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

   1 #ifndef _VIDEO_STREAM_H
   2 #define _VIDEO_STREAM_H 1
   3
   4 #include <stdint.h>
   5 #include <epoxy/gl.h>
   6
   7 extern "C" {
   8 #include <libavformat/avio.h>
   9 }
  10
  11 #include <condition_variable>
  12 #include <deque>
  13 #include <mutex>
  14 #include <string>
  15 #include <thread>
  16
  17 #include <movit/effect_chain.h>
  18 #include <movit/ycbcr_input.h>
  19
  20 #include "ref_counted_gl_sync.h"
  21
  22 class ChromaSubsampler;
  23 class DISComputeFlow;
  24 class Interpolate;
  25 class Mux;
  26 class QSurface;
  27 class QSurfaceFormat;
  28 class YCbCrConverter;
  29
  30 class VideoStream {
  31 public:
  32         VideoStream();
  33         ~VideoStream();
  34         void start();
  35         void stop();
  36
  37         void schedule_original_frame(int64_t output_pts, unsigned stream_idx, int64_t input_pts);
  38         void schedule_interpolated_frame(int64_t output_pts, unsigned stream_idx, int64_t input_first_pts, int64_t input_second_pts, float alpha);
  39
  40 private:
  41
  42         void encode_thread_func();
  43         std::thread encode_thread;
  44
  45         static int write_packet2_thunk(void *opaque, uint8_t *buf, int buf_size, AVIODataMarkerType type, int64_t time);
  46         int write_packet2(uint8_t *buf, int buf_size, AVIODataMarkerType type, int64_t time);
  47
  48         // Allocated at the very start; if we're empty, we start dropping frames
  49         // (so that we don't build up an infinite interpolation backlog).
  50         struct InterpolatedFrameResources {
  51                 GLuint input_tex;  // Layered (contains both input frames).
  52                 GLuint gray_tex;  // Same.
  53                 GLuint cb_tex, cr_tex;
  54                 GLuint input_fbos[2];  // For rendering to the two layers of input_tex.
  55                 GLuint pbo;  // For reading the data back.
  56                 void *pbo_contents;  // Persistently mapped.
  57         };
  58         std::deque<InterpolatedFrameResources> interpolate_resources;  // Under <queue_lock>.
  59         static constexpr size_t num_interpolate_slots = 10;
  60
  61         struct QueuedFrame {
  62                 int64_t output_pts;
  63                 enum Type { ORIGINAL, INTERPOLATED } type;
  64                 unsigned stream_idx;
  65                 int64_t input_first_pts;  // The only pts for original frames.
  66
  67                 // For interpolated frames only.
  68                 int64_t input_second_pts;
  69                 float alpha;
  70                 InterpolatedFrameResources resources;
  71                 RefCountedGLsync fence;  // Set when the interpolated image is read back to the CPU.
  72                 GLuint flow_tex, output_tex, cbcr_tex;  // Released in the receiving thread; not really used for anything else.
  73         };
  74         std::deque<QueuedFrame> frame_queue;  // Under <queue_lock>.
  75         std::mutex queue_lock;
  76         std::condition_variable queue_nonempty;
  77
  78         std::unique_ptr<Mux> stream_mux;  // To HTTP.
  79         std::string stream_mux_header;
  80         bool seen_sync_markers = false;
  81
  82         std::unique_ptr<YCbCrConverter> ycbcr_converter;
  83
  84         // Frame interpolation.
  85         std::unique_ptr<DISComputeFlow> compute_flow;
  86         std::unique_ptr<Interpolate> interpolate;
  87         std::unique_ptr<ChromaSubsampler> chroma_subsampler;
  88 };
  89
  90 #endif  // !defined(_VIDEO_STREAM_H)