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

   1 #include "player.h"
   2
   3 #include "clip_list.h"
   4 #include "context.h"
   5 #include "defs.h"
   6 #include "ffmpeg_raii.h"
   7 #include "httpd.h"
   8 #include "jpeg_frame_view.h"
   9 #include "mux.h"
  10 #include "timebase.h"
  11 #include "video_stream.h"
  12
  13 #include <algorithm>
  14 #include <chrono>
  15 #include <condition_variable>
  16 #include <movit/util.h>
  17 #include <mutex>
  18 #include <stdio.h>
  19 #include <thread>
  20 #include <vector>
  21
  22 using namespace std;
  23 using namespace std::chrono;
  24
  25 extern mutex frame_mu;
  26 extern vector<int64_t> frames[MAX_STREAMS];
  27 extern HTTPD *global_httpd;
  28
  29 void Player::thread_func(bool also_output_to_stream)
  30 {
  31         pthread_setname_np(pthread_self(), "Player");
  32
  33         QSurface *surface = create_surface();
  34         QOpenGLContext *context = create_context(surface);
  35         if (!make_current(context, surface)) {
  36                 printf("oops\n");
  37                 exit(1);
  38         }
  39
  40         check_error();
  41
  42         // Create the VideoStream object, now that we have an OpenGL context.
  43         if (also_output_to_stream) {
  44                 video_stream.reset(new VideoStream);
  45                 video_stream->start();
  46         }
  47
  48         check_error();
  49
  50         constexpr double output_framerate = 60000.0 / 1001.0;  // FIXME: make configurable
  51         int64_t pts = 0;
  52         Clip next_clip;
  53         bool got_next_clip = false;
  54         double next_clip_fade_time = -1.0;
  55
  56         for ( ;; ) {
  57                 bool clip_ready;
  58                 steady_clock::time_point before_sleep = steady_clock::now();
  59
  60                 // Wait until we're supposed to play something.
  61                 {
  62                         unique_lock<mutex> lock(queue_state_mu);
  63                         clip_ready = new_clip_changed.wait_for(lock, milliseconds(100), [this] {
  64                                 return new_clip_ready && current_clip.pts_in != -1;
  65                         });
  66                         new_clip_ready = false;
  67                         playing = true;
  68                 }
  69
  70                 steady_clock::duration time_slept = steady_clock::now() - before_sleep;
  71                 pts += duration_cast<duration<size_t, TimebaseRatio>>(time_slept).count();
  72
  73                 if (!clip_ready) {
  74                         if (video_stream != nullptr) {
  75                                 video_stream->schedule_refresh_frame(pts);
  76                         }
  77                         continue;
  78                 }
  79
  80                 Clip clip;
  81                 unsigned stream_idx;
  82                 {
  83                         lock_guard<mutex> lock(mu);
  84                         clip = current_clip;
  85                         stream_idx = current_stream_idx;
  86                 }
  87                 steady_clock::time_point origin = steady_clock::now();
  88                 int64_t in_pts_origin = clip.pts_in;
  89 got_clip:
  90                 int64_t out_pts_origin = pts;
  91
  92                 // Start playing exactly at a frame.
  93                 // TODO: Snap secondary (fade-to) clips in the same fashion
  94                 // so that we don't get jank here).
  95                 {
  96                         lock_guard<mutex> lock(frame_mu);
  97
  98                         // Find the first frame such that frame.pts <= in_pts.
  99                         auto it = lower_bound(frames[stream_idx].begin(),
 100                                 frames[stream_idx].end(),
 101                                 in_pts_origin);
 102                         if (it != frames[stream_idx].end()) {
 103                                 in_pts_origin = *it;
 104                         }
 105                 }
 106
 107                 // TODO: Lock to a rational multiple of the frame rate if possible.
 108                 double speed = 0.5;
 109
 110                 int64_t in_pts_start_next_clip = -1;
 111                 for (int frameno = 0; ; ++frameno) {  // Ends when the clip ends.
 112                         double out_pts = out_pts_origin + TIMEBASE * frameno / output_framerate;
 113                         steady_clock::time_point next_frame_start =
 114                                 origin + microseconds(lrint((out_pts - out_pts_origin) * 1e6 / TIMEBASE));
 115                         int64_t in_pts = lrint(in_pts_origin + TIMEBASE * frameno * speed / output_framerate);
 116                         pts = lrint(out_pts);
 117
 118                         steady_clock::duration time_behind = steady_clock::now() - next_frame_start;
 119                         if (time_behind >= milliseconds(200)) {
 120                                 fprintf(stderr, "WARNING: %ld ms behind, dropping a frame (no matter the type).\n",
 121                                         lrint(1e3 * duration<double>(time_behind).count()));
 122                                 continue;
 123                         }
 124
 125                         double time_left_this_clip = double(clip.pts_out - in_pts) / TIMEBASE / speed;
 126                         if (!got_next_clip && next_clip_callback != nullptr && time_left_this_clip <= clip.fade_time_seconds) {
 127                                 // Find the next clip so that we can begin a fade.
 128                                 next_clip = next_clip_callback();
 129                                 if (next_clip.pts_in != -1) {
 130                                         got_next_clip = true;
 131
 132                                         double duration_next_clip = (next_clip.pts_out - next_clip.pts_in) / TIMEBASE / speed;
 133                                         next_clip_fade_time = std::min(time_left_this_clip, duration_next_clip);
 134                                         in_pts_start_next_clip = next_clip.pts_in + lrint(next_clip_fade_time * TIMEBASE * speed);
 135                                 }
 136                         }
 137
 138                         int primary_stream_idx = stream_idx;
 139                         int secondary_stream_idx = -1;
 140                         float fade_alpha = 0.0f;
 141                         if (got_next_clip) {
 142                                 secondary_stream_idx = next_clip.stream_idx;
 143                                 fade_alpha = 1.0f - time_left_this_clip / next_clip_fade_time;
 144
 145                                 // If more than half-way through the fade, interpolate the next clip
 146                                 // instead of the current one, since it's more visible.
 147                                 if (fade_alpha >= 0.5f) {
 148                                         swap(primary_stream_idx, secondary_stream_idx);
 149                                         fade_alpha = 1.0f - fade_alpha;
 150                                 }
 151                         }
 152
 153                         int64_t secondary_pts = -1;
 154                         if (got_next_clip) {
 155                                 int64_t in_pts_secondary = lrint(next_clip.pts_in + TIMEBASE * frameno * speed / output_framerate);
 156                                 int64_t in_pts_lower, in_pts_upper;
 157                                 bool ok = find_surrounding_frames(in_pts_secondary, secondary_stream_idx, &in_pts_lower, &in_pts_upper);
 158                                 if (ok) {
 159                                         secondary_pts = in_pts_lower;
 160                                 } else {
 161                                         secondary_stream_idx = -1;
 162                                 }
 163                         }
 164
 165                         if (progress_callback != nullptr) {
 166                                 // NOTE: None of this will take into account any snapping done below.
 167                                 double played_this_clip = double(in_pts - clip.pts_in) / TIMEBASE / speed;
 168                                 double total_length = double(clip.pts_out - clip.pts_in) / TIMEBASE / speed;
 169                                 progress_callback(played_this_clip, total_length);
 170                         }
 171
 172                         int64_t in_pts_lower, in_pts_upper;
 173                         bool ok = find_surrounding_frames(in_pts, primary_stream_idx, &in_pts_lower, &in_pts_upper);
 174                         if (!ok || in_pts_upper >= clip.pts_out) {
 175                                 break;
 176                         }
 177
 178                         // Sleep until the next frame start, or until there's a new clip we're supposed to play.
 179                         {
 180                                 unique_lock<mutex> lock(queue_state_mu);
 181                                 new_clip_changed.wait_until(lock, next_frame_start, [this]{
 182                                         return new_clip_ready || override_stream_idx != -1;
 183                                 });
 184                                 if (new_clip_ready) break;
 185                                 if (override_stream_idx != -1) {
 186                                         stream_idx = override_stream_idx;
 187                                         override_stream_idx = -1;
 188                                         continue;
 189                                 }
 190                         }
 191
 192                         if (in_pts_lower == in_pts_upper) {
 193                                 destination->setFrame(primary_stream_idx, in_pts_lower, /*interpolated=*/false, secondary_stream_idx, secondary_pts, fade_alpha);
 194                                 if (video_stream != nullptr) {
 195                                         if (secondary_stream_idx == -1) {
 196                                                 video_stream->schedule_original_frame(pts, primary_stream_idx, in_pts_lower);
 197                                         } else {
 198                                                 video_stream->schedule_faded_frame(pts, primary_stream_idx, in_pts_lower, secondary_stream_idx, secondary_pts, fade_alpha);
 199                                         }
 200                                 }
 201                                 continue;
 202                         }
 203
 204                         // Snap to input frame: If we can do so with less than 1% jitter
 205                         // (ie., move less than 1% of an _output_ frame), do so.
 206                         // TODO: Snap secondary (fade-to) clips in the same fashion.
 207                         bool snapped = false;
 208                         for (int64_t snap_pts : { in_pts_lower, in_pts_upper }) {
 209                                 double snap_pts_as_frameno = (snap_pts - in_pts_origin) * output_framerate / TIMEBASE / speed;
 210                                 if (fabs(snap_pts_as_frameno - frameno) < 0.01) {
 211                                         destination->setFrame(primary_stream_idx, snap_pts, /*interpolated=*/false, secondary_stream_idx, secondary_pts, fade_alpha);
 212                                         if (video_stream != nullptr) {
 213                                                 if (secondary_stream_idx == -1) {
 214                                                         video_stream->schedule_original_frame(pts, primary_stream_idx, snap_pts);
 215                                                 } else {
 216                                                         video_stream->schedule_faded_frame(pts, primary_stream_idx, snap_pts, secondary_stream_idx, secondary_pts, fade_alpha);
 217                                                 }
 218                                         }
 219                                         in_pts_origin += snap_pts - in_pts;
 220                                         snapped = true;
 221                                         break;
 222                                 }
 223                         }
 224                         if (snapped) {
 225                                 continue;
 226                         }
 227
 228                         if (time_behind >= milliseconds(100)) {
 229                                 fprintf(stderr, "WARNING: %ld ms behind, dropping an interpolated frame.\n",
 230                                         lrint(1e3 * duration<double>(time_behind).count()));
 231                                 continue;
 232                         }
 233
 234                         double alpha = double(in_pts - in_pts_lower) / (in_pts_upper - in_pts_lower);
 235
 236                         if (video_stream == nullptr) {
 237                                 // Previews don't do any interpolation.
 238                                 assert(secondary_stream_idx == -1);
 239                                 destination->setFrame(primary_stream_idx, in_pts_lower, /*interpolated=*/false);
 240                         } else {
 241                                 // Calculate the interpolated frame. When it's done, the destination
 242                                 // will be unblocked.
 243                                 destination->setFrame(primary_stream_idx, pts, /*interpolated=*/true, secondary_stream_idx, secondary_pts, fade_alpha);
 244                                 video_stream->schedule_interpolated_frame(pts, primary_stream_idx, in_pts_lower, in_pts_upper, alpha, secondary_stream_idx, secondary_pts, fade_alpha);
 245                         }
 246                 }
 247
 248                 // The clip ended.
 249
 250                 // Last-ditch effort to get the next clip (if e.g. the fade time was zero seconds).
 251                 if (!got_next_clip && next_clip_callback != nullptr) {
 252                         next_clip = next_clip_callback();
 253                         if (next_clip.pts_in != -1) {
 254                                 got_next_clip = true;
 255                                 in_pts_start_next_clip = next_clip.pts_in;
 256                         }
 257                 }
 258
 259                 // Switch to next clip if we got it.
 260                 if (got_next_clip) {
 261                         clip = next_clip;
 262                         stream_idx = next_clip.stream_idx;  // Override is used for previews only, and next_clip is used for live ony.
 263                         if (done_callback != nullptr) {
 264                                 done_callback();
 265                         }
 266                         got_next_clip = false;
 267
 268                         // Start the next clip from the point where the fade went out.
 269                         origin = steady_clock::now();
 270                         in_pts_origin = in_pts_start_next_clip;
 271                         goto got_clip;
 272                 }
 273
 274                 {
 275                         unique_lock<mutex> lock(queue_state_mu);
 276                         playing = false;
 277                 }
 278                 if (done_callback != nullptr) {
 279                         done_callback();
 280                 }
 281         }
 282 }
 283
 284 // Find the frame immediately before and after this point.
 285 bool Player::find_surrounding_frames(int64_t pts, int stream_idx, int64_t *pts_lower, int64_t *pts_upper)
 286 {
 287         lock_guard<mutex> lock(frame_mu);
 288
 289         // Find the first frame such that frame.pts >= pts.
 290         auto it = lower_bound(frames[stream_idx].begin(),
 291                 frames[stream_idx].end(),
 292                 pts);
 293         if (it == frames[stream_idx].end()) {
 294                 return false;
 295         }
 296         *pts_upper = *it;
 297
 298         // Find the last frame such that in_pts <= frame.pts (if any).
 299         if (it == frames[stream_idx].begin()) {
 300                 *pts_lower = *it;
 301         } else {
 302                 *pts_lower = *(it - 1);
 303         }
 304         assert(pts >= *pts_lower);
 305         assert(pts <= *pts_upper);
 306         return true;
 307 }
 308
 309 Player::Player(JPEGFrameView *destination, bool also_output_to_stream)
 310         : destination(destination)
 311 {
 312         thread(&Player::thread_func, this, also_output_to_stream).detach();
 313 }
 314
 315 void Player::play_clip(const Clip &clip, unsigned stream_idx)
 316 {
 317         {
 318                 lock_guard<mutex> lock(mu);
 319                 current_clip = clip;
 320                 current_stream_idx = stream_idx;
 321         }
 322
 323         {
 324                 lock_guard<mutex> lock(queue_state_mu);
 325                 new_clip_ready = true;
 326                 override_stream_idx = -1;
 327                 new_clip_changed.notify_all();
 328         }
 329 }
 330
 331 void Player::override_angle(unsigned stream_idx)
 332 {
 333         // Corner case: If a new clip is waiting to be played, change its stream and then we're done.
 334         {
 335                 unique_lock<mutex> lock(queue_state_mu);
 336                 if (new_clip_ready) {
 337                         lock_guard<mutex> lock2(mu);
 338                         current_stream_idx = stream_idx;
 339                         return;
 340                 }
 341         }
 342
 343         // If we are playing a clip, set override_stream_idx, and the player thread will
 344         // pick it up and change its internal index.
 345         {
 346                 unique_lock<mutex> lock(queue_state_mu);
 347                 if (playing) {
 348                         override_stream_idx = stream_idx;
 349                         new_clip_changed.notify_all();
 350                 }
 351         }
 352
 353         // OK, so we're standing still, presumably at the end of a clip.
 354         // Look at the current pts_out (if it exists), and show the closest
 355         // thing we've got.
 356         int64_t pts_out;
 357         {
 358                 lock_guard<mutex> lock(mu);
 359                 if (current_clip.pts_out < 0) {
 360                         return;
 361                 }
 362                 pts_out = current_clip.pts_out;
 363         }
 364
 365         lock_guard<mutex> lock(frame_mu);
 366         auto it = upper_bound(frames[stream_idx].begin(), frames[stream_idx].end(), pts_out);
 367         if (it == frames[stream_idx].end()) {
 368                 return;
 369         }
 370         destination->setFrame(stream_idx, *it, /*interpolated=*/false);
 371 }