- Frame frame;
- Eyes eyes = Eyes::BOTH;
- if (!_position) {
- /* This is the first data we have received since initialisation or seek. Set
- the position based on the frame that was given. After this first time
- we just cound frames, since (as with audio) it seems that ContentTimes
- are unreliable from FFmpegDecoder. They are much better than audio times
- but still we get the occasional one which is duplicated. In this case
- ffmpeg seems to carry on regardless, processing the video frame as normal.
- If we drop the frame with the duplicated timestamp we obviously lose sync.
- */
-
- if (vft == VideoFrameType::THREE_D_ALTERNATE) {
- frame = decoder_frame / 2;
- eyes = (decoder_frame % 1) ? Eyes::RIGHT : Eyes::LEFT;
- } else {
- frame = decoder_frame;
- if (vft == VideoFrameType::THREE_D) {
- auto j2k = dynamic_pointer_cast<const J2KImageProxy>(image);
- /* At the moment only DCP decoders producers VideoFrameType::THREE_D, so only the J2KImagProxy
- * knows which eye it is.
- */
- if (j2k && j2k->eye()) {
- eyes = j2k->eye().get() == dcp::Eye::LEFT ? Eyes::LEFT : Eyes::RIGHT;
- }
- }
- }
-
- _position = ContentTime::from_frames (frame, afr);
- } else {
- if (vft == VideoFrameType::THREE_D) {
- auto j2k = dynamic_pointer_cast<const J2KImageProxy>(image);
- if (j2k && j2k->eye()) {
- if (j2k->eye() == dcp::Eye::LEFT) {
- frame = _position->frames_round(afr) + 1;
- eyes = Eyes::LEFT;
- } else {
- frame = _position->frames_round(afr);
- eyes = Eyes::RIGHT;
- }
- }
- } else if (vft == VideoFrameType::THREE_D_ALTERNATE) {
- DCPOMATIC_ASSERT (_last_emitted_eyes);
- if (_last_emitted_eyes.get() == Eyes::RIGHT) {
- frame = _position->frames_round(afr) + 1;
- eyes = Eyes::LEFT;
- } else {
- frame = _position->frames_round(afr);
- eyes = Eyes::RIGHT;
- }
- } else {
- frame = _position->frames_round(afr) + 1;
- }
- }
-