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213 lines
8.1 KiB
C++
213 lines
8.1 KiB
C++
/*****************************************************************
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| AP4 - dec3 Atoms
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| Copyright 2002-2008 Axiomatic Systems, LLC
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| This file is part of Bento4/AP4 (MP4 Atom Processing Library).
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| Unless you have obtained Bento4 under a difference license,
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| this version of Bento4 is Bento4|GPL.
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| Bento4|GPL is free software; you can redistribute it and/or modify
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| it under the terms of the GNU General Public License as published by
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| the Free Software Foundation; either version 2, or (at your option)
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| any later version.
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| Bento4|GPL 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
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| GNU General Public License for more details.
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| You should have received a copy of the GNU General Public License
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| along with Bento4|GPL; see the file COPYING. If not, write to the
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| Free Software Foundation, 59 Temple Place - Suite 330, Boston, MA
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| 02111-1307, USA.
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****************************************************************/
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/*----------------------------------------------------------------------
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| includes
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+---------------------------------------------------------------------*/
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#include "Ap4Dec3Atom.h"
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#include "Ap4AtomFactory.h"
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#include "Ap4Utils.h"
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#include "Ap4Types.h"
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/*----------------------------------------------------------------------
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| dynamic cast support
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+---------------------------------------------------------------------*/
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AP4_DEFINE_DYNAMIC_CAST_ANCHOR(AP4_Dec3Atom)
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/*----------------------------------------------------------------------
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| AP4_Dec3Atom::Create
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+---------------------------------------------------------------------*/
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AP4_Dec3Atom*
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AP4_Dec3Atom::Create(AP4_Size size, AP4_ByteStream& stream)
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{
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// read the raw bytes in a buffer
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unsigned int payload_size = size-AP4_ATOM_HEADER_SIZE;
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AP4_DataBuffer payload_data(payload_size);
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AP4_Result result = stream.Read(payload_data.UseData(), payload_size);
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if (AP4_FAILED(result)) return NULL;
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// check the version
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const AP4_UI08* payload = payload_data.GetData();
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return new AP4_Dec3Atom(size, payload);
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}
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/*----------------------------------------------------------------------
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| AP4_Dec3Atom::AP4_Dec3Atom
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+---------------------------------------------------------------------*/
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AP4_Dec3Atom::AP4_Dec3Atom(const AP4_Dec3Atom& other):
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AP4_Atom(AP4_ATOM_TYPE_DEC3, other.m_Size32),
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m_DataRate(other.m_DataRate),
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m_FlagEC3ExtensionTypeA(other.m_FlagEC3ExtensionTypeA),
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m_ComplexityIndexTypeA(other.m_ComplexityIndexTypeA),
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m_SubStreams(other.m_SubStreams),
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m_RawBytes(other.m_RawBytes)
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{
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}
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/*----------------------------------------------------------------------
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| AP4_Dec3Atom::AP4_Dec3Atom
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+---------------------------------------------------------------------*/
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AP4_Dec3Atom::AP4_Dec3Atom():
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AP4_Atom(AP4_ATOM_TYPE_DEC3, AP4_ATOM_HEADER_SIZE),
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m_DataRate(0),
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m_FlagEC3ExtensionTypeA(0),
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m_ComplexityIndexTypeA(0)
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{
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m_SubStreams.Append(SubStream());
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}
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/*----------------------------------------------------------------------
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| AP4_Dec3Atom::AP4_Dec3Atom
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+---------------------------------------------------------------------*/
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AP4_Dec3Atom::AP4_Dec3Atom(AP4_UI32 au_size, const SubStream* substream, const unsigned int complexity_index_type_a):
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AP4_Atom(AP4_ATOM_TYPE_DEC3, AP4_ATOM_HEADER_SIZE)
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{
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AP4_BitWriter bits(7); // I0 + D0 or 5.1 DD+ JOC is the most complicated stream
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unsigned int date_rate = au_size / 4;
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unsigned int num_ind_sub = 0; // num_ind_sub is set to 0 which is ensured by E-AC-3 parser.
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bits.Write(date_rate, 13);
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bits.Write(num_ind_sub, 3);
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for (unsigned int idx = 0; idx < num_ind_sub + 1; idx ++) {
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bits.Write(substream->fscod, 2);
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bits.Write(substream->bsid , 5);
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bits.Write(0, 1); // reserved
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bits.Write(0, 1); // asvc is always 0
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bits.Write(substream->bsmod, 3);
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bits.Write(substream->acmod, 3);
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bits.Write(substream->lfeon, 1);
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bits.Write(0, 3); // reserved
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bits.Write(substream->num_dep_sub, 4);
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if (substream->num_dep_sub > 0) {
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bits.Write(substream->chan_loc, 9);
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}else{
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bits.Write(0, 1); // reserved
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}
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}
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if (complexity_index_type_a) {
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bits.Write(1, 8);
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bits.Write(complexity_index_type_a, 8);
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}
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m_RawBytes.SetData(bits.GetData(), bits.GetBitCount() / 8);
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m_Size32 += m_RawBytes.GetDataSize();
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}
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/*----------------------------------------------------------------------
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| AP4_Dec3Atom::AP4_Dec3Atom
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+---------------------------------------------------------------------*/
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AP4_Dec3Atom::AP4_Dec3Atom(AP4_UI32 size, const AP4_UI08* payload) :
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AP4_Atom(AP4_ATOM_TYPE_DEC3, size),
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m_DataRate(0),
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m_FlagEC3ExtensionTypeA(0),
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m_ComplexityIndexTypeA(0)
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{
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// make a copy of our configuration bytes
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unsigned int payload_size = size-AP4_ATOM_HEADER_SIZE;
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m_RawBytes.SetData(payload, payload_size);
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// sanity check
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if (payload_size < 2) return;
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// parse the payload
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m_DataRate = (payload[0]<<5)|(payload[1]>>3);
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unsigned int substream_count = 1+(payload[1]&7);
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payload += 2;
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payload_size -= 2;
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m_SubStreams.SetItemCount(substream_count);
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for (unsigned int i=0; i<substream_count; i++) {
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if (payload_size < 3) {
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m_SubStreams[i].fscod = 0;
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m_SubStreams[i].bsid = 0;
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m_SubStreams[i].bsmod = 0;
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m_SubStreams[i].acmod = 0;
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m_SubStreams[i].lfeon = 0;
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m_SubStreams[i].num_dep_sub = 0;
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m_SubStreams[i].chan_loc = 0;
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continue;
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}
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m_SubStreams[i].fscod = (payload[0]>>6) & 0x3;
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m_SubStreams[i].bsid = (payload[0]>>1) & 0x1F;
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m_SubStreams[i].bsmod = (payload[0]<<4 | payload[1]>>4) & 0x1F;
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m_SubStreams[i].acmod = (payload[1]>>1) & 0x7;
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m_SubStreams[i].lfeon = (payload[1] ) & 0x1;
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m_SubStreams[i].num_dep_sub = (payload[2]>>1) & 0xF;
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if (m_SubStreams[i].num_dep_sub) {
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m_SubStreams[i].chan_loc = (payload[2]<<7 | payload[3]) & 0x1F;
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payload += 4;
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payload_size -= 4;
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} else {
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m_SubStreams[i].chan_loc = 0;
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payload += 3;
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payload_size -= 3;
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}
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}
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// DD+/Atmos
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if (payload_size >= 2) {
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m_FlagEC3ExtensionTypeA = payload[0] & 0x1;
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m_ComplexityIndexTypeA = payload[1];
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payload += 2;
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payload_size -= 2;
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}
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}
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/*----------------------------------------------------------------------
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| AP4_Dec3Atom::WriteFields
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+---------------------------------------------------------------------*/
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AP4_Result
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AP4_Dec3Atom::WriteFields(AP4_ByteStream& stream)
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{
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return stream.Write(m_RawBytes.GetData(), m_RawBytes.GetDataSize());
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}
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/*----------------------------------------------------------------------
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| AP4_Dec3Atom::InspectFields
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+---------------------------------------------------------------------*/
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AP4_Result
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AP4_Dec3Atom::InspectFields(AP4_AtomInspector& inspector)
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{
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inspector.AddField("data_rate", m_DataRate);
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inspector.AddField("complexity_index_type_a", m_ComplexityIndexTypeA);
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for (unsigned int i=0; i<m_SubStreams.ItemCount(); i++) {
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char name[16];
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char value[256];
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AP4_FormatString(name, sizeof(name), "[%02d]", i);
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AP4_FormatString(value, sizeof(value),
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"fscod=%d, bsid=%d, bsmod=%d, acmod=%d, lfeon=%d, num_dep_sub=%d, chan_loc=%d",
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m_SubStreams[i].fscod,
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m_SubStreams[i].bsid,
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m_SubStreams[i].bsmod,
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m_SubStreams[i].acmod,
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m_SubStreams[i].lfeon,
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m_SubStreams[i].num_dep_sub,
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m_SubStreams[i].chan_loc);
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inspector.AddField(name, value);
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}
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return AP4_SUCCESS;
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}
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