/usr/share/gnome-speech/sources/swift/swiftsynthesisdriver.h is in gnome-speech-swift 1:0.4.25-5ubuntu2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 | /*
 * GNOME Speech - Speech services for the GNOME desktop
 *
 * Copyright 2006 Sun Microsystems Inc.
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Library General Public
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) any later version.
 *
 * This library 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
 * Library General Public License for more details.
 *
 * You should have received a copy of the GNU Library General Public
 * License along with this library; if not, write to the
 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
 * Boston, MA 02111-1307, USA.
 *
 * swiftsynthesisdriver.h: Definition of the SwiftSynthesisDriver
 *                           object-- a GNOME Speech driver for Cepstral's
 *                           Swift TTS engine (implementation in
 *                           swiftsynthesisdriver.c)
 */
#ifndef __SWIFT_SYNTHESIS_DRIVER_H_
#define __SWIFT_SYNTHESIS_DRIVER_H_
#include <bonobo/bonobo-object.h>
#include <gnome-speech/gnome-speech.h>
#define SWIFT_SYNTHESIS_DRIVER_TYPE        (swift_synthesis_driver_get_type ())
#define SWIFT_SYNTHESIS_DRIVER(o)          (G_TYPE_CHECK_INSTANCE_CAST((o), SWIFT_SYNTHESIS_DRIVER_TYPE, SwiftSynthesisDriver))
#define SWIFT_SYNTHESIS_DRIVER_CLASS(k)    (G_TYPE_CHECK_CLASS_CAST((k), swift_SYNTHESIS_driver_TYPE, SwiftSynthesisDriverClass))
#define SWIFT_SYNTHESIS_DRIVER_GET_CLASS(obj)     (G_TYPE_INSTANCE_GET_CLASS((obj), SWIFT_SYNTHESIS_DRIVER_TYPE, SwiftSynthesisDriverClass))
#define IS_SWIFT_SYNTHESIS_DRIVER(o)       (G_TYPE_CHECK_INSTANCE_TYPE((o), SWIFT_SYNTHESIS_DRIVER_TYPE))
#define IS_SWIFT_SYNTHESIS_DRIVER_CLASS(k) (G_TYPE_CHECK_CLASS_TYPE((k), SWIFT_SYNTHESIS_DRIVER_TYPE))
typedef struct {
	BonoboObject parent;
	gboolean     initialized;
        swift_engine *tts_engine;
        swift_port   *tts_port;
	gboolean     speaking;
	GSList       *utterances;
	guint        timeout_id;
	int          status_pipe[2];
} SwiftSynthesisDriver;
typedef struct {
	BonoboObjectClass parent_class;
	POA_GNOME_Speech_SynthesisDriver__epv epv;
} SwiftSynthesisDriverClass;
#include "swiftspeaker.h"
swift_result_t 
swift_event_callback (swift_event *event,
		      swift_event_t type,
		      void *udata);
GType
swift_synthesis_driver_get_type (void);
SwiftSynthesisDriver *
swift_synthesis_driver_new (void);
gint
swift_synthesis_driver_say (SwiftSynthesisDriver *d,
			    SwiftSpeaker *s,
			    const gchar *text);
gboolean
swift_synthesis_driver_stop (SwiftSynthesisDriver *d);
gboolean
swift_synthesis_driver_is_speaking (SwiftSynthesisDriver *d);
#endif /* __SWIFT_SYNTHESIS_DRIVER_H_ */
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