X-Git-Url: https://git.sesse.net/?a=blobdiff_plain;f=mixer.h;h=a177854b46cde0229ebfcb669998afea709813b7;hb=b4f16ea9f8969a3ba14be8cd9c88cfe00d19533b;hp=2c6e51c7b51179fb6ed322ed696e24437522901f;hpb=2d6d164028679a48b137ec4761e5d9d93eb7f29e;p=nageru

diff --git a/mixer.h b/mixer.h
index 2c6e51c..a177854 100644
--- a/mixer.h
+++ b/mixer.h
@@ -1,26 +1,162 @@
 #ifndef _MIXER_H
 #define _MIXER_H 1
 
+// The actual video mixer, running in its own separate background thread.
+
+#include <epoxy/gl.h>
+#undef Success
+#include <movit/effect_chain.h>
+#include <movit/flat_input.h>
+#include <functional>
+
+#include "bmusb/bmusb.h"
+#include "h264encode.h"
+#include "pbo_frame_allocator.h"
+#include "ref_counted_frame.h"
 #include "ref_counted_gl_sync.h"
+#include "theme.h"
+#include "resampler.h"
+#include "timebase.h"
+#include "httpd.h"
 
-class QSurface;
-void start_mixer(QSurface *surface, QSurface *surface2, QSurface *surface3, QSurface *surface4);
-void mixer_quit();
+#define NUM_CARDS 2
 
-enum Source {
-	SOURCE_INPUT1,
-	SOURCE_INPUT2,
-	SOURCE_SBS,
-};
-void mixer_cut(Source source);
+namespace movit {
+class YCbCrInput;
+}
+class QOpenGLContext;
+class QSurfaceFormat;
+
+class Mixer {
+public:
+	// The surface format is used for offscreen destinations for OpenGL contexts we need.
+	Mixer(const QSurfaceFormat &format);
+	~Mixer();
+	void start();
+	void quit();
+
+	void transition_clicked(int transition_num);
+	void channel_clicked(int preview_num);
+
+	enum Output {
+		OUTPUT_LIVE = 0,
+		OUTPUT_PREVIEW,
+		OUTPUT_INPUT0,
+		OUTPUT_INPUT1,
+		OUTPUT_INPUT2,
+		OUTPUT_INPUT3,
+		NUM_OUTPUTS
+	};
+
+	struct DisplayFrame {
+		// The chain for rendering this frame. To render a display frame,
+		// first wait for <ready_fence>, then call <setup_chain>
+		// to wire up all the inputs, and then finally call
+		// chain->render_to_screen() or similar.
+		movit::EffectChain *chain;
+		std::function<void()> setup_chain;
+
+		// Asserted when all the inputs are ready; you cannot render the chain
+		// before this.
+		RefCountedGLsync ready_fence;
+
+		// Holds on to all the input frames needed for this display frame,
+		// so they are not released while still rendering.
+		std::vector<RefCountedFrame> input_frames;
+
+		// Textures that should be released back to the resource pool
+		// when this frame disappears, if any.
+		// TODO: Refcount these as well?
+		std::vector<GLuint> temp_textures;
+	};
+	// Implicitly frees the previous one if there's a new frame available.
+	bool get_display_frame(Output output, DisplayFrame *frame) {
+		return output_channel[output].get_display_frame(frame);
+	}
+
+	typedef std::function<void()> new_frame_ready_callback_t;
+	void set_frame_ready_callback(Output output, new_frame_ready_callback_t callback)
+	{
+		output_channel[output].set_frame_ready_callback(callback);
+	}
+
+	std::vector<std::string> get_transition_names()
+	{
+		return theme->get_transition_names(pts());
+	}
+
+private:
+	void bm_frame(int card_index, uint16_t timecode,
+		FrameAllocator::Frame video_frame, size_t video_offset, uint16_t video_format,
+		FrameAllocator::Frame audio_frame, size_t audio_offset, uint16_t audio_format);
+	void place_rectangle(movit::Effect *resample_effect, movit::Effect *padding_effect, float x0, float y0, float x1, float y1);
+	void thread_func();
+	void subsample_chroma(GLuint src_tex, GLuint dst_dst);
+	void release_display_frame(DisplayFrame *frame);
+	double pts() { return double(pts_int) / TIMEBASE; }
+
+	HTTPD httpd;
+
+	QSurface *mixer_surface, *h264_encoder_surface;
+	std::unique_ptr<movit::ResourcePool> resource_pool;
+	std::unique_ptr<Theme> theme;
+	std::unique_ptr<movit::EffectChain> display_chain;
+	GLuint cbcr_program_num;  // Owned by <resource_pool>.
+	std::unique_ptr<H264Encoder> h264_encoder;
+
+	// Effects part of <display_chain>. Owned by <display_chain>.
+	movit::FlatInput *display_input;
+
+	int64_t pts_int = 0;  // In TIMEBASE units.
+
+	std::mutex bmusb_mutex;
+	struct CaptureCard {
+		BMUSBCapture *usb;
+		std::unique_ptr<PBOFrameAllocator> frame_allocator;
+
+		// Stuff for the OpenGL context (for texture uploading).
+		QSurface *surface;
+		QOpenGLContext *context;
+
+		bool new_data_ready = false;  // Whether new_frame and new_frame_audio contains anything.
+		bool should_quit = false;
+		RefCountedFrame new_frame;
+		GLsync new_data_ready_fence;  // Whether new_frame is ready for rendering.
+		std::vector<float> new_frame_audio;
+		std::condition_variable new_data_ready_changed;  // Set whenever new_data_ready is changed.
+		unsigned dropped_frames = 0;  // Before new_frame.
+
+		std::mutex audio_mutex;
+		std::unique_ptr<Resampler> resampler;  // Under audio_mutex.
+		int last_timecode = -1;  // Unwrapped.
+	};
+	CaptureCard cards[NUM_CARDS];  // protected by <bmusb_mutex>
+
+	RefCountedFrame bmusb_current_rendering_frame[NUM_CARDS];
+
+	class OutputChannel {
+	public:
+		~OutputChannel();
+		void output_frame(DisplayFrame frame);
+		bool get_display_frame(DisplayFrame *frame);
+		void set_frame_ready_callback(new_frame_ready_callback_t callback);
+
+	private:
+		friend class Mixer;
+
+		Mixer *parent = nullptr;  // Not owned.
+		std::mutex frame_mutex;
+		DisplayFrame current_frame, ready_frame;  // protected by <frame_mutex>
+		bool has_current_frame = false, has_ready_frame = false;  // protected by <frame_mutex>
+		new_frame_ready_callback_t new_frame_ready_callback;
+		bool has_new_frame_ready_callback = false;
+	};
+	OutputChannel output_channel[NUM_OUTPUTS];
 
-struct DisplayFrame {
-	GLuint texnum;
-	RefCountedGLsync ready_fence;  // Asserted when the texture is done rendering.
+	std::thread mixer_thread;
+	bool should_quit = false;
 };
-bool mixer_get_display_frame(DisplayFrame *frame);  // Implicitly frees the previous one if there's a new frame available.
 
-typedef std::function<void()> new_frame_ready_callback_t;
-void set_frame_ready_fallback(new_frame_ready_callback_t callback);
+extern Mixer *global_mixer;
 
 #endif  // !defined(_MIXER_H)