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(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         while (!should_quit) {
  52                 play_playlist_once();
  53         }
  54 }
  55
  56 void Player::play_playlist_once()
  57 {
  58         vector<Clip> clip_list;
  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                 playing = false;
  66                 clip_ready = new_clip_changed.wait_for(lock, milliseconds(100), [this] {
  67                         return should_quit || new_clip_ready;
  68                 });
  69                 if (should_quit) {
  70                         return;
  71                 }
  72                 if (clip_ready) {
  73                         new_clip_ready = false;
  74                         playing = true;
  75                         clip_list = move(queued_clip_list);
  76                         queued_clip_list.clear();
  77                         assert(!clip_list.empty());
  78                 }
  79         }
  80
  81         steady_clock::duration time_slept = steady_clock::now() - before_sleep;
  82         pts += duration_cast<duration<size_t, TimebaseRatio>>(time_slept).count();
  83
  84         if (!clip_ready) {
  85                 if (video_stream != nullptr) {
  86                         ++metric_refresh_frame;
  87                         video_stream->schedule_refresh_frame(steady_clock::now(), pts, /*display_func=*/nullptr, QueueSpotHolder());
  88                 }
  89                 return;
  90         }
  91
  92         steady_clock::time_point origin = steady_clock::now();  // TODO: Add a 100 ms buffer for ramp-up?
  93         int64_t in_pts_origin = clip_list[0].pts_in;
  94         for (size_t clip_idx = 0; clip_idx < clip_list.size(); ++clip_idx) {
  95                 const Clip &clip = clip_list[clip_idx];
  96                 const Clip *next_clip = (clip_idx + 1 < clip_list.size()) ? &clip_list[clip_idx + 1] : nullptr;
  97                 int64_t out_pts_origin = pts;
  98
  99                 double next_clip_fade_time = -1.0;
 100                 if (next_clip != nullptr) {
 101                         double duration_this_clip = double(clip.pts_out - in_pts_origin) / TIMEBASE / clip.speed;
 102                         double duration_next_clip = double(next_clip->pts_out - next_clip->pts_in) / TIMEBASE / clip.speed;
 103                         next_clip_fade_time = min(min(duration_this_clip, duration_next_clip), clip.fade_time_seconds);
 104                 }
 105
 106                 int stream_idx = clip.stream_idx;
 107
 108                 // Start playing exactly at a frame.
 109                 // TODO: Snap secondary (fade-to) clips in the same fashion
 110                 // so that we don't get jank here).
 111                 {
 112                         lock_guard<mutex> lock(frame_mu);
 113
 114                         // Find the first frame such that frame.pts <= in_pts.
 115                         auto it = find_last_frame_before(frames[stream_idx], in_pts_origin);
 116                         if (it != frames[stream_idx].end()) {
 117                                 in_pts_origin = it->pts;
 118                         }
 119                 }
 120
 121                 steady_clock::time_point next_frame_start;
 122                 for (int frameno = 0; !should_quit; ++frameno) {  // Ends when the clip ends.
 123                         double out_pts = out_pts_origin + TIMEBASE * frameno / global_flags.output_framerate;
 124                         next_frame_start =
 125                                 origin + microseconds(lrint((out_pts - out_pts_origin) * 1e6 / TIMEBASE));
 126                         int64_t in_pts = lrint(in_pts_origin + TIMEBASE * frameno * clip.speed / global_flags.output_framerate);
 127                         pts = lrint(out_pts);
 128
 129                         if (in_pts >= clip.pts_out) {
 130                                 break;
 131                         }
 132
 133                         steady_clock::duration time_behind = steady_clock::now() - next_frame_start;
 134                         if (stream_output != FILE_STREAM_OUTPUT && time_behind >= milliseconds(200)) {
 135                                 fprintf(stderr, "WARNING: %ld ms behind, dropping a frame (no matter the type).\n",
 136                                         lrint(1e3 * duration<double>(time_behind).count()));
 137                                 ++metric_dropped_unconditional_frame;
 138                                 continue;
 139                         }
 140
 141
 142                         // pts not affected by the swapping below.
 143                         int64_t in_pts_for_progress = in_pts, in_pts_secondary_for_progress = -1;
 144
 145                         int primary_stream_idx = stream_idx;
 146                         FrameOnDisk secondary_frame;
 147                         int secondary_stream_idx = -1;
 148                         float fade_alpha = 0.0f;
 149                         double time_left_this_clip = double(clip.pts_out - in_pts) / TIMEBASE / clip.speed;
 150                         if (next_clip != nullptr && time_left_this_clip <= next_clip_fade_time) {
 151                                 // We're in a fade to the next clip.
 152                                 secondary_stream_idx = next_clip->stream_idx;
 153                                 int64_t in_pts_secondary = lrint(next_clip->pts_in + (next_clip_fade_time - time_left_this_clip) * TIMEBASE * clip.speed);
 154                                 in_pts_secondary_for_progress = in_pts_secondary;
 155                                 fade_alpha = 1.0f - time_left_this_clip / next_clip_fade_time;
 156
 157                                 // If more than half-way through the fade, interpolate the next clip
 158                                 // instead of the current one, since it's more visible.
 159                                 if (fade_alpha >= 0.5f) {
 160                                         swap(primary_stream_idx, secondary_stream_idx);
 161                                         swap(in_pts, in_pts_secondary);
 162                                         fade_alpha = 1.0f - fade_alpha;
 163                                 }
 164
 165                                 FrameOnDisk frame_lower, frame_upper;
 166                                 bool ok = find_surrounding_frames(in_pts_secondary, secondary_stream_idx, &frame_lower, &frame_upper);
 167                                 if (ok) {
 168                                         secondary_frame = frame_lower;
 169                                 }
 170                         }
 171
 172                         if (progress_callback != nullptr) {
 173                                 // NOTE: None of this will take into account any snapping done below.
 174                                 double played_this_clip = double(in_pts_for_progress - clip.pts_in) / TIMEBASE / clip.speed;
 175                                 double total_length = double(clip.pts_out - clip.pts_in) / TIMEBASE / clip.speed;
 176                                 map<size_t, double> progress{{ clip_idx, played_this_clip / total_length }};
 177
 178                                 if (next_clip != nullptr && time_left_this_clip <= next_clip_fade_time) {
 179                                         double played_next_clip = double(in_pts_secondary_for_progress - next_clip->pts_in) / TIMEBASE / next_clip->speed;
 180                                         double total_next_length = double(next_clip->pts_out - next_clip->pts_in) / TIMEBASE / next_clip->speed;
 181                                         progress[clip_idx + 1] = played_next_clip / total_next_length;
 182                                 }
 183                                 progress_callback(progress);
 184                         }
 185
 186                         FrameOnDisk frame_lower, frame_upper;
 187                         bool ok = find_surrounding_frames(in_pts, primary_stream_idx, &frame_lower, &frame_upper);
 188                         if (!ok) {
 189                                 break;
 190                         }
 191
 192                         // Wait until we should, or (given buffering) can, output the frame.
 193                         {
 194                                 unique_lock<mutex> lock(queue_state_mu);
 195                                 if (video_stream == nullptr) {
 196                                         // No queue, just wait until the right time and then show the frame.
 197                                         new_clip_changed.wait_until(lock, next_frame_start, [this]{
 198                                                 return should_quit || new_clip_ready || override_stream_idx != -1;
 199                                         });
 200                                         if (should_quit) {
 201                                                 return;
 202                                         }
 203                                 } else {
 204                                         // If the queue is full (which is really the state we'd like to be in),
 205                                         // wait until there's room for one more frame (ie., one was output from
 206                                         // VideoStream), or until or until there's a new clip we're supposed to play.
 207                                         //
 208                                         // In this case, we don't sleep until next_frame_start; the displaying is
 209                                         // done by the queue.
 210                                         new_clip_changed.wait(lock, [this]{
 211                                                 if (num_queued_frames < max_queued_frames) {
 212                                                         return true;
 213                                                 }
 214                                                 return should_quit || new_clip_ready || override_stream_idx != -1;
 215                                         });
 216                                 }
 217                                 if (should_quit) {
 218                                         return;
 219                                 }
 220                                 if (new_clip_ready) {
 221                                         if (video_stream != nullptr) {
 222                                                 lock.unlock();  // Urg.
 223                                                 video_stream->clear_queue();
 224                                                 lock.lock();
 225                                         }
 226                                         return;
 227                                 }
 228                                 // Honor if we got an override request for the camera.
 229                                 if (override_stream_idx != -1) {
 230                                         stream_idx = override_stream_idx;
 231                                         override_stream_idx = -1;
 232                                         continue;
 233                                 }
 234                         }
 235
 236                         if (frame_lower.pts == frame_upper.pts || global_flags.interpolation_quality == 0) {
 237                                 auto display_func = [this, primary_stream_idx, frame_lower, secondary_frame, fade_alpha]{
 238                                         if (destination != nullptr) {
 239                                                 destination->setFrame(primary_stream_idx, frame_lower, secondary_frame, fade_alpha);
 240                                         }
 241                                 };
 242                                 if (video_stream == nullptr) {
 243                                         display_func();
 244                                 } else {
 245                                         if (secondary_stream_idx == -1) {
 246                                                 ++metric_original_frame;
 247                                                 video_stream->schedule_original_frame(
 248                                                         next_frame_start, pts, display_func, QueueSpotHolder(this),
 249                                                         frame_lower);
 250                                         } else {
 251                                                 assert(secondary_frame.pts != -1);
 252                                                 ++metric_faded_frame;
 253                                                 video_stream->schedule_faded_frame(next_frame_start, pts, display_func,
 254                                                         QueueSpotHolder(this), frame_lower,
 255                                                         secondary_frame, fade_alpha);
 256                                         }
 257                                 }
 258                                 last_pts_played = frame_lower.pts;
 259                                 continue;
 260                         }
 261
 262                         // Snap to input frame: If we can do so with less than 1% jitter
 263                         // (ie., move less than 1% of an _output_ frame), do so.
 264                         // TODO: Snap secondary (fade-to) clips in the same fashion.
 265                         double pts_snap_tolerance = 0.01 * double(TIMEBASE) / global_flags.output_framerate;
 266                         bool snapped = false;
 267                         for (FrameOnDisk snap_frame : { frame_lower, frame_upper }) {
 268                                 if (fabs(snap_frame.pts - in_pts) < pts_snap_tolerance) {
 269                                         auto display_func = [this, primary_stream_idx, snap_frame, secondary_frame, fade_alpha]{
 270                                                 if (destination != nullptr) {
 271                                                         destination->setFrame(primary_stream_idx, snap_frame, secondary_frame, fade_alpha);
 272                                                 }
 273                                         };
 274                                         if (video_stream == nullptr) {
 275                                                 display_func();
 276                                         } else {
 277                                                 if (secondary_stream_idx == -1) {
 278                                                         ++metric_original_snapped_frame;
 279                                                         video_stream->schedule_original_frame(
 280                                                                 next_frame_start, pts, display_func,
 281                                                                 QueueSpotHolder(this), snap_frame);
 282                                                 } else {
 283                                                         assert(secondary_frame.pts != -1);
 284                                                         ++metric_faded_snapped_frame;
 285                                                         video_stream->schedule_faded_frame(
 286                                                                 next_frame_start, pts, display_func, QueueSpotHolder(this),
 287                                                                 snap_frame, secondary_frame, fade_alpha);
 288                                                 }
 289                                         }
 290                                         in_pts_origin += snap_frame.pts - in_pts;
 291                                         snapped = true;
 292                                         last_pts_played = snap_frame.pts;
 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                                 last_pts_played = frame_lower.pts;
 341                         } else {
 342                                 auto display_func = [this](shared_ptr<Frame> frame) {
 343                                         if (destination != nullptr) {
 344                                                 destination->setFrame(frame);
 345                                         }
 346                                 };
 347                                 if (secondary_stream_idx == -1) {
 348                                         ++metric_interpolated_frame;
 349                                 } else {
 350                                         ++metric_interpolated_faded_frame;
 351                                 }
 352                                 video_stream->schedule_interpolated_frame(
 353                                         next_frame_start, pts, display_func, QueueSpotHolder(this),
 354                                         frame_lower, frame_upper, alpha,
 355                                         secondary_frame, fade_alpha);
 356                                 last_pts_played = in_pts;  // Not really needed; only previews use last_pts_played.
 357                         }
 358                 }
 359
 360                 // The clip ended.
 361                 if (should_quit) {
 362                         return;
 363                 }
 364                 if (done_callback != nullptr) {
 365                         done_callback();
 366                 }
 367
 368                 // Start the next clip from the point where the fade went out.
 369                 if (next_clip != nullptr) {
 370                         origin = next_frame_start;
 371                         in_pts_origin = next_clip->pts_in + lrint(next_clip_fade_time * TIMEBASE * clip.speed);
 372                 }
 373         }
 374
 375         if (done_callback != nullptr) {
 376                 done_callback();
 377         }
 378 }
 379
 380 // Find the frame immediately before and after this point.
 381 bool Player::find_surrounding_frames(int64_t pts, int stream_idx, FrameOnDisk *frame_lower, FrameOnDisk *frame_upper)
 382 {
 383         lock_guard<mutex> lock(frame_mu);
 384
 385         // Find the first frame such that frame.pts >= pts.
 386         auto it = find_last_frame_before(frames[stream_idx], pts);
 387         if (it == frames[stream_idx].end()) {
 388                 return false;
 389         }
 390         *frame_upper = *it;
 391
 392         // Find the last frame such that in_pts <= frame.pts (if any).
 393         if (it == frames[stream_idx].begin()) {
 394                 *frame_lower = *it;
 395         } else {
 396                 *frame_lower = *(it - 1);
 397         }
 398         assert(pts >= frame_lower->pts);
 399         assert(pts <= frame_upper->pts);
 400         return true;
 401 }
 402
 403 Player::Player(JPEGFrameView *destination, Player::StreamOutput stream_output, AVFormatContext *file_avctx)
 404         : destination(destination), stream_output(stream_output)
 405 {
 406         player_thread = thread(&Player::thread_func, this, file_avctx);
 407
 408         if (stream_output == HTTPD_STREAM_OUTPUT) {
 409                 global_metrics.add("http_output_frames", {{ "type", "original" }, { "reason", "edge_frame_or_no_interpolation" }}, &metric_original_frame);
 410                 global_metrics.add("http_output_frames", {{ "type", "faded" }, { "reason", "edge_frame_or_no_interpolation" }}, &metric_faded_frame);
 411                 global_metrics.add("http_output_frames", {{ "type", "original" }, { "reason", "snapped" }}, &metric_original_snapped_frame);
 412                 global_metrics.add("http_output_frames", {{ "type", "faded" }, { "reason", "snapped" }}, &metric_faded_snapped_frame);
 413                 global_metrics.add("http_output_frames", {{ "type", "interpolated" }}, &metric_interpolated_frame);
 414                 global_metrics.add("http_output_frames", {{ "type", "interpolated_faded" }}, &metric_interpolated_faded_frame);
 415                 global_metrics.add("http_output_frames", {{ "type", "refresh" }}, &metric_refresh_frame);
 416                 global_metrics.add("http_dropped_frames", {{ "type", "interpolated" }}, &metric_dropped_interpolated_frame);
 417                 global_metrics.add("http_dropped_frames", {{ "type", "unconditional" }}, &metric_dropped_unconditional_frame);
 418         }
 419 }
 420
 421 Player::~Player()
 422 {
 423         should_quit = true;
 424         if (video_stream != nullptr) {
 425                 video_stream->stop();
 426         }
 427         new_clip_changed.notify_all();
 428         player_thread.join();
 429 }
 430
 431 void Player::play(const vector<Clip> &clips)
 432 {
 433         lock_guard<mutex> lock(queue_state_mu);
 434         new_clip_ready = true;
 435         queued_clip_list = clips;
 436         override_stream_idx = -1;
 437         new_clip_changed.notify_all();
 438 }
 439
 440 void Player::override_angle(unsigned stream_idx)
 441 {
 442         int64_t last_pts;
 443
 444         // Corner case: If a new clip is waiting to be played, change its stream and then we're done.
 445         {
 446                 lock_guard<mutex> lock(queue_state_mu);
 447                 if (new_clip_ready) {
 448                         assert(queued_clip_list.size() == 1);
 449                         queued_clip_list[0].stream_idx = stream_idx;
 450                         return;
 451                 }
 452
 453                 // If we are playing a clip, set override_stream_idx, and the player thread will
 454                 // pick it up and change its internal index.
 455                 if (playing) {
 456                         override_stream_idx = stream_idx;
 457                         new_clip_changed.notify_all();
 458                         return;
 459                 }
 460
 461                 // OK, so we're standing still, presumably at the end of a clip.
 462                 // Look at the last frame played (if it exists), and show the closest
 463                 // thing we've got.
 464                 if (last_pts_played < 0) {
 465                         return;
 466                 }
 467                 last_pts = last_pts_played;
 468         }
 469
 470         lock_guard<mutex> lock(frame_mu);
 471         auto it = find_first_frame_at_or_after(frames[stream_idx], last_pts);
 472         if (it == frames[stream_idx].end()) {
 473                 return;
 474         }
 475         destination->setFrame(stream_idx, *it);
 476 }
 477
 478 void Player::take_queue_spot()
 479 {
 480         lock_guard<mutex> lock(queue_state_mu);
 481         ++num_queued_frames;
 482 }
 483
 484 void Player::release_queue_spot()
 485 {
 486         lock_guard<mutex> lock(queue_state_mu);
 487         assert(num_queued_frames > 0);
 488         --num_queued_frames;
 489         new_clip_changed.notify_all();
 490 }
 491
 492 double compute_time_left(const vector<Clip> &clips, const map<size_t, double> &progress)
 493 {
 494         // Look at the last clip and then start counting from there.
 495         assert(!progress.empty());
 496         auto last_it = progress.end();
 497         --last_it;
 498         double remaining = 0.0;
 499         double last_fade_time_seconds = 0.0;
 500         for (size_t row = last_it->first; row < clips.size(); ++row) {
 501                 const Clip &clip = clips[row];
 502                 double clip_length = double(clip.pts_out - clip.pts_in) / TIMEBASE / clip.speed;
 503                 if (row == last_it->first) {
 504                         // A clip we're playing: Subtract the part we've already played.
 505                         remaining = clip_length * (1.0 - last_it->second);
 506                 } else {
 507                         // A clip we haven't played yet: Subtract the part that's overlapping
 508                         // with a previous clip (due to fade).
 509                         remaining += max(clip_length - last_fade_time_seconds, 0.0);
 510                 }
 511                 last_fade_time_seconds = min(clip_length, clip.fade_time_seconds);
 512         }
 513         return remaining;
 514 }