4 // The actual video mixer, running in its own separate background thread.
8 #include <movit/effect_chain.h>
9 #include <movit/flat_input.h>
12 #include "bmusb/bmusb.h"
13 #include "h264encode.h"
14 #include "pbo_frame_allocator.h"
15 #include "ref_counted_frame.h"
16 #include "ref_counted_gl_sync.h"
18 #include "resampler.h"
32 // The surface format is used for offscreen destinations for OpenGL contexts we need.
33 Mixer(const QSurfaceFormat &format);
38 void transition_clicked(int transition_num);
39 void channel_clicked(int preview_num);
52 // The chain for rendering this frame. To render a display frame,
53 // first wait for <ready_fence>, then call <setup_chain>
54 // to wire up all the inputs, and then finally call
55 // chain->render_to_screen() or similar.
56 movit::EffectChain *chain;
57 std::function<void()> setup_chain;
59 // Asserted when all the inputs are ready; you cannot render the chain
61 RefCountedGLsync ready_fence;
63 // Holds on to all the input frames needed for this display frame,
64 // so they are not released while still rendering.
65 std::vector<RefCountedFrame> input_frames;
67 // Textures that should be released back to the resource pool
68 // when this frame disappears, if any.
69 // TODO: Refcount these as well?
70 std::vector<GLuint> temp_textures;
72 // Implicitly frees the previous one if there's a new frame available.
73 bool get_display_frame(Output output, DisplayFrame *frame) {
74 return output_channel[output].get_display_frame(frame);
77 typedef std::function<void()> new_frame_ready_callback_t;
78 void set_frame_ready_callback(Output output, new_frame_ready_callback_t callback)
80 output_channel[output].set_frame_ready_callback(callback);
83 std::vector<std::string> get_transition_names()
85 return theme->get_transition_names(pts());
89 void bm_frame(int card_index, uint16_t timecode,
90 FrameAllocator::Frame video_frame, size_t video_offset, uint16_t video_format,
91 FrameAllocator::Frame audio_frame, size_t audio_offset, uint16_t audio_format);
92 void place_rectangle(movit::Effect *resample_effect, movit::Effect *padding_effect, float x0, float y0, float x1, float y1);
94 void subsample_chroma(GLuint src_tex, GLuint dst_dst);
95 void release_display_frame(DisplayFrame *frame);
96 double pts() { return double(pts_int) / TIMEBASE; }
100 QSurface *mixer_surface, *h264_encoder_surface;
101 std::unique_ptr<movit::ResourcePool> resource_pool;
102 std::unique_ptr<Theme> theme;
103 std::unique_ptr<movit::EffectChain> display_chain;
104 GLuint cbcr_program_num; // Owned by <resource_pool>.
105 std::unique_ptr<H264Encoder> h264_encoder;
107 // Effects part of <display_chain>. Owned by <display_chain>.
108 movit::FlatInput *display_input;
110 int64_t pts_int = 0; // In TIMEBASE units.
112 std::mutex bmusb_mutex;
115 std::unique_ptr<PBOFrameAllocator> frame_allocator;
117 // Stuff for the OpenGL context (for texture uploading).
119 QOpenGLContext *context;
121 bool new_data_ready = false; // Whether new_frame and new_frame_audio contains anything.
122 bool should_quit = false;
123 RefCountedFrame new_frame;
124 GLsync new_data_ready_fence; // Whether new_frame is ready for rendering.
125 std::vector<float> new_frame_audio;
126 std::condition_variable new_data_ready_changed; // Set whenever new_data_ready is changed.
127 unsigned dropped_frames = 0; // Before new_frame.
129 std::mutex audio_mutex;
130 std::unique_ptr<Resampler> resampler; // Under audio_mutex.
131 int last_timecode = -1; // Unwrapped.
133 CaptureCard cards[NUM_CARDS]; // protected by <bmusb_mutex>
135 RefCountedFrame bmusb_current_rendering_frame[NUM_CARDS];
137 class OutputChannel {
140 void output_frame(DisplayFrame frame);
141 bool get_display_frame(DisplayFrame *frame);
142 void set_frame_ready_callback(new_frame_ready_callback_t callback);
147 Mixer *parent = nullptr; // Not owned.
148 std::mutex frame_mutex;
149 DisplayFrame current_frame, ready_frame; // protected by <frame_mutex>
150 bool has_current_frame = false, has_ready_frame = false; // protected by <frame_mutex>
151 new_frame_ready_callback_t new_frame_ready_callback;
152 bool has_new_frame_ready_callback = false;
154 OutputChannel output_channel[NUM_OUTPUTS];
156 std::thread mixer_thread;
157 bool should_quit = false;
160 extern Mixer *global_mixer;
162 #endif // !defined(_MIXER_H)