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diff --git a/src/lib/film_state.h b/src/lib/film_state.h
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+/*
+    Copyright (C) 2012 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
+    the Free Software Foundation; either version 2 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program; if not, write to the Free Software
+    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+
+*/
+
+/** @file src/film_state.h
+ *  @brief The state of a Film.  This is separate from Film so that
+ *  state can easily be copied and kept around for reference
+ *  by long-running jobs.  This avoids the jobs getting confused
+ *  by the user changing Film settings during their run.
+ */
+
+#ifndef DVDOMATIC_FILM_STATE_H
+#define DVDOMATIC_FILM_STATE_H
+
+extern "C" {
+#include <libavcodec/avcodec.h>
+#include <libswscale/swscale.h>
+}
+#include "scaler.h"
+#include "util.h"
+#include "trim_action.h"
+
+class Format;
+class DCPContentType;
+class Filter;
+
+/** @class FilmState
+ *  @brief The state of a Film.
+ *
+ *  This is separate from Film so that state can easily be copied and
+ *  kept around for reference by long-running jobs.  This avoids the
+ *  jobs getting confused by the user changing Film settings during
+ *  their run.
+ */
+
+class FilmState
+{
+public:
+	FilmState ()
+		: dcp_content_type (0)
+		, frames_per_second (0)
+		, format (0)
+		, left_crop (0)
+		, right_crop (0)
+		, top_crop (0)
+		, bottom_crop (0)
+		, scaler (Scaler::from_id ("bicubic"))
+		, dcp_frames (0)
+		, dcp_trim_action (CUT)
+		, dcp_ab (false)
+		, audio_gain (0)
+		, audio_delay (0)
+		, still_duration (10)
+		, length (0)
+		, audio_channels (0)
+		, audio_sample_rate (0)
+		, audio_sample_format (AV_SAMPLE_FMT_NONE)
+	{}
+
+	std::string file (std::string f) const;
+	std::string dir (std::string d) const;
+
+	std::string content_path () const;
+	ContentType content_type () const;
+	
+	bool content_is_dvd () const;
+
+	std::string thumb_file (int) const;
+	int thumb_frame (int) const;
+	
+	void write_metadata (std::ofstream &) const;
+	void read_metadata (std::string, std::string);
+
+	Size cropped_size (Size) const;
+
+	/** Complete path to directory containing the film metadata;
+	    must not be relative.
+	*/
+	std::string directory;
+	/** Name for DVD-o-matic */
+	std::string name;
+	/** File or directory containing content; may be relative to our directory
+	 *  or an absolute path.
+	 */
+	std::string content;
+	/** The type of content that this Film represents (feature, trailer etc.) */
+	DCPContentType const * dcp_content_type;
+	/** Frames per second of the source */
+	float frames_per_second;
+	/** The format to present this Film in (flat, scope, etc.) */
+	Format const * format;
+	/** Number of pixels to crop from the left-hand side of the original picture */
+	int left_crop;
+	/** Number of pixels to crop from the right-hand side of the original picture */
+	int right_crop;
+	/** Number of pixels to crop from the top of the original picture */
+	int top_crop;
+	/** Number of pixels to crop from the bottom of the original picture */
+	int bottom_crop;
+	/** Video filters that should be used when generating DCPs */
+	std::vector<Filter const *> filters;
+	/** Scaler algorithm to use */
+	Scaler const * scaler;
+	/** Number of frames to put in the DCP, or 0 for all */
+	int dcp_frames;
+
+	TrimAction dcp_trim_action;
+		
+	/** true to create an A/B comparison DCP, where the left half of the image
+	    is the video without any filters or post-processing, and the right half
+	    has the specified filters and post-processing.
+	*/
+	bool dcp_ab;
+	/** Gain to apply to audio in dB */
+	float audio_gain;
+	/** Delay to apply to audio (positive moves audio later) in milliseconds */
+	int audio_delay;
+	/** Duration to make still-sourced films (in seconds) */
+	int still_duration;
+
+	/* Data which is cached to speed things up */
+
+	/** Vector of frame indices for each of our `thumbnails */
+	std::vector<int> thumbs;
+	/** Size, in pixels, of the source (ignoring cropping) */
+	Size size;
+	/** Length in frames */
+	int length;
+	/** Number of audio channels */
+	int audio_channels;
+	/** Sample rate of the audio, in Hz */
+	int audio_sample_rate;
+	/** Format of the audio samples */
+	AVSampleFormat audio_sample_format;
+
+private:
+	std::string thumb_file_for_frame (int) const;
+};
+
+#endif