameQueue& queue() { return *frame_queue; }
private:
enum {
TRANSFER_SIZE = 65536,
NUM_TRANSFERS = 5,
};
/* packet types when moving from iso buf to frame buf */
enum gspca_packet_type {
DISCARD_PACKET,
FIRST_PACKET,
INTER_PACKET,
LAST_PACKET,
};
std::shared_ptr<FrameQueue> frame_queue;
std::mutex num_active_transfers_mutex;
std::condition_variable num_active_transfers_condition;
gspca_packet_type last_packet_type = DISCARD_PACKET;
libusb_transfer* xfers[NUM_TRANSFERS] {};
uint8_t* cur_frame_start = nullptr;
uint32_t cur_frame_data_len = 0;
uint32_t frame_size = 0;
uint32_t last_pts = 0;
uint16_t last_fid = 0;
uint8_t transfer_buffer[TRANSFER_SIZE * NUM_TRANSFERS];
uint8_t num_active_transfers = 0;
bool teardown = false;
int transfer_cancelled();
void frame_add(enum gspca_packet_type packet_type, const uint8_t *data, int len);
void pkt_scan(uint8_t *data, int len);
static uint8_t find_ep(struct libusb_device *device);
static void USB_CALLBACK transfer_completed_callback(struct libusb_transfer *xfr);
};
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