1 #include "video_stream.h"
4 #include <libavformat/avformat.h>
5 #include <libavformat/avio.h>
14 #include "jpeg_frame_view.h"
15 #include "movit/util.h"
20 #include <epoxy/glx.h>
24 extern HTTPD *global_httpd;
28 string read_file(const string &filename)
30 FILE *fp = fopen(filename.c_str(), "rb");
32 perror(filename.c_str());
36 fseek(fp, 0, SEEK_END);
42 fread(&ret[0], len, 1, fp);
49 struct VectorDestinationManager {
50 jpeg_destination_mgr pub;
51 std::vector<uint8_t> dest;
53 VectorDestinationManager()
55 pub.init_destination = init_destination_thunk;
56 pub.empty_output_buffer = empty_output_buffer_thunk;
57 pub.term_destination = term_destination_thunk;
60 static void init_destination_thunk(j_compress_ptr ptr)
62 ((VectorDestinationManager *)(ptr->dest))->init_destination();
65 inline void init_destination()
70 static boolean empty_output_buffer_thunk(j_compress_ptr ptr)
72 return ((VectorDestinationManager *)(ptr->dest))->empty_output_buffer();
75 inline bool empty_output_buffer()
77 make_room(dest.size()); // Should ignore pub.free_in_buffer!
81 inline void make_room(size_t bytes_used)
83 dest.resize(bytes_used + 4096);
84 dest.resize(dest.capacity());
85 pub.next_output_byte = dest.data() + bytes_used;
86 pub.free_in_buffer = dest.size() - bytes_used;
89 static void term_destination_thunk(j_compress_ptr ptr)
91 ((VectorDestinationManager *)(ptr->dest))->term_destination();
94 inline void term_destination()
96 dest.resize(dest.size() - pub.free_in_buffer);
99 static_assert(std::is_standard_layout<VectorDestinationManager>::value, "");
101 vector<uint8_t> encode_jpeg(const uint8_t *pixel_data, unsigned width, unsigned height)
103 VectorDestinationManager dest;
105 jpeg_compress_struct cinfo;
107 cinfo.err = jpeg_std_error(&jerr);
108 jpeg_create_compress(&cinfo);
110 cinfo.dest = (jpeg_destination_mgr *)&dest;
111 cinfo.input_components = 3;
112 cinfo.in_color_space = JCS_RGB;
113 jpeg_set_defaults(&cinfo);
114 constexpr int quality = 90;
115 jpeg_set_quality(&cinfo, quality, /*force_baseline=*/false);
117 cinfo.image_width = width;
118 cinfo.image_height = height;
119 cinfo.input_components = 3;
120 cinfo.comp_info[0].h_samp_factor = 2;
121 cinfo.comp_info[0].v_samp_factor = 1;
122 cinfo.comp_info[1].h_samp_factor = 1;
123 cinfo.comp_info[1].v_samp_factor = 1;
124 cinfo.comp_info[2].h_samp_factor = 1;
125 cinfo.comp_info[2].v_samp_factor = 1;
126 // cinfo.CCIR601_sampling = true; // TODO: Subsample ourselves.
127 jpeg_start_compress(&cinfo, true);
129 unique_ptr<uint8_t[]> row(new uint8_t[width * 3]);
130 JSAMPROW row_pointer[1] = { row.get() };
131 for (unsigned y = 0; y < height; ++y) {
132 const uint8_t *sptr = &pixel_data[(height - cinfo.next_scanline - 1) * width * 4];
133 uint8_t *dptr = row.get();
134 for (unsigned x = 0; x < width; ++x) {
140 (void) jpeg_write_scanlines(&cinfo, row_pointer, 1);
143 jpeg_finish_compress(&cinfo);
144 jpeg_destroy_compress(&cinfo);
146 return move(dest.dest);
149 VideoStream::VideoStream()
151 using namespace movit;
152 // TODO: deduplicate code against JPEGFrameView?
153 ycbcr_convert_chain.reset(new EffectChain(1280, 720));
154 ImageFormat image_format;
155 image_format.color_space = COLORSPACE_sRGB;
156 image_format.gamma_curve = GAMMA_sRGB;
157 ycbcr_format.luma_coefficients = YCBCR_REC_709;
158 ycbcr_format.full_range = true; // JPEG.
159 ycbcr_format.num_levels = 256;
160 ycbcr_format.chroma_subsampling_x = 2;
161 ycbcr_format.chroma_subsampling_y = 1;
162 ycbcr_format.cb_x_position = 0.0f; // H.264 -- _not_ JPEG, even though our input is MJPEG-encoded
163 ycbcr_format.cb_y_position = 0.5f; // Irrelevant.
164 ycbcr_format.cr_x_position = 0.0f;
165 ycbcr_format.cr_y_position = 0.5f;
166 ycbcr_input = (movit::YCbCrInput *)ycbcr_convert_chain->add_input(new YCbCrInput(image_format, ycbcr_format, 1280, 720));
168 ImageFormat inout_format;
169 inout_format.color_space = COLORSPACE_sRGB;
170 inout_format.gamma_curve = GAMMA_sRGB;
173 ycbcr_convert_chain->add_output(inout_format, OUTPUT_ALPHA_FORMAT_POSTMULTIPLIED);
175 ycbcr_convert_chain->set_dither_bits(8);
177 ycbcr_convert_chain->finalize();
180 GLuint input_tex[num_interpolate_slots], gray_tex[num_interpolate_slots];
181 glCreateTextures(GL_TEXTURE_2D_ARRAY, 10, input_tex);
182 glCreateTextures(GL_TEXTURE_2D_ARRAY, 10, gray_tex);
184 constexpr size_t width = 1280, height = 720; // FIXME: adjustable width, height
185 int levels = find_num_levels(width, height);
186 for (size_t i = 0; i < num_interpolate_slots; ++i) {
187 glTextureStorage3D(input_tex[i], levels, GL_RGBA8, width, height, 2);
189 glTextureStorage3D(gray_tex[i], levels, GL_R8, width, height, 2);
192 InterpolatedFrameResources resource;
193 resource.input_tex = input_tex[i];
194 resource.gray_tex = gray_tex[i];
195 glCreateFramebuffers(2, resource.input_fbos);
198 glNamedFramebufferTextureLayer(resource.input_fbos[0], GL_COLOR_ATTACHMENT0, input_tex[i], 0, 0);
200 glNamedFramebufferTextureLayer(resource.input_fbos[1], GL_COLOR_ATTACHMENT0, input_tex[i], 0, 1);
203 GLuint buf = GL_COLOR_ATTACHMENT0;
204 glNamedFramebufferDrawBuffers(resource.input_fbos[0], 1, &buf);
206 glNamedFramebufferDrawBuffers(resource.input_fbos[1], 1, &buf);
209 glCreateBuffers(1, &resource.pbo);
211 glNamedBufferStorage(resource.pbo, width * height * 4, nullptr, GL_MAP_READ_BIT | GL_MAP_PERSISTENT_BIT);
213 resource.pbo_contents = glMapNamedBufferRange(resource.pbo, 0, width * height * 4, GL_MAP_READ_BIT | GL_MAP_PERSISTENT_BIT);
214 interpolate_resources.push_back(resource);
219 compute_flow.reset(new DISComputeFlow(width, height, operating_point3));
220 gray.reset(new GrayscaleConversion); // NOTE: Must come after DISComputeFlow, since it sets up the VBO!
221 interpolate.reset(new Interpolate(width, height, operating_point3));
225 VideoStream::~VideoStream() {}
227 void VideoStream::start()
229 AVFormatContext *avctx = avformat_alloc_context();
230 avctx->oformat = av_guess_format("nut", nullptr, nullptr);
232 uint8_t *buf = (uint8_t *)av_malloc(MUX_BUFFER_SIZE);
233 avctx->pb = avio_alloc_context(buf, MUX_BUFFER_SIZE, 1, this, nullptr, nullptr, nullptr);
234 avctx->pb->write_data_type = &VideoStream::write_packet2_thunk;
235 avctx->pb->ignore_boundary_point = 1;
237 Mux::Codec video_codec = Mux::CODEC_MJPEG;
239 avctx->flags = AVFMT_FLAG_CUSTOM_IO;
241 string video_extradata;
243 constexpr int width = 1280, height = 720; // Doesn't matter for MJPEG.
244 stream_mux.reset(new Mux(avctx, width, height, video_codec, video_extradata, /*audio_codec_parameters=*/nullptr, COARSE_TIMEBASE,
245 /*write_callback=*/nullptr, Mux::WRITE_FOREGROUND, {}));
248 encode_thread = thread(&VideoStream::encode_thread_func, this);
251 void VideoStream::stop()
253 encode_thread.join();
256 void VideoStream::schedule_original_frame(int64_t output_pts, unsigned stream_idx, int64_t input_pts)
258 fprintf(stderr, "output_pts=%ld original input_pts=%ld\n", output_pts, input_pts);
261 qf.type = QueuedFrame::ORIGINAL;
262 qf.output_pts = output_pts;
263 qf.stream_idx = stream_idx;
264 qf.input_first_pts = input_pts;
266 unique_lock<mutex> lock(queue_lock);
267 frame_queue.push_back(qf);
268 queue_nonempty.notify_all();
271 void VideoStream::schedule_interpolated_frame(int64_t output_pts, unsigned stream_idx, int64_t input_first_pts, int64_t input_second_pts, float alpha)
273 fprintf(stderr, "output_pts=%ld interpolated input_pts1=%ld input_pts2=%ld alpha=%.3f\n", output_pts, input_first_pts, input_second_pts, alpha);
275 // Get the temporary OpenGL resources we need for doing the interpolation.
276 InterpolatedFrameResources resources;
278 unique_lock<mutex> lock(queue_lock);
279 if (interpolate_resources.empty()) {
280 fprintf(stderr, "WARNING: Too many interpolated frames already in transit; dropping one.\n");
283 resources = interpolate_resources.front();
284 interpolate_resources.pop_front();
288 qf.type = QueuedFrame::INTERPOLATED;
289 qf.output_pts = output_pts;
290 qf.stream_idx = stream_idx;
291 qf.resources = resources;
295 // Convert frame0 and frame1 to OpenGL textures.
296 // TODO: Deduplicate against JPEGFrameView::setDecodedFrame?
297 for (size_t frame_no = 0; frame_no < 2; ++frame_no) {
299 jpeg_id.stream_idx = stream_idx;
300 jpeg_id.pts = frame_no == 1 ? input_second_pts : input_first_pts;
302 shared_ptr<Frame> frame = decode_jpeg_with_cache(jpeg_id, DECODE_IF_NOT_IN_CACHE, &did_decode);
303 ycbcr_format.chroma_subsampling_x = frame->chroma_subsampling_x;
304 ycbcr_format.chroma_subsampling_y = frame->chroma_subsampling_y;
305 ycbcr_input->change_ycbcr_format(ycbcr_format);
306 ycbcr_input->set_width(frame->width);
307 ycbcr_input->set_height(frame->height);
308 ycbcr_input->set_pixel_data(0, frame->y.get());
309 ycbcr_input->set_pixel_data(1, frame->cb.get());
310 ycbcr_input->set_pixel_data(2, frame->cr.get());
311 ycbcr_input->set_pitch(0, frame->pitch_y);
312 ycbcr_input->set_pitch(1, frame->pitch_chroma);
313 ycbcr_input->set_pitch(2, frame->pitch_chroma);
314 ycbcr_convert_chain->render_to_fbo(resources.input_fbos[frame_no], 1280, 720);
317 glGenerateTextureMipmap(resources.input_tex);
319 // Compute the interpolated frame.
321 gray->exec(resources.input_tex, resources.gray_tex, 1280, 720, /*num_layers=*/2);
323 glGenerateTextureMipmap(resources.gray_tex);
325 qf.flow_tex = compute_flow->exec(resources.gray_tex, DISComputeFlow::FORWARD_AND_BACKWARD, DISComputeFlow::DO_NOT_RESIZE_FLOW);
328 qf.output_tex = interpolate->exec(resources.input_tex, qf.flow_tex, 1280, 720, alpha);
331 // We could have released qf.flow_tex here, but to make sure we don't cause a stall
332 // when trying to reuse it for the next frame, we can just as well hold on to it
333 // and release it only when the readback is done.
335 // Read it down (asynchronously) to the CPU.
336 glPixelStorei(GL_PACK_ROW_LENGTH, 0);
337 glBindBuffer(GL_PIXEL_PACK_BUFFER, resources.pbo);
339 glGetTextureImage(qf.output_tex, 0, GL_RGBA, GL_UNSIGNED_BYTE, 1280 * 720 * 4, nullptr);
341 glBindBuffer(GL_PIXEL_PACK_BUFFER, 0);
343 // Set a fence we can wait for to make sure the CPU sees the read.
344 glMemoryBarrier(GL_CLIENT_MAPPED_BUFFER_BARRIER_BIT);
346 qf.fence = RefCountedGLsync(GL_SYNC_GPU_COMMANDS_COMPLETE, /*flags=*/0);
349 unique_lock<mutex> lock(queue_lock);
350 frame_queue.push_back(qf);
351 queue_nonempty.notify_all();
354 void VideoStream::encode_thread_func()
356 pthread_setname_np(pthread_self(), "VideoStream");
357 QSurface *surface = create_surface();
358 QOpenGLContext *context = create_context(surface);
359 bool ok = make_current(context, surface);
361 fprintf(stderr, "Video stream couldn't get an OpenGL context\n");
368 unique_lock<mutex> lock(queue_lock);
369 queue_nonempty.wait(lock, [this]{
370 return !frame_queue.empty();
372 qf = frame_queue.front();
373 frame_queue.pop_front();
376 if (qf.type == QueuedFrame::ORIGINAL) {
377 // Send the JPEG frame on, unchanged.
378 string jpeg = read_file(filename_for_frame(qf.stream_idx, qf.input_first_pts));
380 av_init_packet(&pkt);
381 pkt.stream_index = 0;
382 pkt.data = (uint8_t *)jpeg.data();
383 pkt.size = jpeg.size();
384 stream_mux->add_packet(pkt, qf.output_pts, qf.output_pts);
385 } else if (qf.type == QueuedFrame::INTERPOLATED) {
386 glClientWaitSync(qf.fence.get(), /*flags=*/0, GL_TIMEOUT_IGNORED);
388 vector<uint8_t> jpeg = encode_jpeg((const uint8_t *)qf.resources.pbo_contents, 1280, 720);
389 compute_flow->release_texture(qf.flow_tex);
390 interpolate->release_texture(qf.output_tex);
393 av_init_packet(&pkt);
394 pkt.stream_index = 0;
395 pkt.data = (uint8_t *)jpeg.data();
396 pkt.size = jpeg.size();
397 stream_mux->add_packet(pkt, qf.output_pts, qf.output_pts);
399 // Put the frame resources back.
400 unique_lock<mutex> lock(queue_lock);
401 interpolate_resources.push_back(qf.resources);
406 int VideoStream::write_packet2_thunk(void *opaque, uint8_t *buf, int buf_size, AVIODataMarkerType type, int64_t time)
408 VideoStream *video_stream = (VideoStream *)opaque;
409 return video_stream->write_packet2(buf, buf_size, type, time);
412 int VideoStream::write_packet2(uint8_t *buf, int buf_size, AVIODataMarkerType type, int64_t time)
414 if (type == AVIO_DATA_MARKER_SYNC_POINT || type == AVIO_DATA_MARKER_BOUNDARY_POINT) {
415 seen_sync_markers = true;
416 } else if (type == AVIO_DATA_MARKER_UNKNOWN && !seen_sync_markers) {
417 // We don't know if this is a keyframe or not (the muxer could
418 // avoid marking it), so we just have to make the best of it.
419 type = AVIO_DATA_MARKER_SYNC_POINT;
422 if (type == AVIO_DATA_MARKER_HEADER) {
423 stream_mux_header.append((char *)buf, buf_size);
424 global_httpd->set_header(stream_mux_header);
426 global_httpd->add_data((char *)buf, buf_size, type == AVIO_DATA_MARKER_SYNC_POINT, time, AVRational{ AV_TIME_BASE, 1 });