/usr/include/libavc1394/avc1394_vcr.h is in libavc1394-dev 0.5.4-4+b1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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* libavc1394 - GNU/Linux IEEE 1394 AV/C Library
*
* Originally written by Andreas Micklei <andreas.micklei@ivistar.de>
* Currently maintained by Dan Dennedy <dan@dennedy.org>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser 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
*/
#ifndef AVC1394_VCR_H
#define AVC1394_VCR_H 1
#include <libraw1394/raw1394.h>
#ifdef __cplusplus
extern "C" {
#endif
/* ##### Check to see if device is playing ##### */
int
avc1394_vcr_is_playing(raw1394handle_t handle, nodeid_t node);
/* ##### Check to see if the device is recording ##### */
int
avc1394_vcr_is_recording(raw1394handle_t handle, nodeid_t node);
/* ##### Tell the device to PLAY FORWARD ##### */
/* issue twice in a row to play forward at the slowest rate */
void
avc1394_vcr_play(raw1394handle_t handle, nodeid_t node);
/* ##### Tell the device to PLAY in REVERSE ##### */
/* issue twice in a row to play in reverse at the slowest rate */
void
avc1394_vcr_reverse(raw1394handle_t handle, nodeid_t node);
/* ##### exercise the trick play modes! ##### */
/* speed is a signed percentage value from -14 to +14 */
void
avc1394_vcr_trick_play(raw1394handle_t handle, nodeid_t node, int speed);
/* ##### Tell the device to STOP ##### */
void
avc1394_vcr_stop(raw1394handle_t handle, nodeid_t node);
/* ##### Tell the device to REWIND ##### */
void
avc1394_vcr_rewind(raw1394handle_t handle, nodeid_t node);
/* ##### Tell the device to PAUSE ##### */
void
avc1394_vcr_pause(raw1394handle_t handle, nodeid_t node);
/* ##### Tell the device to FAST FORWARD ##### */
void
avc1394_vcr_forward(raw1394handle_t handle, nodeid_t node);
/* ##### Tell the device goto NEXT frame ##### */
void
avc1394_vcr_next(raw1394handle_t handle, nodeid_t node);
/* ##### Tell the device goto NEXT index point ##### */
void
avc1394_vcr_next_index(raw1394handle_t handle, nodeid_t node);
/* ##### Tell the device goto PREVIOUS frame ##### */
void
avc1394_vcr_previous(raw1394handle_t handle, nodeid_t node);
/* ##### Tell the device goto PREVIOUS index point ##### */
void
avc1394_vcr_previous_index(raw1394handle_t handle, nodeid_t node);
/* ##### Tell the device to EJECT (usually not supported) ##### */
void
avc1394_vcr_eject(raw1394handle_t handle, nodeid_t node);
/* ##### Tell the device to RECORD ##### */
void
avc1394_vcr_record(raw1394handle_t handle, nodeid_t node);
/* ##### Ask the device for the status ##### */
quadlet_t
avc1394_vcr_status(raw1394handle_t handle, nodeid_t node);
/* Get a textual description of the status */
char *
avc1394_vcr_decode_status(quadlet_t response);
/* Get the time code on tape in format HH:MM:SS:FF */
/* This version allocates memory for the string, and
the caller is required to free it. */
char *
avc1394_vcr_get_timecode(raw1394handle_t handle, nodeid_t node)
__attribute__ ((deprecated));
/* This version requires a pre-allocated output string of at least 12
characters. */
int
avc1394_vcr_get_timecode2(raw1394handle_t handle, nodeid_t node, char *output);
/* Go to the time code on tape in format HH:MM:SS:FF */
void
avc1394_vcr_seek_timecode(raw1394handle_t handle, nodeid_t node, char *timecode);
#ifdef __cplusplus
}
#endif
#endif
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