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/metrics.h"
  12 #include "shared/mux.h"
  13 #include "shared/timebase.h"
  14 #include "video_stream.h"
  15
  16 #include <algorithm>
  17 #include <chrono>
  18 #include <condition_variable>
  19 #include <movit/util.h>
  20 #include <mutex>
  21 #include <stdio.h>
  22 #include <thread>
  23 #include <vector>
  24
  25 using namespace std;
  26 using namespace std::chrono;
  27
  28 extern HTTPD *global_httpd;
  29
  30 void Player::thread_func(Player::StreamOutput stream_output, AVFormatContext *file_avctx)
  31 {
  32         pthread_setname_np(pthread_self(), "Player");
  33
  34         QSurface *surface = create_surface();
  35         QOpenGLContext *context = create_context(surface);
  36         if (!make_current(context, surface)) {
  37                 printf("oops\n");
  38                 exit(1);
  39         }
  40
  41         check_error();
  42
  43         // Create the VideoStream object, now that we have an OpenGL context.
  44         if (stream_output != NO_STREAM_OUTPUT) {
  45                 video_stream.reset(new VideoStream(file_avctx));
  46                 video_stream->start();
  47         }
  48
  49         check_error();
  50
  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                                 ++metric_refresh_frame;
  81                                 video_stream->schedule_refresh_frame(steady_clock::now(), pts, /*display_func=*/nullptr, QueueSpotHolder());
  82                         }
  83                         continue;
  84                 }
  85
  86                 Clip clip;
  87                 size_t clip_idx;
  88                 unsigned stream_idx;
  89                 {
  90                         lock_guard<mutex> lock(mu);
  91                         clip = current_clip;
  92                         clip_idx = current_clip_idx;
  93                         stream_idx = current_stream_idx;
  94                 }
  95                 steady_clock::time_point origin = steady_clock::now();  // TODO: Add a 100 ms buffer for ramp-up?
  96                 int64_t in_pts_origin = clip.pts_in;
  97 got_clip:
  98                 int64_t out_pts_origin = pts;
  99
 100                 // Start playing exactly at a frame.
 101                 // TODO: Snap secondary (fade-to) clips in the same fashion
 102                 // so that we don't get jank here).
 103                 {
 104                         lock_guard<mutex> lock(frame_mu);
 105
 106                         // Find the first frame such that frame.pts <= in_pts.
 107                         auto it = find_last_frame_before(frames[stream_idx], in_pts_origin);
 108                         if (it != frames[stream_idx].end()) {
 109                                 in_pts_origin = it->pts;
 110                         }
 111                 }
 112
 113                 int64_t in_pts_start_next_clip = -1;
 114                 steady_clock::time_point next_frame_start;
 115                 for (int frameno = 0; !should_quit; ++frameno) {  // Ends when the clip ends.
 116                         double out_pts = out_pts_origin + TIMEBASE * frameno / global_flags.output_framerate;
 117                         next_frame_start =
 118                                 origin + microseconds(lrint((out_pts - out_pts_origin) * 1e6 / TIMEBASE));
 119                         int64_t in_pts = lrint(in_pts_origin + TIMEBASE * frameno * clip.speed / global_flags.output_framerate);
 120                         pts = lrint(out_pts);
 121
 122                         if (in_pts >= clip.pts_out) {
 123                                 break;
 124                         }
 125
 126                         steady_clock::duration time_behind = steady_clock::now() - next_frame_start;
 127                         if (stream_output != FILE_STREAM_OUTPUT && time_behind >= milliseconds(200)) {
 128                                 fprintf(stderr, "WARNING: %ld ms behind, dropping a frame (no matter the type).\n",
 129                                         lrint(1e3 * duration<double>(time_behind).count()));
 130                                 ++metric_dropped_unconditional_frame;
 131                                 continue;
 132                         }
 133
 134                         double time_left_this_clip = double(clip.pts_out - in_pts) / TIMEBASE / clip.speed;
 135                         if (!got_next_clip && next_clip_callback != nullptr && time_left_this_clip <= clip.fade_time_seconds) {
 136                                 // Find the next clip so that we can begin a fade.
 137                                 tie(next_clip, next_clip_idx) = next_clip_callback();
 138                                 if (next_clip.pts_in != -1) {
 139                                         got_next_clip = true;
 140
 141                                         double duration_next_clip = double(next_clip.pts_out - next_clip.pts_in) / TIMEBASE / clip.speed;
 142                                         next_clip_fade_time = std::min(time_left_this_clip, duration_next_clip);
 143                                         in_pts_start_next_clip = next_clip.pts_in + lrint(next_clip_fade_time * TIMEBASE * clip.speed);
 144                                 }
 145                         }
 146
 147                         // pts not affected by the swapping below.
 148                         int64_t in_pts_for_progress = in_pts, in_pts_secondary_for_progress = -1;
 149
 150                         int primary_stream_idx = stream_idx;
 151                         FrameOnDisk secondary_frame;
 152                         int secondary_stream_idx = -1;
 153                         float fade_alpha = 0.0f;
 154                         if (got_next_clip && time_left_this_clip <= next_clip_fade_time) {
 155                                 secondary_stream_idx = next_clip.stream_idx;
 156                                 int64_t in_pts_secondary = lrint(next_clip.pts_in + (next_clip_fade_time - time_left_this_clip) * TIMEBASE * clip.speed);
 157                                 in_pts_secondary_for_progress = in_pts_secondary;
 158                                 fade_alpha = 1.0f - time_left_this_clip / next_clip_fade_time;
 159
 160                                 // If more than half-way through the fade, interpolate the next clip
 161                                 // instead of the current one, since it's more visible.
 162                                 if (fade_alpha >= 0.5f) {
 163                                         swap(primary_stream_idx, secondary_stream_idx);
 164                                         swap(in_pts, in_pts_secondary);
 165                                         fade_alpha = 1.0f - fade_alpha;
 166                                 }
 167
 168                                 FrameOnDisk frame_lower, frame_upper;
 169                                 bool ok = find_surrounding_frames(in_pts_secondary, secondary_stream_idx, &frame_lower, &frame_upper);
 170                                 if (ok) {
 171                                         secondary_frame = frame_lower;
 172                                 }
 173                         }
 174
 175                         if (progress_callback != nullptr) {
 176                                 // NOTE: None of this will take into account any snapping done below.
 177                                 double played_this_clip = double(in_pts_for_progress - clip.pts_in) / TIMEBASE / clip.speed;
 178                                 double total_length = double(clip.pts_out - clip.pts_in) / TIMEBASE / clip.speed;
 179                                 map<size_t, double> progress{{ clip_idx, played_this_clip / total_length }};
 180
 181                                 if (got_next_clip && time_left_this_clip <= next_clip_fade_time) {
 182                                         double played_next_clip = double(in_pts_secondary_for_progress - next_clip.pts_in) / TIMEBASE / next_clip.speed;
 183                                         double total_next_length = double(next_clip.pts_out - next_clip.pts_in) / TIMEBASE / next_clip.speed;
 184                                         progress[next_clip_idx] = played_next_clip / total_next_length;
 185                                 }
 186                                 progress_callback(progress);
 187                         }
 188
 189                         FrameOnDisk frame_lower, frame_upper;
 190                         bool ok = find_surrounding_frames(in_pts, primary_stream_idx, &frame_lower, &frame_upper);
 191                         if (!ok) {
 192                                 break;
 193                         }
 194
 195                         {
 196                                 unique_lock<mutex> lock(queue_state_mu);
 197                                 if (video_stream == nullptr) {
 198                                         // No queue, just wait until the right time and then show the frame.
 199                                         new_clip_changed.wait_until(lock, next_frame_start, [this]{
 200                                                 return should_quit || new_clip_ready || override_stream_idx != -1;
 201                                         });
 202                                         if (should_quit) {
 203                                                 return;
 204                                         }
 205                                 } else {
 206                                         // If the queue is full (which is really the state we'd like to be in),
 207                                         // wait until there's room for one more frame (ie., one was output from
 208                                         // VideoStream), or until or until there's a new clip we're supposed to play.
 209                                         //
 210                                         // In this case, we don't sleep until next_frame_start; the displaying is
 211                                         // done by the queue.
 212                                         new_clip_changed.wait(lock, [this]{
 213                                                 if (num_queued_frames < max_queued_frames) {
 214                                                         return true;
 215                                                 }
 216                                                 return should_quit || new_clip_ready || override_stream_idx != -1;
 217                                         });
 218                                 }
 219                                 if (should_quit) {
 220                                         return;
 221                                 }
 222                                 if (new_clip_ready) {
 223                                         if (video_stream != nullptr) {
 224                                                 lock.unlock();  // Urg.
 225                                                 video_stream->clear_queue();
 226                                                 lock.lock();
 227                                         }
 228                                         got_next_clip = false;
 229                                         goto wait_for_clip;
 230                                 }
 231                                 if (override_stream_idx != -1) {
 232                                         stream_idx = override_stream_idx;
 233                                         override_stream_idx = -1;
 234                                         continue;
 235                                 }
 236                         }
 237
 238                         if (frame_lower.pts == frame_upper.pts || global_flags.interpolation_quality == 0) {
 239                                 auto display_func = [this, primary_stream_idx, frame_lower, secondary_frame, fade_alpha]{
 240                                         if (destination != nullptr) {
 241                                                 destination->setFrame(primary_stream_idx, frame_lower, secondary_frame, fade_alpha);
 242                                         }
 243                                 };
 244                                 if (video_stream == nullptr) {
 245                                         display_func();
 246                                 } else {
 247                                         if (secondary_stream_idx == -1) {
 248                                                 ++metric_original_frame;
 249                                                 video_stream->schedule_original_frame(
 250                                                         next_frame_start, pts, display_func, QueueSpotHolder(this),
 251                                                         frame_lower);
 252                                         } else {
 253                                                 assert(secondary_frame.pts != -1);
 254                                                 ++metric_faded_frame;
 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                         double pts_snap_tolerance = 0.01 * double(TIMEBASE) / global_flags.output_framerate;
 267                         bool snapped = false;
 268                         for (FrameOnDisk snap_frame : { frame_lower, frame_upper }) {
 269                                 if (fabs(snap_frame.pts - in_pts) < pts_snap_tolerance) {
 270                                         auto display_func = [this, primary_stream_idx, snap_frame, secondary_frame, fade_alpha]{
 271                                                 if (destination != nullptr) {
 272                                                         destination->setFrame(primary_stream_idx, snap_frame, secondary_frame, fade_alpha);
 273                                                 }
 274                                         };
 275                                         if (video_stream == nullptr) {
 276                                                 display_func();
 277                                         } else {
 278                                                 if (secondary_stream_idx == -1) {
 279                                                         ++metric_original_snapped_frame;
 280                                                         video_stream->schedule_original_frame(
 281                                                                 next_frame_start, pts, display_func,
 282                                                                 QueueSpotHolder(this), snap_frame);
 283                                                 } else {
 284                                                         assert(secondary_frame.pts != -1);
 285                                                         ++metric_faded_snapped_frame;
 286                                                         video_stream->schedule_faded_frame(
 287                                                                 next_frame_start, pts, display_func, QueueSpotHolder(this),
 288                                                                 snap_frame, secondary_frame, fade_alpha);
 289                                                 }
 290                                         }
 291                                         in_pts_origin += snap_frame.pts - in_pts;
 292                                         snapped = true;
 293                                         break;
 294                                 }
 295                         }
 296                         if (snapped) {
 297                                 continue;
 298                         }
 299
 300                         // The snapping above makes us lock to the input framerate, even in the presence
 301                         // of pts drift, for most typical cases where it's needed, like converting 60 → 2x60
 302                         // or 60 → 2x59.94. However, there are some corner cases like 25 → 2x59.94, where we'd
 303                         // get a snap very rarely (in the given case, once every 24 output frames), and by
 304                         // that time, we'd have drifted out. We could have solved this by changing the overall
 305                         // speed ever so slightly, but it requires that we know the actual frame rate (which
 306                         // is difficult in the presence of jitter and missed frames), or at least do some kind
 307                         // of matching/clustering. Instead, we take the opportunity to lock to in-between rational
 308                         // points if we can. E.g., if we are converting 60 → 2x60, we would not only snap to
 309                         // an original frame every other frame; we would also snap to exactly alpha=0.5 every
 310                         // in-between frame. Of course, we will still need to interpolate, but we get a lot
 311                         // closer when we actually get close to an original frame. In other words: Snap more
 312                         // often, but snap less each time. Unless the input and output frame rates are completely
 313                         // decorrelated with no common factor, of course (e.g. 12.345 → 34.567, which we should
 314                         // really never see in practice).
 315                         for (double fraction : { 1.0 / 2.0, 1.0 / 3.0, 2.0 / 3.0, 1.0 / 4.0, 3.0 / 4.0,
 316                                                  1.0 / 5.0, 2.0 / 5.0, 3.0 / 5.0, 4.0 / 5.0 }) {
 317                                 double subsnap_pts = frame_lower.pts + fraction * (frame_upper.pts - frame_lower.pts);
 318                                 if (fabs(subsnap_pts - in_pts) < pts_snap_tolerance) {
 319                                         in_pts_origin += lrint(subsnap_pts) - in_pts;
 320                                         in_pts = lrint(subsnap_pts);
 321                                         break;
 322                                 }
 323                         }
 324
 325                         if (stream_output != FILE_STREAM_OUTPUT && time_behind >= milliseconds(100)) {
 326                                 fprintf(stderr, "WARNING: %ld ms behind, dropping an interpolated frame.\n",
 327                                         lrint(1e3 * duration<double>(time_behind).count()));
 328                                 ++metric_dropped_interpolated_frame;
 329                                 continue;
 330                         }
 331
 332                         double alpha = double(in_pts - frame_lower.pts) / (frame_upper.pts - frame_lower.pts);
 333
 334                         if (video_stream == nullptr) {
 335                                 // Previews don't do any interpolation.
 336                                 assert(secondary_stream_idx == -1);
 337                                 if (destination != nullptr) {
 338                                         destination->setFrame(primary_stream_idx, frame_lower);
 339                                 }
 340                         } else {
 341                                 auto display_func = [this](shared_ptr<Frame> frame) {
 342                                         if (destination != nullptr) {
 343                                                 destination->setFrame(frame);
 344                                         }
 345                                 };
 346                                 if (secondary_stream_idx == -1) {
 347                                         ++metric_interpolated_frame;
 348                                 } else {
 349                                         ++metric_interpolated_faded_frame;
 350                                 }
 351                                 video_stream->schedule_interpolated_frame(
 352                                         next_frame_start, pts, display_func, QueueSpotHolder(this),
 353                                         frame_lower, frame_upper, alpha,
 354                                         secondary_frame, fade_alpha);
 355                         }
 356                 }
 357
 358                 if (should_quit) {
 359                         return;
 360                 }
 361
 362                 // The clip ended.
 363
 364                 // Last-ditch effort to get the next clip (if e.g. the fade time was zero seconds).
 365                 if (!got_next_clip && next_clip_callback != nullptr) {
 366                         tie(next_clip, next_clip_idx) = next_clip_callback();
 367                         if (next_clip.pts_in != -1) {
 368                                 got_next_clip = true;
 369                                 in_pts_start_next_clip = next_clip.pts_in;
 370                         }
 371                 }
 372
 373                 // Switch to next clip if we got it.
 374                 if (got_next_clip) {
 375                         clip = next_clip;
 376                         clip_idx = next_clip_idx;
 377                         stream_idx = next_clip.stream_idx;  // Override is used for previews only, and next_clip is used for live ony.
 378                         if (done_callback != nullptr) {
 379                                 done_callback();
 380                         }
 381                         got_next_clip = false;
 382
 383                         // Start the next clip from the point where the fade went out.
 384                         origin = next_frame_start;
 385                         in_pts_origin = in_pts_start_next_clip;
 386                         goto got_clip;
 387                 }
 388
 389                 {
 390                         unique_lock<mutex> lock(queue_state_mu);
 391                         playing = false;
 392                 }
 393                 if (done_callback != nullptr) {
 394                         done_callback();
 395                 }
 396         }
 397 }
 398
 399 // Find the frame immediately before and after this point.
 400 bool Player::find_surrounding_frames(int64_t pts, int stream_idx, FrameOnDisk *frame_lower, FrameOnDisk *frame_upper)
 401 {
 402         lock_guard<mutex> lock(frame_mu);
 403
 404         // Find the first frame such that frame.pts >= pts.
 405         auto it = find_last_frame_before(frames[stream_idx], pts);
 406         if (it == frames[stream_idx].end()) {
 407                 return false;
 408         }
 409         *frame_upper = *it;
 410
 411         // Find the last frame such that in_pts <= frame.pts (if any).
 412         if (it == frames[stream_idx].begin()) {
 413                 *frame_lower = *it;
 414         } else {
 415                 *frame_lower = *(it - 1);
 416         }
 417         assert(pts >= frame_lower->pts);
 418         assert(pts <= frame_upper->pts);
 419         return true;
 420 }
 421
 422 Player::Player(JPEGFrameView *destination, Player::StreamOutput stream_output, AVFormatContext *file_avctx)
 423         : destination(destination)
 424 {
 425         player_thread = thread(&Player::thread_func, this, stream_output, file_avctx);
 426
 427         if (stream_output == HTTPD_STREAM_OUTPUT) {
 428                 global_metrics.add("http_output_frames", {{ "type", "original" }, { "reason", "edge_frame_or_no_interpolation" }}, &metric_original_frame);
 429                 global_metrics.add("http_output_frames", {{ "type", "faded" }, { "reason", "edge_frame_or_no_interpolation" }}, &metric_faded_frame);
 430                 global_metrics.add("http_output_frames", {{ "type", "original" }, { "reason", "snapped" }}, &metric_original_snapped_frame);
 431                 global_metrics.add("http_output_frames", {{ "type", "faded" }, { "reason", "snapped" }}, &metric_faded_snapped_frame);
 432                 global_metrics.add("http_output_frames", {{ "type", "interpolated" }}, &metric_interpolated_frame);
 433                 global_metrics.add("http_output_frames", {{ "type", "interpolated_faded" }}, &metric_interpolated_faded_frame);
 434                 global_metrics.add("http_output_frames", {{ "type", "refresh" }}, &metric_refresh_frame);
 435                 global_metrics.add("http_dropped_frames", {{ "type", "interpolated" }}, &metric_dropped_interpolated_frame);
 436                 global_metrics.add("http_dropped_frames", {{ "type", "unconditional" }}, &metric_dropped_unconditional_frame);
 437         }
 438 }
 439
 440 Player::~Player()
 441 {
 442         should_quit = true;
 443         if (video_stream != nullptr) {
 444                 video_stream->stop();
 445         }
 446         new_clip_changed.notify_all();
 447         player_thread.join();
 448 }
 449
 450 void Player::play_clip(const Clip &clip, size_t clip_idx, unsigned stream_idx)
 451 {
 452         {
 453                 lock_guard<mutex> lock(mu);
 454                 current_clip = clip;
 455                 current_stream_idx = stream_idx;
 456                 current_clip_idx = clip_idx;
 457         }
 458
 459         {
 460                 lock_guard<mutex> lock(queue_state_mu);
 461                 new_clip_ready = true;
 462                 override_stream_idx = -1;
 463                 new_clip_changed.notify_all();
 464         }
 465 }
 466
 467 void Player::override_angle(unsigned stream_idx)
 468 {
 469         // Corner case: If a new clip is waiting to be played, change its stream and then we're done.
 470         {
 471                 unique_lock<mutex> lock(queue_state_mu);
 472                 if (new_clip_ready) {
 473                         lock_guard<mutex> lock2(mu);
 474                         current_stream_idx = stream_idx;
 475                         return;
 476                 }
 477         }
 478
 479         // If we are playing a clip, set override_stream_idx, and the player thread will
 480         // pick it up and change its internal index.
 481         {
 482                 unique_lock<mutex> lock(queue_state_mu);
 483                 if (playing) {
 484                         override_stream_idx = stream_idx;
 485                         new_clip_changed.notify_all();
 486                 }
 487         }
 488
 489         // OK, so we're standing still, presumably at the end of a clip.
 490         // Look at the current pts_out (if it exists), and show the closest
 491         // thing we've got.
 492         int64_t pts_out;
 493         {
 494                 lock_guard<mutex> lock(mu);
 495                 if (current_clip.pts_out < 0) {
 496                         return;
 497                 }
 498                 pts_out = current_clip.pts_out;
 499         }
 500
 501         lock_guard<mutex> lock(frame_mu);
 502         auto it = find_first_frame_at_or_after(frames[stream_idx], pts_out);
 503         if (it == frames[stream_idx].end()) {
 504                 return;
 505         }
 506         destination->setFrame(stream_idx, *it);
 507 }
 508
 509 void Player::take_queue_spot()
 510 {
 511         unique_lock<mutex> lock(queue_state_mu);
 512         ++num_queued_frames;
 513 }
 514
 515 void Player::release_queue_spot()
 516 {
 517         unique_lock<mutex> lock(queue_state_mu);
 518         assert(num_queued_frames > 0);
 519         --num_queued_frames;
 520         new_clip_changed.notify_all();
 521 }
 522
 523 double compute_time_left(const vector<Clip> &clips, const map<size_t, double> &progress)
 524 {
 525         // Look at the last clip and then start counting from there.
 526         assert(!progress.empty());
 527         auto last_it = progress.end();
 528         --last_it;
 529         double remaining = 0.0;
 530         double last_fade_time_seconds = 0.0;
 531         for (size_t row = last_it->first; row < clips.size(); ++row) {
 532                 const Clip &clip = clips[row];
 533                 double clip_length = double(clip.pts_out - clip.pts_in) / TIMEBASE / clip.speed;
 534                 if (row == last_it->first) {
 535                         // A clip we're playing: Subtract the part we've already played.
 536                         remaining = clip_length * (1.0 - last_it->second);
 537                 } else {
 538                         // A clip we haven't played yet: Subtract the part that's overlapping
 539                         // with a previous clip (due to fade).
 540                         remaining += max(clip_length - last_fade_time_seconds, 0.0);
 541                 }
 542                 last_fade_time_seconds = min(clip_length, clip.fade_time_seconds);
 543         }
 544         return remaining;
 545 }