Basic video fade support.

[dcpomatic.git] / src / lib / video_decoder.cc

diff --git a/src/lib/video_decoder.cc b/src/lib/video_decoder.cc
index bfd7a7e3ef6abeb9a2d3457aaa76894aa060e753..64c66ea55caf8bc64adb863aac01966e314820d2 100644 (file)
--- a/src/lib/video_decoder.cc
+++ b/src/lib/video_decoder.cc
@@ -19,12 +19,14 @@
 
 #include "video_decoder.h"
 #include "image.h"
+#include "image_proxy.h"
 #include "content_video.h"
 
 #include "i18n.h"
 
 using std::cout;
 using std::list;
+using std::max;
 using boost::shared_ptr;
 using boost::optional;
 
@@ -35,6 +37,7 @@ VideoDecoder::VideoDecoder (shared_ptr<const VideoContent> c)
 #else
        : _video_content (c)
 #endif
+       , _same (false)
 {
 
 }
@@ -123,8 +126,10 @@ VideoDecoder::get_video (VideoFrame frame, bool accurate)
 void
 VideoDecoder::video (shared_ptr<const ImageProxy> image, VideoFrame frame)
 {
-       /* We should not receive the same thing twice */
-       assert (_decoded_video.empty() || frame != _decoded_video.back().frame);
+       /* We may receive the same frame index twice for 3D, and we need to know
+          when that happens.
+       */
+       _same = (!_decoded_video.empty() && frame == _decoded_video.back().frame);
 
        /* Fill in gaps */
        /* XXX: 3D */
@@ -148,7 +153,7 @@ VideoDecoder::video (shared_ptr<const ImageProxy> image, VideoFrame frame)
                _decoded_video.push_back (ContentVideo (image, EYES_BOTH, PART_WHOLE, frame));
                break;
        case VIDEO_FRAME_TYPE_3D_ALTERNATE:
-               _decoded_video.push_back (ContentVideo (image, (frame % 2) ? EYES_RIGHT : EYES_LEFT, PART_WHOLE, frame));
+               _decoded_video.push_back (ContentVideo (image, _same ? EYES_RIGHT : EYES_LEFT, PART_WHOLE, frame));
                break;
        case VIDEO_FRAME_TYPE_3D_LEFT_RIGHT:
                _decoded_video.push_back (ContentVideo (image, EYES_LEFT, PART_LEFT_HALF, frame));