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(Player::StreamOutput stream_output, AVFormatContext *file_avctx)
  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 (stream_output != NO_STREAM_OUTPUT) {
  44                 video_stream.reset(new VideoStream(file_avctx));
  45                 video_stream->start();
  46         }
  47
  48         check_error();
  49
  50         int64_t pts = 0;
  51         Clip next_clip;
  52         size_t next_clip_idx = size_t(-1);
  53         bool got_next_clip = false;
  54         double next_clip_fade_time = -1.0;
  55
  56         while (!should_quit) {
  57 wait_for_clip:
  58                 bool clip_ready;
  59                 steady_clock::time_point before_sleep = steady_clock::now();
  60
  61                 // Wait until we're supposed to play something.
  62                 {
  63                         unique_lock<mutex> lock(queue_state_mu);
  64                         clip_ready = new_clip_changed.wait_for(lock, milliseconds(100), [this] {
  65                                 return should_quit || (new_clip_ready && current_clip.pts_in != -1);
  66                         });
  67                         if (should_quit) {
  68                                 return;
  69                         }
  70                         new_clip_ready = false;
  71                         playing = true;
  72                 }
  73
  74                 steady_clock::duration time_slept = steady_clock::now() - before_sleep;
  75                 pts += duration_cast<duration<size_t, TimebaseRatio>>(time_slept).count();
  76
  77                 if (!clip_ready) {
  78                         if (video_stream != nullptr) {
  79                                 video_stream->schedule_refresh_frame(steady_clock::now(), pts, /*display_func=*/nullptr, QueueSpotHolder());
  80                         }
  81                         continue;
  82                 }
  83
  84                 Clip clip;
  85                 size_t clip_idx;
  86                 unsigned stream_idx;
  87                 {
  88                         lock_guard<mutex> lock(mu);
  89                         clip = current_clip;
  90                         clip_idx = current_clip_idx;
  91                         stream_idx = current_stream_idx;
  92                 }
  93                 steady_clock::time_point origin = steady_clock::now();  // TODO: Add a 100 ms buffer for ramp-up?
  94                 int64_t in_pts_origin = clip.pts_in;
  95 got_clip:
  96                 int64_t out_pts_origin = pts;
  97
  98                 // Start playing exactly at a frame.
  99                 // TODO: Snap secondary (fade-to) clips in the same fashion
 100                 // so that we don't get jank here).
 101                 {
 102                         lock_guard<mutex> lock(frame_mu);
 103
 104                         // Find the first frame such that frame.pts <= in_pts.
 105                         auto it = find_last_frame_before(frames[stream_idx], in_pts_origin);
 106                         if (it != frames[stream_idx].end()) {
 107                                 in_pts_origin = it->pts;
 108                         }
 109                 }
 110
 111                 int64_t in_pts_start_next_clip = -1;
 112                 steady_clock::time_point next_frame_start;
 113                 for (int frameno = 0; !should_quit; ++frameno) {  // Ends when the clip ends.
 114                         double out_pts = out_pts_origin + TIMEBASE * frameno / global_flags.output_framerate;
 115                         next_frame_start =
 116                                 origin + microseconds(lrint((out_pts - out_pts_origin) * 1e6 / TIMEBASE));
 117                         int64_t in_pts = lrint(in_pts_origin + TIMEBASE * frameno * clip.speed / global_flags.output_framerate);
 118                         pts = lrint(out_pts);
 119
 120                         if (in_pts >= clip.pts_out) {
 121                                 break;
 122                         }
 123
 124                         steady_clock::duration time_behind = steady_clock::now() - next_frame_start;
 125                         if (stream_output != FILE_STREAM_OUTPUT && time_behind >= milliseconds(200)) {
 126                                 fprintf(stderr, "WARNING: %ld ms behind, dropping a frame (no matter the type).\n",
 127                                         lrint(1e3 * duration<double>(time_behind).count()));
 128                                 continue;
 129                         }
 130
 131                         double time_left_this_clip = double(clip.pts_out - in_pts) / TIMEBASE / clip.speed;
 132                         if (!got_next_clip && next_clip_callback != nullptr && time_left_this_clip <= clip.fade_time_seconds) {
 133                                 // Find the next clip so that we can begin a fade.
 134                                 tie(next_clip, next_clip_idx) = next_clip_callback();
 135                                 if (next_clip.pts_in != -1) {
 136                                         got_next_clip = true;
 137
 138                                         double duration_next_clip = double(next_clip.pts_out - next_clip.pts_in) / TIMEBASE / clip.speed;
 139                                         next_clip_fade_time = std::min(time_left_this_clip, duration_next_clip);
 140                                         in_pts_start_next_clip = next_clip.pts_in + lrint(next_clip_fade_time * TIMEBASE * clip.speed);
 141                                 }
 142                         }
 143
 144                         // pts not affected by the swapping below.
 145                         int64_t in_pts_for_progress = in_pts, in_pts_secondary_for_progress = -1;
 146
 147                         int primary_stream_idx = stream_idx;
 148                         FrameOnDisk secondary_frame;
 149                         int secondary_stream_idx = -1;
 150                         float fade_alpha = 0.0f;
 151                         if (got_next_clip && time_left_this_clip <= next_clip_fade_time) {
 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 (got_next_clip && 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[next_clip_idx] = 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                         {
 193                                 unique_lock<mutex> lock(queue_state_mu);
 194                                 if (video_stream == nullptr) {
 195                                         // No queue, just wait until the right time and then show the frame.
 196                                         new_clip_changed.wait_until(lock, next_frame_start, [this]{
 197                                                 return should_quit || new_clip_ready || override_stream_idx != -1;
 198                                         });
 199                                 if (should_quit) {
 200                                         return;
 201                                 }
 202                                 } else {
 203                                         // If the queue is full (which is really the state we'd like to be in),
 204                                         // wait until there's room for one more frame (ie., one was output from
 205                                         // VideoStream), or until or until there's a new clip we're supposed to play.
 206                                         //
 207                                         // In this case, we don't sleep until next_frame_start; the displaying is
 208                                         // done by the queue.
 209                                         new_clip_changed.wait(lock, [this]{
 210                                                 if (num_queued_frames < max_queued_frames) {
 211                                                         return true;
 212                                                 }
 213                                                 return should_quit || new_clip_ready || override_stream_idx != -1;
 214                                         });
 215                                 }
 216                                 if (should_quit) {
 217                                         return;
 218                                 }
 219                                 if (new_clip_ready) {
 220                                         if (video_stream != nullptr) {
 221                                                 lock.unlock();  // Urg.
 222                                                 video_stream->clear_queue();
 223                                                 lock.lock();
 224                                         }
 225                                         got_next_clip = false;
 226                                         goto wait_for_clip;
 227                                 }
 228                                 if (override_stream_idx != -1) {
 229                                         stream_idx = override_stream_idx;
 230                                         override_stream_idx = -1;
 231                                         continue;
 232                                 }
 233                         }
 234
 235                         if (frame_lower.pts == frame_upper.pts || global_flags.interpolation_quality == 0) {
 236                                 auto display_func = [this, primary_stream_idx, frame_lower, secondary_frame, fade_alpha]{
 237                                         if (destination != nullptr) {
 238                                                 destination->setFrame(primary_stream_idx, frame_lower, secondary_frame, fade_alpha);
 239                                         }
 240                                 };
 241                                 if (video_stream == nullptr) {
 242                                         display_func();
 243                                 } else {
 244                                         if (secondary_stream_idx == -1) {
 245                                                 video_stream->schedule_original_frame(
 246                                                         next_frame_start, pts, display_func, QueueSpotHolder(this),
 247                                                         frame_lower);
 248                                         } else {
 249                                                 assert(secondary_frame.pts != -1);
 250                                                 video_stream->schedule_faded_frame(next_frame_start, pts, display_func,
 251                                                         QueueSpotHolder(this), frame_lower,
 252                                                         secondary_frame, fade_alpha);
 253                                         }
 254                                 }
 255                                 continue;
 256                         }
 257
 258                         // Snap to input frame: If we can do so with less than 1% jitter
 259                         // (ie., move less than 1% of an _output_ frame), do so.
 260                         // TODO: Snap secondary (fade-to) clips in the same fashion.
 261                         double pts_snap_tolerance = 0.01 * double(TIMEBASE) / global_flags.output_framerate;
 262                         bool snapped = false;
 263                         for (FrameOnDisk snap_frame : { frame_lower, frame_upper }) {
 264                                 if (fabs(snap_frame.pts - in_pts) < pts_snap_tolerance) {
 265                                         auto display_func = [this, primary_stream_idx, snap_frame, secondary_frame, fade_alpha]{
 266                                                 if (destination != nullptr) {
 267                                                         destination->setFrame(primary_stream_idx, snap_frame, secondary_frame, fade_alpha);
 268                                                 }
 269                                         };
 270                                         if (video_stream == nullptr) {
 271                                                 display_func();
 272                                         } else {
 273                                                 if (secondary_stream_idx == -1) {
 274                                                         video_stream->schedule_original_frame(
 275                                                                 next_frame_start, pts, display_func,
 276                                                                 QueueSpotHolder(this), snap_frame);
 277                                                 } else {
 278                                                         assert(secondary_frame.pts != -1);
 279                                                         video_stream->schedule_faded_frame(
 280                                                                 next_frame_start, pts, display_func, QueueSpotHolder(this),
 281                                                                 snap_frame, secondary_frame, fade_alpha);
 282                                                 }
 283                                         }
 284                                         in_pts_origin += snap_frame.pts - in_pts;
 285                                         snapped = true;
 286                                         break;
 287                                 }
 288                         }
 289                         if (snapped) {
 290                                 continue;
 291                         }
 292
 293                         // The snapping above makes us lock to the input framerate, even in the presence
 294                         // of pts drift, for most typical cases where it's needed, like converting 60 → 2x60
 295                         // or 60 → 2x59.94. However, there are some corner cases like 25 → 2x59.94, where we'd
 296                         // get a snap very rarely (in the given case, once every 24 output frames), and by
 297                         // that time, we'd have drifted out. We could have solved this by changing the overall
 298                         // speed ever so slightly, but it requires that we know the actual frame rate (which
 299                         // is difficult in the presence of jitter and missed frames), or at least do some kind
 300                         // of matching/clustering. Instead, we take the opportunity to lock to in-between rational
 301                         // points if we can. E.g., if we are converting 60 → 2x60, we would not only snap to
 302                         // an original frame every other frame; we would also snap to exactly alpha=0.5 every
 303                         // in-between frame. Of course, we will still need to interpolate, but we get a lot
 304                         // closer when we actually get close to an original frame. In other words: Snap more
 305                         // often, but snap less each time. Unless the input and output frame rates are completely
 306                         // decorrelated with no common factor, of course (e.g. 12.345 → 34.567, which we should
 307                         // really never see in practice).
 308                         for (double fraction : { 1.0 / 2.0, 1.0 / 3.0, 2.0 / 3.0, 1.0 / 4.0, 3.0 / 4.0,
 309                                                  1.0 / 5.0, 2.0 / 5.0, 3.0 / 5.0, 4.0 / 5.0 }) {
 310                                 double subsnap_pts = frame_lower.pts + fraction * (frame_upper.pts - frame_lower.pts);
 311                                 if (fabs(subsnap_pts - in_pts) < pts_snap_tolerance) {
 312                                         in_pts_origin += lrint(subsnap_pts) - in_pts;
 313                                         in_pts = lrint(subsnap_pts);
 314                                         break;
 315                                 }
 316                         }
 317
 318                         if (stream_output != FILE_STREAM_OUTPUT && time_behind >= milliseconds(100)) {
 319                                 fprintf(stderr, "WARNING: %ld ms behind, dropping an interpolated frame.\n",
 320                                         lrint(1e3 * duration<double>(time_behind).count()));
 321                                 continue;
 322                         }
 323
 324                         double alpha = double(in_pts - frame_lower.pts) / (frame_upper.pts - frame_lower.pts);
 325
 326                         if (video_stream == nullptr) {
 327                                 // Previews don't do any interpolation.
 328                                 assert(secondary_stream_idx == -1);
 329                                 if (destination != nullptr) {
 330                                         destination->setFrame(primary_stream_idx, frame_lower);
 331                                 }
 332                         } else {
 333                                 auto display_func = [this](shared_ptr<Frame> frame) {
 334                                         if (destination != nullptr) {
 335                                                 destination->setFrame(frame);
 336                                         }
 337                                 };
 338                                 video_stream->schedule_interpolated_frame(
 339                                         next_frame_start, pts, display_func, QueueSpotHolder(this),
 340                                         frame_lower, frame_upper, alpha,
 341                                         secondary_frame, fade_alpha);
 342                         }
 343                 }
 344
 345                 if (should_quit) {
 346                         return;
 347                 }
 348
 349                 // The clip ended.
 350
 351                 // Last-ditch effort to get the next clip (if e.g. the fade time was zero seconds).
 352                 if (!got_next_clip && next_clip_callback != nullptr) {
 353                         tie(next_clip, next_clip_idx) = next_clip_callback();
 354                         if (next_clip.pts_in != -1) {
 355                                 got_next_clip = true;
 356                                 in_pts_start_next_clip = next_clip.pts_in;
 357                         }
 358                 }
 359
 360                 // Switch to next clip if we got it.
 361                 if (got_next_clip) {
 362                         clip = next_clip;
 363                         clip_idx = next_clip_idx;
 364                         stream_idx = next_clip.stream_idx;  // Override is used for previews only, and next_clip is used for live ony.
 365                         if (done_callback != nullptr) {
 366                                 done_callback();
 367                         }
 368                         got_next_clip = false;
 369
 370                         // Start the next clip from the point where the fade went out.
 371                         origin = next_frame_start;
 372                         in_pts_origin = in_pts_start_next_clip;
 373                         goto got_clip;
 374                 }
 375
 376                 {
 377                         unique_lock<mutex> lock(queue_state_mu);
 378                         playing = false;
 379                 }
 380                 if (done_callback != nullptr) {
 381                         done_callback();
 382                 }
 383         }
 384 }
 385
 386 // Find the frame immediately before and after this point.
 387 bool Player::find_surrounding_frames(int64_t pts, int stream_idx, FrameOnDisk *frame_lower, FrameOnDisk *frame_upper)
 388 {
 389         lock_guard<mutex> lock(frame_mu);
 390
 391         // Find the first frame such that frame.pts >= pts.
 392         auto it = find_last_frame_before(frames[stream_idx], pts);
 393         if (it == frames[stream_idx].end()) {
 394                 return false;
 395         }
 396         *frame_upper = *it;
 397
 398         // Find the last frame such that in_pts <= frame.pts (if any).
 399         if (it == frames[stream_idx].begin()) {
 400                 *frame_lower = *it;
 401         } else {
 402                 *frame_lower = *(it - 1);
 403         }
 404         assert(pts >= frame_lower->pts);
 405         assert(pts <= frame_upper->pts);
 406         return true;
 407 }
 408
 409 Player::Player(JPEGFrameView *destination, Player::StreamOutput stream_output, AVFormatContext *file_avctx)
 410         : destination(destination)
 411 {
 412         player_thread = thread(&Player::thread_func, this, stream_output, file_avctx);
 413 }
 414
 415 Player::~Player()
 416 {
 417         should_quit = true;
 418         if (video_stream != nullptr) {
 419                 video_stream->stop();
 420         }
 421         new_clip_changed.notify_all();
 422         player_thread.join();
 423 }
 424
 425 void Player::play_clip(const Clip &clip, size_t clip_idx, unsigned stream_idx)
 426 {
 427         {
 428                 lock_guard<mutex> lock(mu);
 429                 current_clip = clip;
 430                 current_stream_idx = stream_idx;
 431                 current_clip_idx = clip_idx;
 432         }
 433
 434         {
 435                 lock_guard<mutex> lock(queue_state_mu);
 436                 new_clip_ready = true;
 437                 override_stream_idx = -1;
 438                 new_clip_changed.notify_all();
 439         }
 440 }
 441
 442 void Player::override_angle(unsigned stream_idx)
 443 {
 444         // Corner case: If a new clip is waiting to be played, change its stream and then we're done.
 445         {
 446                 unique_lock<mutex> lock(queue_state_mu);
 447                 if (new_clip_ready) {
 448                         lock_guard<mutex> lock2(mu);
 449                         current_stream_idx = stream_idx;
 450                         return;
 451                 }
 452         }
 453
 454         // If we are playing a clip, set override_stream_idx, and the player thread will
 455         // pick it up and change its internal index.
 456         {
 457                 unique_lock<mutex> lock(queue_state_mu);
 458                 if (playing) {
 459                         override_stream_idx = stream_idx;
 460                         new_clip_changed.notify_all();
 461                 }
 462         }
 463
 464         // OK, so we're standing still, presumably at the end of a clip.
 465         // Look at the current pts_out (if it exists), and show the closest
 466         // thing we've got.
 467         int64_t pts_out;
 468         {
 469                 lock_guard<mutex> lock(mu);
 470                 if (current_clip.pts_out < 0) {
 471                         return;
 472                 }
 473                 pts_out = current_clip.pts_out;
 474         }
 475
 476         lock_guard<mutex> lock(frame_mu);
 477         auto it = find_first_frame_at_or_after(frames[stream_idx], pts_out);
 478         if (it == frames[stream_idx].end()) {
 479                 return;
 480         }
 481         destination->setFrame(stream_idx, *it);
 482 }
 483
 484 void Player::take_queue_spot()
 485 {
 486         unique_lock<mutex> lock(queue_state_mu);
 487         ++num_queued_frames;
 488 }
 489
 490 void Player::release_queue_spot()
 491 {
 492         unique_lock<mutex> lock(queue_state_mu);
 493         assert(num_queued_frames > 0);
 494         --num_queued_frames;
 495         new_clip_changed.notify_all();
 496 }
 497
 498 double compute_time_left(const vector<Clip> &clips, const map<size_t, double> &progress)
 499 {
 500         // Look at the last clip and then start counting from there.
 501         assert(!progress.empty());
 502         auto last_it = progress.end();
 503         --last_it;
 504         double remaining = 0.0;
 505         double last_fade_time_seconds = 0.0;
 506         for (size_t row = last_it->first; row < clips.size(); ++row) {
 507                 const Clip &clip = clips[row];
 508                 double clip_length = double(clip.pts_out - clip.pts_in) / TIMEBASE / clip.speed;
 509                 if (row == last_it->first) {
 510                         // A clip we're playing: Subtract the part we've already played.
 511                         remaining = clip_length * (1.0 - last_it->second);
 512                 } else {
 513                         // A clip we haven't played yet: Subtract the part that's overlapping
 514                         // with a previous clip (due to fade).
 515                         remaining += max(clip_length - last_fade_time_seconds, 0.0);
 516                 }
 517                 last_fade_time_seconds = min(clip_length, clip.fade_time_seconds);
 518         }
 519         return remaining;
 520 }