ref: 7915c0a21037e53b0d65b4a0da200836b6939032
dir: /common/mp4v2/atom_text.cpp/
/*
* 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.
*
* Contributer has declined to give copyright information, and gives
* it freely to the world.
*/
#include "mp4common.h"
MP4TextAtom::MP4TextAtom()
: MP4Atom("text")
{
// The atom type "text" is used in two complete unrelated ways
// i.e. it's real two atoms with the same name
// To handle that we need to postpone property creation until
// we know who our parent atom is (stsd or gmhd) which gives us
// the context info we need to know who we are
}
void MP4TextAtom::AddPropertiesStsdType()
{
AddReserved("reserved1", 6); /* 0 */
AddProperty(new MP4Integer16Property("dataReferenceIndex"));/* 1 */
AddProperty(new MP4Integer32Property("displayFlags")); /* 2 */
AddProperty(new MP4Integer32Property("textJustification")); /* 3 */
AddProperty(new MP4Integer16Property("bgColorRed")); /* 4 */
AddProperty(new MP4Integer16Property("bgColorGreen")); /* 5 */
AddProperty(new MP4Integer16Property("bgColorBlue")); /* 6 */
AddProperty(new MP4Integer16Property("defTextBoxTop")); /* 7 */
AddProperty(new MP4Integer16Property("defTextBoxLeft")); /* 8 */
AddProperty(new MP4Integer16Property("defTextBoxBottom")); /* 9 */
AddProperty(new MP4Integer16Property("defTextBoxRight")); /* 10 */
AddReserved("reserved2", 8); /* 11 */
AddProperty(new MP4Integer16Property("fontNumber")); /* 12 */
AddProperty(new MP4Integer16Property("fontFace")); /* 13 */
AddReserved("reserved3", 1); /* 14 */
AddReserved("reserved4", 2); /* 15 */
AddProperty(new MP4Integer16Property("foreColorRed")); /* 16 */
AddProperty(new MP4Integer16Property("foreColorGreen")); /* 17 */
AddProperty(new MP4Integer16Property("foreColorBlue")); /* 18 */
}
void MP4TextAtom::AddPropertiesGmhdType()
{
AddProperty(new MP4BytesProperty("textData", 36)); /* 0 */
}
void MP4TextAtom::Generate()
{
if (ATOMID(m_pParentAtom->GetType()) == ATOMID("stsd")) {
AddPropertiesStsdType();
GenerateStsdType();
} else if (ATOMID(m_pParentAtom->GetType()) == ATOMID("gmhd")) {
AddPropertiesGmhdType();
GenerateGmhdType();
} else {
VERBOSE_WARNING(m_pFile->GetVerbosity(),
printf("Warning: text atom in unexpected context, can not generate"));
}
}
void MP4TextAtom::GenerateStsdType()
{
// generate children
MP4Atom::Generate();
((MP4Integer16Property*)m_pProperties[1])->SetValue(1);
((MP4Integer32Property*)m_pProperties[2])->SetValue(1);
((MP4Integer32Property*)m_pProperties[3])->SetValue(1);
}
void MP4TextAtom::GenerateGmhdType()
{
MP4Atom::Generate();
// property 0 has non-zero fixed values
static u_int8_t textData[36] = {
0x00, 0x01,
0x00, 0x00,
0x00, 0x00,
0x00, 0x00,
0x00, 0x00,
0x00, 0x00,
0x00, 0x00,
0x00, 0x00,
0x00, 0x01,
0x00, 0x00,
0x00, 0x00,
0x00, 0x00,
0x00, 0x00,
0x00, 0x00,
0x00, 0x00,
0x00, 0x00,
0x40, 0x00,
0x00, 0x00,
};
((MP4BytesProperty*)m_pProperties[0])->SetValue(textData, sizeof(textData));
}
void MP4TextAtom::Read ()
{
if (ATOMID(m_pParentAtom->GetType()) == ATOMID("stsd")) {
AddPropertiesStsdType();
} else if (ATOMID(m_pParentAtom->GetType()) == ATOMID("gmhd")) {
AddPropertiesGmhdType();
}
MP4Atom::Read();
}