4 // The actual video mixer, running in its own separate background thread.
15 #include <condition_variable>
26 #include <movit/effect.h>
27 #include <movit/image_format.h>
29 #include "audio_mixer.h"
30 #include "bmusb/bmusb.h"
32 #include "ffmpeg_capture.h"
33 #include "shared/httpd.h"
34 #include "input_state.h"
36 #include "pbo_frame_allocator.h"
37 #include "ref_counted_frame.h"
38 #include "shared/ref_counted_gl_sync.h"
40 #include "shared/timebase.h"
41 #include "video_encoder.h"
42 #include "ycbcr_interpretation.h"
45 class ChromaSubsampler;
50 class TimecodeRenderer;
60 // A class to estimate the future jitter. Used in QueueLengthPolicy (see below).
62 // There are many ways to estimate jitter; I've tested a few ones (and also
63 // some algorithms that don't explicitly model jitter) with different
64 // parameters on some real-life data in experiments/queue_drop_policy.cpp.
65 // This is one based on simple order statistics where I've added some margin in
66 // the number of starvation events; I believe that about one every hour would
67 // probably be acceptable, but this one typically goes lower than that, at the
68 // cost of 2–3 ms extra latency. (If the queue is hard-limited to one frame, it's
69 // possible to get ~10 ms further down, but this would mean framedrops every
70 // second or so.) The general strategy is: Take the 99.9-percentile jitter over
71 // last 5000 frames, multiply by two, and that's our worst-case jitter
72 // estimate. The fact that we're not using the max value means that we could
73 // actually even throw away very late frames immediately, which means we only
74 // get one user-visible event instead of seeing something both when the frame
75 // arrives late (duplicate frame) and then again when we drop.
78 static constexpr size_t history_length = 5000;
79 static constexpr double percentile = 0.999;
80 static constexpr double multiplier = 2.0;
83 void register_metrics(const std::vector<std::pair<std::string, std::string>> &labels);
84 void unregister_metrics(const std::vector<std::pair<std::string, std::string>> &labels);
90 void frame_arrived(std::chrono::steady_clock::time_point now, int64_t frame_duration, size_t dropped_frames);
91 std::chrono::steady_clock::time_point get_expected_next_frame() const { return expected_timestamp; }
92 double estimate_max_jitter() const;
95 // A simple O(k) based algorithm for getting the k-th largest or
96 // smallest element from our window; we simply keep the multiset
97 // ordered (insertions and deletions are O(n) as always) and then
98 // iterate from one of the sides. If we had larger values of k,
99 // we could go for a more complicated setup with two sets or heaps
100 // (one increasing and one decreasing) that we keep balanced around
101 // the point, or it is possible to reimplement std::set with
102 // counts in each node. However, since k=5, we don't need this.
103 std::multiset<double> orders;
104 std::deque<std::multiset<double>::iterator> history;
106 std::chrono::steady_clock::time_point expected_timestamp = std::chrono::steady_clock::time_point::min();
108 // Metrics. There are no direct summaries for jitter, since we already have latency summaries.
109 std::atomic<int64_t> metric_input_underestimated_jitter_frames{0};
110 std::atomic<double> metric_input_estimated_max_jitter_seconds{0.0 / 0.0};
113 // For any card that's not the master (where we pick out the frames as they
114 // come, as fast as we can process), there's going to be a queue. The question
115 // is when we should drop frames from that queue (apart from the obvious
116 // dropping if the 16-frame queue should become full), especially given that
117 // the frame rate could be lower or higher than the master (either subtly or
118 // dramatically). We have two (conflicting) demands:
120 // 1. We want to avoid starving the queue.
121 // 2. We don't want to add more delay than is needed.
123 // Our general strategy is to drop as many frames as we can (helping for #2)
124 // that we think is safe for #1 given jitter. To this end, we measure the
125 // deviation from the expected arrival time for all cards, and use that for
126 // continuous jitter estimation.
128 // We then drop everything from the queue that we're sure we won't need to
129 // serve the output in the time before the next frame arrives. Typically,
130 // this means the queue will contain 0 or 1 frames, although more is also
131 // possible if the jitter is very high.
132 class QueueLengthPolicy {
134 QueueLengthPolicy() {}
136 void register_metrics(const std::vector<std::pair<std::string, std::string>> &labels);
137 void unregister_metrics(const std::vector<std::pair<std::string, std::string>> &labels);
139 // Call after picking out a frame, so 0 means starvation.
140 // Note that the policy has no memory; everything is given in as parameters.
141 void update_policy(std::chrono::steady_clock::time_point now,
142 std::chrono::steady_clock::time_point expected_next_frame,
143 int64_t input_frame_duration,
144 int64_t master_frame_duration,
145 double max_input_card_jitter_seconds,
146 double max_master_card_jitter_seconds);
147 unsigned get_safe_queue_length() const { return safe_queue_length; }
150 unsigned safe_queue_length = 0; // Can never go below zero.
153 std::atomic<int64_t> metric_input_queue_safe_length_frames{1};
158 // The surface format is used for offscreen destinations for OpenGL contexts we need.
159 Mixer(const QSurfaceFormat &format);
164 void transition_clicked(int transition_num);
165 void channel_clicked(int preview_num);
170 OUTPUT_INPUT0, // 1, 2, 3, up to 15 follow numerically.
174 struct DisplayFrame {
175 // The chain for rendering this frame. To render a display frame,
176 // first wait for <ready_fence>, then call <setup_chain>
177 // to wire up all the inputs, and then finally call
178 // chain->render_to_screen() or similar.
179 movit::EffectChain *chain;
180 std::function<void()> setup_chain;
182 // Asserted when all the inputs are ready; you cannot render the chain
184 RefCountedGLsync ready_fence;
186 // Holds on to all the input frames needed for this display frame,
187 // so they are not released while still rendering.
188 std::vector<RefCountedFrame> input_frames;
190 // Textures that should be released back to the resource pool
191 // when this frame disappears, if any.
192 // TODO: Refcount these as well?
193 std::vector<GLuint> temp_textures;
195 // Implicitly frees the previous one if there's a new frame available.
196 bool get_display_frame(Output output, DisplayFrame *frame) {
197 return output_channel[output].get_display_frame(frame);
200 // NOTE: Callbacks will be called with a mutex held, so you should probably
201 // not do real work in them.
202 typedef std::function<void()> new_frame_ready_callback_t;
203 void add_frame_ready_callback(Output output, void *key, new_frame_ready_callback_t callback)
205 output_channel[output].add_frame_ready_callback(key, callback);
208 void remove_frame_ready_callback(Output output, void *key)
210 output_channel[output].remove_frame_ready_callback(key);
213 // TODO: Should this really be per-channel? Shouldn't it just be called for e.g. the live output?
214 typedef std::function<void(const std::vector<std::string> &)> transition_names_updated_callback_t;
215 void set_transition_names_updated_callback(Output output, transition_names_updated_callback_t callback)
217 output_channel[output].set_transition_names_updated_callback(callback);
220 typedef std::function<void(const std::string &)> name_updated_callback_t;
221 void set_name_updated_callback(Output output, name_updated_callback_t callback)
223 output_channel[output].set_name_updated_callback(callback);
226 typedef std::function<void(const std::string &)> color_updated_callback_t;
227 void set_color_updated_callback(Output output, color_updated_callback_t callback)
229 output_channel[output].set_color_updated_callback(callback);
232 std::vector<std::string> get_transition_names()
234 return theme->get_transition_names(pts());
237 unsigned get_num_channels() const
239 return theme->get_num_channels();
242 std::string get_channel_name(unsigned channel) const
244 return theme->get_channel_name(channel);
247 std::string get_channel_color(unsigned channel) const
249 return theme->get_channel_color(channel);
252 int map_channel_to_signal(unsigned channel) const
254 return theme->map_channel_to_signal(channel);
257 int map_signal_to_card(int signal)
259 return theme->map_signal_to_card(signal);
262 unsigned get_master_clock() const
264 return master_clock_channel;
267 void set_master_clock(unsigned channel)
269 master_clock_channel = channel;
272 void set_signal_mapping(int signal, int card)
274 return theme->set_signal_mapping(signal, card);
277 YCbCrInterpretation get_input_ycbcr_interpretation(unsigned card_index) const;
278 void set_input_ycbcr_interpretation(unsigned card_index, const YCbCrInterpretation &interpretation);
280 bool get_supports_set_wb(unsigned channel) const
282 return theme->get_supports_set_wb(channel);
285 void set_wb(unsigned channel, double r, double g, double b) const
287 theme->set_wb(channel, r, g, b);
290 std::string format_status_line(const std::string &disk_space_left_text, double file_length_seconds)
292 return theme->format_status_line(disk_space_left_text, file_length_seconds);
295 // Note: You can also get this through the global variable global_audio_mixer.
296 AudioMixer *get_audio_mixer() { return audio_mixer.get(); }
297 const AudioMixer *get_audio_mixer() const { return audio_mixer.get(); }
304 std::string get_card_description(unsigned card_index) const {
305 assert(card_index < MAX_VIDEO_CARDS);
306 return cards[card_index].capture->get_description();
309 // The difference between this and the previous function is that if a card
310 // is used as the current output, get_card_description() will return the
311 // fake card that's replacing it for input, whereas this function will return
312 // the card's actual name.
313 std::string get_output_card_description(unsigned card_index) const {
314 assert(card_can_be_used_as_output(card_index));
315 assert(card_index < MAX_VIDEO_CARDS);
316 if (cards[card_index].parked_capture) {
317 return cards[card_index].parked_capture->get_description();
319 return cards[card_index].capture->get_description();
323 bool card_can_be_used_as_output(unsigned card_index) const {
324 assert(card_index < MAX_VIDEO_CARDS);
325 return cards[card_index].output != nullptr && cards[card_index].capture != nullptr;
328 bool card_is_cef(unsigned card_index) const {
329 assert(card_index < MAX_VIDEO_CARDS);
330 return cards[card_index].type == CardType::CEF_INPUT;
333 bool card_is_ffmpeg(unsigned card_index) const {
334 assert(card_index < MAX_VIDEO_CARDS);
335 if (cards[card_index].type != CardType::FFMPEG_INPUT) {
339 // SRT inputs are more like regular inputs than FFmpeg inputs,
340 // so show them as such. (This allows the user to right-click
341 // to select a different input.)
342 return static_cast<FFmpegCapture *>(cards[card_index].capture.get())->get_srt_sock() == -1;
348 bool card_is_active(unsigned card_index) const {
349 assert(card_index < MAX_VIDEO_CARDS);
350 std::lock_guard<std::mutex> lock(card_mutex);
351 return cards[card_index].capture != nullptr;
354 void force_card_active(unsigned card_index)
356 // handle_hotplugged_cards() will pick this up.
357 std::lock_guard<std::mutex> lock(card_mutex);
358 cards[card_index].force_active = true;
361 std::map<uint32_t, bmusb::VideoMode> get_available_video_modes(unsigned card_index) const {
362 assert(card_index < MAX_VIDEO_CARDS);
363 return cards[card_index].capture->get_available_video_modes();
366 uint32_t get_current_video_mode(unsigned card_index) const {
367 assert(card_index < MAX_VIDEO_CARDS);
368 return cards[card_index].capture->get_current_video_mode();
371 void set_video_mode(unsigned card_index, uint32_t mode) {
372 assert(card_index < MAX_VIDEO_CARDS);
373 cards[card_index].capture->set_video_mode(mode);
376 void start_mode_scanning(unsigned card_index);
378 std::map<uint32_t, std::string> get_available_video_inputs(unsigned card_index) const {
379 assert(card_index < MAX_VIDEO_CARDS);
380 return cards[card_index].capture->get_available_video_inputs();
383 uint32_t get_current_video_input(unsigned card_index) const {
384 assert(card_index < MAX_VIDEO_CARDS);
385 return cards[card_index].capture->get_current_video_input();
388 void set_video_input(unsigned card_index, uint32_t input) {
389 assert(card_index < MAX_VIDEO_CARDS);
390 cards[card_index].capture->set_video_input(input);
393 std::map<uint32_t, std::string> get_available_audio_inputs(unsigned card_index) const {
394 assert(card_index < MAX_VIDEO_CARDS);
395 return cards[card_index].capture->get_available_audio_inputs();
398 uint32_t get_current_audio_input(unsigned card_index) const {
399 assert(card_index < MAX_VIDEO_CARDS);
400 return cards[card_index].capture->get_current_audio_input();
403 void set_audio_input(unsigned card_index, uint32_t input) {
404 assert(card_index < MAX_VIDEO_CARDS);
405 cards[card_index].capture->set_audio_input(input);
408 std::string get_ffmpeg_filename(unsigned card_index) const;
410 void set_ffmpeg_filename(unsigned card_index, const std::string &filename);
412 void change_x264_bitrate(unsigned rate_kbit) {
413 video_encoder->change_x264_bitrate(rate_kbit);
416 int get_output_card_index() const { // -1 = no output, just stream.
417 return desired_output_card_index;
420 void set_output_card(int card_index) { // -1 = no output, just stream.
421 desired_output_card_index = card_index;
424 std::map<uint32_t, bmusb::VideoMode> get_available_output_video_modes() const;
426 uint32_t get_output_video_mode() const {
427 return desired_output_video_mode;
430 void set_output_video_mode(uint32_t mode) {
431 desired_output_video_mode = mode;
434 void set_display_timecode_in_stream(bool enable) {
435 display_timecode_in_stream = enable;
438 void set_display_timecode_on_stdout(bool enable) {
439 display_timecode_on_stdout = enable;
442 int64_t get_num_connected_clients() const {
443 return httpd.get_num_connected_clients();
446 Theme::MenuEntry *get_theme_menu() { return theme->get_theme_menu(); }
448 void theme_menu_entry_clicked(int lua_ref) { return theme->theme_menu_entry_clicked(lua_ref); }
450 void set_theme_menu_callback(std::function<void()> callback)
452 theme->set_theme_menu_callback(callback);
455 void wait_for_next_frame();
460 void configure_card(unsigned card_index, bmusb::CaptureInterface *capture, CardType card_type, DeckLinkOutput *output, bool is_srt_card);
461 void set_output_card_internal(int card_index); // Should only be called from the mixer thread.
462 void bm_frame(unsigned card_index, uint16_t timecode,
463 bmusb::FrameAllocator::Frame video_frame, size_t video_offset, bmusb::VideoFormat video_format,
464 bmusb::FrameAllocator::Frame audio_frame, size_t audio_offset, bmusb::AudioFormat audio_format);
465 void upload_texture_for_frame(
466 int field, bmusb::VideoFormat video_format,
467 size_t y_offset, size_t cbcr_offset, size_t video_offset,
468 PBOFrameAllocator::Userdata *userdata);
469 void bm_hotplug_add(libusb_device *dev);
470 void bm_hotplug_remove(unsigned card_index);
471 void place_rectangle(movit::Effect *resample_effect, movit::Effect *padding_effect, float x0, float y0, float x1, float y1);
473 void handle_hotplugged_cards();
474 void schedule_audio_resampling_tasks(unsigned dropped_frames, int num_samples_per_frame, int length_per_frame, bool is_preroll, std::chrono::steady_clock::time_point frame_timestamp);
475 std::string get_timecode_text() const;
476 void render_one_frame(int64_t duration);
477 void audio_thread_func();
478 void release_display_frame(DisplayFrame *frame);
482 double pts() { return double(pts_int) / TIMEBASE; }
483 void trim_queue(CaptureCard *card, size_t safe_queue_length);
484 std::pair<std::string, std::string> get_channels_json();
485 std::pair<std::string, std::string> get_channel_color_http(unsigned channel_idx);
488 unsigned num_video_inputs, num_html_inputs = 0;
490 QSurface *mixer_surface, *h264_encoder_surface, *decklink_output_surface, *image_update_surface;
491 std::unique_ptr<movit::ResourcePool> resource_pool;
492 std::unique_ptr<Theme> theme;
493 std::atomic<unsigned> audio_source_channel{0};
494 std::atomic<int> master_clock_channel{0}; // Gets overridden by <output_card_index> if set.
495 int output_card_index = -1; // -1 for none.
496 uint32_t output_video_mode = -1;
498 // The mechanics of changing the output card and modes are so intricately connected
499 // with the work the mixer thread is doing. Thus, we don't change it directly,
500 // we just set this variable instead, which signals to the mixer thread that
501 // it should do the change before the next frame. This simplifies locking
502 // considerations immensely.
503 std::atomic<int> desired_output_card_index{-1};
504 std::atomic<uint32_t> desired_output_video_mode{0};
506 std::unique_ptr<movit::EffectChain> display_chain;
507 std::unique_ptr<ChromaSubsampler> chroma_subsampler;
508 std::unique_ptr<v210Converter> v210_converter;
509 std::unique_ptr<VideoEncoder> video_encoder;
510 std::unique_ptr<MJPEGEncoder> mjpeg_encoder;
512 std::unique_ptr<TimecodeRenderer> timecode_renderer;
513 std::atomic<bool> display_timecode_in_stream{false};
514 std::atomic<bool> display_timecode_on_stdout{false};
516 // Effects part of <display_chain>. Owned by <display_chain>.
517 movit::YCbCrInput *display_input;
519 int64_t pts_int = 0; // In TIMEBASE units.
521 mutable std::mutex frame_num_mutex;
522 std::condition_variable frame_num_updated;
523 unsigned frame_num = 0; // Under <frame_num_mutex>.
525 // Accumulated errors in number of 1/TIMEBASE audio samples. If OUTPUT_FREQUENCY divided by
526 // frame rate is integer, will always stay zero.
527 unsigned fractional_samples = 0;
529 // Monotonic counter that lets us know which slot was last turned into
530 // a fake capture. Used for SRT re-plugging.
531 unsigned fake_capture_counter = 0;
533 mutable std::mutex card_mutex;
534 bool has_bmusb_thread = false;
536 // If nullptr, the card is inactive, and will be hidden in the UI.
537 // Only fake capture cards can be inactive.
538 std::unique_ptr<bmusb::CaptureInterface> capture;
539 // If true, card must always be active (typically because it's one of the
540 // first cards, or because the theme has explicitly asked for it).
541 bool force_active = false;
542 bool is_fake_capture;
543 // If is_fake_capture is true, contains a monotonic timer value for when
544 // it was last changed. Otherwise undefined. Used for SRT re-plugging.
545 int fake_capture_counter;
546 std::string last_srt_stream_id = "<default, matches nothing>"; // Used for SRT re-plugging.
548 std::unique_ptr<DeckLinkOutput> output;
550 // CEF only delivers frames when it actually has a change.
551 // If we trim the queue for latency reasons, we could thus
552 // end up in a situation trimming a frame that was meant to
553 // be displayed for a long time, which is really suboptimal.
554 // Thus, if we drop the last frame we have, may_have_dropped_last_frame
555 // is set to true, and the next starvation event will trigger
556 // us requestin a CEF repaint.
557 bool is_cef_capture, may_have_dropped_last_frame = false;
559 // If this card is used for output (ie., output_card_index points to it),
560 // it cannot simultaneously be uesd for capture, so <capture> gets replaced
561 // by a FakeCapture. However, since reconstructing the real capture object
562 // with all its state can be annoying, it is not being deleted, just stopped
564 std::unique_ptr<bmusb::CaptureInterface> parked_capture;
566 std::unique_ptr<PBOFrameAllocator> frame_allocator;
568 // Stuff for the OpenGL context (for texture uploading).
569 QSurface *surface = nullptr;
572 RefCountedFrame frame;
573 int64_t length; // In TIMEBASE units.
575 unsigned field; // Which field (0 or 1) of the frame to use. Always 0 for progressive.
576 bool texture_uploaded = false;
577 unsigned dropped_frames = 0; // Number of dropped frames before this one.
578 std::chrono::steady_clock::time_point received_timestamp = std::chrono::steady_clock::time_point::min();
579 movit::RGBTriplet neutral_color{1.0f, 1.0f, 1.0f};
581 // Used for MJPEG encoding, and texture upload.
582 // width=0 or height=0 means a broken frame, ie., do not upload.
583 bmusb::VideoFormat video_format;
584 size_t video_offset, y_offset, cbcr_offset;
586 std::deque<NewFrame> new_frames;
587 std::condition_variable new_frames_changed; // Set whenever new_frames is changed.
588 QueueLengthPolicy queue_length_policy; // Refers to the "new_frames" queue.
590 std::vector<int32_t> new_raw_audio;
592 int last_timecode = -1; // Unwrapped.
594 JitterHistory jitter_history;
597 std::vector<std::pair<std::string, std::string>> labels;
598 std::atomic<int64_t> metric_input_received_frames{0};
599 std::atomic<int64_t> metric_input_duped_frames{0};
600 std::atomic<int64_t> metric_input_dropped_frames_jitter{0};
601 std::atomic<int64_t> metric_input_dropped_frames_error{0};
602 std::atomic<int64_t> metric_input_resets{0};
603 std::atomic<int64_t> metric_input_queue_length_frames{0};
605 std::atomic<int64_t> metric_input_has_signal_bool{-1};
606 std::atomic<int64_t> metric_input_is_connected_bool{-1};
607 std::atomic<int64_t> metric_input_interlaced_bool{-1};
608 std::atomic<int64_t> metric_input_width_pixels{-1};
609 std::atomic<int64_t> metric_input_height_pixels{-1};
610 std::atomic<int64_t> metric_input_frame_rate_nom{-1};
611 std::atomic<int64_t> metric_input_frame_rate_den{-1};
612 std::atomic<int64_t> metric_input_sample_rate_hz{-1};
615 std::atomic<double> metric_srt_uptime_seconds{0.0 / 0.0};
616 std::atomic<double> metric_srt_send_duration_seconds{0.0 / 0.0};
617 std::atomic<int64_t> metric_srt_sent_bytes{-1};
618 std::atomic<int64_t> metric_srt_received_bytes{-1};
619 std::atomic<int64_t> metric_srt_sent_packets_normal{-1};
620 std::atomic<int64_t> metric_srt_received_packets_normal{-1};
621 std::atomic<int64_t> metric_srt_sent_packets_lost{-1};
622 std::atomic<int64_t> metric_srt_received_packets_lost{-1};
623 std::atomic<int64_t> metric_srt_sent_packets_retransmitted{-1};
624 std::atomic<int64_t> metric_srt_sent_bytes_retransmitted{-1};
625 std::atomic<int64_t> metric_srt_sent_packets_ack{-1};
626 std::atomic<int64_t> metric_srt_received_packets_ack{-1};
627 std::atomic<int64_t> metric_srt_sent_packets_nak{-1};
628 std::atomic<int64_t> metric_srt_received_packets_nak{-1};
629 std::atomic<int64_t> metric_srt_sent_packets_dropped{-1};
630 std::atomic<int64_t> metric_srt_received_packets_dropped{-1};
631 std::atomic<int64_t> metric_srt_sent_bytes_dropped{-1};
632 std::atomic<int64_t> metric_srt_received_bytes_dropped{-1};
633 std::atomic<int64_t> metric_srt_received_packets_undecryptable{-1};
634 std::atomic<int64_t> metric_srt_received_bytes_undecryptable{-1};
636 std::atomic<int64_t> metric_srt_filter_received_extra_packets{-1};
637 std::atomic<int64_t> metric_srt_filter_received_rebuilt_packets{-1};
638 std::atomic<int64_t> metric_srt_filter_received_lost_packets{-1};
640 std::atomic<double> metric_srt_packet_sending_period_seconds{0.0 / 0.0};
641 std::atomic<int64_t> metric_srt_flow_window_packets{-1};
642 std::atomic<int64_t> metric_srt_congestion_window_packets{-1};
643 std::atomic<int64_t> metric_srt_flight_size_packets{-1};
644 std::atomic<double> metric_srt_rtt_seconds{0.0 / 0.0};
645 std::atomic<double> metric_srt_estimated_bandwidth_bits_per_second{0.0 / 0.0};
646 std::atomic<double> metric_srt_bandwidth_ceiling_bits_per_second{0.0 / 0.0};
647 std::atomic<int64_t> metric_srt_send_buffer_available_bytes{-1};
648 std::atomic<int64_t> metric_srt_receive_buffer_available_bytes{-1};
649 std::atomic<int64_t> metric_srt_mss_bytes{-1};
650 std::atomic<int64_t> metric_srt_sender_unacked_packets{-1};
651 std::atomic<int64_t> metric_srt_sender_unacked_bytes{-1};
652 std::atomic<double> metric_srt_sender_unacked_timespan_seconds{0.0 / 0.0};
653 std::atomic<double> metric_srt_sender_delivery_delay_seconds{0.0 / 0.0};
654 std::atomic<int64_t> metric_srt_receiver_unacked_packets{-1};
655 std::atomic<int64_t> metric_srt_receiver_unacked_bytes{-1};
656 std::atomic<double> metric_srt_receiver_unacked_timespan_seconds{0.0 / 0.0};
657 std::atomic<double> metric_srt_receiver_delivery_delay_seconds{0.0 / 0.0};
658 std::atomic<int64_t> metric_srt_filter_sent_packets{-1};
661 JitterHistory output_jitter_history;
662 CaptureCard cards[MAX_VIDEO_CARDS]; // Protected by <card_mutex>.
663 YCbCrInterpretation ycbcr_interpretation[MAX_VIDEO_CARDS]; // Protected by <card_mutex>.
664 movit::RGBTriplet last_received_neutral_color[MAX_VIDEO_CARDS]; // Used by the mixer thread only. Constructor-initialiezd.
665 std::unique_ptr<AudioMixer> audio_mixer; // Same as global_audio_mixer (see audio_mixer.h).
666 bool input_card_is_master_clock(unsigned card_index, unsigned master_card_index) const;
667 struct OutputFrameInfo {
668 int dropped_frames; // Since last frame.
669 int num_samples; // Audio samples needed for this output frame.
670 int64_t frame_duration; // In TIMEBASE units.
672 std::chrono::steady_clock::time_point frame_timestamp;
674 OutputFrameInfo get_one_frame_from_each_card(unsigned master_card_index, bool master_card_is_output, CaptureCard::NewFrame new_frames[MAX_VIDEO_CARDS], bool has_new_frame[MAX_VIDEO_CARDS], std::vector<int32_t> raw_audio[MAX_VIDEO_CARDS]);
677 void update_srt_stats(int srt_sock, Mixer::CaptureCard *card);
680 std::string description_for_card(unsigned card_index);
681 static bool is_srt_card(const CaptureCard *card);
683 InputState input_state;
685 // Cards we have been noticed about being hotplugged, but haven't tried adding yet.
686 // Protected by its own mutex.
687 std::mutex hotplug_mutex;
688 std::vector<libusb_device *> hotplugged_cards;
690 std::vector<int> hotplugged_srt_cards;
693 class OutputChannel {
696 void output_frame(DisplayFrame &&frame);
697 bool get_display_frame(DisplayFrame *frame);
698 void add_frame_ready_callback(void *key, new_frame_ready_callback_t callback);
699 void remove_frame_ready_callback(void *key);
700 void set_transition_names_updated_callback(transition_names_updated_callback_t callback);
701 void set_name_updated_callback(name_updated_callback_t callback);
702 void set_color_updated_callback(color_updated_callback_t callback);
708 Mixer *parent = nullptr; // Not owned.
709 std::mutex frame_mutex;
710 DisplayFrame current_frame, ready_frame; // protected by <frame_mutex>
711 bool has_current_frame = false, has_ready_frame = false; // protected by <frame_mutex>
712 std::map<void *, new_frame_ready_callback_t> new_frame_ready_callbacks; // protected by <frame_mutex>
713 transition_names_updated_callback_t transition_names_updated_callback;
714 name_updated_callback_t name_updated_callback;
715 color_updated_callback_t color_updated_callback;
717 std::vector<std::string> last_transition_names;
718 std::string last_name, last_color;
720 OutputChannel output_channel[NUM_OUTPUTS];
722 std::thread mixer_thread;
723 std::thread audio_thread;
725 std::thread srt_thread;
727 std::atomic<bool> should_quit{false};
728 std::atomic<bool> should_cut{false};
730 std::unique_ptr<ALSAOutput> alsa;
736 std::chrono::steady_clock::time_point frame_timestamp;
738 std::mutex audio_mutex;
739 std::condition_variable audio_task_queue_changed;
740 std::queue<AudioTask> audio_task_queue; // Under audio_mutex.
742 // For mode scanning.
743 bool is_mode_scanning[MAX_VIDEO_CARDS]{ false };
744 std::vector<uint32_t> mode_scanlist[MAX_VIDEO_CARDS];
745 unsigned mode_scanlist_index[MAX_VIDEO_CARDS]{ 0 };
746 std::chrono::steady_clock::time_point last_mode_scan_change[MAX_VIDEO_CARDS];
749 extern Mixer *global_mixer;
751 #endif // !defined(_MIXER_H)