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 <stdbool.h>
   9 #include <stdint.h>
  10
  11 #include <movit/effect_chain.h>
  12 #include <movit/flat_input.h>
  13 #include <condition_variable>
  14 #include <cstddef>
  15 #include <functional>
  16 #include <memory>
  17 #include <mutex>
  18 #include <string>
  19 #include <thread>
  20 #include <vector>
  21
  22 #include "bmusb/bmusb.h"
  23 #include "ebu_r128_proc.h"
  24 #include "h264encode.h"
  25 #include "httpd.h"
  26 #include "pbo_frame_allocator.h"
  27 #include "ref_counted_frame.h"
  28 #include "ref_counted_gl_sync.h"
  29 #include "resampler.h"
  30 #include "theme.h"
  31 #include "timebase.h"
  32
  33 class H264Encoder;
  34 class QSurface;
  35 namespace movit {
  36 class Effect;
  37 class EffectChain;
  38 class FlatInput;
  39 class ResourcePool;
  40 }  // namespace movit
  41
  42 namespace movit {
  43 class YCbCrInput;
  44 }
  45 class QOpenGLContext;
  46 class QSurfaceFormat;
  47
  48 class Mixer {
  49 public:
  50         // The surface format is used for offscreen destinations for OpenGL contexts we need.
  51         Mixer(const QSurfaceFormat &format, unsigned num_cards);
  52         ~Mixer();
  53         void start();
  54         void quit();
  55
  56         void transition_clicked(int transition_num);
  57         void channel_clicked(int preview_num);
  58
  59         enum Output {
  60                 OUTPUT_LIVE = 0,
  61                 OUTPUT_PREVIEW,
  62                 OUTPUT_INPUT0,
  63                 OUTPUT_INPUT1,
  64                 OUTPUT_INPUT2,
  65                 OUTPUT_INPUT3,
  66                 NUM_OUTPUTS
  67         };
  68
  69         struct DisplayFrame {
  70                 // The chain for rendering this frame. To render a display frame,
  71                 // first wait for <ready_fence>, then call <setup_chain>
  72                 // to wire up all the inputs, and then finally call
  73                 // chain->render_to_screen() or similar.
  74                 movit::EffectChain *chain;
  75                 std::function<void()> setup_chain;
  76
  77                 // Asserted when all the inputs are ready; you cannot render the chain
  78                 // before this.
  79                 RefCountedGLsync ready_fence;
  80
  81                 // Holds on to all the input frames needed for this display frame,
  82                 // so they are not released while still rendering.
  83                 std::vector<RefCountedFrame> input_frames;
  84
  85                 // Textures that should be released back to the resource pool
  86                 // when this frame disappears, if any.
  87                 // TODO: Refcount these as well?
  88                 std::vector<GLuint> temp_textures;
  89         };
  90         // Implicitly frees the previous one if there's a new frame available.
  91         bool get_display_frame(Output output, DisplayFrame *frame) {
  92                 return output_channel[output].get_display_frame(frame);
  93         }
  94
  95         typedef std::function<void()> new_frame_ready_callback_t;
  96         void set_frame_ready_callback(Output output, new_frame_ready_callback_t callback)
  97         {
  98                 output_channel[output].set_frame_ready_callback(callback);
  99         }
 100
 101         typedef std::function<void(float, float, float, float, float)> audio_level_callback_t;
 102         void set_audio_level_callback(audio_level_callback_t callback)
 103         {
 104                 audio_level_callback = callback;
 105         }
 106
 107         std::vector<std::string> get_transition_names()
 108         {
 109                 return theme->get_transition_names(pts());
 110         }
 111
 112         unsigned get_num_channels() const
 113         {
 114                 return theme->get_num_channels();
 115         }
 116
 117 private:
 118         void bm_frame(unsigned card_index, uint16_t timecode,
 119                 FrameAllocator::Frame video_frame, size_t video_offset, uint16_t video_format,
 120                 FrameAllocator::Frame audio_frame, size_t audio_offset, uint16_t audio_format);
 121         void place_rectangle(movit::Effect *resample_effect, movit::Effect *padding_effect, float x0, float y0, float x1, float y1);
 122         void thread_func();
 123         void subsample_chroma(GLuint src_tex, GLuint dst_dst);
 124         void release_display_frame(DisplayFrame *frame);
 125         double pts() { return double(pts_int) / TIMEBASE; }
 126
 127         HTTPD httpd;
 128         unsigned num_cards;
 129
 130         QSurface *mixer_surface, *h264_encoder_surface;
 131         std::unique_ptr<movit::ResourcePool> resource_pool;
 132         std::unique_ptr<Theme> theme;
 133         std::unique_ptr<movit::EffectChain> display_chain;
 134         GLuint cbcr_program_num;  // Owned by <resource_pool>.
 135         std::unique_ptr<H264Encoder> h264_encoder;
 136
 137         // Effects part of <display_chain>. Owned by <display_chain>.
 138         movit::FlatInput *display_input;
 139
 140         int64_t pts_int = 0;  // In TIMEBASE units.
 141
 142         std::mutex bmusb_mutex;
 143         struct CaptureCard {
 144                 BMUSBCapture *usb;
 145                 std::unique_ptr<PBOFrameAllocator> frame_allocator;
 146
 147                 // Stuff for the OpenGL context (for texture uploading).
 148                 QSurface *surface;
 149                 QOpenGLContext *context;
 150
 151                 bool new_data_ready = false;  // Whether new_frame and new_frame_audio contains anything.
 152                 bool should_quit = false;
 153                 RefCountedFrame new_frame;
 154                 GLsync new_data_ready_fence;  // Whether new_frame is ready for rendering.
 155                 std::vector<float> new_frame_audio;
 156                 std::condition_variable new_data_ready_changed;  // Set whenever new_data_ready is changed.
 157                 unsigned dropped_frames = 0;  // Before new_frame.
 158
 159                 std::mutex audio_mutex;
 160                 std::unique_ptr<Resampler> resampler;  // Under audio_mutex.
 161                 int last_timecode = -1;  // Unwrapped.
 162         };
 163         CaptureCard cards[MAX_CARDS];  // protected by <bmusb_mutex>
 164
 165         RefCountedFrame bmusb_current_rendering_frame[MAX_CARDS];
 166
 167         class OutputChannel {
 168         public:
 169                 ~OutputChannel();
 170                 void output_frame(DisplayFrame frame);
 171                 bool get_display_frame(DisplayFrame *frame);
 172                 void set_frame_ready_callback(new_frame_ready_callback_t callback);
 173
 174         private:
 175                 friend class Mixer;
 176
 177                 Mixer *parent = nullptr;  // Not owned.
 178                 std::mutex frame_mutex;
 179                 DisplayFrame current_frame, ready_frame;  // protected by <frame_mutex>
 180                 bool has_current_frame = false, has_ready_frame = false;  // protected by <frame_mutex>
 181                 new_frame_ready_callback_t new_frame_ready_callback;
 182                 bool has_new_frame_ready_callback = false;
 183         };
 184         OutputChannel output_channel[NUM_OUTPUTS];
 185
 186         std::thread mixer_thread;
 187         bool should_quit = false;
 188
 189         audio_level_callback_t audio_level_callback = nullptr;
 190         Ebu_r128_proc r128;
 191
 192         // TODO: Implement oversampled peak detection.
 193         float peak = 0.0f;
 194 };
 195
 196 extern Mixer *global_mixer;
 197
 198 #endif  // !defined(_MIXER_H)