1 #include "video_stream.h"
4 #include <libavformat/avformat.h>
5 #include <libavformat/avio.h>
8 #include "chroma_subsampler.h"
9 #include "shared/context.h"
12 #include "shared/httpd.h"
13 #include "jpeg_frame_view.h"
14 #include "movit/util.h"
15 #include "shared/mux.h"
18 #include "ycbcr_converter.h"
20 #include <epoxy/glx.h>
25 using namespace std::chrono;
27 extern HTTPD *global_httpd;
29 struct VectorDestinationManager {
30 jpeg_destination_mgr pub;
31 std::vector<uint8_t> dest;
33 VectorDestinationManager()
35 pub.init_destination = init_destination_thunk;
36 pub.empty_output_buffer = empty_output_buffer_thunk;
37 pub.term_destination = term_destination_thunk;
40 static void init_destination_thunk(j_compress_ptr ptr)
42 ((VectorDestinationManager *)(ptr->dest))->init_destination();
45 inline void init_destination()
50 static boolean empty_output_buffer_thunk(j_compress_ptr ptr)
52 return ((VectorDestinationManager *)(ptr->dest))->empty_output_buffer();
55 inline bool empty_output_buffer()
57 make_room(dest.size()); // Should ignore pub.free_in_buffer!
61 inline void make_room(size_t bytes_used)
63 dest.resize(bytes_used + 4096);
64 dest.resize(dest.capacity());
65 pub.next_output_byte = dest.data() + bytes_used;
66 pub.free_in_buffer = dest.size() - bytes_used;
69 static void term_destination_thunk(j_compress_ptr ptr)
71 ((VectorDestinationManager *)(ptr->dest))->term_destination();
74 inline void term_destination()
76 dest.resize(dest.size() - pub.free_in_buffer);
79 static_assert(std::is_standard_layout<VectorDestinationManager>::value, "");
81 vector<uint8_t> encode_jpeg(const uint8_t *y_data, const uint8_t *cb_data, const uint8_t *cr_data, unsigned width, unsigned height)
83 VectorDestinationManager dest;
85 jpeg_compress_struct cinfo;
87 cinfo.err = jpeg_std_error(&jerr);
88 jpeg_create_compress(&cinfo);
90 cinfo.dest = (jpeg_destination_mgr *)&dest;
91 cinfo.input_components = 3;
92 cinfo.in_color_space = JCS_RGB;
93 jpeg_set_defaults(&cinfo);
94 constexpr int quality = 90;
95 jpeg_set_quality(&cinfo, quality, /*force_baseline=*/false);
97 cinfo.image_width = width;
98 cinfo.image_height = height;
99 cinfo.raw_data_in = true;
100 jpeg_set_colorspace(&cinfo, JCS_YCbCr);
101 cinfo.comp_info[0].h_samp_factor = 2;
102 cinfo.comp_info[0].v_samp_factor = 1;
103 cinfo.comp_info[1].h_samp_factor = 1;
104 cinfo.comp_info[1].v_samp_factor = 1;
105 cinfo.comp_info[2].h_samp_factor = 1;
106 cinfo.comp_info[2].v_samp_factor = 1;
107 cinfo.CCIR601_sampling = true; // Seems to be mostly ignored by libjpeg, though.
108 jpeg_start_compress(&cinfo, true);
110 // This comment marker is private to FFmpeg. It signals limited Y'CbCr range
111 // (and nothing else).
112 jpeg_write_marker(&cinfo, JPEG_COM, (const JOCTET *)"CS=ITU601", strlen("CS=ITU601"));
114 JSAMPROW yptr[8], cbptr[8], crptr[8];
115 JSAMPARRAY data[3] = { yptr, cbptr, crptr };
116 for (unsigned y = 0; y < height; y += 8) {
117 for (unsigned yy = 0; yy < 8; ++yy) {
118 yptr[yy] = const_cast<JSAMPROW>(&y_data[(y + yy) * width]);
119 cbptr[yy] = const_cast<JSAMPROW>(&cb_data[(y + yy) * width / 2]);
120 crptr[yy] = const_cast<JSAMPROW>(&cr_data[(y + yy) * width / 2]);
123 jpeg_write_raw_data(&cinfo, data, /*num_lines=*/8);
126 jpeg_finish_compress(&cinfo);
127 jpeg_destroy_compress(&cinfo);
129 return move(dest.dest);
132 VideoStream::VideoStream(AVFormatContext *file_avctx)
133 : avctx(file_avctx), output_fast_forward(file_avctx != nullptr)
135 ycbcr_converter.reset(new YCbCrConverter(YCbCrConverter::OUTPUT_TO_DUAL_YCBCR, /*resource_pool=*/nullptr));
136 ycbcr_semiplanar_converter.reset(new YCbCrConverter(YCbCrConverter::OUTPUT_TO_SEMIPLANAR, /*resource_pool=*/nullptr));
138 GLuint input_tex[num_interpolate_slots], gray_tex[num_interpolate_slots];
139 GLuint fade_y_output_tex[num_interpolate_slots], fade_cbcr_output_tex[num_interpolate_slots];
140 GLuint cb_tex[num_interpolate_slots], cr_tex[num_interpolate_slots];
142 glCreateTextures(GL_TEXTURE_2D_ARRAY, num_interpolate_slots, input_tex);
143 glCreateTextures(GL_TEXTURE_2D_ARRAY, num_interpolate_slots, gray_tex);
144 glCreateTextures(GL_TEXTURE_2D, num_interpolate_slots, fade_y_output_tex);
145 glCreateTextures(GL_TEXTURE_2D, num_interpolate_slots, fade_cbcr_output_tex);
146 glCreateTextures(GL_TEXTURE_2D, num_interpolate_slots, cb_tex);
147 glCreateTextures(GL_TEXTURE_2D, num_interpolate_slots, cr_tex);
150 size_t width = global_flags.width, height = global_flags.height;
151 int levels = find_num_levels(width, height);
152 for (size_t i = 0; i < num_interpolate_slots; ++i) {
153 glTextureStorage3D(input_tex[i], levels, GL_RGBA8, width, height, 2);
155 glTextureStorage3D(gray_tex[i], levels, GL_R8, width, height, 2);
157 glTextureStorage2D(fade_y_output_tex[i], 1, GL_R8, width, height);
159 glTextureStorage2D(fade_cbcr_output_tex[i], 1, GL_RG8, width, height);
161 glTextureStorage2D(cb_tex[i], 1, GL_R8, width / 2, height);
163 glTextureStorage2D(cr_tex[i], 1, GL_R8, width / 2, height);
166 unique_ptr<InterpolatedFrameResources> resource(new InterpolatedFrameResources);
167 resource->owner = this;
168 resource->input_tex = input_tex[i];
169 resource->gray_tex = gray_tex[i];
170 resource->fade_y_output_tex = fade_y_output_tex[i];
171 resource->fade_cbcr_output_tex = fade_cbcr_output_tex[i];
172 resource->cb_tex = cb_tex[i];
173 resource->cr_tex = cr_tex[i];
174 glCreateFramebuffers(2, resource->input_fbos);
176 glCreateFramebuffers(1, &resource->fade_fbo);
179 glNamedFramebufferTextureLayer(resource->input_fbos[0], GL_COLOR_ATTACHMENT0, input_tex[i], 0, 0);
181 glNamedFramebufferTextureLayer(resource->input_fbos[0], GL_COLOR_ATTACHMENT1, gray_tex[i], 0, 0);
183 glNamedFramebufferTextureLayer(resource->input_fbos[1], GL_COLOR_ATTACHMENT0, input_tex[i], 0, 1);
185 glNamedFramebufferTextureLayer(resource->input_fbos[1], GL_COLOR_ATTACHMENT1, gray_tex[i], 0, 1);
187 glNamedFramebufferTexture(resource->fade_fbo, GL_COLOR_ATTACHMENT0, fade_y_output_tex[i], 0);
189 glNamedFramebufferTexture(resource->fade_fbo, GL_COLOR_ATTACHMENT1, fade_cbcr_output_tex[i], 0);
192 GLuint bufs[] = { GL_COLOR_ATTACHMENT0, GL_COLOR_ATTACHMENT1 };
193 glNamedFramebufferDrawBuffers(resource->input_fbos[0], 2, bufs);
195 glNamedFramebufferDrawBuffers(resource->input_fbos[1], 2, bufs);
197 glNamedFramebufferDrawBuffers(resource->fade_fbo, 2, bufs);
200 glCreateBuffers(1, &resource->pbo);
202 glNamedBufferStorage(resource->pbo, width * height * 4, nullptr, GL_MAP_READ_BIT | GL_MAP_PERSISTENT_BIT);
204 resource->pbo_contents = glMapNamedBufferRange(resource->pbo, 0, width * height * 4, GL_MAP_READ_BIT | GL_MAP_PERSISTENT_BIT);
205 interpolate_resources.push_back(move(resource));
211 if (global_flags.interpolation_quality == 0 ||
212 global_flags.interpolation_quality == 1) {
213 op = operating_point1;
214 } else if (global_flags.interpolation_quality == 2) {
215 op = operating_point2;
216 } else if (global_flags.interpolation_quality == 3) {
217 op = operating_point3;
218 } else if (global_flags.interpolation_quality == 4) {
219 op = operating_point4;
221 // Quality 0 will be changed to 1 in flags.cpp.
225 compute_flow.reset(new DISComputeFlow(width, height, op));
226 interpolate.reset(new Interpolate(op, /*split_ycbcr_output=*/true));
227 interpolate_no_split.reset(new Interpolate(op, /*split_ycbcr_output=*/false));
228 chroma_subsampler.reset(new ChromaSubsampler);
231 // The “last frame” is initially black.
232 unique_ptr<uint8_t[]> y(new uint8_t[global_flags.width * global_flags.height]);
233 unique_ptr<uint8_t[]> cb_or_cr(new uint8_t[(global_flags.width / 2) * global_flags.height]);
234 memset(y.get(), 16, global_flags.width * global_flags.height);
235 memset(cb_or_cr.get(), 128, (global_flags.width / 2) * global_flags.height);
236 last_frame = encode_jpeg(y.get(), cb_or_cr.get(), cb_or_cr.get(), global_flags.width, global_flags.height);
239 VideoStream::~VideoStream() {}
241 void VideoStream::start()
243 if (avctx == nullptr) {
244 avctx = avformat_alloc_context();
246 // We use Matroska, because it's pretty much the only mux where FFmpeg
247 // allows writing chroma location to override JFIF's default center placement.
248 // (Note that at the time of writing, however, FFmpeg does not correctly
249 // _read_ this information!)
250 avctx->oformat = av_guess_format("matroska", nullptr, nullptr);
252 uint8_t *buf = (uint8_t *)av_malloc(MUX_BUFFER_SIZE);
253 avctx->pb = avio_alloc_context(buf, MUX_BUFFER_SIZE, 1, this, nullptr, nullptr, nullptr);
254 avctx->pb->write_data_type = &VideoStream::write_packet2_thunk;
255 avctx->pb->ignore_boundary_point = 1;
257 avctx->flags = AVFMT_FLAG_CUSTOM_IO;
260 size_t width = global_flags.width, height = global_flags.height; // Doesn't matter for MJPEG.
261 mux.reset(new Mux(avctx, width, height, Mux::CODEC_MJPEG, /*video_extradata=*/"", /*audio_codec_parameters=*/nullptr,
262 AVCOL_SPC_BT709, Mux::WITHOUT_AUDIO,
263 COARSE_TIMEBASE, /*write_callback=*/nullptr, Mux::WRITE_FOREGROUND, {}));
265 encode_thread = thread(&VideoStream::encode_thread_func, this);
268 void VideoStream::stop()
271 queue_changed.notify_all();
273 encode_thread.join();
276 void VideoStream::clear_queue()
278 deque<QueuedFrame> q;
281 unique_lock<mutex> lock(queue_lock);
282 q = move(frame_queue);
285 // These are not RAII-ed, unfortunately, so we'll need to clean them ourselves.
286 // Note that release_texture() is thread-safe.
287 for (const QueuedFrame &qf : q) {
288 if (qf.type == QueuedFrame::INTERPOLATED ||
289 qf.type == QueuedFrame::FADED_INTERPOLATED) {
290 compute_flow->release_texture(qf.flow_tex);
292 if (qf.type == QueuedFrame::INTERPOLATED) {
293 interpolate->release_texture(qf.output_tex);
294 interpolate->release_texture(qf.cbcr_tex);
298 // Destroy q outside the mutex, as that would be a double-lock.
301 void VideoStream::schedule_original_frame(steady_clock::time_point local_pts,
302 int64_t output_pts, function<void()> &&display_func,
303 QueueSpotHolder &&queue_spot_holder,
306 fprintf(stderr, "output_pts=%ld original input_pts=%ld\n", output_pts, frame.pts);
308 // Preload the file from disk, so that the encoder thread does not get stalled.
309 // TODO: Consider sending it through the queue instead.
310 (void)frame_reader.read_frame(frame);
313 qf.local_pts = local_pts;
314 qf.type = QueuedFrame::ORIGINAL;
315 qf.output_pts = output_pts;
317 qf.display_func = move(display_func);
318 qf.queue_spot_holder = move(queue_spot_holder);
320 unique_lock<mutex> lock(queue_lock);
321 frame_queue.push_back(move(qf));
322 queue_changed.notify_all();
325 void VideoStream::schedule_faded_frame(steady_clock::time_point local_pts, int64_t output_pts,
326 function<void()> &&display_func,
327 QueueSpotHolder &&queue_spot_holder,
328 FrameOnDisk frame1_spec, FrameOnDisk frame2_spec,
331 fprintf(stderr, "output_pts=%ld faded input_pts=%ld,%ld fade_alpha=%.2f\n", output_pts, frame1_spec.pts, frame2_spec.pts, fade_alpha);
333 // Get the temporary OpenGL resources we need for doing the fade.
334 // (We share these with interpolated frames, which is slightly
335 // overkill, but there's no need to waste resources on keeping
336 // separate pools around.)
337 BorrowedInterpolatedFrameResources resources;
339 unique_lock<mutex> lock(queue_lock);
340 if (interpolate_resources.empty()) {
341 fprintf(stderr, "WARNING: Too many interpolated frames already in transit; dropping one.\n");
344 resources = BorrowedInterpolatedFrameResources(interpolate_resources.front().release());
345 interpolate_resources.pop_front();
350 shared_ptr<Frame> frame1 = decode_jpeg_with_cache(frame1_spec, DECODE_IF_NOT_IN_CACHE, &frame_reader, &did_decode);
351 shared_ptr<Frame> frame2 = decode_jpeg_with_cache(frame2_spec, DECODE_IF_NOT_IN_CACHE, &frame_reader, &did_decode);
353 ycbcr_semiplanar_converter->prepare_chain_for_fade(frame1, frame2, fade_alpha)->render_to_fbo(resources->fade_fbo, global_flags.width, global_flags.height);
356 qf.local_pts = local_pts;
357 qf.type = QueuedFrame::FADED;
358 qf.output_pts = output_pts;
359 qf.frame1 = frame1_spec;
360 qf.display_func = move(display_func);
361 qf.queue_spot_holder = move(queue_spot_holder);
363 qf.secondary_frame = frame2_spec;
365 // Subsample and split Cb/Cr.
366 chroma_subsampler->subsample_chroma(resources->fade_cbcr_output_tex, global_flags.width, global_flags.height, resources->cb_tex, resources->cr_tex);
368 // Read it down (asynchronously) to the CPU.
369 glPixelStorei(GL_PACK_ROW_LENGTH, 0);
370 glBindBuffer(GL_PIXEL_PACK_BUFFER, resources->pbo);
372 glGetTextureImage(resources->fade_y_output_tex, 0, GL_RED, GL_UNSIGNED_BYTE, global_flags.width * global_flags.height * 4, BUFFER_OFFSET(0));
374 glGetTextureImage(resources->cb_tex, 0, GL_RED, GL_UNSIGNED_BYTE, global_flags.width * global_flags.height * 3, BUFFER_OFFSET(global_flags.width * global_flags.height));
376 glGetTextureImage(resources->cr_tex, 0, GL_RED, GL_UNSIGNED_BYTE, global_flags.width * global_flags.height * 3 - (global_flags.width / 2) * global_flags.height, BUFFER_OFFSET(global_flags.width * global_flags.height + (global_flags.width / 2) * global_flags.height));
378 glBindBuffer(GL_PIXEL_PACK_BUFFER, 0);
380 // Set a fence we can wait for to make sure the CPU sees the read.
381 glMemoryBarrier(GL_CLIENT_MAPPED_BUFFER_BARRIER_BIT);
383 qf.fence = RefCountedGLsync(GL_SYNC_GPU_COMMANDS_COMPLETE, /*flags=*/0);
385 qf.resources = move(resources);
386 qf.local_pts = local_pts;
388 unique_lock<mutex> lock(queue_lock);
389 frame_queue.push_back(move(qf));
390 queue_changed.notify_all();
393 void VideoStream::schedule_interpolated_frame(steady_clock::time_point local_pts,
394 int64_t output_pts, function<void(shared_ptr<Frame>)> &&display_func,
395 QueueSpotHolder &&queue_spot_holder,
396 FrameOnDisk frame1, FrameOnDisk frame2,
397 float alpha, FrameOnDisk secondary_frame, float fade_alpha)
399 if (secondary_frame.pts != -1) {
400 fprintf(stderr, "output_pts=%ld interpolated input_pts1=%ld input_pts2=%ld alpha=%.3f secondary_pts=%ld fade_alpha=%.2f\n", output_pts, frame1.pts, frame2.pts, alpha, secondary_frame.pts, fade_alpha);
402 fprintf(stderr, "output_pts=%ld interpolated input_pts1=%ld input_pts2=%ld alpha=%.3f\n", output_pts, frame1.pts, frame2.pts, alpha);
405 // Get the temporary OpenGL resources we need for doing the interpolation.
406 BorrowedInterpolatedFrameResources resources;
408 unique_lock<mutex> lock(queue_lock);
409 if (interpolate_resources.empty()) {
410 fprintf(stderr, "WARNING: Too many interpolated frames already in transit; dropping one.\n");
413 resources = BorrowedInterpolatedFrameResources(interpolate_resources.front().release());
414 interpolate_resources.pop_front();
418 qf.type = (secondary_frame.pts == -1) ? QueuedFrame::INTERPOLATED : QueuedFrame::FADED_INTERPOLATED;
419 qf.output_pts = output_pts;
420 qf.display_decoded_func = move(display_func);
421 qf.queue_spot_holder = move(queue_spot_holder);
422 qf.local_pts = local_pts;
426 // Convert frame0 and frame1 to OpenGL textures.
427 for (size_t frame_no = 0; frame_no < 2; ++frame_no) {
428 FrameOnDisk frame_spec = frame_no == 1 ? frame2 : frame1;
430 shared_ptr<Frame> frame = decode_jpeg_with_cache(frame_spec, DECODE_IF_NOT_IN_CACHE, &frame_reader, &did_decode);
431 ycbcr_converter->prepare_chain_for_conversion(frame)->render_to_fbo(resources->input_fbos[frame_no], global_flags.width, global_flags.height);
434 glGenerateTextureMipmap(resources->input_tex);
436 glGenerateTextureMipmap(resources->gray_tex);
439 // Compute the interpolated frame.
440 qf.flow_tex = compute_flow->exec(resources->gray_tex, DISComputeFlow::FORWARD_AND_BACKWARD, DISComputeFlow::DO_NOT_RESIZE_FLOW);
443 if (secondary_frame.pts != -1) {
444 // Fade. First kick off the interpolation.
445 tie(qf.output_tex, ignore) = interpolate_no_split->exec(resources->input_tex, resources->gray_tex, qf.flow_tex, global_flags.width, global_flags.height, alpha);
448 // Now decode the image we are fading against.
450 shared_ptr<Frame> frame2 = decode_jpeg_with_cache(secondary_frame, DECODE_IF_NOT_IN_CACHE, &frame_reader, &did_decode);
452 // Then fade against it, putting it into the fade Y' and CbCr textures.
453 ycbcr_semiplanar_converter->prepare_chain_for_fade_from_texture(qf.output_tex, global_flags.width, global_flags.height, frame2, fade_alpha)->render_to_fbo(resources->fade_fbo, global_flags.width, global_flags.height);
455 // Subsample and split Cb/Cr.
456 chroma_subsampler->subsample_chroma(resources->fade_cbcr_output_tex, global_flags.width, global_flags.height, resources->cb_tex, resources->cr_tex);
458 interpolate_no_split->release_texture(qf.output_tex);
460 tie(qf.output_tex, qf.cbcr_tex) = interpolate->exec(resources->input_tex, resources->gray_tex, qf.flow_tex, global_flags.width, global_flags.height, alpha);
463 // Subsample and split Cb/Cr.
464 chroma_subsampler->subsample_chroma(qf.cbcr_tex, global_flags.width, global_flags.height, resources->cb_tex, resources->cr_tex);
467 // We could have released qf.flow_tex here, but to make sure we don't cause a stall
468 // when trying to reuse it for the next frame, we can just as well hold on to it
469 // and release it only when the readback is done.
471 // Read it down (asynchronously) to the CPU.
472 glPixelStorei(GL_PACK_ROW_LENGTH, 0);
473 glBindBuffer(GL_PIXEL_PACK_BUFFER, resources->pbo);
475 if (secondary_frame.pts != -1) {
476 glGetTextureImage(resources->fade_y_output_tex, 0, GL_RED, GL_UNSIGNED_BYTE, global_flags.width * global_flags.height * 4, BUFFER_OFFSET(0));
478 glGetTextureImage(qf.output_tex, 0, GL_RED, GL_UNSIGNED_BYTE, global_flags.width * global_flags.height * 4, BUFFER_OFFSET(0));
481 glGetTextureImage(resources->cb_tex, 0, GL_RED, GL_UNSIGNED_BYTE, global_flags.width * global_flags.height * 3, BUFFER_OFFSET(global_flags.width * global_flags.height));
483 glGetTextureImage(resources->cr_tex, 0, GL_RED, GL_UNSIGNED_BYTE, global_flags.width * global_flags.height * 3 - (global_flags.width / 2) * global_flags.height, BUFFER_OFFSET(global_flags.width * global_flags.height + (global_flags.width / 2) * global_flags.height));
485 glBindBuffer(GL_PIXEL_PACK_BUFFER, 0);
487 // Set a fence we can wait for to make sure the CPU sees the read.
488 glMemoryBarrier(GL_CLIENT_MAPPED_BUFFER_BARRIER_BIT);
490 qf.fence = RefCountedGLsync(GL_SYNC_GPU_COMMANDS_COMPLETE, /*flags=*/0);
492 qf.resources = move(resources);
494 unique_lock<mutex> lock(queue_lock);
495 frame_queue.push_back(move(qf));
496 queue_changed.notify_all();
499 void VideoStream::schedule_refresh_frame(steady_clock::time_point local_pts,
500 int64_t output_pts, function<void()> &&display_func,
501 QueueSpotHolder &&queue_spot_holder)
504 qf.type = QueuedFrame::REFRESH;
505 qf.output_pts = output_pts;
506 qf.display_func = move(display_func);
507 qf.queue_spot_holder = move(queue_spot_holder);
509 unique_lock<mutex> lock(queue_lock);
510 frame_queue.push_back(move(qf));
511 queue_changed.notify_all();
516 shared_ptr<Frame> frame_from_pbo(void *contents, size_t width, size_t height)
518 size_t chroma_width = width / 2;
520 const uint8_t *y = (const uint8_t *)contents;
521 const uint8_t *cb = (const uint8_t *)contents + width * height;
522 const uint8_t *cr = (const uint8_t *)contents + width * height + chroma_width * height;
524 shared_ptr<Frame> frame(new Frame);
525 frame->y.reset(new uint8_t[width * height]);
526 frame->cb.reset(new uint8_t[chroma_width * height]);
527 frame->cr.reset(new uint8_t[chroma_width * height]);
528 for (unsigned yy = 0; yy < height; ++yy) {
529 memcpy(frame->y.get() + width * yy, y + width * yy, width);
530 memcpy(frame->cb.get() + chroma_width * yy, cb + chroma_width * yy, chroma_width);
531 memcpy(frame->cr.get() + chroma_width * yy, cr + chroma_width * yy, chroma_width);
533 frame->is_semiplanar = false;
534 frame->width = width;
535 frame->height = height;
536 frame->chroma_subsampling_x = 2;
537 frame->chroma_subsampling_y = 1;
538 frame->pitch_y = width;
539 frame->pitch_chroma = chroma_width;
545 void VideoStream::encode_thread_func()
547 pthread_setname_np(pthread_self(), "VideoStream");
548 QSurface *surface = create_surface();
549 QOpenGLContext *context = create_context(surface);
550 bool ok = make_current(context, surface);
552 fprintf(stderr, "Video stream couldn't get an OpenGL context\n");
556 while (!should_quit) {
559 unique_lock<mutex> lock(queue_lock);
561 // Wait until we have a frame to play.
562 queue_changed.wait(lock, [this]{
563 return !frame_queue.empty() || should_quit;
568 steady_clock::time_point frame_start = frame_queue.front().local_pts;
570 // Now sleep until the frame is supposed to start (the usual case),
571 // _or_ clear_queue() happened.
573 if (output_fast_forward) {
574 aborted = frame_queue.empty() || frame_queue.front().local_pts != frame_start;
576 aborted = queue_changed.wait_until(lock, frame_start, [this, frame_start]{
577 return frame_queue.empty() || frame_queue.front().local_pts != frame_start;
581 // clear_queue() happened, so don't play this frame after all.
584 qf = move(frame_queue.front());
585 frame_queue.pop_front();
588 if (qf.type == QueuedFrame::ORIGINAL) {
589 // Send the JPEG frame on, unchanged.
590 string jpeg = frame_reader.read_frame(qf.frame1);
592 av_init_packet(&pkt);
593 pkt.stream_index = 0;
594 pkt.data = (uint8_t *)jpeg.data();
595 pkt.size = jpeg.size();
596 mux->add_packet(pkt, qf.output_pts, qf.output_pts);
598 last_frame.assign(&jpeg[0], &jpeg[0] + jpeg.size());
599 } else if (qf.type == QueuedFrame::FADED) {
600 glClientWaitSync(qf.fence.get(), /*flags=*/0, GL_TIMEOUT_IGNORED);
602 shared_ptr<Frame> frame = frame_from_pbo(qf.resources->pbo_contents, global_flags.width, global_flags.height);
604 // Now JPEG encode it, and send it on to the stream.
605 vector<uint8_t> jpeg = encode_jpeg(frame->y.get(), frame->cb.get(), frame->cr.get(), global_flags.width, global_flags.height);
608 av_init_packet(&pkt);
609 pkt.stream_index = 0;
610 pkt.data = (uint8_t *)jpeg.data();
611 pkt.size = jpeg.size();
612 mux->add_packet(pkt, qf.output_pts, qf.output_pts);
613 last_frame = move(jpeg);
614 } else if (qf.type == QueuedFrame::INTERPOLATED || qf.type == QueuedFrame::FADED_INTERPOLATED) {
615 glClientWaitSync(qf.fence.get(), /*flags=*/0, GL_TIMEOUT_IGNORED);
617 // Send it on to display.
618 shared_ptr<Frame> frame = frame_from_pbo(qf.resources->pbo_contents, global_flags.width, global_flags.height);
619 if (qf.display_decoded_func != nullptr) {
620 qf.display_decoded_func(frame);
623 // Now JPEG encode it, and send it on to the stream.
624 vector<uint8_t> jpeg = encode_jpeg(frame->y.get(), frame->cb.get(), frame->cr.get(), global_flags.width, global_flags.height);
625 compute_flow->release_texture(qf.flow_tex);
626 if (qf.type != QueuedFrame::FADED_INTERPOLATED) {
627 interpolate->release_texture(qf.output_tex);
628 interpolate->release_texture(qf.cbcr_tex);
632 av_init_packet(&pkt);
633 pkt.stream_index = 0;
634 pkt.data = (uint8_t *)jpeg.data();
635 pkt.size = jpeg.size();
636 mux->add_packet(pkt, qf.output_pts, qf.output_pts);
637 last_frame = move(jpeg);
638 } else if (qf.type == QueuedFrame::REFRESH) {
640 av_init_packet(&pkt);
641 pkt.stream_index = 0;
642 pkt.data = (uint8_t *)last_frame.data();
643 pkt.size = last_frame.size();
644 mux->add_packet(pkt, qf.output_pts, qf.output_pts);
648 if (qf.display_func != nullptr) {
654 int VideoStream::write_packet2_thunk(void *opaque, uint8_t *buf, int buf_size, AVIODataMarkerType type, int64_t time)
656 VideoStream *video_stream = (VideoStream *)opaque;
657 return video_stream->write_packet2(buf, buf_size, type, time);
660 int VideoStream::write_packet2(uint8_t *buf, int buf_size, AVIODataMarkerType type, int64_t time)
662 if (type == AVIO_DATA_MARKER_SYNC_POINT || type == AVIO_DATA_MARKER_BOUNDARY_POINT) {
663 seen_sync_markers = true;
664 } else if (type == AVIO_DATA_MARKER_UNKNOWN && !seen_sync_markers) {
665 // We don't know if this is a keyframe or not (the muxer could
666 // avoid marking it), so we just have to make the best of it.
667 type = AVIO_DATA_MARKER_SYNC_POINT;
670 if (type == AVIO_DATA_MARKER_HEADER) {
671 stream_mux_header.append((char *)buf, buf_size);
672 global_httpd->set_header(HTTPD::MAIN_STREAM, stream_mux_header);
674 global_httpd->add_data(HTTPD::MAIN_STREAM, (char *)buf, buf_size, type == AVIO_DATA_MARKER_SYNC_POINT, time, AVRational{ AV_TIME_BASE, 1 });