gecko/media/webvtt/cue.c

118 lines
3.3 KiB
C

/**
* Copyright (c) 2013 Mozilla Foundation and Contributors
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* - Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* - Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "parser_internal.h"
#include "cue_internal.h"
WEBVTT_EXPORT webvtt_status
webvtt_create_cue( webvtt_cue **pcue )
{
webvtt_cue *cue;
if( !pcue ) {
return WEBVTT_INVALID_PARAM;
}
cue = (webvtt_cue *)webvtt_alloc0( sizeof(*cue) );
if( !cue ) {
return WEBVTT_OUT_OF_MEMORY;
}
/**
* From http://dev.w3.org/html5/webvtt/#parsing (10/25/2012)
*
* Let cue's text track cue snap-to-lines flag be true.
*
* Let cue's text track cue line position be auto.
*
* Let cue's text track cue text position be 50.
*
* Let cue's text track cue size be 100.
*
* Let cue's text track cue alignment be middle alignment.
*/
webvtt_ref( &cue->refs );
webvtt_init_string( &cue->id );
cue->from = 0xFFFFFFFFFFFFFFFF;
cue->until = 0xFFFFFFFFFFFFFFFF;
cue->snap_to_lines = 1;
cue->settings.position = 50;
cue->settings.size = 100;
cue->settings.align = WEBVTT_ALIGN_MIDDLE;
cue->settings.line = WEBVTT_AUTO;
cue->settings.vertical = WEBVTT_HORIZONTAL;
*pcue = cue;
return WEBVTT_SUCCESS;
}
WEBVTT_EXPORT void
webvtt_ref_cue( webvtt_cue *cue )
{
if( cue ) {
webvtt_ref( &cue->refs );
}
}
WEBVTT_EXPORT void
webvtt_release_cue( webvtt_cue **pcue )
{
if( pcue && *pcue ) {
webvtt_cue *cue = *pcue;
*pcue = 0;
if( webvtt_deref( &cue->refs ) == 0 ) {
webvtt_release_string( &cue->id );
webvtt_release_node( &cue->node_head );
webvtt_free( cue );
}
}
}
WEBVTT_EXPORT int
webvtt_validate_cue( webvtt_cue *cue )
{
if( cue ) {
/**
* validate cue-times (Can't do checks against previously parsed cuetimes.
* That's the applications responsibility
*/
if( BAD_TIMESTAMP(cue->from) || BAD_TIMESTAMP(cue->until) ) {
goto error;
}
if( cue->until <= cue->from ) {
goto error;
}
/**
* Don't do any payload validation, because this would involve parsing the
* payload, which is optional.
*/
return 1;
}
error:
return 0;
}