#ifndef _BMUSB_H
#define _BMUSB_H
+#include <libusb.h>
#include <stdint.h>
#include <atomic>
#include <condition_variable>
#include <deque>
#include <functional>
+#include <map>
#include <mutex>
#include <stack>
#include <string>
#include <thread>
#include <vector>
-struct libusb_transfer;
+namespace bmusb {
+
+class BMUSBCapture;
// An interface for frame allocators; if you do not specify one
// (using set_video_frame_allocator), a default one that pre-allocates
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.
+// 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
+// starts (so it will always be >= height/2 + extra_lines_top).
struct VideoFormat {
uint16_t id = 0; // For debugging/logging only.
unsigned width = 0, height = 0, second_field_start = 0;
unsigned frame_rate_nom = 0, frame_rate_den = 0;
bool interlaced = false;
bool has_signal = false;
+ bool is_connected = true; // If false, then has_signal makes no sense.
};
struct AudioFormat {
FrameAllocator::Frame audio_frame, size_t audio_offset, AudioFormat audio_format)>
frame_callback_t;
+typedef std::function<void(libusb_device *dev)> card_connected_callback_t;
+typedef std::function<void()> card_disconnected_callback_t;
+
class CaptureInterface {
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;
virtual void start_bm_capture() = 0;
virtual void stop_dequeue_thread() = 0;
+
+ // If a card is disconnected, it cannot come back; you should call stop_dequeue_thread()
+ // and delete it.
+ virtual bool get_disconnected() const = 0;
};
// The actual capturing class, representing capture from a single card.
class BMUSBCapture : public CaptureInterface {
public:
- BMUSBCapture(int card_index)
- : card_index(card_index)
+ BMUSBCapture(int card_index, libusb_device *dev = nullptr)
+ : card_index(card_index), dev(dev)
{
}
~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
{
video_frame_allocator = allocator;
+ if (owned_video_frame_allocator.get() != allocator) {
+ owned_video_frame_allocator.reset();
+ }
}
FrameAllocator *get_video_frame_allocator() override
void set_audio_frame_allocator(FrameAllocator *allocator) override
{
audio_frame_allocator = allocator;
+ if (owned_audio_frame_allocator.get() != allocator) {
+ owned_audio_frame_allocator.reset();
+ }
}
FrameAllocator *get_audio_frame_allocator() override
void configure_card() override;
void start_bm_capture() override;
void stop_dequeue_thread() override;
+ bool get_disconnected() const override { return disconnected; }
// TODO: It's rather messy to have these outside the interface.
static void start_bm_thread();
static void stop_bm_thread();
+ // Hotplug event (for devices being inserted between start_bm_thread()
+ // and stop_bm_thread()); entirely optional, but must be set before
+ // start_bm_capture(). Note that your callback should do as little work
+ // as possible, since the callback comes from the main USB handling
+ // thread, which is very time-sensitive.
+ //
+ // The callback function transfers ownership. If you don't want to hold
+ // on to the device given to you in the callback, you need to call
+ // libusb_unref_device().
+ static void set_card_connected_callback(card_connected_callback_t callback)
+ {
+ card_connected_callback = callback;
+ }
+
+ // Similar to set_card_connected_callback(), with the same caveats.
+ // (Note that this is set per-card and not global, as it is logically
+ // connected to an existing BMUSBCapture object.)
+ void set_card_disconnected_callback(card_disconnected_callback_t callback)
+ {
+ card_disconnected_callback = callback;
+ }
+
private:
struct QueuedFrame {
uint16_t timecode;
static void usb_thread_func();
static void cb_xfr(struct libusb_transfer *xfr);
+ static int cb_hotplug(libusb_context *ctx, libusb_device *dev, libusb_hotplug_event event, void *user_data);
+
+ void update_capture_mode();
std::string description;
FrameAllocator *video_frame_allocator = nullptr;
FrameAllocator *audio_frame_allocator = nullptr;
+ std::unique_ptr<FrameAllocator> owned_video_frame_allocator;
+ std::unique_ptr<FrameAllocator> owned_audio_frame_allocator;
frame_callback_t frame_callback = nullptr;
+ static card_connected_callback_t card_connected_callback;
+ card_disconnected_callback_t card_disconnected_callback = nullptr;
std::thread dequeue_thread;
std::atomic<bool> dequeue_thread_should_quit;
static constexpr int NUM_BMUSB_REGISTERS = 60;
uint8_t register_file[NUM_BMUSB_REGISTERS];
- int card_index;
+ // If <dev> is nullptr, will choose device number <card_index> from the list
+ // of available devices on the system. <dev> is not used after configure_card()
+ // (it will be unref-ed).
+ int card_index = -1;
+ libusb_device *dev = nullptr;
+
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.
+
+ bool disconnected = false;
};
-// Get details for the given video format; returns false if detection was incomplete.
-// 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
-// starts (so it will always be >= height/2 + extra_lines_top).
-bool decode_video_format(uint16_t video_format, VideoFormat *decoded_video_format);
+} // namespace bmusb
#endif
projects / bmusb / blobdiff