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 "jpeg_frame_view.h"
  12 #include "ref_counted_gl_sync.h"
  13
  14 #include <condition_variable>
  15 #include <deque>
  16 #include <functional>
  17 #include <movit/effect_chain.h>
  18 #include <movit/mix_effect.h>
  19 #include <movit/ycbcr_input.h>
  20 #include <mutex>
  21 #include <string>
  22 #include <thread>
  23
  24 class ChromaSubsampler;
  25 class DISComputeFlow;
  26 class Interpolate;
  27 class Mux;
  28 class QSurface;
  29 class QSurfaceFormat;
  30 class YCbCrConverter;
  31
  32 class VideoStream {
  33 public:
  34         VideoStream();
  35         ~VideoStream();
  36         void start();
  37         void stop();
  38
  39         // “display_func” is called after the frame has been calculated (if needed)
  40         // and has gone out to the stream.
  41         void schedule_original_frame(int64_t output_pts, std::function<void()> &&display_func, unsigned stream_idx, int64_t input_pts);
  42         void schedule_faded_frame(int64_t output_pts, std::function<void()> &&display_func, unsigned stream_idx, int64_t input_pts, int secondary_stream_idx, int64_t secondary_input_pts, float fade_alpha);
  43         void schedule_interpolated_frame(int64_t output_pts, std::function<void()> &&display_func, unsigned stream_idx, int64_t input_first_pts, int64_t input_second_pts, float alpha, int secondary_stream_idx = -1, int64_t secondary_inputs_pts = -1, float fade_alpha = 0.0f);  // -1 = no secondary frame.
  44         void schedule_refresh_frame(int64_t output_pts, std::function<void()> &&display_func);
  45
  46 private:
  47         void encode_thread_func();
  48         std::thread encode_thread;
  49
  50         static int write_packet2_thunk(void *opaque, uint8_t *buf, int buf_size, AVIODataMarkerType type, int64_t time);
  51         int write_packet2(uint8_t *buf, int buf_size, AVIODataMarkerType type, int64_t time);
  52
  53         // Allocated at the very start; if we're empty, we start dropping frames
  54         // (so that we don't build up an infinite interpolation backlog).
  55         struct InterpolatedFrameResources {
  56                 GLuint input_tex;  // Layered (contains both input frames), Y'CbCr.
  57                 GLuint gray_tex;  // Same, but Y only.
  58                 GLuint input_fbos[2];  // For rendering to the two layers of input_tex.
  59
  60                 // Destination textures and FBO if there is a fade.
  61                 GLuint fade_y_output_tex, fade_cbcr_output_tex;
  62                 GLuint fade_fbo;
  63
  64                 GLuint cb_tex, cr_tex;  // Subsampled, final output.
  65
  66                 GLuint pbo;  // For reading the data back.
  67                 void *pbo_contents;  // Persistently mapped.
  68         };
  69         std::deque<InterpolatedFrameResources> interpolate_resources;  // Under <queue_lock>.
  70         static constexpr size_t num_interpolate_slots = 10;
  71
  72         struct QueuedFrame {
  73                 int64_t output_pts;
  74                 enum Type { ORIGINAL, FADED, INTERPOLATED, FADED_INTERPOLATED, REFRESH } type;
  75                 unsigned stream_idx;
  76                 int64_t input_first_pts;  // The only pts for original frames.
  77
  78                 // For fades only (including fades against interpolated frames).
  79                 int secondary_stream_idx = -1;
  80                 int64_t secondary_input_pts;
  81
  82                 // For interpolated frames only.
  83                 int64_t input_second_pts;
  84                 float alpha;
  85                 InterpolatedFrameResources resources;
  86                 RefCountedGLsync fence;  // Set when the interpolated image is read back to the CPU.
  87                 GLuint flow_tex, output_tex, cbcr_tex;  // Released in the receiving thread; not really used for anything else.
  88                 JPEGID id;
  89
  90                 std::function<void()> display_func;  // Called when the image is done decoding.
  91         };
  92         std::deque<QueuedFrame> frame_queue;  // Under <queue_lock>.
  93         std::mutex queue_lock;
  94         std::condition_variable queue_nonempty;
  95
  96         std::unique_ptr<Mux> stream_mux;  // To HTTP.
  97         std::string stream_mux_header;
  98         bool seen_sync_markers = false;
  99
 100         std::unique_ptr<YCbCrConverter> ycbcr_converter;
 101         std::unique_ptr<YCbCrConverter> ycbcr_semiplanar_converter;
 102
 103         // Frame interpolation.
 104         std::unique_ptr<DISComputeFlow> compute_flow;
 105         std::unique_ptr<Interpolate> interpolate, interpolate_no_split;
 106         std::unique_ptr<ChromaSubsampler> chroma_subsampler;
 107
 108         std::vector<uint8_t> last_frame;
 109 };
 110
 111 #endif  // !defined(_VIDEO_STREAM_H)