clap.c

这个库实现了录象功能

/*******************************************************************************
 clap.c

 libquicktime - A library for reading and writing quicktime/avi/mp4 files.
 http://libquicktime.sourceforge.net

 Copyright (C) 2002 Heroine Virtual Ltd.
 Copyright (C) 2002-2007 Members of the libquicktime project.

 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., 51
 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*******************************************************************************/ 

/*

 Init, read, write handler for the "clap" (Clean Aperture) atom.

*/

#include "lqt_private.h"
#include <string.h>

void quicktime_clap_init(quicktime_clap_t *clap)
{
	memset(clap, 0, sizeof (*clap));
}

void quicktime_clap_delete(quicktime_clap_t *clap) { }

void quicktime_clap_dump(quicktime_clap_t *clap)
{

	lqt_dump("     clean aperture (clap)\n");
	lqt_dump("       cleanApertureWidthN %d\n", clap->cleanApertureWidthN);
	lqt_dump("       cleanApertureWidthD %d\n", clap->cleanApertureWidthD);
	lqt_dump("       cleanApertureHeightN %d\n", clap->cleanApertureHeightN);
	lqt_dump("       cleanApertureHeightD %d\n", clap->cleanApertureHeightD);
	lqt_dump("       horizOffN %d\n", clap->horizOffN);
	lqt_dump("       horizOffD %d\n", clap->horizOffD);
	lqt_dump("       vertOffN %d\n", clap->vertOffN);
	lqt_dump("       vertOffD %d\n", clap->vertOffD);
}

void quicktime_read_clap(quicktime_t *file, quicktime_clap_t *clap)
{
	clap->cleanApertureWidthN = quicktime_read_int32(file);
	clap->cleanApertureWidthD = quicktime_read_int32(file);
	clap->cleanApertureHeightN = quicktime_read_int32(file);
	clap->cleanApertureHeightD = quicktime_read_int32(file);
	clap->horizOffN = quicktime_read_int32(file);
	clap->horizOffD = quicktime_read_int32(file);
	clap->vertOffN = quicktime_read_int32(file);
	clap->vertOffD = quicktime_read_int32(file);
}

void quicktime_write_clap(quicktime_t *file, quicktime_clap_t *clap)
{
	quicktime_atom_t atom;

	quicktime_atom_write_header(file, &atom, "clap");
	quicktime_write_int32(file, clap->cleanApertureWidthN);
	quicktime_write_int32(file, clap->cleanApertureWidthD);
	quicktime_write_int32(file, clap->cleanApertureHeightN);
	quicktime_write_int32(file, clap->cleanApertureHeightD);
	quicktime_write_int32(file, clap->horizOffN);
	quicktime_write_int32(file, clap->horizOffD);
	quicktime_write_int32(file, clap->vertOffN);
	quicktime_write_int32(file, clap->vertOffD);
	quicktime_atom_write_footer(file, &atom);
}

int lqt_set_clap(quicktime_t *file, int track, quicktime_clap_t *clap)
{
	quicktime_clap_t *trk_clap;

	if	((track < 0) || (track >= file->total_vtracks))
		return 0;

	trk_clap = &file->vtracks[track].track->mdia.minf.stbl.stsd.table->clap;
	*trk_clap = *clap;
        file->vtracks[track].track->mdia.minf.stbl.stsd.table->has_clap = 1;
	return 1;
}

int lqt_get_clap(quicktime_t *file, int track, quicktime_clap_t *clap)
{
	quicktime_clap_t *trk_clap;

	if	((track < 0) || (track >= file->total_vtracks))
		return 0;
        if	(!file->vtracks[track].track->mdia.minf.stbl.stsd.table->has_clap)
		return 0;

        trk_clap = &file->vtracks[track].track->mdia.minf.stbl.stsd.table->clap;
	*clap = *trk_clap;
	return 1;
}