git.sesse.net Git - nageru/blob - player.cpp

   1 #include <algorithm>
   2 #include <chrono>
   3 #include <condition_variable>
   4 #include <mutex>
   5 #include <thread>
   6 #include <vector>
   7
   8 #include "clip_list.h"
   9 #include "defs.h"
  10 #include "jpeg_frame_view.h"
  11 #include "player.h"
  12
  13 using namespace std;
  14 using namespace std::chrono;
  15
  16 extern mutex frame_mu;
  17 extern vector<int64_t> frames[MAX_STREAMS];
  18
  19 void Player::thread_func()
  20 {
  21         for ( ;; ) {
  22                 // Wait until we're supposed to play something.
  23                 {
  24                         unique_lock<mutex> lock(cue_state_mu);
  25                         cue_is_playing.wait(lock, [this]{
  26                                 return cue_state == PLAYING;
  27                                 //return current_cue_status.origin != steady_clock::time_point::max();
  28                         });
  29                 }
  30
  31                 Clip clip;
  32                 unsigned stream_idx;
  33                 {
  34                         lock_guard<mutex> lock2(mu);
  35                         clip = current_clip;
  36                         stream_idx = current_stream_idx;
  37                 }
  38                 steady_clock::time_point origin = steady_clock::now();
  39                 int64_t pts_origin = clip.pts_in;
  40
  41                 int64_t next_pts = pts_origin;
  42
  43                 bool eof = false;
  44                 while (!eof) {  // TODO: check for abort
  45                         // FIXME: assumes a given timebase.
  46                         double speed = 0.5;
  47                         steady_clock::time_point next_frame_start =
  48                                 origin + microseconds((next_pts - pts_origin) * int(1000000 / speed) / 12800);
  49                         this_thread::sleep_until(next_frame_start);
  50                         destination->setFrame(stream_idx, next_pts);
  51
  52                         // Find the next frame.
  53                         {
  54                                 lock_guard<mutex> lock2(frame_mu);
  55                                 auto it = upper_bound(frames[stream_idx].begin(),
  56                                         frames[stream_idx].end(),
  57                                         next_pts);
  58                                 if (it == frames[stream_idx].end()) {
  59                                         eof = true;
  60                                 } else {
  61                                         next_pts = *it;
  62                                         if (next_pts >= clip.pts_out) {
  63                                                 eof = true;
  64                                         }
  65                                 }
  66                         }
  67                         if (eof) break;
  68                 }
  69
  70                 // TODO: callback so that the next playlist item can be cued.
  71                 {
  72                         unique_lock<mutex> lock(cue_state_mu);
  73                         cue_state = PAUSED;
  74                 }
  75         }
  76 }
  77
  78 Player::Player(JPEGFrameView *destination)
  79         : destination(destination)
  80 {
  81         thread(&Player::thread_func, this).detach();
  82 }
  83
  84 void Player::play_clip(const Clip &clip, unsigned stream_idx)
  85 {
  86         {
  87                 lock_guard<mutex> lock(mu);
  88                 current_clip = clip;
  89                 current_stream_idx = stream_idx;
  90         }
  91
  92         {
  93                 lock_guard<mutex> lock(cue_state_mu);
  94                 cue_state = PLAYING;
  95                 cue_is_playing.notify_all();
  96         }
  97 }