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                 bool clip_ready;
  58                 steady_clock::time_point before_sleep = steady_clock::now();
  59
  60                 // Wait until we're supposed to play something.
  61                 {
  62                         unique_lock<mutex> lock(queue_state_mu);
  63                         clip_ready = new_clip_changed.wait_for(lock, milliseconds(100), [this] {
  64                                 return new_clip_ready && current_clip.pts_in != -1;
  65                         });
  66                         new_clip_ready = false;
  67                         playing = true;
  68                 }
  69
  70                 steady_clock::duration time_slept = steady_clock::now() - before_sleep;
  71                 pts += duration_cast<duration<size_t, TimebaseRatio>>(time_slept).count();
  72
  73                 if (!clip_ready) {
  74                         if (video_stream != nullptr) {
  75                                 video_stream->schedule_refresh_frame(pts);
  76                         }
  77                         continue;
  78                 }
  79
  80                 Clip clip;
  81                 unsigned stream_idx;
  82                 {
  83                         lock_guard<mutex> lock(mu);
  84                         clip = current_clip;
  85                         stream_idx = current_stream_idx;
  86                 }
  87                 steady_clock::time_point origin = steady_clock::now();
  88                 int64_t in_pts_origin = clip.pts_in;
  89 got_clip:
  90                 int64_t out_pts_origin = pts;
  91
  92                 // Start playing exactly at a frame.
  93                 // TODO: Snap secondary (fade-to) clips in the same fashion
  94                 // so that we don't get jank here).
  95                 {
  96                         lock_guard<mutex> lock(frame_mu);
  97
  98                         // Find the first frame such that frame.pts <= in_pts.
  99                         auto it = lower_bound(frames[stream_idx].begin(),
 100                                 frames[stream_idx].end(),
 101                                 in_pts_origin);
 102                         if (it != frames[stream_idx].end()) {
 103                                 in_pts_origin = *it;
 104                         }
 105                 }
 106
 107                 // TODO: Lock to a rational multiple of the frame rate if possible.
 108                 double speed = 0.5;
 109
 110                 int64_t in_pts_start_next_clip = -1;
 111                 for (int frameno = 0; ; ++frameno) {  // Ends when the clip ends.
 112                         double out_pts = out_pts_origin + TIMEBASE * frameno / output_framerate;
 113                         steady_clock::time_point next_frame_start =
 114                                 origin + microseconds(lrint((out_pts - out_pts_origin) * 1e6 / TIMEBASE));
 115                         int64_t in_pts = lrint(in_pts_origin + TIMEBASE * frameno * speed / output_framerate);
 116                         pts = lrint(out_pts);
 117
 118                         if (in_pts >= clip.pts_out) {
 119                                 break;
 120                         }
 121
 122                         steady_clock::duration time_behind = steady_clock::now() - next_frame_start;
 123                         if (time_behind >= milliseconds(200)) {
 124                                 fprintf(stderr, "WARNING: %ld ms behind, dropping a frame (no matter the type).\n",
 125                                         lrint(1e3 * duration<double>(time_behind).count()));
 126                                 continue;
 127                         }
 128
 129                         double time_left_this_clip = double(clip.pts_out - in_pts) / TIMEBASE / speed;
 130                         if (!got_next_clip && next_clip_callback != nullptr && time_left_this_clip <= clip.fade_time_seconds) {
 131                                 // Find the next clip so that we can begin a fade.
 132                                 next_clip = next_clip_callback();
 133                                 if (next_clip.pts_in != -1) {
 134                                         got_next_clip = true;
 135
 136                                         double duration_next_clip = (next_clip.pts_out - next_clip.pts_in) / TIMEBASE / speed;
 137                                         next_clip_fade_time = std::min(time_left_this_clip, duration_next_clip);
 138                                         in_pts_start_next_clip = next_clip.pts_in + lrint(next_clip_fade_time * TIMEBASE * speed);
 139                                 }
 140                         }
 141
 142                         int primary_stream_idx = stream_idx;
 143                         int secondary_stream_idx = -1;
 144                         int64_t secondary_pts = -1;
 145                         int64_t in_pts_secondary = -1;
 146                         float fade_alpha = 0.0f;
 147                         if (got_next_clip) {
 148                                 secondary_stream_idx = next_clip.stream_idx;
 149                                 in_pts_secondary = lrint(next_clip.pts_in + (next_clip_fade_time - time_left_this_clip) * TIMEBASE * speed);
 150                                 fade_alpha = 1.0f - time_left_this_clip / next_clip_fade_time;
 151
 152                                 // If more than half-way through the fade, interpolate the next clip
 153                                 // instead of the current one, since it's more visible.
 154                                 if (fade_alpha >= 0.5f) {
 155                                         swap(primary_stream_idx, secondary_stream_idx);
 156                                         swap(in_pts, in_pts_secondary);
 157                                         fade_alpha = 1.0f - fade_alpha;
 158                                 }
 159
 160                                 int64_t in_pts_lower, in_pts_upper;
 161                                 bool ok = find_surrounding_frames(in_pts_secondary, secondary_stream_idx, &in_pts_lower, &in_pts_upper);
 162                                 if (ok) {
 163                                         secondary_pts = in_pts_lower;
 164                                 } else {
 165                                         secondary_stream_idx = -1;
 166                                 }
 167                         }
 168
 169                         if (progress_callback != nullptr) {
 170                                 // NOTE: None of this will take into account any snapping done below.
 171                                 double played_this_clip = double(in_pts - clip.pts_in) / TIMEBASE / speed;
 172                                 double total_length = double(clip.pts_out - clip.pts_in) / TIMEBASE / speed;
 173                                 progress_callback(played_this_clip, total_length);
 174                         }
 175
 176                         int64_t in_pts_lower, in_pts_upper;
 177                         bool ok = find_surrounding_frames(in_pts, primary_stream_idx, &in_pts_lower, &in_pts_upper);
 178                         if (!ok) {
 179                                 break;
 180                         }
 181
 182                         // Sleep until the next frame start, or until there's a new clip we're supposed to play.
 183                         {
 184                                 unique_lock<mutex> lock(queue_state_mu);
 185                                 new_clip_changed.wait_until(lock, next_frame_start, [this]{
 186                                         return new_clip_ready || override_stream_idx != -1;
 187                                 });
 188                                 if (new_clip_ready) break;
 189                                 if (override_stream_idx != -1) {
 190                                         stream_idx = override_stream_idx;
 191                                         override_stream_idx = -1;
 192                                         continue;
 193                                 }
 194                         }
 195
 196                         if (in_pts_lower == in_pts_upper) {
 197                                 destination->setFrame(primary_stream_idx, in_pts_lower, /*interpolated=*/false, secondary_stream_idx, secondary_pts, fade_alpha);
 198                                 if (video_stream != nullptr) {
 199                                         if (secondary_stream_idx == -1) {
 200                                                 video_stream->schedule_original_frame(pts, primary_stream_idx, in_pts_lower);
 201                                         } else {
 202                                                 video_stream->schedule_faded_frame(pts, primary_stream_idx, in_pts_lower, secondary_stream_idx, secondary_pts, fade_alpha);
 203                                         }
 204                                 }
 205                                 continue;
 206                         }
 207
 208                         // Snap to input frame: If we can do so with less than 1% jitter
 209                         // (ie., move less than 1% of an _output_ frame), do so.
 210                         // TODO: Snap secondary (fade-to) clips in the same fashion.
 211                         bool snapped = false;
 212                         for (int64_t snap_pts : { in_pts_lower, in_pts_upper }) {
 213                                 double snap_pts_as_frameno = (snap_pts - in_pts_origin) * output_framerate / TIMEBASE / speed;
 214                                 if (fabs(snap_pts_as_frameno - frameno) < 0.01) {
 215                                         destination->setFrame(primary_stream_idx, snap_pts, /*interpolated=*/false, secondary_stream_idx, secondary_pts, fade_alpha);
 216                                         if (video_stream != nullptr) {
 217                                                 if (secondary_stream_idx == -1) {
 218                                                         video_stream->schedule_original_frame(pts, primary_stream_idx, snap_pts);
 219                                                 } else {
 220                                                         video_stream->schedule_faded_frame(pts, primary_stream_idx, snap_pts, secondary_stream_idx, secondary_pts, fade_alpha);
 221                                                 }
 222                                         }
 223                                         in_pts_origin += snap_pts - in_pts;
 224                                         snapped = true;
 225                                         break;
 226                                 }
 227                         }
 228                         if (snapped) {
 229                                 continue;
 230                         }
 231
 232                         if (time_behind >= milliseconds(100)) {
 233                                 fprintf(stderr, "WARNING: %ld ms behind, dropping an interpolated frame.\n",
 234                                         lrint(1e3 * duration<double>(time_behind).count()));
 235                                 continue;
 236                         }
 237
 238                         double alpha = double(in_pts - in_pts_lower) / (in_pts_upper - in_pts_lower);
 239
 240                         if (video_stream == nullptr) {
 241                                 // Previews don't do any interpolation.
 242                                 assert(secondary_stream_idx == -1);
 243                                 destination->setFrame(primary_stream_idx, in_pts_lower, /*interpolated=*/false);
 244                         } else {
 245                                 // Calculate the interpolated frame. When it's done, the destination
 246                                 // will be unblocked.
 247                                 destination->setFrame(primary_stream_idx, pts, /*interpolated=*/true, secondary_stream_idx, secondary_pts, fade_alpha);
 248                                 video_stream->schedule_interpolated_frame(pts, primary_stream_idx, in_pts_lower, in_pts_upper, alpha, secondary_stream_idx, secondary_pts, fade_alpha);
 249                         }
 250                 }
 251
 252                 // The clip ended.
 253
 254                 // Last-ditch effort to get the next clip (if e.g. the fade time was zero seconds).
 255                 if (!got_next_clip && next_clip_callback != nullptr) {
 256                         next_clip = next_clip_callback();
 257                         if (next_clip.pts_in != -1) {
 258                                 got_next_clip = true;
 259                                 in_pts_start_next_clip = next_clip.pts_in;
 260                         }
 261                 }
 262
 263                 // Switch to next clip if we got it.
 264                 if (got_next_clip) {
 265                         clip = next_clip;
 266                         stream_idx = next_clip.stream_idx;  // Override is used for previews only, and next_clip is used for live ony.
 267                         if (done_callback != nullptr) {
 268                                 done_callback();
 269                         }
 270                         got_next_clip = false;
 271
 272                         // Start the next clip from the point where the fade went out.
 273                         origin = steady_clock::now();
 274                         in_pts_origin = in_pts_start_next_clip;
 275                         goto got_clip;
 276                 }
 277
 278                 {
 279                         unique_lock<mutex> lock(queue_state_mu);
 280                         playing = false;
 281                 }
 282                 if (done_callback != nullptr) {
 283                         done_callback();
 284                 }
 285         }
 286 }
 287
 288 // Find the frame immediately before and after this point.
 289 bool Player::find_surrounding_frames(int64_t pts, int stream_idx, int64_t *pts_lower, int64_t *pts_upper)
 290 {
 291         lock_guard<mutex> lock(frame_mu);
 292
 293         // Find the first frame such that frame.pts >= pts.
 294         auto it = lower_bound(frames[stream_idx].begin(),
 295                 frames[stream_idx].end(),
 296                 pts);
 297         if (it == frames[stream_idx].end()) {
 298                 return false;
 299         }
 300         *pts_upper = *it;
 301
 302         // Find the last frame such that in_pts <= frame.pts (if any).
 303         if (it == frames[stream_idx].begin()) {
 304                 *pts_lower = *it;
 305         } else {
 306                 *pts_lower = *(it - 1);
 307         }
 308         assert(pts >= *pts_lower);
 309         assert(pts <= *pts_upper);
 310         return true;
 311 }
 312
 313 Player::Player(JPEGFrameView *destination, bool also_output_to_stream)
 314         : destination(destination)
 315 {
 316         thread(&Player::thread_func, this, also_output_to_stream).detach();
 317 }
 318
 319 void Player::play_clip(const Clip &clip, unsigned stream_idx)
 320 {
 321         {
 322                 lock_guard<mutex> lock(mu);
 323                 current_clip = clip;
 324                 current_stream_idx = stream_idx;
 325         }
 326
 327         {
 328                 lock_guard<mutex> lock(queue_state_mu);
 329                 new_clip_ready = true;
 330                 override_stream_idx = -1;
 331                 new_clip_changed.notify_all();
 332         }
 333 }
 334
 335 void Player::override_angle(unsigned stream_idx)
 336 {
 337         // Corner case: If a new clip is waiting to be played, change its stream and then we're done.
 338         {
 339                 unique_lock<mutex> lock(queue_state_mu);
 340                 if (new_clip_ready) {
 341                         lock_guard<mutex> lock2(mu);
 342                         current_stream_idx = stream_idx;
 343                         return;
 344                 }
 345         }
 346
 347         // If we are playing a clip, set override_stream_idx, and the player thread will
 348         // pick it up and change its internal index.
 349         {
 350                 unique_lock<mutex> lock(queue_state_mu);
 351                 if (playing) {
 352                         override_stream_idx = stream_idx;
 353                         new_clip_changed.notify_all();
 354                 }
 355         }
 356
 357         // OK, so we're standing still, presumably at the end of a clip.
 358         // Look at the current pts_out (if it exists), and show the closest
 359         // thing we've got.
 360         int64_t pts_out;
 361         {
 362                 lock_guard<mutex> lock(mu);
 363                 if (current_clip.pts_out < 0) {
 364                         return;
 365                 }
 366                 pts_out = current_clip.pts_out;
 367         }
 368
 369         lock_guard<mutex> lock(frame_mu);
 370         auto it = upper_bound(frames[stream_idx].begin(), frames[stream_idx].end(), pts_out);
 371         if (it == frames[stream_idx].end()) {
 372                 return;
 373         }
 374         destination->setFrame(stream_idx, *it, /*interpolated=*/false);
 375 }