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 <condition_variable>
  14 #include <cstddef>
  15 #include <functional>
  16 #include <memory>
  17 #include <mutex>
  18 #include <string>
  19 #include <thread>
  20 #include <vector>
  21
  22 #include "bmusb/bmusb.h"
  23 #include "ebu_r128_proc.h"
  24 #include "h264encode.h"
  25 #include "httpd.h"
  26 #include "pbo_frame_allocator.h"
  27 #include "ref_counted_frame.h"
  28 #include "ref_counted_gl_sync.h"
  29 #include "resampler.h"
  30 #include "theme.h"
  31 #include "timebase.h"
  32
  33 class H264Encoder;
  34 class QSurface;
  35 namespace movit {
  36 class Effect;
  37 class EffectChain;
  38 class FlatInput;
  39 class ResourcePool;
  40 }  // namespace movit
  41
  42 namespace movit {
  43 class YCbCrInput;
  44 }
  45 class QOpenGLContext;
  46 class QSurfaceFormat;
  47
  48 class Mixer {
  49 public:
  50         // The surface format is used for offscreen destinations for OpenGL contexts we need.
  51         Mixer(const QSurfaceFormat &format, unsigned num_cards);
  52         ~Mixer();
  53         void start();
  54         void quit();
  55
  56         void transition_clicked(int transition_num);
  57         void channel_clicked(int preview_num);
  58
  59         enum Output {
  60                 OUTPUT_LIVE = 0,
  61                 OUTPUT_PREVIEW,
  62                 OUTPUT_INPUT0,  // 1, 2, 3, up to 15 follow numerically.
  63                 NUM_OUTPUTS = 18
  64         };
  65
  66         struct DisplayFrame {
  67                 // The chain for rendering this frame. To render a display frame,
  68                 // first wait for <ready_fence>, then call <setup_chain>
  69                 // to wire up all the inputs, and then finally call
  70                 // chain->render_to_screen() or similar.
  71                 movit::EffectChain *chain;
  72                 std::function<void()> setup_chain;
  73
  74                 // Asserted when all the inputs are ready; you cannot render the chain
  75                 // before this.
  76                 RefCountedGLsync ready_fence;
  77
  78                 // Holds on to all the input frames needed for this display frame,
  79                 // so they are not released while still rendering.
  80                 std::vector<RefCountedFrame> input_frames;
  81
  82                 // Textures that should be released back to the resource pool
  83                 // when this frame disappears, if any.
  84                 // TODO: Refcount these as well?
  85                 std::vector<GLuint> temp_textures;
  86         };
  87         // Implicitly frees the previous one if there's a new frame available.
  88         bool get_display_frame(Output output, DisplayFrame *frame) {
  89                 return output_channel[output].get_display_frame(frame);
  90         }
  91
  92         typedef std::function<void()> new_frame_ready_callback_t;
  93         void set_frame_ready_callback(Output output, new_frame_ready_callback_t callback)
  94         {
  95                 output_channel[output].set_frame_ready_callback(callback);
  96         }
  97
  98         typedef std::function<void(float, float, float, float, float)> audio_level_callback_t;
  99         void set_audio_level_callback(audio_level_callback_t callback)
 100         {
 101                 audio_level_callback = callback;
 102         }
 103
 104         std::vector<std::string> get_transition_names()
 105         {
 106                 return theme->get_transition_names(pts());
 107         }
 108
 109         unsigned get_num_channels() const
 110         {
 111                 return theme->get_num_channels();
 112         }
 113
 114         std::string get_channel_name(unsigned channel) const
 115         {
 116                 return theme->get_channel_name(channel);
 117         }
 118
 119         bool get_supports_set_wb(unsigned channel) const
 120         {
 121                 return theme->get_supports_set_wb(channel);
 122         }
 123
 124 private:
 125         void bm_frame(unsigned card_index, uint16_t timecode,
 126                 FrameAllocator::Frame video_frame, size_t video_offset, uint16_t video_format,
 127                 FrameAllocator::Frame audio_frame, size_t audio_offset, uint16_t audio_format);
 128         void place_rectangle(movit::Effect *resample_effect, movit::Effect *padding_effect, float x0, float y0, float x1, float y1);
 129         void thread_func();
 130         void subsample_chroma(GLuint src_tex, GLuint dst_dst);
 131         void release_display_frame(DisplayFrame *frame);
 132         double pts() { return double(pts_int) / TIMEBASE; }
 133
 134         HTTPD httpd;
 135         unsigned num_cards;
 136
 137         QSurface *mixer_surface, *h264_encoder_surface;
 138         std::unique_ptr<movit::ResourcePool> resource_pool;
 139         std::unique_ptr<Theme> theme;
 140         std::unique_ptr<movit::EffectChain> display_chain;
 141         GLuint cbcr_program_num;  // Owned by <resource_pool>.
 142         std::unique_ptr<H264Encoder> h264_encoder;
 143
 144         // Effects part of <display_chain>. Owned by <display_chain>.
 145         movit::FlatInput *display_input;
 146
 147         int64_t pts_int = 0;  // In TIMEBASE units.
 148
 149         std::mutex bmusb_mutex;
 150         struct CaptureCard {
 151                 BMUSBCapture *usb;
 152                 std::unique_ptr<PBOFrameAllocator> frame_allocator;
 153
 154                 // Stuff for the OpenGL context (for texture uploading).
 155                 QSurface *surface;
 156                 QOpenGLContext *context;
 157
 158                 bool new_data_ready = false;  // Whether new_frame and new_frame_audio contains anything.
 159                 bool should_quit = false;
 160                 RefCountedFrame new_frame;
 161                 GLsync new_data_ready_fence;  // Whether new_frame is ready for rendering.
 162                 std::vector<float> new_frame_audio;
 163                 std::condition_variable new_data_ready_changed;  // Set whenever new_data_ready is changed.
 164                 unsigned dropped_frames = 0;  // Before new_frame.
 165
 166                 std::mutex audio_mutex;
 167                 std::unique_ptr<Resampler> resampler;  // Under audio_mutex.
 168                 int last_timecode = -1;  // Unwrapped.
 169         };
 170         CaptureCard cards[MAX_CARDS];  // protected by <bmusb_mutex>
 171
 172         RefCountedFrame bmusb_current_rendering_frame[MAX_CARDS];
 173
 174         class OutputChannel {
 175         public:
 176                 ~OutputChannel();
 177                 void output_frame(DisplayFrame frame);
 178                 bool get_display_frame(DisplayFrame *frame);
 179                 void set_frame_ready_callback(new_frame_ready_callback_t callback);
 180
 181         private:
 182                 friend class Mixer;
 183
 184                 Mixer *parent = nullptr;  // Not owned.
 185                 std::mutex frame_mutex;
 186                 DisplayFrame current_frame, ready_frame;  // protected by <frame_mutex>
 187                 bool has_current_frame = false, has_ready_frame = false;  // protected by <frame_mutex>
 188                 new_frame_ready_callback_t new_frame_ready_callback;
 189                 bool has_new_frame_ready_callback = false;
 190         };
 191         OutputChannel output_channel[NUM_OUTPUTS];
 192
 193         std::thread mixer_thread;
 194         bool should_quit = false;
 195
 196         audio_level_callback_t audio_level_callback = nullptr;
 197         Ebu_r128_proc r128;
 198
 199         // TODO: Implement oversampled peak detection.
 200         float peak = 0.0f;
 201 };
 202
 203 extern Mixer *global_mixer;
 204
 205 #endif  // !defined(_MIXER_H)