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 }
  21
  22 using namespace std;
  23
  24 namespace {
  25
  26 // Only used in export_cliplist_clip_multitrack_triggered.
  27 struct BufferedFrame {
  28         int64_t pts;
  29         unsigned video_stream_idx;
  30         string data;
  31 };
  32
  33 bool write_buffered_frames(AVFormatContext *avctx, const vector<BufferedFrame> &buffered_frames)
  34 {
  35         for (const BufferedFrame &frame : buffered_frames) {
  36                 AVPacket pkt;
  37                 av_init_packet(&pkt);
  38                 pkt.stream_index = frame.video_stream_idx;
  39                 pkt.data = (uint8_t *)frame.data.data();
  40                 pkt.size = frame.data.size();
  41                 pkt.pts = frame.pts;
  42                 pkt.dts = frame.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                         abort();
 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         // Similar, for audio streams.
 128         vector<AVStream *> audio_streams;
 129         for (unsigned stream_idx = 0; stream_idx <= last_stream_idx; ++stream_idx) {
 130                 AVStream *avstream_audio = avformat_new_stream(avctx, nullptr);
 131                 if (avstream_audio == nullptr) {
 132                         fprintf(stderr, "avformat_new_stream() failed\n");
 133                         abort();
 134                 }
 135                 avstream_audio->time_base = AVRational{ 1, TIMEBASE };
 136                 avstream_audio->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
 137                 avstream_audio->codecpar->codec_id = AV_CODEC_ID_PCM_S32LE;
 138                 avstream_audio->codecpar->channel_layout = AV_CH_LAYOUT_STEREO;
 139                 avstream_audio->codecpar->channels = 2;
 140                 avstream_audio->codecpar->sample_rate = OUTPUT_FREQUENCY;
 141                 audio_streams.push_back(avstream_audio);
 142         }
 143
 144         if (avformat_write_header(avctx, nullptr) < 0) {
 145                 QMessageBox msgbox;
 146                 msgbox.setText("Writing header failed");
 147                 msgbox.exec();
 148                 unlink(filename.c_str());
 149                 return;
 150         }
 151
 152         QProgressDialog progress(QString::fromStdString("Exporting to " + filename + "..."), "Abort", 0, 1);
 153         progress.setWindowTitle("Futatabi");
 154         progress.setWindowModality(Qt::WindowModal);
 155         progress.setMinimumDuration(1000);
 156         progress.setMaximum(num_frames);
 157         progress.setValue(0);
 158
 159         // We buffer up to 1000 frames at a time, in a hope that we can reduce
 160         // the amount of seeking needed on rotational media.
 161         vector<BufferedFrame> buffered_frames;
 162         size_t frames_written = 0;
 163         while (num_streams_with_frames_left > 0) {
 164                 // Find the stream with the lowest frame. Lower stream indexes win.
 165                 FrameOnDisk first_frame;
 166                 unsigned first_frame_stream_idx = 0;
 167                 {
 168                         lock_guard<mutex> lock(frame_mu);
 169                         for (size_t stream_idx = 0; stream_idx < MAX_STREAMS; ++stream_idx) {
 170                                 if (!has_frames[stream_idx]) {
 171                                         continue;
 172                                 }
 173                                 if (first_frame.pts == -1 || frames[stream_idx][first_frame_idx[stream_idx]].pts < first_frame.pts) {
 174                                         first_frame = frames[stream_idx][first_frame_idx[stream_idx]];
 175                                         first_frame_stream_idx = stream_idx;
 176                                 }
 177                         }
 178                         ++first_frame_idx[first_frame_stream_idx];
 179                         if (first_frame_idx[first_frame_stream_idx] >= last_frame_idx[first_frame_stream_idx]) {
 180                                 has_frames[first_frame_stream_idx] = false;
 181                                 --num_streams_with_frames_left;
 182                         }
 183                 }
 184
 185                 FrameReader::Frame frame = readers[first_frame_stream_idx].read_frame(first_frame, /*read_video=*/true, /*read_audio=*/true);
 186
 187                 // Write audio. (Before video, since that's what we expect on input.)
 188                 if (!frame.audio.empty()) {
 189                         unsigned audio_stream_idx = first_frame_stream_idx + video_streams.size();
 190                         int64_t scaled_audio_pts = av_rescale_q(first_frame.pts, AVRational{ 1, TIMEBASE },
 191                                                                 audio_streams[first_frame_stream_idx]->time_base);
 192                         buffered_frames.emplace_back(BufferedFrame{ scaled_audio_pts, audio_stream_idx, std::move(frame.audio) });
 193                 }
 194
 195                 // Write video.
 196                 unsigned video_stream_idx = first_frame_stream_idx;
 197                 int64_t scaled_video_pts = av_rescale_q(first_frame.pts, AVRational{ 1, TIMEBASE },
 198                                                         video_streams[first_frame_stream_idx]->time_base);
 199                 buffered_frames.emplace_back(BufferedFrame{ scaled_video_pts, video_stream_idx, std::move(frame.video) });
 200
 201                 // Flush to disk if required.
 202                 if (buffered_frames.size() >= 1000) {
 203                         if (!write_buffered_frames(avctx, buffered_frames)) {
 204                                 QMessageBox msgbox;
 205                                 msgbox.setText("Writing frames failed");
 206                                 msgbox.exec();
 207                                 unlink(filename.c_str());
 208                                 return;
 209                         }
 210                         frames_written += buffered_frames.size();
 211                         progress.setValue(frames_written);
 212                         buffered_frames.clear();
 213                 }
 214                 if (progress.wasCanceled()) {
 215                         unlink(filename.c_str());
 216                         return;
 217                 }
 218         }
 219
 220         if (!write_buffered_frames(avctx, buffered_frames)) {
 221                 QMessageBox msgbox;
 222                 msgbox.setText("Writing frames failed");
 223                 msgbox.exec();
 224                 unlink(filename.c_str());
 225                 return;
 226         }
 227         frames_written += buffered_frames.size();
 228         progress.setValue(frames_written);
 229 }
 230
 231 void export_interpolated_clip(const string &filename, const vector<Clip> &clips)
 232 {
 233         AVFormatContext *avctx = nullptr;
 234         avformat_alloc_output_context2(&avctx, NULL, NULL, filename.c_str());
 235         if (avctx == nullptr) {
 236                 QMessageBox msgbox;
 237                 msgbox.setText("Could not allocate FFmpeg context");
 238                 msgbox.exec();
 239                 return;
 240         }
 241         AVFormatContextWithCloser closer(avctx);
 242
 243         int ret = avio_open(&avctx->pb, filename.c_str(), AVIO_FLAG_WRITE);
 244         if (ret < 0) {
 245                 QMessageBox msgbox;
 246                 msgbox.setText(QString::fromStdString("Could not open output file '" + filename + "'"));
 247                 msgbox.exec();
 248                 return;
 249         }
 250
 251         QProgressDialog progress(QString::fromStdString("Exporting to " + filename + "..."), "Abort", 0, 1);
 252         progress.setWindowTitle("Futatabi");
 253         progress.setWindowModality(Qt::WindowModal);
 254         progress.setMinimumDuration(1000);
 255         progress.setMaximum(100000);
 256         progress.setValue(0);
 257
 258         vector<ClipWithID> clips_with_id;
 259         for (const Clip &clip : clips) {
 260                 clips_with_id.emplace_back(ClipWithID{ clip, 0 });
 261         }
 262         TimeRemaining total_length = compute_total_time(clips_with_id);
 263
 264         promise<void> done_promise;
 265         future<void> done = done_promise.get_future();
 266         std::atomic<double> current_value{ 0.0 };
 267
 268         Player player(/*destination=*/nullptr, Player::FILE_STREAM_OUTPUT, closer.release());
 269         player.set_done_callback([&done_promise] {
 270                 done_promise.set_value();
 271         });
 272         player.set_progress_callback([&current_value, total_length](const std::map<uint64_t, double> &player_progress, TimeRemaining time_remaining) {
 273                 current_value = 1.0 - time_remaining.t / total_length.t;  // Nothing to do about the infinite clips.
 274         });
 275         player.play(clips_with_id);
 276         while (done.wait_for(std::chrono::milliseconds(100)) != future_status::ready && !progress.wasCanceled()) {
 277                 progress.setValue(lrint(100000.0 * current_value));
 278         }
 279         if (progress.wasCanceled()) {
 280                 unlink(filename.c_str());
 281                 // Destroying player on scope exit will abort the render job.
 282         }
 283 }