Add a function to get video format details.

[bmusb] / bmusb.h

diff --git a/bmusb.h b/bmusb.h
index 311248e5fddb0864b6ce3dfbf01b775474413419..9eb3ff4f716a4ede88c997f65131c6fe69232179 100644 (file)
--- 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
@@ -17,6 +25,7 @@ class FrameAllocator {
                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;
 
@@ -52,14 +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;
+       }
+
+       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;
 
-void set_audio_frame_allocator(FrameAllocator *allocator);  // Does not take ownership.
-FrameAllocator *get_audio_frame_allocator();
+       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