git.sesse.net Git - nageru/blob - futatabi/video_stream.h

   1 #ifndef _VIDEO_STREAM_H
   2 #define _VIDEO_STREAM_H 1
   3
   4 #include <epoxy/gl.h>
   5 #include <stdint.h>
   6
   7 extern "C" {
   8 #include <libavformat/avio.h>
   9 }
  10
  11 #include "frame_on_disk.h"
  12 #include "jpeg_frame_view.h"
  13 #include "shared/ref_counted_gl_sync.h"
  14 #include "queue_spot_holder.h"
  15
  16 #include <atomic>
  17 #include <chrono>
  18 #include <condition_variable>
  19 #include <deque>
  20 #include <functional>
  21 #include <movit/effect_chain.h>
  22 #include <movit/mix_effect.h>
  23 #include <movit/ycbcr_input.h>
  24 #include <mutex>
  25 #include <string>
  26 #include <thread>
  27
  28 class ChromaSubsampler;
  29 class DISComputeFlow;
  30 class Interpolate;
  31 class Mux;
  32 class QSurface;
  33 class QSurfaceFormat;
  34 class YCbCrConverter;
  35
  36 class VideoStream {
  37 public:
  38         VideoStream();
  39         ~VideoStream();
  40         void start();
  41         void stop();
  42         void clear_queue();
  43
  44         // “display_func” is called after the frame has been calculated (if needed)
  45         // and has gone out to the stream.
  46         void schedule_original_frame(std::chrono::steady_clock::time_point,
  47                                      int64_t output_pts, std::function<void()> &&display_func,
  48                                      QueueSpotHolder &&queue_spot_holder,
  49                                      FrameOnDisk frame);
  50         void schedule_faded_frame(std::chrono::steady_clock::time_point, int64_t output_pts,
  51                                   std::function<void()> &&display_func,
  52                                   QueueSpotHolder &&queue_spot_holder,
  53                                   FrameOnDisk frame1, FrameOnDisk frame2,
  54                                   float fade_alpha);
  55         void schedule_interpolated_frame(std::chrono::steady_clock::time_point, int64_t output_pts,
  56                                   std::function<void(std::shared_ptr<Frame>)> &&display_func,
  57                                   QueueSpotHolder &&queue_spot_holder,
  58                                   FrameOnDisk frame1, FrameOnDisk frame2,
  59                                   float alpha, FrameOnDisk secondary_frame = {},  // Empty = no secondary (fade) frame.
  60                                   float fade_alpha = 0.0f);
  61         void schedule_refresh_frame(std::chrono::steady_clock::time_point, int64_t output_pts,
  62                                     std::function<void()> &&display_func,
  63                                     QueueSpotHolder &&queue_spot_holder);
  64
  65 private:
  66         FrameReader frame_reader;
  67
  68         void encode_thread_func();
  69         std::thread encode_thread;
  70         std::atomic<bool> should_quit{false};
  71
  72         static int write_packet2_thunk(void *opaque, uint8_t *buf, int buf_size, AVIODataMarkerType type, int64_t time);
  73         int write_packet2(uint8_t *buf, int buf_size, AVIODataMarkerType type, int64_t time);
  74
  75         // Allocated at the very start; if we're empty, we start dropping frames
  76         // (so that we don't build up an infinite interpolation backlog).
  77         struct InterpolatedFrameResources {
  78                 VideoStream *owner;  // Used only for IFRReleaser, below.
  79
  80                 GLuint input_tex;  // Layered (contains both input frames), Y'CbCr.
  81                 GLuint gray_tex;  // Same, but Y only.
  82                 GLuint input_fbos[2];  // For rendering to the two layers of input_tex.
  83
  84                 // Destination textures and FBO if there is a fade.
  85                 GLuint fade_y_output_tex, fade_cbcr_output_tex;
  86                 GLuint fade_fbo;
  87
  88                 GLuint cb_tex, cr_tex;  // Subsampled, final output.
  89
  90                 GLuint pbo;  // For reading the data back.
  91                 void *pbo_contents;  // Persistently mapped.
  92         };
  93         std::mutex queue_lock;
  94         std::deque<std::unique_ptr<InterpolatedFrameResources>> interpolate_resources;  // Under <queue_lock>.
  95         static constexpr size_t num_interpolate_slots = 15;  // Should be larger than Player::max_queued_frames, or we risk mass-dropping frames.
  96
  97         struct IFRReleaser {
  98                 void operator() (InterpolatedFrameResources *ifr) const
  99                 {
 100                         if (ifr != nullptr) {
 101                                 std::unique_lock<std::mutex> lock(ifr->owner->queue_lock);
 102                                 ifr->owner->interpolate_resources.emplace_back(ifr);
 103                         }
 104                 }
 105         };
 106         using BorrowedInterpolatedFrameResources = std::unique_ptr<InterpolatedFrameResources, IFRReleaser>;
 107
 108         struct QueuedFrame {
 109                 std::chrono::steady_clock::time_point local_pts;
 110
 111                 int64_t output_pts;
 112                 enum Type { ORIGINAL, FADED, INTERPOLATED, FADED_INTERPOLATED, REFRESH } type;
 113                 FrameOnDisk frame1;  // The only frame for original frames.
 114
 115                 // For fades only (including fades against interpolated frames).
 116                 FrameOnDisk secondary_frame;
 117
 118                 // For interpolated frames only.
 119                 FrameOnDisk frame2;
 120                 float alpha;
 121                 BorrowedInterpolatedFrameResources resources;
 122                 RefCountedGLsync fence;  // Set when the interpolated image is read back to the CPU.
 123                 GLuint flow_tex, output_tex, cbcr_tex;  // Released in the receiving thread; not really used for anything else.
 124                 FrameOnDisk id;
 125
 126                 std::function<void()> display_func;  // Called when the image is done decoding.
 127                 std::function<void(std::shared_ptr<Frame>)> display_decoded_func;  // Same, except for INTERPOLATED and FADED_INTERPOLATED.
 128
 129                 QueueSpotHolder queue_spot_holder;
 130         };
 131         std::deque<QueuedFrame> frame_queue;  // Under <queue_lock>.
 132         std::condition_variable queue_changed;
 133
 134         std::unique_ptr<Mux> stream_mux;  // To HTTP.
 135         std::string stream_mux_header;
 136         bool seen_sync_markers = false;
 137
 138         std::unique_ptr<YCbCrConverter> ycbcr_converter;
 139         std::unique_ptr<YCbCrConverter> ycbcr_semiplanar_converter;
 140
 141         // Frame interpolation.
 142         std::unique_ptr<DISComputeFlow> compute_flow;
 143         std::unique_ptr<Interpolate> interpolate, interpolate_no_split;
 144         std::unique_ptr<ChromaSubsampler> chroma_subsampler;
 145
 146         std::vector<uint8_t> last_frame;
 147 };
 148
 149 #endif  // !defined(_VIDEO_STREAM_H)