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                 // TODO: Lock the speed to a rational multiple of the frame rate if possible.
 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                                 continue;
 131                         }
 132
 133                         double time_left_this_clip = double(clip.pts_out - in_pts) / TIMEBASE / clip.speed;
 134                         if (!got_next_clip && next_clip_callback != nullptr && time_left_this_clip <= clip.fade_time_seconds) {
 135                                 // Find the next clip so that we can begin a fade.
 136                                 tie(next_clip, next_clip_idx) = next_clip_callback();
 137                                 if (next_clip.pts_in != -1) {
 138                                         got_next_clip = true;
 139
 140                                         double duration_next_clip = double(next_clip.pts_out - next_clip.pts_in) / TIMEBASE / clip.speed;
 141                                         next_clip_fade_time = std::min(time_left_this_clip, duration_next_clip);
 142                                         in_pts_start_next_clip = next_clip.pts_in + lrint(next_clip_fade_time * TIMEBASE * clip.speed);
 143                                 }
 144                         }
 145
 146                         // pts not affected by the swapping below.
 147                         int64_t in_pts_for_progress = in_pts, in_pts_secondary_for_progress = -1;
 148
 149                         int primary_stream_idx = stream_idx;
 150                         FrameOnDisk secondary_frame;
 151                         int secondary_stream_idx = -1;
 152                         float fade_alpha = 0.0f;
 153                         if (got_next_clip && time_left_this_clip <= next_clip_fade_time) {
 154                                 secondary_stream_idx = next_clip.stream_idx;
 155                                 int64_t in_pts_secondary = lrint(next_clip.pts_in + (next_clip_fade_time - time_left_this_clip) * TIMEBASE * clip.speed);
 156                                 in_pts_secondary_for_progress = in_pts_secondary;
 157                                 fade_alpha = 1.0f - time_left_this_clip / next_clip_fade_time;
 158
 159                                 // If more than half-way through the fade, interpolate the next clip
 160                                 // instead of the current one, since it's more visible.
 161                                 if (fade_alpha >= 0.5f) {
 162                                         swap(primary_stream_idx, secondary_stream_idx);
 163                                         swap(in_pts, in_pts_secondary);
 164                                         fade_alpha = 1.0f - fade_alpha;
 165                                 }
 166
 167                                 FrameOnDisk frame_lower, frame_upper;
 168                                 bool ok = find_surrounding_frames(in_pts_secondary, secondary_stream_idx, &frame_lower, &frame_upper);
 169                                 if (ok) {
 170                                         secondary_frame = frame_lower;
 171                                 }
 172                         }
 173
 174                         if (progress_callback != nullptr) {
 175                                 // NOTE: None of this will take into account any snapping done below.
 176                                 double played_this_clip = double(in_pts_for_progress - clip.pts_in) / TIMEBASE / clip.speed;
 177                                 double total_length = double(clip.pts_out - clip.pts_in) / TIMEBASE / clip.speed;
 178                                 map<size_t, double> progress{{ clip_idx, played_this_clip / total_length }};
 179
 180                                 if (got_next_clip && time_left_this_clip <= next_clip_fade_time) {
 181                                         double played_next_clip = double(in_pts_secondary_for_progress - next_clip.pts_in) / TIMEBASE / next_clip.speed;
 182                                         double total_next_length = double(next_clip.pts_out - next_clip.pts_in) / TIMEBASE / next_clip.speed;
 183                                         progress[next_clip_idx] = played_next_clip / total_next_length;
 184                                 }
 185                                 progress_callback(progress);
 186                         }
 187
 188                         FrameOnDisk frame_lower, frame_upper;
 189                         bool ok = find_surrounding_frames(in_pts, primary_stream_idx, &frame_lower, &frame_upper);
 190                         if (!ok) {
 191                                 break;
 192                         }
 193
 194                         {
 195                                 unique_lock<mutex> lock(queue_state_mu);
 196                                 if (video_stream == nullptr) {
 197                                         // No queue, just wait until the right time and then show the frame.
 198                                         new_clip_changed.wait_until(lock, next_frame_start, [this]{
 199                                                 return should_quit || new_clip_ready || override_stream_idx != -1;
 200                                         });
 201                                 if (should_quit) {
 202                                         return;
 203                                 }
 204                                 } else {
 205                                         // If the queue is full (which is really the state we'd like to be in),
 206                                         // wait until there's room for one more frame (ie., one was output from
 207                                         // VideoStream), or until or until there's a new clip we're supposed to play.
 208                                         //
 209                                         // In this case, we don't sleep until next_frame_start; the displaying is
 210                                         // done by the queue.
 211                                         new_clip_changed.wait(lock, [this]{
 212                                                 if (num_queued_frames < max_queued_frames) {
 213                                                         return true;
 214                                                 }
 215                                                 return should_quit || new_clip_ready || override_stream_idx != -1;
 216                                         });
 217                                 }
 218                                 if (should_quit) {
 219                                         return;
 220                                 }
 221                                 if (new_clip_ready) {
 222                                         if (video_stream != nullptr) {
 223                                                 lock.unlock();  // Urg.
 224                                                 video_stream->clear_queue();
 225                                                 lock.lock();
 226                                         }
 227                                         got_next_clip = false;
 228                                         goto wait_for_clip;
 229                                 }
 230                                 if (override_stream_idx != -1) {
 231                                         stream_idx = override_stream_idx;
 232                                         override_stream_idx = -1;
 233                                         continue;
 234                                 }
 235                         }
 236
 237                         if (frame_lower.pts == frame_upper.pts || global_flags.interpolation_quality == 0) {
 238                                 auto display_func = [this, primary_stream_idx, frame_lower, secondary_frame, fade_alpha]{
 239                                         if (destination != nullptr) {
 240                                                 destination->setFrame(primary_stream_idx, frame_lower, secondary_frame, fade_alpha);
 241                                         }
 242                                 };
 243                                 if (video_stream == nullptr) {
 244                                         display_func();
 245                                 } else {
 246                                         if (secondary_stream_idx == -1) {
 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                                                 video_stream->schedule_faded_frame(next_frame_start, pts, display_func,
 253                                                         QueueSpotHolder(this), frame_lower,
 254                                                         secondary_frame, fade_alpha);
 255                                         }
 256                                 }
 257                                 continue;
 258                         }
 259
 260                         // Snap to input frame: If we can do so with less than 1% jitter
 261                         // (ie., move less than 1% of an _output_ frame), do so.
 262                         // TODO: Snap secondary (fade-to) clips in the same fashion.
 263                         bool snapped = false;
 264                         for (FrameOnDisk snap_frame : { frame_lower, frame_upper }) {
 265                                 double snap_pts_as_frameno = (snap_frame.pts - in_pts_origin) * global_flags.output_framerate / TIMEBASE / clip.speed;
 266                                 if (fabs(snap_pts_as_frameno - frameno) < 0.01) {
 267                                         auto display_func = [this, primary_stream_idx, snap_frame, secondary_frame, fade_alpha]{
 268                                                 if (destination != nullptr) {
 269                                                         destination->setFrame(primary_stream_idx, snap_frame, secondary_frame, fade_alpha);
 270                                                 }
 271                                         };
 272                                         if (video_stream == nullptr) {
 273                                                 display_func();
 274                                         } else {
 275                                                 if (secondary_stream_idx == -1) {
 276                                                         video_stream->schedule_original_frame(
 277                                                                 next_frame_start, pts, display_func,
 278                                                                 QueueSpotHolder(this), snap_frame);
 279                                                 } else {
 280                                                         assert(secondary_frame.pts != -1);
 281                                                         video_stream->schedule_faded_frame(
 282                                                                 next_frame_start, pts, display_func, QueueSpotHolder(this),
 283                                                                 snap_frame, secondary_frame, fade_alpha);
 284                                                 }
 285                                         }
 286                                         in_pts_origin += snap_frame.pts - in_pts;
 287                                         snapped = true;
 288                                         break;
 289                                 }
 290                         }
 291                         if (snapped) {
 292                                 continue;
 293                         }
 294
 295                         if (stream_output != FILE_STREAM_OUTPUT && time_behind >= milliseconds(100)) {
 296                                 fprintf(stderr, "WARNING: %ld ms behind, dropping an interpolated frame.\n",
 297                                         lrint(1e3 * duration<double>(time_behind).count()));
 298                                 continue;
 299                         }
 300
 301                         double alpha = double(in_pts - frame_lower.pts) / (frame_upper.pts - frame_lower.pts);
 302
 303                         if (video_stream == nullptr) {
 304                                 // Previews don't do any interpolation.
 305                                 assert(secondary_stream_idx == -1);
 306                                 if (destination != nullptr) {
 307                                         destination->setFrame(primary_stream_idx, frame_lower);
 308                                 }
 309                         } else {
 310                                 auto display_func = [this](shared_ptr<Frame> frame) {
 311                                         if (destination != nullptr) {
 312                                                 destination->setFrame(frame);
 313                                         }
 314                                 };
 315                                 video_stream->schedule_interpolated_frame(
 316                                         next_frame_start, pts, display_func, QueueSpotHolder(this),
 317                                         frame_lower, frame_upper, alpha,
 318                                         secondary_frame, fade_alpha);
 319                         }
 320                 }
 321
 322                 if (should_quit) {
 323                         return;
 324                 }
 325
 326                 // The clip ended.
 327
 328                 // Last-ditch effort to get the next clip (if e.g. the fade time was zero seconds).
 329                 if (!got_next_clip && next_clip_callback != nullptr) {
 330                         tie(next_clip, next_clip_idx) = next_clip_callback();
 331                         if (next_clip.pts_in != -1) {
 332                                 got_next_clip = true;
 333                                 in_pts_start_next_clip = next_clip.pts_in;
 334                         }
 335                 }
 336
 337                 // Switch to next clip if we got it.
 338                 if (got_next_clip) {
 339                         clip = next_clip;
 340                         clip_idx = next_clip_idx;
 341                         stream_idx = next_clip.stream_idx;  // Override is used for previews only, and next_clip is used for live ony.
 342                         if (done_callback != nullptr) {
 343                                 done_callback();
 344                         }
 345                         got_next_clip = false;
 346
 347                         // Start the next clip from the point where the fade went out.
 348                         origin = next_frame_start;
 349                         in_pts_origin = in_pts_start_next_clip;
 350                         goto got_clip;
 351                 }
 352
 353                 {
 354                         unique_lock<mutex> lock(queue_state_mu);
 355                         playing = false;
 356                 }
 357                 if (done_callback != nullptr) {
 358                         done_callback();
 359                 }
 360         }
 361 }
 362
 363 // Find the frame immediately before and after this point.
 364 bool Player::find_surrounding_frames(int64_t pts, int stream_idx, FrameOnDisk *frame_lower, FrameOnDisk *frame_upper)
 365 {
 366         lock_guard<mutex> lock(frame_mu);
 367
 368         // Find the first frame such that frame.pts >= pts.
 369         auto it = find_last_frame_before(frames[stream_idx], 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, Player::StreamOutput stream_output, AVFormatContext *file_avctx)
 387         : destination(destination)
 388 {
 389         player_thread = thread(&Player::thread_func, this, stream_output, file_avctx);
 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 = find_first_frame_at_or_after(frames[stream_idx], pts_out);
 455         if (it == frames[stream_idx].end()) {
 456                 return;
 457         }
 458         destination->setFrame(stream_idx, *it);
 459 }
 460
 461 void Player::take_queue_spot()
 462 {
 463         unique_lock<mutex> lock(queue_state_mu);
 464         ++num_queued_frames;
 465 }
 466
 467 void Player::release_queue_spot()
 468 {
 469         unique_lock<mutex> lock(queue_state_mu);
 470         assert(num_queued_frames > 0);
 471         --num_queued_frames;
 472         new_clip_changed.notify_all();
 473 }
 474
 475 double compute_time_left(const vector<Clip> &clips, const map<size_t, double> &progress)
 476 {
 477         // Look at the last clip and then start counting from there.
 478         assert(!progress.empty());
 479         auto last_it = progress.end();
 480         --last_it;
 481         double remaining = 0.0;
 482         double last_fade_time_seconds = 0.0;
 483         for (size_t row = last_it->first; row < clips.size(); ++row) {
 484                 const Clip &clip = clips[row];
 485                 double clip_length = double(clip.pts_out - clip.pts_in) / TIMEBASE / clip.speed;
 486                 if (row == last_it->first) {
 487                         // A clip we're playing: Subtract the part we've already played.
 488                         remaining = clip_length * (1.0 - last_it->second);
 489                 } else {
 490                         // A clip we haven't played yet: Subtract the part that's overlapping
 491                         // with a previous clip (due to fade).
 492                         remaining += max(clip_length - last_fade_time_seconds, 0.0);
 493                 }
 494                 last_fade_time_seconds = min(clip_length, clip.fade_time_seconds);
 495         }
 496         return remaining;
 497 }