#include <libusb.h>
#include <stdint.h>
#include <atomic>
+#include <chrono>
#include <condition_variable>
#include <deque>
#include <functional>
// If so, <len> and <size> are still about the number of total bytes
// so if size == 1024, there's 512 bytes in data and 512 in data2.
bool interleaved = false;
+
+ // At what point this frame was received. Note that this marks the
+ // _end_ of the frame being received, not the beginning.
+ // Thus, if you want to measure latency, you'll also need to include
+ // the time the frame actually took to transfer (usually 1/fps,
+ // ie., the frames are typically transferred in real time).
+ std::chrono::steady_clock::time_point received_timestamp =
+ std::chrono::steady_clock::time_point::min();
};
virtual ~FrameAllocator();
// Represents the format of an actual frame coming in.
// Note: Frame rate is _frame_ rate, not field rate. So 1080i60 gets 30/1, _not_ 60/1.
-// "second_field_start" is only valid for interlaced modes; it signifies
-// how many lines from the very top of the frame there are before the second field
+// "second_field_start" is only valid for interlaced modes. If it is 1,
+// the two fields are actually stored interlaced (ie., every other line).
+// If not, each field is stored consecutively, and it signifies how many lines
+// from the very top of the frame there are before the second field
// starts (so it will always be >= height/2 + extra_lines_top).
struct VideoFormat {
uint16_t id = 0; // For debugging/logging only.
~BMUSBCapture() {}
+ // Note: Cards could be unplugged and replugged between this call and
+ // actually opening the card (in configure_card()).
+ static unsigned num_cards();
+
std::map<uint32_t, VideoMode> get_available_video_modes() const override;
uint32_t get_current_video_mode() const override;
void set_video_mode(uint32_t video_mode_id) override;