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diff --git a/ccast/ccast.h b/ccast/ccast.h
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+#ifndef CCAST_H
+#define CCAST_H
+
+/* 
+ * Argyll Color Correction System
+ * ChromCast public API support
+ *
+ * Author: Graeme W. Gill
+ * Date:   8/9/2014
+ *
+ * Copyright 2014 Graeme W. Gill
+ * All rights reserved.
+ *
+ * This material is licenced under the GNU AFFERO GENERAL PUBLIC LICENSE Version 3 :-
+ * see the License2.txt file for licencing details.
+ *
+ */
+
+/*
+ * This class provides simple access to the Google ChromeCast
+ * for the purposes of generating Video Test patches.
+ */
+
+#include "ccmdns.h"		/* Function to get a list of ChromeCasts */
+
+/* A ChromCast instance */
+struct _ccast {
+	ccast_id id;		/* Id of CromeCast being accessed */
+	struct _ccmessv *messv;
+	int requestId;
+
+	char *sessionId;
+	char *transportId;
+
+	/* Delete the ccast */
+	void (*del)(struct _ccast *p);
+
+	/* Load a URL */
+	int (*load)(struct _ccast *p, char *url, unsigned char *data, size_t dlen,
+		     double bg[3], double x, double y, double w, double h);
+
+	/* Shut it down */
+	void (*shutdown)(struct _ccast *p);
+
+	/* Get the extra load delay */
+	int (*get_load_delay)(struct _ccast *p);
+
+	/* Return nz if we can send PNG directly as base64 + bg RGB, */
+	/* else have to setup webserver and send URL */
+	int (*get_direct_send)(struct _ccast *p);
+
+	/* Thread context */
+	athread *rmesth;				/* Receive message thread */
+	struct _ccmes *rmes;			/* Linked list of received messages */
+	amutex rlock;					/* Receive list lock protecting rmes */
+	acond rcond;					/* Condition for client to wait on */
+	int w_rq;						/* NZ if client is waiting on message */
+	char *w_rqns;					/* Message namespac client is waiting for (if !NULL) */
+	int w_rqid;						/* Message rqid client is waiting for (0 = any) */
+	volatile int stop;				/* Thread stop flag */
+	volatile int stopped;			/* Thread reply flag */
+
+	/* Other */
+	int mediaSessionId;
+	int loaded1;					/* Set to nz if at least one load succeeded */
+	int forcedef;					/* Force using default reciever rather than patgen */
+	int patgenrcv;					/* nz if pattern generator receiver, else default receiver */
+	int load_delay;					/* Delay needed after succesful LOAD */
+
+	struct _ccast *next;			/* Next in static list for signal cleanup */
+}; typedef struct _ccast ccast;
+
+/* Create a new ChromeCast */
+/* Return NULL on error */
+/* nz forcedef to force using default reciever & web server rather than pattern generator app. */
+/* Can also set environment variabl "ARGYLL_CCAST_DEFAULT_RECEIVER" to do this. */
+ccast *new_ccast(ccast_id *id, int forcedef);
+
+/* Quantization model of ChromCast and TV */
+/* ctx is a placeholder, and can be NULL */
+
+/* Input & output RGB 0.0 - 1.0 levels */
+void ccastQuant(void *ctx, double out[3], double in[3]);
+
+/* Input RGB 8 bit 0 - 255 levels, output YCbCr 8 bit 16 - 235 levels */
+void ccast2YCbCr(void *ctx, double out[3], double in[3]);
+
+/* Input RGB 8 bit 0 - 255 levels, output YCbCr 8 bit 16 - 235 levels */
+/* non-quanized or clipped */
+void ccast2YCbCr_nq(void *ctx, double out[3], double in[3]);
+
+/* Input YCbCr 8 bit 16 - 235 levels output RGB 8 bit 0 - 255 levels. */
+/* Return nz if the output was clipped */
+int YCbCr2ccast(void *ctx, double out[3], double in[3]);
+
+/* Input YCbCr 8 bit 16 - 235 levels output RGB 8 bit 0 - 255 levels. */
+/* non-quanized or clipped */
+void YCbCr2ccast_nq(void *ctx, double out[3], double in[3]);
+
+#define CCDITHSIZE 4
+
+/* Compute pattern [width][height] */
+/* return the delta to the target */
+double get_ccast_dith(double ipat[CCDITHSIZE][CCDITHSIZE][3], double val[3]);
+
+#define CCAST_H
+#endif /* CCAST_H */
+