4 // The actual video mixer, running in its own separate background thread.
11 #include <movit/effect_chain.h>
12 #include <movit/flat_input.h>
13 #include <zita-resampler/resampler.h>
15 #include <condition_variable>
24 #include "bmusb/bmusb.h"
25 #include "alsa_output.h"
26 #include "ebu_r128_proc.h"
27 #include "h264encode.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"
35 #include "stereocompressor.h"
37 #include "input_state.h"
56 // The surface format is used for offscreen destinations for OpenGL contexts we need.
57 Mixer(const QSurfaceFormat &format, unsigned num_cards);
62 void transition_clicked(int transition_num);
63 void channel_clicked(int preview_num);
68 OUTPUT_INPUT0, // 1, 2, 3, up to 15 follow numerically.
73 // The chain for rendering this frame. To render a display frame,
74 // first wait for <ready_fence>, then call <setup_chain>
75 // to wire up all the inputs, and then finally call
76 // chain->render_to_screen() or similar.
77 movit::EffectChain *chain;
78 std::function<void()> setup_chain;
80 // Asserted when all the inputs are ready; you cannot render the chain
82 RefCountedGLsync ready_fence;
84 // Holds on to all the input frames needed for this display frame,
85 // so they are not released while still rendering.
86 std::vector<RefCountedFrame> input_frames;
88 // Textures that should be released back to the resource pool
89 // when this frame disappears, if any.
90 // TODO: Refcount these as well?
91 std::vector<GLuint> temp_textures;
93 // Implicitly frees the previous one if there's a new frame available.
94 bool get_display_frame(Output output, DisplayFrame *frame) {
95 return output_channel[output].get_display_frame(frame);
98 typedef std::function<void()> new_frame_ready_callback_t;
99 void set_frame_ready_callback(Output output, new_frame_ready_callback_t callback)
101 output_channel[output].set_frame_ready_callback(callback);
104 typedef std::function<void(float level_lufs, float peak_db,
105 float global_level_lufs, float range_low_lufs, float range_high_lufs,
106 float auto_gain_staging_db)> audio_level_callback_t;
107 void set_audio_level_callback(audio_level_callback_t callback)
109 audio_level_callback = callback;
112 std::vector<std::string> get_transition_names()
114 return theme->get_transition_names(pts());
117 unsigned get_num_channels() const
119 return theme->get_num_channels();
122 std::string get_channel_name(unsigned channel) const
124 return theme->get_channel_name(channel);
127 bool get_supports_set_wb(unsigned channel) const
129 return theme->get_supports_set_wb(channel);
132 void set_wb(unsigned channel, double r, double g, double b) const
134 theme->set_wb(channel, r, g, b);
137 void set_locut_cutoff(float cutoff_hz)
139 locut_cutoff_hz = cutoff_hz;
142 float get_limiter_threshold_dbfs()
144 return limiter_threshold_dbfs;
147 float get_compressor_threshold_dbfs()
149 return compressor_threshold_dbfs;
152 void set_limiter_threshold_dbfs(float threshold_dbfs)
154 limiter_threshold_dbfs = threshold_dbfs;
157 void set_compressor_threshold_dbfs(float threshold_dbfs)
159 compressor_threshold_dbfs = threshold_dbfs;
162 void set_limiter_enabled(bool enabled)
164 limiter_enabled = enabled;
167 void set_compressor_enabled(bool enabled)
169 compressor_enabled = enabled;
172 void set_gainstaging_auto(bool enabled)
174 level_compressor = enabled;
185 void bm_frame(unsigned card_index, uint16_t timecode,
186 FrameAllocator::Frame video_frame, size_t video_offset, uint16_t video_format,
187 FrameAllocator::Frame audio_frame, size_t audio_offset, uint16_t audio_format);
188 void place_rectangle(movit::Effect *resample_effect, movit::Effect *padding_effect, float x0, float y0, float x1, float y1);
190 void audio_thread_func();
191 void process_audio_one_frame(int64_t frame_pts_int, int num_samples);
192 void subsample_chroma(GLuint src_tex, GLuint dst_dst);
193 void release_display_frame(DisplayFrame *frame);
194 double pts() { return double(pts_int) / TIMEBASE; }
199 QSurface *mixer_surface, *h264_encoder_surface;
200 std::unique_ptr<movit::ResourcePool> resource_pool;
201 std::unique_ptr<Theme> theme;
202 std::unique_ptr<movit::EffectChain> display_chain;
203 GLuint cbcr_program_num; // Owned by <resource_pool>.
204 std::unique_ptr<H264Encoder> h264_encoder;
206 // Effects part of <display_chain>. Owned by <display_chain>.
207 movit::FlatInput *display_input;
209 int64_t pts_int = 0; // In TIMEBASE units.
211 std::mutex bmusb_mutex;
214 std::unique_ptr<PBOFrameAllocator> frame_allocator;
216 // Stuff for the OpenGL context (for texture uploading).
218 QOpenGLContext *context;
220 bool new_data_ready = false; // Whether new_frame contains anything.
221 bool should_quit = false;
222 RefCountedFrame new_frame;
223 int64_t new_frame_length; // In TIMEBASE units.
224 bool new_frame_interlaced;
225 unsigned new_frame_field; // Which field (0 or 1) of the frame to use. Always 0 for progressive.
226 GLsync new_data_ready_fence; // Whether new_frame is ready for rendering.
227 std::condition_variable new_data_ready_changed; // Set whenever new_data_ready is changed.
228 unsigned dropped_frames = 0; // Before new_frame.
230 // Accumulated errors in number of 1/TIMEBASE samples. If OUTPUT_FREQUENCY divided by
231 // frame rate is integer, will always stay zero.
232 unsigned fractional_samples = 0;
234 std::mutex audio_mutex;
235 std::unique_ptr<ResamplingQueue> resampling_queue; // Under audio_mutex.
236 int last_timecode = -1; // Unwrapped.
237 int64_t next_local_pts = 0; // Beginning of next frame, in TIMEBASE units.
239 CaptureCard cards[MAX_CARDS]; // protected by <bmusb_mutex>
241 InputState input_state;
243 class OutputChannel {
246 void output_frame(DisplayFrame frame);
247 bool get_display_frame(DisplayFrame *frame);
248 void set_frame_ready_callback(new_frame_ready_callback_t callback);
253 Mixer *parent = nullptr; // Not owned.
254 std::mutex frame_mutex;
255 DisplayFrame current_frame, ready_frame; // protected by <frame_mutex>
256 bool has_current_frame = false, has_ready_frame = false; // protected by <frame_mutex>
257 new_frame_ready_callback_t new_frame_ready_callback;
258 bool has_new_frame_ready_callback = false;
260 OutputChannel output_channel[NUM_OUTPUTS];
262 std::thread mixer_thread;
263 std::thread audio_thread;
264 std::atomic<bool> should_quit{false};
265 std::atomic<bool> should_cut{false};
267 audio_level_callback_t audio_level_callback = nullptr;
268 std::mutex r128_mutex;
269 Ebu_r128_proc r128; // Under r128_mutex.
271 Resampler peak_resampler;
272 std::atomic<float> peak{0.0f};
274 StereoFilter locut; // Default cutoff 150 Hz, 24 dB/oct.
275 std::atomic<float> locut_cutoff_hz;
277 // First compressor; takes us up to about -12 dBFS.
278 StereoCompressor level_compressor;
279 float last_gain_staging_db = 0.0f;
280 std::atomic<bool> level_compressor_enabled{true};
282 static constexpr float ref_level_dbfs = -14.0f;
284 StereoCompressor limiter;
285 std::atomic<float> limiter_threshold_dbfs{ref_level_dbfs + 4.0f}; // 4 dB.
286 std::atomic<bool> limiter_enabled{true};
287 StereoCompressor compressor;
288 std::atomic<float> compressor_threshold_dbfs{ref_level_dbfs - 12.0f}; // -12 dB.
289 std::atomic<bool> compressor_enabled{true};
291 std::unique_ptr<ALSAOutput> alsa;
297 std::mutex audio_mutex;
298 std::condition_variable audio_task_queue_changed;
299 std::queue<AudioTask> audio_task_queue; // Under audio_mutex.
302 extern Mixer *global_mixer;
304 #endif // !defined(_MIXER_H)