From 74040395aa25ade07f62f97d8a199b919b7487a2 Mon Sep 17 00:00:00 2001
From: Carl Hetherington <cth@carlh.net>
Date: Mon, 6 May 2013 14:51:14 +0100
Subject: Re-use ImageMagickDecoders when possible.

---
 src/lib/imagemagick_decoder.h |  4 ++++
 src/lib/player.cc             | 17 +++++++++++++++--
 2 files changed, 19 insertions(+), 2 deletions(-)

(limited to 'src/lib')

diff --git a/src/lib/imagemagick_decoder.h b/src/lib/imagemagick_decoder.h
index 12a40976b..cb68655ce 100644
--- a/src/lib/imagemagick_decoder.h
+++ b/src/lib/imagemagick_decoder.h
@@ -40,6 +40,10 @@ public:
 	bool seek (double);
 	bool pass ();
 
+	boost::shared_ptr<const ImageMagickContent> content () const {
+		return _imagemagick_content;
+	}
+
 protected:
 	PixelFormat pixel_format () const;
 
diff --git a/src/lib/player.cc b/src/lib/player.cc
index a3d52f43e..d86437cd2 100644
--- a/src/lib/player.cc
+++ b/src/lib/player.cc
@@ -219,6 +219,8 @@ Player::seek_forward ()
 void
 Player::setup_decoders ()
 {
+	vector<shared_ptr<VideoDecoder> > old_video_decoders = _video_decoders;
+
 	_video_decoders.clear ();
 	_video_decoder = 0;
 	_audio_decoders.clear ();
@@ -260,10 +262,21 @@ Player::setup_decoders ()
 			shared_ptr<const ImageMagickContent> ic = dynamic_pointer_cast<const ImageMagickContent> (*i);
 			if (ic) {
 				video_content = ic;
-				video_decoder.reset (new ImageMagickDecoder (_film, ic));
+
+				/* See if we can re-use an old ImageMagickDecoder */
+				for (vector<shared_ptr<VideoDecoder> >::const_iterator i = old_video_decoders.begin(); i != old_video_decoders.end(); ++i) {
+					shared_ptr<ImageMagickDecoder> imd = dynamic_pointer_cast<ImageMagickDecoder> (*i);
+					if (imd && imd->content() == ic) {
+						video_decoder = *i;
+					}
+				}
+
+				if (!video_decoder) {
+					video_decoder.reset (new ImageMagickDecoder (_film, ic));
+					video_decoder->connect_video (shared_from_this ());
+				}
 			}
 			
-			video_decoder->connect_video (shared_from_this ());
 			_video_decoders.push_back (video_decoder);
 			_video_start.push_back (video_so_far);
 			video_so_far += video_content->video_length() / video_content->video_frame_rate();
-- 
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