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 #include "queue_spot_holder.h"
  14
  15 #include <chrono>
  16 #include <condition_variable>
  17 #include <deque>
  18 #include <functional>
  19 #include <movit/effect_chain.h>
  20 #include <movit/mix_effect.h>
  21 #include <movit/ycbcr_input.h>
  22 #include <mutex>
  23 #include <string>
  24 #include <thread>
  25
  26 class ChromaSubsampler;
  27 class DISComputeFlow;
  28 class Interpolate;
  29 class Mux;
  30 class QSurface;
  31 class QSurfaceFormat;
  32 class YCbCrConverter;
  33
  34 class VideoStream {
  35 public:
  36         VideoStream();
  37         ~VideoStream();
  38         void start();
  39         void stop();
  40         void clear_queue();
  41
  42         // “display_func” is called after the frame has been calculated (if needed)
  43         // and has gone out to the stream.
  44         void schedule_original_frame(std::chrono::steady_clock::time_point,
  45                                      int64_t output_pts, std::function<void()> &&display_func,
  46                                      QueueSpotHolder &&queue_spot_holder,
  47                                      unsigned stream_idx, int64_t input_pts);
  48         void schedule_faded_frame(std::chrono::steady_clock::time_point, int64_t output_pts,
  49                                   std::function<void()> &&display_func,
  50                                   QueueSpotHolder &&queue_spot_holder,
  51                                   unsigned stream_idx, int64_t input_pts, int secondary_stream_idx,
  52                                   int64_t secondary_input_pts, float fade_alpha);
  53         void schedule_interpolated_frame(std::chrono::steady_clock::time_point, int64_t output_pts,
  54                                   std::function<void(std::shared_ptr<Frame>)> &&display_func,
  55                                   QueueSpotHolder &&queue_spot_holder,
  56                                   unsigned stream_idx, int64_t input_first_pts, int64_t input_second_pts,
  57                                   float alpha, int secondary_stream_idx = -1, int64_t secondary_inputs_pts = -1,
  58                                   float fade_alpha = 0.0f);  // -1 = no secondary frame.
  59         void schedule_refresh_frame(std::chrono::steady_clock::time_point, int64_t output_pts,
  60                                     std::function<void()> &&display_func,
  61                                     QueueSpotHolder &&queue_spot_holder);
  62
  63 private:
  64         void encode_thread_func();
  65         std::thread encode_thread;
  66
  67         static int write_packet2_thunk(void *opaque, uint8_t *buf, int buf_size, AVIODataMarkerType type, int64_t time);
  68         int write_packet2(uint8_t *buf, int buf_size, AVIODataMarkerType type, int64_t time);
  69
  70         // Allocated at the very start; if we're empty, we start dropping frames
  71         // (so that we don't build up an infinite interpolation backlog).
  72         struct InterpolatedFrameResources {
  73                 VideoStream *owner;  // Used only for IFRReleaser, below.
  74
  75                 GLuint input_tex;  // Layered (contains both input frames), Y'CbCr.
  76                 GLuint gray_tex;  // Same, but Y only.
  77                 GLuint input_fbos[2];  // For rendering to the two layers of input_tex.
  78
  79                 // Destination textures and FBO if there is a fade.
  80                 GLuint fade_y_output_tex, fade_cbcr_output_tex;
  81                 GLuint fade_fbo;
  82
  83                 GLuint cb_tex, cr_tex;  // Subsampled, final output.
  84
  85                 GLuint pbo;  // For reading the data back.
  86                 void *pbo_contents;  // Persistently mapped.
  87         };
  88         std::mutex queue_lock;
  89         std::deque<std::unique_ptr<InterpolatedFrameResources>> interpolate_resources;  // Under <queue_lock>.
  90         static constexpr size_t num_interpolate_slots = 15;  // Should be larger than Player::max_queued_frames, or we risk mass-dropping frames.
  91
  92         struct IFRReleaser {
  93                 void operator() (InterpolatedFrameResources *ifr) const
  94                 {
  95                         if (ifr != nullptr) {
  96                                 std::unique_lock<std::mutex> lock(ifr->owner->queue_lock);
  97                                 ifr->owner->interpolate_resources.emplace_back(ifr);
  98                         }
  99                 }
 100         };
 101         using BorrowedInterpolatedFrameResources = std::unique_ptr<InterpolatedFrameResources, IFRReleaser>;
 102
 103         struct QueuedFrame {
 104                 std::chrono::steady_clock::time_point local_pts;
 105
 106                 int64_t output_pts;
 107                 enum Type { ORIGINAL, FADED, INTERPOLATED, FADED_INTERPOLATED, REFRESH } type;
 108                 unsigned stream_idx;
 109                 int64_t input_first_pts;  // The only pts for original frames.
 110
 111                 // For fades only (including fades against interpolated frames).
 112                 int secondary_stream_idx = -1;
 113                 int64_t secondary_input_pts;
 114
 115                 // For interpolated frames only.
 116                 int64_t input_second_pts;
 117                 float alpha;
 118                 BorrowedInterpolatedFrameResources resources;
 119                 RefCountedGLsync fence;  // Set when the interpolated image is read back to the CPU.
 120                 GLuint flow_tex, output_tex, cbcr_tex;  // Released in the receiving thread; not really used for anything else.
 121                 JPEGID id;
 122
 123                 std::function<void()> display_func;  // Called when the image is done decoding.
 124                 std::function<void(std::shared_ptr<Frame>)> display_decoded_func;  // Same, except for INTERPOLATED and FADED_INTERPOLATED.
 125
 126                 QueueSpotHolder queue_spot_holder;
 127         };
 128         std::deque<QueuedFrame> frame_queue;  // Under <queue_lock>.
 129         std::condition_variable queue_changed;
 130
 131         std::unique_ptr<Mux> stream_mux;  // To HTTP.
 132         std::string stream_mux_header;
 133         bool seen_sync_markers = false;
 134
 135         std::unique_ptr<YCbCrConverter> ycbcr_converter;
 136         std::unique_ptr<YCbCrConverter> ycbcr_semiplanar_converter;
 137
 138         // Frame interpolation.
 139         std::unique_ptr<DISComputeFlow> compute_flow;
 140         std::unique_ptr<Interpolate> interpolate, interpolate_no_split;
 141         std::unique_ptr<ChromaSubsampler> chroma_subsampler;
 142
 143         std::vector<uint8_t> last_frame;
 144 };
 145
 146 #endif  // !defined(_VIDEO_STREAM_H)