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         void encode_thread_func();
  66         std::thread encode_thread;
  67
  68         static int write_packet2_thunk(void *opaque, uint8_t *buf, int buf_size, AVIODataMarkerType type, int64_t time);
  69         int write_packet2(uint8_t *buf, int buf_size, AVIODataMarkerType type, int64_t time);
  70
  71         // Allocated at the very start; if we're empty, we start dropping frames
  72         // (so that we don't build up an infinite interpolation backlog).
  73         struct InterpolatedFrameResources {
  74                 VideoStream *owner;  // Used only for IFRReleaser, below.
  75
  76                 GLuint input_tex;  // Layered (contains both input frames), Y'CbCr.
  77                 GLuint gray_tex;  // Same, but Y only.
  78                 GLuint input_fbos[2];  // For rendering to the two layers of input_tex.
  79
  80                 // Destination textures and FBO if there is a fade.
  81                 GLuint fade_y_output_tex, fade_cbcr_output_tex;
  82                 GLuint fade_fbo;
  83
  84                 GLuint cb_tex, cr_tex;  // Subsampled, final output.
  85
  86                 GLuint pbo;  // For reading the data back.
  87                 void *pbo_contents;  // Persistently mapped.
  88         };
  89         std::mutex queue_lock;
  90         std::deque<std::unique_ptr<InterpolatedFrameResources>> interpolate_resources;  // Under <queue_lock>.
  91         static constexpr size_t num_interpolate_slots = 15;  // Should be larger than Player::max_queued_frames, or we risk mass-dropping frames.
  92
  93         struct IFRReleaser {
  94                 void operator() (InterpolatedFrameResources *ifr) const
  95                 {
  96                         if (ifr != nullptr) {
  97                                 std::unique_lock<std::mutex> lock(ifr->owner->queue_lock);
  98                                 ifr->owner->interpolate_resources.emplace_back(ifr);
  99                         }
 100                 }
 101         };
 102         using BorrowedInterpolatedFrameResources = std::unique_ptr<InterpolatedFrameResources, IFRReleaser>;
 103
 104         struct QueuedFrame {
 105                 std::chrono::steady_clock::time_point local_pts;
 106
 107                 int64_t output_pts;
 108                 enum Type { ORIGINAL, FADED, INTERPOLATED, FADED_INTERPOLATED, REFRESH } type;
 109                 FrameOnDisk frame1;  // The only frame for original frames.
 110
 111                 // For fades only (including fades against interpolated frames).
 112                 FrameOnDisk secondary_frame;
 113
 114                 // For interpolated frames only.
 115                 FrameOnDisk frame2;
 116                 float alpha;
 117                 BorrowedInterpolatedFrameResources resources;
 118                 RefCountedGLsync fence;  // Set when the interpolated image is read back to the CPU.
 119                 GLuint flow_tex, output_tex, cbcr_tex;  // Released in the receiving thread; not really used for anything else.
 120                 FrameOnDisk id;
 121
 122                 std::function<void()> display_func;  // Called when the image is done decoding.
 123                 std::function<void(std::shared_ptr<Frame>)> display_decoded_func;  // Same, except for INTERPOLATED and FADED_INTERPOLATED.
 124
 125                 QueueSpotHolder queue_spot_holder;
 126         };
 127         std::deque<QueuedFrame> frame_queue;  // Under <queue_lock>.
 128         std::condition_variable queue_changed;
 129
 130         std::unique_ptr<Mux> stream_mux;  // To HTTP.
 131         std::string stream_mux_header;
 132         bool seen_sync_markers = false;
 133
 134         std::unique_ptr<YCbCrConverter> ycbcr_converter;
 135         std::unique_ptr<YCbCrConverter> ycbcr_semiplanar_converter;
 136
 137         // Frame interpolation.
 138         std::unique_ptr<DISComputeFlow> compute_flow;
 139         std::unique_ptr<Interpolate> interpolate, interpolate_no_split;
 140         std::unique_ptr<ChromaSubsampler> chroma_subsampler;
 141
 142         std::vector<uint8_t> last_frame;
 143 };
 144
 145 #endif  // !defined(_VIDEO_STREAM_H)