git.sesse.net Git - nageru/blob - mixer.h

   1 #ifndef _MIXER_H
   2 #define _MIXER_H 1
   3
   4 // The actual video mixer, running in its own separate background thread.
   5
   6 #include <epoxy/gl.h>
   7 #undef Success
   8 #include <movit/effect_chain.h>
   9 #include <movit/flat_input.h>
  10 #include <functional>
  11
  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"
  17 #include "theme.h"
  18 #include "resampler.h"
  19 #include "timebase.h"
  20 #include "httpd.h"
  21 #include "ebu_r128_proc.h"
  22
  23 namespace movit {
  24 class YCbCrInput;
  25 }
  26 class QOpenGLContext;
  27 class QSurfaceFormat;
  28
  29 class Mixer {
  30 public:
  31         // The surface format is used for offscreen destinations for OpenGL contexts we need.
  32         Mixer(const QSurfaceFormat &format, unsigned num_cards);
  33         ~Mixer();
  34         void start();
  35         void quit();
  36
  37         void transition_clicked(int transition_num);
  38         void channel_clicked(int preview_num);
  39
  40         enum Output {
  41                 OUTPUT_LIVE = 0,
  42                 OUTPUT_PREVIEW,
  43                 OUTPUT_INPUT0,
  44                 OUTPUT_INPUT1,
  45                 OUTPUT_INPUT2,
  46                 OUTPUT_INPUT3,
  47                 NUM_OUTPUTS
  48         };
  49
  50         struct DisplayFrame {
  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;
  57
  58                 // Asserted when all the inputs are ready; you cannot render the chain
  59                 // before this.
  60                 RefCountedGLsync ready_fence;
  61
  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;
  65
  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;
  70         };
  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);
  74         }
  75
  76         typedef std::function<void()> new_frame_ready_callback_t;
  77         void set_frame_ready_callback(Output output, new_frame_ready_callback_t callback)
  78         {
  79                 output_channel[output].set_frame_ready_callback(callback);
  80         }
  81
  82         typedef std::function<void(float, float, float, float, float)> audio_level_callback_t;
  83         void set_audio_level_callback(audio_level_callback_t callback)
  84         {
  85                 audio_level_callback = callback;
  86         }
  87
  88         std::vector<std::string> get_transition_names()
  89         {
  90                 return theme->get_transition_names(pts());
  91         }
  92
  93 private:
  94         void bm_frame(unsigned card_index, uint16_t timecode,
  95                 FrameAllocator::Frame video_frame, size_t video_offset, uint16_t video_format,
  96                 FrameAllocator::Frame audio_frame, size_t audio_offset, uint16_t audio_format);
  97         void place_rectangle(movit::Effect *resample_effect, movit::Effect *padding_effect, float x0, float y0, float x1, float y1);
  98         void thread_func();
  99         void subsample_chroma(GLuint src_tex, GLuint dst_dst);
 100         void release_display_frame(DisplayFrame *frame);
 101         double pts() { return double(pts_int) / TIMEBASE; }
 102
 103         HTTPD httpd;
 104         unsigned num_cards;
 105
 106         QSurface *mixer_surface, *h264_encoder_surface;
 107         std::unique_ptr<movit::ResourcePool> resource_pool;
 108         std::unique_ptr<Theme> theme;
 109         std::unique_ptr<movit::EffectChain> display_chain;
 110         GLuint cbcr_program_num;  // Owned by <resource_pool>.
 111         std::unique_ptr<H264Encoder> h264_encoder;
 112
 113         // Effects part of <display_chain>. Owned by <display_chain>.
 114         movit::FlatInput *display_input;
 115
 116         int64_t pts_int = 0;  // In TIMEBASE units.
 117
 118         std::mutex bmusb_mutex;
 119         struct CaptureCard {
 120                 BMUSBCapture *usb;
 121                 std::unique_ptr<PBOFrameAllocator> frame_allocator;
 122
 123                 // Stuff for the OpenGL context (for texture uploading).
 124                 QSurface *surface;
 125                 QOpenGLContext *context;
 126
 127                 bool new_data_ready = false;  // Whether new_frame and new_frame_audio contains anything.
 128                 bool should_quit = false;
 129                 RefCountedFrame new_frame;
 130                 GLsync new_data_ready_fence;  // Whether new_frame is ready for rendering.
 131                 std::vector<float> new_frame_audio;
 132                 std::condition_variable new_data_ready_changed;  // Set whenever new_data_ready is changed.
 133                 unsigned dropped_frames = 0;  // Before new_frame.
 134
 135                 std::mutex audio_mutex;
 136                 std::unique_ptr<Resampler> resampler;  // Under audio_mutex.
 137                 int last_timecode = -1;  // Unwrapped.
 138         };
 139         CaptureCard cards[MAX_CARDS];  // protected by <bmusb_mutex>
 140
 141         RefCountedFrame bmusb_current_rendering_frame[MAX_CARDS];
 142
 143         class OutputChannel {
 144         public:
 145                 ~OutputChannel();
 146                 void output_frame(DisplayFrame frame);
 147                 bool get_display_frame(DisplayFrame *frame);
 148                 void set_frame_ready_callback(new_frame_ready_callback_t callback);
 149
 150         private:
 151                 friend class Mixer;
 152
 153                 Mixer *parent = nullptr;  // Not owned.
 154                 std::mutex frame_mutex;
 155                 DisplayFrame current_frame, ready_frame;  // protected by <frame_mutex>
 156                 bool has_current_frame = false, has_ready_frame = false;  // protected by <frame_mutex>
 157                 new_frame_ready_callback_t new_frame_ready_callback;
 158                 bool has_new_frame_ready_callback = false;
 159         };
 160         OutputChannel output_channel[NUM_OUTPUTS];
 161
 162         std::thread mixer_thread;
 163         bool should_quit = false;
 164
 165         audio_level_callback_t audio_level_callback = nullptr;
 166         Ebu_r128_proc r128;
 167
 168         // TODO: Implement oversampled peak detection.
 169         float peak = 0.0f;
 170 };
 171
 172 extern Mixer *global_mixer;
 173
 174 #endif  // !defined(_MIXER_H)