mirror of
https://github.com/axiomatic-systems/Bento4.git
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131 lines
4.4 KiB
C++
131 lines
4.4 KiB
C++
/*****************************************************************
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| AP4 - Sample Table Interface
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| Copyright 2002-2006 Gilles Boccon-Gibod & Julien Boeuf
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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 "Ap4SampleTable.h"
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#include "Ap4ContainerAtom.h"
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#include "Ap4StsdAtom.h"
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#include "Ap4StszAtom.h"
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#include "Ap4StscAtom.h"
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#include "Ap4StcoAtom.h"
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#include "Ap4Co64Atom.h"
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#include "Ap4SttsAtom.h"
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#include "Ap4Sample.h"
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/*----------------------------------------------------------------------
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| AP4_SampleTable::GenerateStblAtom
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+---------------------------------------------------------------------*/
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AP4_Result
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AP4_SampleTable::GenerateStblAtom(AP4_ContainerAtom*& stbl)
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{
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// create the stbl container
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stbl = new AP4_ContainerAtom(AP4_ATOM_TYPE_STBL);
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// create the stsd atom
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AP4_StsdAtom* stsd = new AP4_StsdAtom(this);
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// create the stsz atom
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AP4_StszAtom* stsz = new AP4_StszAtom();
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// create the stsc atom
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AP4_StscAtom* stsc = new AP4_StscAtom();
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// start chunk table
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AP4_Cardinal samples_in_chunk = 0;
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AP4_Position current_chunk_offset = 0;
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AP4_Size current_chunk_size = 0;
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AP4_Array<AP4_Position> chunk_offsets;
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// process all the samples
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AP4_Cardinal sample_count = GetSampleCount();
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for (AP4_Ordinal i=0; i<sample_count; i++) {
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AP4_Sample sample;
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GetSample(i, sample);
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// add an entry into the stsz atom
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stsz->AddEntry(sample.GetSize());
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// adjust the current chunk info
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current_chunk_size += sample.GetSize();
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// count the sample
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samples_in_chunk++;
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if (samples_in_chunk == 10) {
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// new chunk
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chunk_offsets.Append(current_chunk_offset);
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stsc->AddEntry(1, 10, 1);
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samples_in_chunk = 0;
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// adjust the chunk offset
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current_chunk_offset += current_chunk_size;
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current_chunk_size = 0;
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}
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}
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// process any unfinished chunk
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if (samples_in_chunk != 0) {
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// new chunk
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chunk_offsets.Append(current_chunk_offset);
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stsc->AddEntry(1, samples_in_chunk, 1);
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}
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// create the stts atom (for now, we assume sample of equal duration)
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AP4_SttsAtom* stts = new AP4_SttsAtom();
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stts->AddEntry(sample_count, 1000); // FIXME
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// attach the children of stbl
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stbl->AddChild(stsd);
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stbl->AddChild(stsz);
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stbl->AddChild(stsc);
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stbl->AddChild(stts);
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// see if we need a co64 or an stco atom
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AP4_Size chunk_count = chunk_offsets.ItemCount();
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if (current_chunk_offset <= 0xFFFFFFFF) {
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// make an array of 32-bit entries
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AP4_UI32* chunk_offsets_32 = new AP4_UI32[chunk_count];
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for (unsigned int i=0; i<chunk_count; i++) {
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chunk_offsets_32[i] = (AP4_UI32)chunk_offsets[i];
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}
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// create the stco atom
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AP4_StcoAtom* stco = new AP4_StcoAtom(&chunk_offsets_32[0], chunk_count);
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stbl->AddChild(stco);
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delete[] chunk_offsets_32;
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} else {
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// create the co64 atom
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AP4_Co64Atom* co64 = new AP4_Co64Atom(&chunk_offsets[0], chunk_count);
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stbl->AddChild(co64);
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}
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return AP4_SUCCESS;
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}
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