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|
/*****************************************************************
|
| AP4 - vpcC Atoms
|
| Copyright 2002-2020 Axiomatic Systems, LLC
|
|
| This file is part of Bento4/AP4 (MP4 Atom Processing Library).
|
| Unless you have obtained Bento4 under a difference license,
| this version of Bento4 is Bento4|GPL.
| Bento4|GPL is free software; you can redistribute it and/or modify
| it under the terms of the GNU General Public License as published by
| the Free Software Foundation; either version 2, or (at your option)
| any later version.
|
| Bento4|GPL 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 General Public License for more details.
|
| You should have received a copy of the GNU General Public License
| along with Bento4|GPL; see the file COPYING. If not, write to the
| Free Software Foundation, 59 Temple Place - Suite 330, Boston, MA
| 02111-1307, USA.
|
****************************************************************/
/*----------------------------------------------------------------------
| includes
+---------------------------------------------------------------------*/
#include "Ap4VpccAtom.h"
#include "Ap4AtomFactory.h"
#include "Ap4Utils.h"
#include "Ap4Types.h"
#include "Ap4DataBuffer.h"
#include "Ap4Utils.h"
/*----------------------------------------------------------------------
| dynamic cast support
+---------------------------------------------------------------------*/
AP4_DEFINE_DYNAMIC_CAST_ANCHOR(AP4_VpccAtom)
/*----------------------------------------------------------------------
| AP4_VpccAtom::Create
+---------------------------------------------------------------------*/
AP4_VpccAtom*
AP4_VpccAtom::Create(AP4_Size size, AP4_ByteStream& stream)
{
AP4_UI08 version;
AP4_UI32 flags;
if (size < AP4_FULL_ATOM_HEADER_SIZE) return NULL;
if (AP4_FAILED(AP4_Atom::ReadFullHeader(stream, version, flags))) return NULL;
unsigned int payload_size = size - AP4_FULL_ATOM_HEADER_SIZE;
if (payload_size < 8) {
return NULL;
}
AP4_UI08 profile;
stream.ReadUI08(profile);
AP4_UI08 level;
stream.ReadUI08(level);
AP4_UI08 byte;
stream.ReadUI08(byte);
AP4_UI08 bit_depth = (byte >> 4) & 0XF;
AP4_UI08 chroma_subsampling = (byte >> 1) & 7;
bool video_full_range_flag = (byte & 1) != 0;
AP4_UI08 colour_primaries;
stream.ReadUI08(colour_primaries);
AP4_UI08 transfer_characteristics;
stream.ReadUI08(transfer_characteristics);
AP4_UI08 matrix_coefficients;
stream.ReadUI08(matrix_coefficients);
AP4_UI16 codec_initialization_data_size = 0;
stream.ReadUI16(codec_initialization_data_size);
if (codec_initialization_data_size > payload_size - 8) {
return NULL;
}
AP4_DataBuffer codec_initialization_data;
AP4_Result result = codec_initialization_data.SetDataSize(codec_initialization_data_size);
if (AP4_FAILED(result)) {
return NULL;
}
AP4_VpccAtom* atom = new AP4_VpccAtom(
profile, level, bit_depth, chroma_subsampling, video_full_range_flag, colour_primaries,
transfer_characteristics, matrix_coefficients, codec_initialization_data.GetData(),
codec_initialization_data.GetDataSize());
// store the data
stream.Seek(0);
AP4_DataBuffer bufferData;
bufferData.SetDataSize(payload_size);
stream.Read(bufferData.UseData(), bufferData.GetDataSize());
atom->SetData(bufferData);
return atom;
}
/*----------------------------------------------------------------------
| AP4_VpccAtom::AP4_VpccAtom
+---------------------------------------------------------------------*/
AP4_VpccAtom::AP4_VpccAtom(AP4_UI08 profile,
AP4_UI08 level,
AP4_UI08 bit_depth,
AP4_UI08 chroma_subsampling,
bool videofull_range_flag,
AP4_UI08 colour_primaries,
AP4_UI08 transfer_characteristics,
AP4_UI08 matrix_coefficients,
const AP4_UI08* codec_initialization_data,
unsigned int codec_initialization_data_size) :
AP4_Atom(AP4_ATOM_TYPE_VPCC, AP4_FULL_ATOM_HEADER_SIZE + 8 + codec_initialization_data_size, 1, 0),
m_Profile(profile),
m_Level(level),
m_BitDepth(bit_depth),
m_ChromaSubsampling(chroma_subsampling),
m_VideoFullRangeFlag(videofull_range_flag),
m_ColourPrimaries(colour_primaries),
m_TransferCharacteristics(transfer_characteristics),
m_MatrixCoefficients(matrix_coefficients)
{
if (codec_initialization_data && codec_initialization_data_size) {
m_CodecIntializationData.SetData(codec_initialization_data, codec_initialization_data_size);
}
}
/*----------------------------------------------------------------------
| AP4_VpccAtom::GetCodecString
+---------------------------------------------------------------------*/
AP4_Result
AP4_VpccAtom::GetCodecString(AP4_UI32 container_type, AP4_String& codec)
{
char type_name[5];
AP4_FormatFourChars(type_name, container_type);
char string[64];
AP4_FormatString(string,
sizeof(string),
"%s.%02d.%02d.%02d.%02d.%02d.%02d.%02d.%02d",
type_name,
m_Profile,
m_Level,
m_BitDepth,
m_ChromaSubsampling,
m_ColourPrimaries,
m_TransferCharacteristics,
m_MatrixCoefficients,
m_VideoFullRangeFlag ? 1 : 0);
codec = string;
return AP4_SUCCESS;
}
/*----------------------------------------------------------------------
| AP4_VpccAtom::WriteFields
+---------------------------------------------------------------------*/
AP4_Result
AP4_VpccAtom::WriteFields(AP4_ByteStream& stream)
{
stream.WriteUI08(m_Profile);
stream.WriteUI08(m_Level);
stream.WriteUI08((m_BitDepth << 4) | (m_ChromaSubsampling << 1) | (m_VideoFullRangeFlag ? 1 : 0));
stream.WriteUI08(m_ColourPrimaries);
stream.WriteUI08(m_TransferCharacteristics);
stream.WriteUI08(m_MatrixCoefficients);
stream.WriteUI16((AP4_UI16)m_CodecIntializationData.GetDataSize());
stream.Write(m_CodecIntializationData.GetData(), m_CodecIntializationData.GetDataSize());
return AP4_SUCCESS;
}
/*----------------------------------------------------------------------
| AP4_VpccAtom::InspectFields
+---------------------------------------------------------------------*/
AP4_Result
AP4_VpccAtom::InspectFields(AP4_AtomInspector& inspector)
{
inspector.AddField("profile", m_Profile);
inspector.AddField("level", m_Level);
inspector.AddField("bit depth", m_BitDepth);
inspector.AddField("chroma subsampling", m_ChromaSubsampling);
inspector.AddField("video full range flag", m_VideoFullRangeFlag);
inspector.AddField("colour primaries", m_ColourPrimaries);
inspector.AddField("matrix coefficients", m_MatrixCoefficients);
inspector.AddField("codec initialization data",
m_CodecIntializationData.GetData(),
m_CodecIntializationData.GetDataSize());
return AP4_SUCCESS;
}
|
