4 // The actual video mixer, running in its own separate background thread.
8 #include <movit/effect_chain.h>
9 #include <movit/flat_input.h>
13 #include "h264encode.h"
14 #include "pbo_frame_allocator.h"
15 #include "ref_counted_frame.h"
16 #include "ref_counted_gl_sync.h"
29 // The surface format is used for offscreen destinations for OpenGL contexts we need.
30 Mixer(const QSurfaceFormat &format);
40 void cut(Source source);
51 // The chain for rendering this frame. To render a display frame,
52 // first wait for <ready_fence>, then call <setup_chain>
53 // to wire up all the inputs, and then finally call
54 // chain->render_to_screen() or similar.
55 movit::EffectChain *chain;
56 std::function<void()> setup_chain;
58 // Asserted when all the inputs are ready; you cannot render the chain
60 RefCountedGLsync ready_fence;
62 // Holds on to all the input frames needed for this display frame,
63 // so they are not released while still rendering.
64 std::vector<RefCountedFrame> input_frames;
66 // Textures that should be released back to the resource pool
67 // when this frame disappears, if any.
68 // TODO: Refcount these as well?
69 std::vector<GLuint> temp_textures;
71 // Implicitly frees the previous one if there's a new frame available.
72 bool get_display_frame(Output output, DisplayFrame *frame) {
73 return output_channel[output].get_display_frame(frame);
76 typedef std::function<void()> new_frame_ready_callback_t;
77 void set_frame_ready_callback(Output output, new_frame_ready_callback_t callback)
79 output_channel[output].set_frame_ready_callback(callback);
83 void bm_frame(int card_index, uint16_t timecode,
84 FrameAllocator::Frame video_frame, size_t video_offset, uint16_t video_format,
85 FrameAllocator::Frame audio_frame, size_t audio_offset, uint16_t audio_format);
86 void place_rectangle(movit::Effect *resample_effect, movit::Effect *padding_effect, float x0, float y0, float x1, float y1);
88 void subsample_chroma(GLuint src_tex, GLuint dst_dst);
89 void release_display_frame(DisplayFrame *frame);
91 QSurface *mixer_surface, *h264_encoder_surface;
92 std::unique_ptr<movit::ResourcePool> resource_pool;
93 std::unique_ptr<Theme> theme;
94 std::unique_ptr<movit::EffectChain> display_chain;
95 std::unique_ptr<movit::EffectChain> preview0_chain;
96 std::unique_ptr<movit::EffectChain> preview1_chain;
97 GLuint cbcr_program_num; // Owned by <resource_pool>.
98 std::unique_ptr<H264Encoder> h264_encoder;
100 // Effects part of <display_chain>. Owned by <display_chain>.
101 movit::FlatInput *display_input;
103 // Effects part of <preview0_chain>. Owned by <preview0_chain>.
104 movit::YCbCrInput *preview0_input;
106 // Effects part of <preview1_chain>. Owned by <preview1_chain>.
107 movit::YCbCrInput *preview1_input;
109 Source current_source = SOURCE_INPUT1;
112 std::mutex bmusb_mutex;
115 std::unique_ptr<PBOFrameAllocator> frame_allocator;
118 bool thread_initialized = false;
120 QOpenGLContext *context;
122 bool new_data_ready = false; // Whether new_frame contains anything.
123 RefCountedFrame new_frame;
124 GLsync new_data_ready_fence; // Whether new_frame is ready for rendering.
125 std::condition_variable new_data_ready_changed; // Set whenever new_data_ready is changed.
127 CaptureCard cards[NUM_CARDS]; // protected by <bmusb_mutex>
129 RefCountedFrame bmusb_current_rendering_frame[NUM_CARDS];
131 class OutputChannel {
133 void output_frame(DisplayFrame frame);
134 bool get_display_frame(DisplayFrame *frame);
135 void set_frame_ready_callback(new_frame_ready_callback_t callback);
140 Mixer *parent = nullptr; // Not owned.
141 std::mutex frame_mutex;
142 DisplayFrame current_frame, ready_frame; // protected by <frame_mutex>
143 bool has_current_frame = false, has_ready_frame = false; // protected by <frame_mutex>
144 new_frame_ready_callback_t new_frame_ready_callback;
145 bool has_new_frame_ready_callback = false;
147 OutputChannel output_channel[NUM_OUTPUTS];
149 std::thread mixer_thread;
150 bool should_quit = false;
153 extern Mixer *global_mixer;
155 #endif // !defined(_MIXER_H)