1 /* ------------------------------------------------------------------ 2 * Copyright (C) 1998-2009 PacketVideo 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either 13 * express or implied. 14 * See the License for the specific language governing permissions 15 * and limitations under the License. 16 * ------------------------------------------------------------------- 17 */ 18 /*********************************************************************************/ 19 /* ------------------------------------------------------------------- */ 20 /* MPEG-4 MediaDataAtom Class */ 21 /* ------------------------------------------------------------------- */ 22 /*********************************************************************************/ 23 /* 24 This MediaDataAtom Class contains the media data. This class can operate in 25 either one of two ways - 1. it can store all it's data in memory (such as 26 during the creation of ObjectDescriptor streams), or 2. it can maintain all 27 it's data on disk (such as during the creation ofmedia streams - i.e. audio 28 and video). 29 30 Note that during reading in this atom from a file stream, the type is forced 31 to MEDIA_DATA_ON_DISK thereby keeping all the object data in the physical 32 file. 33 */ 34 35 #define IMPLEMENT_MediaDataAtom 36 37 #include "mediadataatom.h" 38 39 #include "atomutils.h" 40 #include "atomdefs.h" 41 42 // Stream-in Constructor MediaDataAtom(MP4_FF_FILE * fp,OSCL_wString & filename)43MediaDataAtom::MediaDataAtom(MP4_FF_FILE *fp, OSCL_wString& filename) 44 : Atom(fp) 45 { 46 OSCL_UNUSED_ARG(filename); 47 if (_success) 48 { 49 50 _type = MEDIA_DATA_ON_DISK; 51 52 // Seek past the end of the MEDIA_DATA_ATOM atom 53 int32 offset = getSize() - getDefaultSize(); 54 int32 filePointer; 55 filePointer = AtomUtils::getCurrentFilePosition(fp); 56 57 if ((filePointer + offset) == fp->_fileSize) 58 { 59 // LAST MDAT IN THE FILE 60 _success = true; 61 } 62 AtomUtils::seekFromStart(fp, (filePointer + offset)); 63 } 64 else 65 { 66 _mp4ErrorCode = READ_MEDIA_DATA_ATOM_FAILED; 67 } 68 } 69 70 // Destructor ~MediaDataAtom()71MediaDataAtom::~MediaDataAtom() 72 { 73 74 } 75 76