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 surfaces are used for offscreen destinations for OpenGL contexts we need.
27 // TODO: Figure out something slightly more generic.
28 Mixer(QSurface *surface1, QSurface *surface2, QSurface *surface3, QSurface *surface4);
38 void cut(Source source);
42 RefCountedGLsync ready_fence; // Asserted when the texture is done rendering.
44 // Implicitly frees the previous one if there's a new frame available.
45 bool get_display_frame(DisplayFrame *frame);
47 typedef std::function<void()> new_frame_ready_callback_t;
48 void set_frame_ready_fallback(new_frame_ready_callback_t callback);
51 void bm_frame(int card_index, uint16_t timecode,
52 FrameAllocator::Frame video_frame, size_t video_offset, uint16_t video_format,
53 FrameAllocator::Frame audio_frame, size_t audio_offset, uint16_t audio_format);
54 void place_rectangle(movit::Effect *resample_effect, movit::Effect *padding_effect, float x0, float y0, float x1, float y1);
56 void subsample_chroma(GLuint src_tex, GLuint dst_dst);
58 QSurface *surface1, *surface2, *surface3, *surface4;
59 std::unique_ptr<movit::EffectChain> chain;
60 movit::ResourcePool *resource_pool; // Owned by <chain>.
61 GLuint cbcr_program_num; // Owned by <resource_pool>.
62 std::unique_ptr<H264Encoder> h264_encoder;
64 // Effects part of <chain>. Owned by <chain>.
65 movit::YCbCrInput *input[NUM_CARDS];
66 movit::Effect *resample_effect, *resample2_effect;
67 movit::Effect *padding_effect, *padding2_effect;
69 Source current_source = SOURCE_INPUT1;
72 std::mutex display_frame_mutex;
73 DisplayFrame current_display_frame, ready_display_frame; // protected by <frame_mutex>
74 bool has_current_display_frame = false, has_ready_display_frame = false; // protected by <frame_mutex>
76 std::mutex bmusb_mutex;
79 std::unique_ptr<PBOFrameAllocator> frame_allocator;
82 bool thread_initialized = false;
84 QOpenGLContext *context;
86 bool new_data_ready = false; // Whether new_frame contains anything.
87 FrameAllocator::Frame new_frame;
88 GLsync new_data_ready_fence; // Whether new_frame is ready for rendering.
89 std::condition_variable new_data_ready_changed; // Set whenever new_data_ready is changed.
91 CaptureCard cards[NUM_CARDS]; // protected by <bmusb_mutex>
93 FrameAllocator::Frame bmusb_current_rendering_frame[NUM_CARDS];
95 new_frame_ready_callback_t new_frame_ready_callback;
96 bool has_new_frame_ready_callback = false;
98 std::thread mixer_thread;
99 bool should_quit = false;
102 extern Mixer *global_mixer;
104 #endif // !defined(_MIXER_H)