Make it possible to choose the DeckLink output video mode through the GUI.

[nageru] / mixer.h

diff --git a/mixer.h b/mixer.h
index b7c5ef790761fcab8fae0d9b4659d4ee63e53fc9..bf388b1cece6edf6f1b98928ba70c023a784e535 100644 (file)
--- a/mixer.h
+++ b/mixer.h
@@ -234,6 +234,25 @@ public:
                return cards[card_index].capture->get_description();
        }
 
+       // The difference between this and the previous function is that if a card
+       // is used as the current output, get_card_description() will return the
+       // fake card that's replacing it for input, whereas this function will return
+       // the card's actual name.
+       std::string get_output_card_description(unsigned card_index) const {
+               assert(card_can_be_used_as_output(card_index));
+               assert(card_index < num_cards);
+               if (cards[card_index].parked_capture) {
+                       return cards[card_index].parked_capture->get_description();
+               } else {
+                       return cards[card_index].capture->get_description();
+               }
+       }
+
+       bool card_can_be_used_as_output(unsigned card_index) const {
+               assert(card_index < num_cards);
+               return cards[card_index].output != nullptr;
+       }
+
        std::map<uint32_t, bmusb::VideoMode> get_available_video_modes(unsigned card_index) const {
                assert(card_index < num_cards);
                return cards[card_index].capture->get_available_video_modes();
@@ -285,9 +304,27 @@ public:
                video_encoder->change_x264_bitrate(rate_kbit);
        }
 
+       int get_output_card_index() const {  // -1 = no output, just stream.
+               return desired_output_card_index;
+       }
+
+       void set_output_card(int card_index) { // -1 = no output, just stream.
+               desired_output_card_index = card_index;
+       }
+
+       std::map<uint32_t, bmusb::VideoMode> get_available_output_video_modes() const;
+
+       uint32_t get_output_video_mode() const {
+               return desired_output_video_mode;
+       }
+
+       void set_output_video_mode(uint32_t mode) {
+               desired_output_video_mode = mode;
+       }
+
 private:
        void configure_card(unsigned card_index, bmusb::CaptureInterface *capture, bool is_fake_capture, DeckLinkOutput *output);
-       void set_output_card(int card_index); // -1 = no output, just stream.
+       void set_output_card_internal(int card_index);  // Should only be called from the mixer thread.
        void bm_frame(unsigned card_index, uint16_t timecode,
                bmusb::FrameAllocator::Frame video_frame, size_t video_offset, bmusb::VideoFormat video_format,
                bmusb::FrameAllocator::Frame audio_frame, size_t audio_offset, bmusb::AudioFormat audio_format);
@@ -296,7 +333,7 @@ private:
        void place_rectangle(movit::Effect *resample_effect, movit::Effect *padding_effect, float x0, float y0, float x1, float y1);
        void thread_func();
        void handle_hotplugged_cards();
-       void schedule_audio_resampling_tasks(unsigned dropped_frames, int num_samples_per_frame, int length_per_frame);
+       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);
        void render_one_frame(int64_t duration);
        void audio_thread_func();
        void release_display_frame(DisplayFrame *frame);
@@ -310,7 +347,17 @@ private:
        std::unique_ptr<Theme> theme;
        std::atomic<unsigned> audio_source_channel{0};
        std::atomic<int> master_clock_channel{0};  // Gets overridden by <output_card_index> if set.
-       std::atomic<int> output_card_index{-1};  // -1 for none.
+       int output_card_index = -1;  // -1 for none.
+       uint32_t output_video_mode = -1;
+
+       // The mechanics of changing the output card and modes are so intricately connected
+       // with the work the mixer thread is doing. Thus, we don't change it directly,
+       // we just set this variable instead, which signals to the mixer thread that
+       // it should do the change before the next frame. This simplifies locking
+       // considerations immensely.
+       std::atomic<int> desired_output_card_index{-1};
+       std::atomic<uint32_t> desired_output_video_mode{0};
+
        std::unique_ptr<movit::EffectChain> display_chain;
        std::unique_ptr<ChromaSubsampler> chroma_subsampler;
        std::unique_ptr<VideoEncoder> video_encoder;
@@ -324,7 +371,7 @@ private:
        // frame rate is integer, will always stay zero.
        unsigned fractional_samples = 0;
 
-       std::mutex card_mutex;
+       mutable std::mutex card_mutex;
        bool has_bmusb_thread = false;
        struct CaptureCard {
                std::unique_ptr<bmusb::CaptureInterface> capture;
@@ -367,6 +414,8 @@ private:
                int dropped_frames;  // Since last frame.
                int num_samples;  // Audio samples needed for this output frame.
                int64_t frame_duration;  // In TIMEBASE units.
+               bool is_preroll;
+               std::chrono::steady_clock::time_point frame_timestamp;
        };
        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]);
 
@@ -416,6 +465,7 @@ private:
                int64_t pts_int;
                int num_samples;
                bool adjust_rate;
+               std::chrono::steady_clock::time_point frame_timestamp;
        };
        std::mutex audio_mutex;
        std::condition_variable audio_task_queue_changed;