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

   1 #include "player.h"
   2
   3 #include "clip_list.h"
   4 #include "context.h"
   5 #include "defs.h"
   6 #include "ffmpeg_raii.h"
   7 #include "frame_on_disk.h"
   8 #include "httpd.h"
   9 #include "jpeg_frame_view.h"
  10 #include "mux.h"
  11 #include "timebase.h"
  12 #include "video_stream.h"
  13
  14 #include <algorithm>
  15 #include <chrono>
  16 #include <condition_variable>
  17 #include <movit/util.h>
  18 #include <mutex>
  19 #include <stdio.h>
  20 #include <thread>
  21 #include <vector>
  22
  23 using namespace std;
  24 using namespace std::chrono;
  25
  26 extern HTTPD *global_httpd;
  27
  28 void Player::thread_func(bool also_output_to_stream)
  29 {
  30         pthread_setname_np(pthread_self(), "Player");
  31
  32         QSurface *surface = create_surface();
  33         QOpenGLContext *context = create_context(surface);
  34         if (!make_current(context, surface)) {
  35                 printf("oops\n");
  36                 exit(1);
  37         }
  38
  39         check_error();
  40
  41         // Create the VideoStream object, now that we have an OpenGL context.
  42         if (also_output_to_stream) {
  43                 video_stream.reset(new VideoStream);
  44                 video_stream->start();
  45         }
  46
  47         check_error();
  48
  49         constexpr double output_framerate = 60000.0 / 1001.0;  // FIXME: make configurable
  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         for ( ;; ) {
  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 new_clip_ready && current_clip.pts_in != -1;
  66                         });
  67                         new_clip_ready = false;
  68                         playing = true;
  69                 }
  70
  71                 steady_clock::duration time_slept = steady_clock::now() - before_sleep;
  72                 pts += duration_cast<duration<size_t, TimebaseRatio>>(time_slept).count();
  73
  74                 if (!clip_ready) {
  75                         if (video_stream != nullptr) {
  76                                 video_stream->schedule_refresh_frame(steady_clock::now(), pts, /*display_func=*/nullptr, QueueSpotHolder());
  77                         }
  78                         continue;
  79                 }
  80
  81                 Clip clip;
  82                 size_t clip_idx;
  83                 unsigned stream_idx;
  84                 {
  85                         lock_guard<mutex> lock(mu);
  86                         clip = current_clip;
  87                         clip_idx = current_clip_idx;
  88                         stream_idx = current_stream_idx;
  89                 }
  90                 steady_clock::time_point origin = steady_clock::now();  // TODO: Add a 100 ms buffer for ramp-up?
  91                 int64_t in_pts_origin = clip.pts_in;
  92 got_clip:
  93                 int64_t out_pts_origin = pts;
  94
  95                 // Start playing exactly at a frame.
  96                 // TODO: Snap secondary (fade-to) clips in the same fashion
  97                 // so that we don't get jank here).
  98                 {
  99                         lock_guard<mutex> lock(frame_mu);
 100
 101                         // Find the first frame such that frame.pts <= in_pts.
 102                         auto it = lower_bound(frames[stream_idx].begin(),
 103                                 frames[stream_idx].end(),
 104                                 in_pts_origin,
 105                                 [](const FrameOnDisk &frame, int64_t pts) { return frame.pts < pts; });
 106                         if (it != frames[stream_idx].end()) {
 107                                 in_pts_origin = it->pts;
 108                         }
 109                 }
 110
 111                 // TODO: Lock to a rational multiple of the frame rate if possible.
 112                 double speed = 0.5;
 113
 114                 int64_t in_pts_start_next_clip = -1;
 115                 for (int frameno = 0; ; ++frameno) {  // Ends when the clip ends.
 116                         double out_pts = out_pts_origin + TIMEBASE * frameno / output_framerate;
 117                         steady_clock::time_point 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 * speed / 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 (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 / 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 = (next_clip.pts_out - next_clip.pts_in) / TIMEBASE / 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 * 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 * 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 / speed;
 177                                 double total_length = double(clip.pts_out - clip.pts_in) / TIMEBASE / 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 / speed;
 182                                         double total_next_length = double(next_clip.pts_out - next_clip.pts_in) / TIMEBASE / 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 new_clip_ready || override_stream_idx != -1;
 200                                         });
 201                                 } else {
 202                                         // If the queue is full (which is really the state we'd like to be in),
 203                                         // wait until there's room for one more frame (ie., one was output from
 204                                         // VideoStream), or until or until there's a new clip we're supposed to play.
 205                                         //
 206                                         // In this case, we don't sleep until next_frame_start; the displaying is
 207                                         // done by the queue.
 208                                         new_clip_changed.wait(lock, [this]{
 209                                                 if (num_queued_frames < max_queued_frames) {
 210                                                         return true;
 211                                                 }
 212                                                 return new_clip_ready || override_stream_idx != -1;
 213                                         });
 214                                 }
 215                                 if (new_clip_ready) {
 216                                         if (video_stream != nullptr) {
 217                                                 lock.unlock();  // Urg.
 218                                                 video_stream->clear_queue();
 219                                                 lock.lock();
 220                                         }
 221                                         got_next_clip = false;
 222                                         goto wait_for_clip;
 223                                 }
 224                                 if (override_stream_idx != -1) {
 225                                         stream_idx = override_stream_idx;
 226                                         override_stream_idx = -1;
 227                                         continue;
 228                                 }
 229                         }
 230
 231                         if (frame_lower.pts == frame_upper.pts) {
 232                                 auto display_func = [this, primary_stream_idx, frame_lower, secondary_frame, fade_alpha]{
 233                                         destination->setFrame(primary_stream_idx, frame_lower, secondary_frame, fade_alpha);
 234                                 };
 235                                 if (video_stream == nullptr) {
 236                                         display_func();
 237                                 } else {
 238                                         if (secondary_stream_idx == -1) {
 239                                                 video_stream->schedule_original_frame(
 240                                                         next_frame_start, pts, display_func, QueueSpotHolder(this),
 241                                                         frame_lower);
 242                                         } else {
 243                                                 assert(secondary_frame.pts != -1);
 244                                                 video_stream->schedule_faded_frame(next_frame_start, pts, display_func,
 245                                                         QueueSpotHolder(this), frame_lower,
 246                                                         secondary_frame, fade_alpha);
 247                                         }
 248                                 }
 249                                 continue;
 250                         }
 251
 252                         // Snap to input frame: If we can do so with less than 1% jitter
 253                         // (ie., move less than 1% of an _output_ frame), do so.
 254                         // TODO: Snap secondary (fade-to) clips in the same fashion.
 255                         bool snapped = false;
 256                         for (int64_t snap_pts : { frame_lower.pts, frame_upper.pts }) {
 257                                 double snap_pts_as_frameno = (snap_pts - in_pts_origin) * output_framerate / TIMEBASE / speed;
 258                                 if (fabs(snap_pts_as_frameno - frameno) < 0.01) {
 259                                         FrameOnDisk snap_frame = frame_lower;
 260                                         snap_frame.pts = snap_pts;
 261                                         auto display_func = [this, primary_stream_idx, snap_frame, secondary_frame, fade_alpha]{
 262                                                 destination->setFrame(primary_stream_idx, snap_frame, secondary_frame, fade_alpha);
 263                                         };
 264                                         if (video_stream == nullptr) {
 265                                                 display_func();
 266                                         } else {
 267                                                 if (secondary_stream_idx == -1) {
 268                                                         video_stream->schedule_original_frame(
 269                                                                 next_frame_start, pts, display_func,
 270                                                                 QueueSpotHolder(this), snap_frame);
 271                                                 } else {
 272                                                         assert(secondary_frame.pts != -1);
 273                                                         video_stream->schedule_faded_frame(
 274                                                                 next_frame_start, pts, display_func, QueueSpotHolder(this),
 275                                                                 snap_frame, secondary_frame, fade_alpha);
 276                                                 }
 277                                         }
 278                                         in_pts_origin += snap_pts - in_pts;
 279                                         snapped = true;
 280                                         break;
 281                                 }
 282                         }
 283                         if (snapped) {
 284                                 continue;
 285                         }
 286
 287                         if (time_behind >= milliseconds(100)) {
 288                                 fprintf(stderr, "WARNING: %ld ms behind, dropping an interpolated frame.\n",
 289                                         lrint(1e3 * duration<double>(time_behind).count()));
 290                                 continue;
 291                         }
 292
 293                         double alpha = double(in_pts - frame_lower.pts) / (frame_upper.pts - frame_lower.pts);
 294
 295                         if (video_stream == nullptr) {
 296                                 // Previews don't do any interpolation.
 297                                 assert(secondary_stream_idx == -1);
 298                                 destination->setFrame(primary_stream_idx, frame_lower);
 299                         } else {
 300                                 auto display_func = [this](shared_ptr<Frame> frame) {
 301                                         destination->setFrame(frame);
 302                                 };
 303                                 video_stream->schedule_interpolated_frame(
 304                                         next_frame_start, pts, display_func, QueueSpotHolder(this),
 305                                         frame_lower, frame_upper, alpha,
 306                                         secondary_frame, fade_alpha);
 307                         }
 308                 }
 309
 310                 // The clip ended.
 311
 312                 // Last-ditch effort to get the next clip (if e.g. the fade time was zero seconds).
 313                 if (!got_next_clip && next_clip_callback != nullptr) {
 314                         tie(next_clip, next_clip_idx) = next_clip_callback();
 315                         if (next_clip.pts_in != -1) {
 316                                 got_next_clip = true;
 317                                 in_pts_start_next_clip = next_clip.pts_in;
 318                         }
 319                 }
 320
 321                 // Switch to next clip if we got it.
 322                 if (got_next_clip) {
 323                         clip = next_clip;
 324                         clip_idx = next_clip_idx;
 325                         stream_idx = next_clip.stream_idx;  // Override is used for previews only, and next_clip is used for live ony.
 326                         if (done_callback != nullptr) {
 327                                 done_callback();
 328                         }
 329                         got_next_clip = false;
 330
 331                         // Start the next clip from the point where the fade went out.
 332                         origin = steady_clock::now();
 333                         in_pts_origin = in_pts_start_next_clip;
 334                         goto got_clip;
 335                 }
 336
 337                 {
 338                         unique_lock<mutex> lock(queue_state_mu);
 339                         playing = false;
 340                 }
 341                 if (done_callback != nullptr) {
 342                         done_callback();
 343                 }
 344         }
 345 }
 346
 347 // Find the frame immediately before and after this point.
 348 bool Player::find_surrounding_frames(int64_t pts, int stream_idx, FrameOnDisk *frame_lower, FrameOnDisk *frame_upper)
 349 {
 350         lock_guard<mutex> lock(frame_mu);
 351
 352         // Find the first frame such that frame.pts >= pts.
 353         auto it = lower_bound(frames[stream_idx].begin(),
 354                 frames[stream_idx].end(),
 355                 pts,
 356                 [](const FrameOnDisk &frame, int64_t pts) { return frame.pts < pts; });
 357         if (it == frames[stream_idx].end()) {
 358                 return false;
 359         }
 360         *frame_upper = *it;
 361
 362         // Find the last frame such that in_pts <= frame.pts (if any).
 363         if (it == frames[stream_idx].begin()) {
 364                 *frame_lower = *it;
 365         } else {
 366                 *frame_lower = *(it - 1);
 367         }
 368         assert(pts >= frame_lower->pts);
 369         assert(pts <= frame_upper->pts);
 370         return true;
 371 }
 372
 373 Player::Player(JPEGFrameView *destination, bool also_output_to_stream)
 374         : destination(destination)
 375 {
 376         thread(&Player::thread_func, this, also_output_to_stream).detach();
 377 }
 378
 379 void Player::play_clip(const Clip &clip, size_t clip_idx, unsigned stream_idx)
 380 {
 381         {
 382                 lock_guard<mutex> lock(mu);
 383                 current_clip = clip;
 384                 current_stream_idx = stream_idx;
 385                 current_clip_idx = clip_idx;
 386         }
 387
 388         {
 389                 lock_guard<mutex> lock(queue_state_mu);
 390                 new_clip_ready = true;
 391                 override_stream_idx = -1;
 392                 new_clip_changed.notify_all();
 393         }
 394 }
 395
 396 void Player::override_angle(unsigned stream_idx)
 397 {
 398         // Corner case: If a new clip is waiting to be played, change its stream and then we're done.
 399         {
 400                 unique_lock<mutex> lock(queue_state_mu);
 401                 if (new_clip_ready) {
 402                         lock_guard<mutex> lock2(mu);
 403                         current_stream_idx = stream_idx;
 404                         return;
 405                 }
 406         }
 407
 408         // If we are playing a clip, set override_stream_idx, and the player thread will
 409         // pick it up and change its internal index.
 410         {
 411                 unique_lock<mutex> lock(queue_state_mu);
 412                 if (playing) {
 413                         override_stream_idx = stream_idx;
 414                         new_clip_changed.notify_all();
 415                 }
 416         }
 417
 418         // OK, so we're standing still, presumably at the end of a clip.
 419         // Look at the current pts_out (if it exists), and show the closest
 420         // thing we've got.
 421         int64_t pts_out;
 422         {
 423                 lock_guard<mutex> lock(mu);
 424                 if (current_clip.pts_out < 0) {
 425                         return;
 426                 }
 427                 pts_out = current_clip.pts_out;
 428         }
 429
 430         lock_guard<mutex> lock(frame_mu);
 431         auto it = upper_bound(frames[stream_idx].begin(), frames[stream_idx].end(), pts_out,
 432                 [](int64_t pts, const FrameOnDisk &frame) { return pts < frame.pts; });
 433         if (it == frames[stream_idx].end()) {
 434                 return;
 435         }
 436         destination->setFrame(stream_idx, *it);
 437 }
 438
 439 void Player::take_queue_spot()
 440 {
 441         unique_lock<mutex> lock(queue_state_mu);
 442         ++num_queued_frames;
 443 }
 444
 445 void Player::release_queue_spot()
 446 {
 447         unique_lock<mutex> lock(queue_state_mu);
 448         assert(num_queued_frames > 0);
 449         --num_queued_frames;
 450         new_clip_changed.notify_all();
 451 }