X-Git-Url: https://git.carlh.net/gitweb/?a=blobdiff_plain;f=src%2Flib%2Fvideo_decoder.cc;h=bd609d1683ddd0fca0ee82ca9da8bd7eeaed725b;hb=c86ed0c80b762d31eb68386662a7c37ae4e21b6b;hp=3a88911118e4054bf2c2d2eecae6b59a50fa055a;hpb=c94f29d333e1b81aabbc396920250844460d46f6;p=dcpomatic.git

diff --git a/src/lib/video_decoder.cc b/src/lib/video_decoder.cc
index 3a8891111..bd609d168 100644
--- a/src/lib/video_decoder.cc
+++ b/src/lib/video_decoder.cc
@@ -1,5 +1,5 @@
 /*
-    Copyright (C) 2012 Carl Hetherington <cth@carlh.net>
+    Copyright (C) 2012-2014 Carl Hetherington <cth@carlh.net>
 
     This program is free software; you can redistribute it and/or modify
     it under the terms of the GNU General Public License as published by
@@ -19,34 +19,152 @@
 
 #include "video_decoder.h"
 #include "image.h"
+#include "content_video.h"
 
 #include "i18n.h"
 
 using std::cout;
+using std::list;
 using boost::shared_ptr;
 using boost::optional;
 
-VideoDecoder::VideoDecoder (shared_ptr<const Film> f, shared_ptr<const VideoContent> c)
-	: Decoder (f)
+VideoDecoder::VideoDecoder (shared_ptr<const VideoContent> c)
+#ifdef DCPOMATIC_DEBUG
+	: test_gaps (0)
 	, _video_content (c)
+#else
+	: _video_content (c)
+#endif
 {
 
 }
 
+optional<ContentVideo>
+VideoDecoder::decoded_video (VideoFrame frame)
+{
+	for (list<ContentVideo>::const_iterator i = _decoded_video.begin(); i != _decoded_video.end(); ++i) {
+		if (i->frame == frame) {
+			return *i;
+		}
+	}
+
+	return optional<ContentVideo> ();
+}
+
+optional<ContentVideo>
+VideoDecoder::get_video (VideoFrame frame, bool accurate)
+{
+	if (_decoded_video.empty() || (frame < _decoded_video.front().frame || frame > (_decoded_video.back().frame + 1))) {
+		/* Either we have no decoded data, or what we do have is a long way from what we want: seek */
+		seek (ContentTime::from_frames (frame, _video_content->video_frame_rate()), accurate);
+	}
+
+	optional<ContentVideo> dec;
+
+	/* Now enough pass() calls should either:
+	 *  (a) give us what we want, or
+	 *  (b) hit the end of the decoder.
+	 */
+	if (accurate) {
+		/* We are being accurate, so we want the right frame.
+		 * This could all be one statement but it's split up for clarity.
+		 */
+		while (true) {
+			if (decoded_video (frame)) {
+				/* We got what we want */
+				break;
+			}
+
+			if (pass ()) {
+				/* The decoder has nothing more for us */
+				break;
+			}
+
+			if (!_decoded_video.empty() && _decoded_video.front().frame > frame) {
+				/* We're never going to get the frame we want.  Perhaps the caller is asking
+				 * for a video frame before the content's video starts (if its audio
+				 * begins before its video, for example).
+				 */
+				break;
+			}
+		}
+
+		dec = decoded_video (frame);
+	} else {
+		/* Any frame will do: use the first one that comes out of pass() */
+		while (_decoded_video.empty() && !pass ()) {}
+		if (!_decoded_video.empty ()) {
+			dec = _decoded_video.front ();
+		}
+	}
+
+	/* Clean up decoded_video */
+	while (!_decoded_video.empty() && _decoded_video.front().frame < (frame - 1)) {
+		_decoded_video.pop_front ();
+	}
+
+	return dec;
+}
+
+
 /** Called by subclasses when they have a video frame ready */
 void
-VideoDecoder::video (shared_ptr<const Image> image, bool same, ContentTime time)
+VideoDecoder::video (shared_ptr<const Image> image, VideoFrame frame)
 {
+	/* We should not receive the same thing twice */
+	assert (_decoded_video.empty() || frame != _decoded_video.back().frame);
+
+	/* Fill in gaps */
+	/* XXX: 3D */
+
+	while (!_decoded_video.empty () && (_decoded_video.back().frame + 1) < frame) {
+#ifdef DCPOMATIC_DEBUG
+		test_gaps++;
+#endif
+		_decoded_video.push_back (
+			ContentVideo (
+				_decoded_video.back().image,
+				_decoded_video.back().eyes,
+				_decoded_video.back().frame + 1
+				)
+			);
+	}
+	
 	switch (_video_content->video_frame_type ()) {
 	case VIDEO_FRAME_TYPE_2D:
-		_pending.push_back (shared_ptr<DecodedVideo> (new DecodedVideo (image, EYES_BOTH, same, time)));
+		_decoded_video.push_back (ContentVideo (image, EYES_BOTH, frame));
+		break;
+	case VIDEO_FRAME_TYPE_3D_ALTERNATE:
+		_decoded_video.push_back (ContentVideo (image, (frame % 2) ? EYES_RIGHT : EYES_LEFT, frame));
 		break;
 	case VIDEO_FRAME_TYPE_3D_LEFT_RIGHT:
 	{
 		int const half = image->size().width / 2;
-		_pending.push_back (shared_ptr<DecodedVideo> (new DecodedVideo (image->crop (Crop (0, half, 0, 0), true), EYES_LEFT, same, time)));
-		_pending.push_back (shared_ptr<DecodedVideo> (new DecodedVideo (image->crop (Crop (half, 0, 0, 0), true), EYES_RIGHT, same, time)));
+		_decoded_video.push_back (ContentVideo (image->crop (Crop (0, half, 0, 0), true), EYES_LEFT, frame));
+		_decoded_video.push_back (ContentVideo (image->crop (Crop (half, 0, 0, 0), true), EYES_RIGHT, frame));
+		break;
+	}
+	case VIDEO_FRAME_TYPE_3D_TOP_BOTTOM:
+	{
+		int const half = image->size().height / 2;
+		_decoded_video.push_back (ContentVideo (image->crop (Crop (0, 0, 0, half), true), EYES_LEFT, frame));
+		_decoded_video.push_back (ContentVideo (image->crop (Crop (0, 0, half, 0), true), EYES_RIGHT, frame));
 		break;
 	}
+	case VIDEO_FRAME_TYPE_3D_LEFT:
+		_decoded_video.push_back (ContentVideo (image, EYES_LEFT, frame));
+		break;
+	case VIDEO_FRAME_TYPE_3D_RIGHT:
+		_decoded_video.push_back (ContentVideo (image, EYES_RIGHT, frame));
+		break;
+	default:
+		assert (false);
 	}
 }
+
+void
+VideoDecoder::seek (ContentTime, bool)
+{
+	_decoded_video.clear ();
+}
+