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 #include "stereocompressor.h"
  33 #include "filter.h"
  34
  35 class H264Encoder;
  36 class QSurface;
  37 namespace movit {
  38 class Effect;
  39 class EffectChain;
  40 class FlatInput;
  41 class ResourcePool;
  42 }  // namespace movit
  43
  44 namespace movit {
  45 class YCbCrInput;
  46 }
  47 class QOpenGLContext;
  48 class QSurfaceFormat;
  49
  50 class Mixer {
  51 public:
  52         // The surface format is used for offscreen destinations for OpenGL contexts we need.
  53         Mixer(const QSurfaceFormat &format, unsigned num_cards);
  54         ~Mixer();
  55         void start();
  56         void quit();
  57
  58         void transition_clicked(int transition_num);
  59         void channel_clicked(int preview_num);
  60
  61         enum Output {
  62                 OUTPUT_LIVE = 0,
  63                 OUTPUT_PREVIEW,
  64                 OUTPUT_INPUT0,  // 1, 2, 3, up to 15 follow numerically.
  65                 NUM_OUTPUTS = 18
  66         };
  67
  68         struct DisplayFrame {
  69                 // The chain for rendering this frame. To render a display frame,
  70                 // first wait for <ready_fence>, then call <setup_chain>
  71                 // to wire up all the inputs, and then finally call
  72                 // chain->render_to_screen() or similar.
  73                 movit::EffectChain *chain;
  74                 std::function<void()> setup_chain;
  75
  76                 // Asserted when all the inputs are ready; you cannot render the chain
  77                 // before this.
  78                 RefCountedGLsync ready_fence;
  79
  80                 // Holds on to all the input frames needed for this display frame,
  81                 // so they are not released while still rendering.
  82                 std::vector<RefCountedFrame> input_frames;
  83
  84                 // Textures that should be released back to the resource pool
  85                 // when this frame disappears, if any.
  86                 // TODO: Refcount these as well?
  87                 std::vector<GLuint> temp_textures;
  88         };
  89         // Implicitly frees the previous one if there's a new frame available.
  90         bool get_display_frame(Output output, DisplayFrame *frame) {
  91                 return output_channel[output].get_display_frame(frame);
  92         }
  93
  94         typedef std::function<void()> new_frame_ready_callback_t;
  95         void set_frame_ready_callback(Output output, new_frame_ready_callback_t callback)
  96         {
  97                 output_channel[output].set_frame_ready_callback(callback);
  98         }
  99
 100         typedef std::function<void(float level_lufs, float peak_db,
 101                                    float global_level_lufs, float range_low_lufs, float range_high_lufs,
 102                                    float auto_gain_staging_db)> audio_level_callback_t;
 103         void set_audio_level_callback(audio_level_callback_t callback)
 104         {
 105                 audio_level_callback = callback;
 106         }
 107
 108         std::vector<std::string> get_transition_names()
 109         {
 110                 return theme->get_transition_names(pts());
 111         }
 112
 113         unsigned get_num_channels() const
 114         {
 115                 return theme->get_num_channels();
 116         }
 117
 118         std::string get_channel_name(unsigned channel) const
 119         {
 120                 return theme->get_channel_name(channel);
 121         }
 122
 123         bool get_supports_set_wb(unsigned channel) const
 124         {
 125                 return theme->get_supports_set_wb(channel);
 126         }
 127
 128         void set_wb(unsigned channel, double r, double g, double b) const
 129         {
 130                 theme->set_wb(channel, r, g, b);
 131         }
 132
 133 private:
 134         void bm_frame(unsigned card_index, uint16_t timecode,
 135                 FrameAllocator::Frame video_frame, size_t video_offset, uint16_t video_format,
 136                 FrameAllocator::Frame audio_frame, size_t audio_offset, uint16_t audio_format);
 137         void place_rectangle(movit::Effect *resample_effect, movit::Effect *padding_effect, float x0, float y0, float x1, float y1);
 138         void thread_func();
 139         void process_audio_one_frame();
 140         void subsample_chroma(GLuint src_tex, GLuint dst_dst);
 141         void release_display_frame(DisplayFrame *frame);
 142         double pts() { return double(pts_int) / TIMEBASE; }
 143
 144         HTTPD httpd;
 145         unsigned num_cards;
 146
 147         QSurface *mixer_surface, *h264_encoder_surface;
 148         std::unique_ptr<movit::ResourcePool> resource_pool;
 149         std::unique_ptr<Theme> theme;
 150         std::unique_ptr<movit::EffectChain> display_chain;
 151         GLuint cbcr_program_num;  // Owned by <resource_pool>.
 152         std::unique_ptr<H264Encoder> h264_encoder;
 153
 154         // Effects part of <display_chain>. Owned by <display_chain>.
 155         movit::FlatInput *display_input;
 156
 157         int64_t pts_int = 0;  // In TIMEBASE units.
 158
 159         std::mutex bmusb_mutex;
 160         struct CaptureCard {
 161                 BMUSBCapture *usb;
 162                 std::unique_ptr<PBOFrameAllocator> frame_allocator;
 163
 164                 // Stuff for the OpenGL context (for texture uploading).
 165                 QSurface *surface;
 166                 QOpenGLContext *context;
 167
 168                 bool new_data_ready = false;  // Whether new_frame contains anything.
 169                 bool should_quit = false;
 170                 RefCountedFrame new_frame;
 171                 GLsync new_data_ready_fence;  // Whether new_frame is ready for rendering.
 172                 std::condition_variable new_data_ready_changed;  // Set whenever new_data_ready is changed.
 173                 unsigned dropped_frames = 0;  // Before new_frame.
 174
 175                 std::mutex audio_mutex;
 176                 std::unique_ptr<Resampler> resampler;  // Under audio_mutex.
 177                 int last_timecode = -1;  // Unwrapped.
 178         };
 179         CaptureCard cards[MAX_CARDS];  // protected by <bmusb_mutex>
 180
 181         RefCountedFrame bmusb_current_rendering_frame[MAX_CARDS];
 182
 183         class OutputChannel {
 184         public:
 185                 ~OutputChannel();
 186                 void output_frame(DisplayFrame frame);
 187                 bool get_display_frame(DisplayFrame *frame);
 188                 void set_frame_ready_callback(new_frame_ready_callback_t callback);
 189
 190         private:
 191                 friend class Mixer;
 192
 193                 Mixer *parent = nullptr;  // Not owned.
 194                 std::mutex frame_mutex;
 195                 DisplayFrame current_frame, ready_frame;  // protected by <frame_mutex>
 196                 bool has_current_frame = false, has_ready_frame = false;  // protected by <frame_mutex>
 197                 new_frame_ready_callback_t new_frame_ready_callback;
 198                 bool has_new_frame_ready_callback = false;
 199         };
 200         OutputChannel output_channel[NUM_OUTPUTS];
 201
 202         std::thread mixer_thread;
 203         bool should_quit = false;
 204
 205         audio_level_callback_t audio_level_callback = nullptr;
 206         Ebu_r128_proc r128;
 207
 208         // TODO: Implement oversampled peak detection.
 209         float peak = 0.0f;
 210
 211         StereoFilter locut;  // Cutoff 150 Hz, 24 dB/oct.
 212
 213         // First compressor; takes us up to about -12 dBFS.
 214         StereoCompressor level_compressor;
 215         float last_gain_staging_db = 0.0f;
 216 };
 217
 218 extern Mixer *global_mixer;
 219
 220 #endif  // !defined(_MIXER_H)