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 <atomic>
  14 #include <condition_variable>
  15 #include <cstddef>
  16 #include <functional>
  17 #include <memory>
  18 #include <mutex>
  19 #include <string>
  20 #include <thread>
  21 #include <vector>
  22
  23 #include "bmusb/bmusb.h"
  24 #include "ebu_r128_proc.h"
  25 #include "h264encode.h"
  26 #include "httpd.h"
  27 #include "pbo_frame_allocator.h"
  28 #include "ref_counted_frame.h"
  29 #include "ref_counted_gl_sync.h"
  30 #include "resampling_queue.h"
  31 #include "theme.h"
  32 #include "timebase.h"
  33 #include "stereocompressor.h"
  34 #include "filter.h"
  35
  36 class H264Encoder;
  37 class QSurface;
  38 namespace movit {
  39 class Effect;
  40 class EffectChain;
  41 class FlatInput;
  42 class ResourcePool;
  43 }  // namespace movit
  44
  45 namespace movit {
  46 class YCbCrInput;
  47 }
  48 class QOpenGLContext;
  49 class QSurfaceFormat;
  50
  51 class Mixer {
  52 public:
  53         // The surface format is used for offscreen destinations for OpenGL contexts we need.
  54         Mixer(const QSurfaceFormat &format, unsigned num_cards);
  55         ~Mixer();
  56         void start();
  57         void quit();
  58
  59         void transition_clicked(int transition_num);
  60         void channel_clicked(int preview_num);
  61
  62         enum Output {
  63                 OUTPUT_LIVE = 0,
  64                 OUTPUT_PREVIEW,
  65                 OUTPUT_INPUT0,  // 1, 2, 3, up to 15 follow numerically.
  66                 NUM_OUTPUTS = 18
  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 level_lufs, float peak_db,
 102                                    float global_level_lufs, float range_low_lufs, float range_high_lufs,
 103                                    float auto_gain_staging_db)> audio_level_callback_t;
 104         void set_audio_level_callback(audio_level_callback_t callback)
 105         {
 106                 audio_level_callback = callback;
 107         }
 108
 109         std::vector<std::string> get_transition_names()
 110         {
 111                 return theme->get_transition_names(pts());
 112         }
 113
 114         unsigned get_num_channels() const
 115         {
 116                 return theme->get_num_channels();
 117         }
 118
 119         std::string get_channel_name(unsigned channel) const
 120         {
 121                 return theme->get_channel_name(channel);
 122         }
 123
 124         bool get_supports_set_wb(unsigned channel) const
 125         {
 126                 return theme->get_supports_set_wb(channel);
 127         }
 128
 129         void set_wb(unsigned channel, double r, double g, double b) const
 130         {
 131                 theme->set_wb(channel, r, g, b);
 132         }
 133
 134         void set_locut_cutoff(float cutoff_hz)
 135         {
 136                 locut_cutoff_hz = cutoff_hz;
 137         }
 138
 139         void reset_meters();
 140
 141 private:
 142         void bm_frame(unsigned card_index, uint16_t timecode,
 143                 FrameAllocator::Frame video_frame, size_t video_offset, uint16_t video_format,
 144                 FrameAllocator::Frame audio_frame, size_t audio_offset, uint16_t audio_format);
 145         void place_rectangle(movit::Effect *resample_effect, movit::Effect *padding_effect, float x0, float y0, float x1, float y1);
 146         void thread_func();
 147         void process_audio_one_frame();
 148         void subsample_chroma(GLuint src_tex, GLuint dst_dst);
 149         void release_display_frame(DisplayFrame *frame);
 150         double pts() { return double(pts_int) / TIMEBASE; }
 151
 152         HTTPD httpd;
 153         unsigned num_cards;
 154
 155         QSurface *mixer_surface, *h264_encoder_surface;
 156         std::unique_ptr<movit::ResourcePool> resource_pool;
 157         std::unique_ptr<Theme> theme;
 158         std::unique_ptr<movit::EffectChain> display_chain;
 159         GLuint cbcr_program_num;  // Owned by <resource_pool>.
 160         std::unique_ptr<H264Encoder> h264_encoder;
 161
 162         // Effects part of <display_chain>. Owned by <display_chain>.
 163         movit::FlatInput *display_input;
 164
 165         int64_t pts_int = 0;  // In TIMEBASE units.
 166
 167         std::mutex bmusb_mutex;
 168         struct CaptureCard {
 169                 BMUSBCapture *usb;
 170                 std::unique_ptr<PBOFrameAllocator> frame_allocator;
 171
 172                 // Stuff for the OpenGL context (for texture uploading).
 173                 QSurface *surface;
 174                 QOpenGLContext *context;
 175
 176                 bool new_data_ready = false;  // Whether new_frame contains anything.
 177                 bool should_quit = false;
 178                 RefCountedFrame new_frame;
 179                 GLsync new_data_ready_fence;  // Whether new_frame is ready for rendering.
 180                 std::condition_variable new_data_ready_changed;  // Set whenever new_data_ready is changed.
 181                 unsigned dropped_frames = 0;  // Before new_frame.
 182
 183                 std::mutex audio_mutex;
 184                 std::unique_ptr<ResamplingQueue> resampling_queue;  // Under audio_mutex.
 185                 int last_timecode = -1;  // Unwrapped.
 186         };
 187         CaptureCard cards[MAX_CARDS];  // protected by <bmusb_mutex>
 188
 189         RefCountedFrame bmusb_current_rendering_frame[MAX_CARDS];
 190
 191         class OutputChannel {
 192         public:
 193                 ~OutputChannel();
 194                 void output_frame(DisplayFrame frame);
 195                 bool get_display_frame(DisplayFrame *frame);
 196                 void set_frame_ready_callback(new_frame_ready_callback_t callback);
 197
 198         private:
 199                 friend class Mixer;
 200
 201                 Mixer *parent = nullptr;  // Not owned.
 202                 std::mutex frame_mutex;
 203                 DisplayFrame current_frame, ready_frame;  // protected by <frame_mutex>
 204                 bool has_current_frame = false, has_ready_frame = false;  // protected by <frame_mutex>
 205                 new_frame_ready_callback_t new_frame_ready_callback;
 206                 bool has_new_frame_ready_callback = false;
 207         };
 208         OutputChannel output_channel[NUM_OUTPUTS];
 209
 210         std::thread mixer_thread;
 211         bool should_quit = false;
 212
 213         audio_level_callback_t audio_level_callback = nullptr;
 214         Ebu_r128_proc r128;
 215
 216         // TODO: Implement oversampled peak detection.
 217         std::atomic<float> peak{0.0f};
 218
 219         StereoFilter locut;  // Default cutoff 150 Hz, 24 dB/oct.
 220         std::atomic<float> locut_cutoff_hz;
 221
 222         // First compressor; takes us up to about -12 dBFS.
 223         StereoCompressor level_compressor;
 224         float last_gain_staging_db = 0.0f;
 225
 226         StereoCompressor limiter;
 227         StereoCompressor compressor;
 228 };
 229
 230 extern Mixer *global_mixer;
 231
 232 #endif  // !defined(_MIXER_H)