gstreamer/subprojects/gst-plugins-bad/sys/dwrite/libcaption/xds.c

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/**********************************************************************************************/
/* The MIT License */
/* */
/* Copyright 2016-2017 Twitch Interactive, Inc. or its affiliates. All Rights Reserved. */
/* */
/* Permission is hereby granted, free of charge, to any person obtaining a copy */
/* of this software and associated documentation files (the "Software"), to deal */
/* in the Software without restriction, including without limitation the rights */
/* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell */
/* copies of the Software, and to permit persons to whom the Software is */
/* furnished to do so, subject to the following conditions: */
/* */
/* The above copyright notice and this permission notice shall be included in */
/* all copies or substantial portions of the Software. */
/* */
/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR */
/* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, */
/* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE */
/* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER */
/* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, */
/* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN */
/* THE SOFTWARE. */
/**********************************************************************************************/
// http://www.theneitherworld.com/mcpoodle/SCC_TOOLS/DOCS/CC_XDS.HTML#PR
#include "xds.h"
#include "caption.h"
#include <string.h>
void
xds_init (xds_t * xds)
{
memset (xds, 0, sizeof (xds_t));
}
int
xds_decode (xds_t * xds, uint16_t cc)
{
switch (xds->state) {
default:
case 0:
xds_init (xds);
xds->class_code = (cc & 0x0F00) >> 8;
xds->type = (cc & 0x000F);
xds->state = 1;
return LIBCAPTION_OK;
case 1:
if (0x8F00 == (cc & 0xFF00)) {
xds->checksum = (cc & 0x007F);
xds->state = 0;
return LIBCAPTION_READY;
}
if (xds->size < 32) {
xds->content[xds->size + 0] = (cc & 0x7F00) >> 8;
xds->content[xds->size + 1] = (cc & 0x007F);
xds->size += 2;
return LIBCAPTION_OK;
}
}
xds->state = 0;
return LIBCAPTION_ERROR;
}