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
  29 class VideoStream {
  30 public:
  31         VideoStream();
  32         ~VideoStream();
  33         void start();
  34         void stop();
  35
  36         void schedule_original_frame(int64_t output_pts, unsigned stream_idx, int64_t input_pts);
  37         void schedule_interpolated_frame(int64_t output_pts, unsigned stream_idx, int64_t input_first_pts, int64_t input_second_pts, float alpha);
  38
  39 private:
  40
  41         void encode_thread_func();
  42         std::thread encode_thread;
  43
  44         static int write_packet2_thunk(void *opaque, uint8_t *buf, int buf_size, AVIODataMarkerType type, int64_t time);
  45         int write_packet2(uint8_t *buf, int buf_size, AVIODataMarkerType type, int64_t time);
  46
  47         // Allocated at the very start; if we're empty, we start dropping frames
  48         // (so that we don't build up an infinite interpolation backlog).
  49         struct InterpolatedFrameResources {
  50                 GLuint input_tex;  // Layered (contains both input frames).
  51                 GLuint gray_tex;  // Same.
  52                 GLuint cb_tex, cr_tex;
  53                 GLuint input_fbos[2];  // For rendering to the two layers of input_tex.
  54                 GLuint pbo;  // For reading the data back.
  55                 void *pbo_contents;  // Persistently mapped.
  56         };
  57         std::deque<InterpolatedFrameResources> interpolate_resources;  // Under <queue_lock>.
  58         static constexpr size_t num_interpolate_slots = 10;
  59
  60         struct QueuedFrame {
  61                 int64_t output_pts;
  62                 enum Type { ORIGINAL, INTERPOLATED } type;
  63                 unsigned stream_idx;
  64                 int64_t input_first_pts;  // The only pts for original frames.
  65
  66                 // For interpolated frames only.
  67                 int64_t input_second_pts;
  68                 float alpha;
  69                 InterpolatedFrameResources resources;
  70                 RefCountedGLsync fence;  // Set when the interpolated image is read back to the CPU.
  71                 GLuint flow_tex, output_tex, cbcr_tex;  // Released in the receiving thread; not really used for anything else.
  72         };
  73         std::deque<QueuedFrame> frame_queue;  // Under <queue_lock>.
  74         std::mutex queue_lock;
  75         std::condition_variable queue_nonempty;
  76
  77         std::unique_ptr<Mux> stream_mux;  // To HTTP.
  78         std::string stream_mux_header;
  79         bool seen_sync_markers = false;
  80
  81         QSurface *gl_surface;
  82
  83         // Effectively only converts from 4:2:2 to 4:4:4.
  84         // TODO: Have a separate version with ResampleEffect, for scaling?
  85         std::unique_ptr<movit::EffectChain> ycbcr_convert_chain;
  86
  87         movit::YCbCrInput *ycbcr_input;
  88         movit::YCbCrFormat ycbcr_format;
  89
  90         // Frame interpolation.
  91         std::unique_ptr<DISComputeFlow> compute_flow;
  92         std::unique_ptr<Interpolate> interpolate;
  93         std::unique_ptr<ChromaSubsampler> chroma_subsampler;
  94 };
  95
  96 #endif  // !defined(_VIDEO_STREAM_H)