#include <condition_variable>
#include <deque>
#include <functional>
+#include <map>
#include <mutex>
+#include <stack>
#include <string>
#include <thread>
#include <vector>
+struct libusb_device_handle;
struct libusb_transfer;
// An interface for frame allocators; if you do not specify one
virtual void release_frame(Frame frame) = 0;
};
+// Audio is more important than video, and also much cheaper.
+// By having many more audio frames available, hopefully if something
+// starts to drop, we'll have CPU load go down (from not having to
+// process as much video) before we have to drop audio.
+#define NUM_QUEUED_VIDEO_FRAMES 16
+#define NUM_QUEUED_AUDIO_FRAMES 64
+
+class MallocFrameAllocator : public FrameAllocator {
+public:
+ MallocFrameAllocator(size_t frame_size, size_t num_queued_frames);
+ Frame alloc_frame() override;
+ void release_frame(Frame frame) override;
+
+private:
+ size_t frame_size;
+
+ std::mutex freelist_mutex;
+ std::stack<std::unique_ptr<uint8_t[]>> freelist; // All of size <frame_size>.
+};
+
+// Represents an input mode you can tune a card to.
+struct VideoMode {
+ std::string name;
+ bool autodetect = false; // If true, all the remaining fields are irrelevant.
+ unsigned width = 0, height = 0;
+ unsigned frame_rate_num = 0, frame_rate_den = 0;
+ bool interlaced = false;
+};
+
+// Represents the format of an actual frame coming in.
struct VideoFormat {
uint16_t id = 0; // For debugging/logging only.
unsigned width = 0, height = 0, second_field_start = 0;
public:
virtual ~CaptureInterface() {}
+ virtual std::map<uint32_t, VideoMode> get_available_video_modes() const = 0;
+ virtual uint32_t get_current_video_mode() const = 0;
+ virtual void set_video_mode(uint32_t video_mode_id) = 0;
+
+ virtual std::map<uint32_t, std::string> get_available_video_inputs() const = 0;
+ virtual void set_video_input(uint32_t video_input_id) = 0;
+ virtual uint32_t get_current_video_input() const = 0;
+
+ virtual std::map<uint32_t, std::string> get_available_audio_inputs() const = 0;
+ virtual void set_audio_input(uint32_t audio_input_id) = 0;
+ virtual uint32_t get_current_audio_input() const = 0;
+
// Does not take ownership.
virtual void set_video_frame_allocator(FrameAllocator *allocator) = 0;
~BMUSBCapture() {}
+ 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;
+
+ virtual std::map<uint32_t, std::string> get_available_video_inputs() const override;
+ virtual void set_video_input(uint32_t video_input_id) override;
+ virtual uint32_t get_current_video_input() const override { return current_video_input; }
+
+ virtual std::map<uint32_t, std::string> get_available_audio_inputs() const override;
+ virtual void set_audio_input(uint32_t audio_input_id) override;
+ virtual uint32_t get_current_audio_input() const override { return current_audio_input; }
+
// Does not take ownership.
void set_video_frame_allocator(FrameAllocator *allocator) override
{
static void usb_thread_func();
static void cb_xfr(struct libusb_transfer *xfr);
+ void update_capture_mode();
+
std::string description;
FrameAllocator::Frame current_video_frame;
int card_index;
std::vector<libusb_transfer *> iso_xfrs;
int assumed_frame_width = 1280;
+
+ libusb_device_handle *devh = nullptr;
+ uint32_t current_video_input = 0x00000000; // HDMI/SDI.
+ uint32_t current_audio_input = 0x00000000; // Embedded.
};
// Get details for the given video format; returns false if detection was incomplete.