-class QSurface;
-void mixer_thread(QSurface *surface, QSurface *surface2, QSurface *surface3, QSurface *surface4);
+#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"
+
+#define NUM_CARDS 2
+
+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; }
+
+ 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];
+
+ std::thread mixer_thread;
+ bool should_quit = false;
+};
+
+extern Mixer *global_mixer;
+
+#endif // !defined(_MIXER_H)
projects / nageru / blobdiff