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