atom_trun.cpp
资源名称:NETVIDEO.rar [点击查看]
上传用户:sun1608
上传日期:2007-02-02
资源大小:6116k
文件大小:2k
源码类别:
流媒体/Mpeg4/MP4
开发平台:
Visual C++
- /*
- * 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.
- *
- * The Original Code is MPEG4IP.
- *
- * The Initial Developer of the Original Code is Cisco Systems Inc.
- * Portions created by Cisco Systems Inc. are
- * Copyright (C) Cisco Systems Inc. 2001. All Rights Reserved.
- *
- * Contributor(s):
- * Dave Mackie dmackie@cisco.com
- */
- #include "mp4common.h"
- MP4TrunAtom::MP4TrunAtom()
- : MP4Atom("trun")
- {
- AddVersionAndFlags(); /* 0, 1 */
- AddProperty( /* 2 */
- new MP4Integer32Property("sampleCount"));
- }
- void MP4TrunAtom::AddProperties(u_int32_t flags)
- {
- if (flags & 0x01) {
- // Note this is a signed 32 value
- AddProperty(
- new MP4Integer32Property("dataOffset"));
- }
- if (flags & 0x04) {
- AddProperty(
- new MP4Integer32Property("firstSampleFlags"));
- }
- MP4TableProperty* pTable =
- new MP4TableProperty("samples", m_pProperties[2]);
- AddProperty(pTable);
- if (flags & 0x100) {
- pTable->AddProperty(
- new MP4Integer32Property("sampleDuration"));
- }
- if (flags & 0x200) {
- pTable->AddProperty(
- new MP4Integer32Property("sampleSize"));
- }
- if (flags & 0x400) {
- pTable->AddProperty(
- new MP4Integer32Property("sampleFlags"));
- }
- if (flags & 0x800) {
- pTable->AddProperty(
- new MP4Integer32Property("sampleCompositionTimeOffset"));
- }
- }
- void MP4TrunAtom::Read()
- {
- /* read atom version, flags, and sampleCount */
- ReadProperties(0, 3);
- /* need to create the properties based on the atom flags */
- AddProperties(GetFlags());
- /* now we can read the remaining properties */
- ReadProperties(3);
- Skip(); // to end of atom
- }