13 #include <libavformat/avformat.h>
16 #include <QApplication>
18 #include "mainwindow.h"
19 #include "ffmpeg_raii.h"
20 #include "post_to_main_thread.h"
21 #include "ui_mainwindow.h"
23 #define MAX_STREAMS 16
26 using namespace std::chrono;
28 string filename_for_frame(unsigned stream_idx, int64_t pts)
31 snprintf(filename, sizeof(filename), "frames/cam%d-pts%09ld.jpeg", stream_idx, pts);
36 vector<int64_t> frames[MAX_STREAMS];
40 int main(int argc, char **argv)
43 avformat_network_init();
45 QApplication app(argc, argv);
46 MainWindow mainWindow;
49 thread(thread_func).detach();
56 auto format_ctx = avformat_open_input_unique("multiangle.mp4", nullptr, nullptr);
57 if (format_ctx == nullptr) {
58 fprintf(stderr, "%s: Error opening file\n", "example.mp4");
62 int64_t last_pts = -1;
66 unique_ptr<AVPacket, decltype(av_packet_unref)*> pkt_cleanup(
67 &pkt, av_packet_unref);
71 if (av_read_frame(format_ctx.get(), &pkt) != 0) {
74 fprintf(stderr, "Got a frame from camera %d, pts = %ld, size = %d\n",
75 pkt.stream_index, pkt.pts, pkt.size);
76 string filename = filename_for_frame(pkt.stream_index, pkt.pts);
77 FILE *fp = fopen(filename.c_str(), "wb");
79 perror(filename.c_str());
82 fwrite(pkt.data, pkt.size, 1, fp);
85 post_to_main_thread([pkt] {
86 if (pkt.stream_index == 0) {
87 global_mainwindow->ui->input1_display->setFrame(pkt.stream_index, pkt.pts);
88 } else if (pkt.stream_index == 1) {
89 global_mainwindow->ui->input2_display->setFrame(pkt.stream_index, pkt.pts);
90 } else if (pkt.stream_index == 2) {
91 global_mainwindow->ui->input3_display->setFrame(pkt.stream_index, pkt.pts);
95 assert(pkt.stream_index < MAX_STREAMS);
96 frames[pkt.stream_index].push_back(pkt.pts);
98 // Hack. Assumes a given timebase.
100 this_thread::sleep_for(microseconds((pkt.pts - last_pts) * 1000000 / 12800));