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 <zita-resampler/resampler.h>
  14 #include <atomic>
  15 #include <condition_variable>
  16 #include <cstddef>
  17 #include <functional>
  18 #include <memory>
  19 #include <mutex>
  20 #include <string>
  21 #include <thread>
  22 #include <vector>
  23
  24 #include "bmusb/bmusb.h"
  25 #include "alsa_output.h"
  26 #include "ebu_r128_proc.h"
  27 #include "h264encode.h"
  28 #include "httpd.h"
  29 #include "pbo_frame_allocator.h"
  30 #include "ref_counted_frame.h"
  31 #include "ref_counted_gl_sync.h"
  32 #include "resampling_queue.h"
  33 #include "theme.h"
  34 #include "timebase.h"
  35 #include "stereocompressor.h"
  36 #include "filter.h"
  37 #include "input_state.h"
  38 #include "correlation_measurer.h"
  39
  40 class H264Encoder;
  41 class QSurface;
  42 namespace movit {
  43 class Effect;
  44 class EffectChain;
  45 class FlatInput;
  46 class ResourcePool;
  47 }  // namespace movit
  48
  49 namespace movit {
  50 class YCbCrInput;
  51 }
  52 class QOpenGLContext;
  53 class QSurfaceFormat;
  54
  55 class Mixer {
  56 public:
  57         // The surface format is used for offscreen destinations for OpenGL contexts we need.
  58         Mixer(const QSurfaceFormat &format, unsigned num_cards);
  59         ~Mixer();
  60         void start();
  61         void quit();
  62
  63         void transition_clicked(int transition_num);
  64         void channel_clicked(int preview_num);
  65
  66         enum Output {
  67                 OUTPUT_LIVE = 0,
  68                 OUTPUT_PREVIEW,
  69                 OUTPUT_INPUT0,  // 1, 2, 3, up to 15 follow numerically.
  70                 NUM_OUTPUTS = 18
  71         };
  72
  73         struct DisplayFrame {
  74                 // The chain for rendering this frame. To render a display frame,
  75                 // first wait for <ready_fence>, then call <setup_chain>
  76                 // to wire up all the inputs, and then finally call
  77                 // chain->render_to_screen() or similar.
  78                 movit::EffectChain *chain;
  79                 std::function<void()> setup_chain;
  80
  81                 // Asserted when all the inputs are ready; you cannot render the chain
  82                 // before this.
  83                 RefCountedGLsync ready_fence;
  84
  85                 // Holds on to all the input frames needed for this display frame,
  86                 // so they are not released while still rendering.
  87                 std::vector<RefCountedFrame> input_frames;
  88
  89                 // Textures that should be released back to the resource pool
  90                 // when this frame disappears, if any.
  91                 // TODO: Refcount these as well?
  92                 std::vector<GLuint> temp_textures;
  93         };
  94         // Implicitly frees the previous one if there's a new frame available.
  95         bool get_display_frame(Output output, DisplayFrame *frame) {
  96                 return output_channel[output].get_display_frame(frame);
  97         }
  98
  99         typedef std::function<void()> new_frame_ready_callback_t;
 100         void set_frame_ready_callback(Output output, new_frame_ready_callback_t callback)
 101         {
 102                 output_channel[output].set_frame_ready_callback(callback);
 103         }
 104
 105         typedef std::function<void(float level_lufs, float peak_db,
 106                                    float global_level_lufs, float range_low_lufs, float range_high_lufs,
 107                                    float gain_staging_db, float final_makeup_gain_db,
 108                                    float correlation)> audio_level_callback_t;
 109         void set_audio_level_callback(audio_level_callback_t callback)
 110         {
 111                 audio_level_callback = callback;
 112         }
 113
 114         std::vector<std::string> get_transition_names()
 115         {
 116                 return theme->get_transition_names(pts());
 117         }
 118
 119         unsigned get_num_channels() const
 120         {
 121                 return theme->get_num_channels();
 122         }
 123
 124         std::string get_channel_name(unsigned channel) const
 125         {
 126                 return theme->get_channel_name(channel);
 127         }
 128
 129         int get_channel_signal(unsigned channel) const
 130         {
 131                 return theme->get_channel_signal(channel);
 132         }
 133
 134         int map_signal(unsigned channel)
 135         {
 136                 return theme->map_signal(channel);
 137         }
 138
 139         void set_signal_mapping(int signal, int card)
 140         {
 141                 return theme->set_signal_mapping(signal, card);
 142         }
 143
 144         bool get_supports_set_wb(unsigned channel) const
 145         {
 146                 return theme->get_supports_set_wb(channel);
 147         }
 148
 149         void set_wb(unsigned channel, double r, double g, double b) const
 150         {
 151                 theme->set_wb(channel, r, g, b);
 152         }
 153
 154         void set_locut_cutoff(float cutoff_hz)
 155         {
 156                 locut_cutoff_hz = cutoff_hz;
 157         }
 158
 159         void set_locut_enabled(bool enabled)
 160         {
 161                 locut_enabled = enabled;
 162         }
 163
 164         float get_limiter_threshold_dbfs()
 165         {
 166                 return limiter_threshold_dbfs;
 167         }
 168
 169         float get_compressor_threshold_dbfs()
 170         {
 171                 return compressor_threshold_dbfs;
 172         }
 173
 174         void set_limiter_threshold_dbfs(float threshold_dbfs)
 175         {
 176                 limiter_threshold_dbfs = threshold_dbfs;
 177         }
 178
 179         void set_compressor_threshold_dbfs(float threshold_dbfs)
 180         {
 181                 compressor_threshold_dbfs = threshold_dbfs;
 182         }
 183
 184         void set_limiter_enabled(bool enabled)
 185         {
 186                 limiter_enabled = enabled;
 187         }
 188
 189         void set_compressor_enabled(bool enabled)
 190         {
 191                 compressor_enabled = enabled;
 192         }
 193
 194         void set_gain_staging_db(float gain_db)
 195         {
 196                 std::unique_lock<std::mutex> lock(compressor_mutex);
 197                 level_compressor_enabled = false;
 198                 gain_staging_db = gain_db;
 199         }
 200
 201         void set_gain_staging_auto(bool enabled)
 202         {
 203                 std::unique_lock<std::mutex> lock(compressor_mutex);
 204                 level_compressor_enabled = enabled;
 205         }
 206
 207         void set_final_makeup_gain_db(float gain_db)
 208         {
 209                 std::unique_lock<std::mutex> lock(compressor_mutex);
 210                 final_makeup_gain_auto = false;
 211                 final_makeup_gain = pow(10.0f, gain_db / 20.0f);
 212         }
 213
 214         void set_final_makeup_gain_auto(bool enabled)
 215         {
 216                 std::unique_lock<std::mutex> lock(compressor_mutex);
 217                 final_makeup_gain_auto = enabled;
 218         }
 219
 220         void schedule_cut()
 221         {
 222                 should_cut = true;
 223         }
 224
 225         void reset_meters();
 226
 227         unsigned get_num_cards() const { return num_cards; }
 228
 229         std::string get_card_description(unsigned card_index) const {
 230                 assert(card_index < num_cards);
 231                 return cards[card_index].usb->get_description();
 232         }
 233
 234 private:
 235         void bm_frame(unsigned card_index, uint16_t timecode,
 236                 FrameAllocator::Frame video_frame, size_t video_offset, uint16_t video_format,
 237                 FrameAllocator::Frame audio_frame, size_t audio_offset, uint16_t audio_format);
 238         void place_rectangle(movit::Effect *resample_effect, movit::Effect *padding_effect, float x0, float y0, float x1, float y1);
 239         void thread_func();
 240         void audio_thread_func();
 241         void process_audio_one_frame(int64_t frame_pts_int, int num_samples);
 242         void subsample_chroma(GLuint src_tex, GLuint dst_dst);
 243         void release_display_frame(DisplayFrame *frame);
 244         double pts() { return double(pts_int) / TIMEBASE; }
 245
 246         HTTPD httpd;
 247         unsigned num_cards;
 248
 249         QSurface *mixer_surface, *h264_encoder_surface;
 250         std::unique_ptr<movit::ResourcePool> resource_pool;
 251         std::unique_ptr<Theme> theme;
 252         std::unique_ptr<movit::EffectChain> display_chain;
 253         GLuint cbcr_program_num;  // Owned by <resource_pool>.
 254         std::unique_ptr<H264Encoder> h264_encoder;
 255
 256         // Effects part of <display_chain>. Owned by <display_chain>.
 257         movit::FlatInput *display_input;
 258
 259         int64_t pts_int = 0;  // In TIMEBASE units.
 260
 261         std::mutex bmusb_mutex;
 262         struct CaptureCard {
 263                 BMUSBCapture *usb;
 264                 std::unique_ptr<PBOFrameAllocator> frame_allocator;
 265
 266                 // Stuff for the OpenGL context (for texture uploading).
 267                 QSurface *surface;
 268                 QOpenGLContext *context;
 269
 270                 bool new_data_ready = false;  // Whether new_frame contains anything.
 271                 bool should_quit = false;
 272                 RefCountedFrame new_frame;
 273                 int64_t new_frame_length;  // In TIMEBASE units.
 274                 bool new_frame_interlaced;
 275                 unsigned new_frame_field;  // Which field (0 or 1) of the frame to use. Always 0 for progressive.
 276                 GLsync new_data_ready_fence;  // Whether new_frame is ready for rendering.
 277                 std::condition_variable new_data_ready_changed;  // Set whenever new_data_ready is changed.
 278                 unsigned dropped_frames = 0;  // Before new_frame.
 279
 280                 // Accumulated errors in number of 1/TIMEBASE samples. If OUTPUT_FREQUENCY divided by
 281                 // frame rate is integer, will always stay zero.
 282                 unsigned fractional_samples = 0;
 283
 284                 std::mutex audio_mutex;
 285                 std::unique_ptr<ResamplingQueue> resampling_queue;  // Under audio_mutex.
 286                 int last_timecode = -1;  // Unwrapped.
 287                 int64_t next_local_pts = 0;  // Beginning of next frame, in TIMEBASE units.
 288         };
 289         CaptureCard cards[MAX_CARDS];  // protected by <bmusb_mutex>
 290
 291         InputState input_state;
 292
 293         class OutputChannel {
 294         public:
 295                 ~OutputChannel();
 296                 void output_frame(DisplayFrame frame);
 297                 bool get_display_frame(DisplayFrame *frame);
 298                 void set_frame_ready_callback(new_frame_ready_callback_t callback);
 299
 300         private:
 301                 friend class Mixer;
 302
 303                 Mixer *parent = nullptr;  // Not owned.
 304                 std::mutex frame_mutex;
 305                 DisplayFrame current_frame, ready_frame;  // protected by <frame_mutex>
 306                 bool has_current_frame = false, has_ready_frame = false;  // protected by <frame_mutex>
 307                 new_frame_ready_callback_t new_frame_ready_callback;
 308                 bool has_new_frame_ready_callback = false;
 309         };
 310         OutputChannel output_channel[NUM_OUTPUTS];
 311
 312         std::thread mixer_thread;
 313         std::thread audio_thread;
 314         std::atomic<bool> should_quit{false};
 315         std::atomic<bool> should_cut{false};
 316
 317         audio_level_callback_t audio_level_callback = nullptr;
 318         std::mutex compressor_mutex;
 319         Ebu_r128_proc r128;  // Under compressor_mutex.
 320         CorrelationMeasurer correlation;  // Under compressor_mutex.
 321
 322         Resampler peak_resampler;
 323         std::atomic<float> peak{0.0f};
 324
 325         StereoFilter locut;  // Default cutoff 120 Hz, 24 dB/oct.
 326         std::atomic<float> locut_cutoff_hz;
 327         std::atomic<bool> locut_enabled{true};
 328
 329         // First compressor; takes us up to about -12 dBFS.
 330         StereoCompressor level_compressor;  // Under compressor_mutex. Used to set/override gain_staging_db if <level_compressor_enabled>.
 331         float gain_staging_db = 0.0f;  // Under compressor_mutex.
 332         bool level_compressor_enabled = true;  // Under compressor_mutex.
 333
 334         static constexpr float ref_level_dbfs = -14.0f;  // Chosen so that we end up around 0 LU in practice.
 335         static constexpr float ref_level_lufs = -23.0f;  // 0 LU, more or less by definition.
 336
 337         StereoCompressor limiter;
 338         std::atomic<float> limiter_threshold_dbfs{ref_level_dbfs + 4.0f};   // 4 dB.
 339         std::atomic<bool> limiter_enabled{true};
 340         StereoCompressor compressor;
 341         std::atomic<float> compressor_threshold_dbfs{ref_level_dbfs - 12.0f};  // -12 dB.
 342         std::atomic<bool> compressor_enabled{true};
 343
 344         double final_makeup_gain = 1.0;  // Under compressor_mutex. Read/write by the user. Note: Not in dB, we want the numeric precision so that we can change it slowly.
 345         bool final_makeup_gain_auto = true;  // Under compressor_mutex.
 346
 347         std::unique_ptr<ALSAOutput> alsa;
 348
 349         struct AudioTask {
 350                 int64_t pts_int;
 351                 int num_samples;
 352         };
 353         std::mutex audio_mutex;
 354         std::condition_variable audio_task_queue_changed;
 355         std::queue<AudioTask> audio_task_queue;  // Under audio_mutex.
 356 };
 357
 358 extern Mixer *global_mixer;
 359
 360 #endif  // !defined(_MIXER_H)