Panda3D

ffmpegVideoCursor.cxx
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1 /**
2 * PANDA 3D SOFTWARE
3 * Copyright (c) Carnegie Mellon University. All rights reserved.
4 *
5 * All use of this software is subject to the terms of the revised BSD
6 * license. You should have received a copy of this license along
7 * with this source code in a file named "LICENSE."
8 *
9 * @file ffmpegVideoCursor.cxx
10 * @author jyelon
11 * @date 2007-08-01
12 */
13
14 #include "ffmpegVideoCursor.h"
15 #include "config_ffmpeg.h"
16 #include "pStatCollector.h"
17 #include "pStatTimer.h"
18 #include "mutexHolder.h"
19 #include "reMutexHolder.h"
20 #include "ffmpegVideo.h"
21 #include "bamReader.h"
22 extern "C" {
23 #include <libavcodec/avcodec.h>
24 #include <libavformat/avformat.h>
25 #include <libavutil/pixdesc.h>
26 #ifdef HAVE_SWSCALE
27 #include <libswscale/swscale.h>
28 #endif
29 }
30
31 ReMutex FfmpegVideoCursor::_av_lock;
32 TypeHandle FfmpegVideoCursor::_type_handle;
33 TypeHandle FfmpegVideoCursor::FfmpegBuffer::_type_handle;
34
35 PStatCollector FfmpegVideoCursor::_fetch_buffer_pcollector("*:FFMPEG Video Decoding:Fetch");
36 PStatCollector FfmpegVideoCursor::_seek_pcollector("*:FFMPEG Video Decoding:Seek");
37 PStatCollector FfmpegVideoCursor::_export_frame_pcollector("*:FFMPEG Convert Video to BGR");
38
39 #if LIBAVUTIL_VERSION_INT < AV_VERSION_INT(52, 32, 100)
40 #define AV_PIX_FMT_FLAG_ALPHA PIX_FMT_ALPHA
41 #endif
42
43 /**
44 * This constructor is only used when reading from a bam file.
45 */
46 FfmpegVideoCursor::
47 FfmpegVideoCursor() :
48 _max_readahead_frames(0),
49 _thread_priority(ffmpeg_thread_priority),
50 _lock("FfmpegVideoCursor::_lock"),
51 _action_cvar(_lock),
52 _thread_status(TS_stopped),
53 _seek_frame(0),
54 _packet(nullptr),
55 _format_ctx(nullptr),
56 _video_ctx(nullptr),
57 _convert_ctx(nullptr),
58 _pixel_format((int)AV_PIX_FMT_NONE),
59 _video_index(-1),
60 _frame(nullptr),
61 _frame_out(nullptr),
62 _eof_known(false)
63 {
64 }
65
66 /**
67 * Specifies the source of the video cursor. This is normally called only by
68 * the constructor or when reading from a bam file.
69 */
70 void FfmpegVideoCursor::
71 init_from(FfmpegVideo *source) {
72 nassertv(_thread == nullptr && _thread_status == TS_stopped);
73 nassertv(source != nullptr);
74 _source = source;
75 _filename = _source->get_filename();
76
77 if (!open_stream()) {
78 cleanup();
79 return;
80 }
81
82 #if LIBAVCODEC_VERSION_INT >= AV_VERSION_INT(55, 45, 101)
83 _frame = av_frame_alloc();
84 _frame_out = av_frame_alloc();
85 #else
86 _frame = avcodec_alloc_frame();
87 _frame_out = avcodec_alloc_frame();
88 #endif
89
90 if ((_frame == nullptr)||(_frame_out == nullptr)) {
91 cleanup();
92 return;
93 }
94
95 #if LIBAVCODEC_VERSION_INT >= AV_VERSION_INT(57, 12, 100)
96 _packet = av_packet_alloc();
97 #else
98 _packet = new AVPacket;
99 av_init_packet(_packet);
100 #endif
101
102 fetch_packet(0);
103 fetch_frame(-1);
104 _initial_dts = _begin_frame;
105
106 _current_frame = -1;
107 _eof_known = false;
108 _eof_frame = 0;
109
110 ReMutexHolder av_holder(_av_lock);
111
112 // Check if we got an alpha format. Please note that some video codecs
113 // (eg. libvpx) change the pix_fmt after decoding the first frame, which is
114 // why we didn't do this earlier.
115 switch (_video_ctx->pix_fmt) {
116 case AV_PIX_FMT_GRAY8:
117 _num_components = 1;
118 _pixel_format = (int)AV_PIX_FMT_GRAY8;
119 break;
120 case AV_PIX_FMT_Y400A: // aka AV_PIX_FMT_YA8
121 _num_components = 2;
122 _pixel_format = (int)AV_PIX_FMT_Y400A;
123 break;
124 default:
125 const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(_video_ctx->pix_fmt);
126 if (desc && (desc->flags & AV_PIX_FMT_FLAG_ALPHA) != 0) {
127 _num_components = 4;
128 _pixel_format = (int)AV_PIX_FMT_BGRA;
129 } else {
130 _num_components = 3;
131 _pixel_format = (int)AV_PIX_FMT_BGR24;
132 }
133 break;
134 }
135
136 #ifdef HAVE_SWSCALE
137 nassertv(_convert_ctx == nullptr);
138 _convert_ctx = sws_getContext(_size_x, _size_y, _video_ctx->pix_fmt,
139 _size_x, _size_y, (AVPixelFormat)_pixel_format,
140 SWS_BILINEAR | SWS_PRINT_INFO, nullptr, nullptr, nullptr);
141 #endif // HAVE_SWSCALE
142
143 #ifdef HAVE_THREADS
144 set_max_readahead_frames(ffmpeg_max_readahead_frames);
145 #endif // HAVE_THREADS
146 }
147
148 /**
149 *
150 */
151 FfmpegVideoCursor::
152 FfmpegVideoCursor(FfmpegVideo *src) :
153 _max_readahead_frames(0),
154 _thread_priority(ffmpeg_thread_priority),
155 _lock("FfmpegVideoCursor::_lock"),
156 _action_cvar(_lock),
157 _thread_status(TS_stopped),
158 _seek_frame(0),
159 _packet(nullptr),
160 _format_ctx(nullptr),
161 _video_ctx(nullptr),
162 _convert_ctx(nullptr),
163 _video_index(-1),
164 _frame(nullptr),
165 _frame_out(nullptr),
166 _eof_known(false)
167 {
168 init_from(src);
169 }
170
171 /**
172 *
173 */
174 FfmpegVideoCursor::
175 ~FfmpegVideoCursor() {
176 cleanup();
177 }
178
179 /**
180 * Specifies the maximum number of frames that a sub-thread will attempt to
181 * read ahead of the current frame. Setting this to a nonzero allows the
182 * video decoding to take place in a sub-thread, which smoothes out the video
183 * decoding time by spreading it evenly over several frames. Set this number
184 * larger to increase the buffer between the currently visible frame and the
185 * first undecoded frame; set it smaller to reduce memory consumption.
186 *
187 * Setting this to zero forces the video to be decoded in the main thread. If
188 * threading is not available in the Panda build, this value is always zero.
189 */
190 void FfmpegVideoCursor::
191 set_max_readahead_frames(int max_readahead_frames) {
192 #ifndef HAVE_THREADS
193 if (max_readahead_frames > 0) {
194 ffmpeg_cat.warning()
195 << "Couldn't set max_readahead_frames to " << max_readahead_frames
196 << ": threading not available.\n";
197 max_readahead_frames = 0;
198 }
199 #endif // HAVE_THREADS
200
201 _max_readahead_frames = max_readahead_frames;
202 if (_max_readahead_frames > 0) {
203 if (_thread_status == TS_stopped) {
204 start_thread();
205 }
206 } else {
207 if (_thread_status != TS_stopped) {
208 stop_thread();
209 }
210 }
211 }
212
213 /**
214 * Returns the maximum number of frames that a sub-thread will attempt to read
215 * ahead of the current frame. See set_max_readahead_frames().
216 */
217 int FfmpegVideoCursor::
218 get_max_readahead_frames() const {
219 return _max_readahead_frames;
220 }
221
222 /**
223 * Changes the thread priority of the thread that decodes the ffmpeg video
224 * stream (if max_readahead_frames is nonzero). Normally you shouldn't mess
225 * with this, but there may be special cases where a precise balance of CPU
226 * utilization between the main thread and the various ffmpeg service threads
227 * may be needed.
228 */
229 void FfmpegVideoCursor::
230 set_thread_priority(ThreadPriority thread_priority) {
231 if (_thread_priority != thread_priority) {
232 _thread_priority = thread_priority;
233 if (is_thread_started()) {
234 stop_thread();
235 start_thread();
236 }
237 }
238 }
239
240 /**
241 * Returns the current thread priority of the thread that decodes the ffmpeg
242 * video stream (if max_readahead_frames is nonzero). See
243 * set_thread_priority().
244 */
245 ThreadPriority FfmpegVideoCursor::
246 get_thread_priority() const {
247 return _thread_priority;
248 }
249
250 /**
251 * Explicitly starts the ffmpeg decoding thread after it has been stopped by a
252 * call to stop_thread(). The thread is normally started automatically, so
253 * there is no need to call this method unless you have previously called
254 * stop_thread() for some reason.
255 */
256 void FfmpegVideoCursor::
257 start_thread() {
258 MutexHolder holder(_lock);
259
260 if (_thread_status == TS_stopped && _max_readahead_frames > 0) {
261 // Get a unique name for the thread's sync name.
262 std::ostringstream strm;
263 strm << (void *)this;
264 _sync_name = strm.str();
265
266 // Create and start the thread object.
267 _thread_status = TS_wait;
268 _thread = new GenericThread(_filename.get_basename(), _sync_name, st_thread_main, this);
269 if (!_thread->start(_thread_priority, true)) {
270 // Couldn't start the thread.
271 _thread = nullptr;
272 _thread_status = TS_stopped;
273 }
274 }
275 }
276
277 /**
278 * Explicitly stops the ffmpeg decoding thread. There is normally no reason
279 * to do this unless you want to maintain precise control over what threads
280 * are consuming CPU resources. Calling this method will make the video
281 * update in the main thread, regardless of the setting of
282 * max_readahead_frames, until you call start_thread() again.
283 */
284 void FfmpegVideoCursor::
285 stop_thread() {
286 if (_thread_status != TS_stopped) {
287 PT(GenericThread) thread = _thread;
288 {
289 MutexHolder holder(_lock);
290 if (_thread_status != TS_stopped) {
291 _thread_status = TS_shutdown;
292 }
293 _action_cvar.notify();
294 _thread = nullptr;
295 }
296
297 // Now that we've released the lock, we can join the thread.
298 thread->join();
299 }
300
301 // This is a good time to clean up all of the allocated frame objects. It's
302 // not really necessary to be holding the lock, since the thread is gone,
303 // but we'll grab it anyway just in case someone else starts the thread up
304 // again.
305 MutexHolder holder(_lock);
306
307 _readahead_frames.clear();
308 }
309
310 /**
311 * Returns true if the thread has been started, false if not. This will
312 * always return false if max_readahead_frames is 0.
313 */
314 bool FfmpegVideoCursor::
315 is_thread_started() const {
316 return (_thread_status != TS_stopped);
317 }
318
319 /**
320 * See MovieVideoCursor::set_time().
321 */
322 bool FfmpegVideoCursor::
323 set_time(double timestamp, int loop_count) {
324 int frame = (int)(timestamp / _video_timebase + 0.5);
325
326 if (_eof_known) {
327 if (loop_count == 0) {
328 frame = frame % (_eof_frame + 1);
329 } else {
330 int last_frame = (_eof_frame + 1) * loop_count;
331 if (frame < last_frame) {
332 frame = frame % (_eof_frame + 1);
333 } else {
334 frame = _eof_frame;
335 }
336 }
337 }
338
339 // No point in trying to position before the first frame.
340 frame = std::max(frame, _initial_dts);
341
342 if (ffmpeg_cat.is_spam() && frame != _current_frame) {
343 ffmpeg_cat.spam()
344 << "set_time(" << timestamp << "): " << frame
345 << ", loop_count = " << loop_count << "\n";
346 }
347
348 _current_frame = frame;
349 if (_current_frame_buffer != nullptr) {
350 // If we've previously returned a frame, don't bother asking for a next
351 // one if that frame is still valid.
352 return (_current_frame >= _current_frame_buffer->_end_frame ||
353 _current_frame < _current_frame_buffer->_begin_frame);
354 }
355
356 // If our last request didn't return a frame, try again.
357 return true;
358 }
359
360 /**
361 * See MovieVideoCursor::fetch_buffer.
362 */
363 PT(MovieVideoCursor::Buffer) FfmpegVideoCursor::
364 fetch_buffer() {
365 MutexHolder holder(_lock);
366
367 // If there was an error at any point, just return NULL.
368 if (_format_ctx == nullptr) {
369 return nullptr;
370 }
371
372 PT(FfmpegBuffer) frame;
373 if (_thread_status == TS_stopped) {
374 // Non-threaded case. Just get the next frame directly.
375 advance_to_frame(_current_frame);
376 if (_frame_ready) {
377 frame = do_alloc_frame();
378 export_frame(frame);
379 }
380
381 } else {
382 // Threaded case. Wait for the thread to serve up the required frames.
383 if (!_readahead_frames.empty()) {
384 frame = _readahead_frames.front();
385 _readahead_frames.pop_front();
386 _action_cvar.notify();
387 while (frame->_end_frame < _current_frame && !_readahead_frames.empty()) {
388 // This frame is too old. Discard it.
389 if (ffmpeg_cat.is_debug()) {
390 ffmpeg_cat.debug()
391 << "ffmpeg for " << _filename.get_basename()
392 << " at frame " << _current_frame << ", discarding frame at "
393 << frame->_begin_frame << "\n";
394 }
395 frame = _readahead_frames.front();
396 _readahead_frames.pop_front();
397 }
398 if (frame->_begin_frame > _current_frame) {
399 // This frame is too new. Empty all remaining frames and seek
400 // backwards.
401 if (ffmpeg_cat.is_debug()) {
402 ffmpeg_cat.debug()
403 << "ffmpeg for " << _filename.get_basename()
404 << " at frame " << _current_frame << ", encountered too-new frame at "
405 << frame->_begin_frame << "\n";
406 }
407 do_clear_all_frames();
408 if (_thread_status == TS_wait || _thread_status == TS_seek || _thread_status == TS_readahead) {
409 _thread_status = TS_seek;
410 _seek_frame = _current_frame;
411 _action_cvar.notify();
412 }
413 }
414 }
415 if (frame == nullptr || frame->_end_frame < _current_frame) {
416 // No frame available, or the frame is too old. Seek.
417 if (_thread_status == TS_wait || _thread_status == TS_seek || _thread_status == TS_readahead) {
418 _thread_status = TS_seek;
419 _seek_frame = _current_frame;
420 _action_cvar.notify();
421 }
422 }
423 }
424
425 if (frame != nullptr) {
426 bool too_old = (frame->_end_frame < _current_frame && !ffmpeg_show_seek_frames);
427 bool too_new = frame->_begin_frame > _current_frame;
428 if (too_old || too_new) {
429 // The frame is too old or too new. Just recycle it.
430 frame = nullptr;
431 }
432 }
433
434 if (frame != nullptr) {
435 _current_frame_buffer = frame;
436 if (ffmpeg_cat.is_debug()) {
437 ffmpeg_cat.debug()
438 << "ffmpeg for " << _filename.get_basename()
439 << " at frame " << _current_frame << ", returning frame at "
440 << frame->_begin_frame << "\n";
441 }
442 } else {
443 if (ffmpeg_cat.is_debug()) {
444 ffmpeg_cat.debug()
445 << "ffmpeg for " << _filename.get_basename()
446 << " at frame " << _current_frame << ", returning NULL\n";
447 }
448 }
449 return frame;
450 }
451
452 /**
453 * May be called by a derived class to allocate a new Buffer object.
454 */
455 PT(MovieVideoCursor::Buffer) FfmpegVideoCursor::
456 make_new_buffer() {
457 PT(FfmpegBuffer) frame = new FfmpegBuffer(size_x() * size_y() * get_num_components(), _video_timebase);
458 return frame;
459 }
460
461 /**
462 * Opens the stream for the first time, or when needed internally.
463 */
464 bool FfmpegVideoCursor::
465 open_stream() {
466 nassertr(!_ffvfile.is_open(), false);
467
468 // Hold the global lock while we open the file and create avcodec objects.
469 ReMutexHolder av_holder(_av_lock);
470
471 if (!_source->get_subfile_info().is_empty()) {
472 // Read a subfile.
473 if (!_ffvfile.open_subfile(_source->get_subfile_info())) {
474 ffmpeg_cat.info()
475 << "Couldn't open " << _source->get_subfile_info() << "\n";
476 close_stream();
477 return false;
478 }
479
480 } else {
481 // Read a filename.
482 if (!_ffvfile.open_vfs(_filename)) {
483 ffmpeg_cat.info()
484 << "Couldn't open " << _filename << "\n";
485 close_stream();
486 return false;
487 }
488 }
489
490 nassertr(_format_ctx == nullptr, false);
491 _format_ctx = _ffvfile.get_format_context();
492 nassertr(_format_ctx != nullptr, false);
493
494 if (avformat_find_stream_info(_format_ctx, nullptr) < 0) {
495 ffmpeg_cat.info()
496 << "Couldn't find stream info\n";
497 close_stream();
498 return false;
499 }
500
501 nassertr(_video_ctx == nullptr, false);
502
503 // As of libavformat version 57.41.100, AVStream.codec is deprecated in favor
504 // of AVStream.codecpar. Fortunately, the two structures have
505 // similarly-named members, so we can just switch out the declaration.
506 #if LIBAVFORMAT_VERSION_INT >= AV_VERSION_INT(57, 41, 100)
507 AVCodecParameters *codecpar;
508 #else
509 AVCodecContext *codecpar;
510 #endif
511
512 // Find the video stream
513 AVStream *stream = nullptr;
514 for (int i = 0; i < (int)_format_ctx->nb_streams; ++i) {
515 #if LIBAVFORMAT_VERSION_INT >= AV_VERSION_INT(57, 41, 100)
516 codecpar = _format_ctx->streams[i]->codecpar;
517 #else
518 codecpar = _format_ctx->streams[i]->codec;
519 #endif
520 if (codecpar->codec_type == AVMEDIA_TYPE_VIDEO) {
521 _video_index = i;
522 stream = _format_ctx->streams[i];
523 break;
524 }
525 }
526
527 if (stream == nullptr) {
528 ffmpeg_cat.info()
529 << "Couldn't find stream\n";
530 close_stream();
531 return false;
532 }
533
534 _video_timebase = av_q2d(stream->time_base);
535 _min_fseek = (int)(3.0 / _video_timebase);
536
537 AVCodec *pVideoCodec = nullptr;
538 if (ffmpeg_prefer_libvpx) {
539 #if LIBAVCODEC_VERSION_INT >= AV_VERSION_INT(55, 0, 0)
540 if (codecpar->codec_id == AV_CODEC_ID_VP9) {
541 pVideoCodec = avcodec_find_decoder_by_name("libvpx-vp9");
542 } else
543 #endif
544 if (codecpar->codec_id == AV_CODEC_ID_VP8) {
545 pVideoCodec = avcodec_find_decoder_by_name("libvpx");
546 }
547 }
548 if (pVideoCodec == nullptr) {
549 pVideoCodec = avcodec_find_decoder(codecpar->codec_id);
550 }
551 if (pVideoCodec == nullptr) {
552 ffmpeg_cat.info()
553 << "Couldn't find codec\n";
554 close_stream();
555 return false;
556 }
557
558 _video_ctx = avcodec_alloc_context3(pVideoCodec);
559
560 if (_video_ctx == nullptr) {
561 ffmpeg_cat.info()
562 << "Couldn't allocate _video_ctx\n";
563 close_stream();
564 return false;
565 }
566
567 #if LIBAVFORMAT_VERSION_INT >= AV_VERSION_INT(57, 41, 100)
568 avcodec_parameters_to_context(_video_ctx, codecpar);
569 #else
570 avcodec_copy_context(_video_ctx, codecpar);
571 #endif
572
573 if (avcodec_open2(_video_ctx, pVideoCodec, nullptr) < 0) {
574 ffmpeg_cat.info()
575 << "Couldn't open codec\n";
576 close_stream();
577 return false;
578 }
579
580 _size_x = _video_ctx->width;
581 _size_y = _video_ctx->height;
582 _num_components = 3;
583 _length = (double)_format_ctx->duration / (double)AV_TIME_BASE;
584 _can_seek = true;
585 _can_seek_fast = true;
586
587 return true;
588 }
589
590 /**
591 * Closes the stream, during cleanup or when needed internally.
592 */
593 void FfmpegVideoCursor::
594 close_stream() {
595 // Hold the global lock while we free avcodec objects.
596 ReMutexHolder av_holder(_av_lock);
597
598 if (_video_ctx && _video_ctx->codec) {
599 #if LIBAVCODEC_VERSION_INT >= AV_VERSION_INT(57, 37, 100)
600 // We need to drain the codec to prevent a memory leak.
601 avcodec_send_packet(_video_ctx, nullptr);
602 while (avcodec_receive_frame(_video_ctx, _frame) == 0) {}
603 avcodec_flush_buffers(_video_ctx);
604 #endif
605
606 avcodec_close(_video_ctx);
607 #if LIBAVCODEC_VERSION_INT >= AV_VERSION_INT(55, 52, 0)
608 avcodec_free_context(&_video_ctx);
609 #else
610 av_free(_video_ctx);
611 #endif
612 }
613 _video_ctx = nullptr;
614
615 _ffvfile.close();
616 _format_ctx = nullptr;
617
618 _video_index = -1;
619 }
620
621 /**
622 * Reset to a standard inactive state.
623 */
624 void FfmpegVideoCursor::
625 cleanup() {
626 stop_thread();
627 close_stream();
628
629 ReMutexHolder av_holder(_av_lock);
630
631 #ifdef HAVE_SWSCALE
632 if (_convert_ctx != nullptr) {
633 sws_freeContext(_convert_ctx);
634 }
635 _convert_ctx = nullptr;
636 #endif // HAVE_SWSCALE
637
638 if (_frame) {
639 av_free(_frame);
640 _frame = nullptr;
641 }
642
643 if (_frame_out) {
644 _frame_out->data[0] = nullptr;
645 av_free(_frame_out);
646 _frame_out = nullptr;
647 }
648
649 if (_packet) {
650 #if LIBAVCODEC_VERSION_INT >= AV_VERSION_INT(57, 12, 100)
651 av_packet_free(&_packet);
652 #else
653 if (_packet->data) {
654 av_free_packet(_packet);
655 }
656 delete _packet;
657 _packet = nullptr;
658 #endif
659 }
660 }
661
662 /**
663 * The thread main function, static version (for passing to GenericThread).
664 */
665 void FfmpegVideoCursor::
666 st_thread_main(void *self) {
667 ((FfmpegVideoCursor *)self)->thread_main();
668 }
669
670 /**
671 * The thread main function.
672 */
673 void FfmpegVideoCursor::
674 thread_main() {
675 if (ffmpeg_cat.is_spam()) {
676 ffmpeg_cat.spam()
677 << "ffmpeg thread for " << _filename.get_basename() << " starting.\n";
678 }
679
680 // First, push the first frame onto the readahead queue.
681 if (_frame_ready) {
682 PT(FfmpegBuffer) frame = do_alloc_frame();
683 export_frame(frame);
684 MutexHolder holder(_lock);
685 _readahead_frames.push_back(frame);
686 }
687
688 // Now repeatedly wait for something interesting to do, until we're told to
689 // shut down.
690 MutexHolder holder(_lock);
691 while (_thread_status != TS_shutdown) {
692 nassertv(_thread_status != TS_stopped);
693 _action_cvar.wait();
694
695 while (do_poll()) {
696 // Keep doing stuff as long as there's something to do.
697 _lock.release();
698 PStatClient::thread_tick(_sync_name);
699 Thread::consider_yield();
700 _lock.acquire();
701 }
702 }
703
704 _thread_status = TS_stopped;
705 if (ffmpeg_cat.is_spam()) {
706 ffmpeg_cat.spam()
707 << "ffmpeg thread for " << _filename.get_basename() << " stopped.\n";
708 }
709 }
710
711 /**
712 * Called within the sub-thread. Assumes the lock is already held. If there
713 * is something for the thread to do, does it and returns true. If there is
714 * nothing for the thread to do, returns false.
715 */
716 bool FfmpegVideoCursor::
717 do_poll() {
718 switch (_thread_status) {
719 case TS_stopped:
720 case TS_seeking:
721 // This shouldn't be possible while the thread is running.
722 nassertr(false, false);
723 return false;
724
725 case TS_wait:
726 // The video hasn't started playing yet.
727 return false;
728
729 case TS_readahead:
730 if ((int)_readahead_frames.size() < _max_readahead_frames) {
731 // Time to read the next frame.
732 PT(FfmpegBuffer) frame = do_alloc_frame();
733 nassertr(frame != nullptr, false);
734 _lock.release();
735 fetch_frame(-1);
736 if (_frame_ready) {
737 export_frame(frame);
738 _lock.acquire();
739 _readahead_frames.push_back(frame);
740 } else {
741 // No frame.
742 _lock.acquire();
743 }
744 return true;
745 }
746
747 // No room for the next frame yet. Wait for more.
748 return false;
749
750 case TS_seek:
751 // Seek to a specific frame.
752 {
753 int seek_frame = _seek_frame;
754 _thread_status = TS_seeking;
755 PT(FfmpegBuffer) frame = do_alloc_frame();
756 nassertr(frame != nullptr, false);
757 _lock.release();
758 if (seek_frame != _begin_frame) {
759 advance_to_frame(seek_frame);
760 }
761 if (_frame_ready) {
762 export_frame(frame);
763 _lock.acquire();
764 do_clear_all_frames();
765 _readahead_frames.push_back(frame);
766 } else {
767 _lock.acquire();
768 do_clear_all_frames();
769 }
770
771 if (_thread_status == TS_seeking) {
772 // After seeking, we automatically transition to readahead.
773 _thread_status = TS_readahead;
774 }
775 }
776 return true;
777
778 case TS_shutdown:
779 // Time to stop the thread.
780 return false;
781 }
782
783 return false;
784 }
785
786 /**
787 * Allocates a new Buffer object. Assumes the lock is held.
788 */
789 PT(FfmpegVideoCursor::FfmpegBuffer) FfmpegVideoCursor::
790 do_alloc_frame() {
791 PT(Buffer) buffer = make_new_buffer();
792 return (FfmpegBuffer *)buffer.p();
793 }
794
795 /**
796 * Empties the entire readahead_frames queue. Assumes the lock is held.
797 */
798 void FfmpegVideoCursor::
799 do_clear_all_frames() {
800 _readahead_frames.clear();
801 }
802
803 /**
804 * Called within the sub-thread. Fetches a video packet and stores it in the
805 * packet0 buffer. Sets packet_frame to the packet's timestamp. If a packet
806 * could not be read, the packet is cleared and the packet_frame is set to the
807 * specified default value. Returns true on failure (such as the end of the
808 * video), or false on success.
809 */
810 bool FfmpegVideoCursor::
811 fetch_packet(int default_frame) {
812 if (ffmpeg_global_lock) {
813 ReMutexHolder av_holder(_av_lock);
814 return do_fetch_packet(default_frame);
815 } else {
816 return do_fetch_packet(default_frame);
817 }
818 }
819
820 /**
821 * As above, with the ffmpeg global lock held (if configured on).
822 */
823 bool FfmpegVideoCursor::
824 do_fetch_packet(int default_frame) {
825 if (_packet->data) {
826 #if LIBAVCODEC_VERSION_INT >= AV_VERSION_INT(57, 12, 100)
827 av_packet_unref(_packet);
828 #else
829 av_free_packet(_packet);
830 #endif
831 }
832 while (av_read_frame(_format_ctx, _packet) >= 0) {
833 if (_packet->stream_index == _video_index) {
834 _packet_frame = _packet->dts;
835 return false;
836 }
837 #if LIBAVCODEC_VERSION_INT >= AV_VERSION_INT(57, 12, 100)
838 av_packet_unref(_packet);
839 #else
840 av_free_packet(_packet);
841 #endif
842 }
843 _packet->data = nullptr;
844
845 if (!_eof_known && default_frame != 0) {
846 _eof_frame = _packet_frame;
847 _eof_known = true;
848 }
849
850 if (ffmpeg_cat.is_spam()) {
851 if (_eof_known) {
852 ffmpeg_cat.spam()
853 << "end of video at frame " << _eof_frame << "\n";
854 } else {
855 ffmpeg_cat.spam()
856 << "end of video\n";
857 }
858 }
859 _packet_frame = default_frame;
860 return true;
861 }
862
863 /**
864 * Called within the sub-thread. Slides forward until the indicated frame,
865 * then fetches a frame from the stream and stores it in the frame buffer.
866 * Sets _begin_frame and _end_frame to indicate the extents of the frame.
867 * Sets _frame_ready true to indicate a frame is now available, or false if it
868 * is not (for instance, because the end of the video was reached).
869 */
870 void FfmpegVideoCursor::
871 fetch_frame(int frame) {
872 PStatTimer timer(_fetch_buffer_pcollector);
873
874 int finished = 0;
875
876 if (_packet_frame <= frame) {
877 finished = 0;
878
879 // Get the next packet. The first packet beyond the frame we're looking
880 // for marks the point to stop.
881 while (_packet_frame <= frame) {
882 PStatTimer timer(_seek_pcollector);
883
884 // Decode the previous packet, and get the next one.
885 decode_frame(finished);
886 _begin_frame = _packet_frame;
887 if (fetch_packet(frame)) {
888 _end_frame = _packet_frame;
889 _frame_ready = false;
890 return;
891 }
892 }
893
894 } else {
895 // Just get the next frame.
896 finished = 0;
897 while (!finished && _packet->data) {
898 decode_frame(finished);
899 _begin_frame = _packet_frame;
900 fetch_packet(_begin_frame + 1);
901 }
902 }
903
904 _end_frame = _packet_frame;
905 _frame_ready = true;
906 }
907
908 /**
909 * Called within the sub-thread. Decodes the data in the specified packet
910 * into _frame.
911 */
912 void FfmpegVideoCursor::
913 decode_frame(int &finished) {
914 if (ffmpeg_global_lock) {
915 ReMutexHolder av_holder(_av_lock);
916 do_decode_frame(finished);
917 } else {
918 do_decode_frame(finished);
919 }
920 }
921
922 /**
923 * As above, with the ffmpeg global lock held (if configured on).
924 */
925 void FfmpegVideoCursor::
926 do_decode_frame(int &finished) {
927 #if LIBAVCODEC_VERSION_INT >= AV_VERSION_INT(57, 37, 100)
928 // While the audio cursor has a really nice async loop for decoding, we
929 // don't really do that much with video since we're already delegated to
930 // another thread here. This is just to silence the deprecation warning
931 // on avcodec_decode_video2.
932 avcodec_send_packet(_video_ctx, _packet);
933
934 int ret = avcodec_receive_frame(_video_ctx, _frame);
935 finished = (ret == 0);
936 #else
937 avcodec_decode_video2(_video_ctx, _frame, &finished, _packet);
938 #endif
939 }
940
941 /**
942 * Called within the sub-thread. Seeks to a target location. Afterward, the
943 * packet_frame is guaranteed to be less than or equal to the specified frame.
944 */
945 void FfmpegVideoCursor::
946 seek(int frame, bool backward) {
947 PStatTimer timer(_seek_pcollector);
948
949 if (ffmpeg_support_seek) {
950 if (ffmpeg_global_lock) {
951 ReMutexHolder av_holder(_av_lock);
952 do_seek(frame, backward);
953 } else {
954 do_seek(frame, backward);
955 }
956
957 } else {
958 // If seeking isn't supported, close-and-reopen.
959 if (backward) {
960 reset_stream();
961 }
962 }
963 }
964
965 /**
966 * As above, with the ffmpeg global lock held (if configured on). Also only
967 * if ffmpeg-support-seek is on.
968 */
969 void FfmpegVideoCursor::
970 do_seek(int frame, bool backward) {
971 int64_t target_ts = (int64_t)frame;
972 if (target_ts < (int64_t)(_initial_dts)) {
973 // Attempts to seek before the first packet will fail.
974 target_ts = _initial_dts;
975 }
976 int flags = 0;
977 if (backward) {
978 flags = AVSEEK_FLAG_BACKWARD;
979 }
980
981 if (av_seek_frame(_format_ctx, _video_index, target_ts, flags) < 0) {
982 if (ffmpeg_cat.is_spam()) {
983 ffmpeg_cat.spam()
984 << "Seek failure.\n";
985 }
986
987 if (backward) {
988 // Now try to seek forward.
989 reset_stream();
990 seek(frame, false);
991 return;
992 }
993
994 // Try a binary search to get a little closer.
995 if (binary_seek(_initial_dts, frame, frame, 1) < 0) {
996 if (ffmpeg_cat.is_spam()) {
997 ffmpeg_cat.spam()
998 << "Seek double failure.\n";
999 }
1000 reset_stream();
1001 return;
1002 }
1003 }
1004
1005 fetch_packet(0);
1006 fetch_frame(-1);
1007 }
1008
1009 /**
1010 * Casts about within the stream for a reasonably-close frame to seek to.
1011 * We're trying to get as close as possible to target_frame.
1012 */
1013 int FfmpegVideoCursor::
1014 binary_seek(int min_frame, int max_frame, int target_frame, int num_iterations) {
1015 int try_frame = (min_frame + max_frame) / 2;
1016 if (num_iterations > 5 || try_frame >= max_frame) {
1017 // Success.
1018 return 0;
1019 }
1020
1021 if (av_seek_frame(_format_ctx, _video_index, try_frame, AVSEEK_FLAG_BACKWARD) < 0) {
1022 // Failure. Try lower.
1023 if (binary_seek(min_frame, try_frame - 1, target_frame, num_iterations + 1) < 0) {
1024 return -1;
1025 }
1026 } else {
1027 // Success. Try higher.
1028 if (binary_seek(try_frame + 1, max_frame, target_frame, num_iterations + 1) < 0) {
1029 return -1;
1030 }
1031 }
1032 return 0;
1033 }
1034
1035 /**
1036 * Resets the stream to its initial, first-opened state by closing and re-
1037 * opening it.
1038 */
1039 void FfmpegVideoCursor::
1040 reset_stream() {
1041 if (ffmpeg_cat.is_spam()) {
1042 ffmpeg_cat.spam()
1043 << "Resetting ffmpeg stream.\n";
1044 }
1045
1046 close_stream();
1047 if (!open_stream()) {
1048 ffmpeg_cat.error()
1049 << "Stream error, invalidating movie.\n";
1050 cleanup();
1051 return;
1052 }
1053
1054 fetch_packet(0);
1055 fetch_frame(-1);
1056 }
1057
1058 /**
1059 * Called within the sub-thread. Advance until the specified frame is in the
1060 * export buffer.
1061 */
1062 void FfmpegVideoCursor::
1063 advance_to_frame(int frame) {
1064 PStatTimer timer(_fetch_buffer_pcollector);
1065
1066 if (frame < _begin_frame) {
1067 // Frame is in the past.
1068 if (ffmpeg_cat.is_spam()) {
1069 ffmpeg_cat.spam()
1070 << "Seeking backward to " << frame << " from " << _begin_frame << "\n";
1071 }
1072 seek(frame, true);
1073 if (_begin_frame > frame) {
1074 if (ffmpeg_cat.is_spam()) {
1075 ffmpeg_cat.spam()
1076 << "Ended up at " << _begin_frame << ", not far enough back!\n";
1077 }
1078 reset_stream();
1079 if (ffmpeg_cat.is_spam()) {
1080 ffmpeg_cat.spam()
1081 << "Reseek to 0, got " << _begin_frame << "\n";
1082 }
1083 }
1084 if (frame > _end_frame) {
1085 if (ffmpeg_cat.is_spam()) {
1086 ffmpeg_cat.spam()
1087 << "Now sliding forward to " << frame << " from " << _begin_frame << "\n";
1088 }
1089 fetch_frame(frame);
1090 }
1091
1092 } else if (frame < _end_frame) {
1093 // Frame is in the present: already have the frame.
1094 if (ffmpeg_cat.is_spam()) {
1095 ffmpeg_cat.spam()
1096 << "Currently have " << frame << " within " << _begin_frame << " .. " << _end_frame << "\n";
1097 }
1098
1099 } else if (frame < _end_frame + _min_fseek) {
1100 // Frame is in the near future.
1101 if (ffmpeg_cat.is_spam()) {
1102 ffmpeg_cat.spam()
1103 << "Sliding forward to " << frame << " from " << _begin_frame << "\n";
1104 }
1105 fetch_frame(frame);
1106
1107 } else {
1108 // Frame is in the far future. Seek forward, then read. There's a danger
1109 // here: because keyframes are spaced unpredictably, trying to seek
1110 // forward could actually move us backward in the stream! This must be
1111 // avoided. So the rule is, try the seek. If it hurts us by moving us
1112 // backward, we increase the minimum threshold distance for forward-
1113 // seeking in the future.
1114
1115 if (ffmpeg_cat.is_spam()) {
1116 ffmpeg_cat.spam()
1117 << "Jumping forward to " << frame << " from " << _begin_frame << "\n";
1118 }
1119 int base = _begin_frame;
1120 seek(frame, false);
1121 if (_begin_frame < base) {
1122 _min_fseek += (base - _begin_frame);
1123 if (ffmpeg_cat.is_spam()) {
1124 ffmpeg_cat.spam()
1125 << "Wrong way! Increasing _min_fseek to " << _min_fseek << "\n";
1126 }
1127 }
1128 if (frame > _end_frame) {
1129 if (ffmpeg_cat.is_spam()) {
1130 ffmpeg_cat.spam()
1131 << "Correcting, sliding forward to " << frame << " from " << _begin_frame << "\n";
1132 }
1133 fetch_frame(frame);
1134 }
1135 }
1136
1137 if (ffmpeg_cat.is_spam()) {
1138 ffmpeg_cat.spam()
1139 << "Wanted " << frame << ", got " << _begin_frame << "\n";
1140 }
1141 }
1142
1143 /**
1144 * Called within the sub-thread. Exports the contents of the frame buffer
1145 * into the indicated target buffer.
1146 */
1147 void FfmpegVideoCursor::
1148 export_frame(FfmpegBuffer *buffer) {
1149 PStatTimer timer(_export_frame_pcollector);
1150
1151 if (!_frame_ready) {
1152 // No frame data ready, just fill with black.
1153 if (ffmpeg_cat.is_spam()) {
1154 ffmpeg_cat.spam()
1155 << "ffmpeg for " << _filename.get_basename()
1156 << ", no frame available.\n";
1157 }
1158 memset(buffer->_block, 0, buffer->_block_size);
1159 return;
1160 }
1161
1162 _frame_out->data[0] = buffer->_block + ((_size_y - 1) * _size_x * _num_components);
1163 _frame_out->linesize[0] = _size_x * -_num_components;
1164 buffer->_begin_frame = _begin_frame;
1165 buffer->_end_frame = _end_frame;
1166
1167 if (ffmpeg_global_lock) {
1168 ReMutexHolder av_holder(_av_lock);
1169 #ifdef HAVE_SWSCALE
1170 nassertv(_convert_ctx != nullptr && _frame != nullptr && _frame_out != nullptr);
1171 sws_scale(_convert_ctx, _frame->data, _frame->linesize, 0, _size_y, _frame_out->data, _frame_out->linesize);
1172 #else
1173 img_convert((AVPicture *)_frame_out, (AVPixelFormat)_pixel_format,
1174 (AVPicture *)_frame, _video_ctx->pix_fmt, _size_x, _size_y);
1175 #endif
1176 } else {
1177 #ifdef HAVE_SWSCALE
1178 nassertv(_convert_ctx != nullptr && _frame != nullptr && _frame_out != nullptr);
1179 sws_scale(_convert_ctx, _frame->data, _frame->linesize, 0, _size_y, _frame_out->data, _frame_out->linesize);
1180 #else
1181 img_convert((AVPicture *)_frame_out, (AVPixelFormat)_pixel_format,
1182 (AVPicture *)_frame, _video_ctx->pix_fmt, _size_x, _size_y);
1183 #endif
1184 }
1185 }
1186
1187 /**
1188 * Tells the BamReader how to create objects of type FfmpegVideo.
1189 */
1190 void FfmpegVideoCursor::
1191 register_with_read_factory() {
1192 BamReader::get_factory()->register_factory(get_class_type(), make_from_bam);
1193 }
1194
1195 /**
1196 * Writes the contents of this object to the datagram for shipping out to a
1197 * Bam file.
1198 */
1199 void FfmpegVideoCursor::
1200 write_datagram(BamWriter *manager, Datagram &dg) {
1201 MovieVideoCursor::write_datagram(manager, dg);
1202
1203 // No need to write any additional data here--all of it comes implicitly
1204 // from the underlying MovieVideo, which we process in finalize().
1205 }
1206
1207 /**
1208 * Called by the BamReader to perform any final actions needed for setting up
1209 * the object after all objects have been read and all pointers have been
1210 * completed.
1211 */
1212 void FfmpegVideoCursor::
1213 finalize(BamReader *) {
1214 if (_source != nullptr) {
1215 FfmpegVideo *video;
1216 DCAST_INTO_V(video, _source);
1217 init_from(video);
1218 }
1219 }
1220
1221 /**
1222 * This function is called by the BamReader's factory when a new object of
1223 * type FfmpegVideo is encountered in the Bam file. It should create the
1224 * FfmpegVideo and extract its information from the file.
1225 */
1226 TypedWritable *FfmpegVideoCursor::
1227 make_from_bam(const FactoryParams &params) {
1228 FfmpegVideoCursor *video = new FfmpegVideoCursor;
1229 DatagramIterator scan;
1230 BamReader *manager;
1231
1232 parse_params(params, scan, manager);
1233 video->fillin(scan, manager);
1234
1235 return video;
1236 }
1237
1238 /**
1239 * This internal function is called by make_from_bam to read in all of the
1240 * relevant data from the BamFile for the new FfmpegVideo.
1241 */
1242 void FfmpegVideoCursor::
1243 fillin(DatagramIterator &scan, BamReader *manager) {
1244 MovieVideoCursor::fillin(scan, manager);
1245
1246 // The MovieVideoCursor gets the underlying MovieVideo pointer. We need a
1247 // finalize callback so we can initialize ourselves once that has been read
1248 // completely.
1249 manager->register_finalize(this);
1250 }
1251
1252 /**
1253 * Used to sort different buffers to ensure they correspond to the same source
1254 * frame, particularly important when synchronizing the different pages of a
1255 * multi-page texture.
1256 *
1257 * Returns 0 if the two buffers are of the same frame, <0 if this one comes
1258 * earlier than the other one, and >0 if the other one comes earlier.
1259 */
1260 int FfmpegVideoCursor::FfmpegBuffer::
1261 compare_timestamp(const Buffer *other) const {
1262 const FfmpegBuffer *fother;
1263 DCAST_INTO_R(fother, other, 0);
1264 if (_end_frame * _video_timebase <= fother->_begin_frame * fother->_video_timebase) {
1265 return -1;
1266 } else if (_begin_frame * _video_timebase >= fother->_end_frame * fother->_video_timebase) {
1267 return 1;
1268 }
1269 return 0;
1270 }
1271
1272 /**
1273 * Returns the nearest timestamp value of this particular buffer. Ideally,
1274 * MovieVideoCursor::set_time() for this timestamp would return this buffer
1275 * again. This need be defined only if compare_timestamp() is also defined.
1276 */
1277 double FfmpegVideoCursor::FfmpegBuffer::
1278 get_timestamp() const {
1279 int mid_frame = (_begin_frame + _end_frame - 1) / 2;
1280 return mid_frame * _video_timebase;
1281 }
bamReader.h
PANDA 3D SOFTWARE Copyright (c) Carnegie Mellon University.
parse_params
void parse_params(const FactoryParams &params, DatagramIterator &scan, BamReader *&manager)
Takes in a FactoryParams, passed from a WritableFactory into any TypedWritable's make function,...
Definition: bamReader.I:275
BamReader
This is the fundamental interface for extracting binary objects from a Bam file, as generated by a Ba...
Definition: bamReader.h:110
BamReader::register_finalize
void register_finalize(TypedWritable *whom)
Should be called by an object reading itself from the Bam file to indicate that this particular objec...
Definition: bamReader.cxx:808
BamReader::get_factory
static WritableFactory * get_factory()
Returns the global WritableFactory for generating TypedWritable objects.
Definition: bamReader.I:177
BamWriter
This is the fundamental interface for writing binary objects to a Bam file, to be extracted later by ...
Definition: bamWriter.h:63
Buffer
Definition: buffer.h:24
ConditionVarDirect::notify
void notify()
Informs one of the other threads who are currently blocked on wait() that the relevant condition has ...
Definition: conditionVarDirect.I:85
ConditionVarDirect::wait
void wait()
Waits on the condition.
Definition: conditionVarDirect.I:53
DatagramIterator
A class to retrieve the individual data elements previously stored in a Datagram.
Definition: datagramIterator.h:27
Datagram
An ordered list of data elements, formatted in memory for transmission over a socket or writing to a ...
Definition: datagram.h:38
FactoryParams
An instance of this class is passed to the Factory when requesting it to do its business and construc...
Definition: factoryParams.h:36
Factory::register_factory
void register_factory(TypeHandle handle, CreateFunc *func, void *user_data=nullptr)
Registers a new kind of thing the Factory will be able to create.
Definition: factory.I:73
FfmpegVideoCursor::FfmpegBuffer
Definition: ffmpegVideoCursor.h:65
FfmpegVideoCursor::FfmpegBuffer::compare_timestamp
virtual int compare_timestamp(const Buffer *other) const
Used to sort different buffers to ensure they correspond to the same source frame,...
Definition: ffmpegVideoCursor.cxx:1261
FfmpegVideoCursor::FfmpegBuffer::get_timestamp
virtual double get_timestamp() const
Returns the nearest timestamp value of this particular buffer.
Definition: ffmpegVideoCursor.cxx:1278
FfmpegVideoCursor
Definition: ffmpegVideoCursor.h:40
FfmpegVideoCursor::set_max_readahead_frames
void set_max_readahead_frames(int max_readahead_frames)
Specifies the maximum number of frames that a sub-thread will attempt to read ahead of the current fr...
Definition: ffmpegVideoCursor.cxx:191
FfmpegVideoCursor::get_max_readahead_frames
int get_max_readahead_frames() const
Returns the maximum number of frames that a sub-thread will attempt to read ahead of the current fram...
Definition: ffmpegVideoCursor.cxx:218
FfmpegVideoCursor::set_time
virtual bool set_time(double timestamp, int loop_count)
See MovieVideoCursor::set_time().
Definition: ffmpegVideoCursor.cxx:323
FfmpegVideoCursor::register_with_read_factory
static void register_with_read_factory()
Tells the BamReader how to create objects of type FfmpegVideo.
Definition: ffmpegVideoCursor.cxx:1191
FfmpegVideoCursor::is_thread_started
bool is_thread_started() const
Returns true if the thread has been started, false if not.
Definition: ffmpegVideoCursor.cxx:315
FfmpegVideoCursor::start_thread
void start_thread()
Explicitly starts the ffmpeg decoding thread after it has been stopped by a call to stop_thread().
Definition: ffmpegVideoCursor.cxx:257
FfmpegVideoCursor::stop_thread
void stop_thread()
Explicitly stops the ffmpeg decoding thread.
Definition: ffmpegVideoCursor.cxx:285
FfmpegVideoCursor::get_thread_priority
ThreadPriority get_thread_priority() const
Returns the current thread priority of the thread that decodes the ffmpeg video stream (if max_readah...
Definition: ffmpegVideoCursor.cxx:246
FfmpegVideoCursor::finalize
virtual void finalize(BamReader *manager)
Called by the BamReader to perform any final actions needed for setting up the object after all objec...
Definition: ffmpegVideoCursor.cxx:1213
FfmpegVideoCursor::set_thread_priority
void set_thread_priority(ThreadPriority thread_priority)
Changes the thread priority of the thread that decodes the ffmpeg video stream (if max_readahead_fram...
Definition: ffmpegVideoCursor.cxx:230
FfmpegVideoCursor::write_datagram
virtual void write_datagram(BamWriter *manager, Datagram &dg)
Writes the contents of this object to the datagram for shipping out to a Bam file.
Definition: ffmpegVideoCursor.cxx:1200
FfmpegVideo
Definition: ffmpegVideo.h:29
FfmpegVirtualFile::open_vfs
bool open_vfs(const Filename &filename)
Opens the movie file via Panda's VFS.
Definition: ffmpegVirtualFile.cxx:59
FfmpegVirtualFile::open_subfile
bool open_subfile(const SubfileInfo &info)
Opens the movie file directly from a file on disk (does not go through the VFS).
Definition: ffmpegVirtualFile.cxx:112
FfmpegVirtualFile::is_open
bool is_open() const
Returns true if the stream is successfully opened, false otherwise.
Definition: ffmpegVirtualFile.I:18
FfmpegVirtualFile::get_format_context
AVFormatContext * get_format_context() const
Returns a pointer to the opened ffmpeg context, or NULL if the file was not successfully opened.
Definition: ffmpegVirtualFile.I:27
FfmpegVirtualFile::close
void close()
Explicitly closes the opened file.
Definition: ffmpegVirtualFile.cxx:159
Filename::get_basename
std::string get_basename() const
Returns the basename part of the filename.
Definition: filename.I:367
GenericThread
A generic thread type that allows calling a C-style thread function without having to subclass.
Definition: genericThread.h:24
MovieVideoCursor::Buffer
Definition: movieVideoCursor.h:62
MovieVideoCursor::write_datagram
virtual void write_datagram(BamWriter *manager, Datagram &dg)
Writes the contents of this object to the datagram for shipping out to a Bam file.
Definition: movieVideoCursor.cxx:329
MutexDirect::release
void release() const
Releases the mutex.
Definition: mutexDirect.I:78
MutexDirect::acquire
void acquire() const
Grabs the mutex if it is available.
Definition: mutexDirect.I:55
MutexHolder
A lightweight C++ object whose constructor calls acquire() and whose destructor calls release() on a ...
Definition: mutexHolder.h:25
PStatCollector
A lightweight class that represents a single element that may be timed and/or counted via stats.
Definition: pStatCollector.h:43
PStatTimer
A lightweight class that can be used to automatically start and stop a PStatCollector around a sectio...
Definition: pStatTimer.h:30
ReMutexHolder
Similar to MutexHolder, but for a reentrant mutex.
Definition: reMutexHolder.h:25
ReMutex
A reentrant mutex.
Definition: reMutex.h:34
Thread::consider_yield
static void consider_yield()
Possibly suspends the current thread for the rest of the current epoch, if it has run for enough this...
Definition: thread.I:212
TypeHandle
TypeHandle is the identifier used to differentiate C++ class types.
Definition: typeHandle.h:81
TypedWritable
Base class for objects that can be written to and read from Bam files.
Definition: typedWritable.h:35
config_ffmpeg.h
PANDA 3D SOFTWARE Copyright (c) Carnegie Mellon University.
PT
PT(MovieVideoCursor::Buffer) FfmpegVideoCursor
See MovieVideoCursor::fetch_buffer.
Definition: ffmpegVideoCursor.cxx:363
ffmpegVideoCursor.h
PANDA 3D SOFTWARE Copyright (c) Carnegie Mellon University.
ffmpegVideo.h
PANDA 3D SOFTWARE Copyright (c) Carnegie Mellon University.
mutexHolder.h
PANDA 3D SOFTWARE Copyright (c) Carnegie Mellon University.
pStatCollector.h
PANDA 3D SOFTWARE Copyright (c) Carnegie Mellon University.
pStatTimer.h
PANDA 3D SOFTWARE Copyright (c) Carnegie Mellon University.
reMutexHolder.h
PANDA 3D SOFTWARE Copyright (c) Carnegie Mellon University.