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/*
* This library is licensed under 2 different licenses and you
* can choose to use it under the terms of either one of them. The
* two licenses are the MPL 1.1 and the LGPL.
*
* MPL:
*
* The contents of this file are subject to the Mozilla Public License
* Version 1.1 (the "License"); you may not use this file except in
* compliance with the License. You may obtain a copy of the License at
* http://www.mozilla.org/MPL/.
*
* Software distributed under the License is distributed on an "AS IS"
* basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See the
* License for the specific language governing rights and limitations
* under the License.
*
* LGPL:
*
* 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.
*
* The Original Code is Fluendo MPEG Demuxer plugin.
*
* The Initial Developer of the Original Code is Fluendo, S.L.
* Portions created by Fluendo, S.L. are Copyright (C) 2005
* Fluendo, S.L. All Rights Reserved.
*
* Contributor(s): Wim Taymans <wim@fluendo.com>
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "gstsectionfilter.h"
#ifndef __always_inline
#if (__GNUC__ > 3) || (__GNUC__ == 3 && __GNUC_MINOR__ >= 1)
#define __always_inline inline __attribute__((always_inline))
#else
#define __always_inline inline
#endif
#endif
#ifndef DISABLE_INLINE
#define FORCE_INLINE __always_inline
#else
#define FORCE_INLINE
#endif
GST_DEBUG_CATEGORY (gstflusectionfilter_debug);
#define GST_CAT_DEFAULT (gstflusectionfilter_debug)
void
gst_section_filter_init (GstSectionFilter * filter)
{
g_return_if_fail (filter != NULL);
filter->adapter = gst_adapter_new ();
/* continuity counter can at max be 15
* we make 255 as an indication that
* there is no last continuity counter */
filter->last_continuity_counter = 255;
filter->section_length = G_MAXUINT16;
}
void
gst_section_filter_uninit (GstSectionFilter * filter)
{
g_return_if_fail (filter != NULL);
if (filter->adapter)
g_object_unref (filter->adapter);
filter->adapter = NULL;
}
void
gst_section_filter_clear (GstSectionFilter * filter)
{
g_return_if_fail (filter != NULL);
if (filter->adapter) {
gst_adapter_clear (filter->adapter);
filter->last_continuity_counter = 255;
filter->section_length = G_MAXUINT16;
}
}
static FORCE_INLINE gboolean
gst_section_is_complete (GstSectionFilter * filter)
{
/* section length measures size of section from 3 bytes into section
* (ie after section length field finished) until end of section)
*/
guint avail_bytes = gst_adapter_available (filter->adapter);
if (filter->section_length == avail_bytes - 3) {
return TRUE;
} else if (filter->section_length < (int) (avail_bytes - 3)) {
GST_DEBUG ("section length seems to be less than available bytes for "
"rest of section.");
return TRUE;
}
return FALSE;
}
/* returns True when section finished and ready to parse */
/* FIXME: especially for multi-section tables, we need to handle pusi correctly
* and handle cases where a new section starts in the same transport packet.
*/
gboolean
gst_section_filter_push (GstSectionFilter * filter, gboolean pusi, /* determines whether start or not */
guint8 continuity_counter, GstBuffer * buf)
{
g_return_val_if_fail (filter != NULL, FALSE);
/* check if it's the first packet of a section or
* if it continues the section */
if (pusi) {
const guint8 *data = GST_BUFFER_DATA (buf);
if (filter->last_continuity_counter != 255) {
GST_WARNING ("section lost, last continuity counter: %d"
"we now have a pusi at continuity counter: %d",
filter->last_continuity_counter, continuity_counter);
gst_section_filter_clear (filter);
}
filter->section_length = GST_READ_UINT16_BE (data + 1);
filter->section_length &= 0x0fff;
if (filter->section_length > 1021) {
GST_DEBUG ("section length too big");
goto failure;
}
gst_adapter_push (filter->adapter, buf);
filter->last_continuity_counter = continuity_counter;
return gst_section_is_complete (filter);
} else if (filter->last_continuity_counter == continuity_counter - 1 ||
(filter->last_continuity_counter == 15 && continuity_counter == 0)) {
GST_DEBUG ("section still going, no pusi");
gst_adapter_push (filter->adapter, buf);
filter->last_continuity_counter = continuity_counter;
return gst_section_is_complete (filter);
}
/* we have lost the section and we are not a start
* section, so clear what was in it */
else {
GST_WARNING ("section lost, last continuity counter: %d"
"new continuity counter but not pusi: %d",
filter->last_continuity_counter, continuity_counter);
gst_section_filter_clear (filter);
goto failure;
}
failure:
gst_buffer_unref (buf);
return FALSE;
}
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