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164 lines
5.4 KiB
C
164 lines
5.4 KiB
C
/*
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* This library is licensed under 2 different licenses and you
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* can choose to use it under the terms of either one of them. The
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* two licenses are the MPL 1.1 and the LGPL.
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*
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* MPL:
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*
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* The contents of this file are subject to the Mozilla Public License
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* Version 1.1 (the "License"); you may not use this file except in
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* compliance with the License. You may obtain a copy of the License at
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* http://www.mozilla.org/MPL/.
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*
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* Software distributed under the License is distributed on an "AS IS"
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* basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See the
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* License for the specific language governing rights and limitations
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* under the License.
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*
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* LGPL:
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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* Boston, MA 02111-1307, USA.
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*
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* The Original Code is Fluendo MPEG Demuxer plugin.
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*
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* The Initial Developer of the Original Code is Fluendo, S.L.
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* Portions created by Fluendo, S.L. are Copyright (C) 2005
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* Fluendo, S.L. All Rights Reserved.
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*
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* Contributor(s): Wim Taymans <wim@fluendo.com>
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*/
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include "gstsectionfilter.h"
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#ifndef __always_inline
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#if (__GNUC__ > 3) || (__GNUC__ == 3 && __GNUC_MINOR__ >= 1)
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#define __always_inline inline __attribute__((always_inline))
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#else
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#define __always_inline inline
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#endif
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#endif
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#ifndef DISABLE_INLINE
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#define FORCE_INLINE __always_inline
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#else
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#define FORCE_INLINE
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#endif
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GST_DEBUG_CATEGORY (gstflusectionfilter_debug);
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#define GST_CAT_DEFAULT (gstflusectionfilter_debug)
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void
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gst_section_filter_init (GstSectionFilter * filter)
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{
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g_return_if_fail (filter != NULL);
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filter->adapter = gst_adapter_new ();
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/* continuity counter can at max be 15
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* we make 255 as an indication that
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* there is no last continuity counter */
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filter->last_continuity_counter = 255;
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filter->section_length = G_MAXUINT16;
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}
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void
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gst_section_filter_uninit (GstSectionFilter * filter)
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{
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g_return_if_fail (filter != NULL);
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if (filter->adapter)
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g_object_unref (filter->adapter);
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filter->adapter = NULL;
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}
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void
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gst_section_filter_clear (GstSectionFilter * filter)
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{
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g_return_if_fail (filter != NULL);
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if (filter->adapter) {
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gst_adapter_clear (filter->adapter);
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filter->last_continuity_counter = 255;
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filter->section_length = G_MAXUINT16;
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}
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}
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static FORCE_INLINE gboolean
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gst_section_is_complete (GstSectionFilter * filter)
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{
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/* section length measures size of section from 3 bytes into section
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* (ie after section length field finished) until end of section)
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*/
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guint avail_bytes = gst_adapter_available (filter->adapter);
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if (filter->section_length == avail_bytes - 3) {
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return TRUE;
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} else if (filter->section_length < (int) (avail_bytes - 3)) {
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GST_DEBUG ("section length seems to be less than available bytes for "
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"rest of section.");
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return TRUE;
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}
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return FALSE;
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}
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/* returns True when section finished and ready to parse */
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/* FIXME: especially for multi-section tables, we need to handle pusi correctly
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* and handle cases where a new section starts in the same transport packet.
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*/
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gboolean
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gst_section_filter_push (GstSectionFilter * filter, gboolean pusi, /* determines whether start or not */
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guint8 continuity_counter, GstBuffer * buf)
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{
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g_return_val_if_fail (filter != NULL, FALSE);
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/* check if it's the first packet of a section or
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* if it continues the section */
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if (pusi) {
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const guint8 *data = GST_BUFFER_DATA (buf);
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if (filter->last_continuity_counter != 255) {
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GST_WARNING ("section lost, last continuity counter: %d"
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"we now have a pusi at continuity counter: %d",
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filter->last_continuity_counter, continuity_counter);
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gst_section_filter_clear (filter);
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}
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filter->section_length = GST_READ_UINT16_BE (data + 1);
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filter->section_length &= 0x0fff;
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if (filter->section_length > 4093) {
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GST_DEBUG ("section length too big");
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goto failure;
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}
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gst_adapter_push (filter->adapter, buf);
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filter->last_continuity_counter = continuity_counter;
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return gst_section_is_complete (filter);
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} else if (filter->last_continuity_counter == continuity_counter - 1 ||
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(filter->last_continuity_counter == 15 && continuity_counter == 0)) {
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GST_DEBUG ("section still going, no pusi");
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gst_adapter_push (filter->adapter, buf);
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filter->last_continuity_counter = continuity_counter;
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return gst_section_is_complete (filter);
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}
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/* we have lost the section and we are not a start
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* section, so clear what was in it */
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else {
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GST_WARNING ("section lost, last continuity counter: %d"
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"new continuity counter but not pusi: %d",
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filter->last_continuity_counter, continuity_counter);
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gst_section_filter_clear (filter);
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goto failure;
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}
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failure:
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gst_buffer_unref (buf);
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return FALSE;
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}
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