1 #include "jpeg_frame_view.h"
7 #include <condition_variable>
13 #include <movit/resource_pool.h>
14 #include <movit/init.h>
15 #include <movit/util.h>
18 #include "post_to_main_thread.h"
19 #include "video_stream.h"
21 using namespace movit;
28 bool operator< (const JPEGID &a, const JPEGID &b) {
29 return make_pair(a.stream_idx, a.pts) < make_pair(b.stream_idx, b.pts);
33 shared_ptr<Frame> frame;
38 map<JPEGID, LRUFrame> cache; // Under cache_mu.
39 condition_variable any_pending_decodes;
40 deque<pair<JPEGID, JPEGFrameView *>> pending_decodes; // Under cache_mu.
41 atomic<size_t> event_counter{0};
42 extern QGLWidget *global_share_widget;
44 // TODO: Decode using VA-API if available.
45 shared_ptr<Frame> decode_jpeg(const string &filename)
47 shared_ptr<Frame> frame(new Frame);
49 jpeg_decompress_struct dinfo;
51 dinfo.err = jpeg_std_error(&jerr);
52 jpeg_create_decompress(&dinfo);
54 FILE *fp = fopen(filename.c_str(), "rb");
56 perror(filename.c_str());
59 jpeg_stdio_src(&dinfo, fp);
61 jpeg_read_header(&dinfo, true);
63 if (dinfo.num_components != 3) {
64 fprintf(stderr, "Not a color JPEG. (%d components, Y=%dx%d, Cb=%dx%d, Cr=%dx%d)\n",
66 dinfo.comp_info[0].h_samp_factor, dinfo.comp_info[0].v_samp_factor,
67 dinfo.comp_info[1].h_samp_factor, dinfo.comp_info[1].v_samp_factor,
68 dinfo.comp_info[2].h_samp_factor, dinfo.comp_info[2].v_samp_factor);
71 if (dinfo.comp_info[0].h_samp_factor != dinfo.max_h_samp_factor ||
72 dinfo.comp_info[0].v_samp_factor != dinfo.max_v_samp_factor || // Y' must not be subsampled.
73 dinfo.comp_info[1].h_samp_factor != dinfo.comp_info[2].h_samp_factor ||
74 dinfo.comp_info[1].v_samp_factor != dinfo.comp_info[2].v_samp_factor || // Cb and Cr must be identically subsampled.
75 (dinfo.max_h_samp_factor % dinfo.comp_info[1].h_samp_factor) != 0 ||
76 (dinfo.max_v_samp_factor % dinfo.comp_info[1].v_samp_factor) != 0) { // No 2:3 subsampling or other weirdness.
77 fprintf(stderr, "Unsupported subsampling scheme. (Y=%dx%d, Cb=%dx%d, Cr=%dx%d)\n",
78 dinfo.comp_info[0].h_samp_factor, dinfo.comp_info[0].v_samp_factor,
79 dinfo.comp_info[1].h_samp_factor, dinfo.comp_info[1].v_samp_factor,
80 dinfo.comp_info[2].h_samp_factor, dinfo.comp_info[2].v_samp_factor);
83 dinfo.raw_data_out = true;
85 jpeg_start_decompress(&dinfo);
87 frame->width = dinfo.output_width;
88 frame->height = dinfo.output_height;
89 frame->chroma_subsampling_x = dinfo.max_h_samp_factor / dinfo.comp_info[1].h_samp_factor;
90 frame->chroma_subsampling_y = dinfo.max_v_samp_factor / dinfo.comp_info[1].v_samp_factor;
92 unsigned h_mcu_size = DCTSIZE * dinfo.max_h_samp_factor;
93 unsigned v_mcu_size = DCTSIZE * dinfo.max_v_samp_factor;
94 unsigned mcu_width_blocks = (dinfo.output_width + h_mcu_size - 1) / h_mcu_size;
95 unsigned mcu_height_blocks = (dinfo.output_height + v_mcu_size - 1) / v_mcu_size;
97 unsigned luma_width_blocks = mcu_width_blocks * dinfo.comp_info[0].h_samp_factor;
98 unsigned chroma_width_blocks = mcu_width_blocks * dinfo.comp_info[1].h_samp_factor;
99 unsigned luma_height_blocks = mcu_height_blocks * dinfo.comp_info[0].v_samp_factor;
100 unsigned chroma_height_blocks = mcu_height_blocks * dinfo.comp_info[1].v_samp_factor;
102 // TODO: Decode into a PBO.
103 frame->y.reset(new uint8_t[luma_width_blocks * luma_height_blocks * DCTSIZE2]);
104 frame->cb.reset(new uint8_t[chroma_width_blocks * chroma_height_blocks * DCTSIZE2]);
105 frame->cr.reset(new uint8_t[chroma_width_blocks * chroma_height_blocks * DCTSIZE2]);
106 frame->pitch_y = luma_width_blocks * DCTSIZE;
107 frame->pitch_chroma = chroma_width_blocks * DCTSIZE;
109 JSAMPROW yptr[v_mcu_size], cbptr[v_mcu_size], crptr[v_mcu_size];
110 JSAMPARRAY data[3] = { yptr, cbptr, crptr };
111 for (unsigned y = 0; y < mcu_height_blocks; ++y) {
112 // NOTE: The last elements of cbptr/crptr will be unused for vertically subsampled chroma.
113 for (unsigned yy = 0; yy < v_mcu_size; ++yy) {
114 yptr[yy] = frame->y.get() + (y * DCTSIZE * dinfo.max_v_samp_factor + yy) * frame->pitch_y;
115 cbptr[yy] = frame->cb.get() + (y * DCTSIZE * dinfo.comp_info[1].v_samp_factor + yy) * frame->pitch_chroma;
116 crptr[yy] = frame->cr.get() + (y * DCTSIZE * dinfo.comp_info[1].v_samp_factor + yy) * frame->pitch_chroma;
119 jpeg_read_raw_data(&dinfo, data, v_mcu_size);
122 (void) jpeg_finish_decompress(&dinfo);
123 jpeg_destroy_decompress(&dinfo);
131 // Assumes cache_mu is held.
132 vector<size_t> lru_timestamps;
133 for (const auto &key_and_value : cache) {
134 lru_timestamps.push_back(key_and_value.second.last_used);
137 size_t cutoff_point = CACHE_SIZE / 10; // Prune away the 10% oldest ones.
138 nth_element(lru_timestamps.begin(), lru_timestamps.begin() + cutoff_point, lru_timestamps.end());
139 size_t must_be_used_after = lru_timestamps[cutoff_point];
140 for (auto it = cache.begin(); it != cache.end(); ) {
141 if (it->second.last_used < must_be_used_after) {
142 it = cache.erase(it);
149 void jpeg_decoder_thread()
151 size_t num_decoded = 0, num_dropped = 0;
153 pthread_setname_np(pthread_self(), "JPEGDecoder");
157 shared_ptr<Frame> frame;
159 unique_lock<mutex> lock(cache_mu);
160 any_pending_decodes.wait(lock, [] {
161 return !pending_decodes.empty();
163 id = pending_decodes.front().first;
164 dest = pending_decodes.front().second;
165 pending_decodes.pop_front();
167 auto it = cache.find(id);
168 if (it != cache.end()) {
169 frame = it->second.frame;
170 it->second.last_used = event_counter++;
174 if (frame == nullptr) {
175 // Not found in the cache, so we need to do a decode or drop the request.
176 // Prune the queue if there are too many pending for this destination.
177 // TODO: Could we get starvation here?
178 size_t num_pending = 0;
179 for (const pair<JPEGID, JPEGFrameView *> &decode : pending_decodes) {
180 if (decode.second == dest) {
184 if (num_pending > 3) {
189 frame = decode_jpeg(filename_for_frame(id.stream_idx, id.pts));
191 unique_lock<mutex> lock(cache_mu);
192 cache[id] = LRUFrame{ frame, event_counter++ };
194 if (cache.size() > CACHE_SIZE) {
198 if (num_decoded % 1000 == 0) {
199 fprintf(stderr, "Decoded %zu images, dropped %zu (%.2f%% dropped)\n",
200 num_decoded, num_dropped, (100.0 * num_dropped) / (num_decoded + num_dropped));
204 dest->setDecodedFrame(frame);
208 JPEGFrameView::JPEGFrameView(QWidget *parent)
209 : QGLWidget(parent, global_share_widget) {
212 void JPEGFrameView::update_frame()
214 unique_lock<mutex> lock(cache_mu);
215 pending_decodes.emplace_back(JPEGID{ stream_idx, pts }, this);
216 any_pending_decodes.notify_all();
219 ResourcePool *resource_pool = nullptr;
221 void JPEGFrameView::initializeGL()
224 glDisable(GL_DEPTH_TEST);
227 static once_flag once;
229 resource_pool = new ResourcePool;
230 std::thread(&jpeg_decoder_thread).detach();
233 chain.reset(new EffectChain(1280, 720, resource_pool));
234 ImageFormat image_format;
235 image_format.color_space = COLORSPACE_sRGB;
236 image_format.gamma_curve = GAMMA_sRGB;
237 ycbcr_format.luma_coefficients = YCBCR_REC_709;
238 ycbcr_format.full_range = false;
239 ycbcr_format.num_levels = 256;
240 ycbcr_format.chroma_subsampling_x = 2;
241 ycbcr_format.chroma_subsampling_y = 1;
242 ycbcr_format.cb_x_position = 0.0f; // H.264 -- _not_ JPEG, even though our input is MJPEG-encoded
243 ycbcr_format.cb_y_position = 0.5f; // Irrelevant.
244 ycbcr_format.cr_x_position = 0.0f;
245 ycbcr_format.cr_y_position = 0.5f;
246 ycbcr_input = (movit::YCbCrInput *)chain->add_input(new YCbCrInput(image_format, ycbcr_format, 1280, 720));
248 ImageFormat inout_format;
249 inout_format.color_space = COLORSPACE_sRGB;
250 inout_format.gamma_curve = GAMMA_sRGB;
253 chain->add_output(inout_format, OUTPUT_ALPHA_FORMAT_POSTMULTIPLIED);
255 chain->set_dither_bits(8);
261 void JPEGFrameView::resizeGL(int width, int height)
264 glViewport(0, 0, width, height);
268 void JPEGFrameView::paintGL()
270 if (current_frame == nullptr) {
271 glClearColor(0.0f, 0.0f, 0.0f, 1.0f);
272 glClear(GL_COLOR_BUFFER_BIT);
277 chain->render_to_screen();
280 void JPEGFrameView::setDecodedFrame(std::shared_ptr<Frame> frame)
282 post_to_main_thread([this, frame] {
283 current_frame = frame;
284 ycbcr_format.chroma_subsampling_x = frame->chroma_subsampling_x;
285 ycbcr_format.chroma_subsampling_y = frame->chroma_subsampling_y;
286 ycbcr_input->change_ycbcr_format(ycbcr_format);
287 ycbcr_input->set_width(frame->width);
288 ycbcr_input->set_height(frame->height);
289 ycbcr_input->set_pixel_data(0, frame->y.get());
290 ycbcr_input->set_pixel_data(1, frame->cb.get());
291 ycbcr_input->set_pixel_data(2, frame->cr.get());
292 ycbcr_input->set_pitch(0, frame->pitch_y);
293 ycbcr_input->set_pitch(1, frame->pitch_chroma);
294 ycbcr_input->set_pitch(2, frame->pitch_chroma);