git.sesse.net Git - nageru/blob - futatabi/export.cpp

   1 #include "clip_list.h"
   2 #include "defs.h"
   3 #include "export.h"
   4 #include "flags.h"
   5 #include "frame_on_disk.h"
   6 #include "player.h"
   7 #include "shared/ffmpeg_raii.h"
   8 #include "shared/timebase.h"
   9
  10 #include <QMessageBox>
  11 #include <QProgressDialog>
  12
  13 #include <future>
  14 #include <vector>
  15
  16 #include <unistd.h>
  17
  18 extern "C" {
  19 #include <libavformat/avformat.h>
  20 }
  21
  22 using namespace std;
  23
  24 namespace {
  25
  26 // Only used in export_cliplist_clip_multitrack_triggered.
  27 struct BufferedJPEG {
  28         int64_t pts;
  29         unsigned stream_idx;
  30         string jpeg;
  31 };
  32
  33 bool write_buffered_jpegs(AVFormatContext *avctx, const vector<BufferedJPEG> &buffered_jpegs)
  34 {
  35         for (const BufferedJPEG &jpeg : buffered_jpegs) {
  36                 AVPacket pkt;
  37                 av_init_packet(&pkt);
  38                 pkt.stream_index = jpeg.stream_idx;
  39                 pkt.data = (uint8_t *)jpeg.jpeg.data();
  40                 pkt.size = jpeg.jpeg.size();
  41                 pkt.pts = jpeg.pts;
  42                 pkt.dts = jpeg.pts;
  43                 pkt.flags = AV_PKT_FLAG_KEY;
  44
  45                 if (av_write_frame(avctx, &pkt) < 0) {
  46                         return false;
  47                 }
  48         }
  49         return true;
  50 }
  51
  52 }  // namespace
  53
  54 void export_multitrack_clip(const string &filename, const Clip &clip)
  55 {
  56         AVFormatContext *avctx = nullptr;
  57         avformat_alloc_output_context2(&avctx, NULL, NULL, filename.c_str());
  58         if (avctx == nullptr) {
  59                 QMessageBox msgbox;
  60                 msgbox.setText("Could not allocate FFmpeg context");
  61                 msgbox.exec();
  62                 return;
  63         }
  64         AVFormatContextWithCloser closer(avctx);
  65
  66         int ret = avio_open(&avctx->pb, filename.c_str(), AVIO_FLAG_WRITE);
  67         if (ret < 0) {
  68                 QMessageBox msgbox;
  69                 msgbox.setText(QString::fromStdString("Could not open output file '" + filename + "'"));
  70                 msgbox.exec();
  71                 return;
  72         }
  73
  74         // Find the first frame for each stream.
  75         size_t num_frames = 0;
  76         size_t num_streams_with_frames_left = 0;
  77         size_t last_stream_idx = 0;
  78         FrameReader readers[MAX_STREAMS];
  79         bool has_frames[MAX_STREAMS];
  80         size_t first_frame_idx[MAX_STREAMS], last_frame_idx[MAX_STREAMS];  // Inclusive, exclusive.
  81         {
  82                 lock_guard<mutex> lock(frame_mu);
  83                 for (size_t stream_idx = 0; stream_idx < MAX_STREAMS; ++stream_idx) {
  84                         // Find the first frame such that frame.pts <= pts_in.
  85                         auto it = find_first_frame_at_or_after(frames[stream_idx], clip.pts_in);
  86                         first_frame_idx[stream_idx] = distance(frames[stream_idx].begin(), it);
  87                         has_frames[stream_idx] = (it != frames[stream_idx].end());
  88
  89                         // Find the first frame such that frame.pts >= pts_out.
  90                         it = find_first_frame_at_or_after(frames[stream_idx], clip.pts_out);
  91                         last_frame_idx[stream_idx] = distance(frames[stream_idx].begin(), it);
  92                         num_frames += last_frame_idx[stream_idx] - first_frame_idx[stream_idx];
  93
  94                         if (has_frames[stream_idx]) {
  95                                 ++num_streams_with_frames_left;
  96                                 last_stream_idx = stream_idx;
  97                         }
  98                 }
  99         }
 100
 101         // Create the streams. Note that some of them could be without frames
 102         // (we try to maintain the stream indexes in the export).
 103         vector<AVStream *> video_streams;
 104         for (unsigned stream_idx = 0; stream_idx <= last_stream_idx; ++stream_idx) {
 105                 AVStream *avstream_video = avformat_new_stream(avctx, nullptr);
 106                 if (avstream_video == nullptr) {
 107                         fprintf(stderr, "avformat_new_stream() failed\n");
 108                         exit(1);
 109                 }
 110                 avstream_video->time_base = AVRational{1, TIMEBASE};
 111                 avstream_video->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
 112                 avstream_video->codecpar->codec_id = AV_CODEC_ID_MJPEG;
 113                 avstream_video->codecpar->width = global_flags.width;  // Might be wrong, but doesn't matter all that much.
 114                 avstream_video->codecpar->height = global_flags.height;
 115
 116                 // TODO: Deduplicate this against Mux.
 117                 avstream_video->codecpar->color_primaries = AVCOL_PRI_BT709;  // RGB colorspace (inout_format.color_space).
 118                 avstream_video->codecpar->color_trc = AVCOL_TRC_IEC61966_2_1;  // Gamma curve (inout_format.gamma_curve).
 119                 // YUV colorspace (output_ycbcr_format.luma_coefficients).
 120                 avstream_video->codecpar->color_space = AVCOL_SPC_BT709;
 121                 avstream_video->codecpar->color_range = AVCOL_RANGE_MPEG;  // Full vs. limited range (output_ycbcr_format.full_range).
 122                 avstream_video->codecpar->chroma_location = AVCHROMA_LOC_LEFT;  // Chroma sample location. See chroma_offset_0[] in Mixer::subsample_chroma().
 123                 avstream_video->codecpar->field_order = AV_FIELD_PROGRESSIVE;
 124                 video_streams.push_back(avstream_video);
 125         }
 126
 127         if (avformat_write_header(avctx, nullptr) < 0) {
 128                 QMessageBox msgbox;
 129                 msgbox.setText("Writing header failed");
 130                 msgbox.exec();
 131                 unlink(filename.c_str());
 132                 return;
 133         }
 134
 135         QProgressDialog progress(QString::fromStdString("Exporting to " + filename + "..."), "Abort", 0, 1);
 136         progress.setWindowTitle("Futatabi");
 137         progress.setWindowModality(Qt::WindowModal);
 138         progress.setMinimumDuration(1000);
 139         progress.setMaximum(num_frames);
 140         progress.setValue(0);
 141
 142         // We buffer up to 1000 frames at a time, in a hope that we can reduce
 143         // the amount of seeking needed on rotational media.
 144         vector<BufferedJPEG> buffered_jpegs;
 145         size_t frames_written = 0;
 146         while (num_streams_with_frames_left > 0) {
 147                 // Find the stream with the lowest frame. Lower stream indexes win.
 148                 FrameOnDisk first_frame;
 149                 unsigned first_frame_stream_idx = 0;
 150                 {
 151                         lock_guard<mutex> lock(frame_mu);
 152                         for (size_t stream_idx = 0; stream_idx < MAX_STREAMS; ++stream_idx) {
 153                                 if (!has_frames[stream_idx]) {
 154                                         continue;
 155                                 }
 156                                 if (first_frame.pts == -1 || frames[stream_idx][first_frame_idx[stream_idx]].pts < first_frame.pts) {
 157                                         first_frame = frames[stream_idx][first_frame_idx[stream_idx]];
 158                                         first_frame_stream_idx = stream_idx;
 159                                 }
 160                         }
 161                         ++first_frame_idx[first_frame_stream_idx];
 162                         if (first_frame_idx[first_frame_stream_idx] >= last_frame_idx[first_frame_stream_idx]) {
 163                                 has_frames[first_frame_stream_idx] = false;
 164                                 --num_streams_with_frames_left;
 165                         }
 166                 }
 167                 string jpeg = readers[first_frame_stream_idx].read_frame(first_frame);
 168                 int64_t scaled_pts = av_rescale_q(first_frame.pts, AVRational{1, TIMEBASE},
 169                         video_streams[first_frame_stream_idx]->time_base);
 170                 buffered_jpegs.emplace_back(BufferedJPEG{ scaled_pts, first_frame_stream_idx, std::move(jpeg) });
 171                 if (buffered_jpegs.size() >= 1000) {
 172                         if (!write_buffered_jpegs(avctx, buffered_jpegs)) {
 173                                 QMessageBox msgbox;
 174                                 msgbox.setText("Writing frames failed");
 175                                 msgbox.exec();
 176                                 unlink(filename.c_str());
 177                                 return;
 178                         }
 179                         frames_written += buffered_jpegs.size();
 180                         progress.setValue(frames_written);
 181                         buffered_jpegs.clear();
 182                 }
 183                 if (progress.wasCanceled()) {
 184                         unlink(filename.c_str());
 185                         return;
 186                 }
 187         }
 188
 189         if (!write_buffered_jpegs(avctx, buffered_jpegs)) {
 190                 QMessageBox msgbox;
 191                 msgbox.setText("Writing frames failed");
 192                 msgbox.exec();
 193                 unlink(filename.c_str());
 194                 return;
 195         }
 196         frames_written += buffered_jpegs.size();
 197         progress.setValue(frames_written);
 198 }
 199
 200 void export_interpolated_clip(const string &filename, const Clip &clip)
 201 {
 202         AVFormatContext *avctx = nullptr;
 203         avformat_alloc_output_context2(&avctx, NULL, NULL, filename.c_str());
 204         if (avctx == nullptr) {
 205                 QMessageBox msgbox;
 206                 msgbox.setText("Could not allocate FFmpeg context");
 207                 msgbox.exec();
 208                 return;
 209         }
 210         AVFormatContextWithCloser closer(avctx);
 211
 212         int ret = avio_open(&avctx->pb, filename.c_str(), AVIO_FLAG_WRITE);
 213         if (ret < 0) {
 214                 QMessageBox msgbox;
 215                 msgbox.setText(QString::fromStdString("Could not open output file '" + filename + "'"));
 216                 msgbox.exec();
 217                 return;
 218         }
 219
 220         QProgressDialog progress(QString::fromStdString("Exporting to " + filename + "..."), "Abort", 0, 1);
 221         progress.setWindowTitle("Futatabi");
 222         progress.setWindowModality(Qt::WindowModal);
 223         progress.setMinimumDuration(1000);
 224         progress.setMaximum(100000);
 225         progress.setValue(0);
 226
 227         promise<void> done_promise;
 228         future<void> done = done_promise.get_future();
 229         std::atomic<double> current_value{0.0};
 230
 231         unique_ptr<Player> player(new Player(/*destination=*/nullptr, Player::FILE_STREAM_OUTPUT, closer.release()));
 232         player->set_done_callback([&done_promise] {
 233                 done_promise.set_value();
 234         });
 235         player->set_progress_callback([&current_value] (const std::map<size_t, double> &player_progress) {
 236                 assert(player_progress.size() == 1);
 237                 current_value = player_progress.begin()->second;
 238         });
 239         player->play_clip(clip, /*clip_idx=*/0, clip.stream_idx);
 240         while (done.wait_for(std::chrono::milliseconds(100)) != future_status::ready && !progress.wasCanceled()) {
 241                 progress.setValue(lrint(100000.0 * current_value));
 242         }
 243         if (progress.wasCanceled()) {
 244                 unlink(filename.c_str());
 245                 player.reset();
 246                 return;
 247         }
 248 }