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

   1 #include "player.h"
   2
   3 #include "clip_list.h"
   4 #include "shared/context.h"
   5 #include "defs.h"
   6 #include "shared/ffmpeg_raii.h"
   7 #include "flags.h"
   8 #include "frame_on_disk.h"
   9 #include "shared/httpd.h"
  10 #include "jpeg_frame_view.h"
  11 #include "shared/mux.h"
  12 #include "shared/timebase.h"
  13 #include "video_stream.h"
  14
  15 #include <algorithm>
  16 #include <chrono>
  17 #include <condition_variable>
  18 #include <movit/util.h>
  19 #include <mutex>
  20 #include <stdio.h>
  21 #include <thread>
  22 #include <vector>
  23
  24 using namespace std;
  25 using namespace std::chrono;
  26
  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         size_t next_clip_idx = size_t(-1);
  54         bool got_next_clip = false;
  55         double next_clip_fade_time = -1.0;
  56
  57         while (!should_quit) {
  58 wait_for_clip:
  59                 bool clip_ready;
  60                 steady_clock::time_point before_sleep = steady_clock::now();
  61
  62                 // Wait until we're supposed to play something.
  63                 {
  64                         unique_lock<mutex> lock(queue_state_mu);
  65                         clip_ready = new_clip_changed.wait_for(lock, milliseconds(100), [this] {
  66                                 return should_quit || (new_clip_ready && current_clip.pts_in != -1);
  67                         });
  68                         if (should_quit) {
  69                                 return;
  70                         }
  71                         new_clip_ready = false;
  72                         playing = true;
  73                 }
  74
  75                 steady_clock::duration time_slept = steady_clock::now() - before_sleep;
  76                 pts += duration_cast<duration<size_t, TimebaseRatio>>(time_slept).count();
  77
  78                 if (!clip_ready) {
  79                         if (video_stream != nullptr) {
  80                                 video_stream->schedule_refresh_frame(steady_clock::now(), pts, /*display_func=*/nullptr, QueueSpotHolder());
  81                         }
  82                         continue;
  83                 }
  84
  85                 Clip clip;
  86                 size_t clip_idx;
  87                 unsigned stream_idx;
  88                 {
  89                         lock_guard<mutex> lock(mu);
  90                         clip = current_clip;
  91                         clip_idx = current_clip_idx;
  92                         stream_idx = current_stream_idx;
  93                 }
  94                 steady_clock::time_point origin = steady_clock::now();  // TODO: Add a 100 ms buffer for ramp-up?
  95                 int64_t in_pts_origin = clip.pts_in;
  96 got_clip:
  97                 int64_t out_pts_origin = pts;
  98
  99                 // Start playing exactly at a frame.
 100                 // TODO: Snap secondary (fade-to) clips in the same fashion
 101                 // so that we don't get jank here).
 102                 {
 103                         lock_guard<mutex> lock(frame_mu);
 104
 105                         // Find the first frame such that frame.pts <= in_pts.
 106                         auto it = lower_bound(frames[stream_idx].begin(),
 107                                 frames[stream_idx].end(),
 108                                 in_pts_origin,
 109                                 [](const FrameOnDisk &frame, int64_t pts) { return frame.pts < pts; });
 110                         if (it != frames[stream_idx].end()) {
 111                                 in_pts_origin = it->pts;
 112                         }
 113                 }
 114
 115                 // TODO: Lock to a rational multiple of the frame rate if possible.
 116                 double speed = 0.5;
 117
 118                 int64_t in_pts_start_next_clip = -1;
 119                 steady_clock::time_point next_frame_start;
 120                 for (int frameno = 0; !should_quit; ++frameno) {  // Ends when the clip ends.
 121                         double out_pts = out_pts_origin + TIMEBASE * frameno / output_framerate;
 122                         next_frame_start =
 123                                 origin + microseconds(lrint((out_pts - out_pts_origin) * 1e6 / TIMEBASE));
 124                         int64_t in_pts = lrint(in_pts_origin + TIMEBASE * frameno * speed / output_framerate);
 125                         pts = lrint(out_pts);
 126
 127                         if (in_pts >= clip.pts_out) {
 128                                 break;
 129                         }
 130
 131                         steady_clock::duration time_behind = steady_clock::now() - next_frame_start;
 132                         if (time_behind >= milliseconds(200)) {
 133                                 fprintf(stderr, "WARNING: %ld ms behind, dropping a frame (no matter the type).\n",
 134                                         lrint(1e3 * duration<double>(time_behind).count()));
 135                                 continue;
 136                         }
 137
 138                         double time_left_this_clip = double(clip.pts_out - in_pts) / TIMEBASE / speed;
 139                         if (!got_next_clip && next_clip_callback != nullptr && time_left_this_clip <= clip.fade_time_seconds) {
 140                                 // Find the next clip so that we can begin a fade.
 141                                 tie(next_clip, next_clip_idx) = next_clip_callback();
 142                                 if (next_clip.pts_in != -1) {
 143                                         got_next_clip = true;
 144
 145                                         double duration_next_clip = (next_clip.pts_out - next_clip.pts_in) / TIMEBASE / speed;
 146                                         next_clip_fade_time = std::min(time_left_this_clip, duration_next_clip);
 147                                         in_pts_start_next_clip = next_clip.pts_in + lrint(next_clip_fade_time * TIMEBASE * speed);
 148                                 }
 149                         }
 150
 151                         // pts not affected by the swapping below.
 152                         int64_t in_pts_for_progress = in_pts, in_pts_secondary_for_progress = -1;
 153
 154                         int primary_stream_idx = stream_idx;
 155                         FrameOnDisk secondary_frame;
 156                         int secondary_stream_idx = -1;
 157                         float fade_alpha = 0.0f;
 158                         if (got_next_clip && time_left_this_clip <= next_clip_fade_time) {
 159                                 secondary_stream_idx = next_clip.stream_idx;
 160                                 int64_t in_pts_secondary = lrint(next_clip.pts_in + (next_clip_fade_time - time_left_this_clip) * TIMEBASE * speed);
 161                                 in_pts_secondary_for_progress = in_pts_secondary;
 162                                 fade_alpha = 1.0f - time_left_this_clip / next_clip_fade_time;
 163
 164                                 // If more than half-way through the fade, interpolate the next clip
 165                                 // instead of the current one, since it's more visible.
 166                                 if (fade_alpha >= 0.5f) {
 167                                         swap(primary_stream_idx, secondary_stream_idx);
 168                                         swap(in_pts, in_pts_secondary);
 169                                         fade_alpha = 1.0f - fade_alpha;
 170                                 }
 171
 172                                 FrameOnDisk frame_lower, frame_upper;
 173                                 bool ok = find_surrounding_frames(in_pts_secondary, secondary_stream_idx, &frame_lower, &frame_upper);
 174                                 if (ok) {
 175                                         secondary_frame = frame_lower;
 176                                 }
 177                         }
 178
 179                         if (progress_callback != nullptr) {
 180                                 // NOTE: None of this will take into account any snapping done below.
 181                                 double played_this_clip = double(in_pts_for_progress - clip.pts_in) / TIMEBASE / speed;
 182                                 double total_length = double(clip.pts_out - clip.pts_in) / TIMEBASE / speed;
 183                                 map<size_t, double> progress{{ clip_idx, played_this_clip / total_length }};
 184
 185                                 if (got_next_clip && time_left_this_clip <= next_clip_fade_time) {
 186                                         double played_next_clip = double(in_pts_secondary_for_progress - next_clip.pts_in) / TIMEBASE / speed;
 187                                         double total_next_length = double(next_clip.pts_out - next_clip.pts_in) / TIMEBASE / speed;
 188                                         progress[next_clip_idx] = played_next_clip / total_next_length;
 189                                 }
 190                                 progress_callback(progress);
 191                         }
 192
 193                         FrameOnDisk frame_lower, frame_upper;
 194                         bool ok = find_surrounding_frames(in_pts, primary_stream_idx, &frame_lower, &frame_upper);
 195                         if (!ok) {
 196                                 break;
 197                         }
 198
 199                         {
 200                                 unique_lock<mutex> lock(queue_state_mu);
 201                                 if (video_stream == nullptr) {
 202                                         // No queue, just wait until the right time and then show the frame.
 203                                         new_clip_changed.wait_until(lock, next_frame_start, [this]{
 204                                                 return should_quit || new_clip_ready || override_stream_idx != -1;
 205                                         });
 206                                 if (should_quit) {
 207                                         return;
 208                                 }
 209                                 } else {
 210                                         // If the queue is full (which is really the state we'd like to be in),
 211                                         // wait until there's room for one more frame (ie., one was output from
 212                                         // VideoStream), or until or until there's a new clip we're supposed to play.
 213                                         //
 214                                         // In this case, we don't sleep until next_frame_start; the displaying is
 215                                         // done by the queue.
 216                                         new_clip_changed.wait(lock, [this]{
 217                                                 if (num_queued_frames < max_queued_frames) {
 218                                                         return true;
 219                                                 }
 220                                                 return should_quit || new_clip_ready || override_stream_idx != -1;
 221                                         });
 222                                 }
 223                                 if (should_quit) {
 224                                         return;
 225                                 }
 226                                 if (new_clip_ready) {
 227                                         if (video_stream != nullptr) {
 228                                                 lock.unlock();  // Urg.
 229                                                 video_stream->clear_queue();
 230                                                 lock.lock();
 231                                         }
 232                                         got_next_clip = false;
 233                                         goto wait_for_clip;
 234                                 }
 235                                 if (override_stream_idx != -1) {
 236                                         stream_idx = override_stream_idx;
 237                                         override_stream_idx = -1;
 238                                         continue;
 239                                 }
 240                         }
 241
 242                         if (frame_lower.pts == frame_upper.pts || global_flags.interpolation_quality == 0) {
 243                                 auto display_func = [this, primary_stream_idx, frame_lower, secondary_frame, fade_alpha]{
 244                                         destination->setFrame(primary_stream_idx, frame_lower, secondary_frame, fade_alpha);
 245                                 };
 246                                 if (video_stream == nullptr) {
 247                                         display_func();
 248                                 } else {
 249                                         if (secondary_stream_idx == -1) {
 250                                                 video_stream->schedule_original_frame(
 251                                                         next_frame_start, pts, display_func, QueueSpotHolder(this),
 252                                                         frame_lower);
 253                                         } else {
 254                                                 assert(secondary_frame.pts != -1);
 255                                                 video_stream->schedule_faded_frame(next_frame_start, pts, display_func,
 256                                                         QueueSpotHolder(this), frame_lower,
 257                                                         secondary_frame, fade_alpha);
 258                                         }
 259                                 }
 260                                 continue;
 261                         }
 262
 263                         // Snap to input frame: If we can do so with less than 1% jitter
 264                         // (ie., move less than 1% of an _output_ frame), do so.
 265                         // TODO: Snap secondary (fade-to) clips in the same fashion.
 266                         bool snapped = false;
 267                         for (FrameOnDisk snap_frame : { frame_lower, frame_upper }) {
 268                                 double snap_pts_as_frameno = (snap_frame.pts - in_pts_origin) * output_framerate / TIMEBASE / speed;
 269                                 if (fabs(snap_pts_as_frameno - frameno) < 0.01) {
 270                                         auto display_func = [this, primary_stream_idx, snap_frame, secondary_frame, fade_alpha]{
 271                                                 destination->setFrame(primary_stream_idx, snap_frame, secondary_frame, fade_alpha);
 272                                         };
 273                                         if (video_stream == nullptr) {
 274                                                 display_func();
 275                                         } else {
 276                                                 if (secondary_stream_idx == -1) {
 277                                                         video_stream->schedule_original_frame(
 278                                                                 next_frame_start, pts, display_func,
 279                                                                 QueueSpotHolder(this), snap_frame);
 280                                                 } else {
 281                                                         assert(secondary_frame.pts != -1);
 282                                                         video_stream->schedule_faded_frame(
 283                                                                 next_frame_start, pts, display_func, QueueSpotHolder(this),
 284                                                                 snap_frame, secondary_frame, fade_alpha);
 285                                                 }
 286                                         }
 287                                         in_pts_origin += snap_frame.pts - in_pts;
 288                                         snapped = true;
 289                                         break;
 290                                 }
 291                         }
 292                         if (snapped) {
 293                                 continue;
 294                         }
 295
 296                         if (time_behind >= milliseconds(100)) {
 297                                 fprintf(stderr, "WARNING: %ld ms behind, dropping an interpolated frame.\n",
 298                                         lrint(1e3 * duration<double>(time_behind).count()));
 299                                 continue;
 300                         }
 301
 302                         double alpha = double(in_pts - frame_lower.pts) / (frame_upper.pts - frame_lower.pts);
 303
 304                         if (video_stream == nullptr) {
 305                                 // Previews don't do any interpolation.
 306                                 assert(secondary_stream_idx == -1);
 307                                 destination->setFrame(primary_stream_idx, frame_lower);
 308                         } else {
 309                                 auto display_func = [this](shared_ptr<Frame> frame) {
 310                                         destination->setFrame(frame);
 311                                 };
 312                                 video_stream->schedule_interpolated_frame(
 313                                         next_frame_start, pts, display_func, QueueSpotHolder(this),
 314                                         frame_lower, frame_upper, alpha,
 315                                         secondary_frame, fade_alpha);
 316                         }
 317                 }
 318
 319                 if (should_quit) {
 320                         return;
 321                 }
 322
 323                 // The clip ended.
 324
 325                 // Last-ditch effort to get the next clip (if e.g. the fade time was zero seconds).
 326                 if (!got_next_clip && next_clip_callback != nullptr) {
 327                         tie(next_clip, next_clip_idx) = next_clip_callback();
 328                         if (next_clip.pts_in != -1) {
 329                                 got_next_clip = true;
 330                                 in_pts_start_next_clip = next_clip.pts_in;
 331                         }
 332                 }
 333
 334                 // Switch to next clip if we got it.
 335                 if (got_next_clip) {
 336                         clip = next_clip;
 337                         clip_idx = next_clip_idx;
 338                         stream_idx = next_clip.stream_idx;  // Override is used for previews only, and next_clip is used for live ony.
 339                         if (done_callback != nullptr) {
 340                                 done_callback();
 341                         }
 342                         got_next_clip = false;
 343
 344                         // Start the next clip from the point where the fade went out.
 345                         origin = next_frame_start;
 346                         in_pts_origin = in_pts_start_next_clip;
 347                         goto got_clip;
 348                 }
 349
 350                 {
 351                         unique_lock<mutex> lock(queue_state_mu);
 352                         playing = false;
 353                 }
 354                 if (done_callback != nullptr) {
 355                         done_callback();
 356                 }
 357         }
 358 }
 359
 360 // Find the frame immediately before and after this point.
 361 bool Player::find_surrounding_frames(int64_t pts, int stream_idx, FrameOnDisk *frame_lower, FrameOnDisk *frame_upper)
 362 {
 363         lock_guard<mutex> lock(frame_mu);
 364
 365         // Find the first frame such that frame.pts >= pts.
 366         auto it = lower_bound(frames[stream_idx].begin(),
 367                 frames[stream_idx].end(),
 368                 pts,
 369                 [](const FrameOnDisk &frame, int64_t pts) { return frame.pts < pts; });
 370         if (it == frames[stream_idx].end()) {
 371                 return false;
 372         }
 373         *frame_upper = *it;
 374
 375         // Find the last frame such that in_pts <= frame.pts (if any).
 376         if (it == frames[stream_idx].begin()) {
 377                 *frame_lower = *it;
 378         } else {
 379                 *frame_lower = *(it - 1);
 380         }
 381         assert(pts >= frame_lower->pts);
 382         assert(pts <= frame_upper->pts);
 383         return true;
 384 }
 385
 386 Player::Player(JPEGFrameView *destination, bool also_output_to_stream)
 387         : destination(destination)
 388 {
 389         player_thread = thread(&Player::thread_func, this, also_output_to_stream);
 390 }
 391
 392 Player::~Player()
 393 {
 394         should_quit = true;
 395         if (video_stream != nullptr) {
 396                 video_stream->stop();
 397         }
 398         new_clip_changed.notify_all();
 399         player_thread.join();
 400 }
 401
 402 void Player::play_clip(const Clip &clip, size_t clip_idx, unsigned stream_idx)
 403 {
 404         {
 405                 lock_guard<mutex> lock(mu);
 406                 current_clip = clip;
 407                 current_stream_idx = stream_idx;
 408                 current_clip_idx = clip_idx;
 409         }
 410
 411         {
 412                 lock_guard<mutex> lock(queue_state_mu);
 413                 new_clip_ready = true;
 414                 override_stream_idx = -1;
 415                 new_clip_changed.notify_all();
 416         }
 417 }
 418
 419 void Player::override_angle(unsigned stream_idx)
 420 {
 421         // Corner case: If a new clip is waiting to be played, change its stream and then we're done.
 422         {
 423                 unique_lock<mutex> lock(queue_state_mu);
 424                 if (new_clip_ready) {
 425                         lock_guard<mutex> lock2(mu);
 426                         current_stream_idx = stream_idx;
 427                         return;
 428                 }
 429         }
 430
 431         // If we are playing a clip, set override_stream_idx, and the player thread will
 432         // pick it up and change its internal index.
 433         {
 434                 unique_lock<mutex> lock(queue_state_mu);
 435                 if (playing) {
 436                         override_stream_idx = stream_idx;
 437                         new_clip_changed.notify_all();
 438                 }
 439         }
 440
 441         // OK, so we're standing still, presumably at the end of a clip.
 442         // Look at the current pts_out (if it exists), and show the closest
 443         // thing we've got.
 444         int64_t pts_out;
 445         {
 446                 lock_guard<mutex> lock(mu);
 447                 if (current_clip.pts_out < 0) {
 448                         return;
 449                 }
 450                 pts_out = current_clip.pts_out;
 451         }
 452
 453         lock_guard<mutex> lock(frame_mu);
 454         auto it = upper_bound(frames[stream_idx].begin(), frames[stream_idx].end(), pts_out,
 455                 [](int64_t pts, const FrameOnDisk &frame) { return pts < frame.pts; });
 456         if (it == frames[stream_idx].end()) {
 457                 return;
 458         }
 459         destination->setFrame(stream_idx, *it);
 460 }
 461
 462 void Player::take_queue_spot()
 463 {
 464         unique_lock<mutex> lock(queue_state_mu);
 465         ++num_queued_frames;
 466 }
 467
 468 void Player::release_queue_spot()
 469 {
 470         unique_lock<mutex> lock(queue_state_mu);
 471         assert(num_queued_frames > 0);
 472         --num_queued_frames;
 473         new_clip_changed.notify_all();
 474 }