X-Git-Url: https://git.sesse.net/?a=blobdiff_plain;f=bmusb.h;h=9eb3ff4f716a4ede88c997f65131c6fe69232179;hb=89136643760d7da0c94c4d4fb1ec778f9cefb97f;hp=fb6f87135f514158f0fcdcd9bbbd4b5ab24655c5;hpb=cbaa849e8d1cd73fc46ed63dc3146bff92b4a991;p=bmusb

diff --git a/bmusb.h b/bmusb.h
index fb6f871..9eb3ff4 100644
--- a/bmusb.h
+++ b/bmusb.h
@@ -2,7 +2,15 @@
 #define _BMUSB_H
 
 #include <stdint.h>
+#include <atomic>
+#include <condition_variable>
+#include <deque>
 #include <functional>
+#include <mutex>
+#include <thread>
+#include <vector>
+
+struct libusb_transfer;
 
 // An interface for frame allocators; if you do not specify one
 // (using set_video_frame_allocator), a default one that pre-allocates
@@ -14,10 +22,17 @@ class FrameAllocator {
  public:
 	struct Frame {
 		uint8_t *data = nullptr;
+		uint8_t *data2 = nullptr;  // Only if interleaved == true.
 		size_t len = 0;  // Number of bytes we actually have.
 		size_t size = 0;  // Number of bytes we have room for.
+		size_t overflow = 0;
 		void *userdata = nullptr;
 		FrameAllocator *owner = nullptr;
+
+		// If set to true, every other byte will go to data and to data2.
+		// 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;
 	};
 
 	virtual ~FrameAllocator();
@@ -46,14 +61,101 @@ typedef std::function<void(uint16_t timecode,
                            FrameAllocator::Frame audio_frame, size_t audio_offset, uint16_t audio_format)>
 	frame_callback_t;
 
-void set_video_frame_allocator(FrameAllocator *allocator);  // Does not take ownership.
-FrameAllocator *get_video_frame_allocator();
+// The actual capturing class, representing capture from a single card.
+class BMUSBCapture {
+ public:
+	BMUSBCapture(int card_index)
+		: card_index(card_index)
+	{
+	}
+
+	// Does not take ownership.
+	void set_video_frame_allocator(FrameAllocator *allocator)
+	{
+		video_frame_allocator = allocator;
+	}
+
+	FrameAllocator *get_video_frame_allocator()
+	{
+		return video_frame_allocator;
+	}
+
+	// Does not take ownership.
+	void set_audio_frame_allocator(FrameAllocator *allocator)
+	{
+		audio_frame_allocator = allocator;
+	}
 
-void set_audio_frame_allocator(FrameAllocator *allocator);  // Does not take ownership.
-FrameAllocator *get_audio_frame_allocator();
+	FrameAllocator *get_audio_frame_allocator()
+	{
+		return audio_frame_allocator;
+	}
+
+	void set_frame_callback(frame_callback_t callback)
+	{
+		frame_callback = callback;
+	}
+
+	// Needs to be run before configure_card().
+	void set_dequeue_thread_callbacks(std::function<void()> init, std::function<void()> cleanup)
+	{
+		dequeue_init_callback = init;
+		dequeue_cleanup_callback = cleanup;
+		has_dequeue_callbacks = true;
+	}
+
+	void configure_card();
+	void start_bm_capture();
+	void stop_dequeue_thread();
+
+	static void start_bm_thread();
+	static void stop_bm_thread();
+
+ private:
+	struct QueuedFrame {
+		uint16_t timecode;
+		uint16_t format;
+		FrameAllocator::Frame frame;
+	};
+
+	void start_new_audio_block(const uint8_t *start);
+	void start_new_frame(const uint8_t *start);
+
+	void queue_frame(uint16_t format, uint16_t timecode, FrameAllocator::Frame frame, std::deque<QueuedFrame> *q);
+	void dequeue_thread_func();
+
+	static void usb_thread_func();
+	static void cb_xfr(struct libusb_transfer *xfr);
+
+	FrameAllocator::Frame current_video_frame;
+	FrameAllocator::Frame current_audio_frame;
+
+	std::mutex queue_lock;
+	std::condition_variable queues_not_empty;
+	std::deque<QueuedFrame> pending_video_frames;
+	std::deque<QueuedFrame> pending_audio_frames;
+
+	FrameAllocator *video_frame_allocator = nullptr;
+	FrameAllocator *audio_frame_allocator = nullptr;
+	frame_callback_t frame_callback = nullptr;
+
+	std::thread dequeue_thread;
+	std::atomic<bool> dequeue_thread_should_quit;
+	bool has_dequeue_callbacks = false;
+	std::function<void()> dequeue_init_callback = nullptr;
+	std::function<void()> dequeue_cleanup_callback = nullptr;
+
+	int current_register = 0;
+
+	static constexpr int NUM_BMUSB_REGISTERS = 60;
+	uint8_t register_file[NUM_BMUSB_REGISTERS];
+
+	int card_index;
+	std::vector<libusb_transfer *> iso_xfrs;
+};
 
-void set_frame_callback(frame_callback_t callback);
-void start_bm_capture();
-void stop_bm_capture();
+// 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.
+bool decode_video_format(uint16_t video_format, int *width, int *height, int *frame_rate_nom, int *frame_rate_den, bool *interlaced);
 
 #endif