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 "httpd.h"
   8 #include "jpeg_frame_view.h"
   9 #include "mux.h"
  10 #include "timebase.h"
  11 #include "video_stream.h"
  12
  13 #include <algorithm>
  14 #include <chrono>
  15 #include <condition_variable>
  16 #include <movit/util.h>
  17 #include <mutex>
  18 #include <stdio.h>
  19 #include <thread>
  20 #include <vector>
  21
  22 using namespace std;
  23 using namespace std::chrono;
  24
  25 extern mutex frame_mu;
  26 extern vector<int64_t> frames[MAX_STREAMS];
  27 extern HTTPD *global_httpd;
  28
  29 void Player::thread_func(bool also_output_to_stream)
  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 (also_output_to_stream) {
  44                 video_stream.reset(new VideoStream);
  45                 video_stream->start();
  46         }
  47
  48         check_error();
  49
  50         constexpr double output_framerate = 60000.0 / 1001.0;  // FIXME: make configurable
  51         int64_t pts = 0;
  52         Clip next_clip;
  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                 unsigned stream_idx;
  83                 {
  84                         lock_guard<mutex> lock(mu);
  85                         clip = current_clip;
  86                         stream_idx = current_stream_idx;
  87                 }
  88                 steady_clock::time_point origin = steady_clock::now();  // TODO: Add a 100 ms buffer for ramp-up?
  89                 int64_t in_pts_origin = clip.pts_in;
  90 got_clip:
  91                 int64_t out_pts_origin = pts;
  92
  93                 // Start playing exactly at a frame.
  94                 // TODO: Snap secondary (fade-to) clips in the same fashion
  95                 // so that we don't get jank here).
  96                 {
  97                         lock_guard<mutex> lock(frame_mu);
  98
  99                         // Find the first frame such that frame.pts <= in_pts.
 100                         auto it = lower_bound(frames[stream_idx].begin(),
 101                                 frames[stream_idx].end(),
 102                                 in_pts_origin);
 103                         if (it != frames[stream_idx].end()) {
 104                                 in_pts_origin = *it;
 105                         }
 106                 }
 107
 108                 // TODO: Lock to a rational multiple of the frame rate if possible.
 109                 double speed = 0.5;
 110
 111                 int64_t in_pts_start_next_clip = -1;
 112                 for (int frameno = 0; ; ++frameno) {  // Ends when the clip ends.
 113                         double out_pts = out_pts_origin + TIMEBASE * frameno / output_framerate;
 114                         steady_clock::time_point next_frame_start =
 115                                 origin + microseconds(lrint((out_pts - out_pts_origin) * 1e6 / TIMEBASE));
 116                         int64_t in_pts = lrint(in_pts_origin + TIMEBASE * frameno * speed / output_framerate);
 117                         pts = lrint(out_pts);
 118
 119                         if (in_pts >= clip.pts_out) {
 120                                 break;
 121                         }
 122
 123                         steady_clock::duration time_behind = steady_clock::now() - next_frame_start;
 124                         if (time_behind >= milliseconds(200)) {
 125                                 fprintf(stderr, "WARNING: %ld ms behind, dropping a frame (no matter the type).\n",
 126                                         lrint(1e3 * duration<double>(time_behind).count()));
 127                                 continue;
 128                         }
 129
 130                         double time_left_this_clip = double(clip.pts_out - in_pts) / TIMEBASE / speed;
 131                         if (!got_next_clip && next_clip_callback != nullptr && time_left_this_clip <= clip.fade_time_seconds) {
 132                                 // Find the next clip so that we can begin a fade.
 133                                 next_clip = next_clip_callback();
 134                                 if (next_clip.pts_in != -1) {
 135                                         got_next_clip = true;
 136
 137                                         double duration_next_clip = (next_clip.pts_out - next_clip.pts_in) / TIMEBASE / speed;
 138                                         next_clip_fade_time = std::min(time_left_this_clip, duration_next_clip);
 139                                         in_pts_start_next_clip = next_clip.pts_in + lrint(next_clip_fade_time * TIMEBASE * speed);
 140                                 }
 141                         }
 142
 143                         int primary_stream_idx = stream_idx;
 144                         int secondary_stream_idx = -1;
 145                         int64_t secondary_pts = -1;
 146                         int64_t in_pts_secondary = -1;
 147                         float fade_alpha = 0.0f;
 148                         if (got_next_clip && time_left_this_clip <= next_clip_fade_time) {
 149                                 secondary_stream_idx = next_clip.stream_idx;
 150                                 in_pts_secondary = lrint(next_clip.pts_in + (next_clip_fade_time - time_left_this_clip) * TIMEBASE * speed);
 151                                 fade_alpha = 1.0f - time_left_this_clip / next_clip_fade_time;
 152
 153                                 // If more than half-way through the fade, interpolate the next clip
 154                                 // instead of the current one, since it's more visible.
 155                                 if (fade_alpha >= 0.5f) {
 156                                         swap(primary_stream_idx, secondary_stream_idx);
 157                                         swap(in_pts, in_pts_secondary);
 158                                         fade_alpha = 1.0f - fade_alpha;
 159                                 }
 160
 161                                 int64_t in_pts_lower, in_pts_upper;
 162                                 bool ok = find_surrounding_frames(in_pts_secondary, secondary_stream_idx, &in_pts_lower, &in_pts_upper);
 163                                 if (ok) {
 164                                         secondary_pts = in_pts_lower;
 165                                 } else {
 166                                         secondary_stream_idx = -1;
 167                                 }
 168                         }
 169
 170                         if (progress_callback != nullptr) {
 171                                 // NOTE: None of this will take into account any snapping done below.
 172                                 double played_this_clip = double(in_pts - clip.pts_in) / TIMEBASE / speed;
 173                                 double total_length = double(clip.pts_out - clip.pts_in) / TIMEBASE / speed;
 174                                 progress_callback(played_this_clip, total_length);
 175                         }
 176
 177                         int64_t in_pts_lower, in_pts_upper;
 178                         bool ok = find_surrounding_frames(in_pts, primary_stream_idx, &in_pts_lower, &in_pts_upper);
 179                         if (!ok) {
 180                                 break;
 181                         }
 182
 183                         // If the queue is full (which is really the state we'd like to be in),
 184                         // wait until there's room for one more frame (ie., one was output from
 185                         // VideoStream), or until or until there's a new clip we're supposed to play.
 186                         {
 187                                 unique_lock<mutex> lock(queue_state_mu);
 188                                 new_clip_changed.wait(lock, [this]{
 189                                         if (video_stream != nullptr && num_queued_frames < max_queued_frames) {
 190                                                 return true;
 191                                         }
 192                                         return new_clip_ready || override_stream_idx != -1;
 193                                 });
 194                                 if (new_clip_ready) {
 195                                         if (video_stream != nullptr) {
 196                                                 lock.unlock();  // Urg.
 197                                                 video_stream->clear_queue();
 198                                                 lock.lock();
 199                                         }
 200                                         goto wait_for_clip;
 201                                 }
 202                                 if (override_stream_idx != -1) {
 203                                         stream_idx = override_stream_idx;
 204                                         override_stream_idx = -1;
 205                                         continue;
 206                                 }
 207                         }
 208
 209                         if (in_pts_lower == in_pts_upper) {
 210                                 auto display_func = [this, primary_stream_idx, in_pts_lower, secondary_stream_idx, secondary_pts, fade_alpha]{
 211                                         destination->setFrame(primary_stream_idx, in_pts_lower, /*interpolated=*/false, secondary_stream_idx, secondary_pts, fade_alpha);
 212                                 };
 213                                 if (video_stream == nullptr) {
 214                                         display_func();
 215                                 } else {
 216                                         if (secondary_stream_idx == -1) {
 217                                                 video_stream->schedule_original_frame(
 218                                                         next_frame_start, pts, display_func, QueueSpotHolder(this),
 219                                                         primary_stream_idx, in_pts_lower);
 220                                         } else {
 221                                                 video_stream->schedule_faded_frame(next_frame_start, pts, display_func,
 222                                                         QueueSpotHolder(this), primary_stream_idx, in_pts_lower,
 223                                                         secondary_stream_idx, secondary_pts, fade_alpha);
 224                                         }
 225                                 }
 226                                 continue;
 227                         }
 228
 229                         // Snap to input frame: If we can do so with less than 1% jitter
 230                         // (ie., move less than 1% of an _output_ frame), do so.
 231                         // TODO: Snap secondary (fade-to) clips in the same fashion.
 232                         bool snapped = false;
 233                         for (int64_t snap_pts : { in_pts_lower, in_pts_upper }) {
 234                                 double snap_pts_as_frameno = (snap_pts - in_pts_origin) * output_framerate / TIMEBASE / speed;
 235                                 if (fabs(snap_pts_as_frameno - frameno) < 0.01) {
 236                                         auto display_func = [this, primary_stream_idx, snap_pts, secondary_stream_idx, secondary_pts, fade_alpha]{
 237                                                 destination->setFrame(primary_stream_idx, snap_pts, /*interpolated=*/false, secondary_stream_idx, secondary_pts, fade_alpha);
 238                                         };
 239                                         if (video_stream == nullptr) {
 240                                                 display_func();
 241                                         } else {
 242                                                 if (secondary_stream_idx == -1) {
 243                                                         video_stream->schedule_original_frame(
 244                                                                 next_frame_start, pts, display_func,
 245                                                                 QueueSpotHolder(this), primary_stream_idx, snap_pts);
 246                                                 } else {
 247                                                         video_stream->schedule_faded_frame(
 248                                                                 next_frame_start, pts, display_func, QueueSpotHolder(this),
 249                                                                 primary_stream_idx, snap_pts, secondary_stream_idx, secondary_pts, fade_alpha);
 250                                                 }
 251                                         }
 252                                         in_pts_origin += snap_pts - in_pts;
 253                                         snapped = true;
 254                                         break;
 255                                 }
 256                         }
 257                         if (snapped) {
 258                                 continue;
 259                         }
 260
 261                         if (time_behind >= milliseconds(100)) {
 262                                 fprintf(stderr, "WARNING: %ld ms behind, dropping an interpolated frame.\n",
 263                                         lrint(1e3 * duration<double>(time_behind).count()));
 264                                 continue;
 265                         }
 266
 267                         double alpha = double(in_pts - in_pts_lower) / (in_pts_upper - in_pts_lower);
 268
 269                         if (video_stream == nullptr) {
 270                                 // Previews don't do any interpolation.
 271                                 assert(secondary_stream_idx == -1);
 272                                 destination->setFrame(primary_stream_idx, in_pts_lower, /*interpolated=*/false);
 273                         } else {
 274                                 auto display_func = [this, primary_stream_idx, pts, secondary_stream_idx, secondary_pts, fade_alpha]{
 275                                         destination->setFrame(primary_stream_idx, pts, /*interpolated=*/true, secondary_stream_idx, secondary_pts, fade_alpha);
 276                                 };
 277                                 video_stream->schedule_interpolated_frame(
 278                                         next_frame_start, pts, display_func, QueueSpotHolder(this),
 279                                         primary_stream_idx, in_pts_lower, in_pts_upper, alpha,
 280                                         secondary_stream_idx, secondary_pts, fade_alpha);
 281                         }
 282                 }
 283
 284                 // The clip ended.
 285
 286                 // Last-ditch effort to get the next clip (if e.g. the fade time was zero seconds).
 287                 if (!got_next_clip && next_clip_callback != nullptr) {
 288                         next_clip = next_clip_callback();
 289                         if (next_clip.pts_in != -1) {
 290                                 got_next_clip = true;
 291                                 in_pts_start_next_clip = next_clip.pts_in;
 292                         }
 293                 }
 294
 295                 // Switch to next clip if we got it.
 296                 if (got_next_clip) {
 297                         clip = next_clip;
 298                         stream_idx = next_clip.stream_idx;  // Override is used for previews only, and next_clip is used for live ony.
 299                         if (done_callback != nullptr) {
 300                                 done_callback();
 301                         }
 302                         got_next_clip = false;
 303
 304                         // Start the next clip from the point where the fade went out.
 305                         origin = steady_clock::now();
 306                         in_pts_origin = in_pts_start_next_clip;
 307                         goto got_clip;
 308                 }
 309
 310                 {
 311                         unique_lock<mutex> lock(queue_state_mu);
 312                         playing = false;
 313                 }
 314                 if (done_callback != nullptr) {
 315                         done_callback();
 316                 }
 317         }
 318 }
 319
 320 // Find the frame immediately before and after this point.
 321 bool Player::find_surrounding_frames(int64_t pts, int stream_idx, int64_t *pts_lower, int64_t *pts_upper)
 322 {
 323         lock_guard<mutex> lock(frame_mu);
 324
 325         // Find the first frame such that frame.pts >= pts.
 326         auto it = lower_bound(frames[stream_idx].begin(),
 327                 frames[stream_idx].end(),
 328                 pts);
 329         if (it == frames[stream_idx].end()) {
 330                 return false;
 331         }
 332         *pts_upper = *it;
 333
 334         // Find the last frame such that in_pts <= frame.pts (if any).
 335         if (it == frames[stream_idx].begin()) {
 336                 *pts_lower = *it;
 337         } else {
 338                 *pts_lower = *(it - 1);
 339         }
 340         assert(pts >= *pts_lower);
 341         assert(pts <= *pts_upper);
 342         return true;
 343 }
 344
 345 Player::Player(JPEGFrameView *destination, bool also_output_to_stream)
 346         : destination(destination)
 347 {
 348         thread(&Player::thread_func, this, also_output_to_stream).detach();
 349 }
 350
 351 void Player::play_clip(const Clip &clip, unsigned stream_idx)
 352 {
 353         {
 354                 lock_guard<mutex> lock(mu);
 355                 current_clip = clip;
 356                 current_stream_idx = stream_idx;
 357         }
 358
 359         {
 360                 lock_guard<mutex> lock(queue_state_mu);
 361                 new_clip_ready = true;
 362                 override_stream_idx = -1;
 363                 new_clip_changed.notify_all();
 364         }
 365 }
 366
 367 void Player::override_angle(unsigned stream_idx)
 368 {
 369         // Corner case: If a new clip is waiting to be played, change its stream and then we're done.
 370         {
 371                 unique_lock<mutex> lock(queue_state_mu);
 372                 if (new_clip_ready) {
 373                         lock_guard<mutex> lock2(mu);
 374                         current_stream_idx = stream_idx;
 375                         return;
 376                 }
 377         }
 378
 379         // If we are playing a clip, set override_stream_idx, and the player thread will
 380         // pick it up and change its internal index.
 381         {
 382                 unique_lock<mutex> lock(queue_state_mu);
 383                 if (playing) {
 384                         override_stream_idx = stream_idx;
 385                         new_clip_changed.notify_all();
 386                 }
 387         }
 388
 389         // OK, so we're standing still, presumably at the end of a clip.
 390         // Look at the current pts_out (if it exists), and show the closest
 391         // thing we've got.
 392         int64_t pts_out;
 393         {
 394                 lock_guard<mutex> lock(mu);
 395                 if (current_clip.pts_out < 0) {
 396                         return;
 397                 }
 398                 pts_out = current_clip.pts_out;
 399         }
 400
 401         lock_guard<mutex> lock(frame_mu);
 402         auto it = upper_bound(frames[stream_idx].begin(), frames[stream_idx].end(), pts_out);
 403         if (it == frames[stream_idx].end()) {
 404                 return;
 405         }
 406         destination->setFrame(stream_idx, *it, /*interpolated=*/false);
 407 }
 408
 409 void Player::take_queue_spot()
 410 {
 411         unique_lock<mutex> lock(queue_state_mu);
 412         ++num_queued_frames;
 413 }
 414
 415 void Player::release_queue_spot()
 416 {
 417         unique_lock<mutex> lock(queue_state_mu);
 418         assert(num_queued_frames > 0);
 419         --num_queued_frames;
 420         new_clip_changed.notify_all();
 421 }