git.sesse.net Git - nageru/blob - video_stream.cpp

   1 #include "video_stream.h"
   2
   3 extern "C" {
   4 #include <libavformat/avformat.h>
   5 #include <libavformat/avio.h>
   6 }
   7
   8 #include "chroma_subsampler.h"
   9 #include "context.h"
  10 #include "flow.h"
  11 #include "httpd.h"
  12 #include "jpeg_frame_view.h"
  13 #include "movit/util.h"
  14 #include "mux.h"
  15 #include "player.h"
  16 #include "util.h"
  17 #include "ycbcr_converter.h"
  18
  19 #include <epoxy/glx.h>
  20 #include <jpeglib.h>
  21 #include <unistd.h>
  22
  23 using namespace std;
  24
  25 extern HTTPD *global_httpd;
  26
  27 namespace {
  28
  29 string read_file(const string &filename)
  30 {
  31         FILE *fp = fopen(filename.c_str(), "rb");
  32         if (fp == nullptr) {
  33                 perror(filename.c_str());
  34                 return "";
  35         }
  36
  37         fseek(fp, 0, SEEK_END);
  38         long len = ftell(fp);
  39         rewind(fp);
  40
  41         string ret;
  42         ret.resize(len);
  43         fread(&ret[0], len, 1, fp);
  44         fclose(fp);
  45         return ret;
  46 }
  47
  48 }  // namespace
  49
  50 struct VectorDestinationManager {
  51         jpeg_destination_mgr pub;
  52         std::vector<uint8_t> dest;
  53
  54         VectorDestinationManager()
  55         {
  56                 pub.init_destination = init_destination_thunk;
  57                 pub.empty_output_buffer = empty_output_buffer_thunk;
  58                 pub.term_destination = term_destination_thunk;
  59         }
  60
  61         static void init_destination_thunk(j_compress_ptr ptr)
  62         {
  63                 ((VectorDestinationManager *)(ptr->dest))->init_destination();
  64         }
  65
  66         inline void init_destination()
  67         {
  68                 make_room(0);
  69         }
  70
  71         static boolean empty_output_buffer_thunk(j_compress_ptr ptr)
  72         {
  73                 return ((VectorDestinationManager *)(ptr->dest))->empty_output_buffer();
  74         }
  75
  76         inline bool empty_output_buffer()
  77         {
  78                 make_room(dest.size());  // Should ignore pub.free_in_buffer!
  79                 return true;
  80         }
  81
  82         inline void make_room(size_t bytes_used)
  83         {
  84                 dest.resize(bytes_used + 4096);
  85                 dest.resize(dest.capacity());
  86                 pub.next_output_byte = dest.data() + bytes_used;
  87                 pub.free_in_buffer = dest.size() - bytes_used;
  88         }
  89
  90         static void term_destination_thunk(j_compress_ptr ptr)
  91         {
  92                 ((VectorDestinationManager *)(ptr->dest))->term_destination();
  93         }
  94
  95         inline void term_destination()
  96         {
  97                 dest.resize(dest.size() - pub.free_in_buffer);
  98         }
  99 };
 100 static_assert(std::is_standard_layout<VectorDestinationManager>::value, "");
 101
 102 vector<uint8_t> encode_jpeg(const uint8_t *y_data, const uint8_t *cb_data, const uint8_t *cr_data, unsigned width, unsigned height)
 103 {
 104         VectorDestinationManager dest;
 105
 106         jpeg_compress_struct cinfo;
 107         jpeg_error_mgr jerr;
 108         cinfo.err = jpeg_std_error(&jerr);
 109         jpeg_create_compress(&cinfo);
 110
 111         cinfo.dest = (jpeg_destination_mgr *)&dest;
 112         cinfo.input_components = 3;
 113         cinfo.in_color_space = JCS_RGB;
 114         jpeg_set_defaults(&cinfo);
 115         constexpr int quality = 90;
 116         jpeg_set_quality(&cinfo, quality, /*force_baseline=*/false);
 117
 118         cinfo.image_width = width;
 119         cinfo.image_height = height;
 120         cinfo.raw_data_in = true;
 121         jpeg_set_colorspace(&cinfo, JCS_YCbCr);
 122         cinfo.comp_info[0].h_samp_factor = 2;
 123         cinfo.comp_info[0].v_samp_factor = 1;
 124         cinfo.comp_info[1].h_samp_factor = 1;
 125         cinfo.comp_info[1].v_samp_factor = 1;
 126         cinfo.comp_info[2].h_samp_factor = 1;
 127         cinfo.comp_info[2].v_samp_factor = 1;
 128         cinfo.CCIR601_sampling = true;  // Seems to be mostly ignored by libjpeg, though.
 129         jpeg_start_compress(&cinfo, true);
 130
 131         JSAMPROW yptr[8], cbptr[8], crptr[8];
 132         JSAMPARRAY data[3] = { yptr, cbptr, crptr };
 133         for (unsigned y = 0; y < height; y += 8) {
 134                 for (unsigned yy = 0; yy < 8; ++yy) {
 135                         yptr[yy] = const_cast<JSAMPROW>(&y_data[(y + yy) * width]);
 136                         cbptr[yy] = const_cast<JSAMPROW>(&cb_data[(y + yy) * width / 2]);
 137                         crptr[yy] = const_cast<JSAMPROW>(&cr_data[(y + yy) * width / 2]);
 138                 }
 139
 140                 jpeg_write_raw_data(&cinfo, data, /*num_lines=*/8);
 141         }
 142
 143         jpeg_finish_compress(&cinfo);
 144         jpeg_destroy_compress(&cinfo);
 145
 146         return move(dest.dest);
 147 }
 148
 149 VideoStream::VideoStream()
 150 {
 151         ycbcr_converter.reset(new YCbCrConverter(YCbCrConverter::OUTPUT_TO_DUAL_YCBCR, /*resource_pool=*/nullptr));
 152         ycbcr_semiplanar_converter.reset(new YCbCrConverter(YCbCrConverter::OUTPUT_TO_SEMIPLANAR, /*resource_pool=*/nullptr));
 153
 154         GLuint input_tex[num_interpolate_slots], gray_tex[num_interpolate_slots];
 155         GLuint fade_y_output_tex[num_interpolate_slots], fade_cbcr_output_tex[num_interpolate_slots];
 156         GLuint cb_tex[num_interpolate_slots], cr_tex[num_interpolate_slots];
 157
 158         glCreateTextures(GL_TEXTURE_2D_ARRAY, 10, input_tex);
 159         glCreateTextures(GL_TEXTURE_2D_ARRAY, 10, gray_tex);
 160         glCreateTextures(GL_TEXTURE_2D, 10, fade_y_output_tex);
 161         glCreateTextures(GL_TEXTURE_2D, 10, fade_cbcr_output_tex);
 162         glCreateTextures(GL_TEXTURE_2D, 10, cb_tex);
 163         glCreateTextures(GL_TEXTURE_2D, 10, cr_tex);
 164         check_error();
 165
 166         constexpr size_t width = 1280, height = 720;  // FIXME: adjustable width, height
 167         int levels = find_num_levels(width, height);
 168         for (size_t i = 0; i < num_interpolate_slots; ++i) {
 169                 glTextureStorage3D(input_tex[i], levels, GL_RGBA8, width, height, 2);
 170                 check_error();
 171                 glTextureStorage3D(gray_tex[i], levels, GL_R8, width, height, 2);
 172                 check_error();
 173                 glTextureStorage2D(fade_y_output_tex[i], 1, GL_R8, width, height);
 174                 check_error();
 175                 glTextureStorage2D(fade_cbcr_output_tex[i], 1, GL_RG8, width, height);
 176                 check_error();
 177                 glTextureStorage2D(cb_tex[i], 1, GL_R8, width / 2, height);
 178                 check_error();
 179                 glTextureStorage2D(cr_tex[i], 1, GL_R8, width / 2, height);
 180                 check_error();
 181
 182                 InterpolatedFrameResources resource;
 183                 resource.input_tex = input_tex[i];
 184                 resource.gray_tex = gray_tex[i];
 185                 resource.fade_y_output_tex = fade_y_output_tex[i];
 186                 resource.fade_cbcr_output_tex = fade_cbcr_output_tex[i];
 187                 resource.cb_tex = cb_tex[i];
 188                 resource.cr_tex = cr_tex[i];
 189                 glCreateFramebuffers(2, resource.input_fbos);
 190                 check_error();
 191                 glCreateFramebuffers(1, &resource.fade_fbo);
 192                 check_error();
 193
 194                 glNamedFramebufferTextureLayer(resource.input_fbos[0], GL_COLOR_ATTACHMENT0, input_tex[i], 0, 0);
 195                 check_error();
 196                 glNamedFramebufferTextureLayer(resource.input_fbos[0], GL_COLOR_ATTACHMENT1, gray_tex[i], 0, 0);
 197                 check_error();
 198                 glNamedFramebufferTextureLayer(resource.input_fbos[1], GL_COLOR_ATTACHMENT0, input_tex[i], 0, 1);
 199                 check_error();
 200                 glNamedFramebufferTextureLayer(resource.input_fbos[1], GL_COLOR_ATTACHMENT1, gray_tex[i], 0, 1);
 201                 check_error();
 202                 glNamedFramebufferTexture(resource.fade_fbo, GL_COLOR_ATTACHMENT0, fade_y_output_tex[i], 0);
 203                 check_error();
 204                 glNamedFramebufferTexture(resource.fade_fbo, GL_COLOR_ATTACHMENT1, fade_cbcr_output_tex[i], 0);
 205                 check_error();
 206
 207                 GLuint bufs[] = { GL_COLOR_ATTACHMENT0, GL_COLOR_ATTACHMENT1 };
 208                 glNamedFramebufferDrawBuffers(resource.input_fbos[0], 2, bufs);
 209                 check_error();
 210                 glNamedFramebufferDrawBuffers(resource.input_fbos[1], 2, bufs);
 211                 check_error();
 212                 glNamedFramebufferDrawBuffers(resource.fade_fbo, 2, bufs);
 213                 check_error();
 214
 215                 glCreateBuffers(1, &resource.pbo);
 216                 check_error();
 217                 glNamedBufferStorage(resource.pbo, width * height * 4, nullptr, GL_MAP_READ_BIT | GL_MAP_PERSISTENT_BIT);
 218                 check_error();
 219                 resource.pbo_contents = glMapNamedBufferRange(resource.pbo, 0, width * height * 4, GL_MAP_READ_BIT | GL_MAP_PERSISTENT_BIT);
 220                 interpolate_resources.push_back(resource);
 221         }
 222
 223         check_error();
 224
 225         compute_flow.reset(new DISComputeFlow(width, height, operating_point2));
 226         interpolate.reset(new Interpolate(operating_point2, /*split_ycbcr_output=*/true));
 227         interpolate_no_split.reset(new Interpolate(operating_point2, /*split_ycbcr_output=*/false));
 228         chroma_subsampler.reset(new ChromaSubsampler);
 229         check_error();
 230
 231         // The “last frame” is initially black.
 232         unique_ptr<uint8_t[]> y(new uint8_t[1280 * 720]);
 233         unique_ptr<uint8_t[]> cb_or_cr(new uint8_t[640 * 720]);
 234         memset(y.get(), 16, 1280 * 720);
 235         memset(cb_or_cr.get(), 128, 640 * 720);
 236         last_frame = encode_jpeg(y.get(), cb_or_cr.get(), cb_or_cr.get(), 1280, 720);
 237 }
 238
 239 VideoStream::~VideoStream() {}
 240
 241 void VideoStream::start()
 242 {
 243         AVFormatContext *avctx = avformat_alloc_context();
 244         avctx->oformat = av_guess_format("nut", nullptr, nullptr);
 245
 246         uint8_t *buf = (uint8_t *)av_malloc(MUX_BUFFER_SIZE);
 247         avctx->pb = avio_alloc_context(buf, MUX_BUFFER_SIZE, 1, this, nullptr, nullptr, nullptr);
 248         avctx->pb->write_data_type = &VideoStream::write_packet2_thunk;
 249         avctx->pb->ignore_boundary_point = 1;
 250
 251         Mux::Codec video_codec = Mux::CODEC_MJPEG;
 252
 253         avctx->flags = AVFMT_FLAG_CUSTOM_IO;
 254
 255         string video_extradata;
 256
 257         constexpr int width = 1280, height = 720;  // Doesn't matter for MJPEG.
 258         stream_mux.reset(new Mux(avctx, width, height, video_codec, video_extradata, /*audio_codec_parameters=*/nullptr, COARSE_TIMEBASE,
 259                 /*write_callback=*/nullptr, Mux::WRITE_FOREGROUND, {}));
 260
 261
 262         encode_thread = thread(&VideoStream::encode_thread_func, this);
 263 }
 264
 265 void VideoStream::stop()
 266 {
 267         encode_thread.join();
 268 }
 269
 270 void VideoStream::schedule_original_frame(int64_t output_pts, unsigned stream_idx, int64_t input_pts)
 271 {
 272         fprintf(stderr, "output_pts=%ld  original      input_pts=%ld\n", output_pts, input_pts);
 273
 274         QueuedFrame qf;
 275         qf.type = QueuedFrame::ORIGINAL;
 276         qf.output_pts = output_pts;
 277         qf.stream_idx = stream_idx;
 278         qf.input_first_pts = input_pts;
 279
 280         unique_lock<mutex> lock(queue_lock);
 281         frame_queue.push_back(qf);
 282         queue_nonempty.notify_all();
 283 }
 284
 285 void VideoStream::schedule_faded_frame(int64_t output_pts, unsigned stream_idx, int64_t input_pts, int secondary_stream_idx, int64_t secondary_input_pts, float fade_alpha)
 286 {
 287         fprintf(stderr, "output_pts=%ld  faded         input_pts=%ld,%ld  fade_alpha=%.2f\n", output_pts, input_pts, secondary_input_pts, fade_alpha);
 288
 289         // Get the temporary OpenGL resources we need for doing the fade.
 290         // (We share these with interpolated frames, which is slightly
 291         // overkill, but there's no need to waste resources on keeping
 292         // separate pools around.)
 293         InterpolatedFrameResources resources;
 294         {
 295                 unique_lock<mutex> lock(queue_lock);
 296                 if (interpolate_resources.empty()) {
 297                         fprintf(stderr, "WARNING: Too many interpolated frames already in transit; dropping one.\n");
 298                         return;
 299                 }
 300                 resources = interpolate_resources.front();
 301                 interpolate_resources.pop_front();
 302         }
 303
 304         bool did_decode;
 305
 306         JPEGID jpeg_id1;
 307         jpeg_id1.stream_idx = stream_idx;
 308         jpeg_id1.pts = input_pts;
 309         jpeg_id1.interpolated = false;
 310         shared_ptr<Frame> frame1 = decode_jpeg_with_cache(jpeg_id1, DECODE_IF_NOT_IN_CACHE, &did_decode);
 311
 312         JPEGID jpeg_id2;
 313         jpeg_id2.stream_idx = secondary_stream_idx;
 314         jpeg_id2.pts = secondary_input_pts;
 315         jpeg_id2.interpolated = false;
 316         shared_ptr<Frame> frame2 = decode_jpeg_with_cache(jpeg_id2, DECODE_IF_NOT_IN_CACHE, &did_decode);
 317
 318         ycbcr_semiplanar_converter->prepare_chain_for_fade(frame1, frame2, fade_alpha)->render_to_fbo(resources.fade_fbo, 1280, 720);
 319
 320         QueuedFrame qf;
 321         qf.type = QueuedFrame::FADED;
 322         qf.output_pts = output_pts;
 323         qf.stream_idx = stream_idx;
 324         qf.resources = resources;
 325         qf.input_first_pts = input_pts;
 326
 327         qf.secondary_stream_idx = secondary_stream_idx;
 328         qf.secondary_input_pts = secondary_input_pts;
 329
 330         // Subsample and split Cb/Cr.
 331         chroma_subsampler->subsample_chroma(resources.fade_cbcr_output_tex, 1280, 720, resources.cb_tex, resources.cr_tex);
 332
 333         // Read it down (asynchronously) to the CPU.
 334         glPixelStorei(GL_PACK_ROW_LENGTH, 0);
 335         glBindBuffer(GL_PIXEL_PACK_BUFFER, resources.pbo);
 336         check_error();
 337         glGetTextureImage(resources.fade_y_output_tex, 0, GL_RED, GL_UNSIGNED_BYTE, 1280 * 720 * 4, BUFFER_OFFSET(0));
 338         check_error();
 339         glGetTextureImage(resources.cb_tex, 0, GL_RED, GL_UNSIGNED_BYTE, 1280 * 720 * 3, BUFFER_OFFSET(1280 * 720));
 340         check_error();
 341         glGetTextureImage(resources.cr_tex, 0, GL_RED, GL_UNSIGNED_BYTE, 1280 * 720 * 3 - 640 * 720, BUFFER_OFFSET(1280 * 720 + 640 * 720));
 342         check_error();
 343         glBindBuffer(GL_PIXEL_PACK_BUFFER, 0);
 344
 345         // Set a fence we can wait for to make sure the CPU sees the read.
 346         glMemoryBarrier(GL_CLIENT_MAPPED_BUFFER_BARRIER_BIT);
 347         check_error();
 348         qf.fence = RefCountedGLsync(GL_SYNC_GPU_COMMANDS_COMPLETE, /*flags=*/0);
 349         check_error();
 350
 351         unique_lock<mutex> lock(queue_lock);
 352         frame_queue.push_back(qf);
 353         queue_nonempty.notify_all();
 354 }
 355
 356 void VideoStream::schedule_interpolated_frame(int64_t output_pts, unsigned stream_idx, int64_t input_first_pts, int64_t input_second_pts, float alpha, int secondary_stream_idx, int64_t secondary_input_pts, float fade_alpha)
 357 {
 358         if (secondary_stream_idx != -1) {
 359                 fprintf(stderr, "output_pts=%ld  interpolated  input_pts1=%ld input_pts2=%ld alpha=%.3f  secondary_pts=%ld  fade_alpha=%.2f\n", output_pts, input_first_pts, input_second_pts, alpha, secondary_input_pts, fade_alpha);
 360         } else {
 361                 fprintf(stderr, "output_pts=%ld  interpolated  input_pts1=%ld input_pts2=%ld alpha=%.3f\n", output_pts, input_first_pts, input_second_pts, alpha);
 362         }
 363
 364         JPEGID id;
 365         if (secondary_stream_idx == -1) {
 366                 id = JPEGID{ stream_idx, output_pts, /*interpolated=*/true };
 367         } else {
 368                 id = create_jpegid_for_interpolated_fade(stream_idx, output_pts, secondary_stream_idx, secondary_input_pts);
 369         }
 370
 371         // Get the temporary OpenGL resources we need for doing the interpolation.
 372         InterpolatedFrameResources resources;
 373         {
 374                 unique_lock<mutex> lock(queue_lock);
 375                 if (interpolate_resources.empty()) {
 376                         fprintf(stderr, "WARNING: Too many interpolated frames already in transit; dropping one.\n");
 377                         JPEGFrameView::insert_interpolated_frame(id, nullptr);
 378                         return;
 379                 }
 380                 resources = interpolate_resources.front();
 381                 interpolate_resources.pop_front();
 382         }
 383
 384         QueuedFrame qf;
 385         qf.type = (secondary_stream_idx == -1) ? QueuedFrame::INTERPOLATED : QueuedFrame::FADED_INTERPOLATED;
 386         qf.output_pts = output_pts;
 387         qf.stream_idx = stream_idx;
 388         qf.resources = resources;
 389         qf.id = id;
 390
 391         check_error();
 392
 393         // Convert frame0 and frame1 to OpenGL textures.
 394         for (size_t frame_no = 0; frame_no < 2; ++frame_no) {
 395                 JPEGID jpeg_id;
 396                 jpeg_id.stream_idx = stream_idx;
 397                 jpeg_id.pts = frame_no == 1 ? input_second_pts : input_first_pts;
 398                 jpeg_id.interpolated = false;
 399                 bool did_decode;
 400                 shared_ptr<Frame> frame = decode_jpeg_with_cache(jpeg_id, DECODE_IF_NOT_IN_CACHE, &did_decode);
 401                 ycbcr_converter->prepare_chain_for_conversion(frame)->render_to_fbo(resources.input_fbos[frame_no], 1280, 720);
 402         }
 403
 404         glGenerateTextureMipmap(resources.input_tex);
 405         check_error();
 406         glGenerateTextureMipmap(resources.gray_tex);
 407         check_error();
 408
 409         // Compute the interpolated frame.
 410         qf.flow_tex = compute_flow->exec(resources.gray_tex, DISComputeFlow::FORWARD_AND_BACKWARD, DISComputeFlow::DO_NOT_RESIZE_FLOW);
 411         check_error();
 412
 413         if (secondary_stream_idx != -1) {
 414                 // Fade. First kick off the interpolation.
 415                 tie(qf.output_tex, ignore) = interpolate_no_split->exec(resources.input_tex, resources.gray_tex, qf.flow_tex, 1280, 720, alpha);
 416                 check_error();
 417
 418                 // Now decode the image we are fading against.
 419                 JPEGID jpeg_id;
 420                 jpeg_id.stream_idx = secondary_stream_idx;
 421                 jpeg_id.pts = secondary_input_pts;
 422                 jpeg_id.interpolated = false;
 423                 bool did_decode;
 424                 shared_ptr<Frame> frame2 = decode_jpeg_with_cache(jpeg_id, DECODE_IF_NOT_IN_CACHE, &did_decode);
 425
 426                 // Then fade against it, putting it into the fade Y' and CbCr textures.
 427                 ycbcr_semiplanar_converter->prepare_chain_for_fade_from_texture(qf.output_tex, frame2, fade_alpha)->render_to_fbo(resources.fade_fbo, 1280, 720);
 428
 429                 // Subsample and split Cb/Cr.
 430                 chroma_subsampler->subsample_chroma(resources.fade_cbcr_output_tex, 1280, 720, resources.cb_tex, resources.cr_tex);
 431         } else {
 432                 tie(qf.output_tex, qf.cbcr_tex) = interpolate->exec(resources.input_tex, resources.gray_tex, qf.flow_tex, 1280, 720, alpha);
 433                 check_error();
 434
 435                 // Subsample and split Cb/Cr.
 436                 chroma_subsampler->subsample_chroma(qf.cbcr_tex, 1280, 720, resources.cb_tex, resources.cr_tex);
 437         }
 438
 439         // We could have released qf.flow_tex here, but to make sure we don't cause a stall
 440         // when trying to reuse it for the next frame, we can just as well hold on to it
 441         // and release it only when the readback is done.
 442
 443         // Read it down (asynchronously) to the CPU.
 444         glPixelStorei(GL_PACK_ROW_LENGTH, 0);
 445         glBindBuffer(GL_PIXEL_PACK_BUFFER, resources.pbo);
 446         check_error();
 447         if (secondary_stream_idx != -1) {
 448                 glGetTextureImage(resources.fade_y_output_tex, 0, GL_RED, GL_UNSIGNED_BYTE, 1280 * 720 * 4, BUFFER_OFFSET(0));
 449         } else {
 450                 glGetTextureImage(qf.output_tex, 0, GL_RED, GL_UNSIGNED_BYTE, 1280 * 720 * 4, BUFFER_OFFSET(0));
 451         }
 452         check_error();
 453         glGetTextureImage(resources.cb_tex, 0, GL_RED, GL_UNSIGNED_BYTE, 1280 * 720 * 3, BUFFER_OFFSET(1280 * 720));
 454         check_error();
 455         glGetTextureImage(resources.cr_tex, 0, GL_RED, GL_UNSIGNED_BYTE, 1280 * 720 * 3 - 640 * 720, BUFFER_OFFSET(1280 * 720 + 640 * 720));
 456         check_error();
 457         glBindBuffer(GL_PIXEL_PACK_BUFFER, 0);
 458
 459         // Set a fence we can wait for to make sure the CPU sees the read.
 460         glMemoryBarrier(GL_CLIENT_MAPPED_BUFFER_BARRIER_BIT);
 461         check_error();
 462         qf.fence = RefCountedGLsync(GL_SYNC_GPU_COMMANDS_COMPLETE, /*flags=*/0);
 463         check_error();
 464
 465         unique_lock<mutex> lock(queue_lock);
 466         frame_queue.push_back(qf);
 467         queue_nonempty.notify_all();
 468 }
 469
 470 void VideoStream::schedule_refresh_frame(int64_t output_pts)
 471 {
 472         AVPacket pkt;
 473         av_init_packet(&pkt);
 474         pkt.stream_index = 0;
 475         pkt.data = (uint8_t *)last_frame.data();
 476         pkt.size = last_frame.size();
 477         stream_mux->add_packet(pkt, output_pts, output_pts);
 478 }
 479
 480 namespace {
 481
 482 shared_ptr<Frame> frame_from_pbo(void *contents, size_t width, size_t height)
 483 {
 484         size_t chroma_width = width / 2;
 485
 486         const uint8_t *y = (const uint8_t *)contents;
 487         const uint8_t *cb = (const uint8_t *)contents + width * height;
 488         const uint8_t *cr = (const uint8_t *)contents + width * height + chroma_width * height;
 489
 490         shared_ptr<Frame> frame(new Frame);
 491         frame->y.reset(new uint8_t[width * height]);
 492         frame->cb.reset(new uint8_t[chroma_width * height]);
 493         frame->cr.reset(new uint8_t[chroma_width * height]);
 494         for (unsigned yy = 0; yy < height; ++yy) {
 495                 memcpy(frame->y.get() + width * yy, y + width * yy, width);
 496                 memcpy(frame->cb.get() + chroma_width * yy, cb + chroma_width * yy, chroma_width);
 497                 memcpy(frame->cr.get() + chroma_width * yy, cr + chroma_width * yy, chroma_width);
 498         }
 499         frame->is_semiplanar = false;
 500         frame->width = width;
 501         frame->height = height;
 502         frame->chroma_subsampling_x = 2;
 503         frame->chroma_subsampling_y = 1;
 504         frame->pitch_y = width;
 505         frame->pitch_chroma = chroma_width;
 506         return frame;
 507 }
 508
 509 }  // namespace
 510
 511 void VideoStream::encode_thread_func()
 512 {
 513         pthread_setname_np(pthread_self(), "VideoStream");
 514         QSurface *surface = create_surface();
 515         QOpenGLContext *context = create_context(surface);
 516         bool ok = make_current(context, surface);
 517         if (!ok) {
 518                 fprintf(stderr, "Video stream couldn't get an OpenGL context\n");
 519                 exit(1);
 520         }
 521
 522         for ( ;; ) {
 523                 QueuedFrame qf;
 524                 {
 525                         unique_lock<mutex> lock(queue_lock);
 526                         queue_nonempty.wait(lock, [this]{
 527                                 return !frame_queue.empty();
 528                         });
 529                         qf = frame_queue.front();
 530                         frame_queue.pop_front();
 531                 }
 532
 533                 if (qf.type == QueuedFrame::ORIGINAL) {
 534                         // Send the JPEG frame on, unchanged.
 535                         string jpeg = read_file(filename_for_frame(qf.stream_idx, qf.input_first_pts));
 536                         AVPacket pkt;
 537                         av_init_packet(&pkt);
 538                         pkt.stream_index = 0;
 539                         pkt.data = (uint8_t *)jpeg.data();
 540                         pkt.size = jpeg.size();
 541                         stream_mux->add_packet(pkt, qf.output_pts, qf.output_pts);
 542
 543                         last_frame.assign(&jpeg[0], &jpeg[0] + jpeg.size());
 544                 } else if (qf.type == QueuedFrame::FADED) {
 545                         glClientWaitSync(qf.fence.get(), /*flags=*/0, GL_TIMEOUT_IGNORED);
 546
 547                         shared_ptr<Frame> frame = frame_from_pbo(qf.resources.pbo_contents, 1280, 720);
 548
 549                         // Now JPEG encode it, and send it on to the stream.
 550                         vector<uint8_t> jpeg = encode_jpeg(frame->y.get(), frame->cb.get(), frame->cr.get(), 1280, 720);
 551
 552                         AVPacket pkt;
 553                         av_init_packet(&pkt);
 554                         pkt.stream_index = 0;
 555                         pkt.data = (uint8_t *)jpeg.data();
 556                         pkt.size = jpeg.size();
 557                         stream_mux->add_packet(pkt, qf.output_pts, qf.output_pts);
 558                         last_frame = move(jpeg);
 559
 560                         // Put the frame resources back.
 561                         unique_lock<mutex> lock(queue_lock);
 562                         interpolate_resources.push_back(qf.resources);
 563                 } else if (qf.type == QueuedFrame::INTERPOLATED || qf.type == QueuedFrame::FADED_INTERPOLATED) {
 564                         glClientWaitSync(qf.fence.get(), /*flags=*/0, GL_TIMEOUT_IGNORED);
 565
 566                         // Send a copy of the frame on to display.
 567                         shared_ptr<Frame> frame = frame_from_pbo(qf.resources.pbo_contents, 1280, 720);
 568                         JPEGFrameView::insert_interpolated_frame(qf.id, frame);
 569
 570                         // Now JPEG encode it, and send it on to the stream.
 571                         vector<uint8_t> jpeg = encode_jpeg(frame->y.get(), frame->cb.get(), frame->cr.get(), 1280, 720);
 572                         compute_flow->release_texture(qf.flow_tex);
 573                         if (qf.type != QueuedFrame::FADED_INTERPOLATED) {
 574                                 interpolate->release_texture(qf.output_tex);
 575                                 interpolate->release_texture(qf.cbcr_tex);
 576                         }
 577
 578                         AVPacket pkt;
 579                         av_init_packet(&pkt);
 580                         pkt.stream_index = 0;
 581                         pkt.data = (uint8_t *)jpeg.data();
 582                         pkt.size = jpeg.size();
 583                         stream_mux->add_packet(pkt, qf.output_pts, qf.output_pts);
 584                         last_frame = move(jpeg);
 585
 586                         // Put the frame resources back.
 587                         unique_lock<mutex> lock(queue_lock);
 588                         interpolate_resources.push_back(qf.resources);
 589                 } else {
 590                         assert(false);
 591                 }
 592         }
 593 }
 594
 595 int VideoStream::write_packet2_thunk(void *opaque, uint8_t *buf, int buf_size, AVIODataMarkerType type, int64_t time)
 596 {
 597         VideoStream *video_stream = (VideoStream *)opaque;
 598         return video_stream->write_packet2(buf, buf_size, type, time);
 599 }
 600
 601 int VideoStream::write_packet2(uint8_t *buf, int buf_size, AVIODataMarkerType type, int64_t time)
 602 {
 603         if (type == AVIO_DATA_MARKER_SYNC_POINT || type == AVIO_DATA_MARKER_BOUNDARY_POINT) {
 604                 seen_sync_markers = true;
 605         } else if (type == AVIO_DATA_MARKER_UNKNOWN && !seen_sync_markers) {
 606                 // We don't know if this is a keyframe or not (the muxer could
 607                 // avoid marking it), so we just have to make the best of it.
 608                 type = AVIO_DATA_MARKER_SYNC_POINT;
 609         }
 610
 611         if (type == AVIO_DATA_MARKER_HEADER) {
 612                 stream_mux_header.append((char *)buf, buf_size);
 613                 global_httpd->set_header(stream_mux_header);
 614         } else {
 615                 global_httpd->add_data((char *)buf, buf_size, type == AVIO_DATA_MARKER_SYNC_POINT, time, AVRational{ AV_TIME_BASE, 1 });
 616         }
 617         return buf_size;
 618 }