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         size_t next_clip_idx = size_t(-1);
  54         bool got_next_clip = false;
  55         double next_clip_fade_time = -1.0;
  56
  57         for ( ;; ) {
  58 wait_for_clip:
  59                 bool clip_ready;
  60                 steady_clock::time_point before_sleep = steady_clock::now();
  61
  62                 // Wait until we're supposed to play something.
  63                 {
  64                         unique_lock<mutex> lock(queue_state_mu);
  65                         clip_ready = new_clip_changed.wait_for(lock, milliseconds(100), [this] {
  66                                 return new_clip_ready && current_clip.pts_in != -1;
  67                         });
  68                         new_clip_ready = false;
  69                         playing = true;
  70                 }
  71
  72                 steady_clock::duration time_slept = steady_clock::now() - before_sleep;
  73                 pts += duration_cast<duration<size_t, TimebaseRatio>>(time_slept).count();
  74
  75                 if (!clip_ready) {
  76                         if (video_stream != nullptr) {
  77                                 video_stream->schedule_refresh_frame(steady_clock::now(), pts, /*display_func=*/nullptr, QueueSpotHolder());
  78                         }
  79                         continue;
  80                 }
  81
  82                 Clip clip;
  83                 size_t clip_idx;
  84                 unsigned stream_idx;
  85                 {
  86                         lock_guard<mutex> lock(mu);
  87                         clip = current_clip;
  88                         clip_idx = current_clip_idx;
  89                         stream_idx = current_stream_idx;
  90                 }
  91                 steady_clock::time_point origin = steady_clock::now();  // TODO: Add a 100 ms buffer for ramp-up?
  92                 int64_t in_pts_origin = clip.pts_in;
  93 got_clip:
  94                 int64_t out_pts_origin = pts;
  95
  96                 // Start playing exactly at a frame.
  97                 // TODO: Snap secondary (fade-to) clips in the same fashion
  98                 // so that we don't get jank here).
  99                 {
 100                         lock_guard<mutex> lock(frame_mu);
 101
 102                         // Find the first frame such that frame.pts <= in_pts.
 103                         auto it = lower_bound(frames[stream_idx].begin(),
 104                                 frames[stream_idx].end(),
 105                                 in_pts_origin);
 106                         if (it != frames[stream_idx].end()) {
 107                                 in_pts_origin = *it;
 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                         int secondary_stream_idx = -1;
 151                         int64_t secondary_pts = -1;
 152                         int64_t in_pts_secondary = -1;
 153                         float fade_alpha = 0.0f;
 154                         if (got_next_clip && time_left_this_clip <= next_clip_fade_time) {
 155                                 secondary_stream_idx = next_clip.stream_idx;
 156                                 in_pts_secondary = lrint(next_clip.pts_in + (next_clip_fade_time - time_left_this_clip) * TIMEBASE * speed);
 157                                 in_pts_secondary_for_progress = in_pts_secondary;
 158                                 fade_alpha = 1.0f - time_left_this_clip / next_clip_fade_time;
 159
 160                                 // If more than half-way through the fade, interpolate the next clip
 161                                 // instead of the current one, since it's more visible.
 162                                 if (fade_alpha >= 0.5f) {
 163                                         swap(primary_stream_idx, secondary_stream_idx);
 164                                         swap(in_pts, in_pts_secondary);
 165                                         fade_alpha = 1.0f - fade_alpha;
 166                                 }
 167
 168                                 int64_t in_pts_lower, in_pts_upper;
 169                                 bool ok = find_surrounding_frames(in_pts_secondary, secondary_stream_idx, &in_pts_lower, &in_pts_upper);
 170                                 if (ok) {
 171                                         secondary_pts = in_pts_lower;
 172                                 } else {
 173                                         secondary_stream_idx = -1;
 174                                 }
 175                         }
 176
 177                         if (progress_callback != nullptr) {
 178                                 // NOTE: None of this will take into account any snapping done below.
 179                                 double played_this_clip = double(in_pts_for_progress - clip.pts_in) / TIMEBASE / speed;
 180                                 double total_length = double(clip.pts_out - clip.pts_in) / TIMEBASE / speed;
 181                                 map<size_t, double> progress{{ clip_idx, played_this_clip / total_length }};
 182
 183                                 if (got_next_clip && time_left_this_clip <= next_clip_fade_time) {
 184                                         double played_next_clip = double(in_pts_secondary_for_progress - next_clip.pts_in) / TIMEBASE / speed;
 185                                         double total_next_length = double(next_clip.pts_out - next_clip.pts_in) / TIMEBASE / speed;
 186                                         progress[next_clip_idx] = played_next_clip / total_next_length;
 187                                 }
 188                                 progress_callback(progress);
 189                         }
 190
 191                         int64_t in_pts_lower, in_pts_upper;
 192                         bool ok = find_surrounding_frames(in_pts, primary_stream_idx, &in_pts_lower, &in_pts_upper);
 193                         if (!ok) {
 194                                 break;
 195                         }
 196
 197                         // If the queue is full (which is really the state we'd like to be in),
 198                         // wait until there's room for one more frame (ie., one was output from
 199                         // VideoStream), or until or until there's a new clip we're supposed to play.
 200                         {
 201                                 unique_lock<mutex> lock(queue_state_mu);
 202                                 new_clip_changed.wait(lock, [this]{
 203                                         if (video_stream != nullptr && num_queued_frames < max_queued_frames) {
 204                                                 return true;
 205                                         }
 206                                         return new_clip_ready || override_stream_idx != -1;
 207                                 });
 208                                 if (new_clip_ready) {
 209                                         if (video_stream != nullptr) {
 210                                                 lock.unlock();  // Urg.
 211                                                 video_stream->clear_queue();
 212                                                 lock.lock();
 213                                         }
 214                                         goto wait_for_clip;
 215                                 }
 216                                 if (override_stream_idx != -1) {
 217                                         stream_idx = override_stream_idx;
 218                                         override_stream_idx = -1;
 219                                         continue;
 220                                 }
 221                         }
 222
 223                         if (in_pts_lower == in_pts_upper) {
 224                                 auto display_func = [this, primary_stream_idx, in_pts_lower, secondary_stream_idx, secondary_pts, fade_alpha]{
 225                                         destination->setFrame(primary_stream_idx, in_pts_lower, /*interpolated=*/false, secondary_stream_idx, secondary_pts, fade_alpha);
 226                                 };
 227                                 if (video_stream == nullptr) {
 228                                         display_func();
 229                                 } else {
 230                                         if (secondary_stream_idx == -1) {
 231                                                 video_stream->schedule_original_frame(
 232                                                         next_frame_start, pts, display_func, QueueSpotHolder(this),
 233                                                         primary_stream_idx, in_pts_lower);
 234                                         } else {
 235                                                 video_stream->schedule_faded_frame(next_frame_start, pts, display_func,
 236                                                         QueueSpotHolder(this), primary_stream_idx, in_pts_lower,
 237                                                         secondary_stream_idx, secondary_pts, fade_alpha);
 238                                         }
 239                                 }
 240                                 continue;
 241                         }
 242
 243                         // Snap to input frame: If we can do so with less than 1% jitter
 244                         // (ie., move less than 1% of an _output_ frame), do so.
 245                         // TODO: Snap secondary (fade-to) clips in the same fashion.
 246                         bool snapped = false;
 247                         for (int64_t snap_pts : { in_pts_lower, in_pts_upper }) {
 248                                 double snap_pts_as_frameno = (snap_pts - in_pts_origin) * output_framerate / TIMEBASE / speed;
 249                                 if (fabs(snap_pts_as_frameno - frameno) < 0.01) {
 250                                         auto display_func = [this, primary_stream_idx, snap_pts, secondary_stream_idx, secondary_pts, fade_alpha]{
 251                                                 destination->setFrame(primary_stream_idx, snap_pts, /*interpolated=*/false, secondary_stream_idx, secondary_pts, fade_alpha);
 252                                         };
 253                                         if (video_stream == nullptr) {
 254                                                 display_func();
 255                                         } else {
 256                                                 if (secondary_stream_idx == -1) {
 257                                                         video_stream->schedule_original_frame(
 258                                                                 next_frame_start, pts, display_func,
 259                                                                 QueueSpotHolder(this), primary_stream_idx, snap_pts);
 260                                                 } else {
 261                                                         video_stream->schedule_faded_frame(
 262                                                                 next_frame_start, pts, display_func, QueueSpotHolder(this),
 263                                                                 primary_stream_idx, snap_pts, secondary_stream_idx, secondary_pts, fade_alpha);
 264                                                 }
 265                                         }
 266                                         in_pts_origin += snap_pts - in_pts;
 267                                         snapped = true;
 268                                         break;
 269                                 }
 270                         }
 271                         if (snapped) {
 272                                 continue;
 273                         }
 274
 275                         if (time_behind >= milliseconds(100)) {
 276                                 fprintf(stderr, "WARNING: %ld ms behind, dropping an interpolated frame.\n",
 277                                         lrint(1e3 * duration<double>(time_behind).count()));
 278                                 continue;
 279                         }
 280
 281                         double alpha = double(in_pts - in_pts_lower) / (in_pts_upper - in_pts_lower);
 282
 283                         if (video_stream == nullptr) {
 284                                 // Previews don't do any interpolation.
 285                                 assert(secondary_stream_idx == -1);
 286                                 destination->setFrame(primary_stream_idx, in_pts_lower, /*interpolated=*/false);
 287                         } else {
 288                                 auto display_func = [this, primary_stream_idx, pts, secondary_stream_idx, secondary_pts, fade_alpha]{
 289                                         destination->setFrame(primary_stream_idx, pts, /*interpolated=*/true, secondary_stream_idx, secondary_pts, fade_alpha);
 290                                 };
 291                                 video_stream->schedule_interpolated_frame(
 292                                         next_frame_start, pts, display_func, QueueSpotHolder(this),
 293                                         primary_stream_idx, in_pts_lower, in_pts_upper, alpha,
 294                                         secondary_stream_idx, secondary_pts, fade_alpha);
 295                         }
 296                 }
 297
 298                 // The clip ended.
 299
 300                 // Last-ditch effort to get the next clip (if e.g. the fade time was zero seconds).
 301                 if (!got_next_clip && next_clip_callback != nullptr) {
 302                         tie(next_clip, next_clip_idx) = next_clip_callback();
 303                         if (next_clip.pts_in != -1) {
 304                                 got_next_clip = true;
 305                                 in_pts_start_next_clip = next_clip.pts_in;
 306                         }
 307                 }
 308
 309                 // Switch to next clip if we got it.
 310                 if (got_next_clip) {
 311                         clip = next_clip;
 312                         clip_idx = next_clip_idx;
 313                         stream_idx = next_clip.stream_idx;  // Override is used for previews only, and next_clip is used for live ony.
 314                         if (done_callback != nullptr) {
 315                                 done_callback();
 316                         }
 317                         got_next_clip = false;
 318
 319                         // Start the next clip from the point where the fade went out.
 320                         origin = steady_clock::now();
 321                         in_pts_origin = in_pts_start_next_clip;
 322                         goto got_clip;
 323                 }
 324
 325                 {
 326                         unique_lock<mutex> lock(queue_state_mu);
 327                         playing = false;
 328                 }
 329                 if (done_callback != nullptr) {
 330                         done_callback();
 331                 }
 332         }
 333 }
 334
 335 // Find the frame immediately before and after this point.
 336 bool Player::find_surrounding_frames(int64_t pts, int stream_idx, int64_t *pts_lower, int64_t *pts_upper)
 337 {
 338         lock_guard<mutex> lock(frame_mu);
 339
 340         // Find the first frame such that frame.pts >= pts.
 341         auto it = lower_bound(frames[stream_idx].begin(),
 342                 frames[stream_idx].end(),
 343                 pts);
 344         if (it == frames[stream_idx].end()) {
 345                 return false;
 346         }
 347         *pts_upper = *it;
 348
 349         // Find the last frame such that in_pts <= frame.pts (if any).
 350         if (it == frames[stream_idx].begin()) {
 351                 *pts_lower = *it;
 352         } else {
 353                 *pts_lower = *(it - 1);
 354         }
 355         assert(pts >= *pts_lower);
 356         assert(pts <= *pts_upper);
 357         return true;
 358 }
 359
 360 Player::Player(JPEGFrameView *destination, bool also_output_to_stream)
 361         : destination(destination)
 362 {
 363         thread(&Player::thread_func, this, also_output_to_stream).detach();
 364 }
 365
 366 void Player::play_clip(const Clip &clip, size_t clip_idx, unsigned stream_idx)
 367 {
 368         {
 369                 lock_guard<mutex> lock(mu);
 370                 current_clip = clip;
 371                 current_stream_idx = stream_idx;
 372                 current_clip_idx = clip_idx;
 373         }
 374
 375         {
 376                 lock_guard<mutex> lock(queue_state_mu);
 377                 new_clip_ready = true;
 378                 override_stream_idx = -1;
 379                 new_clip_changed.notify_all();
 380         }
 381 }
 382
 383 void Player::override_angle(unsigned stream_idx)
 384 {
 385         // Corner case: If a new clip is waiting to be played, change its stream and then we're done.
 386         {
 387                 unique_lock<mutex> lock(queue_state_mu);
 388                 if (new_clip_ready) {
 389                         lock_guard<mutex> lock2(mu);
 390                         current_stream_idx = stream_idx;
 391                         return;
 392                 }
 393         }
 394
 395         // If we are playing a clip, set override_stream_idx, and the player thread will
 396         // pick it up and change its internal index.
 397         {
 398                 unique_lock<mutex> lock(queue_state_mu);
 399                 if (playing) {
 400                         override_stream_idx = stream_idx;
 401                         new_clip_changed.notify_all();
 402                 }
 403         }
 404
 405         // OK, so we're standing still, presumably at the end of a clip.
 406         // Look at the current pts_out (if it exists), and show the closest
 407         // thing we've got.
 408         int64_t pts_out;
 409         {
 410                 lock_guard<mutex> lock(mu);
 411                 if (current_clip.pts_out < 0) {
 412                         return;
 413                 }
 414                 pts_out = current_clip.pts_out;
 415         }
 416
 417         lock_guard<mutex> lock(frame_mu);
 418         auto it = upper_bound(frames[stream_idx].begin(), frames[stream_idx].end(), pts_out);
 419         if (it == frames[stream_idx].end()) {
 420                 return;
 421         }
 422         destination->setFrame(stream_idx, *it, /*interpolated=*/false);
 423 }
 424
 425 void Player::take_queue_spot()
 426 {
 427         unique_lock<mutex> lock(queue_state_mu);
 428         ++num_queued_frames;
 429 }
 430
 431 void Player::release_queue_spot()
 432 {
 433         unique_lock<mutex> lock(queue_state_mu);
 434         assert(num_queued_frames > 0);
 435         --num_queued_frames;
 436         new_clip_changed.notify_all();
 437 }