4 // The actual video mixer, running in its own separate background thread.
8 #include <movit/effect_chain.h>
12 #include "h264encode.h"
13 #include "pbo_frame_allocator.h"
14 #include "ref_counted_gl_sync.h"
26 // The surface format is used for offscreen destinations for OpenGL contexts we need.
27 Mixer(const QSurfaceFormat &format);
37 void cut(Source source);
41 RefCountedGLsync ready_fence; // Asserted when the texture is done rendering.
43 // Implicitly frees the previous one if there's a new frame available.
44 bool get_display_frame(DisplayFrame *frame);
46 typedef std::function<void()> new_frame_ready_callback_t;
47 void set_frame_ready_fallback(new_frame_ready_callback_t callback);
50 void bm_frame(int card_index, uint16_t timecode,
51 FrameAllocator::Frame video_frame, size_t video_offset, uint16_t video_format,
52 FrameAllocator::Frame audio_frame, size_t audio_offset, uint16_t audio_format);
53 void place_rectangle(movit::Effect *resample_effect, movit::Effect *padding_effect, float x0, float y0, float x1, float y1);
55 void subsample_chroma(GLuint src_tex, GLuint dst_dst);
57 QSurface *mixer_surface, *h264_encoder_surface;
58 std::unique_ptr<movit::ResourcePool> resource_pool;
59 std::unique_ptr<movit::EffectChain> chain;
60 GLuint cbcr_program_num; // Owned by <resource_pool>.
61 std::unique_ptr<H264Encoder> h264_encoder;
63 // Effects part of <chain>. Owned by <chain>.
64 movit::YCbCrInput *input[NUM_CARDS];
65 movit::Effect *resample_effect, *resample2_effect;
66 movit::Effect *padding_effect, *padding2_effect;
68 Source current_source = SOURCE_INPUT1;
71 std::mutex display_frame_mutex;
72 DisplayFrame current_display_frame, ready_display_frame; // protected by <frame_mutex>
73 bool has_current_display_frame = false, has_ready_display_frame = false; // protected by <frame_mutex>
75 std::mutex bmusb_mutex;
78 std::unique_ptr<PBOFrameAllocator> frame_allocator;
81 bool thread_initialized = false;
83 QOpenGLContext *context;
85 bool new_data_ready = false; // Whether new_frame contains anything.
86 FrameAllocator::Frame new_frame;
87 GLsync new_data_ready_fence; // Whether new_frame is ready for rendering.
88 std::condition_variable new_data_ready_changed; // Set whenever new_data_ready is changed.
90 CaptureCard cards[NUM_CARDS]; // protected by <bmusb_mutex>
92 FrameAllocator::Frame bmusb_current_rendering_frame[NUM_CARDS];
94 new_frame_ready_callback_t new_frame_ready_callback;
95 bool has_new_frame_ready_callback = false;
97 std::thread mixer_thread;
98 bool should_quit = false;
101 extern Mixer *global_mixer;
103 #endif // !defined(_MIXER_H)