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

   1 #include "export.h"
   2
   3 #include "clip_list.h"
   4 #include "defs.h"
   5 #include "flags.h"
   6 #include "frame_on_disk.h"
   7 #include "player.h"
   8 #include "shared/ffmpeg_raii.h"
   9 #include "shared/shared_defs.h"
  10 #include "shared/timebase.h"
  11
  12 #include <QMessageBox>
  13 #include <QProgressDialog>
  14 #include <future>
  15 #include <unistd.h>
  16 #include <vector>
  17
  18 extern "C" {
  19 #include <libavformat/avformat.h>
  20 #include <libavutil/channel_layout.h>
  21 }
  22
  23 using namespace std;
  24
  25 namespace {
  26
  27 // Only used in export_cliplist_clip_multitrack_triggered.
  28 struct BufferedFrame {
  29         int64_t pts;
  30         unsigned video_stream_idx;
  31         string data;
  32 };
  33
  34 bool write_buffered_frames(AVFormatContext *avctx, const vector<BufferedFrame> &buffered_frames)
  35 {
  36         for (const BufferedFrame &frame : buffered_frames) {
  37                 AVPacket pkt;
  38                 av_init_packet(&pkt);
  39                 pkt.stream_index = frame.video_stream_idx;
  40                 pkt.data = (uint8_t *)frame.data.data();
  41                 pkt.size = frame.data.size();
  42                 pkt.pts = frame.pts;
  43                 pkt.dts = frame.pts;
  44                 pkt.flags = AV_PKT_FLAG_KEY;
  45
  46                 if (av_write_frame(avctx, &pkt) < 0) {
  47                         return false;
  48                 }
  49         }
  50         return true;
  51 }
  52
  53 }  // namespace
  54
  55 void export_multitrack_clip(const string &filename, const Clip &clip)
  56 {
  57         AVFormatContext *avctx = nullptr;
  58         avformat_alloc_output_context2(&avctx, NULL, NULL, filename.c_str());
  59         if (avctx == nullptr) {
  60                 QMessageBox msgbox;
  61                 msgbox.setText("Could not allocate FFmpeg context");
  62                 msgbox.exec();
  63                 return;
  64         }
  65         AVFormatContextWithCloser closer(avctx);
  66
  67         int ret = avio_open(&avctx->pb, filename.c_str(), AVIO_FLAG_WRITE);
  68         if (ret < 0) {
  69                 QMessageBox msgbox;
  70                 msgbox.setText(QString::fromStdString("Could not open output file '" + filename + "'"));
  71                 msgbox.exec();
  72                 return;
  73         }
  74
  75         // Find the first frame for each stream.
  76         size_t num_frames = 0;
  77         size_t num_streams_with_frames_left = 0;
  78         size_t last_stream_idx = 0;
  79         FrameReader readers[MAX_STREAMS];
  80         bool has_frames[MAX_STREAMS];
  81         size_t first_frame_idx[MAX_STREAMS], last_frame_idx[MAX_STREAMS];  // Inclusive, exclusive.
  82         {
  83                 lock_guard<mutex> lock(frame_mu);
  84                 for (size_t stream_idx = 0; stream_idx < MAX_STREAMS; ++stream_idx) {
  85                         // Find the first frame such that frame.pts <= pts_in.
  86                         auto it = find_first_frame_at_or_after(frames[stream_idx], clip.pts_in);
  87                         first_frame_idx[stream_idx] = distance(frames[stream_idx].begin(), it);
  88                         has_frames[stream_idx] = (it != frames[stream_idx].end());
  89
  90                         // Find the first frame such that frame.pts >= pts_out.
  91                         it = find_first_frame_at_or_after(frames[stream_idx], clip.pts_out);
  92                         last_frame_idx[stream_idx] = distance(frames[stream_idx].begin(), it);
  93                         num_frames += last_frame_idx[stream_idx] - first_frame_idx[stream_idx];
  94
  95                         if (has_frames[stream_idx]) {
  96                                 ++num_streams_with_frames_left;
  97                                 last_stream_idx = stream_idx;
  98                         }
  99                 }
 100         }
 101
 102         // Create the streams. Note that some of them could be without frames
 103         // (we try to maintain the stream indexes in the export).
 104         vector<AVStream *> video_streams;
 105         for (unsigned stream_idx = 0; stream_idx <= last_stream_idx; ++stream_idx) {
 106                 AVStream *avstream_video = avformat_new_stream(avctx, nullptr);
 107                 if (avstream_video == nullptr) {
 108                         fprintf(stderr, "avformat_new_stream() failed\n");
 109                         abort();
 110                 }
 111                 avstream_video->time_base = AVRational{ 1, TIMEBASE };
 112                 avstream_video->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
 113                 avstream_video->codecpar->codec_id = AV_CODEC_ID_MJPEG;
 114                 avstream_video->codecpar->width = global_flags.width;  // Might be wrong, but doesn't matter all that much.
 115                 avstream_video->codecpar->height = global_flags.height;
 116
 117                 // TODO: Deduplicate this against Mux.
 118                 avstream_video->codecpar->color_primaries = AVCOL_PRI_BT709;  // RGB colorspace (inout_format.color_space).
 119                 avstream_video->codecpar->color_trc = AVCOL_TRC_IEC61966_2_1;  // Gamma curve (inout_format.gamma_curve).
 120                 // YUV colorspace (output_ycbcr_format.luma_coefficients).
 121                 avstream_video->codecpar->color_space = AVCOL_SPC_BT709;
 122                 avstream_video->codecpar->color_range = AVCOL_RANGE_MPEG;  // Full vs. limited range (output_ycbcr_format.full_range).
 123                 avstream_video->codecpar->chroma_location = AVCHROMA_LOC_LEFT;  // Chroma sample location. See chroma_offset_0[] in Mixer::subsample_chroma().
 124                 avstream_video->codecpar->field_order = AV_FIELD_PROGRESSIVE;
 125                 video_streams.push_back(avstream_video);
 126         }
 127
 128         // Similar, for audio streams.
 129         vector<AVStream *> audio_streams;
 130         for (unsigned stream_idx = 0; stream_idx <= last_stream_idx; ++stream_idx) {
 131                 AVStream *avstream_audio = avformat_new_stream(avctx, nullptr);
 132                 if (avstream_audio == nullptr) {
 133                         fprintf(stderr, "avformat_new_stream() failed\n");
 134                         abort();
 135                 }
 136                 avstream_audio->time_base = AVRational{ 1, TIMEBASE };
 137                 avstream_audio->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
 138                 avstream_audio->codecpar->codec_id = AV_CODEC_ID_PCM_S32LE;
 139                 avstream_audio->codecpar->channel_layout = AV_CH_LAYOUT_STEREO;
 140                 avstream_audio->codecpar->channels = 2;
 141                 avstream_audio->codecpar->sample_rate = OUTPUT_FREQUENCY;
 142                 audio_streams.push_back(avstream_audio);
 143         }
 144
 145         if (avformat_write_header(avctx, nullptr) < 0) {
 146                 QMessageBox msgbox;
 147                 msgbox.setText("Writing header failed");
 148                 msgbox.exec();
 149                 unlink(filename.c_str());
 150                 return;
 151         }
 152
 153         QProgressDialog progress(QString::fromStdString("Exporting to " + filename + "..."), "Abort", 0, 1);
 154         progress.setWindowTitle("Futatabi");
 155         progress.setWindowModality(Qt::WindowModal);
 156         progress.setMinimumDuration(1000);
 157         progress.setMaximum(num_frames);
 158         progress.setValue(0);
 159
 160         // We buffer up to 1000 frames at a time, in a hope that we can reduce
 161         // the amount of seeking needed on rotational media.
 162         vector<BufferedFrame> buffered_frames;
 163         size_t frames_written = 0;
 164         while (num_streams_with_frames_left > 0) {
 165                 // Find the stream with the lowest frame. Lower stream indexes win.
 166                 FrameOnDisk first_frame;
 167                 unsigned first_frame_stream_idx = 0;
 168                 {
 169                         lock_guard<mutex> lock(frame_mu);
 170                         for (size_t stream_idx = 0; stream_idx < MAX_STREAMS; ++stream_idx) {
 171                                 if (!has_frames[stream_idx]) {
 172                                         continue;
 173                                 }
 174                                 if (first_frame.pts == -1 || frames[stream_idx][first_frame_idx[stream_idx]].pts < first_frame.pts) {
 175                                         first_frame = frames[stream_idx][first_frame_idx[stream_idx]];
 176                                         first_frame_stream_idx = stream_idx;
 177                                 }
 178                         }
 179                         ++first_frame_idx[first_frame_stream_idx];
 180                         if (first_frame_idx[first_frame_stream_idx] >= last_frame_idx[first_frame_stream_idx]) {
 181                                 has_frames[first_frame_stream_idx] = false;
 182                                 --num_streams_with_frames_left;
 183                         }
 184                 }
 185
 186                 FrameReader::Frame frame = readers[first_frame_stream_idx].read_frame(first_frame, /*read_video=*/true, /*read_audio=*/true);
 187
 188                 // Write audio. (Before video, since that's what we expect on input.)
 189                 if (!frame.audio.empty()) {
 190                         unsigned audio_stream_idx = first_frame_stream_idx + video_streams.size();
 191                         int64_t scaled_audio_pts = av_rescale_q(first_frame.pts, AVRational{ 1, TIMEBASE },
 192                                                                 audio_streams[first_frame_stream_idx]->time_base);
 193                         buffered_frames.emplace_back(BufferedFrame{ scaled_audio_pts, audio_stream_idx, std::move(frame.audio) });
 194                 }
 195
 196                 // Write video.
 197                 unsigned video_stream_idx = first_frame_stream_idx;
 198                 int64_t scaled_video_pts = av_rescale_q(first_frame.pts, AVRational{ 1, TIMEBASE },
 199                                                         video_streams[first_frame_stream_idx]->time_base);
 200                 buffered_frames.emplace_back(BufferedFrame{ scaled_video_pts, video_stream_idx, std::move(frame.video) });
 201
 202                 // Flush to disk if required.
 203                 if (buffered_frames.size() >= 1000) {
 204                         if (!write_buffered_frames(avctx, buffered_frames)) {
 205                                 QMessageBox msgbox;
 206                                 msgbox.setText("Writing frames failed");
 207                                 msgbox.exec();
 208                                 unlink(filename.c_str());
 209                                 return;
 210                         }
 211                         frames_written += buffered_frames.size();
 212                         progress.setValue(frames_written);
 213                         buffered_frames.clear();
 214                 }
 215                 if (progress.wasCanceled()) {
 216                         unlink(filename.c_str());
 217                         return;
 218                 }
 219         }
 220
 221         if (!write_buffered_frames(avctx, buffered_frames)) {
 222                 QMessageBox msgbox;
 223                 msgbox.setText("Writing frames failed");
 224                 msgbox.exec();
 225                 unlink(filename.c_str());
 226                 return;
 227         }
 228         frames_written += buffered_frames.size();
 229         progress.setValue(frames_written);
 230 }
 231
 232 void export_interpolated_clip(const string &filename, const vector<Clip> &clips)
 233 {
 234         AVFormatContext *avctx = nullptr;
 235         avformat_alloc_output_context2(&avctx, NULL, NULL, filename.c_str());
 236         if (avctx == nullptr) {
 237                 QMessageBox msgbox;
 238                 msgbox.setText("Could not allocate FFmpeg context");
 239                 msgbox.exec();
 240                 return;
 241         }
 242         AVFormatContextWithCloser closer(avctx);
 243
 244         int ret = avio_open(&avctx->pb, filename.c_str(), AVIO_FLAG_WRITE);
 245         if (ret < 0) {
 246                 QMessageBox msgbox;
 247                 msgbox.setText(QString::fromStdString("Could not open output file '" + filename + "'"));
 248                 msgbox.exec();
 249                 return;
 250         }
 251
 252         QProgressDialog progress(QString::fromStdString("Exporting to " + filename + "..."), "Abort", 0, 1);
 253         progress.setWindowTitle("Futatabi");
 254         progress.setWindowModality(Qt::WindowModal);
 255         progress.setMinimumDuration(1000);
 256         progress.setMaximum(100000);
 257         progress.setValue(0);
 258
 259         vector<ClipWithID> clips_with_id;
 260         for (const Clip &clip : clips) {
 261                 clips_with_id.emplace_back(ClipWithID{ clip, 0 });
 262         }
 263         TimeRemaining total_length = compute_total_time(clips_with_id);
 264
 265         promise<void> done_promise;
 266         future<void> done = done_promise.get_future();
 267         std::atomic<double> current_value{ 0.0 };
 268
 269         Player player(/*destination=*/nullptr, Player::FILE_STREAM_OUTPUT, closer.release());
 270         player.set_done_callback([&done_promise] {
 271                 done_promise.set_value();
 272         });
 273         player.set_progress_callback([&current_value, total_length](const std::map<uint64_t, double> &player_progress, TimeRemaining time_remaining) {
 274                 current_value = 1.0 - time_remaining.t / total_length.t;  // Nothing to do about the infinite clips.
 275         });
 276         player.play(clips_with_id);
 277         while (done.wait_for(std::chrono::milliseconds(100)) != future_status::ready && !progress.wasCanceled()) {
 278                 progress.setValue(lrint(100000.0 * current_value));
 279         }
 280         if (progress.wasCanceled()) {
 281                 unlink(filename.c_str());
 282                 // Destroying player on scope exit will abort the render job.
 283         }
 284 }